KR20080070468A - Skin conductive speaker - Google Patents

Abstract

A skin conductive speaker is provided to prevent a noise from being generated by a sound vibration when a user listens to high power music. A skin conductive speaker includes a rivet tube(110), a cover(22), a vibration transfer member, a cushion member(94), and an elastic unit(130). The rivet tube has a penetrated center, and couples and fixes a magnet, a yoke and a center of the vibration plate. The cover is coupled to an outer side of the vibration plate of a housing, and has an axial hole on a center. An end of the vibration transfer member is contacted with an outer plane of the rivet tube. A connection unit from a center unit of a contact unit is protruded and is movably inserted into the inside of the rivet tube. The other end of the vibration transfer member is withdrawn to an outer side of the cover through the axis hole of the cover. An outer stepped unit of the vibration transfer member is extended to a side part and forms a vibration expansion plate. The cushion member covers an outer plane of the vibration expansion plate of the vibration transfer member. The elastic unit separates the contact unit of the vibration transfer member from the rivet tube.

Description

Skin conduction speaker {SKIN CONDUCTIVE SPEAKER}

1 is a cross-sectional view showing the configuration of a conventional common bone conduction speaker.

Figure 2 is a cross-sectional view showing the basic configuration of the skin conduction speaker according to the present invention.

Figure 3 is an exploded cross-sectional view of the skin conduction speaker according to the present invention.

Figure 4 is a plan view showing the configuration of the coil plate of the skin conduction speaker according to the present invention.

5 is a cross-sectional view showing another embodiment of a skin conduction speaker according to the present invention.

6 and 7 are cross-sectional views showing the operation of the skin conduction speaker according to the present invention.

<Description of Symbols for Main Parts of Drawings>

20: housing 21: locking jaw

22: cover 30: coil plate

40: voice coil 50: magnet

60: yoke 70: diaphragm

80: circuit board 90: vibration transmission member

93: vibration diffusion plate 110: rivet tube

130: elastic means

The present invention relates to a skin conduction speaker, and more particularly, to transmit acoustic vibrations, which are bone conduction through human skin contact, to the skin with a wide contact area, thereby maximizing vibration spreading efficiency without causing stimulation. The clear sound quality of the wide range can be listened to for a long time, and when it is not worn, the sound caused by the vibration is minimized to the outside, thereby maintaining communication security and at the same time the sound vibration when listening to high-power music. It relates to a skin conduction speaker configured to prevent the generation of noise caused by.

In general, there are two ways that a person can hear sound: air conduction and bone conduction.

Air conduction is a method in which sound is transmitted through the eardrum to the inner ear. In general, the vibration of the sound transmitted to the air is transmitted to the eardrum and the vibration is “Wow” through the three bones located in the eardrum. Is delivered.

Therefore, the cochlear snail is filled with a liquid called rinba liquid, and the vibration of the liquid is converted into an electrical signal and transmitted to the auditory nerve so that the human brain recognizes sound.

On the other hand, the bone conduction method is that the sound through the skull (Cranial Bone) is transmitted to the cochlea, and through the auditory nerve to the brain, the process of vibration through the three bones located in the eardrum and eardrum in the sound recognition mechanism is omitted. It is.

In other words, acoustic vibrations applied to the surface of the skin around the ear are transmitted directly to the cochlea through the skull, so that even if the eardrum or the ear bones are abnormal, if the cochlear or auditory nerve is normal, bone conduction through the skin is ensured. You will hear the sound.

As an example of the conventional skin conduction speaker based on the bone conduction principle, as shown in FIG. 1, a current is applied from the external power supply source to the electrode terminal plate 1 so that the voice coil 2 is formed along the coil from the electrode terminal plate 1. When a current is supplied to the voice coil 2, the voice coil 2 induces a change in the magnetic field from the voice signal electrical energy. That is, when a current is applied to the voice coil 2, a magnetic field is generated between the voice coil 2 located in the gap G of the magnetic circuit composed of the top plate 3, the magnet 4 and the yoke 5. As it happens, Fleming's left-hand rule holds.

Then, when the voice coil 2 is fixed, magnetic fields formed between the voice coil 2, the upper plate 3, the magnet 4, and the yoke 5 mutually engage with each other by applying attraction and repulsive force. The upper plate 3, the magnet 4, and the yoke 5, which are circuits, vibrate up and down.

At this time, free damping of the magnetic circuit is suppressed by the damper 6 provided at the upper end of the yoke 5 to maintain constant vertical vibration. This vibration is transmitted to the skin surface of the head of the person in contact with the mastoid 8 through the mastoid 8, which is the uppermost part of the fixed rivet 7, so that the vibration force for listening to the bone acoustic vibration is Obtained.

That is, the fixed rivet 7 which fixes the voice coil 2 to the base plate 9 and constitutes a magnetic circuit capable of vertical vibration by the yoke 5, the magnet 4 and the upper plate 3, and fixes them together. By providing a mastoid 8 for transmitting acoustic vibrations to the top of the outside, the head bone forming the human skull is directly vibrated through the surface of the skin to stimulate the auditory nerve through bone conduction, and of course, the normal person. Various hearing impaired people will hear the sound.

Most conventional skin conduction speakers based on the bone conduction principle have been developed for the hearing-impaired and the hearing impaired, and have been mainly applied to listening to low-power acoustic vibrations as a configuration for voice listening.

However, in recent years, as the hearing impaired people also use the skin conduction speaker to expand the use of the skin conduction speaker to listen to music through a mobile device or an MP3 device, the skin conduction speaker that exhibits high-power acoustic vibrations that can listen to music in addition to audio listening. The product was required.

In addition, in the conventional skin conduction speaker, since the mastoid has a small size in the form of a projection for low-power acoustic vibration, the acute pain in the skin contact area as the acoustic vibration output from the mastoid acts locally on the skin. It caused a problem that can not hear the sound for a long time.

As a prior art for solving such a problem, Patent Registration No. 10-390003 "Goldo speaker using a fan plate and a mobile phone having the same" and Patent Publication No. 10-2006-58078 "Function speaker for portable terminals" disclosed There is a bar.

In the prior art as described above, "a bone conduction speaker using a floor plate and a mobile telephone having the same" is a bone conduction speaker having a vibration listening function and a sound listening function, and is configured to selectively perform acoustic listening and vibration listening. .

And, "functional speaker for portable terminal" uses a plurality of magnets and separate vibration and voice coil to configure a magnetic circuit to obtain a high vibration force output for listening to music, the magnet for the speaker directly on the vibration magnetic circuit An additional circuit consisted of a bundle of magnetic circuits.

The bone conduction speakers of the prior art are mostly integrated with a magnet, a diaphragm, and a mastoid for generating acoustic vibration, and in particular, the mastoid has a plate shape.

Therefore, when the vibration plate vibrates by the magnetic circuit, the vibration is transmitted to the entire surface of the plate-shaped mastoid to output the acoustic vibration, so that the acoustic vibration is not locally acted on the skin and the acoustic vibration is transmitted by the surface contact. As possible, the sound was heard without causing pain in the skin contact area.

However, in the bone conduction speaker of the prior art, since the acoustic vibration generated in the diaphragm is transmitted from the diaphragm to the plate-shaped mastoid as it is, the sound quality due to the acoustic vibration is dropped, causing noise, etc., and it is possible to properly implement a wide range of sound bands. It is a situation that there is a problem that it is difficult to apply to a high-power skin conduction speaker product for listening to music because it is impossible to listen to sound of good quality because there is no limit.

Another problem is that skin conduction speakers are generally applied to earphones or headphone products, and the surface of the mastoid is worn with a predetermined adhesion force so as to transmit vibration to the skin well.

Therefore, when worn and used, the sound vibration is transmitted to the skin, so that the sound due to the sound vibration to the outside can be listened to almost without leaking.

However, when not wearing, the user's mastoid of the skin conduction speaker is not in contact with the skin, so the acoustic vibration output through the plate-shaped mastoid is diffused into the air so that the acoustic vibration can be heard at a normal standard. When applied to earphones, it was difficult to maintain communication security.

In addition, when listening to high-power music at a high volume, the sound is spread through the plate-shaped mastoid, and the sound diffused into the air by acoustic vibration cannot be heard by the hearing impaired, but the normal person. As a result of the noise phenomenon, such as the sound of strange lumps rather than the sound of small music output from a general acoustic speaker, a problem arises that causes discomfort to users and neighbors.

On the other hand, most of the conventional bone conduction speaker is a heat generation phenomenon by the voice coil in operation therein.

At this time, the generated heat affects the magnet, which causes the deterioration of product performance due to the deterioration of the magnetic force caused by long-term use.

However, the conventional bone conduction speaker has a path for heat dissipation toward the diaphragm, but on the other side, the heat dissipation path for inflow or discharge of outside air is not secured, so the heat dissipation effect is very low. There was also a problem that the acoustic vibration efficiency is reduced.

In addition, the plate on which the voice coil is mounted is mounted on a cover or a separate plate assembled by a simple fitting method on the upper and lower parts of the housing, and assembling defects of the cover or plate on which the voice coil is mounted often occur according to the assembly state with the housing. There was also a problem in that the distribution of the magnetic field between the voice coil and the magnetic circuit was not maintained uniformly, leading to product defects.

The present invention was devised to solve the above-mentioned problems, and a vibration transmission member having an acoustic vibration transmission path to concentrate and receive acoustic vibrations of the diaphragm from the center of the diaphragm to spread the vibrations to a wide area in contact with the skin. The sound vibration transmitted through bone contact through human skin is transmitted to the skin with a wide contact area, maximizing vibration diffusion efficiency, so that you can listen to clear sound quality in a wide range without long stimulation for a long time. It is to provide a skin conduction speaker made.

Another object of the present invention is to configure the vibration transmitting member to be in a state in which the vibration transmitting member is in close contact with the diaphragm when the skin conduction speaker is not worn, thereby preventing the acoustic vibration from being transmitted to the vibration transmitting member. It is to provide a skin conduction speaker that does not leak the sound due to the acoustic vibration to the outside as it is conventionally, to maintain communication security, and to prevent the unpleasant noise spread by the acoustic vibration of the high output sound.

Still another object of the present invention is to provide a skin conduction speaker having a coil plate equipped with a voice coil having a heat dissipation structure for solving a defect caused by heat generation by a voice coil in a bone conduction speaker.

Still another object of the present invention is to provide a skin conduction speaker that can prevent assembly failure between a coil plate to which a voice coil is mounted and a housing.

In order to achieve the above object, the skin conduction speaker according to the present invention has a voice coil installed inside the housing by a coil plate, and magnets are disposed in the inner and outer regions of the voice coil and are coupled to the yoke. A skin conducting speaker comprising a diaphragm whose edge is supported by the housing while being in contact with an outer surface of the yoke, the skin conducting speaker comprising: a rivet tube having a center penetrated therein and configured to couple and fix a center portion of the yoke and the diaphragm; A cover assembled outside the diaphragm of the housing and having a shaft hole formed in the center thereof; One end is a contact portion which is in contact with the outer surface of the rivet tube, the connecting portion protrudes from the center of the contact portion so as to be movable to the inside of the rivet tube, the other end through the shaft hole of the cover to the outside of the cover A vibration transmission member which is drawn out and whose outer end extends laterally to form a vibration diffusion plate; A cushion member surrounding an outer surface of the vibration diffusion plate of the vibration transmission member; It characterized in that it comprises an elastic means for maintaining the contact between the contact portion and the rivet tube of the vibration transmission member in a separated state.

The elastic means has a locking projection formed on the inner lower end of the rivet pipe, it may be made of a coil spring to elastically support the connecting portion of the vibration transmission member against the locking projection, otherwise, the inner bottom of the rivet pipe A locking projection is formed at the upper surface, and may be formed of a soft elastic body elastically supporting the connecting portion of the vibration transmission member against the locking projection.

One end of the plurality of guide pins is fixedly coupled to the inner surface of the vibration diffusion plate, and the other end of the guide pin is introduced into the inside of the cover to stably support the reciprocating motion of the vibration transmission member while forming a free end. It is made up all the time.

According to another feature of the invention, the coil plate is configured to be fixed by insert injection at the inner periphery of the housing is configured so that assembly failure does not occur.

According to another feature of the invention, the coil plate is formed to have a plurality of through-holes on the front surface to facilitate the circuit connection work between the voice coil and the circuit board and to provide an effective heat dissipation structure.

According to another feature of the present invention, the magnet, yoke and diaphragm are prevented from being pushed excessively by the cushion magnet of the same polarity is seated on the upper surface of the coil plate facing the magnet.

Accordingly, the present invention, by maximizing the vibration diffusion efficiency can be heard for a long time clear sound quality of a wide range without severe stimulation, and when not worn, the sound by the acoustic vibration is leaked to the outside as it is Since the communication security can be maintained, an unpleasant noise spread due to the acoustic vibration of the high output sound can be prevented.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing the basic configuration of the skin conduction speaker according to the present invention, Figure 3 is an exploded cross-sectional view of the skin conduction speaker according to the present invention, Figure 4 shows the configuration of the coil plate of the skin conduction speaker according to the present invention Top view.

Referring to this, the skin conduction speaker 100 according to the present invention has the same basic configuration as a conventional bone conduction speaker that generates high output acoustic vibration capable of listening to voice and sound, and is fixedly installed inside the housing 20. The voice coil 40 is installed by the coil plate 30, and the magnet 50 is disposed in the inner and outer regions of the voice coil 40 so as to be coupled to the yoke 60. It is configured to include a diaphragm 70, the edge of which is supported by the housing 20 while being in contact with the outer surface of the).

In this basic configuration, the housing 20 has a cylindrical shape with upper and lower portions open, and the magnet 50, the yoke 60, and the diaphragm 70 are sequentially disposed above the voice coil 40. By riveting integrally, the magnetic circuit is constructed.

In addition, a circuit board 80 for transmitting an electrical signal to the voice coil 40 is further provided at one side of the bottom surface of the coil plate 30.

According to one feature of the present invention, a plurality of through holes 31 are formed on the front surface of the coil plate 30 so that the coil coil 41 and the circuit board 80 may be connected to each other regardless of the position of the coil wire 41. The coil wire 41 is conveniently configured to pass through the through hole 31 of the coil plate 30 so as to be connected in a circuit.

In addition, the through hole 31 of the coil plate 30 discharges heat generated in an operation process of the magnetic circuit to the outside so that heat is not accumulated in the magnet 50 so as to prevent a decrease in magnetic force while also having a heat dissipation effect. Will be exercised.

In addition, according to another feature of the present invention is configured to prevent the assembly failure between the coil plate 30, the housing 20, on which the voice coil 40 is mounted.

That is, when insert-injecting the housing 20 without assembling the coil plate 30 with the housing 20 in a simple fitting manner, the housing 20 and the housing 20 may be inserted and inserted into the coil plate 30. It is configured to prevent the assembly tolerance between the coil plate 30 to prevent the resulting product defects.

The coil plate 30 has a plurality of concave-convex portions 32 formed on the entire outer circumference of the edge so that a good insert injection operation can be made, without interrupting the injection flow according to the insert operation by the space formed therebetween, It is comprised so that the cross-sectional right angle by this uneven part 32 may increase and the magnetic flux density may increase.

On the other hand, the magnet 50 and the yoke 60 is an essential configuration for forming a magnetic circuit for generating a high-power acoustic vibration by the interaction of the electrical signal applied to the voice coil 40, the magnet 50 is A through hole 51 for rivet assembly is formed at the center to provide a disk-shaped inner magnet 52 having a predetermined outer diameter, and the ring-shaped outer magnet 53 having a diameter larger than the outer diameter of the inner magnet 52. It is configured so that a predetermined interval (G) is formed between the inner magnet 52 and the outer magnet 53.

The yoke 60 is formed in a thin plate shape, the through hole 61 is formed in the center is interposed between the diaphragm 70 and the inner magnet 52 and the outer magnet 53 is assembled.

In addition, each bottom surface of the inner magnet 52 and the outer magnet 53 is further provided with a first plate 62 and a second plate 63 for increasing the magnetic force.

The first plate 62 is formed to have an outer diameter assembled to cover the bottom surface of the inner magnet 52 and a hole for rivet assembly is formed at the center thereof, and the second plate 63 is the outer magnet 53. It consists of a ring shape that is assembled to surround the bottom of the.

In addition, the diaphragm 70 is closely adhered by a cover 22 whose outer circumference is supported by the latching jaw portion 21 formed at the inner circumference of the housing 20 and is fitted to the inner circumference of the housing 20 to the outside thereof. And installed to be integrally fixed to the housing 20.

According to the configuration of the skin precursor speaker 100 of the present invention as described above, the voice coil 40 is positioned in the gap G formed between the inner magnet 52 and the outer magnet 53 to form a magnetic circuit. And, the electrical signal applied to the voice coil 40 is to generate a high-power sound vibration.

In the basic configuration as described above, the present invention is not integrated with the mastoid and the diaphragm of the bone conduction speaker of the prior art, by constituting the acoustic vibration transmission path is separated and coupled to each other to maximize the high efficiency of the acoustic vibration efficiency This is to improve the sound quality accordingly.

Accordingly, according to one embodiment of the present invention, the vibration plate 70 is provided with a separate vibration transmission member 90 which is separated from the vibration plate 70 and reciprocates by vibration.

In order to separate and couple the vibration transmitting member 90 with the diaphragm 70, the diaphragm 70, the yoke 60 and the magnet 50 by using the rivet pipe 110 for integral assembly. It is assembled integrally.

The rivet pipe 110 has a shaft hole 111 formed in the center thereof, and upper and lower ends thereof are riveted to process the diaphragm 70, the yoke 60, the magnet 50, and the first plate 62. ) And the second plate 63 are integrally assembled to form a magnetic circuit.

In addition, the vibration transmission member 90 is composed of a contact portion 91 whose one end is in contact with the outer surface of the rivet pipe 110, the connection portion 92 protrudes from the center of the contact portion 91 is the rivet A predetermined tolerance is inserted into the shaft hole 111 of the pipe 110 to be configured to move up and down.

Then, the other end of the vibration transmitting member 90 is drawn out to the outside of the cover 22 through the shaft hole 23 formed in the center of the cover 22, from which the outer end is extended laterally The vibration diffusing plate 93 is formed.

Therefore, the shape of the vibration transmitting member 90 is preferably made in the shape of a disk such that the vibration diffusion plate 93 is in contact with the skin in a wide area when viewed in plan view, and in a "T" shape when viewed in the side view. Is done.

According to the vibration transmission member 90 having such a configuration, as compared to the acoustic vibration of the diaphragm evenly transmitted to the entire plate-shaped mastoid as in the related art, the acoustic vibration concentrated in the center of the diaphragm 70 is riveted to the tube 110. The first through the contact portion 91 of the vibration transmission member 90 in contact with the rivet pipe 110 through the connecting portion 92 is inserted into the vibration diffusion plate 93 in contact with the skin therefrom By delivering evenly to the skin through the bone conduction path to be able to hear clear sound quality without severe local irritation of the skin.

In addition, the outer surface of the vibration transmitting member 90 is further provided with a cushion member 94 for further minimizing the irritation to the skin contact, and to improve the feel of the transmission of the acoustic vibration by the skin surface contact.

The cushion member 94 may be made of sponge, silicon, or the like, and may be formed in a cover shape so as to correspond to the shape of the vibration diffusion plate 93, or may be formed by integrally protruding from the surface of the vibration diffusion plate 93. have.

According to an embodiment of the present invention having such a configuration by concentrating the acoustic vibration of the diaphragm 70 from the center of the diaphragm 70 through the path of the contact portion 91 of the vibration transmission member 90 vibration diffusion plate ( 93, a new type of acoustic vibration transmission path for listening to acoustic vibrations in a large area in contact with the skin is formed.

Accordingly, acoustic vibrations, which are bone conduction through human skin contact, are transmitted to the skin with a wide contact area, maximizing vibration spreading efficiency, and allowing a long time to hear clear sound quality in a wide range without severe stimulation. will be.

On the other hand, the skin conduction speaker 100 of the present invention as described above is worn on the head like a general headphone product, the bone conduction efficiency is to be worn in a state of being pressed with moderate elasticity to the skin contact surface around the ear with the best efficiency.

Therefore, when worn, the acoustic vibration is heard through the bone conduction path through the skin surface around the ear, but when it is not worn for a while while the acoustic vibration is being output, the conventional bone conduction speaker uses a flat mastoid. Acoustic vibration is output as it is in the form of sound in the air, which causes problems as described above.

According to another embodiment of the present invention to solve this problem, when the skin conducting speaker 100 is not worn, the vibration transmitting member 90 is configured to be in a state in which the diaphragm 70 and the adhesion state are elastically restored and separated. By suppressing the transmission of the acoustic vibration to the vibration transmission member 90 to prevent the sound caused by the acoustic vibration as it is conventionally leaked to the outside.

As a configuration for this purpose, the contact between the contact portion 91 and the rivet tube 110 of the vibration transmission member 90 to be in a separate state automatically when not wearing, when worn by the elastic An elastic means 130 for contacting the contact portion 91 and the rivet pipe 110 of the vibration transmission member 90 is further provided.

That is, as shown in FIGS. 1 and 4, the elastic means 130 further includes a locking protrusion 112 formed at an inner lower end of the rivet pipe 110, and has an impact against the locking protrusion 112. Coil spring 131 is provided is provided on the inside of the rivet pipe (110).

The lower end of the coil spring 131 is supported by the engaging protrusion 112, the upper end is configured to elastically support the connection portion 92 of the vibration transmission member (90).

In addition, according to another embodiment of the present invention, as shown in Figure 5, the elastic means 130 is the rivet pipe 110 to elastically support the connecting portion 92 against the engaging projection 112. It is made of a soft elastic body 132.

The elastic body 132 may be made of a material such as sponge or silicon, but the present embodiment is not specifically presented, but the hardness and shape of each material may be variously implemented according to the elastic force.

On the other hand, the vibration transmitting member 90 receives the acoustic vibration of the diaphragm 70 from the center to form an acoustic vibration transmission path to diffuse to the vibration diffusion plate 93, so that the vibration is maintained in accordance with the up and down reciprocating motion stably It is possible to implement the improved sound quality.

To this end, according to another feature of the present invention, a plurality of guide pins 95 are provided on the inner surface of the vibration diffusion plate 93 to maintain the up and down reciprocating motion without twisting the vibration transmission member 90 left and right. It is configured to.

One end of the guide pin 95 is fixed to the inner surface of the vibration diffusion plate 93, and the other end thereof is positioned around the shaft hole 23 of the cover 22. It is introduced to the inside through the through-hole 24 formed to correspond to the free end is formed to stably support the reciprocating motion of the vibration transmitting member (90).

The other end of the guide pin 95 is configured such that the step 96 is formed to prevent the cover 22 from being separated.

In addition, the interval between the step 96 and the inner surface of the cover 22 is greater than the vertical movement interval of the contact portion 91 and the rivet pipe 110 of the vibration transmission member 90. It is preferably made to maintain.

In addition, the magnetic circuit arranged in the housing 20 by the diaphragm 70 is configured to generate acoustic vibration by a magnetic field formed around the voice coil 40.

Therefore, when the magnet 50 and the coil plate 30 collide with each other due to an external shock or an instantaneous electric signal, a risk of breakage may occur. Therefore, a configuration for mitigating impact and preventing breakage is required. bar,

According to another feature of the present invention, at the edge of the upper surface of the coil plate 30, that is, the position corresponding to the outer magnet 53, the repulsive force acts between the outer magnets 53 with the same polarity. The magnet 50, the yoke 60, the vibration plate 70 is configured to prevent excessively being pushed toward the coil plate 30 by seating the cushion magnet 54 exhibiting the cushioning action by the magnetic force.

The magnet cushion 54 also serves to increase the force of the magnetic field by the voice coil 40 in addition to the above-described action, thereby exhibiting the effect of increasing the output of the acoustic vibration.

The action of the skin conduction speaker 100 according to the present invention by the above configuration is as follows.

As illustrated in FIGS. 6 and 7, an electrical signal related to bone conduction sound is applied to the voice coil 40 through the circuit board 80.

Magnetic fields are formed inside and outside the voice coil 40 in proportion to the strength of an applied electric signal.

The magnetic field interacts with the inner magnet 52, the outer magnet 53, and the cushion magnet 54 so that the inner magnet 52 and the outer magnet 53 have a predetermined frequency in the up and down directions and vibrate.

As such, when the inner magnet 52 and the outer magnet 53 vibrate with a predetermined frequency in the up and down directions, the vibration is transmitted to the diaphragm 70.

At this time, the diaphragm 70 is amplified largely by the characteristic that its own vibration efficiency is increased and outputs the acoustic vibration, which is concentrated and output in the central portion of the diaphragm 70.

In addition, the vibration output from the center of the diaphragm 70 is separated from the rivet pipe 110 is transmitted to the transmission member 90 assembled to enable the up and down reciprocating motion.

Here, the vibration transfer member 90 is differently changed depending on the contact state of the rivet tube 110. First, the state when the headphones are worn, the vibration diffusion plate 93 is the skin by the pressing force according to the wearing headphones The vibration transmitting member 90 is pushed back in the state in contact with the surface.

At this time, the vibration transmission member 90 is moved in a straight line without twisting from side to side by the guide pin 95 of the vibration diffusion plate 93, and thus the contact portion 91 is mutually with the rivet pipe 110. The contact state is maintained while wearing the surface contact state.

Here, even if the pressing force due to the wearing of the headphones is applied excessively, the cushioning force is not pushed further by the repulsive action of the outer magnet 53 and the magnet cushion 54, so that the magnetic circuit and the coil plate 30 collide with each other. Breakage is to be prevented.

Therefore, the acoustic vibration generated from the diaphragm 70 is concentrated through the connecting portion 92 and the contact portion 91, and the acoustic vibration of good sound quality is output to the skin through the vibration diffusion plate 93 and the cushion member 94 as they are. By delivering evenly, the user can listen to the sound by the high-quality sound vibration.

This means that if the voice signal is a good call quality on the phone call, the sound signal applied to the voice coil 40 when listening to the music is transmitted through the vibration transmitting member 90 without loss, the clear and wide range of Sound can be heard through the bone conduction path.

On the other hand, in the case of listening while not wearing headphones, conventionally, the acoustic vibration output from the diaphragm was output in the form of sound through the mastoid as it is.

However, in the present invention, the contact portion 91 and the rivet tube 110 are moved to the original position by the elastic means 130 mounted inside the rivet tube 110 at the moment when the pressing force is released according to the rivet tube 110. The acoustic vibration output from the vibration transmission member 90 is not surely transmitted.

In this state, the sound vibration output from the diaphragm 70 is weak enough to affect the vibration transmitting member 90 in a weak state so that fine vibrations are felt in the end, and are diffused into the air by sound vibrations so that they are not output in the form of sound. Will be.

Therefore, even if the user puts the headphones on the floor without wearing the headphones, the acoustic vibration is not output in the form of noise because the acoustic vibration is considered to be blocked by the standards of the deaf, hard of hearing and normal people. It will not spread to.

 In the above, the description of the embodiment for the skin conduction speaker according to the present invention is merely for the purpose of illustration, the present invention is not limited to this, of course, can be variously modified within the claims.

As described above, the skin conduction speaker according to the present invention is configured to maximize the vibration diffusion efficiency by transmitting acoustic vibrations, which are bone conduction through human skin contact, to the skin with a wide contact area. In addition, you will be able to hear clear sound quality over a wide range of frequencies for a long time.

In addition, when not worn, the sound caused by the vibration is minimally leaked to the outside, thereby maintaining communication security, and the effect of preventing the occurrence of noise due to the sound vibration when listening to high-power music.

Claims (7)

A voice coil is installed inside the housing by a coil plate, and magnets are disposed in the inner and outer regions of the voice coil to engage with the yoke, and the edge thereof is supported by the housing while being in contact with the outer surface of the yoke. In the skin conduction speaker comprising a diaphragm, A rivet tube having a center penetrated therein and configured to couple and fix the center portion of the magnet, the yoke and the diaphragm; A cover assembled outside the diaphragm of the housing and having a shaft hole formed in the center thereof; One end is a contact portion which is in contact with the outer surface of the rivet tube, the connecting portion protrudes from the center of the contact portion so as to be movable to the inside of the rivet tube, the other end through the shaft hole of the cover to the outside of the cover A vibration transmission member which is drawn out and whose outer end extends laterally to form a vibration diffusion plate; A cushion member surrounding an outer surface of the vibration diffusion plate of the vibration transmission member; Skin-conducting speaker, characterized in that it comprises an elastic means for maintaining the contact portion of the vibration transmitting member and the rivet tube in a separated state. The method of claim 1, The elastic means is a skin conduction speaker, characterized in that the engaging projection is formed on the inner lower end of the rivet tube, the coil spring to elastically support the connecting portion of the vibration transmission member against the locking projection. The method of claim 1, The elastic means is a skin conduction speaker, characterized in that the engaging projection is formed on the inner lower end of the rivet tube, made of a soft elastic body elastically supporting the connecting portion of the vibration transmission member against the locking projection. The method of claim 1, One end of the plurality of guide pins is fixedly coupled to an inner surface of the vibration diffusion plate, and the other end of the guide pin is introduced into the cover to support a reciprocating motion of the vibration transmission member while forming a free end. Skin conduction speaker, characterized in that. The method of claim 1, The coil plate is a skin conduction speaker, characterized in that the fixing by insert injection in the inner circumference of the housing. The method of claim 1, The coil plate is a skin conduction speaker, characterized in that a plurality of through-holes are formed over the entire surface. The method of claim 1, The upper surface of the coil plate is a skin conductive speaker characterized in that the cushion magnet of the same polarity facing the magnet is seated to prevent excessively pushing the magnet, yoke and diaphragm.

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