CN107454529B

CN107454529B - Electroacoustic device and mobile terminal

Info

Publication number: CN107454529B
Application number: CN201710814618.5A
Authority: CN
Inventors: 严笔祥
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-09-08
Filing date: 2017-09-08
Publication date: 2023-07-28
Anticipated expiration: 2037-09-08
Also published as: CN107454529A

Abstract

According to the electroacoustic device and the mobile terminal, the plurality of sound absorption cavities are arranged in the box body of the electroacoustic device, and the sound absorption materials are filled in the sound absorption cavities, so that the sound absorption materials filled in each sound absorption cavity can be changed in type or particle size or different filling amounts according to design requirements, and the sound absorption materials in the electroacoustic device can be flexibly combined in different types and different particle sizes or different filling amounts, and the better generating effect of the electroacoustic device can be easily realized.

Description

Electroacoustic device and mobile terminal

Technical Field

The present invention relates to the field of electronic devices, and in particular, to an electroacoustic device and a mobile terminal.

Background

At present, in order to enhance the bass effect of an electroacoustic device in a mobile terminal product, an acoustic absorption cavity is generally required to be arranged in the electroacoustic device, acoustic absorption particles are filled in the acoustic absorption cavity, and a better bass effect is obtained through the absorption effect of the acoustic absorption particles on sound waves. In the prior art, the sound absorption material is packaged, and the packaged sound absorption material is assembled in the sound cavity, so that the sound cavity is single in structure, the sound absorption effect is poor, and the user experience is low.

Disclosure of Invention

The invention provides an electroacoustic device and a mobile terminal for improving user experience.

The invention provides an electroacoustic device, which comprises a box body, an electroacoustic assembly and a plurality of net spacers, wherein the box body is provided with sound cavities, the electroacoustic assembly comprises a frame fixed in the sound cavities, a vibrating diaphragm fixed in the frame and a driving assembly, the driving assembly drives the vibrating diaphragm to vibrate, a leakage hole penetrating through the frame is formed in the frame, the net spacers divide the area outside the frame in the sound cavities into a plurality of sound absorption cavities, each sound absorption cavity is filled with sound absorption materials, and sound waves transmitted into the sound absorption cavities through the leakage hole are absorbed by the sound absorption materials in each sound absorption cavity.

The invention also provides a mobile terminal which comprises a body and the electroacoustic device, wherein the electroacoustic device is arranged in the body.

According to the electroacoustic device and the mobile terminal, the box body of the electroacoustic device is provided with the plurality of the net partition pieces to separate the sound cavity into the plurality of sound absorption cavities, and the sound absorption cavities are filled with the sound absorption particles, so that the sound absorption structure of the sound cavity is increased, the sound quality is improved, and the user experience is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional view of an electroacoustic device provided by an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the electroacoustic device provided in the embodiment shown in fig. 1;

fig. 3 is a schematic cross-sectional view of an electroacoustic device according to an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of an electroacoustic device provided by another embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of an electroacoustic device provided by another embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of an electroacoustic device provided by another embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of an electroacoustic device provided by another embodiment of the present invention;

FIG. 8 is a schematic view of a structure of a mesh separator according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of an electroacoustic device according to another embodiment of the present invention;

fig. 10 is a schematic diagram of a mobile terminal according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 and 2, the present invention provides an electroacoustic device 100, wherein the electroacoustic device 100 includes a case 10, an electroacoustic assembly 20, and a plurality of mesh spacers. The box body 10 is provided with a sound cavity, and the electroacoustic assembly 20 is arranged in the sound cavity. The electroacoustic assembly 20 comprises a frame 21 fixed in the sound cavity, a diaphragm 22 fixed to the frame 21 and a driving assembly. The driving assembly drives the vibrating diaphragm 22 to vibrate, and the frame 21 is provided with a leakage hole 211 penetrating through the frame 21. The plurality of said mesh spacers comprises at least one first mesh spacer 32 and a second mesh spacer 33. The second mesh partition 32 covers the leakage hole 211, the first mesh partition 31 partitions the sound cavity into a plurality of sound absorption cavities 30 in a region outside the electroacoustic assembly 20, and each sound absorption cavity 30 is filled with a sound absorption material 31. A part of sound waves emitted by vibration of the diaphragm 22 are transmitted into the frame 21, and are transmitted into the sound absorption chamber 30 through the leakage hole 211, and are absorbed by the sound absorption material 31 in the sound absorption chamber 30.

The case 10 includes a bottom wall 11, a top wall 12 opposite to the bottom wall 11, and a side wall 13 connecting the bottom wall 11 and the top wall 12. The case 10 may be made of plastic or metal. The top wall 12 is provided with a sound outlet, and the sound outlet may be in a strip shape, a round shape or other various shapes. In this embodiment, the case 10 is a square case. It will be appreciated that the case 10 may also be a round case or any other case.

The electroacoustic assembly 20 comprises a frame 21, a diaphragm 22 arranged in the frame 21 and a driving assembly. The frame 21 is an annular frame. It is to be understood that the frame 21 may be a circular ring frame, a square ring frame, a polygonal ring frame, or the like, that is, the shape of the frame 21 is not limited by the present invention. The frame 21 may be made of various materials such as plastic materials and metal materials. The frame 21 includes a top end and a bottom end opposite the top end. The frame 21 is positioned at an intermediate position of the case 10 such that there is a certain interval between the frame 21 and the side wall 13 of the case. The top end of the frame 21 abuts and is fixed to the top wall 12 of the box and the bottom end of the frame 21 abuts and is fixed to the bottom wall 11 of the box. The bottom wall 11, the top wall 12, the side walls 13 and the frame 21 of the box form a closed space. The frame 21 is provided with a leakage hole 211 penetrating through the frame 21, and the leakage hole 211 is communicated with the sound absorption cavity 30 and the inside of the frame 21, so that sound waves in the frame 21 can be transmitted to other positions of the sound cavity except the box body 10 through the leakage hole 211, and the sound waves can be transmitted at any position in the sound cavity. Meanwhile, the frame 21 is communicated with other positions of the sound cavity through the leakage hole 211, so that the inner cavity space of the electroacoustic device 100 is increased, and thus a better bass effect can be obtained.

The second mesh partition 33 is covered on the leakage hole 211, and the sound absorbing material 31 in the sound absorbing cavity 30 is prevented from entering the electroacoustic assembly 20 through the leakage hole 211 by the second mesh partition 33, so as to ensure the normal operation of the electroacoustic assembly 20. Specifically, in this embodiment, the second mesh partition 33 includes a frame, and the frame of the second mesh partition 33 is fixed on the frame 21 and surrounds the periphery of the leakage hole 211 to cover the leakage hole 211. In this embodiment, there are two leakage holes 211, and the two leakage holes 211 are disposed opposite to each other on two sides of the frame 21. Therefore, the sound waves can be transmitted from two sides of the frame, so that a loudspeaker space is not required to be arranged in the thickness direction of the electroacoustic assembly 20, the thickness of the electroacoustic assembly 20 can be reduced, the thickness of the electroacoustic device 100 is reduced, and the current requirement for thinning the thickness of a mobile terminal product as much as possible is met. Further, in this embodiment, the frame is a square ring structure, the frame 21 of the square ring structure includes two opposite first side walls and two opposite second side walls connected to the first side walls, the first side walls are abutted against the side walls of the box 10, and the second side walls are spaced from the side walls of the box 10. The bottom wall 11, top wall 12, side wall 13 and second side wall 214 of the frame 21 of the box are sealed.

The diaphragm 22 is provided with corrugations between the periphery and the geometric centre. The corrugations extend in the circumferential direction of the diaphragm 22. The corrugations serve to reduce the tension of the diaphragm 22, thereby making the diaphragm 22 more susceptible to deformation vibrations in regions near the geometric center. The periphery of the diaphragm 22 is fixedly connected to the frame 21 and is opposite to the bottom wall 11 of the case. The material of the diaphragm 22 may be paper, fiber, metal, wool, silk, etc. The diaphragm 22 vibrates to generate sound waves, thereby sounding the electroacoustic device 100. In the present invention, when the electroacoustic assembly 20 is disposed in the case 10, the diaphragm 22 is located at the position of the sound outlet of the case 10. By arranging the diaphragm 22 at the position of the sound outlet, sound waves emitted by the vibration of the diaphragm 22 are transmitted from the position of the sound outlet, so that the sound of the electroacoustic device 100 can be transmitted. And, the said vibrating diaphragm 22 covers and seals the said sound hole towards one side of the said box body 10 inside, thus make the said box body 10 form the seal structure, thus guarantee the sound production of the said electroacoustic device.

The drive assembly comprises a first drive assembly 23 and a second drive assembly 24. The first driving component 23 is fixed on the diaphragm 22, and the second driving component 24 is fixed on the bottom wall 11 of the case 10. The first driving member 23 may vibrate with respect to the second driving member 24 to drive the diaphragm 22 to vibrate so as to emit sound waves. Referring to fig. 3, in this embodiment, the first driving member 23 is a coil, the second driving member 24 is a magnet, and preferably, the second driving member is a permanent magnet. And, the second driving member 24 includes a first driving portion 241 and a second driving portion 242, and the first driving portion 241 is disposed around the second driving portion 242 at a distance from the second driving portion 242. In this embodiment, the first driving portion 241 is disposed closely to the frame 21. The first driving part 241 is provided with a through hole which is opposite to and communicates with the leakage hole 211 of the frame 21. Thereby ensuring that the leakage hole 211 is not blocked by the first driving part 241. Referring to fig. 4, in another embodiment of the present invention, the first driving portion 241 is spaced from the frame 21, and no through hole is provided in the first driving portion 241. Thereby ensuring that the leakage hole 211 is not blocked and at the same time ensuring the integrity of the first driving part 241, the driving assembly generates a better driving effect. The first driver 23 is located between the first driving portion 241 and the second driving portion 242. And, the axial direction of the first driving member 23 is perpendicular to the plane of the diaphragm 22. By introducing an electrical signal to the first driving member 23, the constant magnetic fields generated by the first driving member 23 and the second driving member 24 generate electromagnetic force, so that the first driving member 23 vibrates in the axial direction under the action of the second driving member 24, and the vibrating diaphragm 22 is driven to vibrate in the direction approximately perpendicular to the plane of the vibrating diaphragm 22 to emit sound waves. Referring to fig. 5, in other embodiments of the present invention, the first driving member 23 may be a magnet, and the second driving member 24 may be a coil.

Referring to fig. 1 and 2 again, the bottom wall 11, the bottom wall 12, the side walls 13 and the frame 21 of the box 10 are hermetically formed. And, the space where the sound absorption cavity 30 is located is other space except the electroacoustic self-test 20 in the sound cavity of the box body 10. In this embodiment, the space where the sound absorbing cavity 30 is located is a region between the side wall 13 and the frame 21. The leakage hole 211 penetrates through the frame 21 and communicates the frame 21 with each of the sound absorption cavities 30, and a part of sound waves emitted by the diaphragm 22 enter each of the sound absorption cavities 30 through the leakage hole 211. Each of the sound absorption cavities 30 is filled with a sound absorption material 31, and in this embodiment, the sound absorption material 31 is a sound absorption particle. In this embodiment, the first mesh spacer is disposed along the direction from the frame 21 to the inner sidewall 13 of the box body, so that the sound absorbing cavity 30 is disposed along the direction from the frame 21 to the inner sidewall 13 of the box body. Further, in this embodiment, the first mesh partition 31 is a flat mesh partition, and the first mesh partition 32 is perpendicular to the bottom wall 11 and is disposed in parallel, so that the plurality of sound absorbing cavities 30 are disposed in parallel along the direction from the frame 21 to the inner sidewall 13 of the box body. Further, the particle size of the sound absorbing material in one of the sound absorbing chambers 30 closest to the frame 21 in this embodiment is larger than the particle sizes of the sound absorbing materials in the other sound absorbing chambers 30. And the particle size of the sound absorbing material in the sound absorbing cavity is gradually reduced along the direction from the frame 21 to the inner side wall 13 of the box body. The particle size of the sound absorbing material in the sound absorbing chamber 30 of each layer in the direction of sealing the frame 21 to the case is gradually reduced.

The second mesh partition 32 covers the leakage hole 211, the first mesh partition 31 partitions the sound cavity into a plurality of sound absorption cavities 30 in a region outside the electroacoustic assembly 20, and each sound absorption cavity 30 is filled with a sound absorption material 31. The first mesh partition 32 and the second mesh partition 33 are provided with a plurality of meshes arranged in an array. Wherein the mesh size of the second mesh partition 33 is slightly smaller than the particle size of the sound absorbing material in the layer 31 closest thereto, thereby preventing the sound absorbing material from entering the inside of the frame 21 by passing through the mesh of the second mesh partition 33. The mesh holes on the first mesh partition 32 are slightly smaller than the particle size of the sound absorbing material in the sound absorbing cavity 30 on the side facing away from the electroacoustic assembly 20, so that the mixing of the sound absorbing materials with different particle sizes on the two sides of the first mesh partition 32 is prevented, and the problem that the sound absorbing material with small particles passes through the second mesh partition 33 and enters the electroacoustic assembly 20 is avoided. In the present invention, the mesh size of the second mesh partition 33 is larger than the mesh size of the first mesh partition 31, and the mesh size of the first mesh partition 31 in the direction from the frame 21 to the side wall 13 of the case is gradually reduced, so that mixing of particles with different particle diameters in the sound absorbing material 31 of each layer is avoided, and further the possibility that the sound absorbing material enters the electroacoustic assembly 20 is avoided. Referring to fig. 6, in the embodiment of the present invention, by disposing the plurality of sound absorbing material layers 31 with different sound absorbing material particle sizes in the sound absorbing cavity 30 and maximizing the particle size of a layer of the sound absorbing material near the leakage hole 211, the mesh area of the second mesh partition 33 disposed on the leakage hole 211 can be larger, so as to reduce the acoustic resistance of the second mesh partition 33 to the sound wave transmitted from the leakage hole 211 while preventing the sound absorbing material from entering the electroacoustic assembly 20, and improve the generating effect of the electroacoustic device 100. Referring to fig. 7, the materials of the sound absorbing materials in the two adjacent sound absorbing cavities 30 may also be different. That is, the sound absorbing material 31 of different materials, different particle diameters or different shapes can be filled in the sound absorbing cavity 30 as required to achieve the best generation effect. In this embodiment, the sound absorbing material is a lightweight porous sound absorbing particle, which may be foam balls, activated carbon, zeolite, or the like. Further, according to practical needs, the volumes of the sound absorbing cavities 30 may be set to be the same or different, so as to control the amount of the sound absorbing material 31 in each sound absorbing cavity 30, and further enable the sound generating device 100 to achieve the best sound generating effect.

The first mesh spacer 32 and the second mesh spacer 33 may be mesh cloth, plastic partition board, metal partition board, or the like, which is provided with an array of meshes. Referring to fig. 8, in an embodiment of the present invention, each of the first mesh spacer 32 and the second mesh spacer 33 includes a frame 331 and a plurality of parallel warp threads 332 fixed on the frame 331, the adjacent two parallel warp threads 332 and the frame 331 form the mesh, and the distance between the adjacent two parallel warp threads 332 is smaller than the particle size of the sound absorbing material 31, so as to prevent the sound absorbing material 31 from passing through the first mesh spacer 32 and the second mesh spacer 33, and increase the area of the mesh as much as possible, thereby reducing the acoustic resistance of the sound wave transmitted from the leakage hole 211 by the first mesh spacer 32 and the second mesh spacer 33, and improving the generating effect of the electroacoustic device 100. In this embodiment, the warp threads 332 of the first mesh spacer 32 and the second mesh spacer 33 in the electroacoustic device 100 have the same direction, so that the propagation of the sound wave and the circulation of the air in each sound absorption cavity 30 are smoother, and the generating effect of the electroacoustic device 100 is further improved.

In this embodiment, two layers of the sound absorbing material layers 31 are disposed in the sound absorbing cavity 30, and a first mesh spacer 32 is disposed between the two layers of the sound absorbing material 31. The particle size of one layer of the sound absorbing material 31 of the first mesh partition 32 facing one side of the electroacoustic assembly 20 is larger than the particle size of one layer of the sound absorbing material 31 of the other side. The mesh size on the second mesh separator 33 is smaller than the particle size of the layer of sound absorbing material 31 adjacent thereto, and the mesh size on the second mesh separator is larger than the mesh size on the first mesh separator 32. In this embodiment, the first mesh spacer 32 and the second mesh spacer 33 are mesh fabrics. It is understood that the first mesh spacer 32 and the second mesh spacer 33 may be other mesh spacers having meshes, such as a metal grid or a plastic grid. When the electroacoustic device 100 operates, the diaphragm 22 vibrates to generate sound waves, and part of the sound waves propagate into the frame 21, and the part of the sound waves enter the sound absorption cavities 30 through the leakage holes 211. The sound absorbing material in each of the sound absorbing chambers 30 converts mechanical energy of the sound wave into heat, thereby absorbing the partial sound wave, thereby preventing the influence of the partial sound wave propagating in the frame 21 on the vibration of the diaphragm 22, and thus obtaining a good sound emitting effect. The more the amount of sound absorbing material filled in each sound absorbing cavity 30, the greater the resistance of the sound absorbing material when the sound wave is transmitted, so that more energy is converted into heat energy, i.e. a better sound absorbing effect can be achieved, and a better sound emitting effect can be obtained. In this embodiment, the particle size of the sound absorbing material of the sound absorbing cavity 30 near the air outlet 211 is larger, so that the mesh of the second mesh compartment 33 is larger, and the acoustic resistance of the second mesh compartment 33 is reduced. And the particle size of the sound absorbing material of the sound absorbing cavity 30 far from the leakage hole 211 is smaller, so that the filling amount of the sound absorbing material in the sound absorbing cavity 30 can be increased to obtain better bass effect.

Referring to fig. 9, in another embodiment of the present invention, the number of the leakage holes 211 is plural, and the leakage holes 211 are spaced along the circumferential direction of the frame 21, so as to increase the area of the leakage holes 211 and reduce the acoustic resistance of the frame to the electroacoustic assembly 20.

In the present embodiment, the second mesh member 33 covers the peripheral side of the frame 21, so that the plurality of leakage holes 211 in the frame 21 are covered by one mesh member 33. A plurality of the sound absorbing chambers 30 are disposed around the electroacoustic assembly 20, and each of the leakage holes 211 communicates with the sound absorbing chambers 30 and the inside of the frame 21. By disposing the sound absorbing chamber 30 around the electroacoustic assembly 20, the size of the sound absorbing chamber 30 is increased, thereby increasing the amount of sound absorbing material filled in the sound absorbing chamber 30, and thus enabling a better bass effect.

In the electroacoustic device 100 provided by the invention, the second net spacer 33 is covered on the leakage hole 211, so that the sound absorbing material is prevented from entering the leakage hole 22, and the sound production of the electroacoustic assembly 20 is ensured. And, a plurality of sound absorption cavities 30 are arranged from the frame 21 of the electroacoustic assembly to the side wall 13 of the box body, and sound absorption materials 31 are filled in each sound absorption cavity 30, so that the sound absorption materials are uniformly arranged at the positions of other sound cavities except for the electroacoustic assembly 20, and a better sound absorption effect of the sound absorption materials is realized. And the type or particle size or different filling amounts of the sound absorbing material 31 filled in each sound absorbing cavity 30 can be changed according to design requirements, so that the sound absorbing material 31 in the electroacoustic device 100 can be flexibly combined with different types and different particle sizes or different filling amounts, and the electroacoustic device 100 can easily achieve better generating effects. Further, by changing the kind of the sound absorbing material in each sound absorbing cavity 30, the sound absorbing cavity 30 has a better sound absorbing effect, and an electroacoustic device with a better sound producing effect can be obtained. And the particle diameter of the sound absorbing material layer 31 closest to the frame 21 is maximized so that the mesh size of the second mesh partition 33 can be set larger, thereby reducing the obstruction of sound waves by the second mesh partition 33. Further, since the particle size of the sound absorbing material 31 in the sound absorbing chamber 30 far from the frame 31 is small, the filling rate of the sound absorbing material filled in the sound absorbing chamber 30 can be high, and thus a good bass effect can be obtained. The electroacoustic device can ensure the volume of sound production of the electroacoustic device under the condition of better bass effect, thereby obtaining better sound production effect.

Referring to fig. 10, the present invention further provides a mobile terminal 200, where the mobile terminal 200 includes a body and the electroacoustic device 100 disposed on the body. The body includes a housing 90 and a main board 91 fixed in the housing 90. The electroacoustic device 100 is fixed to the bottom end of the housing 90. The first driving member 23 of the electroacoustic assembly 100 is electrically connected to the main board 91, and receives a current signal of the main board 91, so as to drive the diaphragm 22 to vibrate under the action of the second driving member 24, thereby making the electroacoustic assembly 100 produce sound. It is understood that the mobile terminal 200 may be a mobile phone, a tablet computer, a notebook computer, etc.

The foregoing is a description of embodiments of the present invention, and it should be noted that, for those skilled in the art, modifications and variations can be made without departing from the principles of the embodiments of the present invention, and such modifications and variations are also considered to be within the scope of the present invention.

Claims

1. The electroacoustic device is characterized by comprising a box body, an electroacoustic assembly and a plurality of net spacers, wherein the box body is provided with a sound cavity, the electroacoustic assembly comprises a frame fixed in the sound cavity, a vibrating diaphragm fixed in the frame and a driving assembly, the driving assembly drives the vibrating diaphragm to vibrate, a leakage hole penetrating through the frame is formed in the frame, the net spacers comprise at least one first net spacer and a second net spacer, the second net spacer is close to the frame, the first net spacer is far away from the frame relative to the second net spacer, the second net spacer covers the leakage hole, the first net spacer separates the sound cavity into a plurality of sound absorption cavities in an area outside the frame, each sound absorption cavity is filled with sound absorption materials, sound absorption materials in each sound absorption cavity absorb sound waves which are transmitted to the sound absorption cavities through the leakage hole, the first net spacer is close to the frame, the second net spacer is arranged in the direction from the inner side wall of the box body, the second net spacer is smaller than the second net spacer, and the second net spacer is arranged in the same in the direction, and the size of the second net spacer is smaller than the second net spacer.

2. The electroacoustic device of claim 1 wherein the particle size of the sound absorbing material in one of said sound absorbing chambers closest to said frame is larger than the particle size of the sound absorbing material in the other of said sound absorbing chambers.

3. The electroacoustic device of claim 1 wherein said first screen is disposed along an interior wall of said frame to said case.

4. An electroacoustic device according to any one of claims 1 to 3 wherein the volumes of the plurality of sound absorbing chambers are different.

5. The electroacoustic device of claim 1 wherein each of said mesh spacers comprises a frame and a plurality of parallel warp threads fixed to said frame, adjacent two parallel warp threads and the frame forming a mesh, the distance between adjacent two parallel warp threads being less than the particle size of said sound absorbing material.

6. The electroacoustic device of claim 5 wherein the warp direction of each of said webs is the same.

7. The electroacoustic device of claim 1 wherein said housing has a bottom wall, a top wall opposite said bottom wall, and a side wall connecting said bottom wall and said top wall, said frame being secured to said bottom wall, and said diaphragm being secured to said frame opposite said bottom wall.

8. The electroacoustic device of claim 7 wherein said top wall of said housing is provided with an acoustic aperture, said diaphragm sealing said acoustic aperture.

9. The electroacoustic device of claim 7 wherein said mesh spacer is a planar mesh spacer, said mesh spacer being disposed perpendicularly to said bottom wall and parallel thereto, a plurality of said mesh spacers being disposed in parallel to a plurality of sound absorbing chambers resulting from the separation of regions other than said electroacoustic assembly.

10. The electroacoustic device of claim 7 wherein said drive assembly comprises a first drive member and a second drive member, said first drive member being secured to said diaphragm and said second drive member being secured to said bottom wall, said first drive member vibrating relative to said second drive member to vibrate said diaphragm to produce sound waves.

11. The electroacoustic device of claim 10 wherein said second driver comprises a first driver portion and said second driver portion, said first driver portion being spaced around said second driver portion, said first driver being positioned between said first driver portion and said second driver portion of said second driver.

12. The electroacoustic device of claim 10 wherein said first drive section is positioned against said frame.

13. The electroacoustic device of claim 12 wherein said first drive section is provided with a through hole opposite and communicating with a leakage hole in said frame.

14. The electroacoustic device of claim 10 wherein said first drive member is a magnet and said second drive member is a coil.

15. The electroacoustic device of claim 1 wherein the number of said leakage holes is plural, a plurality of said leakage holes being spaced apart along the circumference of said frame.

16. The electroacoustic device of claim 15 wherein said second screen covers a peripheral side of said frame to cover a plurality of said leakage holes.

17. The electroacoustic device of claim 15 wherein a plurality of said sound absorbing chambers are disposed around said electroacoustic assembly.

18. A mobile terminal, characterized in that the mobile terminal comprises a body and the electroacoustic device of any of claims 1 to 17, wherein the electroacoustic device is arranged in the body.