Electroacoustic transducer and headphone

Abstract

[Problem ] To provide an electroacoustic transducer capable of maintaining stable performance. [Solution] An electroacoustic transducer 1 for transmitting vibration to bone comprises a main frame 10 having at least a cylindrical section, a vibration part 30 which is disposed inside of the main frame and vibrates along the axial direction of the main frame according to an input signal, and an elastic member 20 which is connected to at least the vibration part and is formed of an organic material or a polymer material.

Description

Electroacoustic transducers and headphones

[0001] The present invention relates to an electroacoustic transducer and headphones that provide bone conduction.

[0002] BACKGROUND ART Sound output devices are known that allow the user to hear air-conducted sound generated from the skull or the like into the ear canal via bone conduction by bringing the outer wall surface into contact with the skull or bones around the entrance of the ear canal.

[0003] For example, a bone conduction vibration source device for a mobile phone or the like has been known, which acoustically processes an audio signal for bone conduction vibration and outputs the processed signal as a drive signal to a bone conduction vibration source (see, for example, Patent Document 1). Also, a stereo earphone has been disclosed which has a bone conduction unit and a branch unit which is connected at one end to the bone conduction unit and serves as a vibration source (see, for example, Patent Document 2).

[0004] Sound output devices that use bone conduction have a vibrating unit that vibrates in response to audio signals. This vibrating unit may vibrate wildly at a resonance point, vibrating in an unintended direction and generating abnormal noise.

[0005] JP 2013-197730 A JP 2014-116755 A

[0006] An object of the present invention is to provide an electro-acoustic transducer and headphones that can maintain stable performance.

[0007] The electroacoustic transducer of the present invention is an electroacoustic transducer that transmits vibrations to bone, and comprises a main frame having at least a cylindrical portion, a vibration portion disposed inside the main frame and vibrating along the axial direction of the main frame in response to an input signal, and an elastic member formed from an organic or polymer material and connected to at least the vibration portion.

[0008] Furthermore, a headphone according to another aspect of the present invention comprises a headband and a pair of electro-acoustic transducers held at both ends of the headband, the electro-acoustic transducers being the electro-acoustic transducer described above.

[0009] According to the present invention, it is possible to provide an electro-acoustic transducer and headphones that can maintain stable performance.

[0010] FIG. 1 is a schematic perspective view showing an embodiment of headphones according to the present invention; FIG. 2 is a perspective view of a first embodiment of an electro-acoustic transducer according to the present invention, (a) seen from the front side, and (b) an exploded perspective view of the electro-acoustic transducer; FIG. 3 is a longitudinal cross-sectional view of the electro-acoustic transducer; FIG. 4 is a perspective view of a second embodiment of an electro-acoustic transducer according to the present invention, (a) seen from the front side, and (b) an exploded perspective view of the electro-acoustic transducer; FIG. 5 is a longitudinal cross-sectional view of the electro-acoustic transducer; FIG. 6 is a perspective view of a third embodiment of an electro-acoustic transducer according to the present invention, (a) seen from the front side, and (b) an exploded perspective view of the electro-acoustic transducer; FIG. 7 is a longitudinal cross-sectional view of the electro-acoustic transducer; FIG. 8 is a perspective view of a fourth embodiment of an electro-acoustic transducer according to the present invention, (a) seen from the front side, and (b) an exploded perspective view of the electro-acoustic transducer; FIG. 9 is a longitudinal cross-sectional view of the electro-acoustic transducer; FIG. 10 is a perspective view of a fifth embodiment of an electro-acoustic transducer according to the present invention, (a) seen from the front side, and (b) an exploded perspective view of the electro-acoustic transducer; FIG. 11 is a longitudinal cross-sectional view of the electro-acoustic transducer; FIG. 10A is a perspective view of a sixth embodiment of an electro-acoustic transducer according to the present invention, as seen from the front side, and FIG. 10B is an exploded perspective view of the electro-acoustic transducer. FIG. 10A is a longitudinal sectional view and FIG. 10B is a transverse sectional view of the electro-acoustic transducer. FIG. 10B is a longitudinal sectional view and FIG. 10B is a transverse sectional view of the electro-acoustic transducer. FIG. 10C is a longitudinal sectional view of an eighth embodiment of an electro-acoustic transducer according to the present invention. FIG. 10D is a longitudinal sectional view of a ninth embodiment of an electro-acoustic transducer according to the present invention. FIG. 10F is a graph showing frequency characteristics of the electro-acoustic transducer and an electro-acoustic transducer of related technology. FIG. 10F is a longitudinal sectional view of a first example of an electro-acoustic transducer according to related technology. FIG. 10G is a longitudinal sectional view of a second example of an electro-acoustic transducer according to related technology.

[0011] Hereinafter, embodiments of an electroacoustic transducer according to the present invention will be described with reference to the drawings. In the following description, the axial direction of the electroacoustic transducer 1 will be referred to as the Y direction, and the directions perpendicular to the Y direction will be referred to as the X direction and the Z direction. The surface facing the +Y direction will also be referred to as the top surface, and the surface facing the -Y direction will also be referred to as the bottom surface. Furthermore, the surface facing the -X direction will also be referred to as the front surface, and the surface facing the +X direction will also be referred to as the back surface.

[0012] Headphones As shown in FIG. 1 , headphones 1000 primarily comprise a pair of electroacoustic transducers 1, a pair of housings 2, and a headband 3. Each of the pair of housings 2 is approximately rectangular and houses an electroacoustic transducer 1 therein. The headband 3 is a roughly U-shaped member. Both ends of the headband 3 are curved in a direction approximately perpendicular to the U-shape, allowing the headband 3 to be placed over the wearer's ears when worn. Housings 2 are connected to both ends of the headband 3. That is, the electroacoustic transducer 1 is held at both ends of the headband 3 via the housings 2. When worn, the headband 3 sandwiches the wearer's head, and the housings 2 are pressed against the ears by the elastic force of the headband 3. Note that in this embodiment, a configuration in which the electroacoustic transducer primarily transmits vibrations to ear cartilage is described, but the technical scope of the present invention is not limited thereto and includes headphones and electroacoustic transducers that transmit vibrations to cartilage other than ear cartilage and any bone, including hard bones such as the skull.

[0013] Electroacoustic Transducer (1) First, a first embodiment of the electroacoustic transducer of this embodiment will be described. The electroacoustic transducer 1 is, for example, a headphone unit. As shown in Figures 2(a) and 2(b), the electroacoustic transducer 1 is a substantially cylindrical member that is worn as a pair on the left and right ears, respectively. The electroacoustic transducer 1 mainly includes a main frame 10, an elastic member 20, a vibrating section 30, a coil 40, and a unit base 50.

[0014] The main frame 10 is a member having a cylindrical portion that defines the outer wall of the electro-acoustic transducer 1. In this embodiment, the main frame 10 is substantially cylindrical, but any other appropriate structure such as an elliptical cylindrical shape or a rectangular cylindrical shape can be adopted.

[0015] The elastic member 20 is a cylindrical member disposed inside the main frame 10. In this embodiment, the elastic member 20 is disposed around the circumferential direction of the vibrating section 30. The elastic member 20 is a member formed of an organic or polymeric material having elasticity. The elastic member 20 is a member that exerts elasticity due to, for example, a porous structure, more specifically, urethane foam. The elastic member 20 may also be formed of an appropriate sponge material. Furthermore, the elastic member 20 may be composed of an elastic body such as rubber or a gel material.

[0016] The elastic member 20 holds the vibrating section 30 to the main frame 10. The elastic member 20 is connected to the outer peripheral surface of the vibrating section 30 along the vibration direction and the inner peripheral surface of the main frame 10. For example, the elastic member 20 may be adhered to the outer peripheral surface of the vibrating section 30 and the inner peripheral surface of the main frame 10 with an appropriate adhesive. As a result, the elastic member 20 controls the vibration of the vibrating section 30.

[0017] The vibration section 30 is a member disposed inside the through-hole 13 of the main frame 10. The vibration section 30 vibrates inside the through-hole 13 along the axial direction of the through-hole 13 in response to a signal.

[0018] As shown in FIG. 2B, the vibrating section 30 mainly includes a cap yoke 31 , a magnet 32 ​​, and a center yoke 33 .

[0019] The cap yoke 31 is a cylindrical member with a bottom that forms the upper and side surfaces of the vibrating section 30. The end on the upper surface (+Y side) of the cap yoke 31 is exposed on the upper surface (+Y side) of the electro-acoustic transducer 1. As shown in FIG. 3 , the lower end on the -Y side of the cap yoke 31 faces the unit base 50 with a gap therebetween. The inner diameter of the cap yoke 31 is larger than the outer diameter of the coil 40. As a result, the cap yoke 31 covers part of the outer periphery of the coil 40. The elastic member 20 is connected to the outer periphery of the cap yoke 31.

[0020] The magnet 32 ​​is a substantially cylindrical magnet and is disposed inside the cap yoke 31. The magnet 32 ​​may be connected to the inner bottom surface of the cap yoke 31. The center yoke 33 is a disk-shaped member connected to the lower end of the magnet 32. The outer diameter of the magnet 32 ​​is smaller than the inner diameter of the hole 40a of the coil 40. Therefore, the magnet 32 ​​and the center yoke 33 can move axially (y direction) inside the hole 40a. A Lorentz force is generated between the magnet 32 ​​and the coil 40. As a result, the vibrating part 30 vibrates in the axial direction.

[0021] The coil 40 is an annular member and is held by a unit base 50. The magnet 32 ​​and the center yoke 33 are inserted into a hole 40a formed in the center of the coil 40.

[0022] As explained above, the vibration direction in which the vibration unit 30 vibrates in response to a signal is the Y direction, which is different from the vertical direction when the device is attached. That is, the vibration unit 30 is subjected to gravity in a direction different from the vibration direction. The elastic member 20 supports the vibration unit 30 by connecting it to the main frame 10 and the vibration unit 30. That is, the elastic member 20 can prevent the vibration unit 30 from sagging due to gravity.

[0023] The elastic member 20 has a predetermined hardness and restitution coefficient. As a result, the elastic member 20 damps and eliminates abnormal oscillations at the resonance point of the vibrating section 30, and suppresses displacement of the vibrating section 30 in directions other than the vibration direction. Furthermore, the elastic member 20 is connected to the vibrating section 30 along the circumferential direction, thereby suppressing displacement of the vibrating section 30 in the rotational direction. Displacement of the vibrating section 30 in directions other than the vibration direction in response to a signal can cause abnormal noise. In contrast, the elastic member 20 suppresses abnormal noise by preventing displacement in directions other than the axial direction, thereby improving the sound quality of the electro-acoustic transducer 1. The characteristics of the elastic member 20, such as the hardness and restitution coefficient, are appropriately adjusted depending on the desired sound quality and the mass or shape of the vibrating section 30.

[0024] Here, an electroacoustic transducer 1a of the related art will be described with reference to Fig. 19. The electroacoustic transducer 1a shown in Fig. 19 mainly includes a cylindrical main frame 10a, a disk-shaped suspension 20a, and a vibrating section 30a that vibrates inside the main frame 10a.

[0025] The suspension 20a abuts against the inside of a flange 15a formed on the inner wall of the main frame 10a. The center of the vibrating part 30a is connected to the center of the suspension 20a by a connecting member such as a screw. As a result, the vibrating part 30a is supported by the flange 15a via the suspension 20a. Therefore, the fulcrum of vibration of the vibrating part 30a is the connecting member, and the point of contact between the suspension 20a and the flange 15a is the point of action. In this way, an electro-acoustic transducer 1a in which the center of gravity of the vibrating part 30a and the fulcrum of vibration are separated may experience uncontrollable vibrations at the resonance point, i.e., vibrations in unintended directions. Uncontrollable vibrations at the resonance point may cause abnormal noise.

[0026] In addition, in Figure 19, the vertical direction in the mounted state is the downward direction on the page. The vibration direction in which the vibrating part 30a vibrates in response to a signal is different from the vertical direction in the mounted state. Therefore, gravity acts on the vibrating part 30a in a direction different from the vibration direction. The first end side of the vibrating part 30a is connected to the suspension 20a at approximately the center, while the second end side is not supported and is in a cantilever state. Therefore, the second end of the vibrating part 30a hangs down in the direction of gravity. As a result, an unnecessary moment or twist is generated in the electro-acoustic transducer 1a during resonance. This moment or twist can cause the transducer to move wildly or break.

[0027] Furthermore, the mass of the vibrating unit 30a in the electroacoustic transducer 1a that transmits vibrations to the ear cartilage is larger than that of a headphone unit that vibrates a diaphragm, because it vibrates the ear cartilage. Therefore, the sagging of the vibrating unit 30a and its fluctuation at the resonance point are even greater than in a headphone unit that has a diaphragm. As a result, the sagging and fluctuation can cause malfunctions.

[0028] Furthermore, the vibrating section 30a of the electroacoustic transducer 1a may vibrate due to external vibrations. In this case, the vibration of the vibrating section 30a generates an electromotive force in the coil 140 disposed opposite the vibrating section 30a. As a result, in a headphone unit having a vibrating section, the vibration may produce abnormal noise that may be mixed into the sound.

[0029] 20 mainly includes a cylindrical main frame 10b, a vibrating section 30b that vibrates inside the main frame 10b, a disk-shaped suspension 20b that holds the vibrating section 30b at a first end of the main frame 10b, and a flat damper 60b that holds the vibrating section 30b at a second end of the main frame 10b. The suspension 20b is formed of, for example, a metal leaf spring.

[0030] The vibrating unit 30b is held at a first end and a second end of the main frame 10b via the damper 60b. Therefore, the electro-acoustic transducer 1b is less likely to break down because unintended vibration of the vibrating unit 30 is suppressed. Furthermore, the elastic member 20 and the damper 60b, each having elastic force, are interposed between the vibrating unit 30b and the main frame 10b, so the amplitude (Q value) at the resonance point is effectively controlled. As a result, even in a configuration using cartilage conduction in which the vibrating unit 30b has a larger mass than a headphone unit having a diaphragm, an electro-acoustic transducer 1b that suppresses unintended vibration and provides high sound quality can be realized.

[0031] On the other hand, the suspension 20b of the electroacoustic transducer 2b of the related art is a metal leaf spring, which may be subject to plastic deformation, may be significantly affected by resonance, and may be expensive.

[0032] In this regard, the electroacoustic transducer 1 according to the present invention includes an elastic member 20 formed of an organic or polymeric material having a predetermined or higher elasticity, instead of an elastic member that exhibits elasticity due to a metal or resin structure. Therefore, the electroacoustic transducer 1 according to the present invention reduces the risk of plastic deformation of the elastic member 20. Furthermore, the influence of resonance can be reduced and the electroacoustic transducer 1 can be constructed inexpensively.

[0033] 18 shows the frequency characteristics of a headphone unit. That is, the horizontal axis represents frequency, and the vertical axis represents output level (dBV). The dashed line represents the frequency characteristics of an electro-acoustic transducer 1a according to the related art, the dashed line represents the frequency characteristics of an electro-acoustic transducer 1b according to the related art, and the solid line represents the frequency characteristics of the electro-acoustic transducer 1 according to the present invention.

[0034] The electroacoustic transducer 1a of the related art has a resonance point F0. The frequency of the resonance point F0 is determined by the relationship between the spring constant of the suspension 20a and the weight of the vibrating part 30a. As a result, the electroacoustic transducer 1a may cause discomfort to the head of the wearer due to extremely large vibrations generated at the frequency of the resonance point F0.

[0035] The frequency characteristics of the electroacoustic transducer 1b of the related art are smoother than those of the electroacoustic transducer 1a because low-frequency resonance is damped by the damper 60b. In other words, the electroacoustic transducer 1b can suppress unintended resonance and reduce discomfort to the head.

[0036] The frequency characteristics of the electroacoustic transducer 1 according to the present invention are similar to those of the electroacoustic transducer 1b of the related art, with low and smooth peaks. Furthermore, the peak frequency is higher than the resonance point F0 of the electroacoustic transducer 1a. Therefore, it can be said that the damping provided by the elastic member 20 is functioning satisfactorily. Furthermore, the frequency characteristics of the electroacoustic transducer 1 according to the present invention also have sufficiently high sensitivity, and it can be seen that a sound pressure equal to or greater than that of the electroacoustic transducer 1a can be achieved over a wide frequency band.

[0037] Electroacoustic Transducer (2) Here, a different embodiment of the electroacoustic transducer of this embodiment will be described, focusing on differences from the previously described embodiment. Note that the same components as those in the first embodiment are designated by the same reference numerals. Furthermore, the electroacoustic transducers described below have the same configuration as the electroacoustic transducer 1 unless otherwise specified. The electroacoustic transducer 101 of the second embodiment shown in FIGS. 4 and 5 differs from the first embodiment in that the main frame 110 and the elastic member 120 form a bottomed cylindrical body in which bottoms 112 and 122 are connected to cylindrical portions 111 and 121, respectively. The surface of the vibrating portion 30 facing the vibration direction, i.e., the outer wall surface 31a of the cap yoke 31, faces the bottom 112 of the main frame 110 via the elastic member 120. Furthermore, the cylindrical portion 121 of the elastic member 120 is connected to the cylindrical portion 111 of the main frame 10, and the bottom 122 of the elastic member 120 is connected to the bottom 112 of the main frame 10. This configuration facilitates positioning in the axial direction (Y direction), resulting in high productivity. Furthermore, since the vibration section 30 is not exposed, the risk of breakage can be reduced. Appropriate openings may be formed in the elastic member 120. Slits may also be formed in the elastic member 120. This configuration improves the flexibility of the elastic member 120.

[0038] Electroacoustic Transducer (3) The electroacoustic transducer 201 of the third embodiment shown in FIGS. 6 and 7 includes a suspension 260 in addition to the electroacoustic transducer 101 of the second embodiment. The suspension 260 is a member having a protrusion 262 at the center of a substantially circular disk portion 261. The disk portion 261 has multiple holes formed therein, forming a spring that exerts elastic force in the Y direction. The radial end of the disk portion 261 is engaged with one end of the main frame 10. In the vibrating portion 230 included in the electroacoustic transducer 201, a hole 233a is formed in the approximate center of the center yoke 233, extending along the axial direction of the main frame 10. The suspension 260 is connected to the vibrating portion 230 by inserting the protrusion 262 into the hole 233a. As a result, the suspension 260 regulates the position of the vibrating portion 230 and limits vibration of the vibrating portion 230 in the Y direction. According to this configuration, the position of the vibration section 230 is determined by the suspension 260, making assembly easy.

[0039] Electroacoustic Transducer (4) The fourth embodiment of the electroacoustic transducer 301 shown in FIGS. 8 and 9 differs from the previously described embodiments in that it includes multiple elastic members 320. The elastic members 320 include a small member 320a disposed on the bottom surface of the cap yoke 31 and small members 320b, 320c, 320d, and 320e disposed at intervals along the circumferential direction of the cap yoke 31. While the number of small members 320b to 320e is four in this embodiment, the number is not limited to this. Appropriate connecting members may also be included to connect the small members 320a to 320e. The elastic members 320 are preferably made of a gel material, which is a relatively hard material. This configuration reduces the contact area of ​​the elastic member 320 compared to the elastic member 120 of the bottomed cylinder, allowing the vibrating unit 30 to vibrate more strongly.

[0040] Electro-acoustic Transducer (5) An electro-acoustic transducer 401 of a fifth embodiment shown in Figures 10 and 11 includes a cylindrical unit base 450 with a bottom. The unit base 450 has a side wall 451 that extends to cover the side surface of the vibration section 30. An elastic member 20 is connected to the inner peripheral surface of the side wall 451. The elastic member 20 is also connected to a cap yoke 31 that forms the outer periphery of the vibration section 30. With this configuration, the side wall 451 of the unit base 450 corresponds to the cylindrical portion of the main frame, and no additional member is required, thereby simplifying the configuration.

[0041] 12 and 13 includes a housing 570 that houses the vibration unit 30. The housing 570 houses the elastic member 20, the vibration unit 30, the coil 40, and the unit base 50, for example, by fitting an upper housing 570a and a lower housing 570b together. The shape of the housing 570 is a substantially rectangular parallelepiped in the figures, but is not limited to this, and any appropriate shape that matches the external shape of the headphones 1000 can be adopted.

[0042] 13(a), a protruding rib 571 is formed on the inside of the upper housing 570a. The rib 571 is, for example, cylindrical, corresponding to the elastic member 20, but is not limited to this and may be formed of, for example, a plurality of protrusions. The elastic member 20 is connected to the inside of the rib 571. The elastic member 20 may be bonded to the rib 571, for example. Even with this configuration, the rib 571 of the upper housing 570a corresponds to the cylindrical portion of the main frame, and a separate member is not required, thereby simplifying the configuration.

[0043] Electroacoustic Transducer (7) The seventh embodiment of the electroacoustic transducer 601 shown in FIGS. 14 and 15 differs from the previously described embodiments in that a cylindrical elastic member 620 and a shaft member 660 inserted through the elastic member 620 are disposed at the vibration direction end of the vibrating section 30. The radius of the elastic member 620 is smaller than the inner diameter of the coil 40. The elastic member 620 and the shaft member 660 are connected to the surface of the center yoke 33 facing the vibration direction, radially inward of the main frame 10 and the coil 40. The elastic member 620 is also fitted into a hole 651 formed in the unit base 650. It is preferable to use a material for the elastic member 620 that is relatively harder than the elastic member 20. This configuration also limits the vibration of the vibrating section 30 in the Y direction. Furthermore, this configuration allows the electroacoustic transducer 601 to be constructed with a small number of parts.

[0044] Electroacoustic Transducer (8) An electroacoustic transducer 701 of an eighth embodiment shown in Fig. 16 differs from the previously described embodiments in that elastic members 720 are disposed in front of and behind the vibration direction of the vibrating section 730. The electroacoustic transducer 701 includes a housing 770 that houses the vibrating section 730. The housing 770 is composed of, for example, an upper housing 770a that forms the upper part of the housing 770 in the figure, and a lower housing 770b that forms the lower part in the figure. The housing 770 is another example of a main frame.

[0045] The housing 770 mainly accommodates the coil 40, the vibrating unit 730 inserted into the coil, and the elastic member 720. The coil 40 is fixed to the inside of the housing 770. The vibrating unit 730 is composed of, for example, a magnet 733 and a center yoke 760. The vibrating unit 730 is configured such that, for example, two magnets 733 sandwich the center yoke 760. In this case, the two magnets 733 sandwich the center yoke 760 with their like poles, i.e., their south poles or north poles, facing each other. This configuration can improve sensitivity compared to a configuration with one magnet and one center yoke.

[0046] The elastic members 720 are disposed on both the front and rear sides of the vibration direction of the vibration unit 730. The elastic members 720 may be disposed only on either the front or rear side in the vibration direction. The first end of the elastic member 720 is connected to the inside of the housing 770, and the second end is connected to the vibration unit 730. When a current flows through the coil 40, the vibration unit 730 deforms the elastic member 720 and vibrates primarily in the up-down direction in the figure. This configuration allows for a simple structure with a small number of parts. Furthermore, the simple structure allows for a robust construction. Furthermore, the acoustic characteristics can be adjusted by selecting the material of the elastic member 720. For example, by selecting a material with a low restitution coefficient, it is possible to suppress steep resonance.

[0047] Electro-acoustic transducer (9) An electro-acoustic transducer 801 of the ninth embodiment shown in Fig. 17 differs from the previously described embodiments in that it has a vibrating section 830 configured by connecting one magnet 833 and one center yoke 860, instead of the vibrating section 730 shown in Fig. 16. In this case, as shown in the figure, the coil 40 may be disposed closer to the end of the vibrating section 830 in the vibration direction, in accordance with the position of the center yoke 860. Even with this configuration, an electro-acoustic transducer 801 with high sound quality can be realized while suppressing unintended vibrations.

[0048] The above-described configuration also provides an electro-acoustic transducer that generates bone conduction vibrations while reducing abnormal noise and providing high-quality sound. While the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and variations are possible within the scope of the gist thereof.

[0049] REFERENCE SIGNS LIST 1 electroacoustic transducer 10 main frame 20 elastic member 30 vibration section 40 coil 50 unit base 1000 headphones

Claims

1. An electroacoustic transducer that transmits vibrations to bone, a main frame having at least a cylindrical portion; a vibration unit disposed inside the main frame and vibrating along the axial direction of the main frame in response to an input signal; an elastic member made of an organic or polymer material and connected to at least the vibration unit; Equipped with The elastic member is a member disposed around the circumferential direction of the vibration part. Electroacoustic transducer.

2. The elastic member exerts the elastic force due to a porous structure.

2. The electroacoustic transducer according to claim 1.

3. the elastic member is connected to an outer peripheral surface of the vibrating section along the vibration direction and an inner peripheral surface of the main frame; 2. The electroacoustic transducer according to claim 1.

4. The elastic member is a cylindrical member.

4. The electroacoustic transducer according to claim 3.

5. The elastic member is provided in plurality.

4. The electroacoustic transducer according to claim 3.

6. the main frame is a bottomed cylindrical body having a bottom connected to the cylindrical portion, a first surface facing the vibration direction of the vibration unit faces the bottom portion; The elastic member is connected to at least the bottom portion.

2. The electroacoustic transducer according to claim 1.

7. The elastic member is connected to the cylindrical portion and the bottom portion of the main frame.

7. The electroacoustic transducer according to claim 6.

8. a unit base that covers a second surface facing the vibration direction of the vibration unit; the unit base has a side wall extending to cover a side surface of the vibration section, The elastic member is connected to the inner periphery of the side wall of the unit base.

2. The electroacoustic transducer according to claim 1.

9. a housing that houses the vibration unit, The elastic member is connected to the housing.

2. The electroacoustic transducer according to claim 1.

10. The elastic member is connected to a second surface facing the vibration direction of the vibration unit.

2. The electroacoustic transducer according to claim 1.

11. a suspension that is fastened to a first end of the main frame and that holds the vibration unit; the suspension has a protrusion that is inserted into the vibration section along the axial direction of the main frame.

2. The electroacoustic transducer according to claim 1.

12. A headband and a pair of electroacoustic transducers held at both ends of the headband, respectively; Equipped with The electro-acoustic transducer is an electro-acoustic transducer according to any one of claims 1 to 11. headphone.