JP2014175947A - Sound transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound transmission device which includes a small number of components, has a simplified configuration, and is small in size and light in weight.SOLUTION: A sound transmission device comprises: diaphragms 111 formed in a flat plate-like shape: a mounting unit 120 which is to be mounted on a human body in a state where plate surfaces of the diaphragms 111 are brought into contact with ears of the human body; and a driving unit 130 for generating driving signals which vibrate the diaphragms 111. The diaphragms 111 are flexible, and brought into contact with the ears of the human body while being deformed when mounted on the human body with the mounting unit 120.

Description

  The present invention relates to an audio transmission device that transmits audio using the inverse piezoelectric effect.

  A headphone using a piezoelectric film is disclosed in Patent Document 1. In the headphone disclosed in Patent Document 1, a piezoelectric film is disposed in a case, and air conduction sound generated by the piezoelectric film is transmitted to the ear. Therefore, the piezoelectric film itself does not contact the ear.

  A headset using a vibrator and a diaphragm is disclosed in Patent Document 2. In the headset of Patent Document 2, air conduction sound generated by the diaphragm is transmitted to the ear. The diaphragms of Patent Document 2 are arranged at a predetermined distance without being completely in contact with the ears, and this space enables high-quality sound reproduction over a wide band.

  In addition to the above-described documents, there is no general audio headphone in which the diaphragm is in direct contact with the ear, regardless of whether it is a full-open type, an open type, a semi-open type, or a sealed type. This is because the diaphragm is supported by a damper spring as a structure for facilitating the vibration operation of the diaphragm, so that if the diaphragm is brought into direct contact with the human body, the vibration is suppressed and the air conduction sound pressure is lowered. .

Japanese Patent Publication No. 1-60999 JP 2011-135542 A

  However, in order to prevent the diaphragm from coming into contact with the ear as in the prior art, the structure of the member that supports the diaphragm becomes complicated or the number of parts increases, which increases the weight. In some cases, the size was increased.

  An object of the present invention is to provide a small and lightweight audio transmission device having a small number of parts, a simple structure, and a small size.

  The present invention proposes the following matters in order to solve the above problems. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

(1) The present invention relates to a vibration plate (111, 211, 511, 611, 711) formed in a flat plate shape and a mounting portion that is mounted on a human body in a state where the plate surface of the vibration plate is in contact with the ear of the human body. (120, 520, 620) and a voice transmission device (100, 200, 300, 400, 500, 600, 700) including a drive unit (130) that generates a drive signal for vibrating the diaphragm. ing.

  According to this invention, the diaphragm is formed in a flat plate shape. The mounting portion is mounted on the human body with the plate surface of the diaphragm in contact with the ear of the human body. The drive unit generates a drive signal for vibrating the diaphragm. Therefore, the audio transmission device has a small number of parts, a simple structure, and can be small and lightweight.

(2) The present invention is the sound transmission device according to (1), wherein the diaphragm (111) has flexibility and is deformed when attached to a human body by the attachment portion (120). Has proposed an audio transmission device (100) characterized by being in contact with a human ear.

  According to this invention, the diaphragm has flexibility, and comes into contact with the ears of the human body in a deformed state when being mounted on the human body by the mounting portion. Therefore, the sound transmission device can improve the wearing feeling of the diaphragm.

(3) In the audio transmission device according to (1) or (2), the diaphragm (111) vibrates itself by a reverse piezoelectric effect when the drive signal is given to the diaphragm. Has been proposed.

  According to this invention, the diaphragm itself vibrates due to the inverse piezoelectric effect when a drive signal is given to the diaphragm. Therefore, the audio transmission device does not need to be provided with a separate vibrator, can have a very simple structure, has an extremely small number of parts, and can be small and light.

(4) In the audio transmission device according to (3), the diaphragm (111) includes a displacement layer (111a) that generates a displacement force having an inverse piezoelectric effect, and the displacement layer from both sides. The audio transmission device (100) is characterized by having at least a pair of electrode layers sandwiched between and a protective layer (111b) for protecting the electrode layers.

  According to this invention, the diaphragm includes a displacement layer that has a reverse piezoelectric effect and generates a displacement force, at least a pair of electrode layers that sandwich the displacement layer from both sides, and a protective layer that protects the electrode layers. Therefore, the audio transmission device does not need to be provided with a separate vibrator, can have a very simple structure, has an extremely small number of parts, and can be small and light.

(5) The audio transmission device according to (3) or (4), wherein the diaphragm (111) uses a plurality of laminated piezoelectric materials. Has proposed.

  According to this invention, the diaphragm uses a plurality of laminated piezoelectric materials. Therefore, the audio transmission device can increase the amount of displacement due to the inverse piezoelectric effect, and can transmit audio with a larger volume.

(6) According to the present invention, in the audio transmission device according to (1) or (2), a vibrating portion (213, 313, 413) is attached to the diaphragm (211), and the diaphragm is The voice transmission device is characterized in that the vibrator is vibrated by the vibration transmitted when the driving signal is given to the vibrator (214) included in the vibrator and the vibrator vibrates.

  According to this invention, the vibration part is attached to the diaphragm. The diaphragm vibrates due to vibrations transmitted when a drive signal is given to the vibrator of the vibration unit and the vibrator vibrates. Therefore, the sound transmission device can be configured by selecting from more options as the material of the diaphragm.

(7) According to the present invention, in the sound transmission device according to (6), at least a part of the periphery of the vibrator (214) is covered with a protection member (216, 316A, 316B, 416A, 416B, 419). The audio transmission device (200, 300, 400) characterized by the above is proposed.

  According to this invention, at least a part of the periphery of the vibrator is covered with the protective member. Therefore, the sound transmission device can prevent damage to the vibrator and improve durability.

(8) In the audio transmission device according to (7), the protection member (316A, 316B) includes a space for housing the vibrator (214), and the vibrator is in the space. , One surface is affixed to the protective member with a double-sided tape (318), and a gap (S) is provided between the other surface and the protective member. The voice transmission device (300) is proposed.

  According to this invention, the protection member has a space for accommodating the vibrator. In the space, one surface of the vibrator is attached to the protective member with a double-sided tape, and a gap is provided between the other surface and the protective member. Therefore, the sound transmission device can protect the breakage of the vibrator without hindering the vibration of the vibrator.

(9) According to the present invention, in the sound transmission device according to any one of (1) to (8), the diaphragms (111, 211, 511, 611, 711) correspond to left and right ears. At least one pair, and the mounting portions (120, 520, 620) apply a biasing force to the diaphragm so that the diaphragm sandwiches the head of the human body at a position where it abuts the ear, Has been proposed (100, 200, 300, 400, 500, 600, 700).

  According to this invention, at least a pair of diaphragms are provided corresponding to the left and right ears. The mounting portion applies a biasing force to the diaphragm so that the diaphragm sandwiches the head of the human body at a position where the diaphragm abuts the ear. Therefore, the sound transmission device can reliably bring the diaphragm into contact with the human ear.

  According to the present invention, the audio transmission device has a small number of parts, a simple structure, and can be configured to be small and light. In addition, the sound transmission device can be heard not only by the normal hearing person but also by the hearing-impaired hearing person by transmitting the vibration to the outer ear together with the sound, and the diaphragm can be designed with no holes or holes, A device with a wide range of applications can be obtained.

It is a figure which shows the audio | voice transmission apparatus 100 of 1st Embodiment of this invention. It is a figure which shows the mounting state of the audio | voice transmission apparatus. 3 is a perspective view of a diaphragm unit 110. FIG. FIG. 4 is a cross-sectional view of the diaphragm unit 110 cut along an arrow AA in FIG. 3. 3 is a block diagram illustrating a usage state of the audio transmission device 100. FIG. It is a figure which shows the audio | voice transmission apparatus 200 of 2nd Embodiment of this invention. It is the figure which expanded and showed the vibration part. It is sectional drawing which cut | disconnected the vibration part 213 by the arrow BB in FIG. It is the figure which looked through and showed the vibration part 313 of 3rd Embodiment from the normal line direction of the plane of the vibration part 313. FIG. It is sectional drawing which cut | disconnected the vibration part 313 by the arrow CC in FIG. It is the figure which looked through and showed the vibration part 413 of 4th Embodiment from the normal line direction of the plane of the vibration part 413. FIG. FIG. 12 is a cross-sectional view of the vibrating unit 413 cut along an arrow DD in FIG. 11. It is a figure which shows the audio | voice transmission apparatus 700 which provided the through-hole in the diaphragm as a modification. It is a figure which shows the example of the audio | voice transmission apparatus which used the mounting part as the headband type. It is a figure which shows the example of the audio | voice transmission apparatus using spectacles for a mounting part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Note that the constituent elements in the present embodiment can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the present embodiment does not limit the contents of the invention described in the claims.

(First embodiment)
FIG. 1 is a diagram illustrating an audio transmission device 100 according to a first embodiment of the present invention.
FIG. 2 is a diagram illustrating a mounting state of the audio transmission device 100.
Note that each of the following drawings including FIG. 1 and FIG. 2 is a diagram schematically shown, and the size and shape of each part are appropriately exaggerated for easy understanding.

The audio transmission device 100 includes a diaphragm unit 110, a mounting unit 120, a driving unit 130, and a wiring 140.
Further, as shown in FIG. 2, the audio transmission device 100 is used by directly contacting the diaphragm 111 so as to cover the entire ear including the pinna.

The diaphragm unit 110 includes a diaphragm 111 and a frame 112, and is arranged so that two of them face each other corresponding to the left and right ears.
FIG. 3 is a perspective view of the diaphragm unit 110.
4 is a cross-sectional view of the diaphragm unit 110 taken along the arrow AA in FIG.
The diaphragm 111 is formed in a flat plate shape. When a drive signal is given to the diaphragm 111, the diaphragm 111 vibrates itself by the inverse piezoelectric effect, and converts the drive signal into acoustic vibration. Further, the diaphragm 111 has flexibility, and comes into contact with the ears of the human body in a deformed state when attached to the human body. Thereby, the diaphragm 111 fits to an ear, and a feeling of wearing can be made favorable. The diaphragm 111 has a piezoelectric film 111a and a protective layer 111b.

  The piezoelectric film 111a is formed of a flexible film-like piezoelectric body. The piezoelectric film 111a is a film-like piezoelectric body, a displacement layer (not shown) that itself has a reverse piezoelectric effect and generates a displacement force, and an electrode layer disposed so as to sandwich the displacement layer from both sides. (Not shown). In addition, a pair of conductive wires (not shown) are connected to the electrode layer and are electrically connected to the wiring 140. In order to connect this conducting wire to the electrode layer, for example, it can be fixed with a conductive adhesive.

  As the piezoelectric film 111a, for example, a transparent, flexible, and piezoelectric effect material using poly L lactic acid (PLLA) and poly D lactic acid (PDLA) can be used. Specifically, for example, Kansai University and Teijin Limited announced the development of piezoelectric materials: Kansai University, Teijin Limited, “Development of New Transparent Piezoelectric Materials”, [online], September 6, 2012 Teijin Ltd. [searched on March 6, 2013], Internet <URL: http://www.teijin.co.jp/news/2012/jbd120906.pdf> may be used.

  In addition, as the piezoelectric film 111a, for example, a material in which a piezoelectric ceramic is mixed with a viscoelastic polymer to form a piezoelectric composite and sandwiched between electrodes and then sealed with a protective layer can be used. Specifically, for example, “BEAT” announced by Fujifilm Co., Ltd .: Motonobu Kawai, “[Nanotech Exhibition] A film that can be rolled up, and Fujifilm has both flexibility and acoustic characteristics. ”Developed”, [online], January 31, 2013, Nikkei BP Co., Ltd. [searched March 6, 2013], Internet <URL: http://techon.nikkeibp.co.jp/article/EVENT/ Use 20130131/263431 />.

  Furthermore, as the piezoelectric film 111a, a polyvinylidene fluoride (PVDF) film known as a film exhibiting piezoelectricity may be used.

  The protective layer 111b is a resin layer that is provided on both sides of the piezoelectric film 111a and protects the electrodes of the piezoelectric film 111a. In addition, when using the above-mentioned “BEAT” (Fuji Film Co., Ltd.), since the protective layer has already been formed, it is not necessary to newly add the protective layer 111b.

  Further, the vibration plate 111 or the piezoelectric film 111a may be configured as a single vibration plate with a plurality of stacked piezoelectric materials. By stacking and using the diaphragm 111 or the piezoelectric film 111a, the amount of displacement due to the inverse piezoelectric effect can be increased, and the sound transmission device 100 can transmit sound with a larger volume.

The frame 112 has a function as a support member that supports the diaphragm 111. The frame 112 is formed in an annular shape, and has a flange portion 112a that slightly protrudes toward the inner peripheral side. The flange portion 112a serves as a margin for fastening the diaphragm 111 to the frame 112 with an adhesive or double-sided tape. Note that the vibration plate 111 may be attached to the frame 112 when the vibration plate 111 can be bent, and may be fixed with a double-sided tape or an adhesive so that the vibration plate 111 wraps the frame 112.
The material of the frame 112 is desirably a material that can support the diaphragm 111 so as not to loosen and that does not easily deform in shape. As a material of the frame 112, for example, metal such as spring steel, resin, elastomer, wood, and other various materials can be used.

  The mounting portion 120 is formed in a substantially arc shape by a material that is elastically deformed to generate an urging force, and connects the left and right diaphragm units 110. In the present embodiment, the mounting portion 120 has a so-called neckband type that is mounted so as to wrap around the back of the user's neck. As a material of the mounting portion 120, for example, a metal such as spring steel or a resin can be used. The mounting unit 120 holds a state in which the mounting surface 120 is mounted on the human body in a state where the plate surface of the diaphragm 111 is in contact with the ear of the human body by the urging force generated by the mounting unit 120 itself.

FIG. 5 is a block diagram illustrating a usage state of the audio transmission device 100.
The drive unit 130 includes an equalizer 131 and an amplifier 132, and generates a drive signal that vibrates the diaphragm 111 based on the audio signal sent from the playback device 150 (converts the audio signal into a drive signal). Circuit. The function of the drive unit 130 may be built in the playback device 150 or may be provided as a part of the audio transmission device 100.
Although the drive unit 130 of the present embodiment has a battery for power supply (not shown), the power may be supplied from a playback device, for example.

  The equalizer 131 performs sound quality change by performing frequency equalization. The equalizer 131 can reduce sound leakage by suppressing the output of 2 kHz to 5 kHz attached to the ear as sound leakage of the earphone, and improve the frequency of the frequency characteristics caused by the hardware. Note that the user may be allowed to switch between sound leakage reduction and frequency improvement, or both.

  The amplifier 132 is not a general audio amplifier but an audio amplifier for a piezoelectric element (capacitive load). For example, AK7846 manufactured by Asahi Kasei Electronics Corporation can be used.

  The wiring 140 is a cable that transmits a driving signal corresponding to an audio signal sent from the reproduction device 150 via the driving unit 130 to the diaphragm unit 110. One end of the wiring 140 is connected to the diaphragm unit 110. Further, the other end of the wiring 140 is connected to the playback device 150 or the like using a terminal such as a connector (not shown).

The playback device 150 includes an amplifier circuit 151 and an output unit 152. The playback device 150 may have any form as long as it is a device that outputs sound, such as a portable music player, a mobile phone device, a television receiver, or the like.
The amplifier circuit 151 is an amplifier that amplifies an audio signal such as music to be reproduced.
The output unit 152 is a terminal that outputs audio from the playback device 150. A terminal (not shown) provided on the wiring 140 of the audio transmission device 100 is connected to the output unit 152.

When the sound transmission device 100 having the above-described configuration is mounted as shown in FIG. 2, as described above, the diaphragm 111 naturally bends and directly contacts the ear. When the vibration plate 111 vibrates, the distance from the air flow is reduced by emitting air conduction sound from the vibration plate 111 located closer to the ear hole than a headphone of a type in which the vibration plate does not contact the ear, and the sound transmission device 100 , Efficient voice transmission. Further, the sound transmission device 100 transmits vibration from the vibration plate 111 to the auricle and emits air conduction sound from the skin surface of the outer ear, thereby generating air conduction sound at a position closer to the eardrum, and a small vibration output. But it can be heard enough. Furthermore, since the sound transmission device 100 directly brings the diaphragm 111 into contact with the ear, the sound transmission effect by bone conduction can be obtained and the sound can be transmitted to some sound-impaired deaf people.
Further, as described above, the audio transmission device 100 has a very simple structure and can be easily manufactured.
Furthermore, the audio transmission device 100 is easy to wear and has a good wearing feeling.
Furthermore, the audio transmission device 100 can be operated with a battery, and is excellent in portability because the device is small and lightweight.
In addition, the audio transmission device 100 can also improve the frequency characteristics by the equalizing function.

(Second Embodiment)
FIG. 6 is a diagram showing a sound transmission device 200 according to the second embodiment of the present invention.
The sound transmission device 200 of the second embodiment is the same as that of the first embodiment, except that the configuration of the diaphragm unit 210 is different from the diaphragm unit 110 of the first embodiment. Therefore, the same reference numerals are given to the portions that perform the same functions as those in the first embodiment described above, and repeated descriptions are omitted as appropriate.

  A diaphragm unit 210 according to the second embodiment includes a diaphragm 211 and a vibration unit 213.

  Unlike the diaphragm 111 of the first embodiment, the diaphragm 211 does not generate vibration itself, but vibrates when the vibration of the vibration unit 213 is transmitted. The diaphragm 211 is made of a film-like or plate-like material, and has a function of transmitting vibrations to the human auricles in addition to generating air conduction sound by vibrating by the vibration of the vibration unit 213. The diaphragm 211 is supported by the frame 112 similarly to the diaphragm 111 of the first embodiment. If the diaphragm 211 has sufficient rigidity, the frame 112 can be omitted.

The material of the diaphragm 211 is preferably a material that can easily transmit sound (high transmission speed) and that has less noise (internal loss is large).
For example, as a material for the diaphragm 211, an NCV (registered trademark) speaker diaphragm manufactured by Mitsubishi Electric Corporation can be used.
In addition, the material of the diaphragm 211 may be an aluminum metal plate that can easily transmit sound (high transmission speed), and conversely, resin (PP, PA, PEI, etc.) that generates less abnormal noise (large internal loss). ) Furthermore, a plate in which a resin and a metal are laminated may be used as the material of the diaphragm 211 so as to have both of these characteristics.
The material of the diaphragm 211 may be a speaker diaphragm and mainstream cone paper. However, since it is a fiber material, sebum and sweat may permeate and the function of the diaphragm may be reduced. It is good to coat with.
Furthermore, the material of the diaphragm 211 may be a resin material such as acrylic or PET, and may be any material as long as it bends according to the vibration of the vibrator, and may be glass or metal.

FIG. 7 is an enlarged view of the vibration unit 213.
FIG. 8 is a cross-sectional view of the vibrating portion 213 taken along arrows BB in FIG.
The vibration part 213 includes a vibrator 214, a wiring 215, a protective layer 216, and a joint part 217. The vibration unit vibrates the diaphragm 211 by the vibration of the vibrator 214 and efficiently transmits sound and vibration. Therefore, when the audio transmission device 200 is mounted, the vibration unit is disposed at the position of the diaphragm directly above the ear hole. It is desirable to do.

  The vibrator 214 is a piezoelectric ceramic bimorph element and is driven in a bending mode (flexural vibration). The piezoelectric material used for the vibrator 214 is an element in which high-displacement piezoelectric materials are stacked, and a voltage faithful to the audio signal is applied from the amplifier to the vibrator 214 by the drive signal from the drive unit 130. The transducer 214 oscillates (as a result) to reproduce the audio signal. Then, the vibration of the vibrator 214 is transmitted to the diaphragm 211.

  The wiring 215 has one end connected to the wiring 140 and the other end connected to the vibrator 214.

  The protective layer 216 is provided to protect the surface electrode of the vibrator 214 and is formed by a resin mold.

  The joining part 217 joins the vibration part 213 to the diaphragm 211. The joint portion 217 may be a resin adhesive or a double-sided tape. Further, the vibration part 213 may be attached to the vibration plate 211 using a tape or the like so as to cover the vibration part 213 without being in the form of a joint as shown in FIG.

  According to the second embodiment described above, since the diaphragm 211 is vibrated using the vibrator 214, the material of the diaphragm 211 can be selected and used from more options. Therefore, it is possible to further improve designability, to select a cheaper material, or to select a material with better wearing feeling.

(Third embodiment)
FIG. 9 is a diagram illustrating the vibration unit 313 according to the third embodiment as seen through from the normal direction of the plane of the vibration unit 313.
FIG. 10 is a cross-sectional view of the vibrating portion 313 taken along the arrow CC in FIG.
The sound transmission device 300 of the third embodiment is the same as that of the second embodiment, except that the form of the vibration unit 313 is different from the vibration unit 213 of the second embodiment. Therefore, the part which fulfill | performs the function similar to 2nd Embodiment mentioned above attaches | subjects the same code | symbol, and abbreviate | omits the overlapping description suitably.

  The vibration part 313 of the third embodiment includes a vibrator 214, a contact member 316A, a double-sided tape 318, a frame member 316B, a base material 319, and a joint part 317.

  The vibrator 214 is a piezoelectric ceramic bimorph element similar to that of the second embodiment. The entire surface of the vibrator 214 is attached to the contact member 316A using a double-sided tape 318, and the vibration of the vibrator 214 is transmitted to the contact member 316A as it is.

  The contact member 316 </ b> A is a thin plate-like member, and a peripheral portion thereof is fixed to the base material 319 using an adhesive or a double-sided tape. Further, as described above, the vibrator 214 is attached by the double-sided tape 318 near the center of the contact member 316A. Therefore, when the vibrator 214 vibrates, the contact member 316A performs the flexural vibration together with the flexural vibration of the vibrator 214.

  As the contact member 316A, a resin material such as acrylic or PET is desirable, but any material that bends in response to vibration of the vibrator may be used, and glass or metal may be used.

  The double-sided tape 318 is an adhesive member for joining the vibrator 214 and the contact member 316A.

  The frame member 316B is a member that forms the outer peripheral region and the side opposite to the contact member 316A of the vibrating portion 313. A gap S is provided between the frame member 316B and the vibrator 214. By providing the gap S, it is possible to prevent the vibration of the vibrator 214 and the contact member 316A from being hindered. Note that a flexible material that does not inhibit vibration, such as a sponge-like member, may be provided in the gap S.

  The base material 319 is a member that connects the contact member 316A and the frame member 316B, and is disposed inside the frame member 316B so as to surround the vibrator 214 along the outer peripheral wall portion. However, the base material 319 is provided so as not to contact the vibrator 214.

  The joint part 317 joins the vibration part 313 to the diaphragm 211 in the same manner as the joint part 217 of the second embodiment.

  In the third embodiment, since the vibrator 214 is covered with the frame member 316B, the vibrator 214 can be protected from external force and can be prevented from being damaged. Further, since the gap S is provided, the vibrator 214 can be protected without hindering the vibration of the vibrator 214.

(Fourth embodiment)
FIG. 11 is a diagram illustrating the vibration unit 413 according to the fourth embodiment as seen through from the normal direction of the plane of the vibration unit 413.
FIG. 12 is a cross-sectional view of the vibrating portion 413 taken along arrow DD in FIG.
The sound transmission device 400 of the fourth embodiment is the same as that of the second embodiment, except that the form of the vibration part 413 is different from the vibration part 413 of the second embodiment. Therefore, the part which fulfill | performs the function similar to 2nd Embodiment mentioned above attaches | subjects the same code | symbol, and abbreviate | omits the overlapping description suitably.

  The vibration unit 413 according to the fourth embodiment includes a vibrator 214, a contact member 416A, a double-sided tape 418, a protective frame 419, a protective layer 416B, and a joint 417.

  The vibrator 214 is a piezoelectric ceramic bimorph element similar to that of the second embodiment. The entire surface of the vibrator 214 is affixed to the contact member 416A using a double-sided tape 418, and the vibration of the vibrator 214 is transmitted to the contact member 416A as it is.

  The abutting member 416A is a thin plate-like member, and the peripheral portion is fixed to the protective frame 419 using an adhesive or a double-sided tape. Further, as described above, the vibrator 214 is attached by the double-sided tape 418 near the center of the contact member 416A. Accordingly, when the vibrator 214 vibrates, the contact member 416A performs the flexural vibration together with the flexural vibration of the vibrator 214.

  As the contact member 416A, a resin material such as acrylic or PET is desirable, but any material may be used as long as it is bent in response to vibration of the vibrator, and glass or metal may be used.

  The double-sided tape 418 is an adhesive member for joining the vibrator 214 and the contact member 416A.

  The entire protective frame 419 is formed in a substantially rectangular shape so as to surround the outer periphery of the vibrator 214. Further, the position of the protective frame 419 facing the plate surface of the vibrator 214 is a through hole in the protective frame 419 itself, and a contact member 416A and a protective layer 416B are provided so as to close the hole. .

  The protective layer 416B is provided to protect the front side of the vibrator 214 and is formed of a resin mold. Since the protective layer is formed by resin molding, it is difficult to provide the gap S shown in FIG. However, in order not to inhibit the vibration of the vibrator 214, it is desirable to provide the gap S. Therefore, in this embodiment, the protective layer 416B is formed after the sponge is stacked on the gap S so that the gap S can be formed. As a result, the sponge is interposed in the gap S, and the vibration of the vibrator 214 is not hindered.

  The joint part 417 joins the vibration part 413 to the diaphragm 211 in the same manner as the joint part 217 of the second embodiment.

  In addition, it is good also as a form which adds the protective frame 419 to the form of 2nd Embodiment, without providing the contact member 416A. In this case, the resin forming the protective layer 416B may mold the contact member 416A and the gap S.

  In the fourth embodiment, since the vibrator 214 is covered with the protective frame 419, the vibrator 214 can be protected from external force and can be prevented from being damaged. Further, by interposing a sponge in the gap S, the vibrator 214 can be protected without hindering the vibration of the vibrator 214.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes designs and the like that do not depart from the gist of the present invention.

(Deformation)
(1) In each embodiment, the frame has been described with an example of a circle. For example, the frame may be an ellipse, a rectangle, a heart shape, or other shapes.

(2) In each embodiment, the vibration plate is a simple flat plate and no hole or the like is formed. For example, a through hole may be provided in the diaphragm.
FIG. 13 is a view showing a sound transmission device 700 in which a through hole is provided in a diaphragm as a modified form.
A plurality of through holes 711 a are opened in the diaphragm 711 of the sound transmission device 700. In this way, by providing one or more open holes in the diaphragm so as not to reduce the output, it is possible to prevent the outside sound from being blocked. For example, when listening to music during sports, Can be used. Since the diaphragm of the present invention has a simple structure and is easy to process, the through hole can be easily provided as described above.
In addition, even if the through hole is not provided, the diaphragm may be designed to be thin so that the diaphragm can be vibrated by the sound of the outside world, and the shielding property of the outside sound may be reduced.
On the contrary, in the case of a sound transmission device suitable for the purpose of listening to music in a concentrated manner, the diaphragm may be designed to be thick so as to improve the sound blocking property of the outside world.

(3) In each embodiment, the example which makes a vibration part a flat shape was given and demonstrated. Not limited to this, for example, a cavity (space) is provided by projecting a wall surface from the outer periphery of the vibration part, for example, the user's head side, to cut off external sounds, and to adjust the acoustics by the cavity. You may give it.

(4) In each embodiment, the mounting portion has been described with an example of a neckband type. For example, the mounting unit may be a so-called headband type that is mounted above the user's head.
FIG. 14 is a diagram illustrating an example of a sound transmission device having a headband type mounting portion.
The mounting unit 520 of the audio transmission device 500 illustrated in FIG. 14 includes a band unit 521 and a diaphragm support unit 522.
The band part 521 is a band-shaped part formed so as to wrap around the user's head.
The diaphragm support part 522 is formed in a curved arc shape, and both ends support the diaphragm 511 and are connected to the band part 521 near the center.
The mounting part 520 having the band part 521 and the diaphragm support part 522 gives a biasing force to the diaphragm 511 so that the diaphragm 511 sandwiches the head of the human body at the position where it abuts the ear. I have to.
In addition, the diaphragm 511 is formed of a metal plate or the like having a hardness that can hold the shape without using a frame, and in this example, is formed in a substantially rectangular shape.

(5) In the modification (4), an example of a headband type as shown in FIG. 14 has been shown, but the mounting portion is configured so that the diaphragm is brought into contact with the human ear in other forms. May be.
FIG. 15 is a diagram illustrating an example of a sound transmission device that uses glasses for the mounting portion.
The mounting portion 620 of the audio transmission device 600 shown in FIG. 15 has a temple portion 621 and an auxiliary support portion 622.
The temple portion 621 uses a temple portion (vine portion) of the glasses, and a diaphragm 611 is fixed to a part thereof.
The auxiliary support portion 622 extends downward from the temple portion 621 in the mounted state, and the diaphragm 611 is fixed. In order to compensate that only the temple portion 621 can support only the upper side of the vibration plate 611, and to apply a biasing force to the vibration plate 611, the auxiliary support portion 622 may be provided. Accordingly, the diaphragm 611 can be sufficiently brought into contact with the human ear.
The diaphragm 611 is configured by a metal plate or the like having a hardness that can hold the shape without using a frame. In this example, the diaphragm 611 is formed in a substantially rectangular shape.

(6) In each embodiment, the form which enclosed and hold | maintained the diaphragm with the flame | frame was demonstrated. However, the present invention is not limited to this, and the diaphragm may be supported in any form as long as the diaphragm can properly contact the human ear. For example, the frame does not have to surround the entire periphery of the diaphragm 111. In addition, as in the case of FIGS. 14 and 15 shown in the above-described modified embodiment, a material (for example, a glass plate) that can withstand the pressure at the time of mounting and maintain the shape of the diaphragm without the diaphragm itself. Or an acrylic plate), a structure in which only a part of the diaphragm is held may be used.

(7) In each embodiment, an example in which one diaphragm is provided on each of the left and right sides has been described. However, the present invention is not limited to this. For example, a configuration in which a diaphragm is provided only in one of the two may be used. In addition, in the case where one diaphragm is provided on each of the left and right, the audio information may be stereo audio or monaural audio.

(8) In each embodiment, the audio transmission device has been described with an example in which the audio transmission device is wired to the playback device 150 in a wired manner. For example, the audio transmission device may be configured to input an audio signal to the drive unit using proximity communication such as Bluetooth (registered trademark).

(9) In each embodiment, the audio transmission device has been described with an example in which the drive unit and the vibration unit are configured separately. For example, the audio transmission device may be configured such that the drive unit and the vibration unit are integrated.

  Each embodiment and modification may be used in appropriate combination, but detailed description is omitted.

DESCRIPTION OF SYMBOLS 100 Audio transmission apparatus 110 Diaphragm unit 111 Diaphragm 111a Piezoelectric film 111b Protective layer 112 Frame 112a Flange part 120 Mounting part 130 Drive part 131 Equalizer 132 Amplifier 140 Wiring 150 Playback apparatus 151 Amplifying circuit 152 Output part 200 Audio transmission apparatus 210 Diaphragm Unit 211 Diaphragm 213 Vibrating portion 214 Vibrator 215 Wiring 216 Protective layer 217 Joining portion 300 Audio transmission device 313 Vibrating portion 316A Abutting member 316B Frame member 317 Joining portion 318 Double-sided tape 319 Base material 400 Audio transmission device 413 Vibrating portion 416A Contact member 416B Protective layer 417 Bonding portion 418 Double-sided tape 419 Protective frame 500 Audio transmission device 511 Vibration plate 520 Mounting portion 521 Band portion 522 Vibration plate support portion 600 Audio transmission device 611 Vibration plate 620 mounting portion 6 1 temple part 622 auxiliary supporting portion 700 sound transmitting apparatus 711 diaphragm 711a through hole

Claims (9)

A diaphragm formed in a flat plate shape;
A mounting part for mounting on the human body in a state where the plate surface of the diaphragm is in contact with an ear of the human body;
A drive unit for generating a drive signal for vibrating the diaphragm;
An audio transmission device comprising: The audio transmission device according to claim 1,
The diaphragm has flexibility, abuts on the ear of the human body in a deformed state when mounted on the human body by the mounting portion,
An audio transmission device characterized by the above. In the audio transmission device according to claim 1 or 2,
The diaphragm vibrates itself by an inverse piezoelectric effect when the drive signal is given to the diaphragm,
An audio transmission device characterized by the above. The voice transmission device according to claim 3.
The diaphragm is
A displacement layer having a reverse piezoelectric effect and generating a displacement force;
At least a pair of electrode layers sandwiching the displacement layer from both sides;
A protective layer for protecting the electrode layer;
Having
An audio transmission device characterized by the above. In the sound transmission device according to claim 3 or 4,
The diaphragm uses a plurality of laminated piezoelectric materials,
An audio transmission device characterized by the above. In the audio transmission device according to claim 1 or 2,
A vibrating part is attached to the diaphragm,
The vibration plate vibrates by vibration transmitted when the driving signal is given to the vibrator of the vibration unit and the vibrator vibrates;
An audio transmission device characterized by the above. The voice transmission device according to claim 6.
The vibrator is covered with a protective member at least a part of the periphery;
An audio transmission device characterized by the above. The audio transmission device according to claim 7, wherein
The protective member has a space for accommodating the vibrator,
In the space, one surface of the vibrator is attached to the protective member with a double-sided tape, and a gap is provided between the other surface and the protective member.
An audio transmission device characterized by the above. The voice transmission device according to any one of claims 1 to 8,
The diaphragm is provided in at least a pair corresponding to the left and right ears,
The mounting portion applies a biasing force to the diaphragm so that the diaphragm sandwiches the head of the human body at a position in contact with the ear;
An audio transmission device characterized by the above.

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