Optical position detecting device and apparatus provided with position detecting function

The present invention relates to an optical position detection device that optically detects the position of a target object, and a device with a position detection function provided with the optical position detection device.

As an optical position detection device that optically detects a target object, for example, detection light is emitted from each of a plurality of detection light sources toward the target object via a translucent member, and the detection light reflected by the target object is emitted. Is proposed to be detected by the light receiving unit through the light transmitting member. In the optical position detection device having such a configuration, the position of the target object is detected based on the detection result of the detected light in the light receiving unit (see, for example, Patent Document 1).

Further, the optical position detection device is provided with a light guide plate, and the detection light emitted from each of the plurality of detection light sources is emitted toward the target object via the light guide plate, and the detection light reflected by the target object is received. A method of detecting by a unit has also been proposed (see Patent Documents 2 and 3).

<p><patcit num="1"><text>Special Table 2003-534554</text></patcit><patcit num="2"><text>Japanese Unexamined Patent Publication No. 2010-127671</text></patcit><patcit num="3"><text>Japanese Unexamined Patent Publication No. 2009-295318</text></patcit></p>

<p> However, in the optical position detection devices described in Patent Documents 1 to 3, since the range in which the position of the target object can be detected is narrow, a wide area such as the screen surface of the projection display device, the screen surface of the electronic blackboard, and the digital signage. There are many problems to be solved in order to detect the position of the target object in.</p><p> Here, the present inventor bends a band-shaped flexible substrate on which a plurality of light emitting elements are mounted to direct the light emitting elements in different angular directions, and uses the detection light emitted from the light emitting elements to form a target object. It proposes a method for detecting the position. According to such a configuration, the detection light can be emitted over a wide angle range from the position where the flexible substrate is arranged, so that the position of the target object can be detected in a wide area.</p><p> However, in the case of this method, it takes a lot of time and effort to accurately bend the strip-shaped flexible substrate so that the light emitting element faces in a predetermined direction, and it is difficult to fix the flexible substrate in this state. Therefore, we are studying a configuration in which a substrate support member having a convex curved surface is prepared and the flexible substrate is placed on the convex curved surface of the substrate support member, but the dimensions of the flexible substrate vary and the position of the flexible substrate is different. If it varies, the position of the light emitting element varies, and there is a problem that the position of the target object cannot be detected accurately.</p><p> In view of the above problems, an object of the present invention is to adopt a method of detecting the position of an object by using detection light emitted from a plurality of light emitting elements mounted on a curved flexible substrate. It is an object of the present invention to provide an optical position detecting device capable of providing an element at a predetermined position, and a device having a position detecting function provided with such an optical position detecting device.</p>

<p> In order to solve the above problems, the present invention is an optical position detection device that optically detects the position of a target object, and is located in a light source unit that emits detection light and an emission space of the detection light. The light source unit has a light receiving unit that receives the detected light reflected by the target object and a position detecting unit that detects the position of the target object in the emission space based on the light receiving result of the light receiving unit. , A substrate support member having a plurality of light emitting elements, a band-shaped flexible substrate on which the plurality of light emitting elements are mounted, and a convex curved surface curved in the length direction, and the flexible substrate is arranged so as to overlap the convex curved surface. The substrate support member is provided with a notch that is recessed from the convex curved surface at a position overlapping the end portion of the flexible substrate and into which the end portion of the flexible substrate is inserted. ..</p><p> In the present invention, a plurality of light emitting elements are mounted on a strip-shaped flexible substrate, and each of the plurality of light emitting elements emits detection light. Therefore, the position of the target object in the emission space can be detected based on the result of receiving the detection light reflected by the target object located in the emission space of the detection light by the light receiving unit. Here, since the flexible substrate is arranged so as to be overlapped with the convex curved surface of the substrate support member, the flexible substrate is curved in a predetermined shape along the convex curved surface. Therefore, since the detection light can be emitted from the position where the flexible substrate is arranged over a wide angle range, the position of the target object can be detected in a wide area. Further, since the flexible substrate may be curved along the convex curved surface of the substrate support member, it does not require a great deal of time and effort to accurately bend the flexible substrate, and the flexible substrate is held in a curved shape. Is also easy. Further, since the substrate support member has a notch formed at a position overlapping the end portion of the flexible substrate, when one end portion of the flexible substrate is aligned, the other end portion can be inserted into the notch. it can. Therefore, even if the size of the flexible substrate is too large, the flexible substrate can be placed on the convex curved surface of the substrate support member, and the flexible substrate does not float. Therefore, each of the plurality of light emitting elements can be accurately oriented in a predetermined direction. Therefore, each of the plurality of light emitting elements can emit the detected light in a predetermined direction, so that the position of the target object can be detected with high accuracy.</p><p> In the present invention, when the detected light is emitted from the light source unit, it is possible to adopt a configuration in which the emission intensity changes monotonically from one end in the length direction of the convex curved surface toward the other end side. According to such a configuration, a light intensity distribution can be formed in the emission space of the detected light, so that the position of the target object can be detected by using the intensity distribution. Even in the case of such a method, in the present invention, since each of the plurality of light emitting elements is accurately oriented in a predetermined direction, a predetermined light intensity distribution can be formed in the emission space of the detected light. Therefore, the position of the target object can be detected with high accuracy.</p><p> In the present invention, the flexible substrate includes a strip-shaped first flexible substrate and a strip-shaped second flexible substrate parallel to the first flexible substrate in the width direction of the first flexible substrate, and the first flexible substrate is provided. The plurality of light emitting elements mounted on the substrate and the plurality of light emitting elements mounted on the second flexible substrate are lit at different timings from each other, and the plurality of light emitting elements mounted on the first flexible substrate are turned on. In the light emitting element of the above, the emission intensity increases from one end in the length direction of the convex curved surface toward the other end side, and in the plurality of light emitting elements mounted on the second flexible substrate, the length of the convex curved surface is increased. It is possible to adopt a configuration in which the emission intensity decreases from one end in the longitudinal direction toward the other end side. According to this configuration, the first light intensity distribution formed by the plurality of light emitting elements mounted on the first flexible substrate and the second light intensity distribution formed by the plurality of light emitting elements mounted on the second flexible substrate. In, the intensity of the detected light changes in the opposite direction. Therefore, the position of the target object can be detected based on the light receiving result at the light receiving portion when the first light intensity distribution is formed and the light receiving result at the light receiving portion when the second light intensity distribution is formed. .. Even in the case of such a method, in the present invention, since each of the plurality of light emitting elements is accurately oriented in a predetermined direction, a predetermined light intensity distribution can be formed in the emission space of the detected light. Therefore, the position of the target object can be detected with high accuracy.</p><p> In the present invention, it is preferable that the notch is recessed from the convex curved surface at a position overlapping the end portion in the length direction of the flexible substrate and the end portion in the length direction of the flexible substrate is inserted. According to such a configuration, even if the length dimension of the flexible substrate is too large, the flexible substrate can be in a state of being overlapped on the convex curved surface of the substrate support member, and the flexible substrate does not float.</p><p> In this case, the notch can adopt a configuration provided at the end portion of the convex curved surface in the length direction.</p><p> Further, when a plurality of flexible substrates are arranged in series in the length direction of the convex curved surface, the notch is provided at an intermediate position in the length direction of the convex curved surface. It may be adopted.</p><p> In the present invention, the notch may be recessed from the convex curved surface at a position overlapping the one side end portion in the width direction of the flexible substrate, and the one side end portion of the flexible substrate may be inserted. Good. According to such a configuration, even if the width dimension of the flexible substrate is too large, the flexible substrate can be in a state of being overlapped on the convex curved surface of the substrate support member, and the flexible substrate does not float.</p><p> In this case, it is preferable that the substrate support member is provided with a flange portion that protrudes from the convex curved surface and comes into contact with the other end portion in the width direction of the flexible substrate. According to such a configuration, the flexible substrate can be arranged at a predetermined position in the width direction by abutting the other end portion in the width direction of the flexible substrate and the flange portion.</p><p> The optical position detection device to which the present invention is applied can be used for various devices with a position detection function such as a screen surface of a projection display device, a screen surface of an electronic blackboard, digital signage, a show window, and an amusement device.</p>

<figref num="1">It is explanatory drawing which shows typically the whole structure of the optical position detection apparatus which concerns on Embodiment 1 of this invention.</figref><figref num="2">It is explanatory drawing of the light source part of the optical position detection apparatus which concerns on Embodiment 1 of this invention.</figref><figref num="3">It is an exploded perspective view which further disassembled the light source part of the optical position detection apparatus which concerns on Embodiment 1 of this invention.</figref><figref num="4">It is explanatory drawing which shows the state which disassembled the light source part of the optical position detection apparatus which concerns on Embodiment 1 of this invention up and down.</figref><figref num="5">It is explanatory drawing which shows the position detection principle in the optical position detection apparatus which concerns on Embodiment 1 of this invention.</figref><figref num="6">It is explanatory drawing which shows the method of specifying the position of the target object in the optical position detection apparatus which concerns on Embodiment 1 of this invention.</figref><figref num="7">It is explanatory drawing of the light source part of the optical position detection apparatus which concerns on Embodiment 2 of this invention.</figref><figref num="8">It is an exploded perspective view which further disassembled the light source part of the optical position detection apparatus which concerns on Embodiment 2 of this invention.</figref><figref num="9">It is explanatory drawing which shows the state which attached the flexible substrate to the 2nd substrate support member in the optical position detection apparatus which concerns on Embodiment 2 of this invention.</figref><figref num="10">It is explanatory drawing of the light source part of the optical position detection apparatus which concerns on Embodiment 3 of this invention.</figref><figref num="11">It is explanatory drawing which shows the detailed structure of the light source part of the optical position detection apparatus which concerns on Embodiment 3 of this invention.</figref><figref num="12">It is explanatory drawing of the screen apparatus (device with position detection function) with a position detection function to which this invention is applied.</figref><figref num="13">It is explanatory drawing of the projection type display device (device with a position detection function) with a position detection function to which this invention is applied.</figref>

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the axes that intersect each other will be referred to as the X-axis and the Y-axis, and the axes that intersect the X-axis and the Y-axis will be referred to as the Z-axis. Further, in the drawings referred to below, one side in the X-axis direction is shown as the X1 side, the other side is shown as the X2 side, one side in the Y-axis direction is shown as the Y1 side, and the other side is shown as the Y2 side. One side is shown as the Z1 side and the other side is shown as the Z2 side.

[Embodiment 1] (Overall Configuration) FIG. 1 is an explanatory diagram schematically showing an overall configuration of an optical position detection device according to the first embodiment of the present invention.

In FIG. 1, the optical position detection device 10 of the present embodiment is a device that detects the position (X coordinate) in the X direction and the position (Y coordinate) in the Y direction of the target object Ob located in the detection target space 10R. It has a light source unit 20 that emits the detection light L2, and a light receiving unit 60 that receives the detection light L3 reflected by the target object Ob located in the emission space (detection target space 10R) of the detection light L2. Further, the optical position detection device 10 has a light source driving unit 75 for driving the light source unit 20 and a position (X coordinate and Y coordinate) of the target object Ob in the detection target space 10R based on the light receiving result in the light receiving unit 60. ) Is included in the position detection unit 70.

In the present embodiment, the light source unit 20 includes a first light source unit 20A located on one side X1 in the X-axis direction and a second light source unit 20B located on the other side X2 in the X-axis direction, and the first light source unit 20A. And the second light source unit 20B are at the same position in the Y-axis direction and the Z-axis direction.

(Detailed Configuration of Light Source Unit) FIG. 2 is an explanatory view of the light source unit 20 of the optical position detection device 10 according to the first embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are the light source unit 20. It is a perspective view and an exploded perspective view of. FIG. 3 is an exploded perspective view of the light source unit 20 of the optical position detection device 10 according to the first embodiment of the present invention, which is further disassembled. FIG. 4 is an explanatory view showing a state in which the light source unit 20 of the optical position detection device 10 according to the first embodiment of the present invention is disassembled vertically, and FIGS. 4 (a) and 4 (b) are light source units 20. It is explanatory drawing which shows the plane structure of the upper half part, and is explanatory drawing which shows the plane structure of the lower half part of a light source part 20. In FIG. 4A, the entire collar is covered with a chain line, but the collar is also shown with a solid line.

The two light source units 20 (first light source unit 20A and second light source unit 20B) shown in FIG. 1 have the same basic configuration, and the two light source units 20 (first light source unit 20A and second light source unit 20B) have the same basic configuration. Is a substrate having a plurality of light emitting elements 30, a band-shaped flexible substrate 40 on which a plurality of light emitting elements 30 are mounted, and a convex curved surface 55 extending in a curved shape in the length direction (circumferential direction). It is provided with a support member 50. In the present embodiment, the convex curved surface 55 has a shape curved in a semicircular shape in the length direction (circumferential direction) thereof.

As shown in FIGS. 1, 2, 3 and 4, in this embodiment, the flexible substrate 40 has a strip-shaped first flexible substrate 41 and a strip-shaped strip parallel to the first flexible substrate 41 in the width direction. A second flexible substrate 42 is used. In this state, the first flexible substrate 41 and the second flexible substrate 42 have one side ends 41g and 42g in the width direction adjacent to each other, and the other side ends 41h and 42h located on opposite sides of each other.

A plurality of first light emitting elements 31 as a plurality of light emitting elements 30 are mounted on the first flexible substrate 41 in the length direction thereof, and a plurality of first light emitting elements 31 as a plurality of light emitting elements 30 are mounted on the second flexible substrate 42 in the length direction thereof. A plurality of second light emitting elements 32 as light emitting elements 30 are mounted. The light emitting element 30 (the first light emitting element 31 and the second light emitting element 32) is each composed of an LED (light emitting diode) or the like, and in this embodiment, the peak wavelength of each of the light emitting elements 30 is located at 840 to 1000 nm. The detection light L2 (detection light L2a, L2b) composed of infrared light is emitted as divergent light. In this embodiment, since the target object Ob is often a fingertip or the like, infrared light (near infrared light of about 840 to 920 nm) in a wavelength range having high reflectance in the target object Ob (human body) is used as the detection light L2. Light) is used.

The board support member 50 has a structure in which the first board support member 51 and the second board support member 52 are overlapped in the Z-axis direction, and the first board support member 51 and the second board support member 52 are Z. It has a structure that is symmetrical with each other in the axial direction. The first substrate support member 51 is convex at the semicircular convex curved surface 515 forming the upper half of the convex curved surface 55 and the end portion of the convex curved surface 515 opposite to the side where the second substrate support member 52 is located. It is provided with a semicircular flange portion 516 protruding from the curved surface 515, and the first flexible substrate 41 is arranged so as to overlap the convex curved surface 515. In this embodiment, the other end portion 41h of the first flexible substrate 41 abuts on the flange portion 516, and the position of the first flexible substrate 41 in the width direction is defined. The second substrate support member 52 is convex at the semicircular convex curved surface 525 forming the lower half of the convex curved surface 55 and the end portion of the convex curved surface 525 opposite to the side where the first substrate support member 51 is located. It is provided with a semicircular flange portion 526 protruding from the curved surface 525, and the second flexible substrate 42 is arranged so as to overlap the convex curved surface 525. In this embodiment, the other end portion 42h of the second flexible substrate 42 abuts on the flange portion 526, and the position of the second flexible substrate 42 in the width direction is defined. In addition, indexes 59 indicating the angular direction are formed at equal angular intervals on the collar portions 516 and 526.

As shown in FIG. 4, in the first substrate support member 51, notches 511a and 511b are formed at both ends of the convex curved surface 515 in the circumferential direction, and as a result, the angle range in which the convex curved surface 515 is formed is , It is narrower than the angle range in which the collar 516 is formed. Similar to the first substrate support member 51, the second substrate support member 52 also has notches 521a and 521b formed at both ends of the convex curved surface 525 in the circumferential direction, and as a result, the convex curved surface 525 is formed. The angular range is narrower than the angular range in which the collar 526 is formed. The notches 511a, 511b, 521a, and 521b will be described later.

The light receiving unit 60 shown in FIG. 1 is composed of a photodiode, a phototransistor, or the like whose light receiving surface is directed to the detection target space 10R. In this embodiment, the light receiving unit 60 is a photodiode having a sensitivity peak in the infrared region . In this embodiment, the light receiving unit 60 is arranged at substantially the center position of the first light source unit 20A and the second light source unit 20B in the X-axis direction, and the first light source unit 20A and the second light source unit 20A and the second light source unit 20A in the Y-axis direction and the Z-axis direction. It is arranged at substantially the same position as the part 20B.

The optical position detection device 10 may include a reference light source 12R in which the light emitting unit is directed to the light receiving unit 60. Like the light emitting element 30, the reference light source 12R is composed of a light emitting element such as an LED (light emitting diode), and the reference light source 12R emits a reference light Lr composed of infrared light having a peak wavelength of 840 to 1000 nm. Emit as divergent light. However, the reference light Lr emitted from the reference light source 12R is received without being incident on the detection target space 10R due to the direction of the reference light source 12R, the light-shielding cover (not shown) provided on the reference light source 12R, and the like. It is designed to be incident on the part 60.

(Position Detection Method) FIG. 5 is an explanatory diagram showing a position detection principle in the optical position detection device 10 according to the first embodiment of the present invention, and FIGS. 5 (a) and 5 (b) show light intensity distributions. It is explanatory drawing and explanatory drawing of the method of acquiring the position information (direction information) in which a target object exists. FIG. 6 is an explanatory diagram showing a method of specifying the position of the target object Ob in the optical position detection device 10 according to the first embodiment of the present invention.

In the optical position detection device 10 of this embodiment, the detection light L2 is emitted from the light source unit 20 in order to detect the position of the target object Ob in the detection target space 10R. At that time, the light source driving unit 75 shown in FIG. 1 drives the light emitting element 30 so that the emission intensity changes monotonically from one end to the other end of the flexible substrate 40. Further, the plurality of first light emitting elements 31 mounted on the first flexible board 41 and the plurality of second light emitting elements 32 mounted on the second flexible board 42 are turned on at different timings, and the first light emitting element is turned on. The plurality of first light emitting elements 31 mounted on the flexible substrate 41 and the plurality of second light emitting elements 32 mounted on the second flexible substrate 42 are detected with intensity at which the intensities change monotonically in opposite directions. Emit L2.

More specifically, in the first period in which the plurality of first light emitting elements 31 are all turned on and all the second light emitting elements 32 are turned off, the high and low emission intensities are shown by arrows Pa in FIG. 4A. The emission intensity of the first light emitting element 31 is increased from one side end portion 41e in the length direction of the first flexible substrate 41 toward the other side end portion 41f. Therefore, in the first light intensity distribution L2Xa of the detection light L2 emitted from the light source unit 20 to the detection target space 10R in the first period, the angle at which one end 41e in the length direction of the first flexible substrate 41 is located. The light intensity is low in the direction, and from there, the light intensity is continuously increased in the angular direction in which the other side end portion 41f is located.

On the other hand, in the second period in which the plurality of second light emitting elements 32 are all turned on and all the first light emitting elements 31 are turned off, the high and low emission intensities are shown by arrows Pb in FIG. 2 From one side end 42e (the side where one side end 41e of the first flexible board 41 is located) to the other end 42f (the other end 41f of the first flexible board 41) in the length direction of the flexible board 42. The emission intensity of the second light emitting element 32 decreases toward the position side). Therefore, in the second light intensity distribution L2Xb of the detection light L2 emitted from the light source unit 20 to the detection target space 10R in the second period, the angle at which one side end portion 42e of the second flexible substrate 42 in the length direction is located. The light intensity is low in the direction, and from there, the light intensity is continuously reduced in the angular direction in which the other end portion 42f is located.

In performing such driving, in addition to the configuration in which the light source driving unit 75 supplies a predetermined drive current to each of the plurality of light emitting elements 30, the light emitting elements 30 are electrically connected in parallel on the flexible substrate 40, and a plurality of light emitting elements 30 are electrically connected in parallel. A configuration may be adopted in which the current value supplied to each of the light emitting elements 30 is limited by a resistor.

In this embodiment, as described below, the position of the target object Ob is detected by using the first light intensity distribution L2Xa and the second light intensity distribution L2Xb.

First, when the first light intensity distribution L2Xa is formed by the first light source unit 20A, the irradiation direction (angle direction) of the detection light L2 and the intensity of the detection light L2 are shown by line E1 in FIG. 5 (a). There is a linear relationship. When the second light intensity distribution L2Xb is formed by the first light source unit 20A, the irradiation direction (angle direction) of the detection light L2 and the intensity of the detection light L2 are shown by line E2 in FIG. 5 (a). There is a linear relationship.

Here, as shown in FIGS. 5 (b) and 6, it is assumed that the target object Ob exists in the direction of the angle θ when viewed from the central PE of the first light source unit 20A. In such a case, in the first period when the first light intensity distribution L2Xa is formed, the intensity of the detected light L2 at the position where the target object Ob exists is INTa. On the other hand, in the second period when the second light intensity distribution L2Xb is formed, the intensity of the detected light L2 at the position where the target object Ob exists is INTb. Therefore, the detection intensity of the light receiving unit 60 when the first light intensity distribution L2Xa is formed is compared with the detection intensity of the light receiving unit 60 when the second light intensity distribution L2Xb is formed, and the intensities INTa and INTb are compared. If the relationship is obtained, the angle θ (angle θ1) in the direction in which the target object Ob is located can be obtained with reference to the central PE of the first light source unit 20A.

If this operation is also performed in the second light source unit 20B and the angle θ (angle θ2) in the direction in which the target object Ob is located is obtained, the target object Ob is based on the central PE of the first light source unit 20A and the second light source unit 20B. The position of can be specified. Further, since the distance DS between the center PE of the first light source unit 20A and the center PE of the second light source unit 20B is fixed, the position detection unit 70 shown in FIG. 1 calculates the X coordinate and the Y coordinate of the target object Ob. can do. In this way, in acquiring the position information of the target object Ob in the detection target space 10R based on the detection result of the light receiving unit 60, for example, a microprocessor unit (MPU) is used as the position detection unit 70, thereby using the microprocessor unit (MPU). It is possible to adopt a configuration in which processing is performed according to execution of predetermined software (operation program). Further, the position detection unit 70 may adopt a configuration using hardware such as a logic circuit.

In the light source unit 20 (first light source unit 20A and second light source unit 20B), the detection intensity in the light receiving unit 60 when the first light intensity distribution L2Xa is formed by the first light emitting element 31 and the second light emitting element. The drive current and drive current when the first light source element 31 and the second light source element 32 are driven are set so that the detection intensity of the light receiving unit 60 when the second light intensity distribution L2Xb is formed by 32 is equal. The angle θ (angles θ1, θ2) in the direction in which the target object Ob is located may be obtained from the ratio or difference of the drive current when adjusted. Further, when the reference light source 12R shown in FIG. 1 is provided, the detection intensity of the light receiving unit 60 when the first light intensity distribution L2Xa is formed and the light receiving unit 60 of the reference light Lr emitted from the reference light source 12R. The comparison result with the detection intensity in the above, the detection intensity in the light receiving part 60 when the second light intensity distribution L2Xb is formed, and the detection intensity in the light receiving part 60 of the reference light Lr emitted from the reference light source 12R. The angle θ (angles θ1, θ2) in the direction in which the target object Ob is located may be obtained by using the comparison result of.

(Positioning of Flexible Substrate 40) In the optical position detection device 10 of this embodiment, since the position of the target object Ob is detected by the above method, high accuracy is required for the position and orientation of the light emitting element 30. Therefore, in the present embodiment, in the first substrate support member 51, the first flexible substrate 41 is arranged by using the notches 511a and 511b formed at both ends of the convex curved surface 515 in the circumferential direction, and the second substrate support member is arranged. In 52, the second flexible substrate 42 is arranged by utilizing the notches 521a and 521b formed at both ends of the convex curved surface 525 in the circumferential direction.

More specifically, when the first flexible substrate 41 is arranged on the convex curved surface 515 of the first substrate support member 51, as shown in FIG. 4A, the end portion of the convex curved surface 515 of the first substrate support member 51 After aligning one side end 41e of the first flexible substrate 41 with the boundary portion between the first flexible substrate 41 and the notch 511a, the first flexible substrate 41 is overlapped with the convex curved surface 515, and the first flexible substrate 41 and the convex curved surface 515 are bonded to each other. Fix with an agent or the like. In this state, the other end portion 41h of the first flexible substrate 41 is in contact with the flange portion 516, and the first flexible substrate 41 is accurately positioned in the width direction. Here, when the length dimension of the first flexible substrate 41 is too large compared to the length dimension of the convex curved surface 515, the other end portion 41f of the first flexible substrate 41 is bent and inserted into the notch 511b. Therefore, unlike the case where the one-side end 41e and the other end 41f of the first flexible substrate 41 are aligned with the convex curved surface 515, the first flexible substrate 41 partially floats from the convex curved surface 515. Does not occur.

Further, as shown in FIG. 4B, after aligning the one-sided end portion 42e of the second flexible substrate 42 with the boundary portion between the end portion of the convex curved surface 525 of the second substrate support member 52 and the notch 521a. , The second flexible substrate 42 is superposed on the convex curved surface 525, and the second flexible substrate 42 and the convex curved surface 525 are fixed with an adhesive or the like. In this state, the other end portion 42h of the second flexible substrate 42 is in contact with the flange portion 526, and the second flexible substrate 42 is accurately positioned in the width direction. Here, when the length dimension of the second flexible substrate 42 is too large compared to the length dimension of the convex curved surface 525, the other end portion 42f of the second flexible substrate 42 is bent and inserted into the notch 521b. Therefore, unlike the case where the one-side end 42e and the other end 42f of the second flexible substrate 42 are aligned with the convex curved surface 525, the second flexible substrate 42 partially floats from the convex curved surface 525. Does not occur.

(Main effects of this embodiment) As described above, in the optical position detection device 10 of this embodiment, a plurality of light emitting elements 30 are mounted on the strip-shaped flexible substrate 40, and the plurality of light emitting elements 30 are each mounted on the strip-shaped flexible substrate 40. The detection light L2 is emitted. Therefore, the position of the target object Ob in the emission space can be detected based on the result of receiving the detection light L2 reflected by the target object Ob located in the emission space of the detection light L2 by the light receiving unit 60. Here, since the flexible substrate 40 is arranged so as to overlap the convex curved surface 55 of the substrate support member 50, the flexible substrate 40 is curved in a predetermined shape along the convex curved surface 55. Therefore, since the detection light L2 can be emitted from the position where the flexible substrate 40 is arranged over a wide angle range, the position of the target object Ob in a wide area can be detected. Further, since the flexible substrate 40 may be curved along the convex curved surface 55 of the substrate support member 50, it does not require a great deal of time and effort to accurately bend the flexible substrate 40, and the flexible substrate 40 is curved. It is also easy to hold in shape.

Further, the substrate support member 50 is notched at a position overlapping the end portion of the flexible substrate 40 (the other side end portion 41f of the first flexible substrate 41 and the other side end portion 42f of the second flexible substrate 42) (first substrate). A notch 511b of the support member 51 and a notch 521b) of the second substrate support member 52 are formed. Therefore, when one end of the flexible substrate 40 (one end 41e of the first flexible substrate 41 and one end 42e of the second flexible substrate 42) is aligned, the other end (first flexible) is aligned. The other end 41f of the substrate 41 and the other end 42f of the second flexible substrate 42) can be inserted into the notches 511b and 521b. Therefore, even if the size of the flexible substrate 40 is too large, the flexible substrate 40 can be placed on the convex curved surface 55 of the substrate support member 50, and the flexible substrate 40 does not float. Therefore, each of the plurality of light emitting elements 30 can be accurately oriented in a predetermined direction in a predetermined direction. Therefore, each of the plurality of light emitting elements 30 can emit the detection light L2 in a predetermined direction, so that the position of the target object Ob can be detected with high accuracy.

In particular, in the case of a method in which the emission intensities of the plurality of light emitting elements 30 are different to form the emission intensity as in the present embodiment, high accuracy is required for the positions and orientations of the plurality of light emitting elements 30, but the present embodiment requires high accuracy. For example, since the dimensional variation of the flexible substrate 40 can be absorbed by using the notches 511b and 521b, the flexible substrate 40 can be arranged appropriately. Therefore, since it is possible to obtain high accuracy in the positions and orientations of the plurality of light emitting elements 30, it is possible to accurately detect the position of the target object Ob.

[Embodiment 2] FIG. 7 is an explanatory view of the light source unit 20 of the optical position detection device 10 according to the second embodiment of the present invention, and FIGS. 7 (a) and 7 (b) show the light source unit 20. It is a perspective view and an exploded perspective view. FIG. 8 is an exploded perspective view of the light source unit 20 of the optical position detection device 10 according to the second embodiment of the present invention, which is further disassembled. FIG. 9 is an explanatory view showing a state in which the second flexible substrate 42 is attached to the second substrate support member 52 in the optical position detection device 10 according to the second embodiment of the present invention. b) and (c) are explanatory views showing how the second flexible substrate 42 is positioned in various states. Since the basic configuration of this embodiment is the same as that of the first embodiment, the common parts are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 7 and 8, the light source unit 20 used in the optical position detection device 10 of the present embodiment also has a plurality of light emitting elements 30 and a plurality of light emitting elements, as in the first embodiment. It includes a strip-shaped flexible substrate 40 on which 30 is mounted, and a substrate support member 50 having a convex curved surface 55 extending in a curved shape in the length direction.

In this embodiment, as the flexible substrate 40, a strip-shaped first flexible substrate 41 and a strip-shaped second flexible substrate 42 parallel to the first flexible substrate 41 in the width direction are used. Here, the first flexible substrate 41 is divided into a flexible substrate 411 and a flexible substrate 412 in the length direction, and the flexible substrates 411 and 412 are arranged in series (column) in the length direction. A plurality of first light emitting elements 31 are mounted on the flexible substrates 411 and 412 in the length direction. Like the first flexible substrate 41, the second flexible substrate 42 is also divided into a flexible substrate 421 and a flexible substrate 422 in the length direction, and the flexible substrates 421 and 422 are in series (column) in the length direction. Have been placed. A plurality of second light emitting elements 32 are mounted on the flexible substrates 421 and 422 in the length direction.

Corresponding to such a configuration of the flexible substrate 40, in the first substrate support member 51, notches 511a and 511b are formed at both ends of the convex curved surface 515 in the circumferential direction, and the convex curved surface 515 is formed in the length direction. A notch 511c is also formed in the center of the. Further, also in the second substrate support member 52, as in the case of the first substrate support member 51, notches 521a and 521b are formed at both ends of the convex curved surface 525 in the circumferential direction, and the convex curved surface 525 is formed in the length direction. A notch 521c is also formed in the center. Therefore, in this embodiment, as described below with reference to FIG. 9, the first flexible substrate 41 (flexible substrate 411, 412) is used by utilizing the notches 511a, 511b, 511c and the notches 521a, 521b, 521c. ) And the second flexible substrate 42 (flexible substrates 421, 422) can be properly arranged in the length direction.

First, in the form shown in FIG. 9A, when the second flexible substrate 42 is arranged on the convex curved surface 525 of the second substrate support member 52, one side end portion 42e of the flexible substrate 421 is set as the end portion of the convex curved surface 525. After aligning with the boundary portion with the notch 521a, the flexible substrate 421 is overlapped with the convex curved surface 525, and the flexible substrate 421 and the convex curved surface 525 are fixed with an adhesive or the like. At that time, if the length dimension of the flexible substrate 421 is too large compared to the length dimension of the convex curved surface 525 (the dimension from the end to the notch 511c), the other end portion 42a of the flexible substrate 421 is bent. Insert into the notch 521c. Therefore, unlike the case where the one-side end portion 42e and the other-side end portion 42a of the flexible substrate 421 are aligned with the convex curved surface 525, problems such as the flexible substrate 421 partially floating from the convex curved surface 525 do not occur. Regarding the flexible substrate 422, after aligning the other end portion 42f with the boundary portion between the end portion of the convex curved surface 525 and the notch 521b, the flexible substrate 422 is overlapped with the convex curved surface 525, and the flexible substrate 422 and the convex curved surface are overlapped. Fix the 525 with an adhesive or the like. At that time, if the length dimension of the flexible substrate 422 is too large compared to the length dimension of the convex curved surface 525 (the dimension from the end to the notch 511c), the one end portion 42b of the flexible substrate 422 is bent. Insert into the notch 521c. Therefore, unlike the case where the one-side end portion 42b and the other-side end portion 42f of the flexible substrate 422 are aligned with the convex curved surface 525, problems such as the flexible substrate 422 partially floating from the convex curved surface 525 do not occur. Therefore, each of the second light emitting elements 32 can be accurately oriented in a predetermined direction in a predetermined direction. Although not shown, the same applies when the first flexible substrate 41 (flexible substrate 411, 412) is provided on the convex curved surface 515.

Next, in the form shown in FIG. 9B, when the second flexible substrate 42 is arranged on the convex curved surface 525 of the second substrate support member 52, one side end 42e of the flexible substrate 421 is changed to the end portion of the convex curved surface 525. After aligning the flexible substrate 421 with the notch 521a, the flexible substrate 421 is overlapped with the convex curved surface 525, and the flexible substrate 421 and the convex curved surface 525 are fixed with an adhesive or the like. At that time, if the length dimension of the flexible substrate 421 is too large compared to the length dimension of the convex curved surface 525, the other end portion 42a of the flexible substrate 421 is bent and inserted into the notch 521c. Therefore, unlike the case where the one-side end portion 42e and the other-side end portion 42a of the flexible substrate 421 are aligned with the convex curved surface 525, problems such as the flexible substrate 421 partially floating from the convex curved surface 525 do not occur. Regarding the flexible substrate 422, after aligning one side end portion 42b with the boundary portion between the end portion of the convex curved surface 525 and the notch 521c, the flexible substrate 422 is overlapped with the convex curved surface 525, and the flexible substrate 422 and the convex curved surface are overlapped. Fix the 525 with an adhesive or the like. At that time, if the length dimension of the flexible substrate 422 is too large compared to the length dimension of the convex curved surface 525, the other end portion 42f of the flexible substrate 422 is bent and inserted into the notch 521b. Therefore, unlike the case where the one-side end portion 42b and the other side end portion 42f of the flexible substrate 422 are aligned with the convex curved surface 525, problems such as the flexible substrate 422 partially floating from the convex curved surface 525 do not occur. Although not shown, the same applies when the first flexible substrate 41 (flexible substrate 411, 412) is provided on the convex curved surface 515.

Next, in the form shown in FIG. 9 (c), when the second flexible substrate 42 is arranged on the convex curved surface 525 of the second substrate support member 52, the position of the light emitting element 30 mounted on the flexible substrate 421 is used as a reference. The flexible substrate 421 is superposed on the convex curved surface 525, and the flexible substrate 421 and the convex curved surface 525 are fixed with an adhesive or the like. At that time, if the length dimension of the flexible substrate 421 is too large compared to the length dimension of the convex curved surface 525, the one side end portion 42e of the flexible substrate 421 is bent and inserted into the notch 521a, and the flexible substrate 421 is inserted. Bend the other end 42a and insert it into the notch 521c. Therefore, unlike the case where the one side end portion 42e and the other side end portion 42a of the flexible substrate 421 are aligned with the convex curved surface 525, problems such as the flexible substrate 421 partially floating from the convex curved surface 525 do not occur. Regarding the flexible substrate 422, the flexible substrate 422 is superposed on the convex curved surface 525 with reference to the position of the light emitting element 30 mounted on the flexible substrate 422, and the flexible substrate 422 and the convex curved surface 525 are fixed with an adhesive or the like. At that time, if the length dimension of the flexible substrate 422 is too large compared to the length dimension of the convex curved surface 525, the one side end portion 42b of the flexible substrate 422 is bent and inserted into the notch 521c, and the flexible substrate 422 is inserted. Bend the other end 42f and insert it into the notch 521b. Therefore, unlike the case where the one-side end portion 42b and the other side end portion 42f of the flexible substrate 422 are aligned with the convex curved surface 525, problems such as the flexible substrate 422 partially floating from the convex curved surface 525 do not occur. Although not shown, the same applies when the first flexible substrate 41 (flexible substrate 411, 412) is provided on the convex curved surface 515.

[Embodiment 3] FIG. 10 is an explanatory view of a light source unit 20 of the optical position detection device 10 according to the third embodiment of the present invention, and FIGS. 10 (a) and 10 (b) show the light source unit 20. It is a perspective view and an exploded perspective view. FIG. 11 is an explanatory view showing a detailed configuration of the light source unit 20 of the optical position detection device 10 according to the third embodiment of the present invention, and FIGS. 11 (a) and 11 (b) show the light source unit 20 in more detail. It is a disassembled disassembled perspective view and the cross-sectional view of a main part. Since the basic configuration of this embodiment is the same as that of the first embodiment, the common parts are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIGS. 10 and 11, the light source unit 20 used in the optical position detection device 10 of the present embodiment also has a plurality of light emitting elements 30 and a plurality of light source units 20 as in the first and second embodiments. It includes a strip-shaped flexible substrate 40 on which a light emitting element 30 is mounted, and a substrate support member 50 having a convex curved surface 55 extending in a curved shape in the length direction. In this embodiment, as the flexible substrate 40, a strip-shaped first flexible substrate 41 and a strip-shaped second flexible substrate 42 parallel to the first flexible substrate 41 in the width direction are used. Here, the first flexible substrate 41 is divided into a flexible substrate 411 and a flexible substrate 412 in the length direction, and the flexible substrates 411 and 412 are arranged in series (column) in the length direction. Further, a plurality of first light emitting elements 31 are mounted on the flexible substrates 411 and 412 in the length direction. Like the first flexible substrate 41, the second flexible substrate 42 is also divided into a flexible substrate 421 and a flexible substrate 422 in the length direction, and the flexible substrates 421 and 422 are in series (column) in the length direction. Have been placed. Further, a plurality of second light emitting elements 32 are mounted on the flexible substrates 421 and 422 in the length direction.

Corresponding to such a configuration, in the first substrate support member 51, notches 511a and 511b are formed at both ends of the convex curved surface 515 in the circumferential direction, and notches are also formed in the center of the convex curved surface 515 in the length direction. 511c is formed. Further, also in the second substrate support member 52, as in the case of the first substrate support member 51, notches 521a and 521b are formed at both ends of the convex curved surface 525 in the circumferential direction, and the convex curved surface 525 is formed in the length direction. A notch 521c is also formed in the center. Therefore, in the present embodiment, as described with reference to FIG. 9 in the second embodiment, the lengths of the first flexible substrate 41 (flexible substrate 411, 412) and the second flexible substrate 42 (flexible substrate 421, 422). It is possible to absorb dimensional variation in the direction.

Further, in the present embodiment, the first substrate support member 51 has a notch 511d formed at a position overlapping the one side end portion 41g in the width direction of the first flexible substrate 41, and the second substrate support member 52 has a second portion. 2 A notch 521d is formed at a position overlapping the one side end portion 42g in the width direction of the flexible substrate 42. Therefore, when the first substrate support member 51 and the second substrate support member 52 are overlapped with each other, a slit-shaped recess is formed between the convex curved surface 515 and the convex curved surface 525 by the notches 521d and 521d.

Therefore, in the present embodiment, as described with reference to FIG. 9 in the second embodiment, the cutouts 511a, 511b, 511c and the cutouts 521a, 521b, 521c are used to make the first flexible substrate 41 and the second flexible substrate 41 and the second. The flexible substrate 42 can be properly arranged in the length direction, and the first flexible substrate 41 and the second flexible substrate 42 can be properly arranged in the width direction by using the notches 511d and 521d as described below. Can be placed in. That is, in the first flexible substrate 41, when the other end portion 42h of the flexible substrates 421 and 422 in the width direction is brought into contact with the flange portion 526 and positioned in the width direction of the flexible substrates 421 and 422, the flexible substrates 421 and 422 If the width dimension of is too large compared to the width dimension of the convex curved surface 525, the flexible substrates 421 and 422 on one side, 42 g, are bent and inserted into the notch 521d. Therefore, in the present embodiment, even if the second flexible substrate 42 has dimensional variations in the width direction, problems such as the flexible substrate 422 partially floating from the convex curved surface 525 do not occur. Therefore, each of the second light emitting elements 32 can be accurately oriented in a predetermined direction in a predetermined direction. Although the description is omitted, the same applies to the second flexible substrate 42.

In this embodiment, the notches 511d and 521d are added to the configuration described in the second embodiment, but the notches 511d and 521d may be added to the configuration described in the first embodiment.

[Other Embodiments] In the above embodiment, two flexible substrates 40 are arranged in parallel, but when the light emitting elements 30 are arranged in two rows on one flexible substrate 40. The present invention may be applied. Further, in the above embodiment, the first light emitting element 31 is lit in the first period and the second light emitting element 32 is lit in the second period, but it is common to the first period and the second period. The light emitting element 30 may be lit. In this case, if the drive current supplied to the light emitting element 30 is changed in the first period and the second period, the first light intensity distribution L2Xa and the second light intensity distribution are used. It is possible to form L2Xb.

[Structure of Equipment with Position Detection Function] The optical position detection device 10 described with reference to FIGS. 1 to 11 can be used to configure equipment with a position detection function, etc., and visually recognizes the visual recognition surface constituent members. If the detection light L2 is emitted along the surface, the position of the target object Ob located on the viewing surface side can be detected. Examples of such a device with a position detection function include a screen device with a position detection function described with reference to FIG. 12, a projection display device with a position detection function described with reference to FIG. 13, and a digital signage with a position detection function. , Amusement equipment with position detection function, etc. can be mentioned.

(Configuration Example of Device with Position Detection Function 1) An example in which a screen device with a position detection function is configured as a device with a position detection function will be described with reference to FIG. FIG. 12 is an explanatory view of a screen device with a position detection function (device with a position detection function) to which the present invention is applied, and FIGS. 12 (a) and 12 (b) are views of the screen device with a position detection function from diagonally above. It is explanatory drawing which shows the state schematically, and explanatory drawing which shows the state which it looks at the side view typically. In the screen device with a position detection function of this embodiment, the configuration of the optical position detection device 10 is the same as the configuration described with reference to FIGS. 1 to 11, and thus the description thereof will be omitted.

The screen device 8 with position detection function (device 1 with position detection function) shown in FIGS. 12 (a) and 12 (b) is from an image projection device 250 (image generator) called a liquid crystal projector or a digital micromirror device. It includes a screen 80 (visual surface component) on which an image is projected, and an optical position detection device 10 described with reference to FIGS. 1 to 11. The image projection device 250 magnifies and projects the image display light Pi toward the screen device 8 from the projection lens system 210 provided on the front surface portion 241 of the housing 240. Therefore, in the screen device 8 with the position detection function, the screen surface 8a on which the image is projected on the screen 80 constitutes a visible surface on which information is visually recognized. Here, the optical position detection device 10 is arranged on the side of the screen surface 8a (visual recognition surface) of the screen 80 (visual surface component), and emits the detection light L2 along the screen surface 8a.

In the screen device 8 with a position detection function configured in this way, the detection target space 10R overlaps with the area (image display area 200R) on which the image is projected by the image projection device 250 when viewed from the normal direction with respect to the screen 80. There is. Therefore, in the projection type display device 200 with a position detection function of the present embodiment, for example, if the target object Ob such as a fingertip is brought close to a part of the image projected on the screen 80, the position of the target object Ob is imaged. It can be used as input information such as a switching instruction of.

In this embodiment, as the screen device 8 with a position detection function, a screen device for a projection type display device in which an image is projected from the image projection device 250 has been described, but an optical position detection device 10 is used on a screen for an electronic whiteboard. May be provided to form a screen device with a position detection function for an electronic blackboard.

(Configuration Example 2 of Device with Position Detection Function) An example in which a projection display device with a position detection function is configured as a device with a position detection function will be described with reference to FIG. FIG. 13 is an explanatory diagram of a projection type display device with a position detection function (equipment with a position detection function) to which the present invention is applied, and FIGS. 13 (a) and 13 (b) show a projection type display device with a position detection function. It is explanatory drawing which shows the state seen from obliquely above schematically, and is explanatory drawing which shows the state seen from the side direction typically. In the projection display device with a position detection function of this embodiment, the configuration of the optical position detection device 10 is the same as the configuration described with reference to FIGS. 1 to 11, so that the common parts are the same. References are given and their description is omitted.

The projection display device 200 with a position detection function (device 1 with a position detection function) shown in FIGS. 13 (a) and 13 (b) is an image projection device 250 (image generator) called a liquid crystal projector or a digital micromirror device. ) And the optical position detection device 10 described with reference to FIGS. 1 to 11. The image projection device 250 magnifies and projects the image display light Pi toward the screen 80 from the projection lens system 210 provided on the front surface 201 of the housing 240. In the projection type display device 200 with a position detection function, a visible surface on which information is visually recognized is configured by a screen surface 8a on which an image is projected on the screen 80.

In the projection type display device 200 with a position detection function, the optical position detection device 10 is mounted on an image projection device 250 arranged on the screen surface 8a (visual surface) side of the screen 80. Therefore, the optical position detection device 10 emits the detection light L2 from the image projection device 250 along the screen surface 8a (visual surface) of the screen 80 (visual surface component). Further, the optical position detection device 10 detects the detection light L3 reflected by the target object Ob in the image projection device 250.

In the screen device 8 with a position detection function configured in this way, the detection target space 10R overlaps with the area (image display area 200R) on which the image is projected by the image projection device 250 when viewed from the normal direction with respect to the screen 80. There is. Therefore, in the projection type display device 200 with a position detection function of the present embodiment, for example, if the target object Ob such as a fingertip is brought close to a part of the image projected on the screen 80, the position of the target object Ob is imaged. It can be used as input information such as a switching instruction of.

1 ... Equipment with position detection function, 8 ... Screen device (equipment with position detection function), 10 ... Optical position detection device, 10R ... Detection target space (detection light emission space), 20 ... Light source unit, 20A ... 1st light source, 20B ... 2nd light source, 30 ... light emitting element, 31 ... 1st light emitting element, 32 ... 2nd light emitting element, 40 ... flexible substrate, 41 ... 1st flexible Board, 42 ... 2nd flexible board, 50 ... board support member, 51 ... 1st board support member, 52 ... 2nd board support member, 55, 515, 525 ... convex curved surface, 60 ... light receiving part , 70 ... Position detection unit, 200 ... Projection type display device with position detection function, 511a, 511b, 511c, 511d, 521a, 521b, 521c, 521d ... Notch, 516, 526 ... Target object