TWI532390B - Electro-acoustic transducer - Google Patents

Description

Electroacoustic converter

The present invention relates to an electroacoustic transducer, and more particularly to an electroacoustic transducer that utilizes an existing component of an electroacoustic transducer for embedding in a housing and as a tuning structure.

As the market demand continues to change, various electronic products are developing more rapidly. Among them, the speaker is an important component of the sound output end of the electronic product, and the requirements for the speaker are also oriented toward miniaturization, high sound quality, low cost, etc., in order to meet the requirements. Demand in the market.

As shown in the first figure, it is a conventional speaker exploded view. The speaker 1 includes a casing 10, an upper cover 11, a diaphragm 12, a voice coil 13, a pole piece 14, a magnet 15, a depressed lower piece 16, and a tuning net 17.

The housing 10 has a mounting hole 10a at the center thereof, and a plurality of vent holes 10b are formed in the periphery of the mounting hole 10a. The lower piece 16 is embedded in the mounting hole 10a of the housing 10. The bottom end of the magnet 15 is fixed to the lower piece 16, and the pole piece 14 is fixed to the magnet. The top end of the voice coil 13 is fixed to the bottom of the diaphragm 12, and the voice coil 13 is suspended around the pole piece 14, the magnet 15 and the lower piece 16. The periphery of the diaphragm 12 is disposed on the periphery of the top end of the casing 10, and the upper cover 11 has a plurality of sound holes 11a. The upper cover 11 is disposed above the periphery of the vibrating membrane 12 and fastened to the top end edge of the casing 10. The tuning net 17 is adhered to the bottom of the casing 10 to shield the vent holes 10b.

When the voice coil 13 is turned on, the magnetic circuit formed by the magnetic pole piece 14, the magnet 15 and the lower piece 16 drives the voice coil 13 to cause the diaphragm 12 to oscillate, and the sound is emitted from the sound hole 11a and the vent hole 10b.

As shown in the second figure, a cross-sectional view of the conventional speaker is shown in the first figure. The speaker 1 is pasted to the tuning net 17 by the bottom vent hole 10b, so that the tuning net 17 shields the sound hole 10b, so that the small hollow portion of the tuning net 17 forms a new channel for sound, for adjusting the sound emitted by the speaker 1. The sound improves the acoustic performance of the speaker 1.

However, in the assembly process, the speaker 1 needs to be adhered to the process of the tuning network 17 to obtain better acoustic performance, so that the assembly cost cannot be effectively reduced, which causes the competition of the industry, and the tuning network 17 is used as the sound of the speaker 1. Damping, in addition to the height of the tuning net 17 itself, if excessive glue is used, the overall height of the speaker 1 is slightly increased, which is not conducive to the miniaturization of the speaker. Furthermore, the tuning net 17 is adhered to the vent of the housing 10. At 10b, there is a possibility that the glue overflows and blocks part of the mesh, which will affect the sound output of the speaker 1.

In addition, when the lower piece 16 is injection molded in the casing 10, the lower piece 16 is embedded in the mounting hole 10a of the casing 10, so that the lower piece 16 is integrally formed with the casing 10. However, the peripheral wall thickness of the lower piece 16 is too thin, so that the lower piece 16 The bonding effect between the sheet 16 and the housing 10 is not stable. When the bottom of the speaker 1 is pressed, it is easy to cause looseness between the internal structures, causing variations in the acoustic performance of the speaker 1 and reducing the quality of the speaker 1. Therefore, the above-mentioned conventional knowledge There are still shortcomings in the speaker 1 and there is room for improvement.

In view of the above problems, an object of the present invention is to provide an electroacoustic transducer using an existing component of an electroacoustic transducer for embedding in a casing and as a tuning structure, thereby omitting the conventional tuning mesh member and its pasting process. In order to achieve the characteristics of cost reduction and structural stability.

Therefore, in order to achieve the above object, the present invention discloses an electroacoustic transducer comprising a casing, a voice coil, a diaphragm and a magnetic driving device. The housing has a vent hole at one end and a sound hole at the other end. The voice coil is disposed in the housing, the diaphragm is coupled to the top of the voice coil and can be coupled therewith, and the magnetic drive device is used to drive the voice coil to vibrate and has a bonding zone. And a damping zone, the bonding zone is embedded in a part of the casing, and the damping zone is arranged on the path of the diaphragm to the venting hole, thereby adjusting the sound volume of the venting hole. Therefore, the electroacoustic transducer of the present invention does not need to use the conventional tuning network member and the process of attaching the same, so that the problem that the generated adhesive is blocked by the mesh and the complicated assembly process can be eliminated, and the utility model can be reduced. Cost and avoid acoustic performance is affected.

In order to achieve the above object, the magnetic driving device of the electroacoustic transducer of the present invention is provided with a plurality of perforations on the bonding region and the damping region, and can be implemented on the magnetic conductive member of the magnetic driving device of the inner magnetic or outer magnetic type, so that The magnetic drive device is tightly embedded in the housing of the electroacoustic transducer, and the damper region of the magnetic drive device shields the vent hole of the housing for adjusting the sound emitted by the electroacoustic transducer, thereby improving the acoustic performance of the electroacoustic transducer In this way, the magnetic driving device has the effect of tuning, and the plurality of perforations and the shell embedding in the joint region of the magnetic driving device can obtain a better combined effect, thereby avoiding the internal structure of the electroacoustic converter being susceptible to external force and causing loose structure. , causing problems with acoustic performance being affected.

In addition, in another embodiment of the electroacoustic transducer of the present invention, a plurality of perforations are provided on the fixing portions of the pair of terminals, and a combination region and a damping region are distinguished, and the damping region can also shield the ventilation holes of the housing. The function of adjusting the amount of sound gas, and the bonding area can also make the terminal fixed portion and the electroacoustic converter buried, and the terminal is closely embedded in the electroacoustic transducer, and the acoustic performance of the electroacoustic transducer can be improved. .

Hereinafter, an embodiment of the electroacoustic transducer of the present invention will be described with reference to the drawings.

Please refer to the third figure, which is a schematic diagram of a first embodiment of the electroacoustic transducer of the present invention. The electroacoustic transducer 2 includes a housing 20, a diaphragm 21, a voice coil 22, and a magnetic drive unit 23.

The housing 20 is made of plastic and is composed of a base 201 and an upper cover 202. The base 201 has a mounting hole 201a at the center, and a vent hole 201b is formed at the periphery of the mounting hole 201a. The upper cover 202 is coupled to the top end of the base 201 and is provided with a plurality of sound holes 202a.

The magnetic driving device 23 is composed of a first magnetic guiding member 24, a magnet 25 and a second magnetic guiding member 26. The first magnetically permeable member 24 has a recessed receiving portion 241 and is received in the mounting hole 201a of the base 201. The peripheral portion of the accommodating portion 241 is provided with a wing portion 242. The wing portion 242 has a plurality of through holes 243 and is divided into a plurality of holes 243. a damping zone and a bonding zone, the damping zone is used for shielding the vent hole 201b, and the bonding zone is embedded with the base 201, wherein the bonding zone is a portion of the unshielded vent hole 201b, and the plastic of the molding base 201 is provided to fill the bonding zone. The plurality of through holes 243 are formed to form a stable bond between the first magnetically permeable member 26 and the base 201.

The magnet 25 is disposed in the accommodating portion 241 of the first magnetic conductive member 24 and spaced apart from the wall edge of the accommodating portion 241.

The second magnetic conductive member 26 is disposed at the top end of the magnet 25 such that the first magnetic conductive member 24, the second magnetic conductive member 26 and the magnet 25 constitute an inner magnetic magnetic driving device.

The voice coil 22 is suspended from the periphery between the first magnetic conductive member 24, the second magnetic conductive member 26, and the magnet 25, and is driven by the magnetic driving device 23.

The bottom end of the diaphragm 21 is coupled to the top end of the voice coil 22, and the diaphragm 21 can be interlocked with the voice coil 22.

The upper cover 202 is kept at a distance from the diaphragm 21 to cover and protect the diaphragm 21.

When the voice coil 22 is turned on by the current, the magnetic field generated by the voice coil 22 and the magnetic driving device 23 generates magnetism or magnetic repulsion to vibrate, thereby driving the diaphragm 21 to oscillate, so as to push the surrounding air to generate sound, and The sound hole 202a emits a sound.

Referring to the fourth figure, there is shown a cross-sectional view of a first embodiment of the electroacoustic transducer of the present invention. The damper region of the wing portion 242 of the first magnetically permeable member 24 of the electroacoustic transducer 2 shields the vent hole 201b, the joint region is embedded with the base 201, and the portion of the wing portion 242 and the base portion 201 is embedded by the plurality of perforations. The design of 243 provides a plastic filling space, so that the wing portion 242 can be tightly covered by the molding plastic of the base 201, and can be firmly restrained not only in the lateral direction and the longitudinal direction, so that the base 201 and the first magnetic conductive member 24 are The bonding ability between the two is effectively improved, and the first magnetic conductive member 24 of the electroacoustic transducer 2 can be firmly embedded in the bottom end of the base 201 to restrict the inner member from being separated from the base 201; when the bottom of the electroacoustic transducer 2 is subjected to During the pressing, since the first magnetic conductive member 24 is embedded in the base 201 by the wing portion 242 in a large area, and the partial perforation 243 is filled with the molding plastic of the base 201, the first magnetic conductive member 24 is not easily affected by the external force. Loosening of the internal structure of the electroacoustic transducer 2 is also avoided, thereby reducing the possibility of degradation of the acoustic performance of the electroacoustic transducer 2.

Please refer to the fifth figure, which is a bottom view of the first embodiment of the electroacoustic transducer of the present invention. The wing portion 242 of the first magnetically permeable member 24 has a plurality of perforations 243, and the damper region of the wing portion 242 shields the vent hole 201b. When the electroacoustic transducer 2 is activated to emit sound, the aperture 243 through the wing portion 242 is smaller than the aperture 243. The vent hole 201b is characterized in that the plurality of perforations 243 form a new passage for sound, so that the sound is discharged therefrom, so that the amount of sound emitted by the electroacoustic transducer 2 can be adjusted, thereby obtaining better acoustic performance.

The invention utilizes the joint region of the first magnetic conductive member 24 to be embedded in the base 201, and the damping region of the first magnetic conductive member 24 serves as a tuning structure of the vent hole 201b, so that no adhesion is required during assembly of the electroacoustic transducer 2 The process of the tuning network, and the absence of adhesive overflow and blocking the mesh, can ensure that the acoustic performance of the electroacoustic transducer 2 is not affected, and at the same time has the advantages of simple structure and reduced assembly cost.

Please refer to the sixth figure, which is an exploded view of a second embodiment of the electroacoustic transducer of the present invention. The electroacoustic transducer 3 of this embodiment includes a housing 30, a diaphragm 31, a voice coil 32, and a magnetic drive unit 33.

The housing 30 is made of plastic. The housing 30 includes a base 301 and an upper cover 302. The base 301 has a mounting hole 301a at the center. Each of the mounting holes 301a is provided with a vent hole 301b. The bottom edge of the mounting hole 301a is provided. A stop portion 301c is provided.

The magnetic driving device 33 is composed of a first magnetic guiding member 34, a magnet 35 and a second magnetic guiding member 36. The first magnetic conductive member 34 has an inverted T shape and has a column 341 at the center. The first magnetic conductive member 34 is provided with a step portion 342 around the periphery thereof so that the first magnetic conductive member 34 is disposed on the mounting hole 301a of the base 301. In the meantime, the step portion 342 abuts against the stopper portion 301c, and the stopper portion 301c stops the limit position, so that the first magnetic conductive member 34 cannot be separated from the other end of the base 301.

The magnet 35 is annularly disposed to be placed on the post 341 of the first magnetically permeable member 34, and the inner edge of the magnet 35 is spaced apart from the post 341.

The second magnetically permeable member 36 is disposed at the top end of the magnet 35 such that the first magnetically permeable member 34, the second magnetically permeable member 36, and the magnet 35 constitute an external magnetic magnetic drive device 33. The second magnetic conductive member 36 has a coupling hole 361 for traversing the column 341 of the first magnetic conductive member 34. The second magnetic conductive member 36 is provided with a plurality of through holes 362 at the periphery of the coupling hole 361 and distinguishes a bonding region and a damping region. When the base 301 is injection molded, the second magnetically permeable member 36 is embedded in the base 301 and integrated with the base 301. The damper region of the second magnetically permeable member 36 shields the vent hole 301b, and the plurality of through holes 362 and the vent hole are formed. The 301b is aligned, and the joint area of the unshielded vent 301b is embedded with the base 301, and the plastic of the molded base 301 is filled into the plurality of through holes 362 to form a better relationship between the second magnetic conductive member 36 and the base 301. Combine.

The voice coil 32 is suspended from the periphery between the first magnetic conductive member 34, the second magnetic conductive member 36, and the magnet 35, and is driven by the magnetic circuit.

The bottom end of the diaphragm 31 is coupled to the top end of the voice coil 32, and the diaphragm 31 is interlocked with the voice coil 32.

The upper cover 302 has a plurality of sound holes 302a. The upper cover 302 is fixedly coupled to the top edge of the base 301 and is spaced apart from the diaphragm 31 to cover and protect the diaphragm 31.

7 is a cross-sectional view showing a second embodiment of the electroacoustic transducer of the present invention. The damper region of the second magnetic conductive member 36 of the electroacoustic transducer 3 shields the vent hole 301b, and the bonding region is embedded with the base 301, and the plurality of through holes 362 of the second magnetic conductive member 36 serve as a filling space for the plastic, so that the base 301 The bonding ability with the second magnetically permeable member 36 is relatively stable, so that the electroacoustic transducer 3 is less susceptible to external forces and the internal structure of the electroacoustic transducer 3 is loosened, and the acoustic performance of the electroacoustic transducer 3 is prevented from being changed.

Furthermore, when the electroacoustic transducer 3 is turned on and sounds, the plurality of perforations 362 of the damper region of the second magnetically permeable member 36 are aligned with the vent holes 301b, so that the ventilating holes 301b can be used for tuning, such that the electroacoustic transducer 3 There is no need for an additional tuning net to adhere to the base 301, so that the structure is simple and the assembly cost is reduced.

Please refer to FIG. 8 and FIG. 9 . FIG. 8 is a schematic diagram of a third embodiment of the electroacoustic transducer of the present invention. Figure 9 is an exploded view of a third embodiment of the electroacoustic transducer of the present invention. As shown in the eighth figure, the bottom of the electroacoustic transducer 4 has a pair of elastic terminals 5 for electrically connecting the electroacoustic transducer 4 to the electronic product. As shown in the ninth diagram, the electroacoustic transducer 4 includes a housing 40, a diaphragm 41, a voice coil 42, a magnetic drive unit 43, and a pair of terminals 5.

The housing 40 is made of plastic. The housing 40 is composed of a base 401 and an upper cover 402. A mounting hole 401a is defined in the center of the base 401. A vent hole 401b is defined in the periphery of the mounting hole 401a.

The magnetic driving device 43 is composed of a first magnetic conductive member 44, a magnet 45 and a second magnetic conductive member 46, and the magnetic driving device 43 is received in the mounting hole 401a of the base 401, wherein the magnetic body in the embodiment The drive unit 43 is of an internal magnetic type and can also be implemented as an external magnetic type.

The voice coil 42 is suspended from the periphery between the first magnetic conductive member 44, the second magnetic conductive member 46, and the magnet 45, and is driven by the magnetic driving device 43.

The bottom end of the diaphragm 41 is coupled to the top end of the voice coil 42, and the diaphragm 41 is interlocked with the voice coil 42.

The upper cover 402 has a sound hole 402a. The upper cover 402 is fixedly coupled to the top end of the base 401 and is spaced apart from the diaphragm 41 to cover and protect the diaphragm 41.

The terminal 5 has a fixing portion 51 and a movable portion 54. The fixing portion 51 is connected with the movable portion 54 with a turning portion 53 so that the movable portion 54 can be yawed relative to the fixing portion 51, and the fixing portion 51 has a plurality of through holes 52. There is a combination zone and a damping zone, wherein the damping zone of the fixing portion 51 is a shielding vent 401b, and the bonding zone of the unshielded vent 401b is embedded with the base 401, and the plastic of the forming base 401 is filled into the plurality of holes 52. In order to form a firm bond between the terminal 5 and the base 401.

Please refer to the tenth figure, which is the A-A cross-sectional view of the eighth figure. The damper region of the fixing portion 51 of the terminal 5 shields the vent hole 401b of the base 401, and the joint region is embedded with the base 401, and the plurality of through holes 52 serve as a filling space for the plastic, so that the bonding ability between the base 401 and the terminal 5 is quite stable. The terminal 5 can be firmly coupled to the electroacoustic transducer 4 without being easily detached, and the electrical connection effect between the electroacoustic transducer 4 and the electronic product is prevented from being lowered or disabled.

Please refer to FIG. 11 for a bottom view of a third embodiment of the electroacoustic transducer of the present invention. When the electroacoustic transducer 4 is turned on and sounds, the plurality of perforations 52 of the damper region of the fixing portion 51 are aligned with the vent holes 401b, so that it can be used as the tuning of the vent holes 401b, so that the electroacoustic transducer 4 does not need an additional tuning network. Adhering to the base 401 also has the same effect as the foregoing embodiment, which simplifies the process and reduces the cost.

In summary, the plurality of perforations of the electroacoustic transducer of the present invention can be formed on the inner magnetic or outer magnetic type magnetic conductive member or the fixed portion of the terminal to make the magnetic conductive member or the terminal and the electroacoustic transducer When the housing is buried, the magnetic conductive member and the terminal portion shield the vent hole of the housing, and the aperture of the plurality of perforations is smaller than the aperture of the vent hole, so that the plurality of perforations form a new channel for sound, thereby providing a sound airflow for discharging. The sound emitted by the electroacoustic transducer can be adjusted to obtain better acoustic performance. Therefore, the electroacoustic transducer of the present invention can eliminate the problem that the generated adhesive is easy to block the mesh when the conventional tuning network is adhered, and the assembly tuning is eliminated. The complex process of the mesh allows the present invention to reduce costs and avoid acoustic performance.

In addition, the magnetic conductive member or the terminal of the present invention is closely embedded in the housing of the electroacoustic transducer, and the plastic is filled into a part of the perforation, so that the magnetic conductive member or the terminal and the housing are buried, and a better combination effect can be obtained. The internal structure of the electroacoustic transducer is prevented from being loosened by the external force, which causes the acoustic performance to be affected.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1. . . speaker

10. . . case

10a. . . Mounting holes

10b. . . Vent

11. . . Upper cover

11a. . . Sound hole

12. . . Vibrating membrane

13. . . Voice coil

14. . . Magnetic pole piece

15. . . magnet

16. . . Next film

17. . . Tuning network

2. . . Electroacoustic converter

20. . . case

201. . . Base

201a. . . Mounting holes

201b. . . Vent

202. . . Upper cover

202a. . . Sound hole

twenty one. . . Vibrating membrane

twenty two. . . Voice coil

twenty three. . . Magnetic drive

twenty four. . . First magnetic conductive member

241. . . Housing

242. . . Wing

243. . . perforation

25. . . magnet

26. . . Second magnetic conductive member

3. . . Electroacoustic converter

30. . . case

301. . . Base

301a. . . Mounting holes

301b. . . Vent

301c. . . Stop

302. . . Upper cover

302a. . . Sound hole

31. . . Vibrating membrane

32. . . Voice coil

33. . . Magnetic drive

34. . . First magnetic conductive member

341. . . Column

342. . . Class department

35. . . magnet

36. . . Second magnetic conductive member

361. . . Bonding hole

362. . . perforation

4. . . Electroacoustic converter

40. . . case

401. . . Base

401a. . . Mounting holes

401b. . . Vent

402. . . Upper cover

402a. . . Sound hole

41. . . Vibrating membrane

42. . . Voice coil

43. . . Magnetic drive

44. . . First magnetic conductive member

45. . . magnet

46. . . Second magnetic conductive member

5. . . Terminal

51. . . Fixed part

52. . . perforation

53. . . Turning section

54. . . Activities section

The first figure is an exploded view of a conventional speaker.

The second picture is a cross-sectional view of a conventional speaker.

The third figure is an exploded view of the first embodiment of the electroacoustic transducer of the present invention.

Figure 4 is a cross-sectional view showing a first embodiment of the electroacoustic transducer of the present invention.

Figure 5 is a bottom plan view of a first embodiment of the electroacoustic transducer of the present invention.

Figure 6 is an exploded view of a second embodiment of the electroacoustic transducer of the present invention.

Figure 7 is a cross-sectional view showing a second embodiment of the electroacoustic transducer of the present invention.

The eighth figure is a schematic view of a third embodiment of the electroacoustic transducer of the present invention.

Figure 9 is an exploded view of a third embodiment of the electroacoustic transducer of the present invention.

The tenth figure is a cross-sectional view taken along line A-A of the eighth figure.

Figure 11 is a bottom plan view of a third embodiment of the electroacoustic transducer of the present invention.

2. . . Electroacoustic converter

20. . . case

201. . . Base

201a. . . Mounting holes

201b. . . Vent

202. . . Upper cover

202a. . . Sound hole

twenty one. . . Vibrating membrane

twenty two. . . Voice coil

twenty three. . . Magnetic drive

twenty four. . . First magnetic conductive member

241. . . Housing

242. . . Wing

243. . . perforation

25. . . magnet

26. . . Second magnetic conductive member

Claims (17)

An electroacoustic transducer includes: a housing having a vent hole at one end and a sound hole at the other end; a voice coil disposed in the housing; and a diaphragm coupled to the top of the voice coil And a magnetic drive device for driving the voice coil to vibrate, the magnetic drive device includes a first magnetic conductive member, a second magnetic conductive member, and a first magnetic conductive member disposed thereon a magnet between the second magnetically conductive members, the first magnetically conductive member has a bonding region and a damping region, the bonding region is embedded in a part of the housing, and the damping region has a plurality of perforations and is disposed The sound volume of the vent hole is adjusted in the path of the vibrating membrane to the vent hole. The electroacoustic transducer of claim 1, wherein the damper region of the first magnetically permeable member shields the vent hole, and the apertures of the through holes are smaller than the vent hole. The electroacoustic transducer according to claim 1, wherein the first magnetic conductive member has a receiving portion, and the peripheral portion of the receiving portion has a wing portion, and the through holes are disposed on the wing portion. The electroacoustic transducer of claim 3, wherein the housing comprises a base, the vent is disposed at the base, and has a mounting hole at a periphery of the vent for the first guide The housing of the magnetic component is mounted. The electroacoustic transducer of claim 3, wherein the magnet is disposed in the receiving portion of the first magnetically conductive member and spaced apart from the receiving portion for suspending the voice coil. The electroacoustic transducer of claim 4, wherein the housing comprises an upper cover for bonding to the top end of the base. The electroacoustic transducer according to claim 1, wherein the magnetic circuit includes a first magnetic conductive member, a second magnetic conductive member, and a first magnetic conductive member and the second magnetic conductive member. The magnet between the pieces, the joint zone and the damper zone are formed on the second magnetic conductive member, and the joint zone and the damper zone are provided with a plurality of perforations. The electroacoustic transducer according to claim 7, wherein the damper region of the second magnetic permeable member shields the vent hole, and the holes of the through holes are smaller than the vent hole. The electroacoustic transducer according to claim 7, wherein the first magnetic conductive member has a column, and the magnet ring is disposed at a periphery of the column of the first magnetic conductive member. The electroacoustic transducer of claim 7, wherein the housing has a base, and the base has a mounting hole for receiving the first magnetically permeable member. The electroacoustic transducer according to claim 9, wherein the second magnetic conductive member further comprises a coupling hole for providing the voice coil to be suspended, and the voice coil is suspended between the magnet and the column. Periphery. The electroacoustic transducer according to claim 10, wherein the housing comprises an upper cover for being fixedly coupled to the top end of the base. An electroacoustic transducer includes: a housing having a vent hole at one end and a sound hole at the other end; a voice coil disposed in the housing; and a diaphragm coupled to the top of the voice coil And can be coupled therewith; a magnetic drive device is disposed in the housing for driving the voice coil; The pair of terminals respectively have a fixing portion and a movable portion, and the movable portion is electrically connected to an external electronic product, the fixing portion has a bonding area and a damping area, and the bonding area is embedded in the housing The voice coil is partially and electrically connected, and the damper region has a plurality of perforations and is disposed on the path of the vibrating membrane to the vent hole, thereby adjusting the sound volume of the vent hole. The electroacoustic transducer according to claim 13, wherein the magnetic driving device is an inner magnetic type magnetic gas circuit. The electroacoustic transducer according to claim 13, wherein the magnetic driving device is an external magnetic magnetic circuit. The electroacoustic transducer according to claim 13, wherein the magnetic driving device comprises a first magnetic conductive member, a second magnetic conductive member, and a first magnetic conductive member and the second magnetic conductive member. The magnet between the pieces. The electroacoustic transducer according to claim 13, wherein the fixing portions of the two terminals have a plurality of through holes, and the holes of the through holes are smaller than the vent holes.