JPS59178895A - Earphone - Google Patents

Abstract

PURPOSE:To listen to clear sound without noise by providing a member to be coated to at least one face side in both face sides of a metallic diaphragm of a speaker so as to suppress howling. CONSTITUTION:The coated section 11 is provided to at least one face side in both face sides of the metallic diaphragm of the speaker. The coated section 11 consists of a silicon resin provided adhered closely on the surface of the metallic diaphragm 6, plastic clay, a rubber elastic device and a latex. When a voice current from a microphone, a cassette deck or the like is delivered to both electrode plates 8a, 8b of a piezoelectric speaker 7 from a connecting cord 13, an acoustic signal (voice) is reproduced from the metallic diaphragm 6 in response to the voice current and this reproduced sound is listened directly from an ear. In this case, since the coated member 11 is provided to one face side of the metallic diaphragm 6, no howling phenomenon takes place.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hearing device that can receive clear voices and prevents howling.

Generally, a small speaker is used as a sound reproduction device in a hearing device such as an earphone or a hearing aid. There are various types of small speakers. For example, when classified by conversion method, they are classified into electrodynamic, electromagnetic, and electrostatic speakers, as well as piezoelectric speakers.

Discharge type speakers are also used.

In piezoelectric speakers, the resonance of the piezoelectric material that converts electrical signals into mechanical vibrations is sharp, and it was not possible to obtain a wide band, so electrodynamic and electrostatic speakers were the mainstream for high-fidelity use, but in recent years Research on piezoelectric materials is progressing, and the range of their applications is expanding.

Conventionally, as a hearing device using such a small speaker, one shown in FIG. 1, for example, is known. 1st
The figure shows the structure of a magnetic earphone that is held (worn) using earplugs. It vibrates due to the electromagnetic attraction force generated by the audio current from etc. In other words, the audio current is
When the audio current flows, a magnetic field is generated around the vibrating membrane 1 according to the audio current, and an electromagnetic attractive force is generated. This suction force causes the vibrating membrane 1 to vibrate and reproduce an acoustic signal (sound). Then, the reproduced sound can be heard through the hole 4 formed in the earplug 3.

However, originally, sound is not only heard through air conduction through the auricles, but also through bone conduction from parts of the skull such as the mandible and cheekbones, and hearing is largely caused by bone conduction. Depends on conduction. Usually, we are not conscious of the fact that we are hearing through bone conduction, but when using this hearing device as a hearing aid,
Originally, it would have been necessary to simultaneously compensate for air conduction from the auricle and bone conduction from a part of the skull.However, most conventional hearing aids are earphone-type devices that rely only on air conduction. there were. Recently, bone conduction hearing aids have been seen here and there, but those that require surgery to fit or are attached to the rim of glasses can significantly reduce their hearing aid effectiveness if they are not firmly crimped, and may cause pain when crimped. Both had shortcomings and were unsatisfactory. A fundamental drawback of such conventional hearing aids is that air conduction hearing aids and bone conduction hearing aids are separate devices. Furthermore, such conventional hearing devices have a drawback in that a howling phenomenon occurs when the source of the reproduced sound is close to each other. For example, when a hearing-impaired person uses a hearing aid, howling is particularly likely to occur because the reproduction speaker and the microphone that converts external sound into electrical signals are very close together. Because it increases the output of high-speed speakers, it has the disadvantage of causing a significant amount of discomfort.Also, since the user uses the ear directly to listen to the reproduced sound through air conduction, it cannot be used for long periods of time. There was a problem that the pressure caused discomfort.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology.
By providing a covering member on at least one side of the inside to create a howling prevention structure, howling is suppressed.
You can listen to clear voices without noise, and you can also listen by air conduction using direct 1 and ears, i□i, and by bone conduction without using direct ears.・The aim is to provide a hearing device that can be used for long periods of time and relieves the feeling of pressure when used for long periods of time. This makes it possible to provide new hearing aids with lower costs.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 22 shows a hearing device using a piezoelectric speaker according to the present invention. In the figure, 5 is a piezoelectric body molded from a piezoelectric material such as barium titanate porcelain, and 6 is a piezoelectric speaker constructed from this piezoelectric body 5. The metal diaphragm No. 7 is formed into a substantially flat plate shape so that it can come into contact with the skin.

8a and 8b are electrode plates of the piezoelectric speaker 7, which are provided by vapor-depositing nickel, silver, etc. on both sides of the piezoelectric body 5; 9 is a sound absorbing material such as rock wool provided on the back of the electrode plate 8b, and the reproduced sound is transmitted to the outside. Please do not communicate this to others. 10 is a housing of the piezoelectric speaker 7, and 11 is a silicone resin provided in close contact with the surface of the metal diaphragm 6.

A covering member 12 made of plastic clay, rubber-like elastic material, latex, etc., is a frame connected to the outer periphery of the housing 1o, and has a concave shape so that the metal diaphragm 6 can come into contact with the skin, and has a sound absorption effect. It is made of large material. A connection hood 13 is connected to both electrode plates Ba and Bb of the piezoelectric speaker 7 by soldering.

Since the piezoelectric speaker 7 has a high impedance of the piezoelectric body 5, which is a solid-state electromechanical transducer, an input transformer (not shown) is required to make the piezoelectric speaker 7 compatible with an AT-type speaker or the like. Furthermore, as the piezoelectric body 5, other piezoelectric materials such as one made of a polymeric polyvinylidene fluoride (PVF) formed into a thin film may be used.

The action will be explained based on the above structure.

Microphone, cassette deck 4. The audio current from fl is transmitted from the connection cord 13 to both electrode plates 8a of the piezoelectric speaker 7.
, 3b, the metal diaphragm 6 responds to the sound current.
An acoustic signal (voice) is reproduced from the device, and this reproduced sound can be heard directly through the ears.

At this time, since the covering member 11 is provided on one side of the metal diaphragm 6 to prevent howling, it is possible to listen to clear reproduced sound without noise without causing the howling phenomenon. In particular, when this hearing device is used as a hearing aid, there is almost no howling, so there is no discomfort, and natural sounds from the large metal diaphragm 6 of the piezoelectric speaker 7 can be heard. Furthermore, this hearing device can also detect reproduced sound through bone conduction through the skin and C without directly using the ear.

In that case, the piezoelectric speaker 7 is held by pressing the metal diaphragm 6 against the skin, for example, the mandible, through the covering member 11 and bringing the frame 12 into close contact with the surrounding skin. A sound absorber 9 is provided on the back of the electrode plate 8b of the piezoelectric speaker 7, and the frame 12 is attached to the back of the electrode plate 8b. Therefore, the reproduced sound is not transmitted to the outside, and the reproduced sound (sound) transmitted from the metal diaphragm 6 can be sensed by the bone conduction effect.

In other words, the sound played from the piezoelectric speaker 7 can be sensed from the skin through the skull without directly applying vibration sound (playback sound) from the ear canal. It is fine as long as it is in the forehead area, but the mandibular area is more preferable. In this way, the reproduced sound from the piezoelectric image speaker 7 can be heard through the ear canal through air conduction, or can be heard through bone conduction by bringing the safe diaphragm 6 into contact with the skin of the mandible, etc. You can avoid feeling pressure by using your ears. Note that if the reproduced sound is only to be heard directly through the ear through air conduction, the frame 12 is unnecessary, and in that case, although not shown, a holding means such as an ear hook may be used. housing 10
Although the sound absorbing body 9 is provided as a closed structure,
There is no need to provide this for private banks that have an oven-air type structure. Furthermore, although the covering member 11 is provided in close contact with the front side of the university diaphragm 6, it may also be provided in close contact with the back side, that is, the back surface of the electrode plate 8b, or it may be provided in close contact with both sides. It's okay.

Further, as shown in FIG. 3, two of these hearing devices may be used to form a headphone style configuration.

That is, the left and right hearing devices are connected via a headband 14, and the headband 14 is used by hanging on the head. A headband 14 is used as a holding means for the piezoelectric speaker 7, and air pads is provided at the portions that contact the left and right ears. By using this headphone style, it is also possible to listen to stereo reproduction sound.

FIG. 4 is a sectional view showing the structure of another embodiment.

This embodiment has an ear canal insertion type structure using an ear plug inserted into the ear canal as a holding means for holding the speaker. In the figure, 16 is a bimorph element molded from a piezoelectric material such as Rochelle salt; is a metal diaphragm, 18 is gold P
A covering member 19 provided in close contact with one surface of the diaphragm 17
is an earplug as a retention means.

The reproduced sound emitted from the metal diaphragm 17 is applied to the ear through the hole 20 formed in the earplug 19, and since the covering member 18 is provided in close contact with the metal diaphragm 17 as in the previous embodiment, Howling phenomenon does not occur, and clear audio without noise can be heard. Although the hearing device of this embodiment is slightly inferior in temperature and humidity characteristics, it has good sensitivity and can be made of a small and light bone, making it ideal for portable radios and hearing aids.

In each of the above embodiments, a piezoelectric speaker made of a piezoelectric material is used as a speaker for reproducing an acoustic signal. This is because piezoelectric speakers have a simple structure and are inexpensive.

Conventional electrodynamic and electromagnetic speakers using vibrating membranes have no choice but to use the inefficient method of bone conduction from the skin via air conduction.

Moreover, the hearing device according to the present invention can be used not only for portable use, but also for portable use.
It can also be used indoors. That is, as shown in FIG. 5, when using the room as a supplementary L/U tE, an audio player 23 equipped with a microphone 21 and a volume adjuster 22 is installed at an appropriate position in the room. By inserting the connection cord 13 shown in FIGS. 2 and 3 into the terminal 24, audio from the microphone 21 can be heard. When using audio equipment such as a cassette or deck, just plug the connection cord 13 into its output terminal, but when using a piezoelectric speaker, the output will drop due to the difference in internal impedance, but the volume can be turned up to maximum. There will be no problem in normal use.

In addition, it is possible to simultaneously receive the reproduced sound through both air conduction and bone conduction. For example, it is possible to receive sound from both the left and right ears through air conduction and also through bone conduction. Both can be used as hearing aids. When used, further hearing aid effects can be achieved.

As mentioned in the above explanation, even if an electrodynamic dynamic speaker or an electromagnetic speaker is used, the coating member can be placed in close contact with the metal diaphragm. It has a structure that prevents nodding and allows you to hear clear voices.

Indeed, as shown in FIG. 6, it is also possible to obtain a hearing device having a structure in which a metal diaphragm 28 is provided between two piezoelectric bodies 27 and 27 made of barium titanate, each coated with a nickel film 26 on both sides. can. The tube surrounding the speaker having this configuration is filled with an elastic body 29 such as silicone rubber, and audio current is input from both electrode terminals 〇 and D. When this hearing device is used as a hearing aid, the hearing aid effect is good. Furthermore, as the metal diaphragm, aluminum, beryllium, titanium, boron, etc. are widely used.

As explained above, according to the present invention, the present invention includes a speaker that reproduces an acoustic signal and a holding means that holds the speaker, and a covering member is provided on at least one surface of both surfaces of a metal diaphragm of the speaker. Because it has a structure that prevents howling, there is almost no howling phenomenon, and you can hear clear sounds without noise. Especially when people with excellent hearing use it as a hearing aid, they are completely free from the discomfort caused by howling. It is possible to use a piezoelectric speaker which has the effect of reducing the noise and has a simple structure and is inexpensive. In addition, it is possible to detect the reproduced sound through the bone conduction effect through the skin without using the ears directly, which has the effect of freeing the user from the discomfort caused by using the ears open for long periods of time, such as feeling pressured. .

Furthermore, when used as a hearing aid, since it is possible to receive sound through both air conduction and bone conduction, the hearing aid effect is greatly increased.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the structure of a conventional example, Fig. 2 is a cross-sectional view showing the structure of an embodiment of the present invention, Fig. 3 is an explanatory drawing explaining an example of use of the hearing device shown in Fig. 2, Figure 4 is a sectional view showing the structure of another embodiment, Figure 5 is an explanatory diagram illustrating an example of indoor use, and Figure 6 is a horizontal placement of a hearing device using two piezoelectric bodies. It is a diagram. 6.17...Metal diaphragm 3.19...Ear plugs 7...Piezoelectric speaker 11.18
...Covering members Note that the same reference numerals in the drawings indicate the same or corresponding partsC. Procedural amendment (voluntary) Patent application 2 filed on April 13, 1980 and March 30, 1988. Sound instrument 3, connection with the famous case to be amended 1 Applicant's address (residence) Name Keimo Tsutsumi Representative 6 Number of inventions increased due to sleeve correction (no change in content) Procedure - Amendment document 1982 May 20, 2015 3 Relationship with the case of the person making the amendment Applicant's address (residence) Name (residency) Name (residence) Name (residence) Tsutsumi Buttocks Representative 6 Number of inventions increased due to sleeve correction Amended specification 1, name of invention Hearing instrument 2 , Claims (1) A speaker for reproducing an acoustic signal and a holding means for holding the speaker, wherein a covering portion is provided on at least one of both surfaces of a metal diaphragm of the speaker. A hearing device featuring: (2) The hearing device Q according to claim 1, characterized in that the speaker is a piezoelectric type speaker made of a piezoelectric material. (3) The speaker is characterized in that it is an electrodynamic type dynamic speaker. A hearing device according to claim 1. (4) The hearing device according to claim 1, wherein the speaker is an electromagnetic speaker. (5) The hearing device according to any one of claims 1 to 4, wherein the metal diaphragm of the speaker is formed into a substantially flat plate shape so that it can come into contact with the skin. (6) The hearing instrument according to any one of claims 1 to 4, wherein the holding means for holding the speaker is of an ear canal insertion type using an ear plug that is inserted into the ear canal. 3. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel contact-type hearing device that allows the user to listen to clear voices with good quality, is comfortable to use, and can prevent knowling. Generally, a small speaker is used as a sound reproduction device in a hearing device such as an earphone or a hearing aid. There are various types of small speakers. For example, when classified by conversion method, they are classified into electrodynamic, electromagnetic, and electrostatic speakers, as well as piezoelectric speakers. Discharge type speakers are also used. In piezoelectric speakers, the resonance of the piezoelectric material that converts electrical signals into mechanical vibrations is sharp, and it was not possible to obtain a wide band, so electrodynamic and electrostatic speakers were the mainstream for high-fidelity use, but in recent years Research on piezoelectric materials is progressing, and the range of their applications is expanding. Conventionally, as a hearing device using such a small speaker, one shown in FIG. 1, for example, is known. sg
Figure 1 shows the structure of a magnetic earphone that is held (worn) using earplugs.
vibrates due to the electromagnetic attraction force generated by the audio current from a microphone or the like. That is, when an audio current flows through the audio coil 2, an arsenic field is generated around the vibrating membrane 1 in response to the audio current, and an electromagnetic attractive force is generated. This suction force causes the vibrating membrane 1 to vibrate and reproduce an acoustic signal (sound). Then, the reproduced sound can be heard through the hole 4 formed in the earplug 3. However, originally, sound is not only heard through air conduction through the auricles, but also through bone conduction from parts of the skull such as the mandible and cheekbones, and hearing is largely caused by bone conduction. Depends on conduction. Normally, we are not aware of what we are hearing through bone conduction, but when using this hearing device as a hearing aid,
Originally, it would have been necessary to simultaneously compensate for both air conduction from the auricle and bone conduction from a part of the skull. However, most conventional hearing aids have been earphone-type hearing aids that rely only on air conduction. Recently, bone conduction hearing aids have been seen here and there, but they often require surgery to fit.
Those attached to the rims of glasses have drawbacks such as the hearing aid effectiveness is significantly reduced unless they are firmly crimped, and the crimping causes pain. A fundamental drawback of such conventional hearing aids is that air conduction hearing aids and bone conduction hearing aids have been provided with separate hearing aids. Also,
Such conventional hearing aids have a drawback in that a howling phenomenon occurs when the source of the reproduced sound is close to each other. For example, when a hearing person uses a hearing aid, howling is particularly likely to occur because the reproduction speaker and the microphone that converts external sound into electrical signals are very close together. Since the output of a high-speed speaker is increased, it has the drawback of causing a significant amount of discomfort. In addition, since the user uses the ear directly to listen to the reproduced sound through air conduction, there is a problem in that if the device is used for a long period of time, it may cause discomfort due to pressure. In addition, among bone conduction hearing aids that come in contact with the human body, in addition to the above-mentioned howling phenomenon, there is a risk of inconveniences such as a cold and uncomfortable feeling on the skin and corrosion due to sweating or electric shock. . This invention was made to eliminate the above-mentioned drawbacks of the conventional technology.
By providing a covering member on at least one side,
Howling can be suppressed and clear audio can be heard without noise. Also, it is possible to use the ear directly, listening by air conduction, and directly using the ear, and it can be used by contacting a part of the human body. The aim is to provide a hearing device that allows both bone conduction listening methods and eliminates the feeling of pressure when used for long periods of time. It is possible to provide a new hearing aid that has an additive hearing aid effect. In addition, in an implantable hearing aid that is implanted into the human body for use, a technology was developed in Japanese Patent Application Laid-Open No. 5 (1973) in which the surface of the piezoelectric element as a sounding body is coated with a material such as silicone rubber.
This coating treatment, which is disclosed in Japanese Patent No. 5-44239, is carried out to prevent rejection reactions with living cells that occur when the piezoelectric element itself is implanted, and is used to prevent nodding. , it should not be expected to have any effect such as preventing sweating. An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a hearing device using a piezoelectric speaker according to the present invention. In the figure, 5 is a piezoelectric body molded from a piezoelectric material such as barium titanate porcelain, and 6 is a piezoelectric body made of this piezoelectric body 5. The metal diaphragm of the speaker 7 is formed into a substantially flat plate shape so that it can come into contact with the skin. 8a't 3b is the electrode plate of the piezoelectric speaker 7, which is provided by vapor-depositing Nikkenope silver or the like on both sides of the piezoelectric body 5, and 9 is a sound absorbing material such as rock wool provided on the back of the electrode plate 8b, so that the reproduced sound is Please do not transmit it to the outside. 10 is a housing of the piezoelectric speaker 7; 11 is a silicone resin provided in close contact with the surface of the metal diaphragm 6; A covering member made of plastic clay, rubber-like elastic material, latex, etc., 12 is a frame connected to the outer periphery of the M housing 10, and has a concave shape so that the metal diaphragm 6 can come into contact with the skin, and has a sound absorption effect. It is made of a large material. Reference numeral 13 denotes a connection cord connected to both electrode plates 8a and 8b of the piezoelectric speaker 7 by soldering. In the piezoelectric speaker 7, since the impedance of the piezoelectric body 5, which is a solid-state electromechanical transducer, is high, an input transformer (not shown) is required to make the piezoelectric speaker 7 compatible with an electrodynamic speaker or the like. Further, as the piezoelectric body 5, other piezoelectric materials such as a material formed by molding a polymeric polyvinylidene fluoride (PVF2) into a thin film may be used. The operation will be explained based on the above configuration. Audio current from a microphone, cassette deck, etc. is transmitted from the connection cord 13 to both electrode plates 8a and 8b of the piezoelectric speaker 7.
When the sound signal is transmitted to the sound current, an acoustic signal (voice) is reproduced from the metal diaphragm 6 in accordance with the sound current, and this reproduced sound can be heard directly through the ear. At this time, since the covering member 11 is provided on one side of the metal diaphragm 6, the howling phenomenon does not occur, and clear reproduced sound without noise can be heard. and,
When this hearing device is used as a hearing aid, especially a bone conduction type human body contact structure, there is almost no feedback, so there is no discomfort, and at the same time, inconveniences such as metal corrosion or electric shock due to sweating can be avoided. Noise is absorbed, the sound quality can be improved, and natural sound can be heard through the metal pickup plate 6 with a large piezoelectric speaker γ. In addition, when used as a bone conduction method, the metal diaphragm 6
is pressed against the skin, for example, the mandible, through the covering member 11, and the frame 12 is brought into close contact with the surrounding skin to hold the piezoelectric speaker 7. A sound absorber 9 is provided on the back of the electrode plate 8b of the piezoelectric speaker 7, and the frame 12 is brought into close contact with the skin, so that the reproduced sound is not transmitted to the outside.
The reproduced sound (vibration sound) transmitted from the metal diaphragm 6 can be sensed by the bone conduction effect. In other words, the sound played from the piezoelectric speaker 7 can be sensed from the skin through the skull without applying percussion sound (playback sound) directly from the external auditory canal. The range from the forehead to the forehead is fine, but the mandibular region is more preferable. In this way, the reproduced sound from the piezoelectric speaker 7 can be heard through the ear canal through air conduction, or can be heard through bone conduction by bringing the metal diaphragm 6 into contact with the skin of the mandible, etc. You can avoid feeling pressure by using your ears. Note that if the reproduced sound is only to be heard directly through the ear through air conduction, the frame 12 is unnecessary, and in that case, although not shown, a holding means such as an ear hook may be used. Although the housing 10 and the sound absorber 9 are provided as a closed type structure, they are not necessary in the case of an oven air type structure. Further, the covering portion 11 is provided in close contact with the front side of the metal diaphragm 6, but it may also be provided in close contact with the back side, that is, the back surface of the electrode plate 8b, or it may be provided in close contact with both sides. Good too. Further, as shown in FIG. 3, two of these hearing devices may be used to form a headphone style configuration. That is, the left and right hearing devices are connected via a headband 14, and the headband 14 is used by hanging on the head. A headband 14 is used as a holding means for the piezoelectric speaker 7, and air pads 15, 15- are provided at the portions that contact the left and right ears. By using this headphone style, it is also possible to listen to stereo reproduction sound. FIG. 4 is a sectional view showing the structure of another embodiment. This embodiment has an ear canal insertion type structure using an ear plug inserted into the ear canal as a holding means for holding the speaker. In the figure, 16 is a bimorph element molded from a piezoelectric material such as Rochelle salt; 18 is a metal diaphragm, 18 is a covering member provided in close contact with one surface of the metal diaphragm 1T, 19
is an earplug as a holding means.0 The reproduced sound emitted from the metal diaphragm 17 is applied to the ear through the hole 20 formed in the earplug 19. 18 in close contact with each other, no howling phenomenon occurs, and clear audio without noise can be heard. Although the hearing device of this embodiment has slightly inferior temperature and humidity characteristics, it has good sensitivity and can be made of a small and light bone, making it ideal for portable radios and hearing aids. In each of the above embodiments, a piezoelectric speaker made of a piezoelectric material is used as a speaker for reproducing an acoustic signal. However, since the diaphragm is made of metal, the diaphragm is made of metal, so it is difficult to touch the metal plate directly against the skin. This is because it is possible to hear vibrations through bone conduction, and piezoelectric speakers have a simple structure and are inexpensive. Conventional electrodynamic and electromagnetic speakers that use a vibrating membrane have no choice but to use the inefficient method of bone conduction from the skin via air conduction. Moreover, the hearing device according to the present invention can be used not only for portable use, but also for portable use.
It can also be used indoors. That is, as shown in FIG. 5, when used as an indoor hearing aid, an audio playback device 23 equipped with a microphone 21 and a volume adjuster 22 is installed in an appropriate position indoors, and By inserting the connection cord 13 shown in FIG. 3 into the terminal 24, it is possible to listen to audio from the microphone 21. When using audio equipment such as a cassette or deck, just plug the connection cord 13 into its output terminal, but when using a piezoelectric speaker, the output will drop due to the difference in internal impedance, but the volume can be turned up to maximum. There will be no problem in normal use. Yes, it is possible to hear the reproduced sound simultaneously through both air conduction and bone conduction. For example, it is possible to listen to the reproduced sound from both the left and right ears through air conduction and at the same time through bone conduction. In particular, hearing aids When used as a hearing aid, even greater hearing aid effects can be achieved. As mentioned above, even if an electrodynamic dynamic speaker or an electromagnetic speaker (magnetic speaker) is used, and a covering member is placed in close contact with the metal diaphragm, it will not be possible to prevent howling or otherwise. The structure improves this type of inconvenience, and allows clear audio to be heard. Furthermore, as shown in FIG. 6, it is also possible to obtain a hearing device of configuration 1, in which a metal diaphragm 28 is provided between two piezoelectric bodies 27 and 27 made of barium titanate, each coated with a nickel film 26 on both sides. can. The periphery of the speaker having this configuration is filled with an elastic body 29 such as silicone rubber, and audio current is input from both electrode terminals C and D. When this hearing device is used as a hearing aid, the hearing aid effect is good. Furthermore, as the metal diaphragm, aluminum, beryllium, titanium, boron, etc. are widely used. As explained above, according to the present invention, the present invention includes a speaker for reproducing an acoustic signal and a holding means for holding the speaker, and at least one surface of the metal diaphragm of the speaker is coated. Because the material is coated with gold, there is almost no howling phenomenon, allowing you to hear clear sounds without noise, and especially when used as a hearing aid by a hearing-impaired person, it is completely free from the discomfort caused by howling. ,
Moreover, a piezoelectric speaker with a simple structure and low cost can be used. In addition, it is possible to detect the reproduced sound through the bone conduction effect through the skin without using the ears directly, and since the contact is soft, it does not impair the tactile sensation and prevents pressure sensations caused by using the ears open for a long time. It relieves discomfort, absorbs noise, improves sound quality, and prevents inconveniences such as corrosion caused by sweating or electric shock. Furthermore, when used as a hearing aid, since it is possible to receive sound through both air conduction and bone conduction, the hearing aid effect is greatly increased. 4. Brief description of the drawings Figure 1 is a sectional view showing the structure of a conventional example, Figure 2 is a sectional view showing the structure of an embodiment of the present invention, and Figure 3 is a diagram showing the use of the hearing instrument shown in Figure 2. An explanatory drawing for explaining an example. Fig. 4 is a sectional view showing the structure of another embodiment. Fig. 5 is an explanatory drawing for explaining an example of indoor use. Fig. 6 is a hearing device using two piezoelectric bodies. FIG. 6.17...Metal diaphragm 3.19...Ear plugs 7...Piezoelectric speaker 11.18・Covering members The same symbols in the drawings are the same, and O indicates the part corresponding to the cut G. Procedural Amendments January 201, 1980" Kazuo Wakasugi, Commissioner of the Japan Patent Office 1, Indication of the case 1988 Patent 19 negative 525th
44 JY*2 Name of the invention Listener 3 Relationship with the case of the person making the amendment Applicant's address (residence) Name Imoimoki≠ Tsutsumi Representative 5 Daily publication of the amendment order Showa E day (
Voluntary) 6. Number of inventions increased by amendment 7. Subject of amendment Description, letter number (detailed description of invention column) 8. Contents of amendment Attachment 9 8. Contents of amendment (1) No. 1 of the description On page 13, line 16, after the word ``Aru.'', it says, ``According to this invention, only air conduction from the ear, bone conduction from the cortical layer, or a combination of both can be used. WL because you can use it in any condition you like.
Hearing aid n! Healthy people listen to sounds through bone conduction through the skin, which can be seen as an organ for language learning. When studying vocal music, sutras, etc., you can listen to the sound through your ears using air conduction and listen to it in two places on each side and four places on the left and right sides.

Claims (6)

[Claims] (1) A speaker that reproduces an acoustic signal and a holding means for holding the speaker are provided, and a covering member is provided on at least one surface of both surfaces of a metal diaphragm of the speaker to provide a howling prevention structure. A hearing device featuring: (2) The hearing instrument according to claim 1, wherein the speaker is a piezoelectric speaker made of a piezoelectric material. (3) The hearing instrument according to claim 1, wherein the speaker is an electrodynamic dynamic speaker. (4) The hearing device according to claim 1, wherein the speaker is an electromagnetic speaker. (5) The hearing device according to any one of claims 1 to 4, wherein the metal diaphragm of the speaker is formed into a substantially flat plate shape so that it can come into contact with the skin. (6) The hearing instrument according to any one of claims 1 to 4, wherein the holding means for holding the speaker is of an ear canal insertion type using an ear plug that is inserted into the ear canal.