Electrostatic actuator and method of driving the same
Abstract
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Term
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Expired 28 September 2021, 5 years ago.
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16 claims: 4 independent, 12 dependent
- 1移動 方向に沿って配列され、その夫々がこの 移動 方向に交差する方向に 沿って 延出されている第1の固定子電極と、 この第1の固定子電極に対向して配置され、前記 移動 方向に沿って延出される第2の固定子電極と、 前記 第1の固定子電極に対向して配置され、前記第2の固定子電極とは電気的に分離されるように前記移動方向に沿って延出されている第3の固定子電極と、 前記第1の固定子電極と前記第2及び第3の固定子電極との間に規定される空間内を前記移動方向に沿って移動可能に配置され、前記第1の固定子電極に対向 し、前記移動方向に沿って配列され、前記移動方向に交差する方向に沿って延出されている 第1の可動子電極及び前記第2の固定子電極に対向 し、前記移動方向に沿って延出されている 第2の可動子電極を具備する第1の可動子と、 前記移動空間内を前記移動方向に沿って前記第1の可動子とは独立に 移動可能に 配置され、前記第1の固定子電極に対向 し、前記移動方向に沿って配列され、前記移動方向に交差する方向に沿って延出されている 第3の可動子電極及び前記第3の固定子電極に対向 し、前記移動方向に沿って延出されている 第4の可動子電極を具備する第2の可動子と、 から構成されることを特徴とする静電アクチュエータ。
- 2前記第1及び第2の可動子内には、レンズが内蔵されていることを特徴とする請求項1に記載の静電アクチュエータ。
- 3前記第1の固定子電極、第1の可動子電極及び第3の可動子電極は、互いにほぼ並行に且つ等ピッチで配置され、互いに等しい幅を有することを特徴とする請求項1に記載の静電アクチュエータ。
- 4第1の可動子電極及び第3の可動子電極は、互いにほぼ並行に且つ等ピッチで配置され、互いに等しい幅を有することを特徴とする請求項1に記載の静電アクチュエータ。
- 5前記第1の固定子電極は、第1の可動子電極及び第3の可動子電極のピッチの1/4ピッチで配置されていることを特徴とする請求項4に記載の静電アクチュエータ。
- 6前記第2の可動子の前記第4可動子電極が前記固定子の前記第3固定子電極に吸引されて前記第2の可動子が固定された状態で前記移動空間内を前記第1の可動子が移動することが可能であることを特徴とする請求項1に記載の静電アクチュエータ。
- 7第1及び第2の駆動信号を前記第1及び第2の固定子電極に供給して前記第1の可動子を 移動 方向に移動し、保持信号を前記第3の固定子電極に供給して第2の可動子を保持する駆動回路を更に具備することを特徴とする請求項1に記載の静電アクチュエータ。
- 8ある 移動 方向に沿って延びる空間をその内に規定する中空の固定子枠、この固定子枠の第1の内面に配置され、前記 移動 方向に沿って並列され、夫々がこの 移動 方向に交差する方向に 沿って 延出される第1の固定子電極を含む第1の電極領域及び前記固定子枠の第1の内面に対向する第2の内面に配置され、前記 移動 方向に沿って延出され、互いに電気的に分離された第2及び第3の固定子電極を含む第2の電極領域を有する固定子と、 前記固定子内の空間に前記 移動 方向に沿って移動可能に配置され、前記第1の電極領域に対向するように前記第1の固定子電極に対応して前記 移動 方向に沿って並列され、 前記移動方向に交差する方向に沿って延出されている 第1の可動子電極及び前記第2の電極領域に対向するように前記第2の固定子電極に対応して前記 移動 方向に沿って延出される第2の可動子電極を具備する第1の可動子と、 前記空間内を前記移動方向に沿って前記第1の可動子とは独立に 移動可能に 配置され、前記第1の電極領域に対向するように前記第1の固定子電極に対応して前記 移動 方向に沿って並列され、 前記移動方向に交差する方向に沿って延出されている 第3の可動子電極及び前記第2の電極領域に対向するように前記第3の固定子電極に対応して前記 移動 方向に沿って延出される第4の可動子電極を具備する第2の可動子と、 前記第1の固定子電極に第1の駆動信号を供給し、前記第2の固定子電極に第2の駆動信号又は保持電圧信号の一方を供給し、前記第3の固定子電極に第3の駆動信号又は保持電圧信号の一方を供給して第1及び第2の可動子の両方或いは一方を前記 移動 方向に沿って移動させる駆動回路と、を具備することを特徴とする静電アクチュエータ。
- 9前記第1及び第2の可動子内には、レンズが内蔵されている請求項8に記載の静電アクチュエータ。
- 10前記第2の可動子の前記第4可動子電極が前記固定子の前記第3固定子電極に吸引されて前記第2の可動子が固定された状態で前記固定子内を前記第1の可動子が移動することが可能であることを特徴とする請求項8に記載の静電アクチュエータ。
- 11前記第2及び第3の固定子電極は、互いにほぼ並行に前記 移動 方向に沿って延出され、第2及び第4の可動子電極もまた互いにほぼ並行に前記 移動 方向に沿って延出されていることを特徴とする請求項8に記載の静電アクチュエータ。
- 12前記第2及び第3の固定子電極は、前記 移動 方向に沿って広がる面電極であって前記 移動 方向で互いに分離されて配置され、前記第1及び第2の可動子は、第2及び第3の固定子電極が前記 移動 方向に沿って広がる範囲内で可動されることを特徴とする請求項8に記載の静電アクチュエータ。
- 13ある 移動 方向に沿って配列され、そのそれぞれがこの移動方向に交差する方向に 沿って 延出されている第1の固定子電極と、 この第1の固定子電極に対向して配置され、前記 移動 方向に沿って延出される第2の固定子電極と、 前記 第1の固定子電極に対向して配置され、前記第2の固定子電極とは電気的に分離されるように前記 移動 方向に沿って延出されている第3の固定子電極と、 前記第1の固定子電極と前記第2及び第3の固定子電極との間に規定される移動空間内を前記 移動 方向に沿って移動可能に配置され、前記第1の固定子電極に対向 し、前記移動方向に沿って配列され、前記移動方向に交差する方向に沿って延出されている 第1の可動子電極及び前記第2の固定子電極に対向 し、前記移動方向に沿って延出されている 第2の可動子電極を備えた中空の第1の可動子と、 前記移動空間内を前記 移動 方向に沿って前記第1の可動子とは独立に 移動可能に 配置され、前記第1の固定子電極に対向 し、前記移動方向に沿って配列され、前記移動方向に交差する方向に沿って延出されている 第3の可動子電極及び前記第3の固定子電極に対向 し、前記移動方向に沿って延出されている 第4の可動子電極を具備する中空の第2の可動子と、 前記第1の可動子中に前記 移動 方向に沿って配置された光軸を有する第1の光学レンズ系と、 前記第2の可動子中に前記 移動 方向に沿って配置された光軸を有する第2の光学レンズ系であって、第1及び第2のレンズ系の相対位置に従ってその光学倍率が定まり、第1及び第2のレンズ系の位置に従って結像面に被写体像が結像される第2の光学系と、 前記第1の固定子電極に第1の駆動信号を供給し、前記第2の固定子電極に第2の駆動信号又は保持電圧信号の一方を供給し、前記第3の固定子電極に第3の駆動信号又は保持電圧信号の一方を供給して第1及び第2の可動子の両方或いは一方を前記 移動 方向に沿って移動させる駆動回路と、から構成されることを特徴とする被写体像をその結像面に結像させる画像装置。
- 14前記第2及び第3の固定子電極は、互いにほぼ並行に前記 移動 方向に沿って延出され、第2及び第4の可動子電極もまた互いにほぼ並行に前記 移動 方向に沿って延出されていることを特徴とする請求項13の画像装置。
- 15前記第2及び第3の固定子電極は、前記 移動 方向に沿って広がる面電極であって前記 移動 方向で互いに分離されて配置され、前記第1及び第2の可動子は、第2及び第3の固定子電極が前記 移動 方向に沿って広がる範囲内で可動されることを特徴とする請求項13の画像装置。
- 16移動 方向に沿って配列され、その夫々がこの 移動 方向に交差する方向に 沿って 延出されている第1の固定子電極と、 この第1の固定子電極に対向して配置され、前記 移動 方向に沿って延出される第2の固定子電極と、 前記 第1の固定子電極に対向して配置され、前記第2の固定子電極とは電気的に分離されるように前記移動方向に沿って延出されている第3の固定子電極と、 前記第1の固定子電極と前記第2及び第3の固定子電極との間に規定される空間内を前記移動方向に沿って移動可能に配置され、前記第1の固定子電極に対向 し、前記移動方向に沿って配列され、前記移動方向に交差する方向に沿って延出されている 第1の可動子電極及び前記第2の固定子電極に対向 し、前記移動方向に沿って延出されている 第2の可動子電極を具備する第1の可動子と、 前記移動空間内を前記移動方向に沿って前記第1の可動子とは独立に 移動可能に 配置され、前記第1の固定子電極に対向 し、前記移動方向に沿って配列され、前記移動方向に交差する方向に沿って延出されている 第3の可動子電極及び前記第3の固定子電極に対向 し、前記移動方向に沿って延出されている 第4の可動子電極を具備する第2の可動子と、 から構成される静電アクチュエータを駆動する方法において、 第1の駆動信号を前記第1の固定子電極に供給し、 第2の駆動信号を前記第2の固定子電極に供給し、 第1の保持信号を前記第2の固定子電極に供給し、 第3の駆動信号及び第2の保持信号の一方を前記第3の固定子電極に供給して前記第1及び第2の可動子の一方或いは両方を前記 移動方向に沿って 移動させることを特徴とする静電アクチュエータの駆動方法。
Independent claims16
228 paragraphs, as filed
The present invention relates to an electrostatic actuator for driving a mover by an electrostatic force and a method for driving the same, and in particular, an electrostatic actuator having a mover that can be individually driven and a method for driving the same. Regarding.
[0002] Conventional Technology Since an electrostatic actuator is small and lightweight, it is used for focusing a lens system mounted on a mobile phone such as an endoscope or a mobile phone, or a device such as various PDAs. Is possible and has been attracting attention recently.
[0003] FIG. 1 is a perspective view showing a conventional electrostatic actuator, and the electrostatic actuator 100 includes a mover 101 and a stator 102. The mover 101 is formed in a substantially rectangular parallelepiped having a hollow portion, and the stator 102 is formed in a substantially rectangular parallelepiped having a through hole extending in the longitudinal direction. The mover 101 is slidably inserted into the through hole of the stator 102, and the mover 101 is movably arranged in the stator 102 in the longitudinal direction thereof. A gap of about several microns is provided between the stator 102 and the mover 101.
[0004] Further, the mover 101 has a pair of electrode surfaces in which the convex stripe electrodes 103A-103B are formed by etching or the like and face the inner surface of the stator 102. A plurality of lenses 104 having an optical axis along the through-hole direction are arranged and fixed in the hollow portion of the mover 101, and the lens is focused on the subject by moving the mover 101.
[0005] Note that a wiring 105 for applying a drive signal is connected to the mover 101.
[0006] Further, in the stator 102, glass plates 106A and 106B are mounted on the surfaces facing the electrodes 103A-103B, and the surfaces of the glass plates 106A and 106B are patterned with a conductive material to form the first group GA and Electrodes 107A of the second group GB and electrodes 107B of the third group GC and the fourth group GD are formed. The electrodes 107A of the first group GA and the second group GB are arranged alternately at the same pitch, and similarly, the third group GC and the fourth group GD107B are also arranged alternately at the same pitch. Further, the electrodes 107A and 107B are arranged so as to be offset by half a pitch from each other.
[0007] The operation of the electrostatic actuator having such a structure will be described with reference to FIG.
(1) First, a voltage of + V [V] is applied to the first group GA of the electrode 107A. Therefore, an electrostatic force, that is, an attractive force is generated between the electrode 107A and the electrode 103A of the first group GA. The mover 101 starts moving toward the glass plate 106A of the stator 102 by this electrostatic force, and after a certain period of time, the electrode 103A is attracted to the electrode 107A of the first group GA.
(2) Next, a voltage of + V [V] is applied to the electrode 107B of the third group GC among the electrodes 107B. Therefore, an electrostatic force is generated between the electrode 107B and the electrode 103B of the third group GC. Due to this electrostatic force, the mover 101 starts moving toward the glass plate 106B of the stator 102, and after a certain period of time, the electrode 103B is attracted to the electrode 107B of the third group GC. The mover 101 is moved to the right in FIG. 2 by half the arrangement pitch of the electrodes 107A or 107B as compared with the position described in (1).
(3) Further, a voltage of + V [V] is applied to the second group GB of the electrode 107A. Therefore, an electrostatic force is generated between the electrode 107A and the electrode 103A of the second group GB. Due to this electrostatic force, the mover 101 starts moving to the glass plate 106A side again, and after a certain period of time, the electrode 103A is attracted to the electrode 107A of the second group GB. The mover 101 is moved to the right in FIG. 2 by the arrangement pitch of the electrodes 106A or 106B as compared with the position described in.
(4) Furthermore, a voltage of + V [V] is applied to the electrode 107A of the fourth group GD of the electrode 107B. An electrostatic force is generated between the electrode 107A and the electrode 103B of the fourth group GD. Therefore, the mover 101 starts moving to the glass plate 106B side again due to this electrostatic force, and after a certain period of time, the electrode 103B is attracted to the electrode 107B of the fourth group GD. The mover 101 is moved to the right in FIG. 2 by 1.5 times the arrangement pitch of the electrodes 107A or 107B as compared with the position described in (1).
[0012] By repeating the steps (1) to (4) above, the mover 101 can be moved to the right in FIG. 2 in units of 1/2 array pitch.
[0013] Further, when a voltage is applied to each electrode in the order of the steps (4), (3), (2), and (1), the mover 101 is arranged in a 1/2 array pitch to the left in FIG. It can be moved in units.
[0014] The mover 101 can be moved by the steps (1) to (4), and the lens 104 mounted on the mover 101 can be moved to focus on the subject.
[0015] As described above, in the conventional electrostatic actuator, it is possible to move the mover to a desired position to focus on the subject and take an image, but the image is captured. There is a problem that the zooming function for enlarging or reducing the image cannot be realized. This is based on the fact that the lens system is moved by a single mover.
[0016] Further, even if the conventional electrostatic actuator is provided with a plurality of movers for enlarging or reducing the image, the plurality of movers move independently or independently for the purpose of enlarging or reducing the image. Must be fixed. However, in the electrostatic actuator having the conventional structure, there is a problem that a plurality of movers cannot be independently moved or fixed in the stator to operate.
[Means for Solving the Problems] An object of the present invention is to provide an electrostatic actuator capable of operating a plurality of movers for enlarging or reducing an image to be imaged independently of each other. To provide.
[0018] According to the present invention.<u style="single">Move</u>Arranged along the direction, each of which is this<u style="single">Move</u>In the direction that intersects the direction<u style="single">Along</u>The extending first stator electrode and the first stator electrode are arranged so as to face the first stator electrode.<u style="single">Move</u>A second stator electrode that extends along the direction,<u style="single">Said</u>A third stator electrode, which is arranged to face the first stator electrode and extends along the moving direction so as to be electrically separated from the second stator electrode, and the above-mentioned It is movably arranged along the moving direction in the space defined between the first stator electrode and the second and third stator electrodes, and faces the first stator electrode.<u style="single">Then, they are arranged along the moving direction and extend along the direction intersecting the moving direction.</u>Facing the first mover electrode and the second stator electrode<u style="single">And it extends along the moving direction</u>The first mover provided with the second mover electrode and the first mover in the moving space along the moving direction are independent of each other.<u style="single">Movable</u>Arranged and opposed to the first stator electrode<u style="single">Then, they are arranged along the moving direction and extend along the direction intersecting the moving direction.</u>Facing the third mover electrode and the third stator electrode<u style="single">And it extends along the moving direction</u>An electrostatic actuator comprising a second mover comprising a fourth mover electrode and a fourth mover electrode is provided.
[0019] Further, according to the present invention, there is<u style="single">Move</u>A hollow stator frame that defines a space extending along the direction within it, which is arranged on the first inner surface of the stator frame and described above.<u style="single">Move</u>Parallel along the direction, each is this<u style="single">Move</u>In the direction that intersects the direction<u style="single">Along</u>The first electrode region including the extending first stator electrode and the second inner surface facing the first inner surface of the stator frame are arranged and said.<u style="single">Move</u>A stator having a second electrode region extending along the direction and including a second and third stator electrodes electrically separated from each other, and the space within the stator.<u style="single">Move</u>The said, corresponding to the first stator electrode, which is movably arranged along the direction and faces the first electrode region.<u style="single">Move</u>Parallel along the direction,<u style="single">It extends along a direction that intersects the moving direction.</u>Corresponding to the second stator electrode so as to face the first mover electrode and the second electrode region.<u style="single">Move</u>A first mover having a second mover electrode extending along a direction and an independent first mover along the moving direction in the space.<u style="single">Movable</u>The said, corresponding to the first stator electrode, arranged so as to face the first electrode region.<u style="single">Move</u>Parallel along the direction,<u style="single">It extends along a direction that intersects the moving direction.</u>Corresponding to the third stator electrode so as to face the third mover electrode and the second electrode region.<u style="single">Move</u>A first drive signal is supplied to a second mover having a fourth mover electrode extending along a direction and the first stator electrode, and a second drive signal is supplied to the second stator electrode. One of the drive signal and the holding voltage signal of the above is supplied, and one of the third drive signal and the holding voltage signal is supplied to the third stator electrode to supply both or one of the first and second movers.<u style="single">Move</u>An electrostatic actuator is provided that comprises a drive circuit that moves along a direction.
[0020] Further, according to the present invention, there is<u style="single">Move</u>Arranged along the direction, each intersecting this direction of movement<u style="single">Along</u>The extending first stator electrode and the first stator electrode are arranged so as to face the first stator electrode.<u style="single">Move</u>A second stator electrode that extends along the direction,<u style="single">Said</u>The stator is arranged so as to face the first stator electrode and is electrically separated from the second stator electrode.<u style="single">Move</u>The movement space defined between the third stator electrode extending along the direction and the first stator electrode and the second and third stator electrodes is described above.<u style="single">Move</u>It is movably arranged along the direction and faces the first stator electrode.<u style="single">Then, they are arranged along the moving direction and extend along the direction intersecting the moving direction.</u>Facing the first mover electrode and the second stator electrode<u style="single">And it extends along the moving direction</u>The hollow first mover provided with the second mover electrode and the moving space are described.<u style="single">Move</u>Independent of the first mover along the direction<u style="single">Movable</u>Arranged and opposed to the first stator electrode<u style="single">Then, they are arranged along the moving direction and extend along the direction intersecting the moving direction.</u>Facing the third mover electrode and the third stator electrode<u style="single">And it extends along the moving direction</u>A hollow second mover having a fourth mover electrode and the said in the first mover.<u style="single">Move</u>The first optical lens system having an optical axis arranged along the direction and the said in the second mover.<u style="single">Move</u>A second optical lens system having an optical axis arranged along the direction, the optical magnification of which is determined according to the relative positions of the first and second lens systems, and according to the positions of the first and second lens systems. A first drive signal is supplied to the second optical system in which a subject image is formed on the image forming surface and the first stator electrode, and the second drive signal or holding is supplied to the second stator electrode. One of the voltage signals is supplied, and one of the third drive signal or the holding voltage signal is supplied to the third stator electrode to supply both or one of the first and second movers.<u style="single">Move</u>Provided is an image device that forms an image of a subject image, which is characterized by being composed of a drive circuit that moves along a direction, on an image forming surface thereof.
[0021] Furthermore, according to the present invention,<u style="single">Move</u>Arranged along the direction, each of which is this<u style="single">Move</u>In the direction that intersects the direction<u style="single">Along</u>The extending first stator electrode and the first stator electrode are arranged so as to face the first stator electrode.<u style="single">Move</u>A second stator electrode that extends along the direction,<u style="single">Said</u>A third stator electrode, which is arranged to face the first stator electrode and extends along the moving direction so as to be electrically separated from the second stator electrode, and the above-mentioned It is movably arranged along the moving direction in the space defined between the first stator electrode and the second and third stator electrodes, and faces the first stator electrode.<u style="single">Then, they are arranged along the moving direction and extend along the direction intersecting the moving direction.</u>Facing the first mover electrode and the second stator electrode<u style="single">And it extends along the moving direction</u>The first mover provided with the second mover electrode and the first mover in the moving space along the moving direction are independent of each other.<u style="single">Movable</u>Arranged and opposed to the first stator electrode<u style="single">Then, they are arranged along the moving direction and extend along the direction intersecting the moving direction.</u>Facing the third mover electrode and the third stator electrode<u style="single">And it extends along the moving direction</u>In a method of driving an electrostatic actuator composed of a second mover provided with a fourth mover electrode, a first drive signal is supplied to the first stator electrode to drive the second mover. A signal is supplied to the second stator electrode, a first holding signal is supplied to the second stator electrode, and one of the third drive signal and the second holding signal is supplied to the third stator. One or both of the first and second movers are supplied to the electrodes.<u style="single">Along the direction of movement</u>A method of driving an electrostatic actuator, characterized in that it is moved, is provided.
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the electrostatic actuator of the present invention will be described with reference to the drawings.
[0023] Since the electrostatic actuator is small and lightweight, it can be used for focusing a lens mounted on a mobile phone such as an endoscope or a mobile phone, various PDAs, and the like, and has recently attracted attention. ..
[0024] FIGS. 3 (a) to 3 (c) show the electrostatic actuator according to the first embodiment.
FIG. 3A is a perspective view schematically showing an electrostatic actuator according to the first embodiment. The electrostatic actuator 1 shown in FIG. 3 (a) has first and second movers 2A and 2B having a pair of mover electrodes 4,8,5,11 on the upper surface and the lower surface thereof, and the mover. With a stator 3 having a pair of stator electrode portions 12, 14 (in the following description, reference numeral 14 is referred to as a holding electrode portion) arranged to face the child electrodes 4, 8, 5, 11. Consists of.
[0026] The mover electrodes 4,8,5,11 are composed of a drive electrode 4,8 for driving the mover and a fixing electrode 5,11 for fixing the movers 2A, 2B. Similarly, the stator electrode portions 12 and 14 are composed of a driving electrode portion 12 for driving the mover and a holding electrode portion 14 for holding the movers 2A and 2B at the positions.
[0027] First, the structure of the stator 3 will be described.
[0028] The stator 3 is composed of a stator frame 3A which is a hollow cube-shaped frame having a penetrating portion. The stator frame 3A is formed on one inner surface of the stator frame 3A having the upper inner surface 3A-1, the lower inner surface 3A-2 and the side inner surfaces 3A-3,3A-4, for example, the upper surface 3A-1. Is formed with a driving electrode portion 12 for driving the stators 2A and 2B. Further, on another inner surface facing the upper surface, for example, the lower surface 3A-2, a holding electrode portion 14 for holding the movers 2A and 2B at that position is formed.
[0029] As shown in FIG. 3B, the driving electrode portion 12 is formed by patterning on the surface of the glass plate 13 in a desired shape, and intersects a predetermined direction, for example, the longitudinal direction of the stator 3. A plurality of electrodes extending in the direction of glass, that is, in the lateral direction, are arranged in parallel. The glass plate 13 having the driving electrode portion 12 is fitted to the inner surface 3A-1 of the stator 3. Further, the width of one electrode 12A to 12D of the driving electrode portion 12 is about 20 microns. The distance between the electrodes 12A to 12D of the driving electrode portion 12 is about 20 microns, and the electrodes 12A to 12D are arranged at a pitch of approximately 40 microns.
[0030] A holding electrode portion 14 is formed on the inner surface 3A-2 of the stator frame 3A facing the driving electrode portion 12. The holding electrode portion 14 is formed on the surface of the glass plate 15 in a predetermined direction by patterning into a desired shape. The glass plate 15 on which the holding electrode portion 14 is formed is fitted to the surface 3A-2 of the inner wall of the stator 3. The holding electrode portion 14 has five electrodes corresponding to the three mover-side fixed electrodes 5 of the first mover 2A and the two mover-side fixed electrodes 11 of the second mover 2B, which will be described later. Are formed in parallel. As shown in FIG. 3 (c), the five holding electrode portions 14 are arranged side by side in most regions including the central region on the glass plate 15, and one of the five holding electrode portions 14 in the longitudinal direction on the glass plate 15 is arranged side by side. In the side region, the three holding electrode portions 14A corresponding to the mover side fixed electrode 5 are electrically connected at the end of the glass plate 15, and the two holding electrode portions 14A corresponding to the mover side fixed electrode 11 are electrically connected. The holding electrode portions 14B are electrically connected to each other in the other side region in the longitudinal direction on the glass plate 15. In this way, the holding electrode portions 14A and 14B are electrically and independently arranged so as to independently control the first and second movers 2A and 2B.
[0031] Further, the side surfaces of the first and second movers 2A and 2B are in direct contact with the inner surfaces 3A-3 and 3A-4 on the lateral inner surfaces 3A-3 and 3A-4 of the stator frame 3A. A stopper 16 for preventing the above is extended in the longitudinal direction so as to project inside the stopper 16. Similarly, stoppers 16 are provided on the inner surfaces 3A-1 and 3A-2 so that the movers 2A and 2B and the drive electrode portions 12 and 14 do not come into direct contact with each other.
Next, the structures of the two movers 2A and 2B will be described in detail.
[0033] The first and second movers 2A and 2B include a substantially rectangular parallelepiped support formed of a conductive material having a hollow portion, and electrodes 4, 5, 8 and 11 formed on the surface thereof. It is composed of lenses 6 and 9 arranged in the hollow portion and wirings 7 and 10 for removing electric charges from the support. The support and the electrodes 4 and 5 may be integrally formed.
[0034] The first mover 2A and the second mover 2B are inserted into the through hole so as to be separated from each other and movable in a predetermined direction.
[0035] A first mover 2A facing the stator-side drive electrode portion 12 is provided with a mover-side drive electrode 4 on the surface, for example, the upper surface thereof, and faces the holding electrode portion 14. A mover-side fixed electrode 5 is provided on the surface of the mover 2A, for example, the lower surface of the mover 2A. The mover side drive electrode 4 has a plurality of protrusion-shaped stripes extended by etching so as to intersect in the longitudinal direction, that is, in the moving direction, and is arranged in parallel in the longitudinal direction. Further, the movable element side fixed electrode 5 is extended in this moving direction, and a plurality of protrusion-shaped stripes are formed by etching so as to be parallel to each other in the lateral direction. The mover side drive electrode 4 is formed in an uneven shape, the interval between the electrodes 4 is about 20 microns, and the height of the convex portion is about 10 microns from the surface inside the concave portion. That is, the convex end face of the mover side drive electrode 4 is equal to the width of one electrode 12A to 12D of the drive electrode portion 12, and the concave bottom surface of the mover side drive electrode 4 is this electrode 12A. It has a width equal to the interval between ~ 12D, and the concave or convex of the mover side drive electrode 4 is arranged at a pitch of about 40 microns.
[0036] In the actuator shown in FIG. 3A, the first mover 2A is provided with three fixed electrodes 5 extending in the longitudinal direction and juxtaposed in the lateral direction. Further, a plurality of lenses 6 having their optical axes aligned are fixed in the hollow portion of the first mover 2A.
[0037] The second mover 2B is provided with a mover-side drive electrode 8 having the same shape and dimensions as the mover-side drive electrode 4 of the first mover 2A. Further, in the mover 2B, the lens 9 is fixed in the same manner as the lens 6. By changing the arrangement of the lenses 6 and 9, the lens system composed of both is zoomed between wide and tele, and the subject is focused according to the zoomed focal length. The second mover 2B is provided with two fixed electrodes 11 which are similarly extended in the longitudinal direction and arranged side by side in the lateral direction. The fixed electrode 11 is formed by etching.
[0038] As is clear from the above, the movable element side drive electrodes 4 and 8 are provided with substantially parallel irregularities, and the movable element side fixed electrodes 5 and 11 are also provided with substantially parallel irregularities. .. The mover side drive electrodes 4 and 8 and the mover side fixed electrodes 5 and 11 are in a relationship in which their extension directions intersect with each other, and the mover side fixed electrodes 5 and 11 extend in the longitudinal direction thereof. They are put out, and in the horizontal direction, they are arranged side by side so that they do not overlap each other.
[0039] Such first and second movers 2A and 2B are arranged in the moving direction, that is, in the longitudinal direction, and can move independently of each other.
[0040] The operation of the actuator having such a structure will be described with reference to FIG. 4 (a).
FIG. 4A is a cross-sectional view showing a state in which the first and second movers 2A and 2B are inserted into the stator frame 3A, and FIG. 4B is a cross-sectional view showing a state in which the first and second movers 2A and 2B are inserted into the stator frame 3A. It is a cross-sectional view of a) cut along the line XX and viewed from the direction of the arrow, and FIG. 4 (c) is a cross-sectional view of FIG. 4 (a) cut along the line YY and viewed from the direction of the arrow.
As shown in FIG. 4A, the drive electrode portion 12 is composed of a plurality of electrode groups in which each group arranged along the moving direction is composed of four-phase electrodes 12A to 12D. The drive electrodes 12A to 12D are connected to the control unit 19 and are driven by inputting a control voltage signal from the control unit 19. That is, a plurality of groups of drive electrodes 12A to 12D are arranged in the longitudinal direction, and one drive electrode 12A to 12D is commonly connected to the corresponding drive electrodes 12A to 12D of each other group to the control unit 19. Connected, the voltage signal is applied independently to the drive electrodes 12A-12D of each group. For example, when a voltage is applied to the drive electrode 12A, a voltage signal is applied to the convex portions corresponding to the drive electrodes 12A of all groups of the electrode portion 12.
As shown in FIG. 4D, the width Wm of the stator electrode 5 or 11 of the stator 2A or 2B and the width Ws of the stator electrode 14 of the stator 3 are such that the stator 2A or 2B is the stator 3 Even if it moves in the horizontal direction within the frame of, it is required to be set larger than the movement length (ΔL). This movement length ΔL is the width (Lm) of the mover 2A or 2B and the stator 5 or 11 when the mover 2A or 2B is in contact with the stopper 16 provided on one side of the stator 5 or 11. It corresponds to the difference in distance (Ls) between the stoppers provided on one side surface. The reason why the widths Wm and Ws are set larger than the moving length (ΔL) is that when the mover moves in the lateral direction by ΔL, the opposing electrodes 5 and 14 may come off, and when the overlapping area becomes extremely small. This is because the force for fixing the mover 2A cannot be generated.
[0044] Further, the space between the electrodes 5, 11 or 14 must also be wider than ΔL, and as the number of fixed electrodes increases, the portion without electrodes also increases, in order to generate an attractive force. Is a disadvantageous condition.
[0045] Further, when each of the movers 2A and 2B is one electrode, if these are provided on the left or right of the central region, each of the movers 2A and 2B is symmetrical with respect to the traveling direction. Cannot be installed in. As a result, the movers 2A and 2B may be moved unstable during driving, and each of the movers 2A and 2B needs to be provided with at least two electrodes.
Therefore, in a small actuator, for example, in a structure having two stator electrodes as stator electrodes, two electrodes are provided on one of the movers 2A and 2B, and the other movers 2A and 2B. Is preferably a combination in which three electrodes are provided, or a combination in which one mover 2A and 2B is provided with three electrodes and the other movers 2A and 2B are provided with four electrodes.
[0047] Here, the operations of the first and second movers 2A and 2B have the following four operation modes, and each operation mode will be described.
[0048] 1 When both the first and second movers 2A and 2B are moved to the right in FIG. 4A. (Hereinafter, it is simply referred to as an operation mode 1 .) This operation corresponds to a focusing mode in which the focus of the lens system is focused on the subject.
2 When both the first and second movers 2A and 2B are moved to the left in FIG. 4A. (Hereinafter, it is simply referred to as operation mode 2 .) This operation corresponds to the focusing mode in which the focus of the lens system is similarly focused on the subject.
[0050] 3 When the first mover 2A is fixed and only the second mover 2B is moved to the left or right in FIG. 4 (a). (Hereinafter, it is simply referred to as operation mode 3 .) This operation corresponds to a zooming mode in which the lens system is switched to the telephoto or wide side.
4 When the second mover 2B is fixed and only the first mover 2A is moved to the left or right in FIG. 4 (a). (Hereinafter, it is simply referred to as operation mode 4 .) This operation corresponds to a zooming mode in which the lens system is switched to the telephoto or wide side.
The four operation modes described above will be described below.
[0053] 1 The operation mode 1 for moving both the first and second movers 2A and 2B to the right in FIG. 4A is realized in the following order.
(1) First, the driving electrodes 4 and 8 of the movers 2A and 2B are maintained in contact with the ground. In this state, a voltage H is applied to the drive electrode 12A as shown in FIG. 5 (a). The mover-side drive electrodes 4 and 8 in the vicinity of the drive electrode 12A are attracted to the drive electrode 12A by an electrostatic force, and the mover-side drive electrodes 4 and 8 are attracted to the drive electrode 12A. Therefore, the first and second movers 2A and 2B are moved to the glass plate 13 side.
(2) Next, at time point t1, the voltage of the driving electrode 12A is changed to a low level L, and as shown in FIGS. 5 (e) and 5 (f), the voltage is applied to the holding electrodes 14A and 14B. H is applied. Therefore, a strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, and the first mover 2A is moved to the glass plate 15 side and held by the mover side fixed electrode 5. It is adsorbed on the electrode portion 14A. Further, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is used for holding. It is adsorbed on the electrode portion 14B.
(3) Next, the voltage of the holding electrodes 14A and 14B is changed to a low level L at the time point t2, and the voltage H is applied to the driving electrode 12B as shown in FIG. 5 (b). .. The mover-side drive electrodes 4 and 8 in the vicinity of the drive electrode 12B are attracted to the drive electrode 12B by an electrostatic force, and the mover-side drive electrodes 4 and 8 are attracted to the drive electrode 12B. Therefore, the first and second movers 2A and 2B are moved to the glass plate 13 side. At this time, as compared with the case of (1), it is moved to the right of FIG. 4 (a) by one stripe of the driving electrode portion 12, that is, by one pitch.
(4) Next, the voltage of the driving electrode 12B is changed to a low level L at the time point t3, and the voltage H is applied to the holding electrodes 14A and 14B again as shown in FIGS. 5E and 5F. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is a holding electrode. Adsorbed to part 14A. Further, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is used for holding. It is adsorbed on the electrode portion 14B.
(5) Further, at the time point t4, the voltages of the holding electrode portions 14A and 14B are changed to a low level L, and a voltage is applied to the driving electrode 12C as shown in FIG. 5 (c). The mover side drive electrodes 4 and 8 in the vicinity of the drive electrode 12C are attracted to the drive electrode 12C by an electrostatic force, and the mover side drive electrodes 4 and 8 are attracted to the drive electrode 12C. The first and second movers 2A and 2B are moved to the glass plate 13 side. At this time, as compared with the case of (1), the drive electrode portion 12 is moved to the right by two stripes, that is, two pitches, in the right direction of FIG. 4 (a).
(6) Next, at the time point t5, the voltage of the driving electrode 12C is changed to a low level L, and as shown in FIGS. 5 (e) and 5 (f), the holding electrodes 14A and 14B are displayed again. A voltage is applied. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode. Adsorbed to part 14A. Further, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is moved to the glass plate 15. It is adsorbed on the holding electrode portion 14B.
(7) Next, at time point t6, the voltages of the holding electrodes 14A and 14B are changed to a low level L, and a voltage is applied to the driving electrodes 12D as shown in FIG. 5 (d). The mover-side drive electrodes 4 and 8 in the vicinity of the drive electrode 12D are attracted to the drive electrode 12D by an electrostatic force, and the mover-side drive electrodes 4 and 8 are attracted to the drive electrode 12D. The first and second movers 2A and 2B are moved to the glass plate 13 side. At this time, as compared with the case of (1), the drive electrode portion 12 is moved to the right by three stripes, that is, three pitches, in the right direction of FIG. 4 (a).
(8) Next, at time point t7, the voltage of the driving electrode 12D is changed to a low level L, and as shown in FIGS. 5 (e) and 5 (f), the holding electrodes 14A and 14B are again displayed. A voltage is applied. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode. Adsorbed to part 14A. Further, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is held. It is adsorbed on the electrode portion 14B.
(9) Next, at time point t8, the voltages of the holding electrodes 14A and 14B are changed to a low level L, and the voltage is applied to the driving electrodes 12A again as shown in FIG. 5 (a). .. The mover-side drive electrodes 4 and 8 in the vicinity of the drive electrode 12A are attracted to the drive electrode 12A by an electrostatic force, and the mover-side drive electrodes 4 and 8 are attracted to the drive electrode 12A. The first and second movers 2A and 2B are moved to the glass plate 13 side. At this time, as compared with the case of (1), the drive electrode portion 12 is moved to the right by four pitches by four stripes in FIG. 4 (a).
[0063] The above steps (1) to (9) are repeated for the distances at which the first and second movers 2A and 2B are desired to be moved.
[0064] 2 When moving both the first and second movers 2A and 2B to the left in Fig. 4 (a).
[0065] By reversing the steps of (1) and (1) above, the first and second movers 2A and 2B can be moved to the left. That is, in the above-mentioned mode of 1 , move in the order of (9), (8), (7), (6), (5), (4), (3), (2), (1). Each step may be repeated for a desired distance to move the first and second movers 2A and 2B.
[0066] Here, the modes (1) and (2) are both focusing mode operations that focus on the subject, and in either direction depending on the initial positions of the first and second movers 2A and 2B. It is appropriately selected depending on whether it is possible to focus in a short time by moving it.
[0067] 3 When the first mover 2A is fixed and only the second mover 2B is moved to the left or right in FIG. 4 (a).
[0068] Hereinafter, a case where the second mover 2B is moved to the right will be described.
(1) First, the driving electrodes 4 and 8 of the movers 2A and 2B are maintained in the ground as in the mode of 1 . As shown in FIG. 6 (f), a voltage is applied to the holding electrode portion 14B. An electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 5, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode. Adsorbed to part 14B. When a voltage is applied to the holding electrode portion 14A as shown in FIG. 6 (e), the first mover 2A is attracted to the glass plate 15 and temporarily fixed.
(2) Next, as shown in FIG. 6 (e), while the voltage H is applied to the holding electrode portion 14A, the voltage H is applied to the driving electrode 12A at the time point t1 as shown in FIG. 6 (a). Is applied. The mover-side drive electrode 8 in the vicinity of the drive electrode 12A is attracted to the drive electrode 12A by an electrostatic force, and the mover-side drive electrode 8 is attracted to the drive electrode 12A. Therefore, the second mover 2B is moved to the glass plate 13 side. On the other hand, since the voltage H is applied to the holding electrode portion 14A, the first mover 2A is maintained fixed to the glass plate 15 side.
(3) Next, with the voltage applied to the holding electrode portion 14A, the voltage H is applied to the holding electrode portion 14B at the time point t2 as shown in FIG. 6 (f). Therefore, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is held. It is adsorbed on the electrode portion 14B.
(4) Next, the voltage H is applied to the drive electrode 12B at the time point t3 as shown in FIG. 6 (b) while the voltage is still applied to the holding electrode portion 14A. The mover-side drive electrode 8 in the vicinity of the drive electrode 12B is attracted to the drive electrode 12B by an electrostatic force, and the mover-side drive electrode 8 is attracted to the drive electrode 12B. Therefore, the second mover 2B is moved to the glass plate 13 side. The first mover 2A is similarly held fixed to the glass plate 15 side. At this time, the second mover 2B is moved to the right in FIG. 4A by one stripe of the driving electrode portion 12, that is, by one pitch as compared with the case of (1).
(5) Next, the voltage H is applied to the holding electrode portion 14B at the time point t4 as shown in FIG. 6 (f) while the voltage is still applied to the holding electrode portion 14A. A strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is the holding electrode portion. Adsorbed on 14B.
(6) Next, as shown in FIG. 6 (c), the voltage is applied to the drive electrode 12C at the time point t5 while the voltage is still applied to the holding electrode portion 14A. The mover-side drive electrode 8 in the vicinity of the drive electrode 12C is attracted to the drive electrode 12C by an electrostatic force, and the mover-side drive electrode 8 is attracted to the drive electrode 12C. Therefore, the second mover 2B is moved to the glass plate 13 side. The first mover 2A is still fixed to the glass plate 15 side. At this time, the second mover 2B is moved to the right in FIG. 4A by the two stripes of the driving electrode portion 12, that is, by two pitches, as compared with the case of (1).
(7) Next, the voltage H is applied to the holding electrode portion 14B at the time point t6 as shown in FIG. 6 (f) while the voltage is still applied to the holding electrode portion 14A. A strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is used for holding. It is adsorbed on the electrode portion 14B.
(8) Next, a voltage is applied to the drive electrode 12D at the time point t7 as shown in FIG. 6 (d) while the voltage is still applied to the holding electrode portion 14A. The mover-side drive electrode 8 in the vicinity of the drive electrode 12D is attracted to the drive electrode 12D by an electrostatic force, and the mover-side drive electrode 8 is brought close to the drive electrode 12D. The second mover 2B is moved to the glass plate 13 side. The first mover 2A remains fixed to the glass plate 15 side. At this time, the second mover 2B is moved to the right of FIG. 4A by the three stripes of the driving electrode portion 12, that is, by three pitches, as compared with the case of (1).
(9) Next, as shown in FIG. 6 (f), the voltage is applied to the holding electrode portion 14B at the time point t8 while the voltage is still applied to the holding electrode portion 14A. A strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is used for holding. It is adsorbed on the electrode portion 14B.
(10) Next, as shown in FIG. 6A, the voltage is applied to the driving electrode 12A at the time point t9 while the voltage is still applied to the holding electrode portion 14A. The mover-side drive electrode 8 in the vicinity of the drive electrode 12A is attracted to the drive electrode 12A by an electrostatic force, and the mover-side drive electrode 8 is attracted to the drive electrode 12A. The second mover 2B is moved to the glass plate 13 side. The first mover 2A is similarly held fixed to the glass plate 15 side. At this time, the second mover 2B is moved to the right in FIG. 4 (a) by four stripes of the drive electrode portion 12 and four pitches as compared with the case of (1).
[0079] The steps (1) to (10) as described above are repeated for the desired distance to move the second mover 2B, and the mover 2B is moved.
[0080] If the mover 2B is to be moved to the right, (1), (10), (9), (8), (7), (6), (in the above-mentioned 3 The second mover 2B can be moved by repeating the movement in the order of 5), (4), (3), and (2) for the desired distance.
[0081] 4 When the second mover 2B is fixed and only the first mover 2A is moved to the left or right in FIG. 4 (a).
[0082] Hereinafter, a case where the first mover 2A is moved to the right will be described.
(1) First, the drive electrodes 4 and 8 of the movers 2A and 2B are maintained in a grounded state in the same manner as in the operation mode of 1 . As shown in FIG. 7 (e), a voltage is applied to the holding electrode portion 14A. An electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 11, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode portion. Adsorbed to 14A. Here, when a voltage is applied to the holding electrode portion 14B as shown in FIG. 7 (f), the second mover 2B is attracted to the glass plate 15 and is maintained in a fixed state. ..
(2) Next, as shown in FIG. 7 (f), the voltage H is still applied to the holding electrode portion 14B, and as shown in FIG. 7 (a), the voltage is applied to the driving electrode 12A at the time point t1. H is applied. Therefore, the mover-side drive electrode 4 in the vicinity of the drive electrode 12A is attracted to the drive electrode 12A by an electrostatic force, and the mover-side drive electrode 4 is attracted to the drive electrode 12A. As a result, the first mover 2A is moved to the glass plate 13 side. On the other hand, since the voltage H is applied to the holding electrode portion 14B, the second mover 2B is maintained fixed to the glass plate 15 side.
(3) Next, the voltage H is applied to the holding electrode portion 14A at the time point t2 as shown in FIG. 7 (e) while the voltage H is applied to the holding electrode portion 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode portion. Adsorbed to 14A.
(4) Next, the voltage H is applied to the drive electrode 12B at the time point t3 as shown in FIG. 7 (b) while the voltage H is still applied to the holding electrode portion 14B. The mover-side drive electrode 4 in the vicinity of the drive electrode 12B is attracted to the drive electrode 12B by an electrostatic force, and the mover-side drive electrode 4 is attracted to the drive electrode 12B. The first mover 2A is moved to the glass plate 13 side. The second mover 2B remains fixed to the glass plate 15 side. At this time, the first mover 2A is moved to the right in FIG. 4A by one stripe of the driving electrode portion 12, that is, by one pitch as compared with the case of (1).
(5) Next, the voltage H is applied to the holding electrode portion 14A at the time point t4 as shown in FIG. 7 (e) while the voltage H is still applied to the holding electrode portion 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is a holding electrode. Adsorbed to part 14A.
(6) Next, the voltage H is applied to the drive electrode 12C at the time point t5 as shown in FIG. 7 (c) while the voltage H is still applied to the holding electrode portion 14B. The mover-side drive electrode 4 in the vicinity of the drive electrode 12C is attracted to the drive electrode 12C by an electrostatic force, and the mover-side drive electrode 4 is attracted to the drive electrode 12C. Therefore, the first mover 2A is moved to the glass plate 13 side. The second mover 2B remains fixed to the glass plate 15 side. At this time, the first mover 2A is moved to the right of FIG. 4A by the two stripes of the driving electrode portion 12, that is, by two pitches, as compared with the case of (1).
(7) Next, the voltage H is applied to the holding electrode portion 14A at the time point t6 as shown in FIG. 7 (e) while the voltage H is still applied to the holding electrode portion 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode. Adsorbed to part 14A.
(8) Next, the voltage H is applied to the drive electrode 12D at the time point t7 as shown in FIG. 7 (d) while the voltage H is still applied to the holding electrode portion 14B. The mover-side drive electrode 4 in the vicinity of the drive electrode 12D is attracted to the drive electrode 12D by an electrostatic force, and the mover-side drive electrode 4 is attracted to the drive electrode 12D. The first mover 2A is moved to the glass plate 13 side. Again, the second mover 2B remains temporarily fixed to the glass plate 15 side. At this time, as compared with the case of (1), the first mover 2A is moved to the right of FIG. 4 (a) by the three stripes of the driving electrode portion 12, that is, by three pitches.
(9) Next, the voltage H is applied to the holding electrode portion 14A at the time point t8 as shown in FIG. 7 (e) while the voltage H is still applied to the holding electrode portion 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is a holding electrode. Adsorbed to part 14A.
(10) Next, the voltage H is applied to the drive electrode 12A at the time point t9 as shown in FIG. 7 (a) while the voltage is still applied to the holding electrode portion 14B. The mover-side drive electrode 4 in the vicinity of the drive electrode 12A is attracted to the drive electrode 12A by an electrostatic force, and the mover-side drive electrode 4 approaches the drive electrode 12A. The first mover 2A is moved to the glass plate 13 side. The second mover 2B remains temporarily fixed to the glass plate 15 side. At this time, the first mover 2A is moved to the right in FIG. 4A by four stripes of the driving electrode portion 12 and four pitches as compared with the case of (1).
[0093] The steps (1) to (10) as described above are repeated for the distance for which the first mover 2A is desired to be moved, and the first mover 2A is moved.
[0094] Further, when it is desired to move the first mover 2A to the left, in the operation mode of 3 , (1), (10), (9), (8), (7), ( The first mover 2A is moved by repeating the distances to be moved in the order of 6), (5), (4), (3), and (2).
[0095] Here, the operation modes of (3) and (4) are both operations performed to enlarge or reduce the captured image, and are the initial stages of the first and second movers 2A and 2B. Depending on the position, which mover should be moved in which direction to expand or contract in a short time shall be appropriately selected.
[0096] FIG. 4B shows the case where the first mover 2A moves to the glass plate 13 side, and FIG. 4C shows the case where the second mover 2B moves to the glass plate 15 side. , Each is shown.
[0097] In the actuator shown in FIG. 4A, the drive electrodes 12A to 12D of the drive electrode portion 12 are substantially equal to the widths of the mover side drive electrodes 4 and 8 and have an array pitch. It is set equally. As a modification of such an actuator, as shown in FIGS. 8 (a) to 8 (c), the drive electrodes 12A to 12D of the drive electrode portion 12 have the widths of the mover side drive electrodes 4 and 8. It may be set to 1/2 or less, and the arrangement pitch may be set to 1/4. In the actuator having such a structure, when the movers 2A and 2B are attracted to the drive electrodes 12A to 12D of the drive electrode portion 12, respectively, the mover side drive electrodes 4 and 8 are shown in FIG. 8 (a). ) ~ As shown in FIG. 8 (c), the two driving electrodes 12A to 12D are always opposed to each other.
[0098] Regarding the operation of the actuators shown in FIGS. 8 (a) to 8C, FIGS. 9 (a) to 9 (f), FIGS. 10 (a) to 10 (f), and FIGS. 11 (a) to 11 This will be described below with reference to (f).
[0099] 1 The operation mode 1 in which the first and second movers 2A and 2B are simultaneously moved to the right as shown in FIG. 8A is realized in the following order.
(1) First, the driving electrodes 4 and 8 of the movers 2A and 2B are maintained in contact with the ground. In this state, the voltage H is applied to the drive electrodes 12A and 12B as shown in FIGS. 9A and 9B. The mover side drive electrodes 4 and 8 in the vicinity of the drive electrodes 12A and 12B are attracted to the drive electrodes 12A and 12B by electrostatic force, and the mover side drive electrodes 4 and 8 are attached to the drive electrodes 12A and 12B. Be adsorbed. Therefore, the first and second movers 2A and 2B are moved to the glass plate 13 side.
(2) Next, as shown in FIGS. 9 (a) and 9 (b), the voltages of the drive electrodes 12A and 12B are changed to a low level L at time point t1, and FIGS. 9 (e) and 9 (b) and FIG. As shown in 9 (f), voltage H is applied to the holding electrodes 14A and 14B. Therefore, a strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, and the first mover 2A is moved to the glass plate 15 side and held by the mover side fixed electrode 5. It is adsorbed on the electrode portion 14A. Further, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is moved to the glass plate 15. It is attracted to the holding electrode portion 14B.
(3) Next, as shown in FIGS. 9 (e) and 9 (f), the voltage of the holding electrodes 14A and 14B was changed to a low level L at time point t2, and in FIGS. 9B and 9C. A voltage H is applied to the drive electrodes 12B and 12C as shown. The mover side drive electrodes 4 and 8 in the vicinity of the drive electrodes 12B and 12C are attracted to the drive electrodes 12B and 12C by electrostatic force, and the mover side drive electrodes 4 and 8 are attached to the drive electrodes 12B and 12C. Be adsorbed. Therefore, the first and second movers 2A and 2B are moved to the glass plate 13 side. At this time, as compared with the case of (1), the drive electrode portion 12 is moved to the right by one stripe, that is, one pitch.
(4) Next, at time point t3, the voltages of the driving electrodes 12B and 12C were changed to a low level L, and as shown in FIGS. 9 (e) and 9 (f), the holding electrodes 14A, again. A voltage H is applied to 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is used for holding. It is adsorbed on the electrode portion 14A. Further, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is used for holding. It is adsorbed on the electrode portion 14B.
(5) Further, at the time point t4, the voltage of the holding electrodes 14A and 14B is changed to a low level L, and a voltage is applied to the driving electrodes 12C and 12D as shown in FIGS. 9C and 9D. The mover side drive electrodes 4 and 8 near the drive electrodes 12C and 12D are attracted to the drive electrodes 12C and 12D by electrostatic force, and the mover side drive electrodes 4 and 8 are attracted to the drive electrodes 12C and 12D. Will be done. The first and second movers 2A and 2B are moved to the glass plate 13 side. At this time, as compared with the case of (1), the drive electrode portion 12 is moved to the right by two stripes, that is, two pitches in the right direction of FIG. 8 (a).
(6) Next, at time point t5, the voltages of the driving electrodes 12C and 12D were changed to a low level L, and as shown in FIGS. 9 (e) and 9 (f), the holding electrodes 14A, again. A voltage is applied to 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode. Adsorbed to part 14A. Further, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is moved to the glass plate 15. It is adsorbed on the holding electrode portion 14B.
(7) Next, at time point t6, the voltages of the holding electrodes 14A and 14B are changed to a low level L, and the voltage H is applied to the driving electrodes 12B and 12A as shown in FIGS. 9D and 9A. Will be done. The mover side drive electrodes 4 and 8 in the vicinity of the drive electrodes 12B and 12A are attracted to the drive electrodes 12B and 12A by electrostatic force, and the mover side drive electrodes 4 and 8 are attached to the drive electrodes 12B and 12A. Be adsorbed. The first and second movers 2A and 2B are moved to the glass plate 13 side. At this time, as compared with the case of (1), the drive electrode portion 12 is moved to the right by three stripes, that is, three pitches, in the right direction of FIG. 8 (a).
(8) Next, at time point t7, the voltage of the driving electrode 12A was changed to a low level L, and as shown in FIGS. 9 (e) and 9 (f), the holding electrodes 14A and 14B again. The voltage H is applied. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is used for holding. It is adsorbed on the electrode portion 14A. Further, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is held. It is adsorbed on the electrode portion 14B.
(9) Next, at time point t8, the voltages of the holding electrodes 14A and 14B are changed to a low level L, and the driving electrodes 12A are again as shown in FIGS. 9 (a) and 9 (b). And voltage is applied to 12B. The mover side drive electrodes 4 and 8 near the drive electrodes 12A and 12B are attracted to the drive electrodes 12A and 12B by electrostatic force, and the mover side drive electrodes 4 and 8 are attracted to the drive electrodes 12A and 12B. Will be done. The first and second movers 2A and 2B are moved to the glass plate 13 side. At this time, as compared with the case of (1), the drive electrode portion 12 is moved to the right by four pitches by four stripes in FIG. 8 (a).
[0109] The above steps (1) to (9) are repeated for the distances at which the first and second movers 2A and 2B are desired to be moved.
[0110] 2 When moving both the first and second movers 2A and 2B to the left in FIG. 4 (a), if the steps of the operation mode of 1 are reversed, the left The first and second movers 2A and 2B can be moved in the direction. That is, in the above-mentioned mode of 1 , move in the order of (9), (8), (7), (6), (5), (4), (3), (2), (1). Each step may be repeated for a desired distance to move the first and second movers 2A and 2B.
[0111] 3 When the first mover 2A is fixed and only the second mover 2B is moved to the left or right.
[0112] A case where the second mover 2B is moved to the right as shown in FIG. 8B will be described below.
(1) First, the drive electrodes 4 and 8 of the movers 2A and 2B are maintained in the ground as in the operation mode of 1 . As shown in FIG. 10 (f), a voltage is applied to the holding electrode portion 14B. An electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 5, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode portion 14B. Is adsorbed on. When a voltage is applied to the holding electrode portion 14A as shown in FIG. 10 (e), the first mover 2A is attracted to the glass plate 15.
(2) Next, as shown in FIGS. 10 (e), the driving electrode 12A and the driving electrode 12A at time point t1 as shown in FIGS. 10 (a) and 10B while the voltage H is applied to the holding electrode portion 14B. A voltage H is applied to 12B. The mover-side drive electrodes 8 in the vicinity of the drive electrodes 12A and 12B are attracted to the drive electrodes 12A and 12B by electrostatic force, and the mover-side drive electrodes 8 are attracted to the drive electrodes 12A and 12B. Therefore, the second mover 2B is moved to the glass plate 13 side. On the other hand, since the voltage H is applied to the holding electrode portion 14A, the first mover 2A is maintained fixed to the glass plate 15 side.
(3) Next, with the voltage applied to the holding electrode portion 14A, the voltage H is applied to the holding electrode portion 14B at the time point t2 as shown in FIG. 10 (f). Therefore, a strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is used for holding. It is adsorbed on the electrode portion 14B.
(4) Next, the voltage H is applied to the drive electrodes 12B and 12C at the time point t3 as shown in FIGS. 10B and 10C while the voltage is still applied to the holding electrode portion 14A. The mover side drive electrode 8 in the vicinity of the drive electrodes 12B and 12C is attracted to the drive electrodes 12B and 12C by an electrostatic force, and the mover side drive electrode 8 is attracted to the drive electrodes 12B and 12C. Therefore, the second mover 2B is moved to the glass plate 13 side. The first mover 2A is similarly held fixed to the glass plate 15 side. At this time, the second mover 2B is moved to the right in FIG. 8 (b) by one stripe of the driving electrode portion 12, that is, by one pitch as compared with the case of (1).
(5) Next, the voltage H is applied to the holding electrode portion 14B at the time point t4 as shown in FIG. 10 (f) while the voltage is still applied to the holding electrode portion 14A. A strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is the holding electrode portion. Adsorbed on 14B.
(6) Next, the voltage is applied to the drive electrodes 12C and 12D at the time point t5 as shown in FIGS. 10 (c) and 10D while the voltage is still applied to the holding electrode portion 14A. The mover side drive electrode 8 in the vicinity of the drive electrodes 12C and 12D is attracted to the drive electrode 12C by an electrostatic force, and the mover side drive electrode 8 is attracted to the drive electrodes 12C and 12D. Therefore, the second mover 2B is moved to the glass plate 13 side. The first mover 2A is still fixed to the glass plate 15 side. At this time, the second mover 2B is moved to the right in FIG. 8 (b) by the two stripes of the drive electrode portion 12, that is, by two pitches, as compared with the case of (1).
(7) Next, the voltage H is applied to the holding electrode portion 14B at the time point t6 as shown in FIG. 10 (f) while the voltage is still applied to the holding electrode portion 14A. A strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is used for holding. It is adsorbed on the electrode portion 14B.
(8) Next, while the voltage is applied to the holding electrode portion 14A, the voltage is applied to the driving electrodes 12D and 12A at the time point t7 as shown in FIGS. 10 (d), 10 (d) and 10A. Will be done. The mover side drive electrode 8 in the vicinity of the drive electrodes 12D and 12A is attracted to the drive electrodes 12D and 12A by an electrostatic force, and the mover side drive electrode 8 approaches the drive electrodes 12D and 12A. The second mover 2B is moved to the glass plate 13 side. The first mover 2A remains fixed to the glass plate 15 side. At this time, the second mover 2B is moved to the right in FIG. 8 (b) by the three stripes of the drive electrode portion 12, that is, by three pitches, as compared with the case of (1).
(9) Next, a voltage is applied to the holding electrode portion 14B at the time point t8 as shown in FIG. 10 (f) while the voltage is still applied to the holding electrode portion 14A. A strong electrostatic force is generated between the holding electrode portion 14B and the mover side fixed electrode 11, the second mover 2B is moved to the glass plate 15 side, and the mover side fixed electrode 11 is used for holding. It is adsorbed on the electrode portion 14B.
(10) Next, as shown in FIGS. 10 (a) and 10 (b), the voltage is applied to the drive electrodes 12A and 12B at the time point t9 while the voltage is still applied to the holding electrode portion 14A. .. The mover-side drive electrodes 8 in the vicinity of the drive electrodes 12A and 12B are attracted to the drive electrodes 12A and 12B by electrostatic force, and the mover-side drive electrodes 8 are close to the drive electrodes 12A and 12B. The second mover 2B is moved to the glass plate 13 side. The first mover 2A is similarly held fixed to the glass plate 15 side. At this time, the second mover 2B is moved to the right in FIG. 10B by four stripes of the drive electrode portion 12 and four pitches as compared with the case of (1).
[0123] The steps (1) to (10) as described above are repeated for the desired distance to move the second mover 2B, and the mover 2B is moved.
[0124] Further, when it is desired to move the mover 2B to the right, (1), (10), (9), (8), (7), (6), (in the above-mentioned 3 The second mover 2B can be moved by repeating the movement in the order of 5), (4), (3), and (2) for the desired distance.
[0125] 4 When the second mover 2B is fixed and only the first mover 2A is moved to the left or right.
[0126] Hereinafter, a case where the first mover 2A is moved to the right as shown in FIG. 8C will be described.
(1) First, the drive electrodes 4 and 8 of the movers 2A and 2B are maintained in a grounded state in the same manner as in the operation mode of 1 . As shown in FIG. 11 (e), a voltage is applied to the holding electrode portion 14A. An electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 11, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode portion. Adsorbed to 14A. Here, when a voltage is applied to the holding electrode portion 14B as shown in FIG. 11F, the second mover 2B is attracted to the glass plate 15.
(2) Next, as shown in FIG. 11 (f), the driving electrodes 12A and 12B at time point t1 as shown in FIG. 11 (a) while the voltage H is still applied to the holding electrode portion 14B. The voltage H is applied to. Therefore, the mover side drive electrode 4 in the vicinity of the drive electrodes 12A and 12B is attracted to the drive electrodes 12A and 12B by electrostatic force, and the mover side drive electrode 4 is attracted to the drive electrodes 12A and 12B. To. As a result, the first mover 2A is moved to the glass plate 13 side. On the other hand, since the voltage H is applied to the holding electrode portion 14B, the second mover 2B is maintained fixed to the glass plate 15 side.
(3) Next, the voltage H is applied to the holding electrode portion 14A at the time point t2 as shown in FIG. 11 (e) while the voltage H is still applied to the holding electrode portion 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode portion. Adsorbed to 14A.
(4) Next, the voltage H is applied to the driving electrodes 12B and 12C at the time point t3 as shown in FIG. 11B while the voltage H is still applied to the holding electrode portion 14B. The mover side drive electrode 4 in the vicinity of the drive electrodes 12B and 12C is attracted to the drive electrodes 12B and 12C by an electrostatic force, and the mover side drive electrode 4 is attracted to the drive electrodes 12B and 12C. The first mover 2A is moved to the glass plate 13 side. The second mover 2B remains fixed to the glass plate 15 side. At this time, as compared with the case of (1), the first mover 2A is moved to the right in FIG. 8 (c) by one stripe of the driving electrode portion 12, that is, by one pitch.
(5) Next, the voltage H is applied to the holding electrode portion 14A at the time point t4 as shown in FIG. 11 (e) while the voltage H is still applied to the holding electrode portion 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is a holding electrode. Adsorbed to part 14A.
(6) Next, the voltage H is applied to the driving electrodes 12C and 12D at the time point t5 as shown in FIGS. 12C and 12D while the voltage H is applied to the holding electrode portion 14B. The mover side drive electrode 4 in the vicinity of the drive electrodes 12C and 12D is attracted to the drive electrodes 12C and 12D by an electrostatic force, and the mover side drive electrode 4 is attracted to the drive electrodes 12C and 12D. Therefore, the first mover 2A is moved to the glass plate 13 side. The second mover 2B remains fixed to the glass plate 15 side. At this time, the first mover 2A is moved to the right of FIG. 4A by the two stripes of the driving electrode portion 12, that is, by two pitches, as compared with the case of (1).
(7) Next, the voltage H is applied to the holding electrode portion 14A at the time point t6 as shown in FIG. 11 (e) while the voltage H is still applied to the holding electrode portion 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is the holding electrode. Adsorbed to part 14A.
(8) Next, while the voltage H is applied to the holding electrode portion 14B, the voltage H is applied to the driving electrodes 12B and 12A at the time point t7 as shown in FIGS. 11D and 11A. The mover-side drive electrodes 4 in the vicinity of the drive electrodes 12B and 12A are attracted to the drive electrodes 12B and 12A by electrostatic force, and the mover-side drive electrodes 4 are attracted to the drive electrodes 12B and 12A. The first mover 2A is moved to the glass plate 13 side. Again, the second mover 2B remains temporarily fixed to the glass plate 15 side. At this time, as compared with the case of (1), the first mover 2A is moved to the right in FIG. 8 (c) by the three stripes of the driving electrode portion 12, that is, by three pitches.
(9) Next, the voltage H is applied to the holding electrode portion 14A at the time point t8 as shown in FIG. 11 (e) while the voltage H is still applied to the holding electrode portion 14B. A strong electrostatic force is generated between the holding electrode portion 14A and the mover side fixed electrode 5, the first mover 2A is moved to the glass plate 15 side, and the mover side fixed electrode 5 is a holding electrode. Adsorbed to part 14A.
(10) Next, the voltage H is applied to the driving electrodes 12A and 12B at the time point t9 as shown in FIGS. 11A and 11B while the voltage is still applied to the holding electrode portion 14B. The mover-side drive electrodes 4 in the vicinity of the drive electrodes 12A and 12B are attracted to the drive electrodes 12A and 12B by electrostatic force, and the mover-side drive electrodes 4 are close to the drive electrodes 12A and 12B. The first mover 2A is moved to the glass plate 13 side. The second mover 2B remains temporarily fixed to the glass plate 15 side. At this time, the first mover 2A is moved to the right in FIG. 8 (c) by four stripes of the drive electrode portion 12 and four pitches as compared with the case of (1).
[0137] The steps (1) to (10) as described above are repeated for the desired distance to move the first mover 2A, and the first mover 2A is moved.
[0138] Further, when it is desired to move the first mover 2A to the right, (1), (10), (9), (8), (7), (6) in the step of 3 . ), (5), (4), (3), (2) are repeated for the desired distance to move the first mover 2A.
Next, refer to FIGS. 12 (a) and 12 (b) for the relationship between the positions of the first and second movers 2A and 2B and the zooming magnification (magnification or reduction magnification) of the lens system. I will explain.
[0140] Normally, the control signal for zooming is an input unit provided by the user in a device such as a PDA equipped with an electrostatic actuator, for example, a signal input to a button or a knob is sent to the control unit 19 in the device. It is sent and generated by the control unit 19 based on this input signal. The first and second movers 2A and 2B are driven according to this control signal.
First, FIG. 12 (a) shows a vertical cross-sectional view of the electrostatic actuator, and FIG. 12 (b) shows the relationship between the axial positions of the first and second movers 2A and 2B and the optical magnification. It is a graph which shows. In FIG. 12 (b), the curve P shows the movement range of the first mover 2A , and the curve Q shows the movement range of the second mover 2B. As is clear from FIG. 12 (b), there is a region where the movement ranges of the first and second movers 2A and 2B overlap in the vicinity of the substantially center of the stator 3. In the graph of FIG. 12B, the origin of the horizontal axis is defined at one opening on the side where the first mover 2A of the stator 3 of the electrostatic actuator is provided.
[0142] As shown in FIG. 12 (a), the CCD sensor 17 is fixed to the image plane of the lenses 6 and 9 in the other opening on the side where the second mover 2B of the stator 3 is provided. Arranged on the plate 18, the fixing plate 18 is fixed to the other opening of the stator 3.
Further, as shown in FIG. 12B, when the optical system is set to a certain optical magnification X, the first mover 2A is at point E and the second mover 2B is at point F. Is placed in. Similarly, when the optical system is set to an optical magnification larger than the optical magnification X, the first mover 2A is arranged at the point G and the second mover 2B is arranged at the point H. Further, when the optical system is set to an optical magnification larger than the optical magnification Y at Z, the first mover 2A is arranged at the point I and the second mover 2B is arranged at the point J.
[0144] When the first and second movers 2A and 2B are moved to a desired position corresponding to a desired optical magnification, the first and second movers 2A and 2B are first roughly operated. Next, either one of the first and second movers 2A and 2B is fixed, and the other movable mover is finely moved to set the position to a desired position. Next, the other mover whose position has been set is fixed, and one mover is finely moved to be set to a desired position (fine movement).
[0145] The first and second movers 2A and 2B are independently moved by the steps of the operation modes of 1 to 4 described above for such an operation, so that the optical system has a desired magnification. Is set to.
[0146] In the above-described embodiment, after the first and second movers 2A and 2B are roughly operated, one mover is fixed and the other mover is finely moved to set the desired position. The optical system is set to an optical magnification. However, since the first and second movers 2A and 2B are controlled independently, the position setting is performed without fixing one of the first and second movers 2A and 2B in the middle of the position setting. And the second movers 2A and 2B may be moved directly to their respective desired positions to obtain a desired optical magnification. Further, in such an operation, when the first mover 2A moves to the drive electrode portion 12 side or is temporarily fixed to the drive electrode portion 12 side, the second mover 2B is always used. Is moved to the holding electrode portion 14B side or temporarily fixed to the holding electrode portion 14B. However, in the case of the latter operation, the time required for enlargement or reduction is slightly longer than that of the former.
[0147] In the first embodiment as described above, a desired optical magnification can be obtained by independently operating a plurality of movers for enlarging or reducing the image to be captured.
[0148] Next, the actuator according to the second embodiment of the present invention will be described with reference to FIGS. 13 (a) to 13C.
[0149] In each of the following embodiments, the same components are designated by the same reference numerals, and redundant description will be omitted.
[0150] In the actuator according to the second embodiment, the mover-side fixed electrodes 5 and 11 are formed on substantially the entire lower surface of the first and second movers 2A and 2B.
[0151] FIG. 13 (a) is a side view schematically showing a mover of an actuator according to a second embodiment of the present invention, and FIG. 13 (b) is shown in FIG. 13 (a). FIG. 13 (c) is a plan view schematically showing the lower surface of the mover, and FIG. 13 (c) is a glass plate of the actuator according to the second embodiment of the present invention, which is shown in FIG. 13 (a). It is a top view which shows roughly the upper surface of the glass plate on which the actuator is slid.
[0152] As shown in FIG. 13 (b), a movable element side fixed electrode 5 having a shape is provided on the lower surface of the first mover 2A shown in FIG. 13 (a). The movable element side fixed electrode 5 is formed in a substantially comb shape which spreads in a plane in the lower surface of the first movable element 2A and has three protruding areas and two recessed areas between them on the second movable element 2B side. Has been done.
[0153] Further, as shown in FIG. 13 (b), a mover side fixed electrode 11 is provided on the lower surface of the second mover 2B. The mover side fixed electrode 11 spreads in a plane in the lower surface of the second mover 2B, and is formed in a substantially comb shape having three recessed regions and two protruding regions in between on the first mover 2A side. Has been done. As is clear from FIG. 13 (b), the mover-side fixed electrodes 5 and 11 are formed in a complementary shape so that one concave region thereof is fitted to the other protrusion region.
[0154] Further, the holding electrode portions 14A and 14B spread flat so as to be electrically separated at the central portion of the glass plate 15 as shown in FIG. 13 (c), and the movable elements are respectively located at the central portion. It is formed in a shape corresponding to the shapes of the side fixed electrodes 5 and 11. That is, in the central portion of the glass plate 15, the holding electrode portions 14A and 14B are formed in a complementary shape so that one recess region is fitted to the other protrusion region. An actuator having such a structure operates in the same manner as the actuator shown in FIG. 4 (a). However, the holding electrode portion 14A for temporarily fixing the first mover 2A to the glass plate 15 side is formed only to the substantially central portion of the glass plate 15, and the second mover 2B Since the holding electrode portion 14B that temporarily fixes the holding electrode portion 14B to the glass plate 15 side is formed only to the substantially central portion of the glass plate 15 in which the holding electrode portion 14A is not formed, the first mover 2A is The second mover 2B can only be moved from the opening to about half of the glass plate 15, and the second mover 2B can only be moved from the CCD sensor 17 to about half of the glass plate 15.
[0155] Further, after the movement of the first and second movers 2A and 2B is completed, the first mover 2A is any one of the drive electrode portions 12 and 14A until a new movement is started. In addition, the second mover 2B is temporarily fixed to either the drive electrode portions 12 and 14B, respectively. In this fixed state, even when the main power supply of the device equipped with the electrostatic actuator is turned off, the internal power supply is energized and the device is continuously held.
[0156] In the actuator according to the second embodiment as described above, a desired optical magnification can be obtained by independently operating a plurality of movers for enlarging or reducing the image to be captured. Can be done.
[0157] Further, the moving range of the first and second actuators 2A and 2B is smaller than that of the first embodiment described above, but the first and second actuators 2A and 2B come into contact with each other. The reliability of the electrostatic actuator is improved by eliminating the possibility of damage.
Next, the actuator according to the third embodiment of the present invention will be described with reference to FIGS. 14 (a) to 14 (c).
[0159] As shown in FIG. 14 (b), in this actuator, the mover side fixed electrodes 5 and 11 are formed in a flat plate shape.
FIG. 14 (a) is a side view schematically showing a mover according to a third embodiment of the present invention, and FIG. 14 (b) is a lower surface of the mover shown in FIG. 14 (a). 14 (c) is a plan view schematically showing the upper surface of the glass plate of the actuator according to the third embodiment of the present invention.
[0161] The fixed electrode 5 on the mover side is formed in a flat plate shape as shown on the left side of FIG. 14 (b). However, it is assumed that the fixed electrode 5 on the mover side has an area of at least half or more of the area of the lower surface of the first mover 2A and is not formed over the entire area. For example, the mover-side fixed electrode 5 is provided so as to be displaced in a predetermined direction and separated from the mover 2B.
[0162] The mover-side fixed electrode 11 is formed in a flat plate shape as shown on the right side of FIG. 14 (c). However, it is assumed that the mover-side fixed electrode 11 has an area of at least half or more of the area of the lower surface of the second mover 2B and is not formed over the entire area. For example, the mover-side fixed electrode 11 is provided so as to be displaced to the side opposite to the predetermined direction and away from the mover 2A.
[0163] Further, the holding electrode portions 14A and 14B are formed in a shape that extends flat as shown in FIG. 14 (c), respectively. That is, two flat plate-shaped holding electrode portions 14A and 14B are formed on the glass plate 15 so as to be separated from each other. The areas of the rectangular holding electrode portions 14A and 14B are set according to the moving range (optical magnification) of each mover, and may be substantially the same or different. Further, for example, the holding electrode portion 14A is displaced on the glass plate 15 in a predetermined direction, and the holding electrode portion 14B is displaced on the glass plate 15 in a direction opposite to the predetermined direction. Will be done.
[0164] In the actuator having such a structure, the actuator operates in substantially the same manner as in the first embodiment described above. Further, the first and second movers 2A and 2B can move only within the range in which the holding electrode portions 14A and 14B are formed as in the second embodiment. Further, after the movement of the first and second movers 2A and 2B is completed, the first mover 2A is placed on any of the drive electrode portions 12 and 14A until a new movement is started. The second mover 2B continues to be temporarily fixed to either the driving electrode portion 12 or 14B, respectively. It is assumed that this fixed state is energized and held by the internal power supply even when the main power supply of the device equipped with the electrostatic actuator is turned off.
[0165] In the actuator having the above-described structure, a desired optical magnification can be obtained by independently operating a plurality of movers for enlarging or reducing the captured image.
[0166] Further, the moving range of the first and second actuators 2A and 2B is smaller than that of the first embodiment, but the first and second actuators 2A and 2B are damaged by contact with each other. The possibility of this is eliminated, and the reliability of the operation of the electrostatic actuator is improved.
[0167] Further, since the holding electrode portions 14A and 14B have a flat plate shape, they can be easily manufactured and contribute to a reduction in manufacturing cost.
[0168] Next, a method for manufacturing the first and second movers 2A and 2B and the stator 3 in the first to third embodiments described above will be described with reference to FIGS. 15 (a) to 19. To do.
[0169] First, a method for manufacturing the stator 3 will be described with reference to FIGS. 15 (a) to 15 (c).
[0170] FIG. 15 (a) is a plan view showing the parts of the mover in an unfolded manner, and FIG. 15 (b) is a perspective view showing the parts of the mover shown in FIG. 15 (a) assembled. FIG. 15 (c) is a plan view schematically showing a state in which the mover component is mounted on the mold in the manufacturing process of the stator frame, and FIG. 15 (d) is the process of FIG. 15 (c). It is a perspective view which shows typically the mover manufactured through.
As shown in FIG. 15 (a), the parts of the first mover 2A are the first flat plate 20 provided with the electrode 4, the second flat plate 21, the first plate provided with the electrode 5, and the electrode 5. It is composed of an arc-shaped first connecting member 22 connecting the second flat plates 20 and 21, an arc-shaped second connecting member 23, and an abutting member 24 attached to the first flat plate 20. On the surfaces of the first flat plate 20 and the second flat plate 21, a concave-convex movable element side driving electrode 4 and a movable element side fixed electrode 5 are formed by etching. The first flat plate 20, the second flat plate 21, the first connecting members 22,22, the second connecting members 23,23, and the mating member 24 are integrally press-molded from the metal plate.
[0172] Such a part of the first mover 2A is bent and assembled as shown in FIG. 15 (b). The connecting portion between the first flat plate 20 and the first connecting members 22, 22 so that the movable element side driving electrode 4 and the movable element side fixed electrode 5 are arranged on the outside, and the second flat plate 21 and the first The connecting portions with the connecting members 22 and 22, the connecting portions between the second flat plate 21 and the second connecting members 23 and 23, and the connecting portions between the second connecting members 23 and 23 and the mating member 24 are bent, respectively. After bending, the contact member 24 and the first flat plate 20 are joined by spot welding or the like. The first and second connecting members 22, 22, 23, 23 are members that can elastically receive external pressure, and the mover structure has flexibility.
Next, as shown in FIG. 15 (c), the component of the first mover 2A is fixed with a resin.
[0174] To fix the first mover 2A, molds 25A, 25B, 25C, 25D that can be separated into four are used. Since the convex portions of the mover side drive electrode 4 and the mover side fixed electrode 5 are in contact with the inner surfaces of the molds 25A and 25B, a concave space is provided. The mold 25C, which is sandwiched and fixed between the molds 25A and 25B, has a convex portion for fitting the stepped lens 6 on the surface side facing the inner wall of the molds 25A and 25B. The mold 25D, which is sandwiched and fixed between the molds 25A and 25B facing the mold 25C, is for driving the mover side of the first and second flat plates 20, 21 so as to abut the mold 25C. It is arranged with a gap on the surface that does not have the electrode 4 and the mover side fixed electrode 5.
[0175] First, the convex portions of the mover-side drive electrode 4 and the mover-side fixed electrode 5 of the first mover 2A are arranged so that the molds 25A and 25B are in contact with each other.
Next, the molds 25C and 25D are inserted into the gaps between the molds 25A and 25B so as to close the first mover 2A in the vertical direction. The first mover 2A is surrounded by molds 25A to 25D. At this time, the first flat plate 20 and the second flat plate 21 are urged against the molds 25A and 25B by the connecting members 22, 22, 23, 23. Molds 25A to 25D are fixed so that they do not move.
Next, the resin is introduced into the gap through the resin introduction hole 26 penetrating a part of the mold 25B. At this time, the molds 25A to 25D are held at about 150 ° C. by a heating means such as a heater, and the resin is poured while the resin is held at about 300 ° C. After the resin is poured, the temperature is gradually lowered to about room temperature with the passage of time to solidify the resin. By solidifying the resin, the first mover 2A is fixed without being moved by the connecting members 22, 22, 23, 23.
[0178] At this time, since the first and second flat plates 20, 21 are always urged by the molds 25A, 25B with a constant elastic force, the first and second flat plates 20, 21 are substantially constant. Have a distance of. Therefore, the distance between the mover side drive electrode 4 and the mover side fixed electrode 5 of the first mover 2A manufactured by solidifying the resin is substantially constant, and between the plurality of first movers 2A. It is possible to obtain an almost constant shape with no variation in manufacturing accuracy.
As shown in FIG. 15 (d), the lens 6 is provided on one surface of the first mover 2A in the axial direction.
[0180] As described above, the mover 2B is also manufactured by the same manufacturing method as that of the first mover 2A.
[0181] Further, by using a conductive material mixed with carbon or the like as the resin to be flowed, the reliability of wiring to the movers 2A and 2B can be improved.
[0182] Next, the manufacture of the stator frame 3 will be described with reference to the manufacturing explanatory views of FIGS. 16 (a) to 16 (c).
As shown in FIG. 16A, the molds 30A and 30B that can be separated into two are formed with the outer shape of the stator frame 3 in a state where the molds 30A and 30B are combined. A drilling hole is provided.
[0184] Initially, the molds 30A and 30B are in a separated state.
[0185] The molds 30A and 30B are arranged so that the back surfaces of the glass plates 13 and 15 having a substantially U-shaped cross section come into contact with the convex portions of the pair of facing surfaces 31A and 31B. A patterned driving electrode portion 12 and holding electrode portion 14 are formed on the surfaces of the glass plates 13 and 15 facing the back surfaces, so that the driving electrode portion 12 and the holding electrode portion 14 face each other. The figure arranged in 31A and 31B. Note that Fig. 16 (b) shows the shapes of these electrodes as simplified glass plates 13 and 15.
[0186] The driving electrode portion 12, is held so that the side surface of the rectangular parallelepiped-shaped core 32 shown in FIG. 16 (d) is in contact with the convex portion of the surface 31c and is not in contact with the surface 31D. The molds 30A and 30B are combined so as to come into contact with the edge 33 of the electrode portion 14. When the molds 30A and 30B are combined, as shown in FIG. 16C, the recesses of the driving electrode portion 12 and the holding electrode portion 14 and the recesses of the core 32, the surface 31D and the surface 31c are formed. The figure which is non-contact. In FIG. 16 (c), some details of the shapes of the molds 30A and 30B are omitted.
[0187] Further, the core 32 and the surfaces 34A, 34B, and 34D are not in contact with each other, and the core 32 is in contact with the convex portion of the surface 34C.
[0188] The resin is poured into the gap between the core 32 and the surfaces 34A to 34D. At this time, the molds 30A and 30B are held at about 150 ° C by a heating means such as a heater, and the resin is poured into the gap while being held at about 300 ° C. After the resin is poured, the temperature is gradually lowered to about room temperature with the passage of time to solidify the resin.
[0189] After a lapse of a certain period of time (after the solidification of the resin is completed), the core 32 is taken out, and the molds 30A and 30B are separated to obtain a stator 3 having a desired shape.
[0190] The electrostatic actuator is made by combining the first and second movers 2A and 2B, the stator 3, and the glass plates 13 and 15 manufactured in this manner.
Next, another method for manufacturing the mover will be described with reference to FIGS. 17A to 17C.
As shown in FIG. 17A, the mover-side drive electrode 4 is formed by processing a silicon substrate, and the concave-convex shape of the mover-side drive electrode 4 is the silicon substrate. It is formed by etching so that one surface has a concavo-convex shape having a desired size (several micron order). Etching is substantially the same as the method performed for high integration of LSI, and either wet etching or dry etching may be used.
Further, as shown in FIG. 17B, the mover main body 35 is formed by assembling a flat plate made of a conductive resin into a rectangular parallelepiped shape. A lens 6 is mounted in the axial direction of the mover body 35, and a pad portion 36 for connecting the ground wiring 7 connected to the ground is formed on a part of the side surface of the mover body 35. ..
[0194] As shown in FIG. 17 (c), the mover side drive electrode 4 and the mover body 35 manufactured in this way have a mover side fixed electrode 5 on the upper surface of the mover body 35, for example, ultraviolet rays. The first mover 2A is manufactured by pasting it with an acrylic adhesive that cures with.
[0195] An electrostatic actuator is manufactured by combining the first mover 2A and the stator 3 manufactured in this manner.
Next, a method of manufacturing the mover will be described with reference to FIG.
[0197] FIG. 18 is an explanatory diagram of a method for manufacturing a mover, in which molds 37A to 37D are combined and resin is injected into a gap between molds 37A to 37D to form a first mover 2A. A mold 37D having a length that reaches the mold 37C is used.
[0198] Here, the resin poured into the space of the molds 37A to 37D is a mixture of conductive carbon particles 38 and carbon fiber 39. The carbon particles 38 have a substantially spherical shape with a diameter of several microns, and the carbon fiber 39 has a rod shape with a diameter of about 10 microns and a length of several tens of microns. By solidifying this resin, a first mover 2A without a lens is manufactured.
[0199] According to such a manufacturing method, the convex shapes of the mover side drive electrode 4 and the mover side fixed electrode 5 of the first mover 2A are formed at intervals of, for example, about 20 microns, so that the convex portion is formed. There is a possibility that the carbon fiber 39 does not enter between the 40 and the convex portion 40 provided next to it (that is, the concave portion 41), but the carbon fiber 39 is tentatively inserted into the concave portion due to the inclusion of the carbon particles 38. Even if it does not enter, the first mover 2A having good conductivity can be obtained because the carbon particles 38 enter.
[0200] Further, even if the resin is not a conductive resin, it is possible to impart conductivity by performing a plating treatment after the treatment, which has a drawback of increasing the manufacturing process, but secures good conductivity. be able to.
[0201] Next, another manufacturing method of the mover and the stator will be described with reference to FIG.
[0202] FIG. 19 is an explanatory diagram of a manufacturing method of a mover and a stator, in which the first and second movers 2A and 2B and the first and second movers 2A and 2B are attached to the mold 42A. The stator 3 to be inserted and the stator 3 are formed in the same mold. Note that FIG. 19 shows an example of a mold in which two stators and movers are formed.
[0203] The shapes of the molds of the first and second movers 2A and 2B are substantially the same as those shown in FIG. 18, and the shape of the mold in which the shape of the stator 3 is formed is shown in FIG. It is almost the same as that shown in (a). The shapes of the mover side drive electrode 4 and the mover side fixed electrode 5 are formed on the pair of inner surfaces 43A-43B of the mold of the first mover 2A, which face each other. Further, the shapes of the driving electrode portion 12 and the holding electrode portion 14 are formed on the pair of inner surfaces 44A and 44B of the mold of the stator 3 which face each other.
[0204] By using the molds 42A and 42B having such a structure, the first and second movers 2A and 2B and the stator frame 3 with little variation in dimensional accuracy can be mass-produced in a short period of time. Can be done.
[0205] It goes without saying that the present invention is not limited to each of the above-described embodiments, and can be variously modified and implemented without departing from the gist thereof. For example, if the positions of the two movers are detected by an optical sensor or the like and the movers collide with each other, one of them can be temporarily fixed to prevent the collision.
[0206] Further, the number of movers inserted into the stator may be three or more in order to obtain a desired magnification, instead of two.
[0207] Further, the shapes of the first joining member and the second joining member may be any shape as long as they have elastic characteristics.
[Effect of the Invention] As described above, according to the electrostatic actuator of the present invention, a plurality of movers can be operated independently of each other. Therefore, the electrostatic actuator of the present invention can be used in a camera or the like. When applied to an optical device, a zooming function for enlarging or reducing an image to be captured can be realized, and a focusing function for focusing on a subject can also be realized.
BRIEF DESCRIPTION OF THE DRAWINGS [Fig. 1] Fig. 1 is a perspective view schematically showing a mover extracted from a stator in a conventional electrostatic actuator.
FIG. 2 is a vertical cross-sectional view schematically showing a structure inside a conventional electrostatic actuator.
FIG. 3A is a perspective view schematically showing the structure of the electrostatic actuator according to the first embodiment of the present invention by breaking the structure, and a pair of movers are extracted from the stator frame. It is a perspective view which shows, (b) is the perspective view which shows schematic arrangement of the stator electrode of the drive side stator shown in (a), and (c) is (a). It is a perspective view which shows typically the stator electrode arrangement of the stator of the side which holds a mover shown in.
FIG. 4 (a) is a vertical sectional view schematically showing an internal structure of the electrostatic actuator shown in FIG. 3 (a), and FIG. 4 (b) shows the electrostatic actuator shown in FIG. 3 (a). It is a cross-sectional view schematically shown by cutting along the XX line, (c) is a cross-sectional view showing the electrostatic actuator shown by (a) cut by the YY line, and (d) is a schematic view. , (A) is a cross-sectional view schematically showing the relationship between the number of fixed electrodes of the mover and the side gap in the electrostatic actuator shown in (a).
5 (a) to 5 (f) are timing charts showing the voltages applied to the electrodes of the stator when two movers are moved in the same direction at the same time in the electrostatic actuator shown in FIG. 4 (a). Is.
6 (a) to 6 (f) show the timings applied to the electrodes of the stator when one of the two movers is moved in a certain direction in the electrostatic actuator shown in FIG. 4 (a). It is a chart.
7 (a) to (f) show the timings applied to the electrodes of the stator when the other of the two movers is moved in a certain direction in the electrostatic actuator shown in FIG. 4 (a). It is a chart.
8 (a) to 8 (c) are modified examples of the electrostatic actuator shown in FIG. 4 (a), and are cross-sectional views schematically showing the operating states of the two movers, respectively.
9 (a) to 9 (f) are timing charts showing the voltage applied to the electrodes of the stator when two movers are moved in the same direction at the same time as shown in FIG. 8 (a). ..
10 (a) to (f) are timing charts showing the voltage applied to the electrodes of the stator when one of the two movers is moved in a certain direction as shown in FIG. 8 (b). is there.
11 (a) to 11 (f) are timing charts showing the voltage applied to the electrodes of the stator when the other of the two movers is moved in a certain direction as shown in FIG. 8 (c). is there.
FIG. 12 (a) is a vertical sectional view schematically showing an internal structure of an electrostatic actuator according to a modified example of the first embodiment of the present invention, and FIG. 12 (b) is shown in (a). It is a graph which shows the relationship between the position of the 1st and 2nd movers in the electrostatic actuator, and the optical magnification.
FIG. 13 (a) is a vertical sectional view schematically showing a mover of an electrostatic actuator according to a modified example of the second embodiment of the present invention, and FIG. 13 (b) is a movable cross-sectional view shown in (a). It is a top view which shows the electrode pattern of the lower surface of the child schematicly, and (c) is the electrode on the glass plate of the stator of the electrostatic actuator which incorporated the mover shown in (a) and (b). It is a top view which shows the pattern schematicly.
FIG. 14 (a) is a vertical sectional view schematically showing a mover of an electrostatic actuator according to a modified example of the second embodiment of the present invention, and FIG. 14 (b) is a movable cross-sectional view shown in (a). It is a plan view which shows the electrode pattern of the lower surface of the child schematicly, and (c) is the electrode pattern on the glass plate of the stator of the electrostatic actuator which incorporated the mover shown in (a) and FIG. It is a top view which shows schematicly.
15 (a) is a plan view schematically showing disassembled parts of the mover of the electrostatic actuator shown in FIG. 4 (a), and FIG. 15 (b) is shown in (a). It is a perspective view which shows the assembled state of a mover part roughly, and (c) is a cross section which shows roughly the part of the mover shown in (b) and the mold which incorporated the mover part. It is a figure, and (d) is the perspective view which shows schematicly the actuator made by the mold shown in (c).
16 (a) is a perspective view schematically showing a mold for manufacturing a stator of the electrostatic actuator shown in FIG. 4 (a) through a part thereof, and FIG. 16 (b) is a perspective view. , FIG. 4 (a) is a perspective view schematically showing a glass plate for manufacturing the stator of the electrostatic actuator shown in FIG. 4 (a), and (c) is a mold of the stator shown in (a). It is a perspective view which shows roughly through a part of the assembled structure which attached the glass plate to, and (d) is schematic which the core attached to the mold of the stator shown in (c) is schematic. It is a perspective view shown in.
FIG. 17 (a) is a perspective view schematically showing electrodes of a mover used in the method for manufacturing an electrostatic actuator of the present invention, and FIG. 17 (b) is a perspective view schematically showing an electrode of a mover used in the method for manufacturing an electrostatic actuator of the present invention. It is a perspective view schematically showing the actuator body used, and (c) is a movable body made by fixing the electrode of the actuator shown in (a) to the actuator body shown in (b). It is a perspective view which shows the child schematicly.
FIG. 18 is a vertical cross-sectional view schematically showing a mover and a die of the mover used in the method for manufacturing an electrostatic actuator of the present invention.
FIG. 19 is a plan view schematically showing molds for a mover and a stator used in the method for manufacturing an electrostatic actuator of the present invention.
[Explanation of symbols] 1 ... Electrostatic actuator 2A, 2B ... 1st and 2nd movers 3 ... Stator 3A ... Stator frame 4,8,5,11 ... Movable Child electrode 4,8 ... Drive electrode 6,9 ... Lens 5,11 ... Fixing electrode 12 ... Stator electrode part 14, 14A, 14B ... Holding electrode part 12A ~ 12D ... Electrodes 13, 15 ... Glass plates 22, 22, 23, 23 ... Connecting members 25A ~ 25D ... Mold
Every citation, both ways
| Document | Relation | Office |
|---|---|---|
| JP11281870A | Cites | Japan |
| JP10239578A | Cites | Japan |
| JP02211078A | Cites | Japan |
| JP07067362A | Cites | Japan |
| JP05308783A | Cites | Japan |
| JP03065081A | Cites | Japan |
| JP02095184A | Cites | Japan |
| JP08262333A | Cites | Japan |
11 members in 3 offices
Priority claims6
| Document | Office | Kind | Date |
|---|---|---|---|
| 2000297432 | Japan | A | |
| 2000297432 | Japan | – | |
| 2001338587 | Japan | A | |
| 20002000297432 | – | – | – |
| JP20000297432 | – | – | – |
| JP20010338587 | – | – | – |
Members11
| Document | Office | Kind | |
|---|---|---|---|
| US2002036443A1 | United States of America | A1 | |
| EP1193853A2 | European Patent Office (EPO) | A2 | |
| JP2002199747A | Japan | A | |
| EP1193853A3 | European Patent Office (EPO) | A3 | |
| US2003209952A1 | United States of America | A1 | |
| US2003218404A1 | United States of America | A1 | |
| US6680558B2 | United States of America | B2 | |
| US6750591B2 | United States of America | B2 | |
| US6774534B2 | United States of America | B2 | |
| JP4064656B2This record | Japan | B2 | |
| EP1193853B1 | European Patent Office (EPO) | B1 |
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Numbers
- Publication
- 4064656
- Publication, DOCDB
- 4064656
- Publication, EPODOC
- JP4064656B
- Application
- 338587
- Application, DOCDB
- 2001338587
- Application, EPODOC
- JP20010338587
Titles2
- Japanese
- 静電アクチュエータ及びその駆動方法
- English
- Electrostatic actuator and its driving method
Classification
- IPC, 3
- G02B7 08
- H02N1 00
- G02B7 04