CN215300909U

CN215300909U - Sound production device

Info

Publication number: CN215300909U
Application number: CN202121386218.7U
Authority: CN
Inventors: 董献杰; 张龙
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd; AAC Microtech Changzhou Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd; AAC Microtech Changzhou Co Ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2021-12-24
Anticipated expiration: 2031-06-21

Abstract

The utility model provides a sounding device, it includes the basin frame, the magnetic circuit who is fixed in the basin frame and be located the relative both sides of magnetic circuit first vibration system and second vibration system respectively, magnetic circuit includes the magnetic bowl that is fixed in the basin frame and the main magnet steel and the secondary magnet steel that are fixed in the magnetic bowl respectively, the magnetic bowl includes the diapire, by the lateral wall of the week edge of diapire to the first vibration system direction bending extension and by the lateral wall keep away from the one end of diapire to the basin frame extension and be fixed in the support wall of basin frame, the main magnet steel is fixed in the lateral wall and is close to one side of first vibration system, the main magnet steel forms first magnetic gap with the lateral wall interval; the auxiliary magnetic steel is annular and is fixed on one side of the supporting wall close to the second vibration system, a second magnetic gap is formed between the auxiliary magnetic steel and the side wall at an interval, a first sound guide hole penetrating through the auxiliary magnetic steel is formed in the auxiliary magnetic steel along the vibration direction of the second vibration system, and a second sound guide hole communicated with the first sound guide hole is formed in the supporting wall. The utility model discloses a sound production device saves complete machine space and acoustic performance is more excellent.

Description

Sound production device

[ technical field ] A method for producing a semiconductor device

The utility model relates to an electroacoustic conversion field especially relates to a sounding device.

[ background of the invention ]

The sound generating device is one of main components of a mobile terminal such as a mobile phone and the like, and is mainly used for converting an electric signal into a sound signal.

The sound production device in the related art comprises a basin frame, a vibration system fixed on the basin frame and a magnetic circuit system with a magnetic gap, wherein the vibration system comprises a vibrating diaphragm fixed on the basin frame and used for vibrating and producing sound, and a voice coil inserted in the magnetic gap and used for driving the vibrating diaphragm to vibrate.

However, in the sound generating device of the related art, the sound generating device is usually made into two mutually independent cores, namely a bass unit and a treble unit, which form a pipeline respectively, or the sound generating device is made into a whole with a high-low sound unit, and the whole machine is additionally made into a pipeline to distinguish high and low sounds; therefore, the whole installation space of the sounding device is increased, and the user experience effect is poor.

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

[ Utility model ] content

An object of the utility model is to provide a save complete machine space, sound production device that acoustic performance is good.

In order to achieve the above object, the present invention provides a sound generating device, which includes a frame, a magnetic circuit fixed on the frame, and a first vibration system and a second vibration system respectively located on two opposite sides of the magnetic circuit, wherein the magnetic circuit includes a magnetic bowl fixed on the frame, and a main magnetic steel and an auxiliary magnetic steel respectively fixed on the magnetic bowl, the magnetic bowl includes a bottom wall, a side wall extending from the circumferential edge of the bottom wall to the first vibration system, and a supporting wall extending from one end of the side wall away from the bottom wall to the frame and fixed on the frame, the main magnetic steel is fixed on one side of the bottom wall close to the first vibration system, and a first magnetic gap is formed between the main magnetic steel and the side wall; the auxiliary magnetic steel is annular and is fixed on one side, close to the second vibration system, of the support wall, a second magnetic gap is formed between the auxiliary magnetic steel and the side wall at an interval, a first sound guide hole penetrating through the auxiliary magnetic steel is formed in the auxiliary magnetic steel along the vibration direction of the second vibration system, and a second sound guide hole communicated with the first sound guide hole is formed in the support wall;

the first vibration system comprises a first vibrating diaphragm and a first voice coil, the first vibrating diaphragm is supported and fixed on one side, away from the second vibration system, of the support wall, the first voice coil drives the first vibrating diaphragm to vibrate and sound, and the first voice coil is inserted into the first magnetic gap; the second sound guide hole is positioned on the outer side of the first vibrating diaphragm;

the second vibration system comprises a second vibrating diaphragm fixed on the basin frame and a second voice coil for driving the second vibrating diaphragm to vibrate and sound, and the second voice coil is inserted into the second magnetic gap.

Preferably, the magnetic circuit system further includes a sound pressure hole penetrating through the main magnetic steel and the bottom wall simultaneously in the vibration direction, and a damping member attached to the bottom wall and completely covering the sound pressure hole.

Preferably, the magnetic circuit system further comprises a main pole core fixed on one side of the main magnetic steel, which is far away from the bottom wall, and the main pole core is provided with a through hole communicated with the sound pressure hole.

Preferably, the side wall includes a first connecting portion annularly disposed on the main magnetic steel at a spacing, a bending portion bent from the first connecting portion in a direction away from the main magnetic steel, and a second connecting portion extending from the bending portion to the supporting wall and fixed to the supporting wall.

Preferably, one side of the support wall close to the first diaphragm is higher than one side of the second connecting portion close to the first diaphragm.

Preferably, the first diaphragm includes a first ring folding portion which is annular and opposite to the sidewall at an interval and a first dome fixed on the inner periphery of the first ring folding portion, and the outer periphery of the first ring folding portion is fixed on the support wall.

Preferably, the second diaphragm comprises a second annular flange part and a second spherical top fixed on the inner periphery of the second flange part, and the outer periphery of the second flange part is fixed on the basin stand.

Preferably, the magnetic circuit system further comprises an auxiliary pole core fixed to the auxiliary magnetic steel and far away from the support wall, the auxiliary pole core is fixed to the basin frame to support the auxiliary magnetic steel, and the auxiliary pole core is provided with a third sound guide hole communicated with the first sound guide hole.

Preferably, the sounder further comprises an upper cover fixed on the basin frame and a lower cover fixed below the basin frame, the outer periphery of the first flange part is further provided with a circular ring which is pressed and fixed on the first flange part, an annular flexible layer is fixedly stacked on the circular ring, the upper surface of the flexible layer abuts against the lower surface of the upper cover, and the outer periphery of the second flange part is pressed on the basin frame by the lower cover; the upper cover and the first vibration system are enclosed to form an upper front cavity, the upper cover is provided with a first upper sound-emitting hole for communicating the upper front cavity with the outside and a second upper sound-emitting hole arranged around the first upper sound-emitting hole, and the second upper sound-emitting hole communicates the second sound-guiding hole with the outside; the lower cover and the second vibration system enclose a lower front cavity, and the lower cover is provided with a lower sound emitting hole which communicates the lower front cavity with the outside.

Preferably, the sound production device further comprises a flexible circuit board, the flexible circuit board is arranged between the first vibrating diaphragm and the second vibrating diaphragm, and the flexible circuit board is electrically connected with the first voice coil and the second voice coil respectively and used for providing driving signals for the first voice coil and the second voice coil respectively; a mounting table and a positioning rod protruding outwards from the mounting table are further arranged on one side of the basin stand, a conductive piece is arranged at one end of the flexible circuit board in an extending mode, a positioning hole is formed in the center of the conductive piece, and the positioning hole is arranged on the positioning rod in a matched mode; and a plurality of contacts are uniformly distributed on the conductive piece.

Compared with the prior art, the sound production device of the utility model comprises a basin frame, a magnetic circuit fixed on the basin frame, and a first vibration system and a second vibration system which are respectively positioned at two opposite sides of the magnetic circuit, wherein the magnetic circuit comprises a magnetic bowl fixed on the basin frame, and a main magnetic steel and an auxiliary magnetic steel which are respectively fixed on the magnetic bowl, the magnetic bowl comprises a bottom wall, a side wall which is bent and extended from the peripheral edge of the bottom wall to the direction of the first vibration system, and a supporting wall which is extended from one end of the side wall far away from the bottom wall to the basin frame and fixed on the basin frame, the main magnetic steel is fixed at one side of the bottom wall close to the first vibration system, and a first magnetic gap is formed between the main magnetic steel and the side wall at interval; the auxiliary magnetic steel is annular and is fixed on one side, close to the second vibration system, of the support wall, a second magnetic gap is formed between the auxiliary magnetic steel and the side wall at an interval, a first sound guide hole penetrating through the auxiliary magnetic steel is formed in the auxiliary magnetic steel along the vibration direction of the second vibration system, and a second sound guide hole communicated with the first sound guide hole is formed in the support wall; the high-low sound unit is integrated in the single body, and meanwhile, the high-low sound channel is arranged in the body in a separated mode, so that the whole machine is not occupied, the pipeline communication is additionally carried out, the space is saved, and the acoustic performance is better.

[ description of the drawings ]

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

fig. 1 is a schematic perspective view of the sound device of the present invention;

fig. 2 is an exploded view of the sound device of the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 1;

fig. 4 is a schematic structural view of the sidewall of the present invention.

In the figure, 100, the sound generating device, 101, the upper cover, 102, the lower cover, 103, the upper front cavity, 104, the lower front cavity, 105, the first upper sound generating hole, 106, the second upper sound generating hole, 107, the lower sound generating hole, 1, the frame, 11, the positioning rod, 12, the mounting table, 2, the first vibration system, 21, the first diaphragm, 211, the first hinge part, 212, the first dome, 22, the first voice coil, 23, the ring, 24, the flexible layer, 3, the magnetic circuit system, 31, the magnetic bowl, 311, the bottom wall, 312, the side wall, 3121, the first connection part, 3122, the bending part, 3123, the second connection part, 313, the support wall, 32, the auxiliary pole core, 33, the main magnetic steel, 331, the sound pressure hole, 34, the auxiliary magnetic steel, 35, the main pole core, 351, the through hole, 36, the first magnetic gap, 37, the second magnetic gap, 38, the damping element, 4, the second vibration system, 41, the second hinge part, 412, 411, the second diaphragm, 411, the second top, 42. a second voice coil 5, a flexible circuit board 51, a conductive member 52, a contact 53, a positioning hole 6, a first sound guiding hole 7, a second sound guiding hole 8, a third sound guiding hole,

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a sound generating device 100, which includes a frame 1, a first vibration system 2, a magnetic circuit system 3, a second vibration system 4 and a flexible circuit board 5.

The magnetic circuit system 3 comprises a magnetic bowl 31 fixed on the frame 1, and a main magnetic steel 33 and an auxiliary magnetic steel 34 fixed on the magnetic bowl 31 respectively, the magnetic bowl 31 comprises a bottom wall 311, a side wall 312 bent and extended from the periphery of the bottom wall 311 to the first vibration system 2, and a support wall 313 extended from one end of the side wall 312 far away from the bottom wall 311 to the frame 1 and fixed on the frame 1, the main magnetic steel 33 is fixed on one side of the bottom wall 311 close to the first vibration system 2, and the main magnetic steel 33 and the side wall 312 form a first magnetic gap 36 at an interval; the auxiliary magnetic steel 34 is annular, and it is fixed in the support wall 313 is close to one side of the second vibration system 4, the auxiliary magnetic steel 34 with the lateral wall 312 interval forms the second magnetic gap 37, the auxiliary magnetic steel 34 is followed the vibration direction of the second vibration system 4 is equipped with the first sound conduction hole 6 that runs through on it, the support wall 313 be equipped with the second sound conduction hole 7 that the first sound conduction hole 6 communicates. The high-low sound unit is integrated in the single body, and meanwhile, the high-low sound channel is arranged in the body in a separated mode, so that the whole machine is not occupied, the pipeline communication is additionally carried out, the space is saved, and the acoustic performance is better.

The auxiliary magnetic steel 34 is arranged in an integral annular structure, and the first sound guide hole 6 penetrates through the auxiliary magnetic steel 34. The auxiliary magnetic steels 34 are arranged at intervals and jointly enclose an annular structure, and the first sound guide holes 6 are enclosed by two adjacent auxiliary magnetic steels 34 at intervals.

The bottom wall 311, the side wall 312, and the support wall 313 may be integrally formed, or may be separately formed, as long as the positions of the bottom wall 311, the side wall 312, and the support wall 313 in the generator are not changed, and the main magnet steel 33 and the first diaphragm 21 can be fixed.

The first vibration system 2 comprises a first diaphragm 21 supported and fixed on one side of the support wall 313 away from the second vibration system 4 and a first voice coil 22 driving the first diaphragm 21 to vibrate and sound, and the first voice coil 22 is inserted into the first magnetic gap 36; the second sound guide hole 7 is located outside the first diaphragm 21. The first diaphragm 21 is driven to vibrate by the first voice coil 22, so that the high frequency unit passes through the first sound conduction hole 6.

The second vibration system 4 comprises a second diaphragm 41 fixed on the frame 1 and a second voice coil 42 driving the second diaphragm 41 to vibrate and sound, and the second voice coil 42 is inserted into the second magnetic gap 37.

Specifically, this sound production device drives first vibrating diaphragm 21 vibration through first voice coil 22 sound production for high frequency sound switches on to the outside through first vibrating diaphragm 21, and the high frequency sound effect is good. The second diaphragm 41 is driven to vibrate by the second voice coil 42, so that the low-frequency sound is transmitted to the outside through the first sound guide hole 6 and the second sound guide hole 7 in sequence.

The flexible circuit board 5 is disposed between the first diaphragm 21 and the second diaphragm 41, and the flexible circuit board 5 is electrically connected to the first voice coil 22 and the second voice coil 42, respectively, so as to provide driving signals for the first voice coil 22 and the second voice coil 42, respectively.

Specifically, in the present embodiment, the magnetic circuit system 3 further includes a sound pressure hole 331 penetrating both the main magnetic steel 33 and the bottom wall 311 in the vibration direction, and a damper 38 attached to the bottom wall 311 and completely covering the sound pressure hole 331. A first sound-producing cavity is defined by the first vibrating diaphragm 21 and the magnetic bowl 31, and a second sound-producing cavity is defined by the second vibrating diaphragm 41, the auxiliary magnetic steel 34 and the basin frame 1. The sound pressure holes 331 are used for balancing the sound pressure of the two sounding inner cavities, and the ventilation size of the sound pressure holes 331 is adjusted through the damping piece 38, so that the sounding effect of the sounding device is better.

The magnetic circuit system 3 further includes a main pole core 35 fixed on one side of the main magnet steel 33 away from the bottom wall 311, and the main pole core 35 is provided with a through hole 351 communicated with the sound pressure hole 331.

One side of the support wall 313 close to the first diaphragm 21 is higher than one side of the second connection portion 3123 close to the first diaphragm 21. This facilitates the mounting and fixing of the first diaphragm 21 on the support wall 313.

The side wall 312 includes a first connection portion 3121 annularly disposed on the main magnet steel 33, a bent portion 3122 bent from the first connection portion 3121 in a direction approaching the support wall 313, and a second connection portion 3123 extending from the bent portion 3122 toward the support wall 313 and fixed to the support wall 313. Through fixing first connecting portion 3121 on the yoke, utilize first connecting portion 3121 ring to locate main magnet steel 33, make full use of space, the effectual sensitivity that promotes the sound production device, acoustic performance is more excellent. This bending portion 3122 is used for connecting first connecting portion 3121 and second connecting portion 3123, also is convenient for separate first magnetic gap 36 and second magnetic gap 37 simultaneously, makes things convenient for first voice coil 22 and second voice coil 42 to set up in corresponding first magnetic gap 36 and second magnetic gap 37, improves the vocal effect of first voice coil 22 and second voice coil 42.

The first diaphragm 21 includes a first ring-shaped folding portion 211 opposite to the sidewall 312 at an interval and a first dome 212 fixed on the inner periphery of the first ring-shaped folding portion 211, and the outer periphery of the first ring-shaped folding portion 211 is fixed on the support wall 313. The first dome 212 provided on the inner circumference of the first ring-folding portion 211 facilitates increasing the vibration effect of the first diaphragm 21 when the first voice coil 22 sounds, thereby improving the acoustic performance of the first voice coil 22.

The second diaphragm 41 includes a second annular flange portion 411 and a second dome 412 fixed on the inner periphery of the second flange portion 411, and the outer periphery of the second flange portion 411 is fixed on the frame 1. The second dome 412 disposed on the inner circumference of the second flange portion 411 facilitates increasing the vibration effect of the first diaphragm 21 when the second voice coil 42 sounds, thereby improving the acoustic performance of the second voice coil 42.

The magnetic circuit system 3 further comprises an auxiliary pole core 32 fixed on the auxiliary magnetic steel 34 far away from the supporting wall 313, the auxiliary pole core 32 is fixed on the basin frame 1 to support the auxiliary magnetic steel 34, and the auxiliary pole core 32 is provided with a third sound conduction hole 8 communicated with the first sound conduction hole 6. The magnetic force of the auxiliary magnetic steel 34 is enhanced by the auxiliary pole core 32, so that the second voice coil 42 produces sound under the magnetic force of the auxiliary magnetic steel 34, and the second diaphragm 41 vibrates to improve the bass sound emission effect. This sound loops through third sound conduction hole 8, first sound conduction hole 6 and second sound conduction hole 7 and transmits the outside for high bass unit is integrated in a monomer, and high bass passageway separates the setting in the body is inside simultaneously, does not account for the complete machine and additionally does the pipeline intercommunication, saves space, and acoustic performance is more excellent.

The sounder further comprises an upper cover 101 fixed on the basin frame 1 and a lower cover 102 fixed below the basin frame 1, wherein a circular ring 23 pressed and fixed on the first ring-folding part 211 is further arranged on the outer periphery of the first ring-folding part 211, an annular flexible layer 24 is fixedly overlapped on the circular ring 23, the upper surface of the flexible layer 24 abuts against the lower surface of the upper cover 101, and the outer periphery of the second ring-folding part 411 is pressed on the basin frame 1 by the lower cover 102; the upper cover 101 and the first vibration system 2 enclose an upper front cavity 103, the upper cover 101 is provided with a first upper sound-emitting hole 105 for communicating the upper front cavity 103 with the outside and a second upper sound-emitting hole 106 arranged around the first upper sound-emitting hole 105, and the second upper sound-emitting hole 106 communicates the second sound-guiding hole 7 with the outside; the lower cover 102 and the second vibration system 4 enclose a lower front cavity 104, and the lower cover 102 is provided with a lower sound emitting hole 107 for communicating the lower front cavity 104 with the outside.

The flexible layer may be a sponge layer or the like.

Specifically, the ring 23 is fixed to the outer peripheral edge of the first annular folding portion 211, thereby providing an effect of reinforcing the fixation. The annular flexible layer 24 is fixedly arranged on the circular ring 23, the upper surface of the flexible layer 24 is fixed on the lower surface of the upper cover 101, and the vibration effect of the first diaphragm 21 can be improved through the flexible layer 24. And the lower cover 102 presses the outer peripheral edge of the second flange part 411 on the basin frame 1, so that the second flange part 411 has better fixing effect, avoids sound production vibration deviation during working, and improves the acoustic performance of the sound production device.

A mounting table 12 and a positioning rod 11 protruding outwards from the mounting table 12 are further arranged on one side of the basin stand 1, a conductive piece 51 is arranged at one end of the flexible circuit board 5 in an extending mode, a positioning hole 53 is arranged in the center of the conductive piece 51, and the positioning hole 53 is arranged on the positioning rod 11 in a matching mode; the conductive member 51 is further uniformly distributed with a plurality of contacts 52. The conductive member 51 is convenient to mount and fix, and the plurality of contacts 52 are also convenient to control the main magnetic steel 33 and the auxiliary magnetic steel 34 to respectively drive the first voice coil 22 and the second voice coil 42 to generate sound, so that the control effect is good.

The positioning rod 11 is arranged at the geometric center of the mounting table 12, and the positioning hole 53 arranged at the geometric center of the conductive member 51 is matched and fixedly connected with the positioning rod 11, so that the conductive member 51 is fixed on the mounting table 12, and the operation is convenient.

Further, the plurality of contacts 52 includes four contacts 52, and the four contacts 52 are uniformly distributed on the periphery of the positioning hole 53.

Compared with the prior art, the sound production device of the present invention comprises a frame 1, a magnetic circuit system 3 fixed on the frame 1, and a first vibration system 2 and a second vibration system 4 respectively located on two opposite sides of the magnetic circuit system 3, wherein the magnetic circuit system 3 comprises a magnetic bowl 31 fixed on the frame 1, and a main magnet steel 33 and an auxiliary magnet steel 34 respectively fixed on the magnetic bowl 31, the magnetic bowl 31 comprises a bottom wall 311, a side wall 312 bent and extended from the circumferential edge of the bottom wall 311 toward the first vibration system 2, and a supporting wall 313 extended and fixed on the frame 1 from one end of the side wall 312 far away from the bottom wall 311 toward the frame 1, the main magnet steel 33 is fixed on one side of the bottom wall 311 close to the first vibration system 2, and a first magnetic gap 36 is formed between the main magnet steel 33 and the side wall 312; the auxiliary magnetic steel 34 is annular and fixed on one side of the supporting wall 313 close to the second vibration system 4, a second magnetic gap 37 is formed between the auxiliary magnetic steel 34 and the side wall 312 at an interval, the auxiliary magnetic steel 34 is provided with a first sound guide hole 6 penetrating through the auxiliary magnetic steel along the vibration direction of the second vibration system 4, and the supporting wall 313 is provided with a second sound guide hole 7 communicated with the first sound guide hole 6; the high-low sound unit is integrated in the single body, and meanwhile, the high-low sound channel is arranged in the body in a separated mode, so that the whole machine is not occupied, the pipeline communication is additionally carried out, the space is saved, and the acoustic performance is better.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims

1. A sound production device comprises a basin frame, a magnetic circuit system fixed on the basin frame, and a first vibration system and a second vibration system which are respectively positioned on two opposite sides of the magnetic circuit system, and is characterized in that the magnetic circuit system comprises a magnetic bowl fixed on the basin frame, and a main magnetic steel and an auxiliary magnetic steel which are respectively fixed on the magnetic bowl, wherein the magnetic bowl comprises a bottom wall, a side wall which is bent and extended from the circumferential edge of the bottom wall to the direction of the first vibration system, and a supporting wall which is extended from one end of the side wall far away from the bottom wall to the basin frame and fixed on the basin frame, the main magnetic steel is fixed on one side of the bottom wall close to the first vibration system, and a first magnetic gap is formed between the main magnetic steel and the side wall at intervals; the auxiliary magnetic steel is annular and is fixed on one side, close to the second vibration system, of the support wall, a second magnetic gap is formed between the auxiliary magnetic steel and the side wall at an interval, a first sound guide hole penetrating through the auxiliary magnetic steel is formed in the auxiliary magnetic steel along the vibration direction of the second vibration system, and a second sound guide hole communicated with the first sound guide hole is formed in the support wall;

2. The sound production device of claim 1, wherein: the magnetic circuit system also comprises a sound pressure hole and a damping piece, wherein the sound pressure hole penetrates through the main magnetic steel and the bottom wall along the vibration direction, and the damping piece is attached to the bottom wall and completely covers the sound pressure hole.

3. The sound production device of claim 2, wherein: the magnetic circuit system further comprises a main pole core fixed on one side, far away from the bottom wall, of the main magnetic steel, and the main pole core is provided with a through hole communicated with the sound pressure hole.

4. The sound production device of claim 3, wherein: the side wall comprises a first connecting part annularly arranged on the main magnetic steel at intervals, a bending part bent from the first connecting part to the direction far away from the main magnetic steel, and a second connecting part extending from the bending part to the supporting wall and fixed on the supporting wall.

5. The sound production device of claim 4, wherein: one side of the support wall close to the first diaphragm is higher than one side of the second connecting part close to the first diaphragm.

6. The sound production device of claim 1, wherein: first vibrating diaphragm including be annular and with the relative first ring portion of rolling over of lateral wall interval with be fixed in first bulb on the internal periphery of first ring portion of rolling over, the external periphery of first ring portion of rolling over is fixed in on the support wall.

7. The sound production device of claim 6, wherein: the second vibrating diaphragm comprises a second annular flange part and a second spherical top fixed on the inner periphery of the second flange part, and the outer periphery of the second flange part is fixed on the basin frame.

8. The sound production device of claim 1, wherein: the magnetic circuit system further comprises an auxiliary pole core fixed on the auxiliary magnetic steel and far away from the supporting wall, the auxiliary pole core is fixed on the basin frame to support the auxiliary magnetic steel, and a third sound conduction hole communicated with the first sound conduction hole is formed in the auxiliary pole core.

9. The sound production device of claim 7, wherein: the sounder further comprises an upper cover fixed on the basin frame and a lower cover fixed below the basin frame, a circular ring fixed on the first flange portion in a pressing mode is further arranged on the outer periphery of the first flange portion, an annular flexible layer is fixedly stacked on the circular ring, the upper surface of the flexible layer abuts against the lower surface of the upper cover, and the outer periphery of the second flange portion is pressed on the basin frame by the lower cover; the upper cover and the first vibration system are enclosed to form an upper front cavity, the upper cover is provided with a first upper sound-emitting hole for communicating the upper front cavity with the outside and a second upper sound-emitting hole arranged around the first upper sound-emitting hole, and the second upper sound-emitting hole communicates the second sound-guiding hole with the outside; the lower cover and the second vibration system enclose a lower front cavity, and the lower cover is provided with a lower sound emitting hole which communicates the lower front cavity with the outside.

10. The sound production device of claim 1, wherein: the sound production device further comprises a flexible circuit board, the flexible circuit board is arranged between the first vibrating diaphragm and the second vibrating diaphragm, and the flexible circuit board is electrically connected with the first voice coil and the second voice coil respectively and used for providing driving signals for the first voice coil and the second voice coil respectively; a mounting table and a positioning rod protruding outwards from the mounting table are further arranged on one side of the basin stand, a conductive piece is arranged at one end of the flexible circuit board in an extending mode, a positioning hole is formed in the center of the conductive piece, and the positioning hole is arranged on the positioning rod in a matched mode; and a plurality of contacts are uniformly distributed on the conductive piece.