Bone conduction speaker and compound vibration device thereof

The present invention relates to speaker improvements based on bone conduction and its components, in particular to a loudspeaker based on bone conduction and its device for producing composite vibrations, with a frequency response of the speaker based on bone conduction improved by a device for generating composite vibrations, which It consists of vibrating plates and vibrating conductive plates.

Background of the Invention [0002] Usually sounds are heard thanks to airborne vibrations reaching the eardrum through the mouth of the external auditory canal, and the vibrations of the eardrum control the human auditory nerves, making the person feel acoustic vibrations. In use, the existing bone conduction speaker transmits vibrations through human skin, subcutaneous tissue and bones to the human auditory nerves, making the person hear the sounds.

[0003] When an existing bone-conduction loudspeaker acts as a result of vibration of the vibrating plate, the housing body to which the vibrating plate is fixed by means of the fastening element also vibrates together with the vibrating plate, therefore, when the body of the ear touches the area behind the ear mantles, cheeks, foreheads or other parts, vibrations are transmitted through the bones, making the person clearly hear the sounds.

[0004] Frequency response curves generated by bone conduction based loudspeakers in existing vibration devices are shown by two solid lines in Figure 4. Ideally, the loudspeaker frequency response curve should be flat like a straight line, and the flat part of the curve should be as wide as possible, which ensures better quality of the tone received by human ears. However, the frequency response curves of existing bone conduction based speakers shown in Figure 4 are imperfect due to excessively high resonant peaks, either in the low frequency region or in the high frequency region, which limits the tone quality of the speakers based on bone conduction. It is very difficult to improve the tone quality of existing bone conduction loudspeakers containing existing vibration devices. Therefore, existing technology should be improved and developed.

[0005] EP 1603362 A1 discloses a device based on bone conduction which, when used in particular in a telephone handset based on bone conduction, is capable of obtaining enough sound, and not only when it comes to sound transmitted by the bone, but also the sound of vibrating air to ensure clear sound reception. The bone conduction based device comprises a bone conduction device assembly and a housing accommodating a device assembly therein to act as a vibrating section, and characterized in that the compliance means, such as the waviness, are located along the peripheral edge of the vibrating surface of the housing containing the a device based on bone conduction.

[0006] WO2010 / 110713 A1 discloses a bone conduction transducer comprising a first seismic mass and a second seismic mass connected to each other by means of a first spring suspension, and wherein the first mass and the first spring suspension form the first mechanical resonance f1 in the low range The second mechanical resonance f2 arises in the high frequency range as a result of the interaction between the second mass and the compatibility of the second spring inserted between the second mass and the skull.

SUMMARY OF THE INVENTION The object of the present invention is to provide a speaker based on bone conduction and its device for generating composite vibrations, to improve vibrating parts in existing loudspeakers based on bone conduction and moreover to improve the frequency response of a speaker based on bone conduction through the use of a device for the production of bone composite vibrations consisting of a vibrating plate and a vibrating conductive plate, which leads to a more flat frequency response and a wider diapason of acoustic sounds.

[0008] The object is achieved by a device for generating composite vibrations as defined in claim 1 and a speaker based on bone conduction as defined in claim 14. Further embodiments are defined by the dependent claims.

[0009] The technical schemes of the present invention are summarized below.

[0010] The device for generating a vibration of a loudspeaker based on bone conduction comprises a vibrating conductive plate and a vibrating plate. The vibrating conductor plate is positioned as the first torus and at least the first two rods in the first torus converge in the middle of the first torus. The vibration plate is positioned as a second torus and at least two second rods in the second torus converge in the middle of the second torus. The vibrating conductive plate is attached to the vibrating plate, the first torus is attached to the magnetic system, and the voice coil, which is driven by the magnetic system, is attached to the second torus.

In a device for generating composite vibrations, the magnetic system includes a bottom plate, a ring magnet located on the bottom plate, an inner magnet which is located concentrically inside the ring magnet, an inner magnetic conductive plate positioned on the inner magnet and an annular magnetic conductor placed on the ring magnet . The reinforcement ring is located on an annular magnetic conductive plate and configured to attach the first torus. The voice coil is positioned between the inner magnetic conductive plate and the annular magnetic plate.

[0012] In a device for generating composite vibrations, the number of both first bars and second bars has been set equal to three.

[0013] In a device for generating composite vibrations, both the first rods and the second rods are straight rods.

[0014] In the device for generating composite vibrations there is an indentation which corresponds to a vibrating conductive plate and is located in the middle of the vibrating plate.

[0015] In a device for producing composite vibration, the first bars of the vibrating conductive plate are alternated with the second bars of the vibrating plate.

[0016] In a device for generating composite oscillations, the angles contained between the alternating first and second bars are 60 degrees.

In a device for producing composite vibrations, the vibrating conductor plate is made of stainless steel and has a thickness of 0.1-0.2 mm, each of the first bars of the vibrating conductive plate having a width of 0.5 - 1.0 mm, and each of the the second bars of the vibration plate has a width of 1.6 - 2.6 mm and a thickness of 0.8 - 1.2 mm.

The device for generating composite vibrations includes a plurality of vibrating conductive plates and a plurality of vibrating plates, the elements being attached to one another by means of their means and / or toruses.

[0019] The bone conduction based loudspeaker comprises any device for generating composite vibrations as set out above.

[0020] In the bone conduction loudspeaker and the vibrator unit mentioned in the present invention, the vibrating plate and the vibrating conductor plate are attached to each other, which can be done using a simple method and at a low cost. Also, since the two vibrating parts in a device for generating composite vibrations can regulate both the low frequency region and the high frequency region, the resulting frequency response is more flat and the diapason is wider and thus avoids the problem of stepped frequency responses or weak sound caused by a single device for generating vibrations.

BRIEF DESCRIPTION OF THE DRAWINGS [0021]

Figure 1 is a longitudinal section of a speaker based on bone conduction according to the present invention.

Figure 2 is a perspective view of the vibrating portions of the bone conduction speaker of the present invention.

Figure 3 is a perspective view of a bone-guided disassembled speaker unit according to the present invention.

Figure 4 shows the bone-frequency response curves of a loudspeaker based oscilloscope with a prior art vibration device.

Figure 5 shows the bone-frequency response curves of a loudspeaker based oscillating device according to the present invention.

Figure 6 is a perspective view of a bone conduction loudspeaker according to the present invention.

EXAMPLE OF CARRYING OUT THE INVENTION [0022] A detailed description of embodiments of the present invention is shown below in connection with the accompanying drawings.

[0023] As shown in Figure 1 and Figure 3, the device for generating a vibratory oscillation based oscillation complex provided in the present invention comprises: a portion of a vibration consisting of a vibrating conductive plate 1 and a vibrating plate 2. The vibrating conductive plate 1 is positioned as a first torus 111, in which the first first bars 112 converge in the center of the first torus, and the convergence center is attached to the center of the vibrating plate 2. The center of the vibrating plate 2 is provided with an indentation 120 that corresponds to the center of convergence and the first rods. The vibration plate 2 comprises a second torus 121, which has a smaller radius than the vibrating conductor plate 1, as well as three second rods 122, each of which is thicker and wider than any of the first bars 112. After assembly, the first bars 112 and the second rods 122 are offset from each other with a 60-degree offset angle, as shown in figure 2, but the present invention is not limited thereto. Preferably, both the first and second rods are straight bars.

[0024] Obviously, both the number of first bars and the number of second bars can be greater than two. For example, if there are two first bars and two second rods, these bars can be arranged symmetrically; however, the most economical construction is a structure with three first bars and three second rods, but the present invention is not limited in this way and there may be four, five or more first bars, or four, five or more second rods that form a spoke structure.

The vibrating conductive plate 1, which is very thin and therefore more flexible, is trapped in the center of the indentation 120 of the vibrating plate 2. The voice coil 8 is attached to the bottom of the second torus 121 of the vibrating plate 2. The device for generating vibrations folded in The present invention also comprises a bottom plate 12 on which an annular magnet 10 is arranged, and an inner magnet 11 concentrically positioned inside the annular magnet 10. The conducting magnet 9 is positioned on top of the inner magnet 11 and the conductive magnet 7 is positioned on the inner magnet 11 an annular magnet 10. The reinforcing ring 6 is attached above the conductor 7 of the annular magnet,and the first torus 111 of the vibrating conductive plate 1 is permanently connected to the reinforcing ring 6. The entire device for generating composite vibrations is connected to the environment by means of a panel 13 which is permanently connected to the convergence center of the vibrating conductive plate 1 and is permanently trapped in both vibrating means conductive plate 1 and vibration plate 2.

[0026] It should be noted that there may be a plurality of vibrating conductive plates and a plurality of vibrating plates, which elements are attached to each other either through their means or through their centers and edges alternately, thus forming a multi-layered vibration structure corresponding to different frequency response ranges. , thus obtaining a vibration unit of a high-quality tone handset with a gamma range and full frequency range, despite higher costs.

[0027] As such, the bone conduction loudspeaker according to the present invention comprises a magnetic arrangement consisting of a conducting plate 7 of a ring magnet, a ring magnet 10, a lower plate 12, an inner magnet 11 and a conducting plate 9 of the inner magnet. Since the changes in the audio current in the oscillating coil 8 cause changes in the induced magnetic field, the voice coil 8 vibrates as a result of the interaction of the magnetic circuit. The device for generating composite vibrations is connected to the magnetic system via a sealing ring 6. The bone conduction based speaker is connected to the environment by means of a panel 13 to transmit vibrations to the human bone.

cheeks or the forehead of people and in this way the sounds are picked up by people. A complete product that is a bone conduction-based speaker is shown in Figure 6.

which is a perfectly flat frequency response curve with resonance peaks in frequencies audible to human ears. In this way, the device for generating composite vibrations broadens the ranges of resonance vibrations and is beneficial in generating ideal sounds.

[0030] In a preferred embodiment which is not intended to limit the present invention, it has been assumed that the vibrating conductor plate is made of stainless steel and has a thickness of 0.1 - 0.2 mm, and when the first bars of the vibrating conductive plate comprise three straight rods, each of which has a width

0.5-1.0 mm, the resonance peak of the low frequency speaker based on bone conduction is located between 300 Hz and 900 Hz. When the second bars of the vibration plate include three straight rods, each having a width between 1.6 mm and 2.6 mm and a thickness between 0.8 and 1.2 mm, the resonant peak of the high frequency speaker based on the bone conduction is located between 7500 Hz and 9500 Hz. Also, the design of the vibrating conductive plate and the vibrating plate is not limited to three straight rods, provided that the designs of the vibrating conductive plate and the vibratory plate provide adequate flexibility for both the vibrating conductive plate and the vibrating plate, and cross-shaped rods and other bar structures are also suitable. . Of course, with a larger number of components for generating complex vibrations, more resonance peaks will be obtained, and the adjusted frequency response curve will be more flat and the speaker diapason will be wider. In this way, in a preferred embodiment, it is also possible that more than two vibrating conductive plates or vibrating plates or similar parts overlap, but this increases the cost.

[0031] The apparatus for generating composite vibrations is used in a loudspeaker based on bone conduction, in particular in headphones based on bone conduction. Accordingly, a bone conduction loudspeaker using the above-described construction is within the protection scope of the present invention.

[0032] The bone conduction loudspeaker and its device for creating composite vibrations presented in the present invention are easy to manufacture at low cost. Thanks to the two vibrating parts, i.e. the vibrating conductive plate and the vibrating plate, the device for generating composite vibrations can regulate the low frequency range as well as the high frequency range as shown in FIG. 5, so that the obtained frequency response is flatter and the speaker diaphragm is wider. avoiding the problems of stepped frequency response and weak sounds caused by a single vibration device and thus the use of a bone conduction speaker according to the invention has been extended.

[0033] In the state of the art the vibrating parts are made without fully considering the influence of each part on the frequency response, therefore, although the vibrating parts in the prior art could have a similar appearance compared to the products described in the present invention, the vibrating parts in the prior art will be they generated stepped frequency response or weak sound. Due to the improper fit between the vibration portions in the prior art, the resonant peak may be beyond the human-readable frequency range, which is between 20 Hz and 20 kHz. In this way, the frequency response curve generally appears with only one sharp resonance peak, as shown in Figure 4, which means quite a poor tone quality.

[0034] It should be clearly indicated that the above detailed description of a preferred embodiment should not be construed to limit the scope of the present invention. The scope of the present invention should be defined by the appended claims.

Shenzhen Voxtech Co., Ltd Representative:

PL-PAT-2012-928

EP 2 773 133 B1