CN107592598B

CN107592598B - Electroacoustic component, electroacoustic device and mobile terminal

Info

Publication number: CN107592598B
Application number: CN201710807386.0A
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: 2020-07-07
Anticipated expiration: 2037-09-08
Also published as: CN107592598A

Abstract

The invention discloses an electroacoustic component which comprises a loudspeaker monomer, a box body, a screen and a support, wherein the loudspeaker monomer is accommodated in the box body, a rear sound cavity is formed between the loudspeaker monomer and the box body, sound absorption particles are filled in the rear sound cavity, the loudspeaker monomer is provided with leakage holes, the leakage holes enable the rear sound cavity to be communicated with a sound production cavity in the loudspeaker monomer, the screen is arranged in the rear sound cavity, the support is arranged on the periphery of the leakage holes and connected between the screen and the loudspeaker monomer so as to prevent the sound absorption particles from entering the leakage holes, the vertical projection of the screen on the loudspeaker monomer covers the leakage holes, and the size of the screen is larger than that of the leakage holes. The invention also discloses an electroacoustic device and a mobile terminal. The superficial area size of screen cloth is greater than the size of leaking the hole, has strengthened tone quality and has promoted the effect, has improved user experience.

Description

Electroacoustic component, electroacoustic device and mobile terminal

Technical Field

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

Background

With the application of mobile terminal products becoming more and more extensive, users also demand higher and higher sound quality effects of sound production of electroacoustic components of mobile terminals. At present, granular sound-absorbing materials are filled in the sound cavity of the electroacoustic component of most mobile terminal products so as to improve the bass effect of the electroacoustic component, in order to avoid scattering of the sound-absorbing materials everywhere or leakage from the sound cavity, the existing electroacoustic component is placed in the sound cavity after independently packaging the granular sound-absorbing materials, so that the filling amount of the sound-absorbing materials is greatly limited, the sound-absorbing materials cannot be maximally filled, and the tone quality improvement effect of the electroacoustic component is limited.

Disclosure of Invention

The invention provides an electroacoustic component, an electroacoustic device and a mobile terminal, and aims to solve the problem that the tone quality effect of the electroacoustic component is poor in the prior art.

In order to solve the technical problem, the invention provides an electroacoustic component which comprises a loudspeaker monomer, a box body, a screen and a support, wherein the loudspeaker monomer is accommodated in the box body, a rear sound cavity is formed between the loudspeaker monomer and the box body, sound absorption particles are filled in the rear sound cavity, the loudspeaker monomer is provided with leakage holes, the rear sound cavity is communicated with a sound production cavity in the loudspeaker monomer through the leakage holes, the screen is arranged in the rear sound cavity, the support is arranged on the periphery of the leakage holes and connected between the screen and the loudspeaker monomer so as to prevent the sound absorption particles from entering the leakage holes, the vertical projection of the screen on the loudspeaker monomer covers the leakage holes, and the size of the screen is larger than that of the leakage holes.

In one embodiment, the speaker unit includes a frame, the frame includes the internal face and the outer wall face that set up relatively, the leak hole intercommunication the internal face with the outer wall face, the support is the framework shape, the support includes relative first end and the second end that sets up, first end is fixed in the outer wall face, the periphery fixed connection of screen cloth in the second end, and the second end will the screen cloth expandes.

In one embodiment, the bracket includes a second end surface and an outer peripheral surface, the second end surface is an end surface of a side of the second end facing away from the frame, the outer peripheral surface connects the second end surface and the outer wall surface, and an edge of the screen is attached to the outer peripheral surface.

In one embodiment, a fillet is disposed at a junction between the outer peripheral surface and the second end surface, and an edge of the screen mesh is attached to the surface of the fillet.

In one embodiment, the bracket further comprises a support bar fixed to the second end, the screen being attached to the support bar and located on a side of the support bar facing away from the leakage hole, the support bar being configured to reinforce the connection of the screen to the bracket.

In one embodiment, the leakage orifice falls within an annular perpendicular projection of the holder on the outer wall surface.

In one embodiment, the speaker unit further includes a diaphragm and a driving component, the periphery of the diaphragm is fixedly connected to the frame, the driving component includes a first driving part fixed to the diaphragm and a second driving part fixed to the frame, and the first driving part can vibrate relative to the second driving part to drive the diaphragm to vibrate and sound.

In one embodiment, the speaker unit further includes a cover plate fixed to the frame, the cover plate is opposite to the diaphragm, the cover plate and the frame form the sounding cavity therebetween, and the leakage hole communicates the sounding cavity with the back sound cavity.

In one embodiment, the box body includes a top plate, a bottom plate disposed opposite to the top plate, and a side plate fixed between the top plate and the bottom plate, the diaphragm abuts against the top plate, and a distance from the side plate to the frame is greater than a distance from the bottom plate to the frame.

The invention also provides an electroacoustic device, which comprises a driving circuit and the electroacoustic component, wherein the driving circuit is electrically connected to the loudspeaker single body and controls the loudspeaker single body to vibrate and produce sound.

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

The invention has the following beneficial effects: the sound absorption particle is filled in the back sound chamber, the filling amount of the sound absorption particle is increased, the screen cloth is arranged on the loudspeaker monomer through the bracket, the screen cloth prevents the sound absorption particle from entering the sounding chamber and simultaneously allows gas exchange between the back sound chamber and the sounding chamber, the surface area size of the screen cloth is larger than the size of a leakage hole, the transmission rate of gas from the back sound chamber to the sounding chamber is improved on the premise of not increasing the number and the size of the leakage hole, the tone quality improving effect of the electroacoustic component is enhanced, and the user experience is improved.

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 assembly according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of a speaker unit of an electroacoustic assembly according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view 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 partially enlarged cross-sectional schematic view of an electro-acoustic assembly according to another embodiment.

Fig. 6 is a partially enlarged cross-sectional schematic view of an electro-acoustic assembly according to another embodiment.

Fig. 7 is a schematic structural diagram of an electroacoustic device according to an 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 together, an electroacoustic assembly 100 according to an embodiment of the present invention includes a speaker unit 10 and a case 14, the speaker unit 10 is accommodated in the case 14, specifically, the speaker unit 10 is configured to vibrate to generate sound waves, so as to form sound, vibration of the speaker unit 10 causes vibration of air or gas in a sound generating chamber 1000, the speaker unit 10 is disposed in the case 14, a back sound chamber 1400 is formed between the speaker unit 10 and the case 14, the back sound chamber 1400 is filled with sound absorbing particles 20, the speaker unit 10 is provided with a leakage hole 120, the leakage hole 120 enables the back sound chamber 1400 to communicate with the sound generating chamber 1000 inside the speaker unit 10, a screen 40 is disposed in the back sound chamber 1400, a bracket 30 is disposed at a periphery of the leakage hole 120 and connected between the screen 40 and the speaker unit 10, so as to prevent the sound absorbing particles 20 from entering the leakage hole 120, a vertical projection of the screen 40 on the speaker unit 10 covers the leakage, the size of the screen 40 is larger than the size of the weep holes 120. The leakage hole 120 is communicated with the sounding cavity 1000 and the rear sound cavity 1400, and when the speaker unit 10 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 1400 from the sounding cavity 1000 through the leakage hole 120 and causes the sound-absorbing particles 20 in the rear sound cavity 1400 to vibrate, and the friction between the sound-absorbing particles 20 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 1400 through the leakage hole 120 and affects the characteristics of the sound wave propagated outward by the diaphragm 70, thereby optimizing the sound quality of the sound generated by the electroacoustic assembly 100.

Sound absorption particle 20 is filled in back sound chamber 1400, the filling amount of sound absorption particle 20 has been increased, screen cloth 40 erects on speaker monomer 10 through support 30, screen cloth 40 prevents sound absorption particle 20 to get into the gas exchange between sound production chamber 1000 and sound production chamber 1400, screen cloth 40's surface area size is greater than the size of leak hole 120, the transmission rate of gas from back sound chamber 1400 to sound production chamber 1000 has been improved under the prerequisite that does not increase leak hole 120 number and size, the tone quality of electroacoustic component 100 has been strengthened and has been promoted the effect, user experience has been improved.

In this embodiment, the leak hole 120 is located between the top and bottom ends. The leakage holes 120 may be circular holes or strip-shaped holes. The frame 12 may be a plastic or metal member.

In this embodiment, the speaker unit 10 includes a frame 12, a diaphragm 70 and a driving assembly, the frame 12 includes an inner wall surface 124 and an outer wall surface 122 that are disposed opposite to each other, and the leakage hole 120 penetrates through the outer wall surface 122 and the inner wall surface 124. The periphery of the diaphragm 70 is fixedly connected to the frame 12, the driving assembly includes a first driving member 52 fixed to the diaphragm 70 and a second driving member 54 fixed to the frame 12, and the first driving member 52 can vibrate relative to the second driving member 54 to drive the diaphragm 70 to vibrate and generate sound. The leakage hole 120 connects the sounding cavity 1000 and the rear sound cavity 1400, and when the speaker unit 10 works, the energized first driving member 52 moves relative to the second driving member 54, and the diaphragm 70 fixedly connected to the first driving member 52 moves synchronously with the first driving member 52, or it is understood that the diaphragm 70 vibrates to form sound waves, and the diaphragm 70 vibrates to compress or stretch the gas in the sounding cavity 1000. The frame 12 includes a top end and a bottom end disposed opposite the top end. The top end is fixedly connected to the periphery of the diaphragm 70. The frame 12 may be a plastic or metal member.

In one embodiment, the first drive member 52 is a coil. The second driving member 54 is a magnet. The first driving member 52 receives the current signal and generates a magnetic field. The first drive member 52 is responsive to a change in the current signal to produce a change in the direction of the magnetic field. The second driving member 54 is a permanent magnet, and the direction of the magnetic field of the second driving member 54 does not change. The first driving member 52 is interacted with the magnetic field of the second driving member 54 under the change of the current signal, and can slide close to or away from the second driving member 54, thereby driving the diaphragm 70 to vibrate. The second driver 54 includes a first magnet 542 fixed to the inner wall surface 124 and a second magnet 544 located inside the first magnet 542. There is a spacing between the first magnet 542 and the second magnet 544. The top of the first driving member 52 is fixedly connected to the folds 72 of the diaphragm 70, and the bottom of the first driving member 52 is accommodated in the space. Since the first driving member 52 slides up and down within the interval, the thickness of the speaker unit 10 can be effectively reduced.

In one embodiment, the first driving member 52 slides relative to the second driving member 54 in a direction generally parallel to the normal of the diaphragm 70. The first driving member 52 is reciprocally slidable relative to the second driving member 54 to thereby cause a substantially geometrically close region of the diaphragm 70 to oscillate in a normal reciprocating manner. The diaphragm 70, when vibrated in a region generally near the geometric center, induces airflow and thus generates sound waves. The sound waves may propagate from the diaphragm 70 to the outside of the electro-acoustic assembly 100 and may thus be received by a user. Since the sound emitting direction of the leak hole 120 is substantially perpendicular to the normal direction of the diaphragm 70, that is, the electroacoustic assembly 100 has no sound propagation path in a direction substantially parallel to the normal direction of the diaphragm 70, the top end and the bottom end of the frame 12 can respectively abut against the external component, so that the speaker unit 10 can be stably mounted, and the use space can be saved. The frame 12 includes an outer wall surface 122 and an inner wall surface 124 that are disposed opposite one another, and in this embodiment, the second driver 54 is at least partially fixed to the inner wall surface 124 of the frame 12.

In one embodiment, the diaphragm 70 is provided with corrugations 72 between the periphery and the geometric center. The corrugations 72 extend in the circumferential direction of the diaphragm 70. The corrugations 72 reduce the tension of the diaphragm 70, thereby making it easier for the diaphragm 70 to produce deformation vibrations in the region near the geometric center. The folds 72 are fixedly connected to the first driving member 52, so that the first driving member 52 drives the diaphragm 70 to deform. The material of the diaphragm 70 may be paper, fiber, metal, wool, silk, etc.

In this embodiment, the speaker unit 10 further includes a cover plate 60 fixed to the frame 12, the cover plate 60 is disposed opposite to the diaphragm 70, a sounding cavity 1000 is formed among the diaphragm 70, the cover plate 60 and the frame 12, and the leakage hole 120 communicates the sounding cavity 1000 and the back sound cavity 1400.

Sound absorption particle 20 is filled in back sound chamber 1400, the filling amount of sound absorption particle 20 has been increased, screen cloth 40 is fixed in the position of leakage hole 120 through support 30, sound absorption particle 20 can not pass screen cloth 40, and the gas in speaker monomer 10 and the gas in back sound chamber 1400 can pass screen cloth 40 and go in and out, thereby can utilize sound absorption particle 20 to improve tone quality, support 30 erects screen cloth 40 on frame 12, and the surface area size of screen cloth 40 is greater than the size of leakage hole 120, improved the transmission rate of gas from back sound chamber 1400 to speaker monomer 10 direction under the prerequisite that does not increase leakage hole 120 number and size, the tone quality promotion effect of electroacoustic component 100 has been strengthened, user experience has been improved.

In this embodiment, the box 14 includes a top plate 142, a bottom plate 146 disposed opposite the top plate 142, and a side plate 144 secured between the top plate 142 and the bottom plate 146. The diaphragm 70 abuts against the top plate 142, and the distance from the side plate 144 to the frame 12 is greater than the distance from the bottom plate 146 to the frame 12, so that the back sound cavity 1400 is formed at the side of the speaker unit 10, the thickness of the electroacoustic component 100 is reduced, and the mobile terminal 300 is light and thin.

In this embodiment, the cover plate 60 abuts against the bottom plate 146. I.e., the distance from the bottom panel 146 to the cover panel 60 is less than the distance from the side panel 144 to the frame 12. The periphery of the cover plate 60 is fixed to the inside of the frame 12 so that the distance from the bottom plate 146 to the frame 12 is smaller than the distance from the side plates 144 to the frame 12, so that the thickness of the box 14 is sufficiently small.

In the present embodiment, the mesh 40 is gauze. The gauze may be an opening in the outer wall 122 that covers the leak hole 120. The screen 40 covers the leakage hole 120, so that the sound absorption particles 20 are prevented from entering the sound production cavity 1000, and the influence on the sound production of the speaker unit 10 is avoided. The screen 40 covers the leakage holes 120, so that the sound-absorbing particles 20 can be completely filled between the side plate 144 and the frame 12, and the sound-absorbing particles 20 do not need to be packaged first and then contained in the back sound cavity 1400, which not only improves the sound quality of the electroacoustic device 200, but also reduces the production cost of the electroacoustic device 200.

Referring to fig. 4, the bracket 30 is in the shape of a frame, the bracket 30 includes a first end 32 and a second end 34 that are disposed opposite to each other, the first end 32 is fixed to the outer wall 122, the periphery of the screen 40 is fixedly connected to the second end 34, and the second end 34 supports the screen 40. In one embodiment, the holder 30 has a ring shape, and in another embodiment, the holder 30 may have a frame shape such as a square frame. The first end 32 and the second end 34 of the bracket 30 are two axial ends of the frame body, the first end 32 is fixedly connected to the outer wall surface 122 in a manner of pasting or welding, etc., the second end 34 is an end away from the outer wall surface 122, and the screen 40 is fixed to the second end 34 in a manner of pasting. In one embodiment, the edges of the screen 40 are secured to the second end 34, and the second end 34 stretches the screen 40 apart, thereby causing the screen 40 to flatten out. The screen 40 blocks the sound-absorbing particles 20 in the rear sound cavity 1400 from entering the sound-generating cavity 1000, and allows air to pass through, so that the sound-absorbing particles 20 can be filled in the rear sound cavity 1400 without leaking, thereby maximally filling the sound-absorbing particles 20 and improving the sound quality effect.

In this embodiment, the support 30 has a certain thickness along the direction perpendicular to the outer wall surface 122, and the area of the screen 40 is greater than the area of the leakage hole 120, and when the gas passes through the screen 40 from the back sound cavity 1400 to enter the sounding cavity 1000, the screen 40 also plays a role similar to a funnel, so that the gas enters the leakage hole 120 at an increased rate, and the tone quality improvement effect is enhanced. In one embodiment, the leak hole 120 falls within an annular perpendicular projection of the bracket 30 on the outer wall surface 122. Specifically, the vertical projection of the frame-shaped leakage hole 120 on the outer wall surface 122 surrounds the leakage hole 120 and is larger than the size of the leakage hole 120, so that the support 30 can support the screen 40 with the size larger than that of the leakage hole 120, which is beneficial to assembling the screen 40 with a large size.

In this embodiment, the bracket 30 includes a second end surface 340 and an outer peripheral surface 360, the second end surface 340 is an end surface of the second end 34 facing away from the frame 12, the outer peripheral surface 360 connects the second end surface 340 and the outer wall surface 122, and an edge of the screen 40 is attached to the outer peripheral surface 360. Specifically, the edge of the screen 40 is attached to the outer circumferential surface 360 by an adhesive, and the outer circumferential surface 360 faces the outer side of the frame-shaped bracket 30, and applies a force to the screen 40 in a direction away from the center of the screen 40, thereby spreading the screen 40. The connection mode that the periphery surface 360 is pasted on the edge of the screen 40 is simple and easy, and the effect of opening the screen 40 is good.

Referring to fig. 5, in one embodiment, a fillet 38 is disposed at the intersection of the outer peripheral surface 360 and the second end surface 340, and the edge of the screen 40 is attached to the surface of the fillet 38. Specifically, the smooth fillet 38 replaces a sharp corner between the junction of the second end face 340 and the peripheral surface 360, so that the damage to the screen 40 is avoided, the service life of the screen 40 is prolonged, and the product maintenance cost is reduced.

Referring to fig. 6, in one embodiment, the bracket 30 further includes a support rod 310, the support rod 310 is fixed to the second end 34, the screen 40 is attached to the support rod 310, and the screen 40 is located on a side of the support rod 310 facing away from the leakage hole 120, and the support rod 310 is used for reinforcing the connection of the screen 40 to the bracket 30. Specifically, the support rods 310 assist in supporting the screen mesh 40, the support rods 310 and the sound-absorbing particles 20 are respectively located on two opposite sides of the screen mesh 40, the sound-absorbing particles 20 generate extrusion force on the screen mesh 40 due to self gravity or product shaking, if the extrusion force is too large, the screen mesh 40 falls off from the support 30, the support rods 310 provide support force for the screen mesh 40 from one side of the screen mesh 40 away from the sound-absorbing particles 20, the screen mesh 40 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.

With reference to fig. 6, an embodiment of the present invention further provides an electroacoustic device 200, where the electroacoustic device 200 includes a driving circuit 80 and the electroacoustic component 100 provided in the embodiment of the present invention, and the driving circuit 80 is electrically connected to the speaker unit 10 and controls the speaker unit 10 to vibrate and generate sound. Specifically, the driving circuit 80 is electrically connected to the first driving member 52 or the second driving member 54, and the driving circuit 80 drives the first driving member 52 and the second driving member 54 to move relative to each other, so as to vibrate and generate sound of the diaphragm 70.

With reference to fig. 7, an embodiment of the present invention further provides a mobile terminal 300 including the electroacoustic device 200 according to an embodiment of the present invention. Specifically, the mobile terminal 300 includes a housing 92 and a main board 90 fixed in the housing 92, wherein the driving circuit 80 is integrated on the main board 90. The electro-acoustic device 200 is fixed to the bottom end of the housing 92. The first driving member 52 of the electro-acoustic assembly 100 is electrically connected to the main board 90, receives the current signal from the main board 90, and slides relative to the second driving member 54, so as to make the electro-acoustic assembly 100 generate sound. It is understood that the mobile terminal 300 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 electroacoustic component is characterized by comprising a loudspeaker monomer, a box body, a screen and a support, wherein the loudspeaker monomer is accommodated in the box body, a rear sound cavity is formed between the loudspeaker monomer and the box body, sound absorption particles are filled in the rear sound cavity, the loudspeaker monomer is provided with leakage holes, the rear sound cavity is communicated with a sound production cavity inside the loudspeaker monomer through the leakage holes, when gas enters the rear sound cavity from the sound production cavity through the leakage holes, the sound absorption particles in the rear sound cavity vibrate, the friction among the sound absorption particles consumes the energy of sound waves, the vibration effect of the gas is changed, and the characteristics of the sound waves are changed; the screen is arranged in the rear sound cavity, the support is arranged on the periphery of the leakage hole and connected between the screen and the loudspeaker single body so as to prevent the sound absorption particles from entering the leakage hole, the vertical projection of the screen on the loudspeaker single body covers the leakage hole, and the size of the screen is larger than that of the leakage hole;

the loudspeaker unit comprises a frame, the frame comprises an inner wall surface and an outer wall surface which are oppositely arranged, the leakage hole is communicated with the inner wall surface and the outer wall surface, the support is in a frame body shape, the support comprises a first end and a second end which are oppositely arranged, the first end is fixed on the outer wall surface, the periphery of the screen is fixedly connected to the second end, the second end expands the screen, and the screen, the support and the outer wall surface form a chamber; when gas passes through the screen cloth from the back sound chamber and gets into the in-process of making a sound the chamber under the effect of screen cloth for gas gets into the speed increase of letting out leakage hole, promotes the tone quality effect, wherein, the screen cloth is the gauze.

2. The electroacoustic assembly of claim 1 wherein the frame includes a second end surface and a peripheral surface, the second end surface being an end surface of the second end facing away from the frame, the peripheral surface connecting the second end surface and the outer wall surface, and an edge of the screen being attached to the peripheral surface.

3. The electro acoustic assembly of claim 2, wherein a fillet is provided at an intersection of the outer peripheral surface and the second end surface, and an edge of the screen is fitted to the fillet surface.

4. The electro acoustic assembly in accordance with claim 2, wherein said bracket further comprises a support rod secured to said second end, said screen being attached to said support rod and said screen being located on a side of said support rod facing away from said leakage hole, said support rod being configured to reinforce said screen to said bracket.

5. The electro acoustic assembly in accordance with claim 1, wherein said leakage hole falls within an annular perpendicular projection of said bracket on said outer wall surface.

6. The electroacoustic assembly of any one of claims 1 to 5 wherein the speaker unit further comprises a diaphragm and a driving assembly, wherein a periphery of the diaphragm is fixedly connected to the frame, the driving assembly comprises a first driving member fixed to the diaphragm and a second driving member fixed to the frame, and the first driving member is capable of vibrating relative to the second driving member to drive the diaphragm to vibrate and generate sound.

7. The electro-acoustic assembly of claim 6, wherein the speaker unit further includes a cover plate fixed to the frame, the cover plate being disposed opposite to the diaphragm, the cover plate and the frame defining the sound-generating chamber therebetween, and the leakage hole communicating the sound-generating chamber with the back sound chamber.

8. The electro-acoustic assembly according to claim 7, wherein the box body comprises a top plate and a bottom plate disposed opposite to the top plate, and a side plate fixed between the top plate and the bottom plate, the diaphragm abuts against the top plate, and a distance from the side plate to the frame is greater than a distance from the bottom plate to the frame.

9. An electro-acoustic device, comprising a driving circuit and the electro-acoustic assembly of any one of claims 1 to 8, wherein the driving circuit is electrically connected to the speaker unit and controls the speaker unit to vibrate and generate sound.

10. A mobile terminal characterized by comprising the electro-acoustic apparatus of claim 9.