WO2016098381A1 - Microphone to be worn in external auditory meatus - Google Patents

Microphone to be worn in external auditory meatus Download PDF

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Publication number
WO2016098381A1
WO2016098381A1 PCT/JP2015/072814 JP2015072814W WO2016098381A1 WO 2016098381 A1 WO2016098381 A1 WO 2016098381A1 JP 2015072814 W JP2015072814 W JP 2015072814W WO 2016098381 A1 WO2016098381 A1 WO 2016098381A1
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WO
WIPO (PCT)
Prior art keywords
housing
space
hole
sound
microphone
Prior art date
Application number
PCT/JP2015/072814
Other languages
French (fr)
Japanese (ja)
Inventor
英司 松山
Original Assignee
スター精密株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by スター精密株式会社 filed Critical スター精密株式会社
Publication of WO2016098381A1 publication Critical patent/WO2016098381A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/021—Measuring pressure in heart or blood vessels
    • A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/0245—Detecting, measuring or recording pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones

Definitions

  • the present invention relates to an ear canal-mounted microphone that is used while being mounted on the ear canal, and more particularly to an ear canal-mounted microphone that is suitable for collecting body sounds.
  • Patent Document 1 a medical device and a health care device including a microphone for collecting a body sound such as a heartbeat are known.
  • Patent Document 2 describes an ear canal-mounted microphone used in such a state that it is worn on the ear canal.
  • Patent Document 2 has a configuration in which a microphone unit is housed in a casing together with a speaker unit.
  • the microphone unit has a configuration including a diaphragm and a housing configured to form a front space and a back space on both sides of the diaphragm.
  • Physiological sounds such as heartbeats are detected as low-frequency acoustic signals, but in order to increase sound pressure sensitivity in the low-frequency band, it is desirable to make the diaphragm easy to vibrate by making the diaphragm stiffness as small as possible.
  • the rear space of the housing that is, the space opposite to the front space where the sound collecting holes are located
  • the housing that accommodates the housing will also increase in size, and as a result, the ear canal-equipped microphone is not easily worn on the ear canal and is not suitable for long-term use. turn into.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide an ear canal-equipped microphone that can achieve both high sensitivity in a low frequency band and miniaturization of a housing. Is.
  • the above-described object is achieved by devising the configuration of the microphone unit after the internal space of the housing is configured as a sealed space.
  • the ear canal wearing microphone is an ear canal wearing microphone including a housing having a sound guide hole formed in a front end portion thereof, and a microphone unit housed in the housing.
  • the microphone unit includes a diaphragm and a housing configured to form a front space and a back space on both sides of the diaphragm.
  • a sound collection hole and a vent hole are formed to communicate each of the front space and the back space with the external space of the housing, and the internal space of the housing communicates with the front space and the sound guide hole. It is partitioned into a space and a second space communicating with the back space.
  • ear canal wearing type microphone may be configured to be used in a state where the ear tip attached to the front end portion of the housing is inserted into the ear canal, or the front end portion of the housing itself is inserted into the ear canal. It may be configured to be used in such a state.
  • the term indicating the directionality such as “front end portion” is used for the sake of convenience in order to clarify the positional relationship between members constituting the ear canal-mounted microphone.
  • the directionality when actually using is not limited.
  • the microphone unit has a configuration in which a microscopic hole for pressure adjustment is formed in the diaphragm or the like.
  • the “partition” is divided into “first space” and “second space”. “It is defined” means that portions other than the micropores are partitioned.
  • the internal space of the housing is configured as a sealed space, and the front space and the back space of the microphone unit housed in the housing Sound collecting holes and vent holes are formed to communicate (i.e., spatially connect) each of the housing with the external space of the housing, and the internal space of the housing communicates with the front space and the sound guide hole of the housing. Since the first space and the second space communicating with the back space of the housing are partitioned, the following operational effects can be obtained.
  • the second space communicating with the rear space of the housing is formed in a state of being isolated from the front space of the housing. It can be expanded to secure a large space. Therefore, the stiffness of the diaphragm can be reduced to make it easier to vibrate, thereby increasing the sound pressure sensitivity in the low frequency band. Moreover, this can be realized without increasing the size of the housing.
  • the internal space of the housing is configured as a sealed space, so that an external environment such as a wind noise is collected when a living body sound is collected even though a ventilation hole is formed in the housing of the microphone unit. You can avoid being affected by sound.
  • both high sensitivity in the low frequency band and miniaturization of the housing can be achieved.
  • a gasket is disposed at the front end portion in the casing, and a through hole is formed in the gasket to communicate the internal space of the casing with the sound guide hole. If the sound collecting nozzle formed so as to surround the sound collecting hole is attached and the sound collecting nozzle is inserted into the through hole, the following operational effects can be obtained.
  • the sound collecting hole of the microphone unit can be reliably communicated with the sound conducting hole of the housing by the gasket and the sound collecting nozzle.
  • the partition between the first space and the second space can be realized with a simple configuration.
  • a gasket is disposed at the front end portion in the housing, and a through hole is formed in the gasket so that the internal space of the housing communicates with the sound guide hole.
  • a sound collecting nozzle formed so as to surround the sound collecting hole is attached, and the rear end portion of the tubular member extending in the front-rear direction is connected to the sound collecting nozzle, and the front end portion of the tubular member is inserted into the through hole.
  • the sound collecting hole of the microphone unit can be reliably communicated with the sound guiding hole of the casing by the gasket, the sound collecting nozzle and the cylindrical member.
  • the partition between the first space and the second space can be realized with a relatively simple configuration, and the degree of freedom of arrangement of the microphone unit can be increased.
  • the speaker unit is arranged in the housing, and the sound emitting nozzle formed so as to surround the sound emitting hole is attached to the speaker unit. If the second through hole that communicates the internal space of the body with the sound guide hole is formed at a distance from the through hole, and the sound emitting nozzle is inserted into the second through hole, Such effects can be obtained.
  • the sound emitting hole of the speaker unit can be reliably communicated with the sound conducting hole of the housing by the gasket and the sound emitting nozzle. Therefore, even when the speaker unit is additionally arranged in the housing, the first space and the second space can be partitioned. Further, by adopting a configuration in which the speaker unit is arranged in the housing in this way, it is possible to collect a biological sound while enjoying or utilizing music output from the speaker unit.
  • the internal space of the cylindrical member is output from the speaker unit.
  • FIG. 1 is a side sectional view showing an ear canal wearing microphone according to an embodiment of the present invention.
  • Side sectional view showing in detail the configuration of the microphone unit in the above-mentioned external ear canal type microphone
  • FIG. 1 which shows the 1st modification of the said embodiment.
  • FIG. 1 which shows the 2nd modification of the said embodiment.
  • FIG. 1 which shows the 3rd modification of the said embodiment.
  • FIG. 1 is a side sectional view showing an ear canal-mounted microphone 10 according to an embodiment of the present invention.
  • the ear canal-mounted microphone 10 is housed in a housing 12 having a sound guide hole 12a formed in a front end portion (right end portion in FIG. 1), and the housing 12.
  • the microphone unit 14 and an ear tip 16 attached to the front end of the housing 12 are provided.
  • the ear canal-mounted microphone 10 is used to collect a body sound such as a heartbeat or a pulse sound while the ear tip 16 is mounted on the ear canal.
  • the housing 12 has a configuration in which a front member 12A and a rear member 12B are joined.
  • the front member 12A and the rear member 12B are both made of a hard material such as aluminum or hard resin.
  • the front member 12A is formed so that the diameter decreases toward the front, and a small-diameter cylindrical portion 12Ab protruding forward is formed at the center of the front end wall 12Aa.
  • the sound guide hole 12a is formed in the small diameter cylindrical portion 12Ab, and the ear tip 16 is attached to the small diameter cylindrical portion 12Ab.
  • the rear end surface 12Ac of the front member 12A is formed in an annular shape. Further, the inner peripheral surface 12Ad of the front member 12A is configured by a cylindrical surface whose diameter increases in two steps toward the rear.
  • the rear member 12B is configured as a bottomed cylindrical member extending in the front-rear direction, and the rear end portion is configured as a rear end wall 12Bb.
  • the front end surface 12Ba of the rear member 12B is sealed over the entire periphery by welding, adhesion, or the like in a state where the front end surface 12Ba is in contact with the outer peripheral edge portion of the rear end surface 12Ac of the front member 12A.
  • the internal space C of the housing 12 is configured as a sealed space except for the sound guide hole 12a.
  • a gasket 18 having a cylindrical outer peripheral surface is disposed at the front end of the internal space C of the housing 12.
  • the gasket 18 is made of a soft material such as silicone resin or rubber.
  • the gasket 18 is in a state in which the outer peripheral surface thereof is fitted into the small diameter portion of the inner peripheral surface 12Ad of the front member 12A from the rear side until the front end surface contacts the front end wall 12Aa of the front member 12A. Has been inserted.
  • This gasket 18 has a front half formed in a cylindrical shape and a rear half formed in a columnar shape, and a through-hole 18a extending in the front-rear direction with a circular cross-sectional shape is formed in the center of the latter half. .
  • the through space 18a allows the internal space C of the housing 12 to communicate with the sound guide hole 12a.
  • the microphone unit 14 includes a diaphragm 22 and a housing 24 configured to form a front space Cf and a back space Cr on both front and rear sides of the diaphragm 22.
  • the housing 24 is formed with a sound collection hole 24 a and a vent hole 24 b that allow the front space Cf and the back space Cr to communicate with the external space of the housing 24.
  • a sound collecting nozzle 26 formed so as to surround the sound collecting hole 24a is attached to the housing 24 by welding or the like.
  • the microphone unit 14 is disposed along a vertical plane orthogonal to the front-rear direction, and is positioned in a state where the tip of the sound collection nozzle 26 is inserted into the through hole 18a of the gasket 18 from the rear side.
  • the internal space C of the housing 12 is divided into a first space C1 communicating with the front space Cf and the sound guide hole 12a and a second space C2 communicating with the back space Cr.
  • the positioning of the microphone unit 14 may be performed only by inserting the tip of the sound collecting nozzle 26 into the through hole 18a of the gasket 18, or the housing 24 and the inner peripheral surface 12Ad of the front member 12A.
  • a spacer (not shown) may be disposed between the large-diameter portion and a structure that supports a plurality of locations in the circumferential direction may be added.
  • the eartip 16 is made of a soft material such as silicone rubber.
  • a through hole 16a that penetrates the ear tip 16 in the front-rear direction is formed.
  • the through hole 16a communicates with the sound guide hole 12a in a state where the ear tip 16 is attached to the small diameter cylindrical portion 12Ab.
  • the through hole 16a is formed with a smaller diameter than the sound guide hole 12a.
  • the eartip 16 includes two front and rear flange portions 16A and 16B that spread in a substantially parabolic shape toward the rear side. At that time, the flange portion 16B on the rear side is formed with a larger diameter than the flange portion 16A on the front side.
  • the two front and rear flange portions 16A and 16B are brought into close contact with the wall surface of the ear canal to form a sealed space in the ear canal by the ear canal wall, the eardrum and the ear tip 16. It has become.
  • the microphone unit 14 collects sound.
  • FIG. 2 is a side sectional view showing the configuration of the microphone unit 14 in detail.
  • the microphone unit 14 is a small electret condenser microphone having a circular outer shape of about ⁇ 5 to 10 mm and a thickness of about 1 to 3 mm when viewed from the front.
  • the diaphragm 22 is housed in the housing 24 together with the support ring 32, the back electrode plate 34, the spacer 36, the conducting member 38, the insulating member 40, and the impedance conversion element 42.
  • the housing 24 includes a conductive cover 44 and a circuit board 46.
  • the conductive cover 44 is a cap-like member having a circular outer shape when viewed from the front, and is formed by pressing a metal plate.
  • the circuit board 46 has a circular shape with an outer diameter slightly smaller than the inner diameter of the conductive cover 44 in a front view, and is arranged in parallel with the front wall of the conductive cover 44.
  • An annular bent portion 44a extending so as to bend to the inner peripheral side is extended at the rear end portion of the peripheral wall of the conductive cover 44. The annular bent portion 44a is caulked and fixed to the circuit board 46. Yes.
  • the sound collecting hole 24 a of the housing 24 is formed at the center of the front wall of the conductive cover 44. Further, the air holes 24 b of the housing 24 are formed in the circuit board 46. Both of the sound collection holes 24a and the air holes 24b have a circular shape, and the air holes 24b are formed with a diameter smaller than that of the sound collection holes 24a.
  • the sound collecting holes 24a and the air holes 24b may be configured by a plurality of small holes, respectively.
  • a circular opening 26 a is formed at the tip of the sound collection nozzle 26.
  • the diaphragm 22 has a structure in which a metal vapor deposition film is formed on the front surface of the polymer film, and a micro hole 22a for adjusting the atmospheric pressure is formed at the center thereof.
  • the diaphragm 22 is supported by the support ring 32 at the outer peripheral edge portion thereof.
  • the support ring 32 is made of a thin metal plate and is formed in an annular shape.
  • the diaphragm 22 is stretched and fixed to the rear surface of the support ring 32 (that is, fixed by adhesion or the like in a tensioned state).
  • the back electrode plate 34 has a circular outer shape that is slightly smaller than the outer peripheral surface of the support ring 32 when viewed from the front, and is disposed close to the rear of the diaphragm 22.
  • the back electrode plate 34 has a configuration in which an electret layer 34a is disposed on the front surface of an electrode plate body made of a metal plate.
  • the electret layer 34a is generated by subjecting an insulating film formed on the front surface of the electrode plate body to a polarization treatment with a predetermined charge voltage, thereby applying a predetermined surface potential.
  • the back electrode plate 34 is formed with through holes 34b penetrating the back electrode plate 34 in the front-rear direction at a plurality of locations in the circumferential direction.
  • the spacer 36 is formed of a thin resin plate formed in an annular shape, and is disposed between the diaphragm 22 and the back electrode plate 34.
  • the diaphragm 22 and the electret layer 34a of the back electrode plate 34 are arranged opposite to each other in parallel via the spacer 36, so that a capacitor portion is configured.
  • the circuit board 46 is disposed behind the back electrode plate 34. Conductive layers (not shown) are formed in a predetermined pattern on both front and rear surfaces of the circuit board 46. On the rear surface of the circuit board 46, a pair of terminal portions 14a for electrically connecting the microphone unit 14 to a signal processing circuit (not shown) is formed.
  • the signal processing circuit may be arranged in the internal space C of the housing 12 together with a transceiver or the like, or a pair of cables (not shown) drawn from the housing 12 to the outside. It is good also as a structure electrically connected with the terminal part 14a.
  • the impedance conversion element 42 is mounted on the front surface of the circuit board 46. At this time, the impedance conversion element 42 is disposed at a position away from the formation position of the vent hole 24b.
  • the conducting member 38 is a substantially cylindrical member, and is arranged between the circuit board 46 and the back electrode plate 34 so as to conduct between them.
  • the insulating member 40 is an annular member and is arranged between the back electrode plate 34 and the conductive member 38 and the peripheral wall of the conductive cover 44 to insulate them.
  • the conductive cover 44 is caulked and fixed to the circuit board 46 at the annular bent portion 44 a, and the conductive layer formed on the rear surfaces of the conductive cover 44 and the circuit board 46 by the caulking is fixed. It is designed to be connected to.
  • FIG. 3 is a diagram showing a sound pressure sensitivity characteristic of the ear canal-mounted microphone 10 together with a conventional example.
  • a graph A indicated by a solid line in the figure is a graph showing a sound pressure sensitivity characteristic of the ear canal-mounted microphone 10.
  • a graph B indicated by a broken line in FIG. 5 indicates that the vent hole 24b is not formed in the housing 24 of the microphone unit 14 in the ear canal-mounted microphone 10 (that is, a conventional general microphone unit is not used). It is a graph which shows the sound pressure sensitivity characteristic of the case where it arrange
  • the heart rate is about 1 to 3 Hz compared to the case where the vent hole 24b is not formed.
  • the sensitivity level in a low frequency band of 10 Hz or less including the above band is increased by nearly 10 dB.
  • the back space Cr of the diaphragm 22 has expanded to the size of the second space C2 communicating with the rear space Cr due to the formation of the air holes 24b.
  • the expansion of the back space Cr weakens the elasticity of the back space Cr and the stiffness of the diaphragm 22 is reduced, which makes it easier to vibrate.
  • the internal space C of the housing 12 is configured as a sealed space, and the front space Cf and the back surface of the microphone unit 14 housed in the housing 12 are provided in the housing 24.
  • Sound collecting holes 24a and vent holes 24b for communicating each of the spaces Cr with the outer space of the housing 24 are formed, and the inner space C of the housing 12 is formed in the front space Cf and the sound guiding hole 12a of the housing 24. Since the first space C1 that communicates with the second space C2 that communicates with the back space Cr of the housing 24 is partitioned, the following operational effects can be obtained.
  • the second space C2 communicating with the back space Cr of the housing 24 is formed in a state of being isolated from the front space Cf of the housing 24.
  • the back space Cr can be expanded by that much to secure a large space. Therefore, the stiffness of the diaphragm 22 can be reduced to make it easier to vibrate, thereby increasing the sound pressure sensitivity in the low frequency band. Moreover, this can be realized without increasing the size of the housing 12.
  • the internal space C of the housing 12 is configured as a sealed space, the airflow is cut when the body sound is collected even though the ventilation hole 24b is formed in the housing 24 of the microphone unit 14. It can be prevented from being affected by external environmental sounds such as sound.
  • both high sensitivity in the low frequency band and miniaturization of the housing 12 can be achieved.
  • a gasket 18 is disposed at the front end portion in the housing 12, and a through hole 18 a for communicating the internal space C of the housing 12 with the sound guide hole 12 a is formed in the gasket 18. Further, a sound collecting nozzle 26 formed so as to surround the sound collecting hole 24a is attached to the housing 24 of the microphone unit 14, and the sound collecting nozzle 26 is inserted into the through hole 18a. Therefore, the following effects can be obtained.
  • the sound collection hole 24 a of the microphone unit 14 can be reliably communicated with the sound guide hole 12 a of the housing 12 by the gasket 18 and the sound collection nozzle 26.
  • the partition between the first space C1 and the second space C2 can be realized with a simple configuration.
  • the microphone unit 14 has been described as being disposed along a vertical plane orthogonal to the front-rear direction. However, the microphone unit 14 is disposed along a plane inclined with respect to the vertical plane orthogonal to the front-rear direction. It is also possible.
  • the microphone unit 14 is an electret condenser microphone
  • a microphone other than this for example, an electrodynamic microphone in which a vent hole is formed in the back space of the diaphragm. is there.
  • FIG. 4 is a view similar to FIG. 1, showing the ear canal-mounted microphone 110 according to this modification.
  • the basic configuration of the ear canal-mounted microphone 110 is the same as that of the above embodiment, except that a cylindrical member 128 is additionally arranged in the internal space C of the housing 12. This is different from the above embodiment.
  • the rear end portion of the cylindrical member 128 extending in the front-rear direction is connected to the sound collection nozzle 26 attached to the housing 24 of the microphone unit 14, and the front end portion of the cylindrical member 128 is The gasket 18 is inserted into the through hole 18 a of the gasket 18.
  • the cylindrical member 128 may be made of a hard material such as aluminum or hard resin, or may be made of a soft material such as silicone resin or rubber.
  • connection between the sound collection nozzle 26 and the cylindrical member 128 is performed by inserting the front end portion of the sound collection nozzle 26 into the rear end portion of the cylindrical member 128.
  • the sound collecting hole 24a of the microphone unit 14 can be reliably communicated with the sound conducting hole 12a of the housing 12 by the gasket 18, the sound collecting nozzle 26, and the cylindrical member 128. it can.
  • the partition between the first space C1 and the second space C2 can be realized with a relatively simple configuration. Further, the degree of freedom of arrangement of the microphone unit 14 can be increased.
  • FIG. 5 is a view similar to FIG. 1, showing the ear canal-mounted microphone 210 according to this modification.
  • the basic configuration of the ear canal-mounted microphone 210 is the same as that of the first modified example, except that a speaker unit 250 is additionally arranged in the internal space C of the housing 12. This is different from the case of the first modification. Accordingly, the configuration of the gasket 218 is different from that in the first modification.
  • the gasket 218 is formed with a second through hole 218b that communicates the internal space C of the housing 12 with the sound guide hole 12a at a distance from the through hole 218a.
  • the through hole 218a is formed at a position displaced downward from the center of the gasket 218, and the second through hole 218b is formed above the through hole 218a.
  • the rear end portion of the tubular member 128 extending in the front-rear direction is connected to the sound collecting nozzle 26 attached to the housing 24, as in the first modified example.
  • the front end portion of the cylindrical member 128 is inserted into the through hole 218a of the gasket 218.
  • the speaker unit 250 is a balanced armature type speaker, and has a structure in which a diaphragm and a drive unit (not shown) are accommodated in a housing 252.
  • the housing 252 has a substantially rectangular parallelepiped outer shape that is long in the front-rear direction, and a sound emitting hole 252a is formed at the lower end portion of the front end surface thereof.
  • a sound emitting nozzle 254 formed so as to surround the sound emitting hole 252a is attached to the front end portion of the housing 252 by welding or the like.
  • a pair of terminal portions 250a for electrically connecting the speaker unit 250 to a drive control circuit (not shown) is disposed at the rear portion of the housing 252.
  • the speaker unit 250 is positioned in a state in which the tip portion of the sound emitting nozzle 254 is inserted into the second through hole 218b of the gasket 218 from the rear side.
  • the speaker unit 250 generates a sound wave corresponding to the signal current from the drive control circuit, and radiates the sound wave to the sound guide hole 12a through the sound output hole 252a and the second through hole 218b. It has become.
  • the positioning of the speaker unit 250 may be performed only by inserting the tip of the sound emitting nozzle 254 into the second through hole 218b of the gasket 218, or the housing 252 and the inner peripheral surface of the rear member 12B.
  • a spacer (not shown) may be disposed between them to support a plurality of locations in the circumferential direction.
  • the sound emission hole 252a of the speaker unit 250 can be reliably communicated with the sound guide hole 12a of the housing 12 by the gasket 218 and the sound emission nozzle 254. Therefore, although the speaker unit 250 is additionally arranged in the internal space C of the housing 12, the first space C1 and the second space C2 can be partitioned. In addition, by adopting a configuration in which the speaker unit 250 is arranged in the internal space C of the housing 12 as described above, it is possible to collect biological sounds while enjoying or utilizing music output from the speaker unit 250. Can be done.
  • the front end portion of the cylindrical member 128 is inserted into the through hole 218a and the rear end portion thereof is connected to the sound collecting nozzle 26.
  • the internal space can be made to function as a component of a low-pass filter for making it difficult for an acoustic signal output from the speaker unit 250 to reach the sound collection hole 24a of the microphone unit 14, thereby improving sound collection performance with respect to biological sound. Can be increased. At this time, it is possible to easily finely adjust the sound pressure sensitivity by appropriately adjusting the length and the inner diameter of the cylindrical member 128.
  • the microphone unit 14 can be arranged behind the speaker unit 250. Therefore, the microphone unit 14 and the speaker unit 250 can be arranged in an overlapped state when viewed from the front, which can prevent the outer diameter of the housing 12 from increasing.
  • the speaker unit 250 is a balanced armature type speaker
  • other speakers for example, electrodynamic type speakers
  • electrodynamic type speakers may be employed.
  • FIG. 6 is a view similar to FIG. 1, showing the ear canal-mounted microphone 310 according to this modification.
  • the basic configuration of the ear canal-mounted microphone 310 is the same as that of the second modification, but the shape of the housing 312 and the arrangement of the microphone unit 14 and the speaker unit 250 are the same as those of the second modification. This is different from the second modification.
  • the sound collection nozzle 26 is not attached to the microphone unit 14 and the sound emission nozzle 254 is not attached to the speaker unit 250 as in the second modification.
  • the structure of the gasket 318 and the cylindrical member 328 differs from the case of the said 2nd modification.
  • the housing 312 of the present modification is formed with an outer diameter smaller than that of the housing 12 of the second modification.
  • the housing 312 has a configuration in which a front member 312A and a rear member 312B are joined.
  • the rear member 312B has such a shape that the rear member 12B of the second modified example is reduced. That is, the rear member 312B is configured as a bottomed cylindrical member extending in the front-rear direction, and the rear end portion is configured as the rear end wall 312Bb.
  • the front member 312A is formed in a cylindrical shape with the same diameter as the rear member 312B, and a small-diameter cylindrical portion 312Ab similar to the small-diameter cylindrical portion 12Ab of the second modified example is formed in the center portion of the front end wall 312Aa. ing.
  • casing 312 is sealed over the perimeter by welding, adhesion
  • the internal space C of the housing 312 is configured as a sealed space except for the portion of the sound guide hole 312a.
  • the front member 312 ⁇ / b> A has a slightly thicker rear end on its peripheral wall, and its inner diameter is set to be slightly larger than the outer diameter of the microphone unit 14.
  • the microphone unit 14 is fixed to the rear end portion of the peripheral wall of the front member 312 ⁇ / b> A via the seal member 360 on the outer peripheral surface of the housing 24.
  • the internal space C of the housing 312 is partitioned into a first space C1 communicating with the front space Cf and the sound guide hole 312a and a second space C2 communicating with the back space Cr.
  • the gasket 318 has a second half formed in a cylindrical shape and a first half formed in a columnar shape, and a through hole 318a extending in the front-rear direction is formed in the first half.
  • the through hole 318a is formed so as to extend downward from the center of the gasket 318.
  • the through hole 318a allows the internal space C of the housing 312 to communicate with the sound guide hole 312a.
  • the speaker unit 250 of this modification is disposed in a state where the sound emitting hole 252a is in contact with the gasket 318 so that the sound emitting hole 252a faces the through hole 318a of the gasket 318.
  • tubular member 328 of the present modification extends in the front-rear direction while being in close contact with the lower surface of the speaker unit 250, and abuts against the gasket 318 so that the front end opening thereof faces the through hole 318a of the gasket 318. Arranged in a state.
  • the tubular member 328 is formed to be shorter than the tubular member 128 of the second modified example.
  • the sound collection hole 24a and the sound guide hole 312a of the microphone unit 14 communicate with each other through the internal space of the cylindrical member 328 and the space on the rear end opening side. .
  • the sound emitting hole 252a of the speaker unit 250 can be reliably communicated with the sound guiding hole 312a of the housing 312 by the gasket 318. And thereby, the effect similar to the said 2nd modification can be obtained.
  • the cylindrical member 328 is interposed between the sound emitting hole 252a of the speaker unit 250 and the sound collecting hole 24a of the microphone unit 14, the internal space of the cylindrical member 328 is used as the speaker.
  • the acoustic signal output from the unit 250 can function as a constituent element of a low-pass filter for making it difficult to reach the sound collection hole 24a of the microphone unit 14.
  • the rear end opening of the cylindrical member 328 is open, a space having a large capacity is formed between the microphone unit 14 and the cylindrical member 328 in the first space C1.
  • the space from the sound emission hole 252a to the sound collection hole 24a is composed of the internal space of the cylindrical member 328 and the two large capacity spaces on the front and rear sides thereof, thereby functioning as a low-pass filter. Can be increased.
  • the microphone unit 14 and the cylindrical member 328 are disposed separately, and the speaker unit 250 and the cylindrical member 328 are disposed in close contact with each other.
  • the outer diameter of the microphone can be made smaller, and the assemblability of the ear canal-mounted microphone 310 can be improved.

Abstract

Provided is a microphone to be worn in the external auditory meatus, wherein the microphone exhibits both high sensitivity in low frequency regions and a miniaturized case. An internal space (C) of a case (12) is configured as a sealed space. Furthermore, a sound acquisition hole (24a) and a vent hole (24b) are formed in a housing (24) of a microphone unit (14) contained in the case (12) and allow a front surface space (Cf) and a rear surface space (Cr) of the housing (24) to communicate with spaces outside of the housing (24). Moreover, an internal space (C) is partitioned into a first space (C1) that communicates with the front surface space (Cf) and a sound guiding hole (12a), and a second space (C2) that communicates with the rear surface space (Cr). Consequently, the rear surface space (Cr) is expanded and a large space is ensured, and the stiffness of a diaphragm (22) is reduced to allow the diaphragm (22) to vibrate more easily. Furthermore, the present invention can be achieved without increasing the size of the case (12).

Description

外耳道装着型マイクロホンEar canal wearing microphone
　本願発明は、外耳道に装着した状態で使用される外耳道装着型マイクロホンに関するものであり、特に生体音の収音に適した外耳道装着型マイクロホンに関するものである。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ear canal-mounted microphone that is used while being mounted on the ear canal, and more particularly to an ear canal-mounted microphone that is suitable for collecting body sounds.
　従来より、例えば「特許文献１」に記載されているように、心拍音等の生体音を収音するためのマイクロホンを備えた医療機器や健康管理機器が知られている。 Conventionally, as described in, for example, “Patent Document 1”, a medical device and a health care device including a microphone for collecting a body sound such as a heartbeat are known.
　「特許文献２」には、このような機器に用いられるマイクロホンとして、外耳道に装着した状態で用いられる外耳道装着型マイクロホンが記載されている。 “Patent Document 2” describes an ear canal-mounted microphone used in such a state that it is worn on the ear canal.
　この「特許文献２」に記載された外耳道装着型マイクロホンは、筐体内にマイクロホンユニットがスピーカユニットと共に収容された構成となっている。 The ear canal-mounted microphone described in “Patent Document 2” has a configuration in which a microphone unit is housed in a casing together with a speaker unit.
特開２００２－５８６５３号公報JP 2002-58653 A 特表２０１２－５０８６０５号公報Special table 2012-508605 gazette
　一般に、マイクロホンユニットは、ダイヤフラムと、このダイヤフラムの両側に正面空間と背面空間とを形成するように構成されたハウジングとを備えた構成となっている。 Generally, the microphone unit has a configuration including a diaphragm and a housing configured to form a front space and a back space on both sides of the diaphragm.
　心拍音等の生体音は低周波の音響信号として検出されるが、低周波帯域における音圧感度を高めるためには、ダイヤフラムのスティフネスをできるだけ小さくしてダイヤフラムを振動させやすくすることが望まれる。そしてそのためには、ハウジングの背面空間（すなわち収音孔が位置する正面空間とは反対側の空間）をできるだけ大きくすることが望まれる。 Physiological sounds such as heartbeats are detected as low-frequency acoustic signals, but in order to increase sound pressure sensitivity in the low-frequency band, it is desirable to make the diaphragm easy to vibrate by making the diaphragm stiffness as small as possible. For this purpose, it is desirable to make the rear space of the housing (that is, the space opposite to the front space where the sound collecting holes are located) as large as possible.
　しかしながら、ハウジングの背面空間を大きくすると、これを収容する筐体も大型化してしまうので、外耳道装着型マイクロホンとしては外耳道への装着性が悪くなってしまい、長時間の使用には適さないものとなってしまう。 However, if the rear space of the housing is increased, the housing that accommodates the housing will also increase in size, and as a result, the ear canal-equipped microphone is not easily worn on the ear canal and is not suitable for long-term use. turn into.
　本願発明は、このような事情に鑑みてなされたものであって、低周波帯域の高感度化と筐体の小型化とを両立させることができる外耳道装着型マイクロホンを提供することを目的とするものである。 The present invention has been made in view of such circumstances, and an object thereof is to provide an ear canal-equipped microphone that can achieve both high sensitivity in a low frequency band and miniaturization of a housing. Is.
　本願発明は、筐体の内部空間を密閉空間として構成した上で、マイクロホンユニットの構成に工夫を施すことにより、上記目的達成を図るようにしたものである。 In the present invention, the above-described object is achieved by devising the configuration of the microphone unit after the internal space of the housing is configured as a sealed space.
　すなわち、本願発明に係る外耳道装着型マイクロホンは、前端部に音導孔が形成された筐体と、この筐体に収容されたマイクロホンユニットと、を備えてなる外耳道装着型マイクロホンにおいて、上記筐体の内部空間が密閉空間として構成されており、上記マイクロホンユニットが、ダイヤフラムと、このダイヤフラムの両側に正面空間および背面空間を形成するように構成されたハウジングとを備えており、上記ハウジングに、上記正面空間および上記背面空間の各々を該ハウジングの外部空間に連通させる収音孔および通気孔が形成されており、上記筐体の内部空間が、上記正面空間および上記音導孔に連通する第１空間と上記背面空間に連通する第２空間とに仕切られている、ことを特徴とするものである。 That is, the ear canal wearing microphone according to the present invention is an ear canal wearing microphone including a housing having a sound guide hole formed in a front end portion thereof, and a microphone unit housed in the housing. The microphone unit includes a diaphragm and a housing configured to form a front space and a back space on both sides of the diaphragm. A sound collection hole and a vent hole are formed to communicate each of the front space and the back space with the external space of the housing, and the internal space of the housing communicates with the front space and the sound guide hole. It is partitioned into a space and a second space communicating with the back space.
　上記「外耳道装着型マイクロホン」は、筐体の前端部に装着されたイヤーチップを外耳道に挿入した状態で使用されるように構成されていてもよいし、筐体自体の前端部を外耳道に挿入した状態で使用されるように構成されていてもよい。 The above-mentioned "ear canal wearing type microphone" may be configured to be used in a state where the ear tip attached to the front end portion of the housing is inserted into the ear canal, or the front end portion of the housing itself is inserted into the ear canal. It may be configured to be used in such a state.
　上記構成において「前端部」等の方向性を示す用語は、外耳道装着型マイクロホンを構成する各部材相互間の位置関係を明確にするために便宜上用いたものであって、これにより外耳道装着型マイクロホンを実際に使用する際の方向性が限定されるものではない。 In the above configuration, the term indicating the directionality such as “front end portion” is used for the sake of convenience in order to clarify the positional relationship between members constituting the ear canal-mounted microphone. The directionality when actually using is not limited.
　上記「筐体の内部空間が密閉空間として構成されており」とは、筐体の内部空間において音導孔以外の部分が密閉空間として構成されていることを意味するものである。 The above “the internal space of the casing is configured as a sealed space” means that a portion other than the sound guide hole in the internal space of the casing is configured as a sealed space.
　上記「第１空間」と「第２空間」とを仕切るための具体的な構成は特に限定されるものではない。その際、一般にマイクロホンユニットにおいては、そのダイヤフラム等に気圧調整用の微小孔が形成された構成となっているが、このような場合において「第１空間」と「第２空間」とに「仕切られている」とは、上記微小孔以外の部分が仕切られていることを意味するものである。 The specific configuration for partitioning the “first space” and the “second space” is not particularly limited. At that time, in general, the microphone unit has a configuration in which a microscopic hole for pressure adjustment is formed in the diaphragm or the like. In such a case, the “partition” is divided into “first space” and “second space”. “It is defined” means that portions other than the micropores are partitioned.
　上記構成に示すように、本願発明に係る外耳道装着型マイクロホンは、筐体の内部空間が密閉空間として構成されており、この筐体に収容されたマイクロホンユニットのハウジングに、その正面空間および背面空間の各々を該ハウジングの外部空間に連通させる（すなわち空間的に繋げる）収音孔および通気孔が形成されており、そして、筐体の内部空間がハウジングの正面空間および音導孔に連通する第１空間とハウジングの背面空間に連通する第２空間とに仕切られているので、次のような作用効果を得ることができる。 As shown in the above configuration, in the ear canal-mounted microphone according to the present invention, the internal space of the housing is configured as a sealed space, and the front space and the back space of the microphone unit housed in the housing Sound collecting holes and vent holes are formed to communicate (i.e., spatially connect) each of the housing with the external space of the housing, and the internal space of the housing communicates with the front space and the sound guide hole of the housing. Since the first space and the second space communicating with the back space of the housing are partitioned, the following operational effects can be obtained.
　すなわち、密閉空間として構成された筐体の内部空間において、ハウジングの背面空間に連通する第２空間がハウジングの正面空間から隔離された状態で形成されることとなるので、その分だけ背面空間を拡張して大きな空間を確保することができる。したがって、ダイヤフラムのスティフネスを小さくしてこれを振動させやすくすることができ、これにより低周波帯域における音圧感度を高めることができる。しかもこれを、筐体を大型化することなく実現することができる。 That is, in the internal space of the housing configured as a sealed space, the second space communicating with the rear space of the housing is formed in a state of being isolated from the front space of the housing. It can be expanded to secure a large space. Therefore, the stiffness of the diaphragm can be reduced to make it easier to vibrate, thereby increasing the sound pressure sensitivity in the low frequency band. Moreover, this can be realized without increasing the size of the housing.
　その際、筐体の内部空間が密閉空間として構成されていることにより、マイクロホンユニットのハウジングに通気孔が形成されているにもかかわらず、生体音を収音する際に風切り音等の外部環境音の影響を受けてしまわないようにすることができる。 At that time, the internal space of the housing is configured as a sealed space, so that an external environment such as a wind noise is collected when a living body sound is collected even though a ventilation hole is formed in the housing of the microphone unit. You can avoid being affected by sound.
　このように本願発明によれば、外耳道装着型マイクロホンにおいて、低周波帯域の高感度化と筐体の小型化とを両立させることができる。 As described above, according to the present invention, in the ear canal-mounted microphone, both high sensitivity in the low frequency band and miniaturization of the housing can be achieved.
　そして、このようにして低周波帯域の高感度化を図ることにより、生体音に対する収音性能を高めることができる。また、筐体の小型化を図ることにより外耳道への装着性を高めることができ、これにより外耳道装着型マイクロホンを長時間の使用に適したものとすることができる。 Further, by improving the sensitivity in the low frequency band in this way, it is possible to improve the sound collecting performance for biological sounds. In addition, by reducing the size of the housing, it is possible to improve the ability to attach to the ear canal, thereby making it possible to make the ear canal type microphone suitable for long-time use.
　上記構成において、筐体内の前端部にガスケットが配置されるとともに、このガスケットに筐体の内部空間を音導孔に連通させる貫通孔が形成された構成とした上で、マイクロホンユニットのハウジングにその収音孔を囲むように形成された収音ノズルが取り付けられ、この収音ノズルが貫通孔に挿入された構成とすれば、次のような作用効果を得ることができる。 In the above configuration, a gasket is disposed at the front end portion in the casing, and a through hole is formed in the gasket to communicate the internal space of the casing with the sound guide hole. If the sound collecting nozzle formed so as to surround the sound collecting hole is attached and the sound collecting nozzle is inserted into the through hole, the following operational effects can be obtained.
　すなわち、ガスケットおよび収音ノズルにより、マイクロホンユニットの収音孔を筐体の音導孔に確実に連通させることができる。そしてこれにより、第１空間と第２空間との仕切りを簡易な構成により実現することができる。 That is, the sound collecting hole of the microphone unit can be reliably communicated with the sound conducting hole of the housing by the gasket and the sound collecting nozzle. Thereby, the partition between the first space and the second space can be realized with a simple configuration.
　あるいは上記構成において、筐体内の前端部にガスケットが配置されるとともに、このガスケットに筐体の内部空間を音導孔に連通させる貫通孔が形成された構成とした上で、マイクロホンユニットのハウジングにその収音孔を囲むように形成された収音ノズルが取り付けられ、この収音ノズルに前後方向に延びる筒状部材の後端部が連結され、この筒状部材の前端部が貫通孔に挿入された構成とすれば、次のような作用効果を得ることができる。 Alternatively, in the above configuration, a gasket is disposed at the front end portion in the housing, and a through hole is formed in the gasket so that the internal space of the housing communicates with the sound guide hole. A sound collecting nozzle formed so as to surround the sound collecting hole is attached, and the rear end portion of the tubular member extending in the front-rear direction is connected to the sound collecting nozzle, and the front end portion of the tubular member is inserted into the through hole. With the above-described configuration, the following operational effects can be obtained.
　すなわち、ガスケット、収音ノズルおよび筒状部材により、マイクロホンユニットの収音孔を筐体の音導孔に確実に連通させることができる。そしてこれにより、第１空間と第２空間との仕切りを比較的簡易な構成により実現することができ、かつ、マイクロホンユニットの配置自由度を高めることができる。 That is, the sound collecting hole of the microphone unit can be reliably communicated with the sound guiding hole of the casing by the gasket, the sound collecting nozzle and the cylindrical member. Thus, the partition between the first space and the second space can be realized with a relatively simple configuration, and the degree of freedom of arrangement of the microphone unit can be increased.
　これらの場合において、筐体内にスピーカユニットが配置された構成とした上で、このスピーカユニットにその放音孔を囲むように形成された放音ノズルが取り付けられた構成とする一方、ガスケットに筐体の内部空間を音導孔に連通させる第２貫通孔が上記貫通孔と間隔をおいて形成された構成とし、この第２貫通孔に放音ノズルが挿入された構成とすれば、次のような作用効果を得ることができる。 In these cases, the speaker unit is arranged in the housing, and the sound emitting nozzle formed so as to surround the sound emitting hole is attached to the speaker unit. If the second through hole that communicates the internal space of the body with the sound guide hole is formed at a distance from the through hole, and the sound emitting nozzle is inserted into the second through hole, Such effects can be obtained.
　すなわち、ガスケットおよび放音ノズルにより、スピーカユニットの放音孔を筐体の音導孔に確実に連通させることができる。したがって、筐体内にスピーカユニットが追加配置された構成とした場合においても、第１空間と第２空間とを仕切ることができる。また、このように筐体内にスピーカユニットが配置された構成とすることにより、スピーカユニットから出力される音楽等を楽しみながらあるいはこれを活用しながら生体音の収音を行うことが可能となる。 That is, the sound emitting hole of the speaker unit can be reliably communicated with the sound conducting hole of the housing by the gasket and the sound emitting nozzle. Therefore, even when the speaker unit is additionally arranged in the housing, the first space and the second space can be partitioned. Further, by adopting a configuration in which the speaker unit is arranged in the housing in this way, it is possible to collect a biological sound while enjoying or utilizing music output from the speaker unit.
　その際、筒状部材の前端部が貫通孔に挿入されるとともにその後端部が収音ノズルに連結された構成となっている場合には、この筒状部材の内部空間を、スピーカユニットから出力される音響信号をマイクロホンユニットの収音孔に到達させにくくするためのローパスフィルタの構成要素として機能させることができ、これにより生体音に対する収音性能を高めることができる。その際、筒状部材の長さおよび内径を適宜調整することによって音圧感度の微調整を行うことが容易に可能となる。 At that time, if the front end of the cylindrical member is inserted into the through-hole and the rear end is connected to the sound collecting nozzle, the internal space of the cylindrical member is output from the speaker unit. Can be made to function as a constituent element of a low-pass filter for making it difficult for the sound signal to reach the sound collection hole of the microphone unit, thereby improving the sound collection performance for biological sound. At this time, it is possible to easily finely adjust the sound pressure sensitivity by appropriately adjusting the length and the inner diameter of the cylindrical member.
本願発明の一実施形態に係る外耳道装着型マイクロホンを示す側断面図1 is a side sectional view showing an ear canal wearing microphone according to an embodiment of the present invention; 上記外耳道装着型マイクロホンにおけるマイクロホンユニットの構成を詳細に示す側断面図Side sectional view showing in detail the configuration of the microphone unit in the above-mentioned external ear canal type microphone 上記外耳道装着型マイクロホンの音圧感度特性を従来例と共に示す図The figure which shows the sound pressure sensitivity characteristic of the above-mentioned ear canal wearing type microphone with a conventional example 上記実施形態の第１変形例を示す、図１と同様の図The same figure as FIG. 1 which shows the 1st modification of the said embodiment. 上記実施形態の第２変形例を示す、図１と同様の図The same figure as FIG. 1 which shows the 2nd modification of the said embodiment. 上記実施形態の第３変形例を示す、図１と同様の図The same figure as FIG. 1 which shows the 3rd modification of the said embodiment.
　以下、図面を用いて、本願発明の実施の形態について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１は、本願発明の一実施形態に係る外耳道装着型マイクロホン１０を示す側断面図である。 FIG. 1 is a side sectional view showing an ear canal-mounted microphone 10 according to an embodiment of the present invention.
　同図に示すように、本実施形態に係る外耳道装着型マイクロホン１０は、前端部（図１において右端部）に音導孔１２ａが形成された筐体１２と、この筐体１２に収容されたマイクロホンユニット１４と、筐体１２の前端部に装着されたイヤーチップ１６とを備えた構成となっている。 As shown in the figure, the ear canal-mounted microphone 10 according to the present embodiment is housed in a housing 12 having a sound guide hole 12a formed in a front end portion (right end portion in FIG. 1), and the housing 12. The microphone unit 14 and an ear tip 16 attached to the front end of the housing 12 are provided.
　この外耳道装着型マイクロホン１０は、そのイヤーチップ１６を外耳道に装着した状態で、心拍音や脈拍音等の生体音を収音するために用いられるようになっている。 The ear canal-mounted microphone 10 is used to collect a body sound such as a heartbeat or a pulse sound while the ear tip 16 is mounted on the ear canal.
　筐体１２は、前方部材１２Ａと後方部材１２Ｂとが接合された構成となっている。これら前方部材１２Ａおよび後方部材１２Ｂは、いずれもアルミニウムや硬質樹脂等の硬質材料で構成されている。 The housing 12 has a configuration in which a front member 12A and a rear member 12B are joined. The front member 12A and the rear member 12B are both made of a hard material such as aluminum or hard resin.
　前方部材１２Ａは、前方へ向けて径が小さくなるように形成されており、その前端壁１２Ａａの中央部には、前方へ突出する小径円筒部１２Ａｂが形成されている。上記音導孔１２ａは、この小径円筒部１２Ａｂに形成されており、また、上記イヤーチップ１６は、この小径円筒部１２Ａｂに装着されている。 The front member 12A is formed so that the diameter decreases toward the front, and a small-diameter cylindrical portion 12Ab protruding forward is formed at the center of the front end wall 12Aa. The sound guide hole 12a is formed in the small diameter cylindrical portion 12Ab, and the ear tip 16 is attached to the small diameter cylindrical portion 12Ab.
　この前方部材１２Ａの後端面１２Ａｃは、円環状に形成されている。また、この前方部材１２Ａの内周面１２Ａｄは、後方へ向けて２段階で径が大きくなる円筒面で構成されている。 The rear end surface 12Ac of the front member 12A is formed in an annular shape. Further, the inner peripheral surface 12Ad of the front member 12A is configured by a cylindrical surface whose diameter increases in two steps toward the rear.
　後方部材１２Ｂは、前後方向に延びる有底円筒状の部材として構成されており、その後端部が後端壁１２Ｂｂとして構成されている。この後方部材１２Ｂの前端面１２Ｂａは、前方部材１２Ａの後端面１２Ａｃの外周縁部に当接した状態で、溶着や接着等によって全周にわたってシールされている。 The rear member 12B is configured as a bottomed cylindrical member extending in the front-rear direction, and the rear end portion is configured as a rear end wall 12Bb. The front end surface 12Ba of the rear member 12B is sealed over the entire periphery by welding, adhesion, or the like in a state where the front end surface 12Ba is in contact with the outer peripheral edge portion of the rear end surface 12Ac of the front member 12A.
　これにより、筐体１２の内部空間Ｃは、音導孔１２ａの部分を除いて密閉された空間として構成されている。 Thereby, the internal space C of the housing 12 is configured as a sealed space except for the sound guide hole 12a.
　筐体１２の内部空間Ｃの前端部には、円筒状の外周面を有するガスケット１８が配置されている。このガスケット１８は、シリコーン樹脂やラバー等の軟質材料で構成されている。そして、このガスケット１８は、その外周面を前方部材１２Ａの内周面１２Ａｄの小径部に後方側から嵌め込むようにした状態で、その前端面が前方部材１２Ａの前端壁１２Ａａに当接する位置まで挿入されている。 A gasket 18 having a cylindrical outer peripheral surface is disposed at the front end of the internal space C of the housing 12. The gasket 18 is made of a soft material such as silicone resin or rubber. The gasket 18 is in a state in which the outer peripheral surface thereof is fitted into the small diameter portion of the inner peripheral surface 12Ad of the front member 12A from the rear side until the front end surface contacts the front end wall 12Aa of the front member 12A. Has been inserted.
　このガスケット１８は、前半部が円筒状に形成されるとともに後半部が円柱状に形成されており、その後半部の中央には円形の断面形状で前後方向に延びる貫通孔１８ａが形成されている。そして、この貫通孔１８ａにより、筐体１２の内部空間Ｃを音導孔１２ａに連通させるようになっている。 This gasket 18 has a front half formed in a cylindrical shape and a rear half formed in a columnar shape, and a through-hole 18a extending in the front-rear direction with a circular cross-sectional shape is formed in the center of the latter half. . The through space 18a allows the internal space C of the housing 12 to communicate with the sound guide hole 12a.
　マイクロホンユニット１４は、ダイヤフラム２２と、このダイヤフラム２２の前後両側に正面空間Ｃｆおよび背面空間Ｃｒを形成するように構成されたハウジング２４とを備えている。ハウジング２４には、正面空間Ｃｆおよび背面空間Ｃｒの各々を該ハウジング２４の外部空間に連通させる収音孔２４ａおよび通気孔２４ｂが形成されている。また、このハウジング２４には、収音孔２４ａを囲むように形成された収音ノズル２６が溶接等によって取り付けられている。 The microphone unit 14 includes a diaphragm 22 and a housing 24 configured to form a front space Cf and a back space Cr on both front and rear sides of the diaphragm 22. The housing 24 is formed with a sound collection hole 24 a and a vent hole 24 b that allow the front space Cf and the back space Cr to communicate with the external space of the housing 24. A sound collecting nozzle 26 formed so as to surround the sound collecting hole 24a is attached to the housing 24 by welding or the like.
　マイクロホンユニット１４は、前後方向と直交する鉛直面に沿って配置されており、その収音ノズル２６の先端部がガスケット１８の貫通孔１８ａに後方側から挿入された状態で位置決めされている。 The microphone unit 14 is disposed along a vertical plane orthogonal to the front-rear direction, and is positioned in a state where the tip of the sound collection nozzle 26 is inserted into the through hole 18a of the gasket 18 from the rear side.
　そしてこれにより、筐体１２の内部空間Ｃを、正面空間Ｃｆおよび音導孔１２ａに連通する第１空間Ｃ１と背面空間Ｃｒに連通する第２空間Ｃ２とに仕切るようになっている。 Thus, the internal space C of the housing 12 is divided into a first space C1 communicating with the front space Cf and the sound guide hole 12a and a second space C2 communicating with the back space Cr.
　なお、マイクロホンユニット１４の位置決めに関しては、収音ノズル２６の先端部をガスケット１８の貫通孔１８ａに挿入することのみによって行うようにしてもよいし、ハウジング２４と前方部材１２Ａの内周面１２Ａｄの大径部との間にスペーサ（図示せず）を配置して周方向の複数箇所において支持する構造等を追加して行うようにしてもよい。 The positioning of the microphone unit 14 may be performed only by inserting the tip of the sound collecting nozzle 26 into the through hole 18a of the gasket 18, or the housing 24 and the inner peripheral surface 12Ad of the front member 12A. A spacer (not shown) may be disposed between the large-diameter portion and a structure that supports a plurality of locations in the circumferential direction may be added.
　イヤーチップ１６は、シリコーンゴム等の軟質材料で構成されている。 The eartip 16 is made of a soft material such as silicone rubber.
　このイヤーチップ１６の中心部には、該イヤーチップ１６を前後方向に貫通する貫通孔１６ａが形成されている。この貫通孔１６ａは、イヤーチップ１６が小径円筒部１２Ａｂに装着された状態で音導孔１２ａに連通するようになっている。この貫通孔１６ａは、音導孔１２ａよりも小さい径で形成されている。 At the center of the ear tip 16, a through hole 16a that penetrates the ear tip 16 in the front-rear direction is formed. The through hole 16a communicates with the sound guide hole 12a in a state where the ear tip 16 is attached to the small diameter cylindrical portion 12Ab. The through hole 16a is formed with a smaller diameter than the sound guide hole 12a.
　このイヤーチップ１６は、後方側へ向けて略パラボラ状に広がる前後２つのフランジ部１６Ａ、１６Ｂを備えている。その際、前方側のフランジ部１６Ａよりも後方側のフランジ部１６Ｂの方が大きい径で形成されている。これによりイヤーチップ１６を外耳道に装着したとき、前後２つのフランジ部１６Ａ、１６Ｂが外耳道の壁面に密着して、外耳道内に外耳道壁と鼓膜とイヤーチップ１６とによって密閉された空間を形成するようになっている。 The eartip 16 includes two front and rear flange portions 16A and 16B that spread in a substantially parabolic shape toward the rear side. At that time, the flange portion 16B on the rear side is formed with a larger diameter than the flange portion 16A on the front side. Thus, when the ear tip 16 is attached to the ear canal, the two front and rear flange portions 16A and 16B are brought into close contact with the wall surface of the ear canal to form a sealed space in the ear canal by the ear canal wall, the eardrum and the ear tip 16. It has become.
　この密閉された外耳道内には心拍や脈拍等による外耳道壁および鼓膜の振動が心拍音や脈拍音等として放射されるが、外耳道装着型マイクロホン１０においては、これら心拍音や脈拍音等を生体音としてマイクロホンユニット１４で収音するようになっている。 In the sealed external auditory canal, vibrations of the ear canal wall and the eardrum caused by heartbeat and pulse are radiated as heartbeat and pulse sound. The microphone unit 14 collects sound.
　図２は、マイクロホンユニット１４の構成を詳細に示す側断面図である。 FIG. 2 is a side sectional view showing the configuration of the microphone unit 14 in detail.
　同図に示すように、マイクロホンユニット１４は、小型のエレクトレットコンデンサマイクロホンであって、正面視においてφ５～１０ｍｍ程度の円形の外形形状を有するとともに１～３ｍｍ程度の厚みを有している。 As shown in the figure, the microphone unit 14 is a small electret condenser microphone having a circular outer shape of about φ5 to 10 mm and a thickness of about 1 to 3 mm when viewed from the front.
　このマイクロホンユニット１４においては、ダイヤフラム２２が、支持リング３２、背面電極板３４、スペーサ３６、導通部材３８、絶縁部材４０およびインピーダンス変換素子４２と共に、ハウジング２４に収容された構成となっている。 In the microphone unit 14, the diaphragm 22 is housed in the housing 24 together with the support ring 32, the back electrode plate 34, the spacer 36, the conducting member 38, the insulating member 40, and the impedance conversion element 42.
　ハウジング２４は、導電性カバー４４と回路基板４６とによって構成されている。 The housing 24 includes a conductive cover 44 and a circuit board 46.
　導電性カバー４４は、正面視において円形の外形形状を有するキャップ状の部材であって、金属板にプレス加工を施すことにより形成されている。一方、回路基板４６は、正面視において導電性カバー４４の内径よりもやや小さい外径の円形形状を有しており、導電性カバー４４の前面壁と平行に配置されている。導電性カバー４４における周面壁の後端部には、内周側へ折れ曲がるようにして延びる環状折曲部４４ａが延長形成されており、この環状折曲部４４ａにおいて回路基板４６にカシメ固定されている。 The conductive cover 44 is a cap-like member having a circular outer shape when viewed from the front, and is formed by pressing a metal plate. On the other hand, the circuit board 46 has a circular shape with an outer diameter slightly smaller than the inner diameter of the conductive cover 44 in a front view, and is arranged in parallel with the front wall of the conductive cover 44. An annular bent portion 44a extending so as to bend to the inner peripheral side is extended at the rear end portion of the peripheral wall of the conductive cover 44. The annular bent portion 44a is caulked and fixed to the circuit board 46. Yes.
　ハウジング２４の収音孔２４ａは、導電性カバー４４における前面壁の中央部に形成されている。また、ハウジング２４の通気孔２４ｂは、回路基板４６に形成されている。これら収音孔２４ａおよび通気孔２４ｂは、いずれも円形形状を有しており、通気孔２４ｂの方が収音孔２４ａよりも小さい径で形成されている。なお、これら収音孔２４ａおよび通気孔２４ｂは、それぞれ複数の小孔で形成された構成とすることも可能である。 The sound collecting hole 24 a of the housing 24 is formed at the center of the front wall of the conductive cover 44. Further, the air holes 24 b of the housing 24 are formed in the circuit board 46. Both of the sound collection holes 24a and the air holes 24b have a circular shape, and the air holes 24b are formed with a diameter smaller than that of the sound collection holes 24a. The sound collecting holes 24a and the air holes 24b may be configured by a plurality of small holes, respectively.
　収音ノズル２６の先端部には、円形の開口部２６ａが形成されている。 A circular opening 26 a is formed at the tip of the sound collection nozzle 26.
　ダイヤフラム２２は、高分子フィルムの前面に金属蒸着膜が形成された構成となっており、その中心部には気圧調整用の微小孔２２ａが形成されている。このダイヤフラム２２は、その外周縁部において支持リング３２に支持されている。この支持リング３２は、金属製の薄板で構成されており、円環状に形成されている。ダイヤフラム２２は、この支持リング３２の後面に張設固定（すなわちテンションをかけた状態で接着等により固定）されている。 The diaphragm 22 has a structure in which a metal vapor deposition film is formed on the front surface of the polymer film, and a micro hole 22a for adjusting the atmospheric pressure is formed at the center thereof. The diaphragm 22 is supported by the support ring 32 at the outer peripheral edge portion thereof. The support ring 32 is made of a thin metal plate and is formed in an annular shape. The diaphragm 22 is stretched and fixed to the rear surface of the support ring 32 (that is, fixed by adhesion or the like in a tensioned state).
　背面電極板３４は、正面視において、支持リング３２の外周面よりもひと回り小さい円形の外形形状を有しており、ダイヤフラム２２の後方に近接して配置されている。この背面電極板３４は、金属板で構成された電極板本体の前面にエレクトレット層３４ａが配置された構成となっている。このエレクトレット層３４ａは、電極板本体の前面に形成された絶縁膜に所定のチャージ電圧で分極処理を施すことによって生成されており、これにより所定の表面電位が付与されている。この背面電極板３４には、その周方向の複数箇所に、該背面電極板３４を前後方向に貫通する貫通孔３４ｂが形成されている。 The back electrode plate 34 has a circular outer shape that is slightly smaller than the outer peripheral surface of the support ring 32 when viewed from the front, and is disposed close to the rear of the diaphragm 22. The back electrode plate 34 has a configuration in which an electret layer 34a is disposed on the front surface of an electrode plate body made of a metal plate. The electret layer 34a is generated by subjecting an insulating film formed on the front surface of the electrode plate body to a polarization treatment with a predetermined charge voltage, thereby applying a predetermined surface potential. The back electrode plate 34 is formed with through holes 34b penetrating the back electrode plate 34 in the front-rear direction at a plurality of locations in the circumferential direction.
　スペーサ３６は、円環状に形成された樹脂製の薄板で構成されており、ダイヤフラム２２と背面電極板３４との間に配置されている。そして、このスペーサ３６を介してダイヤフラム２２と背面電極板３４のエレクトレット層３４ａとが平行に対向配置されることにより、コンデンサ部が構成されるようになっている。 The spacer 36 is formed of a thin resin plate formed in an annular shape, and is disposed between the diaphragm 22 and the back electrode plate 34. The diaphragm 22 and the electret layer 34a of the back electrode plate 34 are arranged opposite to each other in parallel via the spacer 36, so that a capacitor portion is configured.
　回路基板４６は、背面電極板３４の後方に配置されている。この回路基板４６の前後両面には、図示しない導電層がそれぞれ所定のパターンで形成されている。この回路基板４６の後面には、マイクロホンユニット１４を信号処理回路（図示せず）に電気的に接続するための１対の端子部１４ａが形成されている。 The circuit board 46 is disposed behind the back electrode plate 34. Conductive layers (not shown) are formed in a predetermined pattern on both front and rear surfaces of the circuit board 46. On the rear surface of the circuit board 46, a pair of terminal portions 14a for electrically connecting the microphone unit 14 to a signal processing circuit (not shown) is formed.
　なお、上記信号処理回路は、筐体１２の内部空間Ｃに送受信機等と共に配置された構成としてもよいし、筐体１２から外部に引き出されたケーブル（図示せず）を介して１対の端子部１４ａと電気的に接続された構成としてもよい。 The signal processing circuit may be arranged in the internal space C of the housing 12 together with a transceiver or the like, or a pair of cables (not shown) drawn from the housing 12 to the outside. It is good also as a structure electrically connected with the terminal part 14a.
　インピーダンス変換素子４２は、回路基板４６の前面に搭載されている。その際、このインピーダンス変換素子４２は、通気孔２４ｂの形成位置から外れた位置に配置されている。 The impedance conversion element 42 is mounted on the front surface of the circuit board 46. At this time, the impedance conversion element 42 is disposed at a position away from the formation position of the vent hole 24b.
　導通部材３８は、略円筒状の部材であって、回路基板４６と背面電極板３４との間に配置された状態で、両者間の導通を図るようになっている。 The conducting member 38 is a substantially cylindrical member, and is arranged between the circuit board 46 and the back electrode plate 34 so as to conduct between them.
　絶縁部材４０は、環状の部材であって、背面電極板３４および導通部材３８と導電性カバー４４の周面壁との間に配置された状態で、両者間の絶縁を図るようになっている。 The insulating member 40 is an annular member and is arranged between the back electrode plate 34 and the conductive member 38 and the peripheral wall of the conductive cover 44 to insulate them.
　上述したように、導電性カバー４４は、その環状折曲部４４ａにおいて回路基板４６にカシメ固定されているが、このカシメ固定により、導電性カバー４４と回路基板４６の後面に形成された導電層との導通を図るようになっている。 As described above, the conductive cover 44 is caulked and fixed to the circuit board 46 at the annular bent portion 44 a, and the conductive layer formed on the rear surfaces of the conductive cover 44 and the circuit board 46 by the caulking is fixed. It is designed to be connected to.
　図３は、外耳道装着型マイクロホン１０の音圧感度特性を従来例と共に示す図である。 FIG. 3 is a diagram showing a sound pressure sensitivity characteristic of the ear canal-mounted microphone 10 together with a conventional example.
　同図において実線で示すグラフＡは、外耳道装着型マイクロホン１０の音圧感度特性を示すグラフである。 A graph A indicated by a solid line in the figure is a graph showing a sound pressure sensitivity characteristic of the ear canal-mounted microphone 10.
　一方、同図において破線で示すグラフＢは、外耳道装着型マイクロホン１０において、仮に、そのマイクロホンユニット１４のハウジング２４に通気孔２４ｂが形成されていなかったとした場合（すなわち従来の一般的なマイクロホンユニットが配置されているとした場合）の音圧感度特性を示すグラフである。 On the other hand, a graph B indicated by a broken line in FIG. 5 indicates that the vent hole 24b is not formed in the housing 24 of the microphone unit 14 in the ear canal-mounted microphone 10 (that is, a conventional general microphone unit is not used). It is a graph which shows the sound pressure sensitivity characteristic of the case where it arrange | positions.
　２つのグラフＡ、Ｂの比較から明らかなように、マイクロホンユニット１４のハウジング２４に通気孔２４ｂを形成した場合には、これを形成しなかった場合に比して、１～３Ｈｚ程度の心拍数の帯域を含む１０Ｈｚ以下の低周波帯域における感度レベルが１０ｄＢ近く上昇している。これは、通気孔２４ｂの形成により、ダイヤフラム２２の背面空間Ｃｒがこれに連通する第２空間Ｃ２のサイズまで拡大したためと考えられる。すなわち、背面空間Ｃｒの拡大によって背面空間Ｃｒの弾性が弱まってダイヤフラム２２のスティフネスが小さくなり、振動しやすくなったことによるものと考えられる。 As is clear from the comparison between the two graphs A and B, when the vent hole 24b is formed in the housing 24 of the microphone unit 14, the heart rate is about 1 to 3 Hz compared to the case where the vent hole 24b is not formed. The sensitivity level in a low frequency band of 10 Hz or less including the above band is increased by nearly 10 dB. This is presumably because the back space Cr of the diaphragm 22 has expanded to the size of the second space C2 communicating with the rear space Cr due to the formation of the air holes 24b. In other words, it is considered that the expansion of the back space Cr weakens the elasticity of the back space Cr and the stiffness of the diaphragm 22 is reduced, which makes it easier to vibrate.
　次に本実施形態の作用効果について説明する。 Next, the function and effect of this embodiment will be described.
　本実施形態に係る外耳道装着型マイクロホン１０は、筐体１２の内部空間Ｃが密閉空間として構成されており、この筐体１２に収容されたマイクロホンユニット１４のハウジング２４に、その正面空間Ｃｆおよび背面空間Ｃｒの各々を該ハウジング２４の外部空間に連通させる収音孔２４ａおよび通気孔２４ｂが形成されており、そして、筐体１２の内部空間Ｃがハウジング２４の正面空間Ｃｆおよび音導孔１２ａに連通する第１空間Ｃ１とハウジング２４の背面空間Ｃｒに連通する第２空間Ｃ２とに仕切られているので、次のような作用効果を得ることができる。 In the ear canal-mounted microphone 10 according to this embodiment, the internal space C of the housing 12 is configured as a sealed space, and the front space Cf and the back surface of the microphone unit 14 housed in the housing 12 are provided in the housing 24. Sound collecting holes 24a and vent holes 24b for communicating each of the spaces Cr with the outer space of the housing 24 are formed, and the inner space C of the housing 12 is formed in the front space Cf and the sound guiding hole 12a of the housing 24. Since the first space C1 that communicates with the second space C2 that communicates with the back space Cr of the housing 24 is partitioned, the following operational effects can be obtained.
　すなわち、密閉空間として構成された筐体１２の内部空間Ｃにおいて、ハウジング２４の背面空間Ｃｒに連通する第２空間Ｃ２がハウジング２４の正面空間Ｃｆから隔離された状態で形成されることとなるので、その分だけ背面空間Ｃｒを拡張して大きな空間を確保することができる。したがって、ダイヤフラム２２のスティフネスを小さくしてこれを振動させやすくすることができ、これにより低周波帯域における音圧感度を高めることができる。しかもこれを、筐体１２を大型化することなく実現することができる。 That is, in the internal space C of the housing 12 configured as a sealed space, the second space C2 communicating with the back space Cr of the housing 24 is formed in a state of being isolated from the front space Cf of the housing 24. Thus, the back space Cr can be expanded by that much to secure a large space. Therefore, the stiffness of the diaphragm 22 can be reduced to make it easier to vibrate, thereby increasing the sound pressure sensitivity in the low frequency band. Moreover, this can be realized without increasing the size of the housing 12.
　その際、筐体１２の内部空間Ｃが密閉空間として構成されていることにより、マイクロホンユニット１４のハウジング２４に通気孔２４ｂが形成されているにもかかわらず、生体音を収音する際に風切り音等の外部環境音の影響を受けてしまわないようにすることができる。 At this time, since the internal space C of the housing 12 is configured as a sealed space, the airflow is cut when the body sound is collected even though the ventilation hole 24b is formed in the housing 24 of the microphone unit 14. It can be prevented from being affected by external environmental sounds such as sound.
　このように本実施形態によれば、外耳道装着型マイクロホン１０において、低周波帯域の高感度化と筐体１２の小型化とを両立させることができる。 Thus, according to the present embodiment, in the ear canal-mounted microphone 10, both high sensitivity in the low frequency band and miniaturization of the housing 12 can be achieved.
　そして、このようにして低周波帯域の高感度化を図ることにより、生体音に対する収音性能を高めることができる。また、筐体１２の小型化を図ることにより外耳道への装着性を高めることができ、これにより外耳道装着型マイクロホン１０を長時間の使用に適したものとすることができる。 Further, by improving the sensitivity in the low frequency band in this way, it is possible to improve the sound collecting performance for biological sounds. In addition, by reducing the size of the housing 12, it is possible to improve the ability to attach to the ear canal, thereby making it possible to make the ear canal-mounted microphone 10 suitable for long-time use.
　その際、本実施形態においては、筐体１２内の前端部にガスケット１８が配置されるとともに、このガスケット１８に筐体１２の内部空間Ｃを音導孔１２ａに連通させる貫通孔１８ａが形成されており、その上で、マイクロホンユニット１４のハウジング２４に、その収音孔２４ａを囲むように形成された収音ノズル２６が取り付けられており、この収音ノズル２６が貫通孔１８ａに挿入されているので、次のような作用効果を得ることができる。 At this time, in the present embodiment, a gasket 18 is disposed at the front end portion in the housing 12, and a through hole 18 a for communicating the internal space C of the housing 12 with the sound guide hole 12 a is formed in the gasket 18. Further, a sound collecting nozzle 26 formed so as to surround the sound collecting hole 24a is attached to the housing 24 of the microphone unit 14, and the sound collecting nozzle 26 is inserted into the through hole 18a. Therefore, the following effects can be obtained.
　すなわち、ガスケット１８および収音ノズル２６により、マイクロホンユニット１４の収音孔２４ａを筐体１２の音導孔１２ａに確実に連通させることができる。そしてこれにより、第１空間Ｃ１と第２空間Ｃ２との仕切りを簡易な構成により実現することができる。 That is, the sound collection hole 24 a of the microphone unit 14 can be reliably communicated with the sound guide hole 12 a of the housing 12 by the gasket 18 and the sound collection nozzle 26. Thereby, the partition between the first space C1 and the second space C2 can be realized with a simple configuration.
　上記実施形態においては、マイクロホンユニット１４が前後方向と直交する鉛直面に沿って配置されているものとして説明したが、前後方向と直交する鉛直面に対して傾斜した平面に沿って配置された構成とすることも可能である。 In the above embodiment, the microphone unit 14 has been described as being disposed along a vertical plane orthogonal to the front-rear direction. However, the microphone unit 14 is disposed along a plane inclined with respect to the vertical plane orthogonal to the front-rear direction. It is also possible.
　上記実施形態においては、マイクロホンユニット１４がエレクトレットコンデンサマイクロホンである場合について説明したが、これ以外のマイクロホン（例えばダイヤフラムの背面空間に通気孔が形成された動電型マイクロホン）を採用することも可能である。 In the above embodiment, the case where the microphone unit 14 is an electret condenser microphone has been described. However, it is also possible to employ a microphone other than this (for example, an electrodynamic microphone in which a vent hole is formed in the back space of the diaphragm). is there.
　次に、上記実施形態の変形例について説明する。 Next, a modification of the above embodiment will be described.
　まず、上記実施形態の第１変形例について説明する。 First, a first modification of the above embodiment will be described.
　図４は、本変形例に係る外耳道装着型マイクロホン１１０を示す、図１と同様の図である。 FIG. 4 is a view similar to FIG. 1, showing the ear canal-mounted microphone 110 according to this modification.
　同図に示すように、この外耳道装着型マイクロホン１１０の基本的な構成は上記実施形態の場合と同様であるが、筐体１２の内部空間Ｃに筒状部材１２８が追加配置されている点で上記実施形態の場合と異なっている。 As shown in the figure, the basic configuration of the ear canal-mounted microphone 110 is the same as that of the above embodiment, except that a cylindrical member 128 is additionally arranged in the internal space C of the housing 12. This is different from the above embodiment.
　すなわち本変形例においては、マイクロホンユニット１４のハウジング２４に取り付けられた収音ノズル２６に、前後方向に延びる筒状部材１２８の後端部が連結されるとともに、この筒状部材１２８の前端部がガスケット１８の貫通孔１８ａに挿入された構成となっている。この筒状部材１２８は、アルミニウムや硬質樹脂等の硬質材料で構成されていてもよいし、シリコーン樹脂やラバー等の軟質材料で構成されていてもよい。 That is, in this modification, the rear end portion of the cylindrical member 128 extending in the front-rear direction is connected to the sound collection nozzle 26 attached to the housing 24 of the microphone unit 14, and the front end portion of the cylindrical member 128 is The gasket 18 is inserted into the through hole 18 a of the gasket 18. The cylindrical member 128 may be made of a hard material such as aluminum or hard resin, or may be made of a soft material such as silicone resin or rubber.
　収音ノズル２６と筒状部材１２８との連結は、収音ノズル２６の先端部を筒状部材１２８の後端部に挿入することによって行われている。 The connection between the sound collection nozzle 26 and the cylindrical member 128 is performed by inserting the front end portion of the sound collection nozzle 26 into the rear end portion of the cylindrical member 128.
　本変形例の構成を採用した場合には、ガスケット１８、収音ノズル２６および筒状部材１２８により、マイクロホンユニット１４の収音孔２４ａを筐体１２の音導孔１２ａに確実に連通させることができる。そしてこれにより、第１空間Ｃ１と第２空間Ｃ２との仕切りを比較的簡易な構成により実現することができる。また、マイクロホンユニット１４の配置自由度を高めることができる。 When the configuration of this modification is employed, the sound collecting hole 24a of the microphone unit 14 can be reliably communicated with the sound conducting hole 12a of the housing 12 by the gasket 18, the sound collecting nozzle 26, and the cylindrical member 128. it can. As a result, the partition between the first space C1 and the second space C2 can be realized with a relatively simple configuration. Further, the degree of freedom of arrangement of the microphone unit 14 can be increased.
　次に、上記実施形態の第２変形例について説明する。 Next, a second modification of the above embodiment will be described.
　図５は、本変形例に係る外耳道装着型マイクロホン２１０を示す、図１と同様の図である。 FIG. 5 is a view similar to FIG. 1, showing the ear canal-mounted microphone 210 according to this modification.
　同図に示すように、この外耳道装着型マイクロホン２１０の基本的な構成は上記第１変形例の場合と同様であるが、筐体１２の内部空間Ｃにスピーカユニット２５０が追加配置されている点で上記第１変形例の場合と異なっている。また、これに伴って、ガスケット２１８の構成が上記第１変形例の場合と異なっている。 As shown in the figure, the basic configuration of the ear canal-mounted microphone 210 is the same as that of the first modified example, except that a speaker unit 250 is additionally arranged in the internal space C of the housing 12. This is different from the case of the first modification. Accordingly, the configuration of the gasket 218 is different from that in the first modification.
　すなわち本変形例においては、ガスケット２１８に、筐体１２の内部空間Ｃを音導孔１２ａに連通させる第２貫通孔２１８ｂが貫通孔２１８ａと間隔をおいて形成されている。その際、貫通孔２１８ａは、ガスケット２１８の中央部から下方に変位した位置に形成されており、第２貫通孔２１８ｂは貫通孔２１８ａの上方側に形成されている。 That is, in the present modification, the gasket 218 is formed with a second through hole 218b that communicates the internal space C of the housing 12 with the sound guide hole 12a at a distance from the through hole 218a. At that time, the through hole 218a is formed at a position displaced downward from the center of the gasket 218, and the second through hole 218b is formed above the through hole 218a.
　本変形例においても、マイクロホンユニット１４に関しては、上記第１変形例と同様、そのハウジング２４に取り付けられた収音ノズル２６に、前後方向に延びる筒状部材１２８の後端部が連結されるとともに、この筒状部材１２８の前端部がガスケット２１８の貫通孔２１８ａに挿入された構成となっている。 Also in this modified example, with respect to the microphone unit 14, the rear end portion of the tubular member 128 extending in the front-rear direction is connected to the sound collecting nozzle 26 attached to the housing 24, as in the first modified example. The front end portion of the cylindrical member 128 is inserted into the through hole 218a of the gasket 218.
　スピーカユニット２５０は、バランスドアーマチャ型スピーカであって、ハウジング２５２内に図示しないダイヤフラムおよび駆動ユニットが収容された構成となっている。 The speaker unit 250 is a balanced armature type speaker, and has a structure in which a diaphragm and a drive unit (not shown) are accommodated in a housing 252.
　ハウジング２５２は、前後方向に長い略直方体の外形形状を有しており、その前端面の下端部には放音孔２５２ａが形成されている。そして、このハウジング２５２の前端部には、放音孔２５２ａを囲むように形成された放音ノズル２５４が溶接等によって取り付けられている。また、このハウジング２５２の後部には、スピーカユニット２５０をその駆動制御回路（図示せず）に電気的に接続するための１対の端子部２５０ａが配置されている。 The housing 252 has a substantially rectangular parallelepiped outer shape that is long in the front-rear direction, and a sound emitting hole 252a is formed at the lower end portion of the front end surface thereof. A sound emitting nozzle 254 formed so as to surround the sound emitting hole 252a is attached to the front end portion of the housing 252 by welding or the like. In addition, a pair of terminal portions 250a for electrically connecting the speaker unit 250 to a drive control circuit (not shown) is disposed at the rear portion of the housing 252.
　スピーカユニット２５０は、その放音ノズル２５４の先端部をガスケット２１８の第２貫通孔２１８ｂに後方側から挿入した状態で位置決めされている。そして、このスピーカユニット２５０においては、上記駆動制御回路からの信号電流に応じた音波を発生させ、この音波を放音孔２５２ａおよび第２貫通孔２１８ｂを介して音導孔１２ａへ放射するようになっている。 The speaker unit 250 is positioned in a state in which the tip portion of the sound emitting nozzle 254 is inserted into the second through hole 218b of the gasket 218 from the rear side. The speaker unit 250 generates a sound wave corresponding to the signal current from the drive control circuit, and radiates the sound wave to the sound guide hole 12a through the sound output hole 252a and the second through hole 218b. It has become.
　このスピーカユニット２５０の位置決めに関しては、放音ノズル２５４の先端部をガスケット２１８の第２貫通孔２１８ｂに挿入することのみによって行うようにしてもよいし、ハウジング２５２と後方部材１２Ｂの内周面との間にスペーサ（図示せず）を配置して周方向の複数箇所において支持する構造等を追加して行うようにしてもよい。 The positioning of the speaker unit 250 may be performed only by inserting the tip of the sound emitting nozzle 254 into the second through hole 218b of the gasket 218, or the housing 252 and the inner peripheral surface of the rear member 12B. Alternatively, a spacer (not shown) may be disposed between them to support a plurality of locations in the circumferential direction.
　本変形例の構成を採用した場合には、ガスケット２１８および放音ノズル２５４により、スピーカユニット２５０の放音孔２５２ａを筐体１２の音導孔１２ａに確実に連通させることができる。したがって、筐体１２の内部空間Ｃにスピーカユニット２５０が追加配置されているにもかかわらず、第１空間Ｃ１と第２空間Ｃ２とを仕切ることができる。また、このように筐体１２の内部空間Ｃにスピーカユニット２５０が配置された構成とすることにより、スピーカユニット２５０から出力される音楽等を楽しみながらあるいはこれを活用しながら生体音の収音を行うことが可能となる。 When the configuration of this modification is employed, the sound emission hole 252a of the speaker unit 250 can be reliably communicated with the sound guide hole 12a of the housing 12 by the gasket 218 and the sound emission nozzle 254. Therefore, although the speaker unit 250 is additionally arranged in the internal space C of the housing 12, the first space C1 and the second space C2 can be partitioned. In addition, by adopting a configuration in which the speaker unit 250 is arranged in the internal space C of the housing 12 as described above, it is possible to collect biological sounds while enjoying or utilizing music output from the speaker unit 250. Can be done.
　その際、本変形例のように、筒状部材１２８の前端部が貫通孔２１８ａに挿入されるとともにその後端部が収音ノズル２６に連結された構成とすることにより、この筒状部材１２８の内部空間を、スピーカユニット２５０から出力される音響信号をマイクロホンユニット１４の収音孔２４ａに到達させにくくするためのローパスフィルタの構成要素として機能させることができ、これにより生体音に対する収音性能を高めることができる。その際、筒状部材１２８の長さおよび内径を適宜調整することによって音圧感度の微調整を行うことが容易に可能となる。 At this time, as in this modification, the front end portion of the cylindrical member 128 is inserted into the through hole 218a and the rear end portion thereof is connected to the sound collecting nozzle 26. The internal space can be made to function as a component of a low-pass filter for making it difficult for an acoustic signal output from the speaker unit 250 to reach the sound collection hole 24a of the microphone unit 14, thereby improving sound collection performance with respect to biological sound. Can be increased. At this time, it is possible to easily finely adjust the sound pressure sensitivity by appropriately adjusting the length and the inner diameter of the cylindrical member 128.
　さらに、筒状部材１２８が配置されていることにより、マイクロホンユニット１４をスピーカユニット２５０よりも後方側に配置することができる。したがって、正面視においてマイクロホンユニット１４とスピーカユニット２５０とを重複させた状態で配置することができ、これにより筐体１２の外径が大きくなってしまうのを未然に防止することができる。 Furthermore, since the cylindrical member 128 is arranged, the microphone unit 14 can be arranged behind the speaker unit 250. Therefore, the microphone unit 14 and the speaker unit 250 can be arranged in an overlapped state when viewed from the front, which can prevent the outer diameter of the housing 12 from increasing.
　上記第２変形例においては、スピーカユニット２５０がバランスドアーマチャ型スピーカである場合について説明したが、これ以外のスピーカ（例えば動電型スピーカ）を採用することも可能である。 In the second modification, the case where the speaker unit 250 is a balanced armature type speaker has been described. However, other speakers (for example, electrodynamic type speakers) may be employed.
　次に、上記実施形態の第３変形例について説明する。 Next, a third modification of the above embodiment will be described.
　図６は、本変形例に係る外耳道装着型マイクロホン３１０を示す、図１と同様の図である。 FIG. 6 is a view similar to FIG. 1, showing the ear canal-mounted microphone 310 according to this modification.
　同図に示すように、この外耳道装着型マイクロホン３１０の基本的な構成は上記第２変形例の場合と同様であるが、筐体３１２の形状ならびにマイクロホンユニット１４およびスピーカユニット２５０の配置が上記第２変形例の場合と異なっている。また本変形例においては、上記第２変形例のように、マイクロホンユニット１４に収音ノズル２６が取り付けられてはおらず、スピーカユニット２５０に放音ノズル２５４が取り付けられてはいない。これに伴って、ガスケット３１８および筒状部材３２８の構成が上記第２変形例の場合と異なっている。 As shown in the figure, the basic configuration of the ear canal-mounted microphone 310 is the same as that of the second modification, but the shape of the housing 312 and the arrangement of the microphone unit 14 and the speaker unit 250 are the same as those of the second modification. This is different from the second modification. In this modification, the sound collection nozzle 26 is not attached to the microphone unit 14 and the sound emission nozzle 254 is not attached to the speaker unit 250 as in the second modification. In connection with this, the structure of the gasket 318 and the cylindrical member 328 differs from the case of the said 2nd modification.
　すなわち、本変形例の筐体３１２は、上記第２変形例の筐体１２よりも小さい外径で形成されている。 That is, the housing 312 of the present modification is formed with an outer diameter smaller than that of the housing 12 of the second modification.
　筐体３１２は、前方部材３１２Ａと後方部材３１２Ｂとが接合された構成となっている。 The housing 312 has a configuration in which a front member 312A and a rear member 312B are joined.
　後方部材３１２Ｂは、上記第２変形例の後方部材１２Ｂを縮小させたような形状を有している。すなわち、この後方部材３１２Ｂは、前後方向に延びる有底円筒状の部材として構成されており、その後端部が後端壁３１２Ｂｂとして構成されている。 The rear member 312B has such a shape that the rear member 12B of the second modified example is reduced. That is, the rear member 312B is configured as a bottomed cylindrical member extending in the front-rear direction, and the rear end portion is configured as the rear end wall 312Bb.
　前方部材３１２Ａは、後方部材３１２Ｂと同一径で円筒状に形成されており、その前端壁３１２Ａａの中央部には、上記第２変形例の小径円筒部１２Ａｂと同様の小径円筒部３１２Ａｂが形成されている。 The front member 312A is formed in a cylindrical shape with the same diameter as the rear member 312B, and a small-diameter cylindrical portion 312Ab similar to the small-diameter cylindrical portion 12Ab of the second modified example is formed in the center portion of the front end wall 312Aa. ing.
　そして、筐体３１２は、前方部材３１２Ａの後端面３１２Ａｃと後方部材３１２Ｂの前端面３１２Ｂａとを当接させた状態で、溶着や接着等によって全周にわたってシールされている。これにより、筐体３１２の内部空間Ｃは、音導孔３１２ａの部分を除いて密閉された空間として構成されている。 And the housing | casing 312 is sealed over the perimeter by welding, adhesion | attachment, etc. in the state which contact | abutted rear end surface 312Ac of front member 312A, and front-end surface 312Ba of back member 312B. Thus, the internal space C of the housing 312 is configured as a sealed space except for the portion of the sound guide hole 312a.
　前方部材３１２Ａは、その周面壁の後端部がやや厚肉で形成されており、その内径はマイクロホンユニット１４の外径よりも僅かに大きい値に設定されている。マイクロホンユニット１４は、そのハウジング２４の外周面において前方部材３１２Ａの周面壁の後端部にシール材３６０を介して固定されている。そしてこれにより、筐体３１２の内部空間Ｃを、正面空間Ｃｆおよび音導孔３１２ａに連通する第１空間Ｃ１と背面空間Ｃｒに連通する第２空間Ｃ２とに仕切るようになっている。 The front member 312 </ b> A has a slightly thicker rear end on its peripheral wall, and its inner diameter is set to be slightly larger than the outer diameter of the microphone unit 14. The microphone unit 14 is fixed to the rear end portion of the peripheral wall of the front member 312 </ b> A via the seal member 360 on the outer peripheral surface of the housing 24. As a result, the internal space C of the housing 312 is partitioned into a first space C1 communicating with the front space Cf and the sound guide hole 312a and a second space C2 communicating with the back space Cr.
　ガスケット３１８は、その後半部が円筒状に形成されるとともに前半部が円柱状に形成されており、その前半部には前後方向に延びる貫通孔３１８ａが形成されている。この貫通孔３１８ａは、ガスケット３１８の中央部からその下方側に延びるようにして形成されている。そして、この貫通孔３１８ａにより、筐体３１２の内部空間Ｃを音導孔３１２ａに連通させるようになっている。 The gasket 318 has a second half formed in a cylindrical shape and a first half formed in a columnar shape, and a through hole 318a extending in the front-rear direction is formed in the first half. The through hole 318a is formed so as to extend downward from the center of the gasket 318. The through hole 318a allows the internal space C of the housing 312 to communicate with the sound guide hole 312a.
　本変形例のスピーカユニット２５０は、その放音孔２５２ａをガスケット３１８の貫通孔３１８ａへ向けるようにしてガスケット３１８に当接した状態で配置されている。 The speaker unit 250 of this modification is disposed in a state where the sound emitting hole 252a is in contact with the gasket 318 so that the sound emitting hole 252a faces the through hole 318a of the gasket 318.
　また、本変形例の筒状部材３２８は、スピーカユニット２５０の下面に密着した状態で前後方向に延びており、その前端開口をガスケット３１８の貫通孔３１８ａへ向けるようにしてガスケット３１８に当接した状態で配置されている。この筒状部材３２８は、上記第２変形例の筒状部材１２８よりも短尺に形成されている。 Further, the tubular member 328 of the present modification extends in the front-rear direction while being in close contact with the lower surface of the speaker unit 250, and abuts against the gasket 318 so that the front end opening thereof faces the through hole 318a of the gasket 318. Arranged in a state. The tubular member 328 is formed to be shorter than the tubular member 128 of the second modified example.
　これにより本変形例においては、マイクロホンユニット１４の収音孔２４ａと音導孔３１２ａとの連通が、筒状部材３２８の内部空間およびその後端開口側の空間を介して行われるようになっている。 Thereby, in this modification, the sound collection hole 24a and the sound guide hole 312a of the microphone unit 14 communicate with each other through the internal space of the cylindrical member 328 and the space on the rear end opening side. .
　本変形例の構成を採用した場合においても、ガスケット３１８により、スピーカユニット２５０の放音孔２５２ａを筐体３１２の音導孔３１２ａに確実に連通させることができる。そしてこれにより、上記第２変形例と同様の作用効果を得ることができる。 Even when the configuration of this modification is employed, the sound emitting hole 252a of the speaker unit 250 can be reliably communicated with the sound guiding hole 312a of the housing 312 by the gasket 318. And thereby, the effect similar to the said 2nd modification can be obtained.
　また本変形例においても、スピーカユニット２５０の放音孔２５２ａとマイクロホンユニット１４の収音孔２４ａとの間に筒状部材３２８が介在しているので、この筒状部材３２８の内部空間を、スピーカユニット２５０から出力される音響信号をマイクロホンユニット１４の収音孔２４ａに到達させにくくするためのローパスフィルタの構成要素として機能させることができる。しかも、この筒状部材３２８の後端開口は開放されているので、第１空間Ｃ１におけるマイクロホンユニット１４と筒状部材３２８との間に容量の大きい空間が形成されることとなる。したがって、放音孔２５２ａから収音孔２４ａまでの空間は、筒状部材３２８の内部空間とその前後両側の２つの容量の大きい空間とで構成されることとなり、これによりローパスフィルタとしての機能を高めることができる。その際、本変形例においても、筒状部材３２８の長さおよび内径とその後端開口側の空間の大きさとを適宜調整することによって音圧感度の微調整を行うことが容易に可能となる。 Also in this modified example, since the cylindrical member 328 is interposed between the sound emitting hole 252a of the speaker unit 250 and the sound collecting hole 24a of the microphone unit 14, the internal space of the cylindrical member 328 is used as the speaker. The acoustic signal output from the unit 250 can function as a constituent element of a low-pass filter for making it difficult to reach the sound collection hole 24a of the microphone unit 14. In addition, since the rear end opening of the cylindrical member 328 is open, a space having a large capacity is formed between the microphone unit 14 and the cylindrical member 328 in the first space C1. Therefore, the space from the sound emission hole 252a to the sound collection hole 24a is composed of the internal space of the cylindrical member 328 and the two large capacity spaces on the front and rear sides thereof, thereby functioning as a low-pass filter. Can be increased. At this time, also in the present modification, it is possible to easily finely adjust the sound pressure sensitivity by appropriately adjusting the length and inner diameter of the cylindrical member 328 and the size of the space on the rear end opening side.
　さらに本変形例においては、マイクロホンユニット１４と筒状部材３２８とが分離して配置されており、かつ、スピーカユニット２５０と筒状部材３２８とが密着した状態で配置されているので、筐体１２の外径をより小さくすることができ、かつ、外耳道装着型マイクロホン３１０の組立性を向上させることができる。 Further, in the present modification, the microphone unit 14 and the cylindrical member 328 are disposed separately, and the speaker unit 250 and the cylindrical member 328 are disposed in close contact with each other. The outer diameter of the microphone can be made smaller, and the assemblability of the ear canal-mounted microphone 310 can be improved.
　なお、上記実施形態およびその変形例において諸元として示した数値は一例にすぎず、これらを適宜異なる値に設定してもよいことはもちろんである。 It should be noted that the numerical values shown as specifications in the above-described embodiment and its modifications are merely examples, and it goes without saying that these may be set to different values as appropriate.
　また、本願発明は、上記実施形態およびその変形例に記載された構成に限定されるものではなく、これ以外の種々の変更を加えた構成が採用可能である。 Further, the present invention is not limited to the configurations described in the above embodiment and its modifications, and configurations with various other changes can be adopted.
　１０、１１０、２１０、３１０　外耳道装着型マイクロホン
　１２、３１２　筐体
　１２ａ、３１２ａ　音導孔
　１２Ａ、３１２Ａ　前方部材
　１２Ａａ、３１２Ａａ　前端壁
　１２Ａｂ、３１２Ａｂ　小径円筒部
　１２Ａｃ、３１２Ａｃ　後端面
　１２Ａｄ　内周面
　１２Ｂ、３１２Ｂ　後方部材
　１２Ｂａ、３１２Ｂａ　前端面
　１２Ｂｂ、３１２Ｂｂ　後端壁
　１４　マイクロホンユニット
　１４ａ、２５０ａ　端子部
　１６　イヤーチップ
　１６ａ、１８ａ、３４ｂ、２１８ａ、３１８ａ　貫通孔
　１６Ａ、１６Ｂ　フランジ部
　１８、２１８、３１８　ガスケット
　２２　ダイヤフラム
　２２ａ　微小孔
　２４、２５２　ハウジング
　２４ａ　収音孔
　２４ｂ　通気孔
　２６　収音ノズル
　２６ａ　開口部
　３２　支持リング
　３４　背面電極板
　３４ａ　エレクトレット層
　３６　スペーサ
　３８　導通部材
　４０　絶縁部材
　４２　インピーダンス変換素子
　４４　導電性カバー
　４４ａ　環状折曲部
　４６　回路基板
　１２８、３２８　筒状部材
　２１８ｂ　第２貫通孔
　２５０　スピーカユニット
　２５２ａ　放音孔
　２５４　放音ノズル
　３６０　シール材
　Ｃ　内部空間
　Ｃｆ　正面空間
　Ｃｒ　背面空間
　Ｃ１　第１空間
　Ｃ２　第２空間 10, 110, 210, 310 External auditory canal-equipped microphone 12, 312 Housing 12a, 312a Sound conducting hole 12A, 312A Front member 12Aa, 312Aa Front end wall 12Ab, 312Ab Small diameter cylindrical portion 12Ac, 312Ac Rear end surface 12Ad Inner peripheral surface 12B, 312B Rear member 12Ba, 312Ba Front end surface 12Bb, 312Bb Rear end wall 14 Microphone unit 14a, 250a Terminal portion 16 Ear tip 16a, 18a, 34b, 218a, 318a Through hole 16A, 16B Flange portion 18, 218, 318 Gasket 22 Diaphragm 22a Small Hole 24, 252 Housing 24a Sound collecting hole 24b Vent hole 26 Sound collecting nozzle 26a Opening portion 32 Support ring 34 Back electrode plate 34a Electret layer 36 Spacer 38 Conducting member 40 Insulating member 42 Impedance conversion element 44 Conductive cover 44a Circular bent portion 46 Circuit board 128, 328 Cylindrical member 218b Second through hole 250 Speaker unit 252a Sound emitting hole 254 Sound emitting nozzle 360 Sealing material C Internal space Cf Front space Cr Back space C1 1st space C2 2nd space

Claims (4)

  1. 　前端部に音導孔が形成された筐体と、この筐体に収容されたマイクロホンユニットと、を備えてなる外耳道装着型マイクロホンにおいて、
    　上記筐体の内部空間が密閉空間として構成されており、
    　上記マイクロホンユニットが、ダイヤフラムと、このダイヤフラムの両側に正面空間および背面空間を形成するように構成されたハウジングとを備えており、
    　上記ハウジングに、上記正面空間および上記背面空間の各々を該ハウジングの外部空間に連通させる収音孔および通気孔が形成されており、
    　上記筐体の内部空間が、上記正面空間および上記音導孔に連通する第１空間と上記背面空間に連通する第２空間とに仕切られている、ことを特徴とする外耳道装着型マイクロホン。     In an ear-canal-equipped microphone comprising a housing in which a sound guide hole is formed at the front end, and a microphone unit accommodated in the housing,
    The internal space of the housing is configured as a sealed space,
    The microphone unit includes a diaphragm and a housing configured to form a front space and a back space on both sides of the diaphragm,
    The housing is formed with a sound collection hole and a vent hole for communicating each of the front space and the back space with an external space of the housing,
    An external ear canal-equipped microphone, wherein an internal space of the housing is partitioned into a first space communicating with the front space and the sound guide hole and a second space communicating with the back space.
  2. 　上記筐体内の前端部にガスケットが配置されており、
    　このガスケットに、上記筐体の内部空間を上記音導孔に連通させる貫通孔が形成されており、
    　上記ハウジングに、上記収音孔を囲むように形成された収音ノズルが取り付けられており、
    　この収音ノズルが上記貫通孔に挿入されている、ことを特徴とする請求項１記載の外耳道装着型マイクロホン。     A gasket is arranged at the front end in the housing,
    In this gasket, a through hole is formed for communicating the internal space of the housing with the sound guide hole,
    A sound collecting nozzle formed to surround the sound collecting hole is attached to the housing,
    2. The ear canal-equipped microphone according to claim 1, wherein the sound collection nozzle is inserted into the through hole.
  3. 　上記筐体内の前端部にガスケットが配置されており、
    　このガスケットに、上記筐体の内部空間を上記音導孔に連通させる貫通孔が形成されており、
    　上記ハウジングに、上記収音孔を囲むように形成された収音ノズルが取り付けられており、
    　この収音ノズルに、前後方向に延びる筒状部材の後端部が連結されており、
    　この筒状部材の前端部が上記貫通孔に挿入されている、ことを特徴とする請求項１記載の外耳道装着型マイクロホン。     A gasket is arranged at the front end in the housing,
    In this gasket, a through hole is formed for communicating the internal space of the housing with the sound guide hole,
    A sound collecting nozzle formed to surround the sound collecting hole is attached to the housing,
    The rear end portion of the cylindrical member extending in the front-rear direction is connected to the sound collection nozzle,
    The ear canal-mounted microphone according to claim 1, wherein a front end portion of the cylindrical member is inserted into the through hole.
  4. 　上記筐体内にスピーカユニットが配置されており、
    　このスピーカユニットに、該スピーカユニットの放音孔を囲むように形成された放音ノズルが取り付けられており、
    　上記ガスケットに、上記筐体の内部空間を上記音導孔に連通させる第２貫通孔が、上記貫通孔と間隔をおいて形成されており、
    　この第２貫通孔に上記放音ノズルが挿入されている、ことを特徴とする請求項２または３記載の外耳道装着型マイクロホン。     A speaker unit is arranged in the housing,
    A sound emission nozzle formed so as to surround the sound emission hole of the speaker unit is attached to the speaker unit,
    A second through hole that communicates the internal space of the housing with the sound guide hole is formed in the gasket at a distance from the through hole.
    4. The ear canal-equipped microphone according to claim 2, wherein the sound emitting nozzle is inserted into the second through hole.
PCT/JP2015/072814 2014-12-17 2015-08-12 Microphone to be worn in external auditory meatus WO2016098381A1 (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60180200U (en) * 1984-05-10 1985-11-29 ソニー株式会社 hearing aid
JPH0469998U (en) * 1990-10-29 1992-06-22
JPH05199577A (en) * 1991-03-19 1993-08-06 Temuko Japan:Kk Ear microphone
JP2002186075A (en) * 2000-12-18 2002-06-28 Goro Yamauchi Waterproof electroacoustic transducer
WO2005094118A1 (en) * 2004-03-25 2005-10-06 Nap Enterprise Co., Ltd. Oscillation echo canceller system
WO2008139931A1 (en) * 2007-05-09 2008-11-20 Nap Enterprise Co., Ltd. Earphone microphone
JP2010273108A (en) * 2009-05-21 2010-12-02 Hosiden Corp Head set
JP2014068835A (en) * 2012-09-28 2014-04-21 Bifristec Kk Subject information detection device, subject information processing device, subject information detection method, and device for detecting subject information

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60180200U (en) * 1984-05-10 1985-11-29 ソニー株式会社 hearing aid
JPH0469998U (en) * 1990-10-29 1992-06-22
JPH05199577A (en) * 1991-03-19 1993-08-06 Temuko Japan:Kk Ear microphone
JP2002186075A (en) * 2000-12-18 2002-06-28 Goro Yamauchi Waterproof electroacoustic transducer
WO2005094118A1 (en) * 2004-03-25 2005-10-06 Nap Enterprise Co., Ltd. Oscillation echo canceller system
WO2008139931A1 (en) * 2007-05-09 2008-11-20 Nap Enterprise Co., Ltd. Earphone microphone
JP2010273108A (en) * 2009-05-21 2010-12-02 Hosiden Corp Head set
JP2014068835A (en) * 2012-09-28 2014-04-21 Bifristec Kk Subject information detection device, subject information processing device, subject information detection method, and device for detecting subject information

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