CN107809707B

CN107809707B - Electroacoustic component and mobile terminal

Info

Publication number: CN107809707B
Application number: CN201711240638.2A
Authority: CN
Inventors: 吴连俊
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-11-30
Filing date: 2017-11-30
Publication date: 2020-03-03
Anticipated expiration: 2037-11-30
Also published as: CN107809707A

Abstract

The invention discloses an electroacoustic assembly, comprising: a circuit board provided with a receiving groove; the loudspeaker single body is accommodated in the accommodating groove and comprises an inner frame and a vibrating diaphragm, the periphery of the vibrating diaphragm is fixedly connected to the inner frame, a sounding cavity is formed between the inner frame and the vibrating diaphragm, and the sounding cavity is used for sounding; the apron, the lid fits the opening part of accepting groove, the inner wall of accepting groove includes diapire and lateral wall, the apron is in the vertical projection of diapire is located the lateral wall with between the internal frame, the apron the internal frame the diapire reaches form the back sound chamber between the lateral wall, the internal frame is equipped with leakage hole intercommunication the sounding chamber with the back sound chamber. The invention also discloses a mobile terminal. The whole thickness of the electroacoustic component is reduced, the sound production effect of the electroacoustic component is not influenced, the light and thin design of a product is facilitated, and the user experience is optimized.

Description

Electroacoustic component and mobile terminal

Technical Field

The invention relates to the technical field of electronic equipment, in particular to an electroacoustic component and a mobile terminal.

Background

With the application of mobile terminal products becoming more and more widespread, users increasingly prefer a light and thin mobile terminal design, and the thickness requirement of the electroacoustic component is also becoming higher and higher as the electroacoustic component is an indispensable part of the mobile terminal. The electro-acoustic assembly of moving coil formula at present all designs the leakage hole in the bottom of electro-acoustic assembly, and electro-acoustic assembly includes vocal chamber and back sound chamber that communicate each other, and the thickness of vocal chamber, the thickness of back sound chamber and the connected mode of vocal chamber and back sound chamber are all direct influence the thickness of electro-acoustic assembly.

Among the prior art, electroacoustic component has independent box body structure in order to form the sound chamber, and electroacoustic component assembles on the circuit board that is equipped with drive circuit, and the thickness of circuit board has increased the whole space that occupies of electroacoustic component in the thickness direction, leads to electroacoustic component's thickness size big, is unfavorable for the frivolous design of product, influences user experience.

Disclosure of Invention

The invention aims to provide an electroacoustic component and a mobile terminal, and aims to solve the problem that the thickness and the size of the electroacoustic component are large and user experience is influenced in the prior art.

To solve the above technical problem, the present invention provides an electroacoustic assembly, comprising:

a circuit board provided with a receiving groove;

the loudspeaker single body is accommodated in the accommodating groove and comprises an inner frame and a vibrating diaphragm, the periphery of the vibrating diaphragm is fixedly connected to the inner frame, a sounding cavity is formed between the inner frame and the vibrating diaphragm, and the sounding cavity is used for sounding;

the apron, the lid fits the opening part of accepting groove, the inner wall of accepting groove includes diapire and lateral wall, the apron is in the vertical projection of diapire is located the lateral wall with between the internal frame, the apron the internal frame the diapire reaches form the back sound chamber between the lateral wall, the internal frame is equipped with leakage hole intercommunication the sounding chamber with the back sound chamber.

In one embodiment, the inner frame is fixed to the bottom wall.

In one embodiment, the inner frame comprises a first surface facing away from the bottom wall, the first surface being flush with the top surface of the cover plate.

In one embodiment, the speaker unit further includes a first driving member and a second driving member, the first driving member and the second driving member are accommodated in the sound-generating cavity, the first driving member is fixed on the bottom wall or on the inner frame, the second driving member is fixed on the vibrating diaphragm, and the second driving member is used for being opposite to the first driving member to vibrate so as to drive the vibrating diaphragm to generate sound through vibration.

In one embodiment, the first driving member is a magnet, the second driving member is a coil, the first driving member includes a first magnet and a second magnet, the first magnet is fixed on the inner frame, the second magnet is fixed on the bottom wall, the second driving member is located between the first magnet and the second magnet, the second driving member is electrically connected to the circuit board, and the circuit board is provided with a driving circuit for driving the second driving member to vibrate.

In one embodiment, the perpendicular projection of the first magnet on the inner frame is offset from the leakage hole.

In one embodiment, the leakage holes include a first leakage hole and a second leakage hole, the first leakage hole is located between the vertical projection of the first magnet on the inner frame and the diaphragm, and the second leakage hole is located between the vertical projection of the first magnet on the inner frame and the bottom wall.

In one embodiment, the electroacoustic component further comprises sound absorption particles, and the sound absorption particles are filled in the rear sound cavity.

In one embodiment, the electroacoustic assembly further comprises a screen, the screen is disposed in the rear sound cavity, the screen is fixed on the inner frame, and the screen covers the leakage hole.

The invention also provides a mobile terminal comprising the electroacoustic component.

The invention has the following beneficial effects: the speaker monomer is acceptd in the accepting groove of circuit board, has reduced the whole thickness size of speaker monomer and circuit board, and the circuit board is equipped with drive circuit on the one hand and is used for driving the speaker monomer to take place, and self is as forming the partly of back tone chamber structure on the one hand, and the circuit board has saved the bottom plate isotructure of enclosing into the back tone chamber, has reduced electroacoustic component's whole thickness, and does not influence the effect of electroacoustic component sound production, is favorable to the frivolous design of product, optimizes user experience.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other obvious modifications can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of an electroacoustic component according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a speaker unit of an electroacoustic assembly according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a back sound cavity of an electroacoustic assembly according to an embodiment of the present invention.

Fig. 4 is an enlarged partial cross-sectional view of an electro-acoustic assembly according to an embodiment.

Fig. 5 is a schematic structural diagram of an electroacoustic component according to a second embodiment of the present invention.

Fig. 6 is a schematic diagram of a speaker unit of an electroacoustic assembly according to a second embodiment of the present invention.

Fig. 7 is a schematic diagram of a back sound cavity of an electroacoustic assembly according to a second embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, 2 and 3, an electroacoustic assembly 100 according to an embodiment of the present invention includes a circuit board 10 and a speaker unit 20. Specifically, the Circuit Board 10 is a Printed Circuit Board (PCB), in one embodiment, the Circuit Board 10 may also be a Flexible Printed Circuit (FPC), and a driving Circuit is disposed on the Circuit Board 10 and is configured to drive the speaker unit 20 to generate sound. In one embodiment, when the electro-acoustic assembly 100 is applied to the mobile terminal 200, the circuit board 10 may be a main board of the mobile terminal 200. In this embodiment, specifically referring to fig. 2, the circuit board 10 is provided with a receiving groove 12, specifically, the receiving groove 12 is a groove opened on the surface of the circuit board 10, in one embodiment, the depth of the receiving groove 12 is equal to the thickness of the speaker unit 20, so that the speaker unit 20 can be received in the receiving groove 12, of course, in other embodiments, the depth of the receiving groove 12 may be smaller than the thickness of the speaker unit 20, so that the speaker unit 20 is partially received in the receiving groove 12. In this embodiment, the receiving groove 12 includes a bottom wall 102 and a side wall 104, wherein the bottom wall 102 is a bottom surface of the receiving groove 12, i.e. a plane with the largest depth of the receiving groove 12, and the side wall 104 is a peripheral surface connecting the bottom wall 102 and an opening of the receiving groove 12.

Specifically referring to fig. 2, the speaker unit 20 is accommodated in the accommodating groove 12, the speaker unit 20 includes an inner frame 22 and a diaphragm 24, a periphery of the diaphragm 24 is fixedly connected to the inner frame 22, a sound-generating cavity 1000 is formed between the inner frame 22 and the diaphragm 24, and the sound-generating cavity 1000 is used for generating sound. In one embodiment, the inner frame 22 is secured to the bottom wall 102. Specifically, the inner frame 22 is fixed to the bottom wall 102 by welding or the like, the inner frame 22 has certain strength, and the inner frame 22 may be a plastic member or a metal member. The inner frame 22 is formed into a closed figure by surrounding the vertical projection of the bottom wall 102, and it can also be understood that the inner frame 22 is formed into a hollow cylinder by surrounding, one end of the cylinder is fixedly connected with the circuit board 10 (the bottom wall 102), and the other end of the cylinder is fixedly connected with the vibrating diaphragm 24, in other words, the openings at the two ends of the cylinder (the inner frame 22) are respectively sealed by the circuit board 10 and the vibrating diaphragm 24, so as to form the sound-emitting cavity 1000 in the hollow interior of the cylinder. In this embodiment, the speaker unit 20 further includes a driving element, the driving element is accommodated in the sound-generating chamber 1000, and the driving circuit on the circuit board 10 can control the driving element to move, so as to cause the diaphragm 24 to vibrate, i.e., to generate sound, and the vibration of the diaphragm 24 causes the air around the diaphragm 24 to vibrate, so as to cause the sound to be spread outwards. Furthermore, the frequency, amplitude, etc. of the vibration of the diaphragm 24 are changed according to the driving circuit of the circuit board 10, so that the speaker unit 20 emits different sounds.

Referring to fig. 1 and 3, the electroacoustic assembly 100 further includes a cover plate 32, the cover plate 32 covers the opening of the receiving cavity 12, the inner wall of the receiving cavity 12 includes a bottom wall 102 and a side wall 104, a vertical projection of the cover plate 32 on the bottom wall 102 is located between the side wall 104 and the inner frame 22, a rear sound cavity 2000 is formed between the cover plate 32, the inner frame 22, the bottom wall 102 and the side wall 104, and the inner frame 22 is provided with a leakage hole 40 to communicate the sounding cavity 1000 and the rear sound cavity 2000. Referring to fig. 3 in particular, a gap exists between the inner frame 22 and the side walls 104, the cover plate 32 covers the opening of the receiving groove 12 and covers the gap between the inner frame 22 and the side walls 104, in other words, the cover plate 32, the inner frame 22, the bottom wall 102 and the side walls 104 are connected in sequence, thereby forming a rear sound cavity 2000 around the inner frame. In one embodiment, the cover plate 32 is annular to correspond with the annular gap between the sidewall 104 and the inner frame 22. In this embodiment, the diaphragm 24 abuts against the inner ring of the cover plate 32, and the distance from the sidewall 104 to the inner frame 22 is greater than the distance from the bottom wall 102 to the cover plate 32, so that the back sound cavity 2000 is formed at the side of the speaker unit 20, thereby reducing the thickness dimension of the electroacoustic component 100 and facilitating the light and thin design of the mobile terminal 200.

Referring to fig. 1, in the present embodiment, the speaker unit 20 is configured to vibrate to emit sound waves, so as to form sound, the vibration of the speaker unit 20 causes the vibration of air or gas in the sound-emitting cavity 1000, the speaker unit 20 is disposed in the accommodating groove 12, a back sound cavity 2000 is formed between the speaker unit 20 and the side wall 104, the back sound cavity 2000 is filled with the sound-absorbing particles 74, the leakage holes 40 enable the back sound cavity 2000 to communicate with the sound-emitting cavity 1000 inside the speaker unit 20, the screen 50 is disposed in the back sound cavity 2000 to prevent the sound-absorbing particles 74 from entering the leakage holes 40, a vertical projection of the screen 50 on the speaker unit 20 covers the leakage holes 40, and a size of the screen 50 is larger than a size of the leakage holes. The leakage hole 40 is communicated with the sounding cavity 1000 and the rear sound cavity 2000, and when the loudspeaker unit 20 works, the gas in the sounding cavity 1000 is vibrated to be compressed or stretched; when gas is compressed, the gas enters the rear sound cavity 2000 from the sound production cavity 1000 through the leakage hole 40 and causes the sound absorption particles 74 in the rear sound cavity 2000 to vibrate, and the friction among the sound absorption particles 74 consumes the energy of sound waves, so that the vibration effect of the gas is changed, and the characteristics of the sound waves are changed; when the gas is stretched, the gas enters the sound-generating chamber 1000 from the back sound chamber 2000 through the leakage holes 40 and affects the characteristics of the sound waves propagated outward by the diaphragm 24, thereby optimizing the sound quality of the sound generated by the electroacoustic assembly 100.

The speaker monomer 20 is acceptd in the accepting groove 12 of circuit board 10, the whole thickness size of speaker monomer 20 and circuit board 10 has been reduced, circuit board 10 is equipped with drive circuit on the one hand and is used for driving speaker monomer 20 to take place, on the one hand self is as forming a part of back sound chamber 2000 structure, circuit board 10 has saved and has enclosed into structures such as bottom plate in back sound chamber 2000, the whole thickness of electroacoustic component 100 has been reduced, and the effect that electroacoustic component 100 sounded is not influenced, be favorable to the frivolous design of product, optimize user experience.

Referring to fig. 1, in the present embodiment, the inner frame 22 includes a first surface 221 facing away from the bottom wall 102, and the first surface 221 is flush with the top surface of the cover plate 32. Specifically, the first surface 221 is a top surface of the inner frame 22 in the thickness direction of the speaker unit 20. The speaker units 20 are all accommodated in the accommodating grooves 12, the thickness of the speaker units 20 is fused with the thickness of the circuit board 10, and the thickness of the circuit board 10 is smaller than the sum of the thicknesses of the circuit board 10 and the speaker, so that the thickness dimension of the electroacoustic component 100 is greatly reduced.

Referring to fig. 1 and fig. 2, the driving members include a first driving member 262 and a second driving member 264, the first driving member 262 is fixed on the bottom wall 102 or the inner frame 22, the second driving member 264 is fixed on the diaphragm 24, and the second driving member 264 is configured to vibrate relative to the first driving member 262 to drive the diaphragm 24 to vibrate and generate sound. Specifically, the first driving member 262 and the second driving member are driven by a driving circuit on the circuit board 10 to move relatively, the first driving member 262 is fixed on the bottom wall 102 or the inner frame 22 by welding or fastening, and the second driving member 264 is fixed on the diaphragm 24 by welding or fastening, and when the first driving member 262 moves relative to the second driving member 264, the diaphragm 24 vibrates relative to the circuit board 10 and the inner frame 22, that is, the diaphragm 24 sounds. The circuit board 10 is fixedly connected with the inner frame 22, and the circuit board 10 forms a part of the speaker unit 20, so that the circuit board is used for electrical driving, and the whole structural thickness of the speaker unit 20 is saved.

Referring to fig. 2, in the present embodiment, the first driving member 262 is a magnet, the second driving member 264 is a coil, the first driving member 262 includes a first magnet 262a and a second magnet 262b, the first magnet 262a is fixed on the inner frame 22, the second magnet 262b is fixed on the bottom wall 102, the second driving member 264 is located between the first magnet 262a and the second magnet 262b, the second driving member 264 is electrically connected to the circuit board 10, and the circuit board 10 is provided with a driving circuit for driving the second driving member 264 to vibrate. Specifically, the first magnet 262a and the second magnet 262b are permanent magnets, a stable magnetic field with a constant magnetic field direction is formed between the first magnet 262a and the second magnet 262b, the coil is located in the magnetic field formed between the first magnet 262a and the second magnet 262b, and when the driving circuit of the circuit board 10 outputs a changing current signal to the coil, the changing current in the coil causes the coil to receive a force in the magnetic field, so that the coil drives the diaphragm 24 to vibrate together. In this embodiment, the first magnet 262a is fixed to the inner frame 22, the second magnet 262b is positioned inside the first magnet 262a, and a space is provided between the first magnet 262a and the second magnet 262b to place the coil. In one embodiment, the first magnet 262a and the second magnet 262b may also be electromagnets, i.e., the magnetic force of the first magnet 262a and the second magnet 262b varies according to the magnitude of the current flowing through the first magnet 262a and the second magnet 262b, so that the coil or the diaphragm 24 vibrates relative to the first driving member 262 by changing the direction and magnitude of the magnetic field of the first magnet 262a and the second magnet 262 b.

Referring to fig. 1 and 2, in one embodiment, diaphragm 24 is provided with corrugations 72 between the periphery and the geometric center. The corrugations 72 extend in the circumferential direction of the diaphragm 24. Corrugations 72 reduce the tension of diaphragm 24, thereby making diaphragm 24 more susceptible to deforming vibrations in regions near the geometric center. The folds 72 are fixedly connected to the second driving member 264, so that the second driving member 264 can drive the diaphragm 24 to deform. The material of the diaphragm 24 may be paper, fiber material, metal material, wool material, silk material, etc.

Referring to fig. 1 and 3, in the present embodiment, the vertical projection of the first magnet 262a on the inner frame 22 is staggered from the leakage hole 40. In one embodiment, the leakage hole 40 may be a circular hole, a square hole, or the like. The leakage hole 40 is opened on the inner frame 22, in other words, the space around the leakage hole 40 is communicated without occupying the thickness dimension of the electroacoustic component 100, the sounding cavity 1000 can be communicated with the rear sound cavity 2000, the first magnet 262a is fixed on the inner frame 22 and staggered with the leakage hole 40, the flowing path of gas is not shielded, the light and thin design of the product is facilitated, and the user experience is improved.

Referring to fig. 1, in the present embodiment, the electroacoustic assembly 100 further includes sound absorbing particles 74, and the sound absorbing particles 74 are filled in the back sound cavity 2000. The electroacoustic assembly 100 further comprises a screen 50, the screen 50 being disposed in the rear sound chamber 2000, the screen 50 being fixed to the inner frame 22, and the screen 50 covering the weep hole 40. In one embodiment, the screen 50 is a gauze. The inner frame 22 includes an outer wall 220 facing the rear sound cavity 2000, and the gauze may be an opening in the outer wall 220 covering the leakage hole 40. The screen 50 covers the leakage hole 40 to prevent the sound-absorbing particles 74 from entering the sound-generating chamber 1000 and affecting the sound generation of the speaker unit 20. The screen 50 covers the leakage holes 40, so that the sound-absorbing particles 74 can be completely filled in the rear sound cavity 2000 without being packaged firstly and then placed in the rear sound cavity 2000, thereby improving the sound quality of the electroacoustic component 100 and reducing the production cost of the electroacoustic component 100.

Referring to fig. 4, in one embodiment, a support rod 400 is disposed in the leaking hole 40, the screen 50 is attached to the support rod 400, and the support rod 400 is used to reinforce the connection between the screen 50 and the outer wall 220. Specifically, the support rod 400 assists in supporting the screen 50, the support rod 400 and the sound-absorbing particles 74 are respectively located at two opposite sides of the screen 50, the sound-absorbing particles 74 generate an extrusion force on the screen 50 due to self gravity or product shaking, if the extrusion force is too large, the screen 50 falls off from the outer wall surface 220, the support rod 400 provides a support force for the screen 50 from one side of the screen 50 departing from the sound-absorbing particles 74, the screen 50 is prevented from being deformed and falling off, the maintenance period of the product is shortened, and the maintenance cost of the product is reduced. In one embodiment, the number of the support rods 400 is two, and the support rods are arranged to cross each other.

Referring to fig. 5, 6 and 7, a difference between the electroacoustic component 100 according to the second embodiment of the present invention and the first embodiment is that the leakage hole 40 includes a first leakage hole 42 and a second leakage hole 44, the first leakage hole 42 is located between the vertical projection of the first magnet 262a and the diaphragm 24, and the second leakage hole 44 is located between the vertical projection of the first magnet 262a and the bottom wall 102 of the inner frame 22. Two leakage holes 40 can increase the gas exchange rate between vocal cavity 1000 and back sound chamber 2000 to promote the tone quality effect, further, first leakage hole 42 and second leakage hole 44's cooperation is used and can be followed the different positions intercommunication vocal cavity 1000 and back sound chamber 2000 of vocal cavity 1000, compares in only from a position intercommunication vocal cavity 1000 and back sound chamber 2000, more is favorable to the gas exchange of vocal cavity 1000 and back sound chamber 2000.

Specifically to fig. 7, the first magnet 262a includes a first side wall 2622 facing the diaphragm 24, the inner wall of the first leakage hole 42 is flush with the first side wall 2622, thereby maximizing the size of the first leakage hole 42, the first leakage hole 42 is located between the vertical projections of the diaphragm 24 and the first magnet 262a and the inner frame 22, on the premise of not affecting the strength of the inner frame 22, increasing the size of the first leakage hole 42 is beneficial to increasing the amount of gas passing in and out of the back tone cavity 2000 and the sound generating cavity 1000 per unit time, i.e. the rate of gas passing in and out of the back tone cavity 2000 and the sound generating cavity 1000, thereby enhancing the sound quality improvement effect of the back tone cavity 2000 on the electroacoustic assembly 100.

With reference to fig. 7, in the present embodiment, the first magnet 262a further includes a second side wall 2624 facing the bottom wall 102, an inner wall of the second leakage hole 44 is flush with the second side wall 2624, so as to maximize a size of the second leakage hole 44, the second leakage hole 44 is located between the first magnet 262a and the bottom wall 102, and on the premise of not affecting the strength of the inner frame 22, increasing the size of the second leakage hole 44 is beneficial to increasing the amount of gas passing in and out of the back sound cavity 2000 and the sound generating cavity 1000 per unit time, i.e. the rate of gas passing in and out of the back sound cavity 2000 and the sound generating cavity 1000, so as to enhance the sound quality improvement effect of the back sound cavity 2000 on the electroacoustic assembly 100.

Further, the inner wall and the diapire 102 parallel and level of second leak hole 44 to maximize the size of second leak hole 44, second leak hole 44 is located between first driving piece 262 and diapire 102, under the prerequisite that does not influence the intensity of inner frame 22, the size of increase second leak hole 44 is favorable to increasing the gaseous volume of passing in and out back sound chamber 2000 and vocal cavity 1000 of unit interval, the gaseous rate of passing in and out back sound chamber 2000 and vocal cavity 1000 promptly, thereby strengthen the tone quality promotion effect of back sound chamber 2000 to electroacoustic component 100.

Referring to fig. 8, an embodiment of the invention further provides a mobile terminal 200 including the electroacoustic component 100 according to the embodiment of the invention. Specifically, the mobile terminal 200 further includes a housing 92, and the electroacoustic assembly 100 is fixed to a bottom end of the housing 92. It is understood that the mobile terminal 200 may be a mobile phone, a tablet computer, a notebook computer, etc.

While the invention has been described with reference to a number of illustrative embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

1. An electro-acoustic assembly, comprising:

a circuit board provided with a receiving groove;

the cover plate covers the opening of the accommodating groove, the inner wall of the accommodating groove comprises a bottom wall and a side wall, the opening is a port formed by surrounding the side wall of the accommodating groove and an inner frame, the vertical projection of the cover plate on the bottom wall is positioned between the side wall and the inner frame, a rear sound cavity is formed among the cover plate, the inner frame, the bottom wall and the side wall, a leakage hole is formed in the inner frame to communicate the sounding cavity and the rear sound cavity, the distance from the side wall to the inner frame is larger than the distance from the bottom wall to the cover plate, and the rear sound cavity is formed on the side edge of the loudspeaker monomer and arranged side by side with the sounding cavity; wherein the inner frame comprises a first surface facing away from the bottom wall, the first surface being flush with the top surface of the cover plate;

wherein, electroacoustic component still includes the screen cloth, the screen cloth is located in the back sound chamber, the screen cloth is fixed in on the internal frame, just the screen cloth covers let out the leakage hole, still be equipped with the supporting rod in the leakage hole, screen cloth laminating supporting rod, supporting rod are used for the supplementary flat screen cloth that props.

2. The electro acoustic assembly in accordance with claim 1, wherein said inner frame is fixed to said bottom wall.

3. The electro-acoustic assembly of claim 1, wherein the speaker unit further includes a first driving member and a second driving member, the first driving member and the second driving member are received in the sound-generating chamber, the first driving member is fixed on the bottom wall or the inner frame, the second driving member is fixed on the diaphragm, and the second driving member is configured to vibrate relative to the first driving member to drive the diaphragm to generate sound by vibration.

4. The electro acoustic assembly of claim 3, wherein the first driver is a magnet and the second driver is a coil, the first driver including a first magnet and a second magnet, the first magnet being fixed to the inner frame and the second magnet being fixed to the bottom wall, the second driver being located between the first magnet and the second magnet, the second driver being electrically connected to the circuit board, the circuit board being provided with a driving circuit for driving the second driver to vibrate.

5. The electro acoustic assembly of claim 4, wherein a perpendicular projection of the first magnet on the inner frame is offset from the weep hole.

6. The electro acoustic assembly of claim 5, wherein the leakage holes comprise a first leakage hole and a second leakage hole, the first leakage hole being located between a perpendicular projection of the first magnet on the inner frame and the diaphragm, the second leakage hole being located between a perpendicular projection of the first magnet on the inner frame and the bottom wall.

7. The electro-acoustic assembly in accordance with claim 1, further comprising sound absorbing particles filled in said back sound cavity.

8. A mobile terminal characterized by comprising an electro-acoustic assembly according to any one of claims 1 to 7.