JP2019121895A - Acoustic device - Google Patents

Abstract

The present invention provides an acoustic device having good middle-to-low bass reproducibility.
An earphone (10) has a driver unit (12) and an ear plug (15). The earplug 15 holds the driver unit 12 toward the ear canal 110. The driver unit 12 is covered by a cap 13. The ear plug 15 is in close contact with the cap 13 covering the driver unit 12 and the inner wall 110 a of the ear canal 110. The earplug 15 covers the sound emitting portion 12 a of the driver unit 12. The driver unit 12 has high sound insulation to relatively high frequency sounds as compared to relatively low frequency sounds. The driver unit 12 is a low resilience foam or a low resilience rubber.
[Selected figure] Figure 8

Description

  The present invention relates to an acoustic device worn on the ear and used.

A large number of earphones have been commercialized as acoustic devices to be worn on the ear and used.
The earphones are roughly classified into inner ear type earphones (also called intraconca type earphones, open air type earphones, etc.) and canal type earphones (also called earplug types, closed type, etc.).

  As shown in FIG. 20, the inner-ear type earphone 50 is used by fitting the housing 52 containing the driver unit 51 into a hollow portion (a concha cavity) 113 surrounded by the tragus 114 and the antitragus 115 .

  As shown in FIG. 21, the canal type earphone 60 includes a housing 62 incorporating a driver unit 61, a sound conduit 63 projecting from the housing 62, and an earpiece 64 mounted around the sound conduit 63. . The canal type earphone 60 is used by inserting the earpiece 64 into the ear canal 110.

Unexamined-Japanese-Patent No. 2010-232982

  Earphones have to adopt a driver unit with a relatively small diameter. For this reason, middle-low tone reproducibility is not good as compared with so-called headphones and the like. In order to improve middle-bass reproducibility, it is necessary to improve the tightness of the ear canal. Then, it is necessary to improve the vibration transmission efficiency between the inner wall of the ear canal and the driver unit.

  The inner ear type earphone 50 can adopt a driver unit having a large diameter as compared with the canal type earphone 60. For this reason, the inner ear type earphone 50 has good middle-to-low bass reproducibility if attention is focused only on the performance of the driver unit. However, since the inner ear type earphone 50 does not seal the ear canal, it is difficult to take advantage of the performance of the driver unit. In addition, since the inner-ear type earphone 50 does not contact the ear canal, the vibration transmission efficiency between the inner wall of the ear canal and the driver unit 51 is extremely low, and the mid-bass reproducibility is not good.

  The canal type earphone 60 seals the ear canal 110 with the earpiece 64. For this reason, the canal type earphone 60 is considered to be able to obtain good bass reproducibility while adopting a driver unit with a relatively small diameter. However, since the canal type earphone 60 has a structure for guiding the sound emitted from the sound emitting portion 61 a of the driver unit 61 through the sound conduit 63 into the ear canal, the mid-low bass reproducibility is not good.

  The earpiece 64 of the canal type earphone 60 protrudes outward from the cylindrical base 64a and one end of the base 64a (side facing the back of the ear canal) and is thin so as to cover the base 64a toward the other end. And the formed umbrella-like to dome-like flange 64b. For this reason, a space C is formed between the inner wall 110a of the ear canal 110 and the base 64a. Due to the presence of the space C, the canal type earphone 60 considerably reduces the vibration transmission efficiency between the inner wall 110 a of the ear canal 110 and the driver unit 61. This is also a factor that degrades the mid-bass reproducibility of the canal type earphone 60.

  The problem to be solved by the present invention is to provide an acoustic device having good middle-bass reproducibility.

The acoustic devices of the present invention include the following acoustic devices.
Configuration 1:
Acoustic device comprising a driver unit and a carrier.
The holder holds the driver unit toward the ear canal.
The holder closely contacts the side wall of the driver unit and the inner wall of the ear canal.
The holder is a vibration transmitting material.
The vibration transfer material fills in between the side wall of the driver unit and the inner wall of the ear canal.

Configuration 2:
The holder covers the sound emitting portion of the driver unit.

Configuration 3:
The carrier has a cavity in communication with the sound release part of the driver unit.

Configuration 4:
The holding body has high sound insulation to relatively high frequency sounds as compared to relatively low frequency sounds.

Configuration 5:
The holding body accommodates the entire driver unit.

Configuration 6:
The holder has an insertion portion which is inserted into the ear canal.
The insertion portion accommodates all or part of the driver unit.

Configuration 7:
The holder is
An insertion portion inserted into the ear canal and an outer portion disposed outside the ear canal.
The insertion portion is inserted into the ear canal.
The outer portion is disposed outside the ear canal.
The outer side accommodates all or part of the driver unit.

Configuration 8:
The acoustic device of an embodiment of the present invention has a cap that covers the driver unit.
The holding body accommodates the driver unit together with the cap.

Configuration 9:
The acoustic device according to an embodiment of the present invention further includes a housing that accommodates all or part of the driver unit.
The holding body accommodates the whole or a part of the container.

Configuration 10:
The support has elasticity and flexibility.

Configuration 11:
The support is a low resilience foam or a low resilience rubber.

Side view of acoustic device (for left ear) according to the first embodiment Side view of the acoustic device (for the right ear) according to the first embodiment Partial cross-sectional view of the acoustic device shown in FIG. Partial side view of the acoustic device shown in FIG. 2 excluding the holding body Perspective view of the holder The perspective view which looked the holding body from another direction Cross section of support A schematic sectional view showing a state in which the acoustic device shown in FIG. 2 is worn on the ear Sectional view of a holder according to a second embodiment Sectional view of a holder according to a third embodiment Cross-sectional view of an acoustic device according to a fourth embodiment A schematic cross-sectional view showing a state in which the acoustic device shown in FIG. 11 is worn on the ear Cross-sectional view of an acoustic device according to a fifth embodiment Cross-sectional view of an acoustic device according to a sixth embodiment The perspective view of the acoustic device concerning a 7th embodiment A schematic sectional view showing a state in which the acoustic device shown in FIG. 15 is worn on the ear The schematic cross section which shows the state which attached the acoustic device to the ear in the eighth embodiment The schematic cross section which shows the state which attached the sound device to the ear in a 9th embodiment The schematic cross section which shows the state which mounted | wore the ear with the acoustic device in 10th Embodiment Figure showing the earbud earphones worn on the ear Figure showing the canal-type earphone attached to the ear

First Embodiment
The acoustic device 10 (10L, 10R) shown in FIGS. 1 and 2 is an acoustic device (hereinafter referred to as an earphone) used by being attached to the ear 100 (FIG. 8). The left ear earphone 10L shown in FIG. 1 and the right ear earphone 10R shown in FIG. 2 are usually used in pairs. It is also possible to use one of the left and right ear earphones 10L and 10R alone. The structures of the two earphones 10L and 10R are substantially the same. Hereinafter, the earphone 10R for the right ear will be described.

  As shown in FIG. 3, the earphone 10R has a main body 11, a driver unit 12, a cap 13, a holder (hereinafter referred to as "ear plug") 15, and a cord (cable) 16. .

  As shown in FIG. 3 and FIG. 4, the main body 11 includes a grip portion 11 a, a cylinder portion 11 b, a locking portion 11 c, and a cord lead portion 11 d.

  The main body 11 is formed of a synthetic resin.

  The holding portion 11 a is a portion to be held with a finger when attaching and detaching the earphone 10 to the ear.

  The cylinder part 11b protrudes from the holding part 11a. The tube portion 11 b is a portion disposed facing the ear canal 110 (FIG. 8) when the earphone 10 is attached to the ear 100. The axial direction of the tube portion 11 b is the insertion / removal direction A of the earphone 10 into the external ear canal 110.

  The locking portion 11c is a flange-like portion provided on the cylindrical portion 11b. The locking portion 11c protrudes radially outward from the outer peripheral surface of the cylindrical portion 11b. The locking portion 11c is inclined toward the holding portion 11a. The surface 11s of the locking portion 11c on the side disposed facing the external ear canal 110 is a partial conical surface.

  The cord drawing portion 11d protrudes from the holding portion 11a. The cord extraction portion 11 d is a portion disposed between the tragus 114 of the pinna and the anti-tragus 115 when the earphone 10 is attached to the ear.

  The driver unit 12 performs sound emission (sound reproduction) based on the input electrical signal. The driver unit 12 is fixed to the cylindrical portion 11 b. The shape of the driver unit 12 is cylindrical. The driver unit 12 is disposed coaxially with the cylindrical portion 11b.

  The cap 13 is made of metal. The cap 13 covers the driver unit 12. The cap 13 protects the driver unit 12. The cap 13 is fixed to the cylindrical portion 11 b of the main body 11. The cap 13 has an end plate portion 13 a covering the sound emitting portion 12 a of the driver unit 12 and a cylindrical portion 13 b covering the side surface 12 b of the driver unit 12. The end plate portion 13a is provided with a plurality of through holes through which the sound from the sound emitting portion 12a passes. The cylindrical portion 13 b is in contact with or in proximity to the side surface 12 b of the driver unit 12.

  The cord 16 transmits an electrical signal from a reproduction device (not shown) to the driver unit 12. One end of the cord 16 is connected to the signal terminal of the driver unit 12. The other end side of the cord 16 extends to the outside of the main body 11 from the end of the cord drawing portion 11 d.

  As shown in FIGS. 5 to 7, the earplug 15 has a two-step dome shape, that is, a shape in which a small diameter dome is superimposed on the outside of a large diameter dome. The earplug 15 is non-penetrating. That is, the earplug 15 does not have a hole penetrating it.

  The earplug 15 has a storage chamber (cavity) 15a. The storage chamber 15a is open at the end 15b on the maximum diameter side. The shape of the storage chamber 15a is cylindrical. The storage chamber 15a extends halfway from the end 15b on the maximum diameter side of the earplug 15 toward the end 15c on the minimum diameter side. The diameter dimension of the storage chamber 15c is slightly smaller than the diameter dimensions of the cap 13 and the locking portion 11b. These shapes and sizes are shapes and sizes in a state in which the ear plug 15 is not deformed.

  As shown in FIG. 3, the ear plug 15 accommodates the entire driver unit 12 in the accommodation chamber 15 a. The ear plug 15 is accommodated from the cap 13 to the cylindrical portion 11 b of the main body 11 in the accommodation chamber 15 a. The storage chamber 15a is deformed following the shapes of the cap 13, the locking portion 11c and the cylindrical portion 11b. The innermost surface 15 d (FIG. 7) of the storage chamber 15 a contacts the end plate portion 13 a. The inner circumferential surface 15e (FIG. 7) of the storage chamber 15a is in contact with the cylindrical portion 13b, the locking portion 11c and the cylindrical portion 11b.

  The ear plug 15 is locked to the locking portion 11 c by the inner peripheral surface in the vicinity of the opening of the storage chamber 15 a deforming along the locking portion 11 c. Thereby, detachment of the earplug 15 from the main body 11 is prevented. Further, due to the pressure contact force (frictional force) between the inner peripheral surface 15 e of the storage chamber 15 a and the cylindrical portion 13 b of the cap 13, detachment of the earplug 15 from the main body 11 is prevented.

  The ear plug 15 can be replaced by peeling it off from the cap 13 and the cylindrical portion 11 b.

  As shown in FIG. 8, most of the earplug 15 is inserted into the ear canal 110. That is, most of the earplug 15 is composed of the insertion portion 17 (FIG. 7). The earplug 15 holds the driver unit 12 toward the back of the ear canal 110 via the cap 13 and the main body 11. The ear plug 15 is in close contact with at least the cylindrical portion 13 b of the cap 13. The earplug 15 is in close contact with the inner wall 110 a of the ear canal 110.

  The earplug 15 is a vibration transmitting material made of a viscoelastic foam. As an example of the material of the earplug 15, low resilience polyurethane can be mentioned. The earplug 15 deforms when compressed. When the ear plug 15 is not compressed, it slowly returns to its original shape.

  The earplug 15 fills the space between the cap 13 and the inner wall 110 a of the ear canal 110. Between the driver unit 12 and the inner wall 110 a of the ear canal 110, a cap 13 and an earplug 15 are connected so as to transmit vibration.

  The earplug 15 is a transmission medium of the sound emitted from the driver unit 12. Part of the sound emitted from the driver unit 12 passes through the earplug 15. The earplug 15 partially absorbs the energy of the sound emitted from the driver unit 12. Part of the absorbed energy is vibrational energy with the earplug 15 as a medium.

  A part of the sound emitted from the sound emitting unit 12 a of the driver unit 12 is emitted (discharged as air vibration) into the space on the back side (tympanic membrane side) of the ear canal 110 via the earplug 15. A part of the sound emitted from the sound emitting unit 12 a of the driver unit 12 is transmitted to the inner wall 110 a of the ear canal 110 along the ear plug 15. The sound (vibration) transmitted to the inner wall 110 a of the ear canal 110 includes solid vibration with the ear plug 15 as a visco-elastic body as a medium. Part of the vibration of the driver unit 12 is transmitted to the inner wall 110 a of the ear canal 110 via the cap 13 and the earplug 15.

  The earplug 15 has sound insulation. The earplug 15 has a relatively high sound insulation to relatively high frequency sounds.

  As described above, the earphone 10 emits the sound from the sound emitting unit 12 a of the driver unit 12 into the ear canal 110 without passing through the sound conduit 63 (FIG. 21). In addition, the earphone 10 connects the driver unit 12 and the inner wall 110 a of the ear canal 110 via the cap 13 and the ear plug 15 so as to transmit vibration. Therefore, the earphone 10 has better middle-to-low bass reproducibility than the canal-type earphone 60 shown in FIG.

  Further, the earphone 10 is provided with a non-penetrating earplug 15. For this reason, the earphone 10 has high bass reproducibility compared with the one provided with the penetration type ear plug. This is because the earplug 15 has a property of high sound insulation (sound absorption) with respect to relatively high frequency sound. That is, the sound emitted from the sound emitting unit 12 a of the driver unit 12 is amplified relative to the high frequency component relative to the high frequency component through the ear plug 15.

  Further, since the earphone 10 transmits the vibration of the driver unit 12 (including the sound from the sound emitting unit 12 a and the vibration of the driver unit 12 itself) to the inner wall 12 a of the ear canal 110 via the ear plug 15, the driver unit 12. The reproduced sound can be transmitted to the auditory organ (ears bone, cochlea, etc.) not only by the vibration of air but also by the vibration of skin and bone. This works extremely well for the audibility of the playback sound.

  Further, the earphone 10 is suitable for combined use with a microphone (pickup device) because the entire driver unit 12 is covered with the ear plug 15 made of visco-elastic foam. That is, generation of howling can be prevented when the sound picked up by the microphone is reproduced by the earphone 10. This is because the earplug 15 made of visco-elastic foam has an effect of attenuating the sound of the peak frequency (the frequency that triggers howling) included in the sound from the driver unit 12. In addition, the non-penetrating earplug 15 has a better howling prevention performance as compared to the penetrating type.

Second Embodiment
The earplug 151 shown in FIG. 9 has a cavity 151 a communicating with the sound emitting portion 12 a of the driver unit 12. The cavity 151a extends from the accommodation chamber 15a to the vicinity of the end 15c on the minimum diameter side. The back of the cavity 151a is dome-shaped. The earphone 151 is a non-penetrating type. The earplug 151 is more likely to transmit the sound emitted from the sound emitting portion 12 a of the driver unit 12 as compared with the earplug 15 having the structure of FIG. 7. For this reason, the earphone provided with the ear plug 151 of the structure of FIG. 9 is superior to the earphone 10 provided with the ear plug 15 of the structure of FIG. Further, the earphone provided with the ear plug 151 of the structure of FIG. 9 is superior in high-pitched sound reproducibility to the earphone 10 provided with the ear plug 15 of the structure of FIG. In addition, howling prevention performance of both is equivalent in the state with which it mounted | worn with ear 100. FIG.

Third Embodiment
The earplug 152 shown in FIG. 10 has a through hole 152a that communicates with the storage chamber 15a and the end 15c on the minimum diameter side. As compared with the earplug 15 having the structure of FIG. 7, the earplug 152 can easily transmit the sound emitted from the sound emitting portion 12 a of the driver unit 12. That is, part of the sound (air vibration) emitted from the sound emitting portion 12a of the driver unit 12 is emitted (discharged as air vibration) into the space on the back side (tympanic membrane side) of the ear canal 110 through the through hole 152a. obtain. For this reason, while the earphone provided with the ear plug 152 of the structure of FIG. 10 is not good in bass reproducibility as compared with the earphone 10 equipped with the ear plug 15 of the structure of FIG. is there. In order to further improve high-pitched sound reproducibility, the diameter dimension of the through hole 152a is preferably larger. In order to improve middle-low tone reproducibility, the diameter dimension of the through hole 152a is preferably smaller. In order to further improve middle-low tone reproducibility, the diameter of the through hole 152a is preferably 1 mm or less in the non-compressed state.

  In the state of being attached to the ear 100, the through hole 152a may be closed. However, as long as the entire space of the through hole 152a does not disappear, the presence of the through hole 152a can contribute to the improvement of the high-pitched sound reproducibility.

Fourth Embodiment
The earphone 20 shown in FIGS. 11 and 12 has a sound unit 21 and an earplug 23.

  The acoustic unit 21 has a driver unit 12 and a housing 22.

The housing 22 accommodates the entire driver unit 12.
The housing 22 has a substrate 221 and a cover 222.

  The substrate 221 has a disk shape. The protrusion 221 a is provided on one side of the substrate 221. The protrusions 221 a are provided along the periphery of the substrate 221. The protrusion 221 a protrudes concentrically from one surface of the substrate 221. The driver unit 12 is fixed to the protrusion 221 a.

  The cover 222 has a side wall 222a and an end plate 222b. The side wall 222a and the end plate 222b are integrally molded. The side wall 222a is cylindrical. The outer diameter of the side wall 222 a is approximately equal to the outer diameter of the substrate 221. The end plate 222 b has a disk shape. The end plate 222 b closes one end side of the side wall 222 a. The end plate 222 b is provided with a plurality of through holes. The other end of the side wall 222 a is fixed to the substrate 221. The fixing method of the side wall 222a and the substrate 221 is arbitrary. As an example of a method of fixing the side wall 222a and the substrate 221, adhesion can be mentioned.

  The sound emitting portion 12a of the driver unit 12 is in proximity to or in contact with the end plate 222b. The side surface 12b of the driver unit 12 is in proximity to or in contact with the side wall 222a.

  A through hole 222c penetrating in the axial direction is provided at the central portion of the end plate 222b. The cord 16 is inserted into the through hole 222c. One end of the cord 16 is connected to the signal terminal of the driver unit 12. The other end of the cord 16 extends from the end plate 222 b to the outside of the acoustic unit 21.

  The earplug 23 is spherical. The earplug 23 has a storage chamber 23 a for storing the acoustic unit 21. The earplug 23 has a notch. The earplug 23 can mount the acoustic unit 21 in the storage chamber 23a through the cut. The cord 16 is pulled out of the earplug 23 through the notch.

  As shown in FIG. 12, approximately half of the earplug 23 is inserted into the ear canal 110. That is, about half of the earplug 23 constitutes the insertion portion 17. The earplug 23 holds the acoustic unit 21 toward the back of the ear canal 110. More specifically, the earplug 23 holds the driver unit 12 toward the back of the ear canal 110 via the housing 22. The earplug 23 is in close contact with the side wall 222 a of the housing 22. The earplug 23 is in close contact with the inner wall 110 a of the ear canal 110.

  The ear plug 23 is a vibration transmitting material made of a viscoelastic foam. As an example of the material of the earplug 23, low resilience polyurethane can be mentioned. The earplug 23 deforms when compressed. When the ear plug 23 is not compressed, it slowly returns to its original shape.

  The earplug 23 fills the space between the side wall 222 a of the housing 22 and the inner wall 110 a of the ear canal 110. Between the driver unit 12 and the inner wall 110 a of the ear canal 110, the housing 22 and the earplug 23 are connected so as to transmit vibration.

  The earplug 23 is a transmission medium of the sound emitted from the driver unit 12. Part of the sound emitted from the driver unit 12 passes through the earplug 23. The earplug 23 partially absorbs the energy of the sound emitted from the driver unit 12. Part of the absorbed energy is vibrational energy with the earplug 23 as a medium.

  A part of the sound emitted from the sound emitting unit 12 a of the driver unit 12 is emitted (discharged as air vibration) into the space on the back side (tympanic membrane side) of the ear canal 110 through the earplug 23. A part of the sound emitted from the sound emitting unit 12 a of the driver unit 12 is transmitted to the inner wall 110 a of the ear canal 110 along the ear plug 23. The sound (vibration) transmitted to the inner wall 110 a of the ear canal 110 includes solid vibration with the ear plug 23 as a visco-elastic body as a medium. Part of the vibration of the driver unit 12 is transmitted to the inner wall 110 a of the ear canal 110 via the housing 22 and the earplug 23.

  The earplug 23 has sound insulation. The earplug 23 has a relatively high sound insulation to relatively high frequency sounds.

  The earphone 20 configured as described above has an extremely simple and novel appearance in which the spherical earplug 23 is provided at the tip of the cord 16.

  Further, the earphone 20 emits the sound from the sound emitting unit 12a of the driver unit 12 into the ear canal 110 without passing through the sound conduit 63 (FIG. 21). Further, the earphone 20 connects the driver unit 12 and the inner wall 110 a of the ear canal 110 via the housing 22 and the earplug 23 so as to be able to transmit vibrations. Therefore, the earphone 20 has better middle-to-low bass reproducibility than the canal-type earphone 60 illustrated in FIG.

  In addition, the earphone 20 is provided with a non-penetrating earplug 23. For this reason, the earphone 20 has high bass reproducibility compared with the one provided with the penetration type ear plug. This is because the earplug 23 has a property of high sound insulation (sound absorption) to relatively high frequency sound. That is, the sound emitted from the sound emitting unit 12 a of the driver unit 12 is amplified relative to the high frequency component relative to the high frequency component through the ear plug 23.

  Further, since the earphone 20 transmits the vibration of the driver unit 12 (including the sound from the sound emitting portion 12 a and the vibration of the driver unit 12 itself) to the inner wall 110 a of the ear canal 110 via the earplug 23, the driver unit 12. The reproduced sound can be transmitted to the auditory organ (ears bone, cochlea, etc.) not only by the vibration of air but also by the vibration of skin and bone. This works extremely well for the audibility of the playback sound.

  Further, the earphone 20 is suitable for use in combination with a microphone (pickup device) because the entire driver unit 12 is covered with the earplug 23 made of visco-elastic foam. That is, it is possible to prevent howling from occurring when the sound picked up by the microphone is reproduced by the earphone 20. This is because the earplug 23 made of visco-elastic foam has an effect of attenuating the sound of the peak frequency (the frequency that triggers howling) included in the sound from the driver unit 12. Moreover, the non-penetrating type earplug 23 has a better howling prevention performance as compared with the penetrating type.

  There is a gap between the sound release portion 12a of the driver unit 12 and the end plate 222b of the cover 222, and a gap between the side surface 12b of the driver unit 12 and the side wall 222a of the cover 222. A space S is formed between the driver unit 12 and the cover 222. In this case, part of the sound emitted from the sound emitting unit 12 a of the driver unit 12 is transmitted into the space S. Then, part of the sound transmitted into the space S is transmitted to the inner wall 110 a of the ear canal 110 through the side wall 222 a of the cover 222 and the earplug 23.

Fifth Embodiment
In the earphone 25 shown in FIG. 13, the storage chamber 23 a is open at one end of the ear plug 23. The acoustic unit 21 is accommodated in the accommodation chamber 23 a by exposing the outer end surface 221 b of the substrate 221.

  The earphone 25 configured as described above is more likely to cause sound leakage than the earphone 20 shown in FIG. In addition, the earplug 23 is easily detached from the sound unit 21. On the other hand, the earplug 23 can be easily attached to the acoustic unit 21.

  By setting the outer end face 221b of the substrate 221 to a spherical surface having the same curvature as the earplug 23, an earphone having an appearance similar to that of FIG. 11 can be realized.

Sixth Embodiment
The sound unit 21 of the earphone 26 shown in FIG. 14 has a substantially spherical cover 223. The earplug 23 of the earphone 26 shown in FIG. 14 has a substantially spherical housing 23a. The cover 223 includes a substantially hemispherical reflecting portion 223 a fixed to the substrate 221 and a substantially hemispherical transmitting portion 223 b fixed to the reflecting portion 223 a. The sound emitting unit 12 a of the driver unit 12 faces the transmitting unit 223 b. The reflector 223 a can reflect the sound from the driver unit 12. The transmitting portion 223 b can transmit the sound from the driver unit 12 well. As an example of the transmitting portion 223b, a member having a large number of holes or a net-like member can be mentioned.

  The earphone 26 configured as described above emits the sound from the sound emitting unit 12 a of the driver unit 12 into the ear canal 110 without passing through the sound conduit 63 (FIG. 21). In addition, the earphone 26 connects the sound unit 21 and the inner wall 110 a (FIG. 12) of the ear canal 110 via the earplug 23 so as to be able to transmit vibrations. For this reason, the earphone 26 has better middle-to-low bass reproducibility than the canal-type earphone 60 illustrated in FIG.

  Further, the earphone 26 emits most of the sound emitted from the sound emitting portion 12 a of the driver unit 12 into the ear plug 23 through the substantially hemispherical transmitting portion 223 b. For this reason, the earphone 26 can more effectively emit the sound from the driver unit 12 into the space on the far side (tympanic membrane side) of the ear canal 110 through the earplug 23 (release as air vibration). In addition, the earphones 26 can transmit the sound from the driver unit 12 to the inner wall 110 a of the ear canal 110 more effectively. In addition, a part of the vibration of the driver unit 12 can be transmitted to the inner wall 110 a of the ear canal 110 through the substrate 221, the reflection part 223 a and the earplug 23. For this reason, the earphone 26 has better audible performance than the earphone 25 shown in FIG.

Seventh Embodiment
The earphone 30 shown in FIGS. 15 and 16 has a shape in which two large and small elliptical spheres are combined. The earphone 30 has an insertion portion 32 and an outer portion 33. The insertion portion 32 is a smaller ellipsoid. The outer portion 33 is a larger ellipsoid. Ellipsoids include spheres. The insertion portion 32 is inserted into the ear canal 110. The outer portion 33 is disposed outside the ear canal 110. The outer portion 33 accommodates the entire driver unit 12. The outer portion 33 fits in the concha cavity 113 (see FIG. 20). The main body of the earphone 30 is an ear plug 31. The earplug 31 is non-penetrating.

  The earplug 31 has elasticity and flexibility. As an example of the material of the earplug 31, low resilience polyurethane can be mentioned. The insertion portion 32 and the outer portion 33 are integrally molded with each other to constitute the ear plug 31. A storage chamber 23 a is formed inside the outer side portion 33. The driver unit 12 is accommodated in the accommodation chamber 23a.

  The earplug 31 has a cut. The earplug 31 can mount the driver unit 12 in the storage chamber 23a through the cut.

  The earplug 31 has sound insulation. The earplug 15 has a relatively high sound insulation to relatively high frequency sounds.

  As shown in FIG. 16, most of the insertion portion 32 of the earplug 31 is inserted into the ear canal 110. The outer portion 33 contacts the periphery of the entrance of the ear canal 110. The insertion portion 32 of the earplug 31 holds the driver unit 12 toward the back of the ear canal 110. The ear plug 31 is in close contact with the driver unit 12. The earplug 31 is in close contact with the inner wall 110 a of the ear canal 110. The ear plug 31 is a vibration transmitting material. The ear plug 31 fills the space between the driver unit 12 and the inner wall 110 a of the ear canal 110. An ear plug 31 is connected between the driver unit 12 and the inner wall 110 a of the ear canal 110 so that vibration can be transmitted.

  The earplug 31 is a transmission medium of the sound emitted from the driver unit 12. Part of the sound emitted from the driver unit 12 passes through the earplug 31. The ear plug 31 partially absorbs the energy of the sound emitted from the driver unit 12. Part of the absorbed energy is vibrational energy with the ear plug 31 as a medium.

  A part of the sound emitted from the sound emitting part 12a of the driver unit 12 is emitted (released as air vibration) into the space on the back side (tympanic membrane side) of the ear canal 110 through a part of the outer part 33 and the insertion part 32 Be done. A part of the sound emitted from the sound emitting unit 12 a of the driver unit 12 is transmitted to the inner wall 110 a of the ear canal 110 along the insertion unit 32. A part of the vibration of the driver unit 12 is transmitted to the inner wall 110 a of the ear canal 110 through the insertion portion 32.

  One end 16 a of the cord 16 is connected to the signal terminal of the driver unit 12. The other end of the cord 16 extends from the end of the outer portion 33 to the outside of the earplug 31.

  As described above, the earphone 30 emits the sound from the sound emitting unit 12 a of the driver unit 12 into the ear canal 110 without passing through the sound conduit 63 (FIG. 21). Further, the earphone 30 connects the driver unit 12 and the inner wall 110 a of the ear canal 110 via the ear plug 31 so as to be able to transmit vibrations. For this reason, the earphone 30 has better middle-to-low bass reproducibility than the canal-type earphone 60 illustrated in FIG.

  In addition, the earphone 30 is provided with a non-penetrating ear plug 31. For this reason, the earphone 30 has high bass reproducibility compared with the one provided with the penetration type ear plug. This is because the insertion portion 32 of the earplug 31 has a property of high sound insulation (sound absorption) with respect to relatively high frequency sound. That is, the sound emitted from the sound emitting unit 12 a of the driver unit 12 passes through the inserting unit 32 so that the low frequency component is relatively amplified with respect to the high frequency component.

  Further, since the earphone 30 transmits the vibration of the driver unit 12 (including the sound from the sound emitting unit 12 a and the vibration of the driver unit 12 itself) to the inner wall 110 a of the ear canal 110 via the insertion unit 32, the driver unit The reproduced sound from T.12 can be transmitted to the auditory organ (ears bone, cochlea, etc.) not only by the vibration of air but also by the vibration of skin and bone. This works extremely well for the audibility of the playback sound.

  In addition, the earphone 30 is stably held in the ear by the insertion portion 32 fitting into the ear canal 110 and the outer side portion 33 fitting into the concha cavity 113 (see FIG. 20). In addition, the earphone 30 has a good wearing feeling because the ear plug 31 has elasticity and flexibility.

Eighth Embodiment
The earphone 35 shown in FIG. 17 is a wireless type of earphone. The earphone 35 does not have the cord 16 (FIG. 16). The earphone 35 has an acoustic unit 36. The outer side 33 accommodates the whole of the acoustic unit 36. A storage chamber 23 a is formed inside the outer side portion 33 of the earplug 31. The acoustic unit 36 is accommodated in the accommodation chamber 23a. The earplug 31 has a cut portion. The earplug 31 can mount the acoustic unit 36 in the storage chamber 23a through the cut portion.

  The acoustic unit 36 has a driver unit 12, a wireless module 37 and a housing 38. The wireless module 37 has a receiving unit, a battery, an operation unit, and a control unit (all are not shown). The receiving unit receives a signal wirelessly transmitted from a transmitter (an audio player, a smartphone, or the like, an audio content providing device). As a communication protocol between the receiver and the transmitter, Wi-Fi (registered trademark), Bluetooth (registered trademark), or other protocols can be used. The receiving unit converts the received signal into an electrical signal. The receiving unit inputs the converted electrical signal to the driver unit 12. The driver unit 12 converts the input electric signal into sound, and emits the sound from the sound emitting unit 12a. The battery supplies power to the driver unit 12 and the control unit. The control unit turns on / off the supply of power from the battery and increases / decreases the output of the electrical signal by the receiving unit according to the operation performed on the operation unit. The other configuration is the same as that of the earphone 30 of FIG.

  The earphone 35 configured as described above has better middle-to-low bass reproducibility compared with the canal-type earphone 60 illustrated in FIG.

[Ninth embodiment]
The earphone 40 shown in FIG. 18 has an oval hollow portion 32 a inside the insertion portion 32. The hollow portion 32 a is similar to the outer shape of the insertion portion 32. The hollow portion 32a and the storage chamber 23a communicate with each other via a narrow passage 31a. The other configuration is the same as that of the earphone 30 of FIG.

  The earphone 40 configured as described above has better middle-to-low bass reproducibility compared with the canal type earphone 60 illustrated in FIG. In addition, the earphone 40 has high tone reproducibility as compared to the earphone 30 of FIG.

Tenth Embodiment
The earphone 41 shown in FIG. 18 has a through hole (sound passage) 31c communicating from the storage chamber 23a to the insertion side tip 31b. The other configuration is the same as that of the earphone 30 of FIG.

  The earphone 41 configured as described above has better middle-to-low bass reproducibility compared to the canal-type earphone 60 illustrated in FIG. Further, although the earphone 41 is not good in bass reproducibility as compared with the earphone 30 of FIG. 16, it is excellent in treble reproducibility. In order to improve the high-pitched sound reproducibility, it is preferable that the diameter dimension of the through hole 31c be larger. In order to further improve middle-low tone reproducibility, it is preferable that the diameter dimension of the through hole 31c be smaller. In order to further improve middle-low tone reproducibility, the diameter dimension of the through hole 31c is preferably 1 mm or less in the non-compressed state.

  The embodiments of the present invention are not limited to the above-described embodiments, and various changes, substitutions, and modifications may be made without departing from the scope of the technical idea of the present invention.

  For example, although the earphone 10 of the first embodiment includes the cap 13, the cap 13 is not an essential component.

  Moreover, although the earphone 20 of 4th Embodiment is equipped with the spherical earplug 23, the earplug 23 may be an elliptical sphere. The same applies to the fifth and sixth embodiments.

  Moreover, in 7th Embodiment, although the insertion part 32 and the outer side part 33 which comprise the ear plug 31 are integrally molded, the insertion part 32 and the outer side part 33 which were each separately molded as another body are mutually joined as an ear plug 31 It is also good. Further, the materials (specific gravity, flexibility, sound permeability) of the insertion portion 32 and the outer portion 33 may be different.

  Further, in the seventh embodiment, although the outer side portion 33 accommodates the driver unit 12, the insertion portion 32 may accommodate the driver unit 12. In addition, the driver unit 12 may be partially accommodated by the insertion portion 32 and the outer portion 33. The same applies to the eighth to tenth embodiments.

  In the seventh embodiment, an acoustic unit 21 shown in FIG. 11 may be provided instead of the driver unit 12. The same applies to the ninth and tenth embodiments.

10 earphones (sound device)
10L earphone for left ear (sound device)
10R Right Ear Earphone (Sound Device)
12 Driver Unit 12a Sound Release Part 12b Side 13 Cap 15 Ear Plug (Support)
15a storage chamber 151 earplug (supporter)
151a hollow 152 earplug (supporter)
152a through hole 16 code 17 insertion portion 20 earphone (sound device)
21 acoustic unit 22 housing 223 cover
223a Reflector 223b Transmitter 23 Earplug (Holder)
25 earphones (sound device)
26 earphones (sound device)
30 earphones (sound device)
31 Earplug (holder)
31c through hole 32 insertion portion 32a hollow portion 33 outer portion 35 earphone (sound device)
36 sound unit 40 earphone (sound device)
41 earphone 100 ear 110 outer ear canal 110a inner wall

Claims (11)

A driver unit and a holder for holding the driver unit toward the ear canal,
The holder is
An acoustic device which is a vibration transmitting material which fills up between a side wall of the driver unit and an inner wall of an ear canal.   The acoustic device according to claim 1, wherein the holding body covers a sound emitting portion of the driver unit.   The acoustic device according to claim 1, wherein the holding body has a cavity communicating with a sound emitting portion of the driver unit.   The acoustic device according to claim 1, wherein the holding body has high sound insulation to relatively high frequency sounds as compared to relatively low frequency sounds.   The acoustic device according to any one of claims 1 to 4, wherein the holding body accommodates the entire driver unit. The holder is
And an insertion portion inserted into the ear canal,
The acoustic device according to claim 5, wherein the insertion portion accommodates all or a part of the driver unit. The holder is
An insertion portion inserted into the ear canal, and an outer portion disposed outside the ear canal,
The acoustic device according to claim 5, wherein the outer part accommodates all or part of the driver unit. It further has a cap which covers the said driver unit,
The acoustic device according to any one of claims 5 to 7, wherein the holding body accommodates the driver unit together with the cap. It further has a container that accommodates all or part of the driver unit,
The acoustic device according to any one of claims 5 to 7, wherein the holding body accommodates all or a part of the container.   The acoustic device according to any one of claims 1 to 9, wherein the holding body has stretchability and flexibility.   The acoustic device according to claim 10, wherein the holding body is a low repulsion foam or a low repulsion rubber.