CN111405421B

CN111405421B - Sound production device

Info

Publication number: CN111405421B
Application number: CN201911379703.9A
Authority: CN
Inventors: 宋威; 张帆; 金鑫
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-08-10
Anticipated expiration: 2039-12-27
Also published as: CN111405421A

Abstract

The invention provides a sounding device, which comprises a basin frame, a vibration system and a magnetic circuit system, wherein the vibration system comprises: the voice coil is arranged on the upper vibrating diaphragm and the lower vibrating diaphragm; the upper vibrating diaphragm is fixed on the basin frame and encloses an accommodating space together with the basin frame, and one side of the upper vibrating diaphragm, which is far away from the accommodating space, is communicated with the outside and serves as an upper front cavity for the upper vibrating diaphragm to sound; the peripheral side of the lower vibrating diaphragm and the peripheral side of the isolation vibrating diaphragm are respectively connected with the basin frame, and the inner peripheral side of the lower vibrating diaphragm and the inner peripheral side of the isolation sound film are respectively connected with the framework; the voice coil is respectively connected with the upper vibrating diaphragm and the framework, and drives the upper vibrating diaphragm to vibrate and simultaneously drives the framework to drive the lower vibrating diaphragm to vibrate; the isolation vibrating diaphragm, the lower vibrating diaphragm, the framework and the basin frame jointly divide the accommodating space into a lower front cavity for sounding the lower vibrating diaphragm and a rear cavity for sharing the upper vibrating diaphragm and the lower vibrating diaphragm; the basin frame is provided with a sounding hole which communicates the lower front cavity with the outside. Compared with the related art, the sound production device has higher acoustic loudness and better acoustic performance.

Description

Sound production device

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of electroacoustic conversion, in particular to a sounding device applied to an electronic sound box product.

[ background of the invention ]

Related art's sound production device includes the basin frame, is fixed in the vibration system of basin frame and the magnetic circuit that has the magnetic gap, the magnetic circuit drive vibration system vibration sound production, vibration system is including being fixed in the basin frame is used for vibrating the vibrating diaphragm of sound production, laminate in the ball top of vibrating diaphragm is close to the skeleton of magnetic circuit one side and insert and locate the magnetic gap is connected with the drive with the skeleton the voice coil loudspeaker voice coil of vibrating diaphragm vibration.

However, in the related art sounder, the vibration system and the magnetic circuit system are stacked up and down, and the structure of the magnetic circuit system is limited in the sounder with the same height, so that the BL value of the magnetic field is limited; in addition, the sounding device only has one diaphragm structure, and the effective vibration area (SD) of the diaphragm is small, so that the loudness of the sounding device is limited.

Therefore, there is a need to provide a new sound generation device to solve the above technical problems.

[ summary of the invention ]

The invention aims to provide a sounding device with high loudness and better acoustic performance.

In order to achieve the above object, the present invention provides a sound production device, which comprises a frame, a vibration system respectively supported on the frame, and a magnetic circuit system for driving the vibration system to vibrate and produce sound, wherein the magnetic circuit system has a magnetic gap; the vibration system includes:

the upper vibrating diaphragm is fixed on the basin frame, an accommodating space is enclosed by the upper vibrating diaphragm and the basin frame, and one side of the upper vibrating diaphragm, which is far away from the accommodating space, is communicated with the outside and serves as an upper front cavity for the upper vibrating diaphragm to sound;

the lower vibrating diaphragm is annular and arranged around the magnetic circuit system at intervals, the lower vibrating diaphragm is opposite to the upper vibrating diaphragm at intervals and is positioned in the accommodating space, and the peripheral side of the lower vibrating diaphragm is fixed on the basin frame;

the voice coil is inserted into the magnetic gap, connected to the upper vibrating diaphragm and connected to the upper vibrating diaphragm to drive the upper vibrating diaphragm and the lower vibrating diaphragm to vibrate and sound;

the framework is positioned in the accommodating space and arranged around the magnetic circuit system at intervals, the framework is respectively connected with the voice coil and the lower vibrating diaphragm, and the voice coil drives the upper vibrating diaphragm to vibrate and drives the framework to drive the lower vibrating diaphragm to vibrate; and the number of the first and second groups,

the isolation vibrating diaphragm is annular and arranged around the magnetic circuit system at intervals, the isolation vibrating diaphragm is arranged between the upper vibrating diaphragm and the lower vibrating diaphragm at intervals, the peripheral side of the isolation vibrating diaphragm is connected with the basin frame, and the inner peripheral side of the isolation vibrating diaphragm is connected with the framework;

the lower vibrating diaphragm, the framework, the isolation vibrating diaphragm and the basin frame jointly divide the accommodating space into a lower front cavity for the lower vibrating diaphragm to sound and a rear cavity for the upper vibrating diaphragm and the lower vibrating diaphragm to share; the basin frame is provided with a sounding hole penetrating through the basin frame, and the lower front cavity is communicated with the outside through the sounding hole.

Preferably, the framework comprises a framework body in a ring shape and arranged around the magnetic circuit system at intervals, and a framework extension wall which is bent from the framework body to the magnetic circuit system and extends into the magnetic gap; the two opposite sides of the framework body are respectively connected with the isolation vibrating diaphragm and the lower vibrating diaphragm; the framework extension wall is connected with the voice coil.

Preferably, the framework extension wall comprises a first wall bent and extended from the framework body and a second wall bent and extended from the first wall and in an arc shape; the voice coil is of a rectangular annular structure with round corners, and the second wall is attached to the round corners on the outer peripheral side of the voice coil.

Preferably, the first wall includes four and is arranged around the voice coil at intervals, each first wall bends and extends to form one second wall, and the four second walls are respectively arranged at four round corners of the voice coil.

Preferably, the lower diaphragm includes a lower folded ring portion in an annular shape, a lower vibrating portion bent and extended from an inner peripheral side of the lower folded ring portion, and a lower fixing portion bent and extended from an outer peripheral side of the lower folded ring portion; the lower vibration part is connected with the framework body, and the lower fixing part is fixed on one side, far away from the upper vibration film, of the basin frame.

Preferably, lower vibrating diaphragm still including laminate in lower vibration portion just is annular lower ball top, lower vibration portion passes through lower ball top with this body coupling of skeleton, keep apart the vibrating diaphragm with ball top interval is just to setting up down, just keep apart the vibrating diaphragm along the perpendicular to go up the width of the vibration direction of vibrating diaphragm is less than the width at ball top down.

Preferably, the framework body includes a body wall, a first reinforcing wall bent and extended from one end of the body wall close to the isolation diaphragm in a direction perpendicular to the vibration direction of the upper diaphragm, and a second reinforcing wall bent and extended from one end of the body wall close to the lower diaphragm in a direction perpendicular to the vibration direction, and the first reinforcing wall and the second reinforcing wall are respectively located on two different sides of the body wall; the first reinforcing wall is connected with the isolation diaphragm, and the second reinforcing wall is connected with the lower vibrating part.

Preferably, the upper diaphragm comprises an annular upper folded ring part, an upper vibrating part bent and extended from the inner peripheral side of the upper folded ring part, and an upper fixing part bent and extended from the outer peripheral side of the upper folded ring part, and the upper fixing part is fixed on one side of the basin stand far away from the lower diaphragm; the voice coil is connected to the upper vibrating portion.

Preferably, the upper folding ring part and the lower folding ring part are arranged oppositely.

Preferably, the upward folding ring part is of an arc structure formed by sinking towards the direction far away from the downward folding ring part, and the downward folding ring part is of an arc structure formed by sinking towards the direction far away from the upward folding ring part.

Preferably, the basin stand comprises a bottom wall for fixedly supporting the magnetic circuit system, an annular side wall bent and extended from the periphery of the bottom wall, and an annular supporting wall extended from the side wall to a direction close to the magnetic circuit system; the peripheral side of the lower vibrating diaphragm is fixed to the side wall and enables the lower vibrating diaphragm and the bottom wall to be arranged at an interval, the peripheral side of the upper vibrating diaphragm is fixed to one end, away from the bottom wall, of the side wall, the peripheral side of the isolation vibrating diaphragm is fixed to the supporting wall, and the sound emitting hole penetrates through the side wall and is located on one side, close to the bottom wall, of the supporting wall.

Preferably, the side walls include a first side wall extending from the periphery of the bottom wall in a bent manner and a second side wall extending from the first side wall in a direction away from the bottom wall, and the support wall extends from the second side wall in a bent manner; the periphery of the upper vibrating diaphragm is fixed to one end, far away from the bottom wall, of the second side wall, the periphery of the lower vibrating diaphragm is clamped and fixed between the first side wall and the second side wall, and the sound emitting hole penetrates through the second side wall.

Preferably, the magnetic circuit system comprises a magnetic yoke supported on the bottom wall, main magnetic steels respectively fixed on the magnetic yoke, and auxiliary magnetic steels surrounding the main magnetic steels, and the auxiliary magnetic steels and the main magnetic steels are spaced to form the magnetic gap; the auxiliary magnetic steel is provided with a yielding port, and the framework extends into the magnetic gap through the yielding port and is connected with the voice coil.

Preferably, the auxiliary magnetic steel comprises first auxiliary magnetic steels and second auxiliary magnetic steels, the first auxiliary magnetic steels and the second auxiliary magnetic steels are arranged on two opposite sides of the main magnetic steel at intervals, and the first auxiliary magnetic steels and the second auxiliary magnetic steels are adjacent to each other and are formed at intervals to form the relief port.

Compared with the prior art, the sound production device has the advantages that the vibration system is provided with the upper vibration film and the lower vibration film which are used for vibrating and producing sound, the upper vibration film and the lower vibration film jointly form a double-vibration-film structure of the vibration system, so that the upper vibration film and the lower vibration film respectively produce sound through the upper front cavity and the lower front cavity and share the same rear cavity, the structure effectively improves the effective vibration area (SD) of the vibration film of the vibration system, the sound production loudness of the sound production device is improved, and the acoustic performance of the sound production device is excellent.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic perspective view of a sound device according to the present invention;

FIG. 2 is an exploded perspective view of a sound device according to the present invention;

FIG. 3 is an exploded view of the skeleton of the sound device of the present invention;

FIG. 4 is a schematic view of the assembly of the vibration system and the magnetic circuit system of the sound production device according to the present invention;

FIG. 5 is an exploded perspective view of FIG. 4;

FIG. 6 is a sectional view taken along line A-A of FIG. 1;

fig. 7 is a sectional view taken along line B-B in fig. 1.

[ detailed description ] embodiments

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. 1-7, the present invention provides a sound production device 100, which includes a frame 1, a vibration system 2 and a magnetic circuit system 3 respectively supported on the frame 1, and an upper cover plate 4, wherein the magnetic circuit system 3 has a magnetic gap 30, and the magnetic circuit system 3 drives the vibration system 2 to vibrate and produce sound.

The vibration system 2 includes an upper diaphragm 21, a lower diaphragm 22, a voice coil 23, a bobbin 24, and an isolation diaphragm 25. The upper diaphragm 21, the isolation diaphragm 25 and the lower diaphragm 22 are sequentially arranged from top to bottom at intervals.

The peripheral side of the upper vibrating diaphragm 21 is fixed on the side of the basin stand 1 away from the magnetic circuit system 3. The upper vibrating diaphragm 21 and the basin stand 1 together enclose an accommodating space 10.

One side of the upper diaphragm 21, which is far away from the accommodating space 10, is communicated with the outside and serves as an upper front cavity 201 where the upper diaphragm 21 sounds; specifically, the upper cover plate 4 is covered and fixed on one side of the basin frame 1 far away from the magnetic circuit system 3, the peripheral side of the upper vibrating diaphragm 21 is clamped and fixed between the basin frame 1 and the upper cover plate 4, the upper vibrating diaphragm 21, the basin frame 1 and the upper cover plate 4 jointly enclose the upper front cavity 201, the upper cover plate 4 is provided with a sounding port 40 penetrating through the upper cover plate, and the sounding port 40 communicates the upper front cavity 201 with the outside to realize sounding.

In this embodiment, the upper diaphragm 21 includes an annular upward-folded ring portion 211, an upper vibrating portion 212 bent and extended from an inner peripheral side of the upward-folded ring portion 211, and an upper fixing portion 213 bent and extended from an outer peripheral side of the upward-folded ring portion 211, the upper fixing portion 213 is fixed to one side of the basin frame 1 away from the lower diaphragm 22, that is, the upper fixing portion 213 is fixed to the basin frame 1 and between the upper cover plate 4 in a clamping manner, and the upper vibrating portion 212 is used for vibrating and sounding.

The lower diaphragm 22 is annular and disposed around the magnetic circuit system 3 at intervals.

The lower vibrating diaphragm 22 and the upper vibrating diaphragm 21 are opposite at intervals and are located in the accommodating space 10, and the peripheral side of the lower vibrating diaphragm 22 is fixed on one side of the basin stand 1, which is far away from the upper vibrating diaphragm 21.

Specifically, the lower diaphragm 22 includes a ring-shaped downward-folded ring portion 221, a lower vibrating portion 222 bent and extended from an inner peripheral side of the downward-folded ring portion 221, and a lower fixing portion 223 bent and extended from an outer peripheral side of the downward-folded ring portion 221; the lower fixing portion 223 is fixed to a side of the frame 1 away from the upper diaphragm 21, and the lower vibrating portion 222 is connected to the frame 24.

In this embodiment, the folded-up ring portion 211 is disposed opposite to the folded-down ring portion 221. Preferably, the upward folding ring part 211 is an arc-shaped structure formed by being recessed towards a direction away from the downward folding ring part 221, and the downward folding ring part 221 is an arc-shaped structure formed by being recessed towards a direction away from the upward folding ring part 211. This structure effectively utilizes the height space of the sound production device 100, so that the upper diaphragm 21 and the lower diaphragm 22 have a larger vibration space and the vibration performance is better.

The voice coil 23 is inserted into the magnetic gap 30 and connected to one side of the upper diaphragm 21 close to the magnetic circuit system 3 to drive the upper diaphragm 21 and the lower diaphragm 22 to vibrate and sound; specifically, one end of the voice coil 23, which is far away from the magnetic circuit system 3, is connected to the upper vibration portion 212 to drive the upper diaphragm 21 to vibrate, and one end of the voice coil, which is close to the magnetic circuit system 3, is inserted into the magnetic gap 30 and connected to the bobbin 24, so that the lower diaphragm 22 is driven by the bobbin 24 to vibrate. Above-mentioned structure, go up vibrating diaphragm 21 and lower vibrating diaphragm 22 and constitute two vibrating diaphragm vibration sound production structures jointly, the effectual effective vibration area (SD) of vibration that has improved vibration system 2 has improved sound production device 100's sound production loudness to make sound production device 100's acoustic performance excellent. In addition, while the effective vibration area (SD) of the vibrating diaphragm of the sound generating device 100 is increased, the lower vibrating diaphragm 22 is arranged around the magnetic circuit system 3, so that the lower vibrating diaphragm 22 is arranged in the accommodating space 10, the space utilization rate inside the sound generating device 100 is effectively improved, that is, the sound generating device 100 can be smaller in size under the condition that the effective vibration areas (SD) of the vibrating diaphragms of the sound generating device 100 are the same, and the miniaturization development is facilitated.

The skeleton 24 is annular, and the skeleton 24 is located in the accommodating space 10 and arranged around the magnetic circuit system 3 at intervals.

The skeleton 24 respectively with the voice coil loudspeaker voice coil 23 with lower vibrating diaphragm 22 is connected, voice coil loudspeaker voice coil 23 drive go up vibrating diaphragm 21 vibration sound production, drive simultaneously the skeleton 24 is in order to drive vibrating diaphragm 22 vibration sound production down to realize two vibrating diaphragm vibration sound production structures.

The isolation diaphragm 25 is annular and arranged around the magnetic circuit system 3 at intervals.

The isolation diaphragm 25 is arranged between the upper diaphragm 21 and the lower diaphragm 22 at intervals, the peripheral side of the isolation diaphragm 25 is connected with the basin frame 1, and the inner peripheral side of the isolation diaphragm 25 is connected with the framework 24. Preferably, the upper vibration portion 212 is opposite to and spaced from the isolation diaphragm 25.

Lower vibrating diaphragm 22 skeleton 24 keep apart vibrating diaphragm 25 and basin frame 1 will together accommodating space 10 separates into and is used for lower front chamber 202 of vibrating diaphragm 22 sound production and be used for go up vibrating diaphragm 21 with the shared back chamber 101 of vibrating diaphragm 22 down. The frame 1 is provided with a sound hole 120 penetrating through the frame, the lower front cavity 202 is communicated with the outside through the sound hole 120 to realize sound production, and the lower vibrating diaphragm 22 and the upper vibrating diaphragm 21 share the rear cavity 101.

That is, the isolation diaphragm 25 isolates the back cavity 101 and the lower front cavity 202 from the accommodating space 10, so that the back cavity 101 and the lower front cavity 202 are prevented from being acoustically short-circuited.

In the present embodiment, the frame 24 includes a frame body 241 and a frame extension wall 242.

The framework body 241 is annular and arranged around the magnetic circuit system 3, and the framework body 241 is spaced from the magnetic circuit system 3; the relative both sides of skeleton body 241 edge the vibration direction of vibration system 2 respectively with keep apart the vibrating diaphragm 25 with the lower vibration portion 222 of vibrating diaphragm 22 is connected down, keep apart the vibrating diaphragm 25 the skeleton body 241 vibrating diaphragm 22 down and basin frame 1 will jointly accommodating space 10 separates into back chamber 101 with front chamber 202 down.

Further, the skeleton body 241 includes a body wall 2411, a first reinforcing wall 2412 bent and extended from one end of the body wall 2411 close to the isolation diaphragm 25 in a direction perpendicular to the vibration direction of the upper diaphragm 21, and a second reinforcing wall 2413 bent and extended from one end of the body wall 2411 close to the lower diaphragm 22 in a direction perpendicular to the vibration direction, wherein the first reinforcing wall 2412 is connected to the inner peripheral side of the isolation diaphragm 25, and the second reinforcing wall 2413 is connected to the lower vibration portion 222 of the lower diaphragm 22.

Due to the arrangement of the first reinforcing wall 2412 and the second reinforcing wall 2413, the bonding areas of the skeleton body 241 and the isolation diaphragm 25 and the lower vibration part 222 are effectively increased, that is, the connection strengths of the skeleton body 241 and the isolation diaphragm 25 and the lower vibration part 222 are effectively increased, so that the vibration reliability is further improved.

In this embodiment, the first reinforcing wall 2412 and the second reinforcing wall 2413 are located on opposite sides of the body wall 2411.

Preferably, the lower diaphragm 22 further includes a lower spherical top 224 attached to the lower vibration part 222 and in an annular shape, the lower vibration part 222 is connected to the skeleton body 241 through the lower spherical top 224, and the arrangement of the lower spherical top 224 effectively improves the vibration reliability of the lower diaphragm 22; preferably, the isolation diaphragm 25 and the lower ball top 224 are arranged opposite to each other at an interval, and the width of the isolation diaphragm 25 in the direction perpendicular to the vibration direction of the upper diaphragm 21 is smaller than the width of the lower ball top 224. This structural arrangement avoids the loss of the effective vibration area SD of the diaphragm 22 of the lower diaphragm caused by the excessive width of the isolation diaphragm 25, which affects the acoustic performance.

The bobbin extension wall 242 is bent from the bobbin body 241 toward the magnetic circuit system 3 and extends into the magnetic gap 30, and is connected to the voice coil 23.

Further, the skeletal extension wall 242 includes a first wall 2421 and a second wall 2422; the first wall 2421 is bent from the skeleton body 241 to the magnetic circuit system 3 and extends into the magnetic gap 30; the second wall 242 is curved, and is bent and extended from the first wall 2421 and abuts against the voice coil 23.

It should be noted that the form of the voice coil is not limited, for example, in the present embodiment, the voice coil 23 has a rectangular ring structure with rounded corners, and the second wall 2422 is attached to the rounded corners on the outer peripheral side of the voice coil 23.

Preferably, the first walls 2421 include four walls and are spaced apart from each other and disposed around the voice coil 23, each of the first walls 2421 is bent and extended to form one second wall 2422, i.e., the four second walls 2422 are formed integrally, and the four second walls 2422 are respectively disposed at four round corners of the voice coil. The voice coil 23 is symmetrically supported by the structure, so that the support is more stable, and the vibration reliability is better.

In the present embodiment, the frame 1 includes a bottom wall 11 for fixedly supporting the magnetic circuit system 3, an annular side wall 12 extending from a periphery of the bottom wall 11 in a bent manner, and an annular support wall 13 extending from the side wall 12 in a direction approaching the magnetic circuit system 3.

The outer peripheral side of the lower diaphragm 22 is fixed to the sidewall 12, specifically, the lower fixing portion 223 of the lower diaphragm 22 is fixed to the sidewall 12, and the lower diaphragm 22 and the bottom wall 11 are spaced apart from each other to provide a vibration space for the lower diaphragm 22.

The outer peripheral side of the upper diaphragm 21 is fixed to one end of the sidewall 12 away from the bottom wall 11, specifically, the upper fixing portion 213 of the upper diaphragm 21 is fixed to one end of the sidewall 12 away from the bottom wall 11.

The sound emitting hole 120 is disposed through the side wall 12 and is located on a side of the supporting wall 13 close to the bottom wall 11.

Specifically, the side wall 12 includes a first side wall 121 extending from the periphery of the bottom wall 11 in a bent manner, and a second side wall 122 extending from the first side wall 121 in a direction away from the bottom wall 11, and the support wall 13 extends from the second side wall 122 in a bent manner.

The outer peripheral side of the upper diaphragm 21, that is, the upper fixing portion 213 is fixed to an end of the second side wall 122 away from the bottom wall 11; an outer peripheral side of the lower diaphragm 22, that is, a lower fixing portion 223 is interposed and fixed between the first sidewall 121 and the second sidewall 122. The sound emitting hole 120 is disposed through the second side wall 122 and is located on a side of the support wall 13 close to the bottom wall 11.

The outer peripheral side of the isolation diaphragm 25 is fixed to the support wall 13 of the frame 1. At this time, the lower diaphragm 22, the skeleton 24, the isolation diaphragm 25, and the second sidewall 122 together enclose the lower front cavity 202 for the lower diaphragm 22 to sound.

The magnetic circuit system 3 includes a magnetic yoke 31 supported on the bottom wall 11, a main magnetic steel 32 fixed to the magnetic yoke 31, and a sub magnetic steel 33 surrounding the main magnetic steel 32. The secondary magnetic steel 33 and the primary magnetic steel 32 are spaced to form the magnetic gap 30.

The auxiliary magnetic steel 33 is provided with a let position opening 330, and the framework 24 extends into the magnetic gap 30 through the let position opening 330 and is connected with the voice coil 23. Specifically, the first wall 2412 of the framework 24 extends into the magnetic gap 30 through the relief opening 330.

Preferably, the auxiliary magnetic steel 33 includes a first auxiliary magnetic steel 331 disposed at two opposite sides of the main magnetic steel 32 at an interval and a second auxiliary magnetic steel 332 disposed at two opposite sides of the main magnetic steel 32 at an interval, and the adjacent first auxiliary magnetic steel 331 and the second auxiliary magnetic steel 332 are disposed at an interval to form the relief opening 330.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. A sounder which comprises a frame, a vibration system and a magnetic circuit system, wherein the vibration system is respectively supported on the frame, the magnetic circuit system drives the vibration system to vibrate and sound, the magnetic circuit system is provided with a magnetic gap, and the vibration system comprises:

2. The sounder device according to claim 1, wherein the bobbin comprises a bobbin body disposed in an annular shape at intervals around the magnetic circuit system, and a bobbin extension wall extending from the bobbin body to the magnetic circuit system and extending into the magnetic gap; the two opposite sides of the framework body are respectively connected with the isolation vibrating diaphragm and the lower vibrating diaphragm; the framework extension wall is connected with the voice coil.

3. The sounder device according to claim 2, wherein the skeletal extension wall comprises a first wall extending from the skeletal body and a second wall extending from the first wall and having an arc shape; the voice coil is of a rectangular annular structure with round corners, and the second wall is attached to the round corners on the outer peripheral side of the voice coil.

4. The sounder device according to claim 3, wherein the first walls comprise four walls spaced around the voice coil, each of the first walls being folded to extend to form one of the second walls, and the four second walls being disposed at four corners of the voice coil.

5. The sounding device according to claim 2, wherein the lower diaphragm includes a lower folded ring portion having a ring shape, a lower vibrating portion bent and extended from an inner peripheral side of the lower folded ring portion, and a lower fixing portion bent and extended from an outer peripheral side of the lower folded ring portion; the lower vibration part is connected with the framework body, and the lower fixing part is fixed on one side, far away from the upper vibration film, of the basin frame.

6. The sounding device according to claim 5, wherein the lower diaphragm further comprises a lower ball top portion attached to the lower vibrating portion and having an annular shape, the lower vibrating portion is connected to the frame body through the lower ball top portion, the isolation diaphragm is spaced from the lower ball top portion and is disposed opposite to the lower ball top portion, and the width of the isolation diaphragm in the direction perpendicular to the vibration direction of the upper diaphragm is smaller than the width of the lower ball top portion.

7. The sounding device according to claim 5 or 6, wherein the skeleton body comprises a body wall, a first reinforcing wall extending from an end of the body wall close to the isolation diaphragm in a bending manner perpendicular to the vibration direction of the upper diaphragm, and a second reinforcing wall extending from an end of the body wall close to the lower diaphragm in a bending manner perpendicular to the vibration direction, and the first reinforcing wall and the second reinforcing wall are respectively located on two different sides of the body wall; the first reinforcing wall is connected with the isolation diaphragm, and the second reinforcing wall is connected with the lower vibrating part.

8. The sounding device according to claim 5, wherein the upper diaphragm includes an upper folded ring portion having a ring shape, an upper vibrating portion extending from an inner periphery of the upper folded ring portion, and an upper fixing portion extending from an outer periphery of the upper folded ring portion, the upper fixing portion being fixed to a side of the frame away from the lower diaphragm; the voice coil is connected to the upper vibrating portion.

9. The sounder device according to claim 8, wherein the folded-up ring portion is disposed directly opposite the folded-down ring portion.

10. The sound production device as claimed in claim 9, wherein the upper folded ring portion is formed in an arc-shaped structure which is recessed away from the lower folded ring portion, and the lower folded ring portion is formed in an arc-shaped structure which is recessed away from the upper folded ring portion.

11. The sounder device according to claim 10, wherein the frame comprises a bottom wall for fixedly supporting the magnetic circuit system, an annular side wall extending from a periphery of the bottom wall in a bent manner, and an annular supporting wall extending from the side wall in a direction approaching the magnetic circuit system; the peripheral side of the lower vibrating diaphragm is fixed to the side wall and enables the lower vibrating diaphragm and the bottom wall to be arranged at an interval, the peripheral side of the upper vibrating diaphragm is fixed to one end, away from the bottom wall, of the side wall, the peripheral side of the isolation vibrating diaphragm is fixed to the supporting wall, and the sound emitting hole penetrates through the side wall and is located on one side, close to the bottom wall, of the supporting wall.

12. The sounder device according to claim 11, wherein the side walls include a first side wall extending from a periphery of the bottom wall in a bent manner and a second side wall extending from the first side wall in a direction away from the bottom wall, and the support wall extends from the second side wall in a bent manner; the periphery of the upper vibrating diaphragm is fixed to one end, far away from the bottom wall, of the second side wall, the periphery of the lower vibrating diaphragm is clamped and fixed between the first side wall and the second side wall, and the sound emitting hole penetrates through the second side wall.

13. The sounding device as claimed in claim 12, wherein the magnetic circuit system comprises a yoke supported on the bottom wall, a main magnetic steel fixed to the yoke, and a secondary magnetic steel surrounding the main magnetic steel, the secondary magnetic steel and the main magnetic steel being spaced apart to form the magnetic gap; the auxiliary magnetic steel is provided with a yielding port, and the framework extends into the magnetic gap through the yielding port and is connected with the voice coil.

14. The sound production device as claimed in claim 13, wherein the secondary magnetic steels include a first secondary magnetic steel disposed at two opposite sides of the main magnetic steel at intervals and a second secondary magnetic steel disposed at two opposite sides of the main magnetic steel at intervals, and the adjacent first secondary magnetic steel and the adjacent second secondary magnetic steel form the relief opening at intervals.