JP4541111B2 - Method of using bone conduction speaker and method of using bone conduction receiver - Google Patents

Method of using bone conduction speaker and method of using bone conduction receiver Download PDF

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JP4541111B2
JP4541111B2 JP2004332969A JP2004332969A JP4541111B2 JP 4541111 B2 JP4541111 B2 JP 4541111B2 JP 2004332969 A JP2004332969 A JP 2004332969A JP 2004332969 A JP2004332969 A JP 2004332969A JP 4541111 B2 JP4541111 B2 JP 4541111B2
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bone conduction
tragus
surface
conduction speaker
speaker
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JP2006148295A (en
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光男 田村
裕司 細井
善幸 阿部
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Necトーキン株式会社
裕司 細井
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  The present invention mainly relates to a method for using a bone conduction speaker for generating acoustic vibration and a method for using a bone conduction receiver.

  There are two types of receivers that transmit sound information to the inner ear, which is a human auditory organ, of the air-conducting type and the bone-conducting type depending on the difference of the vibrating body that forms the sound generating unit (speaker). The air-conducting handset is designed to transmit sound information to the inner ear via the air conduction through the middle ear transmission system including the ear canal and the eardrum by applying an earphone to the entrance of the ear canal. The bone-conduction type handset is directly connected to the skin on the bone tissue such as the mastoid part and the mandible behind the ear, and directly through the bone tissue without going through the middle ear transmission system. Designed to transmit audio information to the inner ear.

  The feature of bone conduction receivers equipped with bone conduction speakers designed for bone conduction is that the main body is generally brought into contact with the milky process at the back of the outer ear or near the fringe with a constant pressure. Thus, the acoustic vibration generated by the bone conduction speaker of the main body is propagated to the inner ear.

  The purpose of using such a bone conduction receiver is mainly as a hearing aid for the hearing impaired when the function of the middle ear is reduced, capturing external sound with a microphone and amplifying it to generate bone for generating acoustic vibrations. By driving the conduction speaker, the acoustic signal is directly transmitted to the inner ear without going through the middle ear transmission system.

  Air conduction type handsets are widely used in general, but as a well-known technique related to bone conduction type handsets, for example, a bone conduction speaker is placed in a place other than the entrance of the ear canal and the ear canal is left open. A bone conduction headset having a structure capable of listening to sound information by bone conduction sound (see Patent Document 1), and a receiving device having a structure formed such that the vibration surface of the bone conduction speaker abuts on the auricle (see Patent Document 2). Etc.

Japanese Unexamined Patent Publication No. 2003-18683 (Summary, 2nd to 3rd pages, FIGS. 4 and 7) JP 2001-320790 A (summary, FIG. 1)

  In the case of the bone conduction headset according to Patent Document 1 described above, audio information by bone conduction sound is listened with the external auditory canal open, and when there is environmental noise in the surroundings, the environmental noise is released. The sound signal that enters as air conduction sound from the entrance and is often transmitted to the inner ear as bone conduction sound may be masked by the environmental noise transmitted to the inner ear via the ear canal. There is a problem that it is not suitable for use in a high environment.

  In the case of such a bone conduction headset, when used in an environment where the noise level is high, the user can place the mastoid on the back side of the auricle to prevent masking of voice information due to environmental noise. When listening with a bone conduction speaker, it is necessary to perform an operation so that the entrance of the ear canal is closed with a finger at the same time. Thus, it is inconvenient and cumbersome in handling the handset that the operation of the user is separately required depending on the use environment. Also, comparing air conduction sound with bone conduction sound, air conduction sound is superior in terms of sound quality and speech intelligibility, so air conduction receivers are generally popular and used with the ear canal open There is also a problem that the basic functions of the bone conduction type such as being able to be made are not fully utilized.

  Furthermore, in the case of a known bone conduction receiver, the bone conduction sound is basically closely related to the contact pressure of the bone conduction speaker and the head, and the stronger the pressure, the greater the tendency to hear a loud sound. Since a system using a conductive speaker needs to ensure a considerable contact force, there is a problem that the user can easily feel pain on the contact surface when used for a long time. However, in the technique according to Patent Document 2, since the vibration surface of the bone conduction speaker is in contact with the auricle, such a problem can be counteracted to some extent. When trying to do so, there is a condition that the environmental noise from the surroundings is below a certain value, and if the environmental noise exceeds a certain value, the sound that enters as air conduction sound is superior to the bone conduction sound. There is a problem that it becomes difficult to listen to the sound. As a countermeasure, there is an idea that it is sufficient to power up the sound vibration of bone conduction sound so as to overcome external environmental noise, but in reality, many bone conduction devices are portable. In addition to the limitation that there is a limit to the energy that can be supplied from the power source, etc., if a power of a certain value or more is supplied to the bone conduction speaker, strong vibrations occur and the head is uncomfortable. It is not preferable.

  The present invention has been made to solve such problems, and its technical problem is that, in an environment where the external noise level is high, transmission of voice information to the inner ear by bone conduction is performed simultaneously with blocking of environmental noise. In an environment where the sound efficiency is improved and the external noise level is low, the sound can be heard with natural sound quality with good clarity by air conduction, and the user can feel a pain on the contact surface even if used for a long time. An object of the present invention is to provide a bone conduction speaker and a bone conduction receiver having a simple structure that can be used comfortably.

  According to the present invention, in the bone conduction speaker for generating acoustic vibration, the vibration surface is configured to abut on the tragus, the vibrating body having the vibration surface is provided in the housing, and The vibration surface having a shape in which at least a part of the vibration surface protrudes from the housing surface so as to be easily applied, the vibration body having the vibration surface has a structure in which the surface of the piezoelectric bimorph element is covered with an organic substance, and By adjusting the contact pressure between the vibrating surface and the tragus, it is possible to change the transmission ratio of voice information via cartilage guidance and air conduction according to the magnitude of external noise. A bone conduction speaker is obtained.

  Further, according to the present invention, in the bone conduction speaker, the vibration surface is a depression including the antiauricular ring, the antitragus, and the concha cavity surrounded by the tragus, while closing the external auditory canal while pressing the tragus. A bone-conducting speaker having a shape and size that fits in a certain ear cavity is obtained.

  Furthermore, according to the present invention, in the bone conduction speaker, a bone conduction speaker having a vibration surface having a width dimension in a range of 0.5 to 3.5 cm is obtained.

In addition, according to the present invention, in the bone conduction receiver including the bone conduction speaker for generating acoustic vibration, the bone conduction speaker is configured such that the vibration surface abuts on the tragus, and the vibration having the vibration surface. together comprising comprises a body housing at least a portion of the vibrating surface to facilitate Ategai the tragus is Chi lifting a shape protruding than the housing surface, the vibrating body having a vibrating surface, the piezoelectric The bimorph element has a structure in which the surface of the bimorph element is covered with an organic substance, and by adjusting the pressure of contact between the vibrating surface of the vibrating body and the tragus, audio information via the cartilage guide can be adjusted according to the level of external noise. It is possible to obtain a bone conduction receiver that is configured to be capable of changing a transmission ratio of voice information via air conduction.

  According to the present invention, in the above-described bone conduction receiver, the bone conduction speaker closes the external auditory canal while the vibration surface presses the tragus and surrounds the antiauricle, the antitragus, and the concha surrounded by the tragus. A bone conduction receiver having a shape and a size that can be accommodated in an ear cavity, which is a cavity including a cavity, is obtained.

  Furthermore, according to the present invention, in the bone conduction receiver, the bone conduction speaker is obtained such that the vibration surface has a width dimension in the range of 0.5 to 3.5 cm.

On the other hand, according to the present invention, in the bone conduction receiver, the bone conduction speaker includes pressure adjusting means for adjusting a pressure abutting on the tragus, and the pressure adjusting means includes the fixing band and the vibration. A frame-shaped support provided between the bodies, a leaf spring disposed in the support and in contact with the vibrating body, and fixed to the support and in contact with the vibrating body It is preferable to have an adjusting screw for adjusting the urging force of the leaf spring .

On the other hand, according to the present invention, in any one of the above bone conduction receivers, the bone conduction speaker is one sound uttering unit for generating voice information via the air conduction and transmitting it to the inner ear. , bone conduction receiver device is obtained which utilizes the sound transmission path through the cartilage guide for transmitting the voice information to the inner ear through the cartilage of the tragus.

Further, according to the present invention, in the above-mentioned bone conduction receiver apparatus, sound utterance section, the with the sound transmission path through the cartilage guide, the gas for transmitting the voice information ear canal, through the middle ear to the inner ear A bone conduction receiving device having a dual path transmission function using both of the sound transmission paths via the lead is obtained.

  Furthermore, according to the present invention, a portable communication device, a voice communication device, a telephone set, or a hearing aid device provided with any one of the above bone conduction receivers can be obtained.

  In the case of the bone conduction speaker of the present invention, the vibration surface is basically configured so as to contact the tragus, and the vibration surface closes the external auditory canal while pressing the tragus, and the dents of the ear (the anti-ring, the anti-pearl). , Which shows a depression including the concha cavity surrounded by the tragus), and has a width dimension in the range of 0.5 to 3.5 cm, Since the vibration surface has a shape in which at least a part of the vibration surface protrudes from the housing surface so that it can be easily applied to the beads, the surface of the piezoelectric bimorph element is covered with an organic substance. Even in an environment where the magnitude of the noise changes every moment, the optimal voice via the tragus cartilage and air conduction can be adjusted at any time by instantaneously adjusting the pressure with which the vibrating surface of the vibrating body comes into contact with the tragus. An information transmission ratio is obtained and applied to the tragus. So the audio information is obtained in an optimum state without becoming painful contact surface even when used for a long time when the.

  Also, in the case of the bone conduction receiver provided with the bone conduction speaker of the present invention, the vibration surface is similarly in contact with the tragus as the bone conduction speaker, and the vibration surface presses the tragus. In order to close the external auditory canal and fit in the dent of the ear, it is formed to have a width dimension in the range of at least 0.5 to 3.5 cm, and at least a part of the vibrating surface is easily fitted to the tragus. In addition to a structure having a shape protruding from the body surface, it is attached to a fixing band using the head, and further includes a pressure adjusting means for adjusting the pressure abutting on the tragus, and the vibration surface. Since the basic structure of the vibrating body with a piezoelectric bimorph element is covered with an organic substance, environmental noise increases when listening to bone conduction sound, and even under conditions where it is difficult to hear bone conduction sound. In an environment where the external noise level is high, it is possible to increase the bone conduction sound ratio easily by increasing the bone conduction sound ratio without increasing the input power to the bone conduction speaker due to the high contact pressure. At the same time that the environmental noise is blocked, the transmission efficiency of voice information to the inner ear by bone conduction is improved, and in an environment with a low external noise level, the voice can be heard with natural sound quality with good clarity by air conduction. As a result, the balance between the bone conduction sound from the tragus cartilage and the air conduction sound via the external auditory canal is adjusted according to the environmental noise with a simple structure regardless of the usage environment such as when the external noise level is high In addition, it is possible to listen to the voice with natural sound quality with good clarity and to use it comfortably without feeling painful on the contact surface of the bone conduction speaker even if the user uses it for a long time.

  Furthermore, in the case of the bone conduction receiver according to the present invention, the bone conduction speaker is based on the use of a sound transmission path via cartilage guidance for transmitting voice information to the inner ear via the tragus cartilage, and voice. As a sound generation unit for generating and transmitting information to the inner ear, a sound transmission path via air conduction for transmitting voice information to the inner ear via the external auditory canal and the middle ear as well as a sound transmission path via the cartilage guide In this case, the voice can be heard with natural sound quality with better clarity, and the basic functions of the bone conduction type are fully utilized. It will be cut. Therefore, according to the bone conduction receiving device of the present invention, the conventional air conduction receiving device mainly using the air conduction sound is used to block the external auditory canal, whereas the bone conduction receiving device using the bone conduction type is characterized. In order to make full use of the advantage of being able to listen to sound with the external auditory canal open, for example, in the future, it can be expected to be used as a means of information transmission in the field of outdoor activities such as military, police, firefighting and leisure. .

  The bone conduction speaker for generating acoustic vibration according to the best mode of the present invention is configured such that the vibration surface comes into contact with the tragus. However, in this bone conduction speaker, the vibration surface presses the tragus so as to close the external auditory canal so that it fits in the ear cavity, which is the cavity including the antiauricle, the antitragus, and the concha cavity surrounded by the tragus. As a simple shape and size, it is formed to have a width dimension in the range of 0.5 to 3.5 cm (usually the size of the abdomen of the index finger is optimal) and to be easily applied to the tragus It is preferable that at least a part of the vibration surface has a shape protruding from the housing surface. By the way, as the size of the part where the vibration surface abuts the tragus, if the width exceeds 3.5 cm, it also becomes difficult to press the auricle and press it, and if it is less than 0.5, the pressure is applied only to the narrow part It is not preferable because it causes a feeling of discomfort. Furthermore, the basic structure of the bone conduction speaker is a structure in which the surface of the piezoelectric bimorph element is covered with an organic substance so that the contact surface does not hurt even if it is used for a long time when in contact with the tragus. It is also preferable that

  FIG. 1 is an external configuration diagram showing an example of a bone conduction speaker according to the best mode of the present invention. FIG. 1 (a) relates to a plan view and FIG. 1 (b) relates to a side view. This bone conduction speaker has a substantially elliptical cross section in which the vibration surface of the vibrating body 10 protrudes and protrudes more smoothly than the end surface of the housing 11.

  FIG. 2 is an external configuration diagram showing another example of the bone conduction speaker according to the best mode of the present invention, in which FIG. 2 (a) relates to a plan view and FIG. 2 (b) relates to a side view. . This bone conduction speaker has a substantially rectangular cross section in which the vibrating surface of the vibrating body 12 protrudes so as to be flatter than the end surface of the housing 13 and the corner portion is trimmed.

  FIG. 3 is a schematic view showing a use state of the bone conduction speaker shown in FIG. Here, when the bone conduction speaker (the housing 11) is held by hand, even in an environment in which the magnitude of external noise changes every moment, the pressure with which the vibrating surface of the vibrating body 10 is brought into contact with the tragus is manually adjusted. By adjusting instantaneously, the optimal voice information transmission ratio between the tragus cartilage and air conduction can be obtained at any time, and the voice information can be obtained in the optimal state (using the bone conduction speaker shown in FIG. 2). Is also the same).

By the way, the structure and the form of use of the bone conduction speaker shown in FIGS. 1A and 1B and FIGS. 2A and 2B are merely examples, and can be variously changed. For example, when the vibrator is not in use, it is accommodated in an end side local portion in a somewhat larger casing (in this case, it is preferable that the vibrator does not protrude from the outer surface of the casing), and a sliding operation is performed during use. The slide-type eject mechanism that can be pulled out and projected outward from the housing and locked (if a spring mechanism is further introduced to bias the vibrating body, the vibration surface of the vibrating body is moved from the surface of the housing. It is also possible to provide a rotating eject mechanism that can be locked by operating the operating portion to partially rotate and projecting during use. . In any case, the vibration surface of the vibrating body can be brought into contact with the tragus as described with reference to FIG.

  In addition, also in the bone conduction receiver provided with the bone conduction speaker for generating acoustic vibration according to the present invention assumed to be applied to, for example, a mobile phone, the vibration surface of the bone conduction speaker similarly abuts on the tragus. Configured such that the vibrating surface closes the ear canal with the tragus pressed, and fits in the dent of the ear (showing the cavities including the anti-annular ring, the pearl and the concha cavity surrounded by the tragus) The shape and size are formed so as to have a width dimension in the range of 0.5 to 3.5 cm, and at least a part of the vibration surface protrudes from the housing surface so as to be easily applied to the tragus. It has a structure to have. Further, in the bone conduction receiver assumed to be applied to a headset, the bone conduction speaker is attached to a fixing band using the head, in addition to the configuration in which the vibration surface abuts on the tragus. It is configured with pressure adjustment means to adjust the pressure that contacts the pearl, and when listening to bone conduction sound, environmental noise increases and it is difficult to hear bone conduction sound. The ratio of the bone conduction sound can be easily increased without increasing the input power to the bone conduction speaker to increase the audibility of the bone conduction sound. In the bone conduction speaker of these bone conduction receivers, it is preferable that the vibrating body having the vibration surface has a structure in which the surface of the piezoelectric bimorph element is covered with an organic substance.

  Furthermore, in the case of the bone conduction receiver according to the present invention, the bone conduction speaker is based on the use of a sound transmission path via cartilage guidance for transmitting voice information to the inner ear via the tragus cartilage, and voice. As a sound generation unit for uttering information and transmitting it to the inner ear, a sound transmission path via air conduction for transmitting voice information to the inner ear via the external auditory canal and the middle ear as well as a sound transmission path via the cartilage guide It is set as the structure with the dual path | route transmission function which utilizes both. In this case, it is possible to listen to the sound with natural sound quality with a high degree of intelligibility, and the basic functions of the bone conduction type can be fully utilized without any conventional.

  That is, when the tragus contact type cartilage conduction receiver according to the present invention is used, in a noisy environment with high external noise, the audio signal from the bone conduction speaker is transmitted to the tragus by bringing the bone conduction speaker into strong contact with the tragus. Sound can be transmitted efficiently from the cartilage to the inner ear via the bone guide, and when the bone conduction speaker is in strong contact with the tragus, the tragus is bent over the ear canal opening and closes the ear canal opening. Cut off noise. Since these two functions are combined, the signal-to-noise ratio is greatly improved, so that an audio signal can be accurately captured.

  On the other hand, in a quiet environment with low external noise, by reducing the force with which the bone conduction speaker comes into contact with the tragus, the voice information from the tragus cartilage enters the inner ear through the external auditory canal and the middle ear transmission system. The amount of audio information that enters the inner ear is relatively large, and the proportion of natural audio information with good sound quality from the air guide increases. In this case, since the force of contacting the tragus is weak, the tragus is not bent and does not cover the mouth of the ear canal, and sound information of the outside world can be heard at the same time.

  FIG. 4 is a perspective view showing an external configuration of a bone conduction speaker provided in the bone conduction receiver according to Embodiment 1 of the present invention.

  This bone conduction speaker has a structure in which a lead wire 2 is connected to a rectangular plate-shaped main body 1 having dimensions of 15 mm in length (width) × 30 mm in width (length) × 3 mm in thickness. The main body 1 is a piezoelectric bimorph. This is an acoustic vibration generating element (vibrating body) having a structure in which the surface of the element is covered with an organic substance (organic substance film). However, the shape, dimensions, material, acoustic vibration generation type, etc. of the bone conduction speaker here are not limited to those exemplified.

  FIG. 5 is a schematic diagram showing a measurement system of a listening experiment in which a headphone 3 that is listened to with a normal air conduction sound is attached to the ear on the opposite side in order to examine the audibility in the main body 1 of the bone conduction speaker as the acoustic vibration generating element. FIG.

  That is, in FIG. 5, the body part 1 of the bone conduction speaker is attached to the left ear, and how the acoustic signal can be recognized is applied to the right ear with the headphone 3 that listens to the normal air conduction sound for comparison. The input voltage of the right headphone 3 to be listened to by the air conduction sound is kept at a constant input level so that each part around the outer ear is in contact with being driven at a constant input voltage and can be heard as much as the intensity of the recognized sound. The figure shows a state in which the frequency is adjusted from 100 Hz to 10 kHz, and the audible level that can be heard through bone conduction is examined as an equivalent sound pressure level from the relationship between the input voltage and the output level that have been correlated in advance. Also, in order to confirm the dependency of the contact pressure on the main body 1 of the bone conduction speaker, the pressing force of the contact is divided into 50 g and 200 g, and the frequency is set at a constant interval from 100 Hz to 10 kHz by this method. The same measurement was repeated with changes.

  FIG. 6 shows the locations of measurement points in each part around the ear in a listening experiment for examining the relationship between the audibility of bone conduction and the position where the main body part 1 of the bone conduction speaker is brought into contact with the measurement system described above. .

  In FIG. 6, a state in which the milky process E1, the posterior cartilage surface E2, the tragus E3, the tragus E3, and the raised part E4 of the anterior tragus are selected as the measurement points in each part around the ear. Show.

  FIG. 7 shows the experimental results of the respective parts around the ear described above in relation to the audible sound pressure (dB) with respect to the frequency (Hz). FIG. 7 (a) relates to the mastoid protrusion E1, FIG. (b) relates to the posterior cartilage surface E2 of the outer ear mouth, (c) relates to the tragus E3, and (d) relates to the raised portion E4.

  From the experimental results shown in FIGS. 7A to 7D, when the position where the body portion 1 of the bone conduction speaker which is an acoustic vibration generating element is pressed is the portion of the tragus E3 as shown in FIG. 7C. It was found that the highest audibility was obtained, especially when the pressing pressure was increased, the rise of the bass portion was greater than in other positions. Thereby, it is estimated that the acoustic vibration is efficiently transmitted to the inner ear via the cartilage of the tragus E3. Further, when the pressing pressure is increased, the tragus E3 covers the ear canal mouth and closes the ear canal mouth. It was confirmed that it worked to feel a large (especially low frequency band), and the auditory sound pressure could be increased. That is, the comparison result by experiment of Fig.7 (a)-(d) shows that it is a big improvement in the hearing of bone conduction to make it the structure which abuts the vibration surface in the main-body part 1 of a bone conduction speaker to the tragus E3. Suggests that

  FIG. 8 shows, based on these facts, the bone conduction speaker main body 1 described above as the bone conduction receiver according to the first embodiment of the present invention abuts against the tragus E3 by the spring pressure, and the pressure can be adjusted. It is the schematic which showed the prototype of the headset form which listens on a head by the structure provided with the various pressure adjustment means.

  This bone-conduction receiving device in the form of a headset has a bone-conducting speaker main body 1 (the surface of the above-described piezoelectric bimorph element is made of an organic substance) via a hinge mechanism 5 on a head arm 4 which is a fixing band using the head. The lead wire 2 is schematically shown) and is attached to the outside of the main body 1 as a pressure adjusting means for adjusting the pressure of contact of the main body 1 with the tragus E3. An adjustment screw 8 is fixed to a frame-shaped support 6 that is fixedly arranged between the head arm 4 and a leaf spring 7 that is provided in the support 6 and abuts against the main body 1. A structure in which the force is adjusted by the adjusting screw 8 is provided.

  That is, in the case of this bone conduction receiving device in the form of a headset, the head arm 4 is placed on the head and the bone conduction speaker main body 1 is in contact with the tragus E3 in accordance with the rotary operation of the adjustment screw 8 knob. Since the urging force of the leaf spring 7 that urges the main body 1 can be adjusted, the balance of bone conduction sound with respect to environmental noise can be easily adjusted according to the use environment (external environment). Therefore, according to the bone conduction receiving device in the form of the headset, the body portion 1 of the bone conduction speaker has a soft and good touch feeling that combines a piezoelectric element (piezoelectric bimorph element) and an organic substance. The acoustic impedance matching with the cartilage portion is good by being in contact with E3 (as described above, when listening to bone conduction, environmental noise increases, and even under conditions where it is difficult to hear bone conduction sound, it is relatively weak. (This indicates that the ratio of bone conduction sound can be easily increased without increasing the input power to the bone conduction speaker by contact pressure, and the audibility of bone conduction sound can be increased.) can do.

  It should be noted that the detailed configuration of the pressure adjusting means in the headset-type bone conduction receiver shown in FIG. 8 is merely an example, and is not limited to this. The body portion 1 of the bone conduction speaker is the tragus E3. Any other configuration may be applied as long as it can adjust (control) the pressure abutting on the surface. For example, it is possible to adopt a configuration in which the elastic force of the band portion of the headset 4 is used to control it, and a configuration in which the contact pressure can be easily adjusted by being attached to the vine portion of the glasses similarly to this principle. It is also possible. It is also possible to adjust the contact pressure more simply by hand. In any case, the bone conduction receiver of the present invention is based on the use of a sound transmission path via the cartilage guide for transmitting voice information to the inner ear via the tragus cartilage for the bone conduction speaker. However, in a receiver to which such a bone conduction receiver is applied, as a sound uttering unit for generating voice information and transmitting it to the inner ear, along with the sound transmission path via the cartilage guide, the ear canal and the middle ear It can also be applied as a configuration having a dual-path transmission function that uses both sound transmission paths via air conduction for transmitting voice information to the inner ear via the.

  In the case of the bone conduction receiver of the present invention, it is effective to be applied to a portable communication device, a voice communication device, or a telephone, and to a hearing aid device represented by an assistive device for a hearing impaired person such as a hearing aid. Is also effective.

It is the external appearance block diagram which showed an example of the bone conduction speaker which concerns on the best form of this invention, (a) is related with a top view, (b) is related with a side view. It is the external appearance block diagram which showed the other example of the bone-conduction speaker which concerns on the best form of this invention, (a) is related with a top view, (b) is related with a side view. It is the schematic diagram which showed the use condition of the bone-conduction speaker shown in FIG. It is the perspective view which showed the external appearance structure of the bone conduction speaker with which the bone conduction receiver which concerns on Example 1 of this invention is equipped. FIG. 5 is a schematic diagram showing a measurement system in which headphones for listening with normal air conduction sound are attached to a half-paired ear in a listening experiment system for examining the audibility of the bone conduction speaker shown in FIG. 4. FIG. 6 shows the locations of the measurement points in each part around the ear in order to investigate the relationship between the audibility of bone conduction and the position where the bone conduction speaker contacts with the measurement system shown in FIG. FIG. 6 shows the result of the experiment at each part around the ear shown in FIG. 6 in terms of the relationship of the auditory sound pressure to the frequency, (a) is related to the mastoid process, (b) is related to the cartilage surface of the rear ear canal, (c ) Relates to the tragus, and (d) relates to the raised part. As the bone conduction receiver according to the first embodiment of the present invention, the bone conduction speaker main body shown in FIG. 4 is in contact with the tragus with the spring pressure and includes a pressure adjustment means capable of adjusting the pressure. It is the schematic which showed the prototype of the headset form which listens on a head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main-body part 2 Lead wire 3 Headphone 4 Head arm 5 Hinge mechanism part 6 Support tool 7 Leaf spring 8 Adjustment screw 10,12 Vibrating body 11,13 Case

Claims (14)

  1. The housing includes a vibrating body having a vibrating surface that comes into contact with the tragus, and at least a part of the vibrating surface has a shape protruding from the housing surface so that the vibrating surface can be easily applied to the tragus. , vibrator having a vibration surface, using a bone conduction speaker for acoustic vibration generating to have a structure obtained by coating the surface of the piezoelectric bimorph element in organic,
    By adjusting the abutting pressure between the vibrating surface and the tragus by a manual operation, characterized in that to change the transmission ratio of the audio information via the audio information and air conduction via cartilage guide in accordance with the magnitude of the external noise How to use the bone conduction speaker .
  2. 2. The method of using a bone conduction speaker according to claim 1, wherein the vibration surface closes the external auditory canal in a state where the tragus is pressed and includes an antiauricle, an antitragus, and a concha cavity surrounded by the tragus. A method of using a bone conduction speaker , characterized by having a shape and a size that can be accommodated in an ear cavity.
  3. In using the bone conduction speaker according to claim 2, wherein the vibration surface, the use of a bone conduction speaker, wherein a is formed to have a width in the range of 0.5~3.5Cm.
  4. The housing includes a vibrating body having a vibrating surface that comes into contact with the tragus, and at least a part of the vibrating surface has a shape protruding from the housing surface so that the vibrating surface can be easily applied to the tragus. , vibrator having a vibration surface, using a bone conduction receiver device having a bone conduction speaker for acoustic vibration generating to have a structure obtained by coating the surface of the piezoelectric bimorph element in organic,
    By adjusting the abutting pressure between the vibration surface and the tragus of the vibrating member by a manual operation to change the transmission ratio of the audio information via the audio information and air conduction via cartilage guide in accordance with the magnitude of the external noise A method for using the bone conduction receiver.
  5. In a bone conduction speaker comprising: a bone conduction speaker for generating acoustic vibration; and a fixing band provided on the bone conduction speaker and fixing the bone conduction speaker to a user's head .
    The bone conduction speaker is
    A housing,
    Provided in the housing, having a structure in which the surface of the piezoelectric bimorph element is covered with an organic substance, having a vibration surface that comes into contact with the tragus, and at least in the vibration surface so that the vibration surface can be easily applied to the tragus A vibrating body having a shape partially protruding from the housing surface;
    A pressure adjusting means for adjusting a pressure abutting on the tragus of the vibrating body provided in the housing;
    With
    The pressure adjusting means is
    A frame-shaped support provided between the fixing band and the vibrator;
    A leaf spring disposed in the support and in contact with the vibrating body;
    An adjustment screw that adjusts the urging force of the leaf spring fixed to the support and abutted against the vibrating body;
    By adjusting the pressure at which the vibrating surface of the vibrating body abuts on the tragus using the pressure adjusting means, the voice information via the cartilage guide and the voice information via the air guide are transmitted according to the magnitude of the external noise. A bone conduction receiver characterized in that the ratio can be changed.
  6. The bone conduction speaker according to claim 5 , wherein the bone conduction speaker closes the external auditory canal while the vibration surface presses the tragus and closes the ear canal, the tragus, and the concha cavity surrounded by the tragus. A bone conduction receiver having a shape and a size that can be accommodated in a dent of an ear that is a dent including
  7.   7. The bone conduction receiver according to claim 6, wherein the bone conduction speaker is formed so that the vibration surface has a width dimension in a range of 0.5 to 3.5 cm.
  8. 6. The bone conduction receiver according to claim 5 , wherein the bone conduction speaker is attached to a fixing band using a head.
  9. The bone conduction receiver according to any one of claims 5 to 8, wherein the bone conduction speaker is one sound uttering unit for generating voice information via the air conduction and transmitting it to the inner ear. In addition, the bone conduction receiver is characterized in that it uses a sound transmission path via the cartilage guide for transmitting the audio information to the inner ear via the cartilage of the tragus.
  10.   The bone conduction receiver according to claim 9, wherein the sound uttering unit transmits the audio information to the inner ear via the external auditory canal and the middle ear together with the sound transmission path via the cartilage guide. A bone conduction receiver having a dual-path transmission function using both sound transmission paths.
  11. A portable communication device comprising the bone conduction receiver according to any one of claims 5 to 10.
  12. A voice communication device comprising the bone conduction receiver according to any one of claims 5 to 10.
  13. A telephone comprising the bone conduction receiver according to any one of claims 5 to 10.
  14. A hearing aid device comprising the bone conduction receiver according to any one of claims 5 to 10.
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