CN213462287U

CN213462287U - Sound production device

Info

Publication number: CN213462287U
Application number: CN202022223338.7U
Authority: CN
Inventors: 宋威; 令狐荣林; 肖波; 章统; 孔晨亮
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-06-15
Anticipated expiration: 2030-09-30
Also published as: WO2022068002A1

Abstract

The utility model provides a sounding device, which comprises a vibration system and a magnetic circuit system with a magnetic gap for driving the vibration system to sound; the vibration system comprises a vibrating diaphragm and a voice coil inserted in the magnetic gap to drive the vibrating diaphragm to vibrate and produce sound; the magnetic circuit system comprises a magnetic yoke, a main magnetic steel and a first auxiliary magnetic steel, wherein the main magnetic steel and the first auxiliary magnetic steel are fixed on the magnetic yoke, the main magnetic steel and the first auxiliary magnetic steel are spaced and jointly enclose a magnetic gap, and the first auxiliary magnetic steel comprises two magnetic steels which are respectively positioned on two opposite sides of the main magnetic steel; the main magnetic steel comprises an upper main magnetic steel, a main pole core and a lower main magnetic steel which are sequentially stacked along the vibration direction of the vibrating diaphragm, and the lower main magnetic steel is fixed on the magnetic yoke. The utility model provides two kinds of sound production devices, the main magnet steel of two kinds of sound production devices include the last main magnet steel, main pole core and the lower main magnet steel of establishing of folding in proper order along the vibration direction of vibrating diaphragm, and lower main magnet steel is fixed in the yoke. Compared with the prior art, the utility model discloses a sensitivity of vocal device is high and acoustic performance is good.

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 an apply to vocal device of electron audio amplifier product.

[ background of the invention ]

With the advent of the mobile internet age, the number of smart mobile devices is increasing. Among the mobile devices, the mobile phone is undoubtedly the most common and portable mobile terminal device. At present, the functions of mobile phones are very diverse, one of them is a high-quality music function, and therefore, a sound generating device for playing sound is widely applied to the current smart mobile devices.

The sound production device of the related art includes a frame, and a vibration system and a magnetic circuit system having a magnetic gap, which are respectively fixed to the frame. The vibration system comprises a vibrating diaphragm fixed on the basin frame, a voice coil fixed on the vibrating diaphragm and inserted in the magnetic gap to drive the vibrating diaphragm to vibrate and produce sound. The magnetic circuit system comprises a magnetic yoke, main magnetic steel fixed on the magnetic yoke and first auxiliary magnetic steel which is annularly arranged on the main magnetic steel and forms the magnetic gap with the main magnetic steel at intervals, wherein the first auxiliary magnetic steel comprises two magnetic steel bodies which are respectively positioned on two opposite sides of the main magnetic steel body.

However, in the sound generating device of the related art, in order to better enhance the driving capability of the magnetic circuit system, the thickness of the main magnetic steel is increased along the vibration direction of the diaphragm, and the depth of the magnetic gap is the thickness of the main magnetic steel, so that the moving height of the voice coil in the magnetic gap is limited by the thickness of the main magnetic steel, thereby causing the sensitivity of the sound generating device to be low.

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 sensitivity is high and acoustic performance is good sounder.

In order to achieve the above object, the present invention provides a sound generating device, which includes a vibration system and a magnetic circuit system with a magnetic gap for driving the vibration system to generate sound; the vibration system comprises a vibrating diaphragm and a voice coil which is inserted into the magnetic gap to drive the vibrating diaphragm to vibrate and sound; the magnetic circuit system comprises a magnetic yoke, a main magnetic steel and a first auxiliary magnetic steel, wherein the main magnetic steel and the first auxiliary magnetic steel are fixed on the magnetic yoke, the main magnetic steel and the first auxiliary magnetic steel are spaced and jointly enclose a magnetic gap, and the first auxiliary magnetic steel comprises two magnetic steels which are respectively positioned on two opposite sides of the main magnetic steel; the main magnetic steel comprises an upper main magnetic steel, a main pole core and a lower main magnetic steel which are sequentially stacked along the vibration direction of the vibrating diaphragm, and the lower main magnetic steel is fixed on the magnetic yoke; the first auxiliary magnetic steel comprises a first upper auxiliary magnetic steel, a first auxiliary pole core and a first lower auxiliary magnetic steel which are sequentially stacked along the vibration direction of the vibrating diaphragm, and the first lower auxiliary magnetic steel is fixed on the magnetic yoke.

Preferably, along the vibration direction of the diaphragm, the projection of the upper main magnetic steel to the magnetic yoke, the projection of the main pole core to the magnetic yoke, and the projection of the lower main magnetic steel to the magnetic yoke are completely overlapped; along the vibration direction of the vibrating diaphragm, the projection of the first upper auxiliary magnetic steel to the magnetic yoke, the projection of the first auxiliary pole core to the magnetic yoke and the projection of the first lower auxiliary magnetic steel to the magnetic yoke are completely overlapped.

Preferably, the magnetic circuit system further comprises a first main clamping plate, and the first upper auxiliary magnetic steel and the upper main magnetic steel are both fixed on one side of the first main clamping plate close to the magnetic yoke.

Preferably, a side surface of the first upper auxiliary magnetic steel far away from the magnetic yoke is flush with a side surface of the upper main magnetic steel far away from the magnetic yoke.

The utility model also provides a sound production device of any one above, main magnet steel is the rectangle, two first pair magnet steel are located respectively the major axis of main magnet steel is relative both sides, magnetic circuit still includes two second pair magnet steel that are located respectively the minor axis of main magnet steel is relative both sides, main magnet steel respectively with first pair magnet steel and second pair magnet steel interval and enclose jointly the magnetic gap; the vice magnet steel of second includes follows vice magnet steel, the vice utmost point core of second and the vice magnet steel of second under the vibration direction of vibrating diaphragm folds in proper order establishes, vice magnet steel is fixed in under the second the yoke.

Preferably, along the vibration direction of the diaphragm, the projection of the second lower auxiliary magnetic steel to the magnetic yoke and the projection of the second auxiliary pole core to the magnetic yoke are completely overlapped.

Preferably, the projection of the second upper auxiliary magnetic steel to the magnetic yoke completely falls into the projection range of the second auxiliary pole core to the magnetic yoke.

Preferably, the magnetic circuit system further comprises a third main plate, the upper main magnetic steel is fixed on one side of the third main plate close to the magnetic yoke, and the first upper auxiliary magnetic steel and the second upper auxiliary magnetic steel are respectively arranged at intervals with the third main plate.

The utility model also provides a sounding device, which comprises a vibration system and a magnetic circuit system with a magnetic gap for driving the vibration system to sound; the vibration system comprises a vibrating diaphragm and a voice coil which is inserted into the magnetic gap to drive the vibrating diaphragm to vibrate and sound; the magnetic circuit system comprises a magnetic yoke, and a main magnetic steel, a first auxiliary magnetic steel and a second auxiliary magnetic steel which are respectively fixed on the magnetic yoke, wherein the main magnetic steel is respectively spaced from the first auxiliary magnetic steel and the second auxiliary magnetic steel and jointly forms a magnetic gap, the main magnetic steel is rectangular, the first auxiliary magnetic steel comprises two magnetic steels and is respectively positioned at two opposite sides of a long axis of the main magnetic steel, the second auxiliary magnetic steel comprises two magnetic steels and is respectively positioned at two opposite sides of a short axis of the main magnetic steel, the main magnetic steel comprises an upper main magnetic steel, a main pole core and a lower main magnetic steel which are sequentially stacked along the vibration direction of the vibrating diaphragm, and the lower main magnetic steel is fixed on the magnetic yoke; the first auxiliary magnetic steel and the second auxiliary magnetic steel are made of single magnetic steel.

Preferably, magnetic circuit still includes the second main splint, the second main splint is located including folding the splint body of last main magnet steel, by the splint body to the first connecting portion of the direction bending extension of first pair magnet steel, by first connecting portion bending extension just folds and locates the first pair splint of first pair magnet steel, by the splint body to the second connecting portion of the direction bending extension of the second pair magnet steel and by the second connecting portion bending extension just folds and locates the second pair splint of the second pair magnet steel.

Compared with the prior art, the sound production device of the utility model is provided with the main magnetic steel fixed on the magnetic yoke and two first auxiliary magnetic steels arranged on the peripheral side of the main magnetic steel, and the two first auxiliary magnetic steels are respectively positioned on the two opposite sides of the main magnetic steel; meanwhile, the main magnetic steel comprises an upper main magnetic steel, a main pole core and a lower main magnetic steel which are sequentially stacked along the vibration direction of the vibrating diaphragm; and the first auxiliary magnetic steel comprises a first upper auxiliary magnetic steel, a first auxiliary pole core and a first lower auxiliary magnetic steel which are sequentially stacked along the vibration direction of the vibrating diaphragm. The structure stroke six-magnetic-circuit structure is characterized in that a main magnetic steel is split into an upper main magnetic steel and a lower main magnetic steel, the depth of a magnetic gap is increased through a main pole core, meanwhile, an auxiliary magnetic steel is also split into an upper auxiliary magnetic steel and a lower auxiliary magnetic steel, and the depth of the magnetic gap is increased through an auxiliary pole core; the depth of the formed magnetic gap is the sum of the thicknesses of the upper main magnetic steel, the main pole core and the lower main magnetic steel, so that the driving force of a magnetic circuit space is ensured, the movement range of the voice coil in the magnetic gap is wide, the sensitivity of the sound production device is high, and the acoustic performance of the sound production device is excellent. The utility model discloses still provide another kind of sound production device, this sound production device is on the basis of above-mentioned sound production device, increases the vice magnet steel of two seconds that sets up in the other relative both sides of main magnet steel to include the vice magnet steel of second along the vibration direction of vibrating diaphragm is folded vice magnet steel, the vice utmost point core of second and the vice magnet steel under the second of establishing in proper order. The structure forms a ten-magnetic-circuit structure, and the structure also ensures the driving force of a magnetic circuit space, and simultaneously ensures that the voice coil has wide movement range in a magnetic gap, so that the sensitivity of the sound production device is high, and the acoustic performance of the sound production device is excellent. The utility model also provides another sound production device, the magnetic circuit system of the sound production device comprises a main magnetic steel, two first auxiliary magnetic steels which are respectively arranged at two opposite sides of the main magnetic steel and two second auxiliary magnetic steels which are respectively arranged at the other two opposite sides of the main magnetic steel, the main magnetic steel comprises an upper main magnetic steel, a main pole core and a lower main magnetic steel which are sequentially overlapped along the vibration direction of the vibrating diaphragm; the first auxiliary magnetic steel and the second auxiliary magnetic steel are made of single magnetic steel. The structure forms a six-magnetic-circuit structure, and the structure also ensures the driving force of a magnetic circuit space, and simultaneously ensures that the voice coil has a wide movement range in a magnetic gap, so that the sensitivity of the sound production device is high, and the acoustic performance of the sound production device is excellent.

[ 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 a part of the three-dimensional structure 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 view of an assembled three-dimensional structure of the voice coil and the magnetic circuit system of the sound device of the present invention;

FIG. 5 is an exploded view of the partial perspective structure of FIG. 4;

fig. 6 is a schematic perspective view of another embodiment of the sound device of the present invention;

fig. 7 is a schematic assembled perspective view of another embodiment of the sound device of the present invention;

fig. 8 is an exploded view of a part of a three-dimensional structure of another embodiment of the sound device of the present invention;

fig. 9 is a schematic perspective view of another embodiment of the sound device of the present invention;

fig. 10 is a schematic assembled perspective view of another embodiment of the sound device of the present invention;

fig. 11 is an exploded view of a part of a three-dimensional structure of another embodiment of the sound generating device of the present invention.

[ 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. 1-5, the present invention provides a sound generating device 100, which includes a basin frame 1, a vibration system 2 and a magnetic circuit system 3 respectively supported on the basin frame 1, 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 generate sound.

The basin stand 1 is used for fixing the vibration system 2 and the magnetic circuit system 3.

The vibration system 2 comprises a diaphragm 21 and a voice coil 22 inserted in the magnetic gap 30 to drive the diaphragm 21 to vibrate and generate sound.

The magnetic circuit system 3 includes a magnetic yoke 31, and a main magnetic steel 32 and a first sub magnetic steel 33 fixed to the magnetic yoke 31.

The yoke 31 and the diaphragm 21 are respectively disposed on two opposite sides of the sound generating device 100.

The main magnetic steel 32 and the first sub magnetic steel 33 are spaced and jointly enclose the magnetic gap 30. Specifically, the main magnetic steel 32 includes an upper main magnetic steel 321, a main pole core 322, and a lower main magnetic steel 323 sequentially stacked along the vibration direction of the diaphragm 21. Wherein, the lower main magnetic steel 323 is fixed to the yoke 31. In the structure, the main magnetic steel 323 is provided as two magnetic steels, namely an upper main magnetic steel 321 and a lower main magnetic steel 323, and the two magnetic steels are provided to increase the driving force of the magnetic lines of force of the magnetic gap 30, so that the magnetic lines of force of the magnetic circuit system 3 are cut by the voice coil 22 as much as possible to form a larger driving force magnetic circuit space. In addition, the depth of the magnetic gap 30 is increased through the main pole core 322, that is, the depth of the formed magnetic gap 30 is the sum of the thicknesses of the three parts of the upper main magnetic steel 321, the main pole core 322 and the lower main magnetic steel 323, so that the driving force of the magnetic lines of force of the magnetic gap 30 is ensured, the moving range of the voice coil 22 in the magnetic gap 30 is wide, the sensitivity of the sound generating device 100 is high, and the acoustic performance of the sound generating device 100 is excellent.

In this embodiment, along the vibration direction of the diaphragm 21, the projection of the upper main magnet steel 321 to the yoke 31, the projection of the main pole core 322 to the yoke 31, and the projection of the lower main magnet steel 323 to the yoke 31 completely overlap. This configuration allows the primary magnet 32 to be formed as a unitary structure to provide a more uniform magnetic field within the magnetic gap 30, while also being easier to manufacture and assemble.

The first secondary magnetic steel 33 includes two secondary magnetic steels respectively located at two opposite sides of the primary magnetic steel 32.

In this embodiment, the first auxiliary magnetic steel 33 includes a first upper auxiliary magnetic steel 331, a first auxiliary pole core 332, and a first lower auxiliary magnetic steel 333, which are sequentially stacked in the vibration direction of the diaphragm 21. The first lower auxiliary magnetic steel 333 is fixed to the yoke 31. The structure forms a six-magnetic-circuit structure, and the first secondary magnetic steel 33 and the primary magnetic steel 32 are completely matched in height, so that the formed magnetic field in the magnetic gap 30 is more balanced, the driving force of the magnetic lines of force of the magnetic gap 30 is ensured, and the moving range of the voice coil 22 in the magnetic gap 30 is wide.

Preferably, along the vibration direction of the diaphragm 21, the projection of the first upper auxiliary magnetic steel 331 to the magnetic yoke 31, the projection of the first auxiliary pole core 332 to the magnetic yoke 31, and the projection of the first lower auxiliary magnetic steel 333 to the magnetic yoke 31 completely overlap. This configuration allows the first secondary pole core 332 to be formed as a unitary structure to provide more uniform magnetic fields within the magnetic gap 30, while being easier to manufacture and assemble.

In this embodiment, a surface of the first upper auxiliary magnetic steel 331 away from the magnetic yoke 31 is flush with a surface of the upper main magnetic steel 321 away from the magnetic yoke 31. This configuration makes the magnetic field in the magnetic gap 30 more uniform, while also facilitating the mounting and securing of the clamping plates for increasing the magnetic field lines. On the basis of this structure, the magnetic circuit system 3 further includes a first main plate 34, and the first upper auxiliary magnetic steel 331 and the upper main magnetic steel 321 are both fixed to a side of the first main plate 34 close to the magnetic yoke 31. The arrangement of the first main clamping plate 34 increases the magnetic field intensity of the magnetic gap 30 formed by the main magnetic steel 32 and the first auxiliary magnetic steel 33, so that the sensitivity of the sound generating device 100 is high, and the acoustic performance of the sound generating device 100 is excellent.

Referring to fig. 6-8, the present invention provides a sound generating device 200, wherein the sound generating device 200 is formed by adding two magnetic steels on the basis of the sound generating device 100 to form a ten-magnetic circuit structure. The structure is changed from a six-magnetic-circuit structure to a ten-magnetic-circuit structure. The main magnet 32b is rectangular. The two first secondary magnetic steels 33b are respectively located on two opposite sides of the long axis of the main magnetic steel 32 b. The magnetic circuit system 3b further includes two second secondary magnetic steels 37b respectively located on two opposite sides of the minor axis of the main magnetic steel 32 b. This structure makes the magnetic path spaces on both sides of the major axis and the minor axis of the main magnet 32b utilized, so that the volume of the magnetic gap 30b is increased and the magnetic field in the magnetic gap 30b is more uniform.

Specifically, the first auxiliary magnetic steel 33b includes a first upper auxiliary magnetic steel 331b, a first auxiliary pole core 332b, and a first lower auxiliary magnetic steel 333b, which are sequentially stacked along the vibration direction of the diaphragm 21, and the first lower auxiliary magnetic steel 333b is fixed to the magnetic yoke 31 b. The second auxiliary magnetic steel 37b includes a second upper auxiliary magnetic steel 371b, a second auxiliary pole core 372b and a second lower auxiliary magnetic steel 373b, which are sequentially stacked along the vibration direction of the diaphragm 21, and the second lower auxiliary magnetic steel 373b is fixed to the magnetic yoke 31 b.

In the embodiment of the sound generator 200, along the vibration direction of the diaphragm 21, the projection of the second lower auxiliary magnetic steel 373b onto the magnetic yoke 31b and the projection of the second auxiliary pole core 372b onto the magnetic yoke 31b completely overlap. This structure enables the second lower auxiliary magnetic steel 373b and the second auxiliary pole core 372b to form an integral structure, so that the magnetic field in the magnetic gap 30b is more uniform, and at the same time, the manufacture and assembly are easier.

In order to match the components of the sound generator 200 for convenient installation, the projection of the second upper auxiliary magnetic steel 371b to the magnetic yoke 31b completely falls into the projection range of the second auxiliary pole core 372b to the magnetic yoke. This configuration makes the first secondary magnet 33b more flexible in construction, easy to install and can make the magnetic field in the magnetic gap 30b more uniform, while being easier to manufacture and assemble.

Of course, according to the structure of the first secondary magnetic steel 33b and the second secondary magnetic steel 37 b. The magnetic circuit system 3 includes a third main plate 36, i.e., the second main plate 35 is replaced with the third main plate 36. Specifically, the upper main magnetic steel 321b is fixed to a side of the third main plate 36 close to the magnetic yoke 31b, and the first upper auxiliary magnetic steel 331b and the second upper auxiliary magnetic steel 371b are respectively disposed at an interval from the third main plate 36. The third main clamping plate 36 is arranged to increase the magnetic field intensity of the magnetic gap 30b formed by the main magnetic steel 32b and the first and second auxiliary

magnetic steels

33b and 37b, so that the sensitivity of the sounding device is high, and the acoustic performance of the sounding device is excellent.

In summary, the sound-generating device 200 has a ten-magnetic-circuit structure, which also ensures the driving force of the magnetic circuit space, and makes the voice coil 22 have a wide range of motion in the magnetic gap 30b, so that the sound-generating device 200 has high sensitivity, and the sound-generating device 200 has excellent acoustic performance.

Referring to fig. 9-11, the present invention provides a sound generating device 300, wherein the sound generating device 300 is different from the sound generating device 200 in that the first auxiliary magnetic steel and the second auxiliary magnetic steel are different from each other, and the sound generating device 300 forms a six-magnetic circuit structure. Specifically, the main magnet 32a is rectangular. The two first secondary magnetic steels 33a are respectively located on two opposite sides of the long axis of the main magnetic steel 32 a. The magnetic circuit system 3a further includes two second secondary magnetic steels 37a respectively located on two opposite sides of the minor axis of the main magnetic steel 32 a. The main magnet 32a is spaced from the first sub magnet 33a and the second sub magnet 37a respectively and encloses the magnetic gap 30a together. This structure makes the magnetic path spaces on both sides of the major axis and the minor axis of the main magnet 32 utilized, so that the volume of the magnetic gap 30a is increased and the magnetic field in the magnetic gap 30 is more uniform.

In the embodiment of the sound generating device 300, the first secondary magnetic steel 33a and the second secondary magnetic steel 37a are made of a single magnetic steel. This structure forms another six-magnetic-circuit structure, and in order to ensure the uniform shape and large volume of the magnetic gap 30a, the magnetic circuit system 3a further includes a second main plate 35. The first main plate 34 of the sounder device 200 is replaced with the second main plate 35. Specifically, the second main plate 35 includes a plate body 351 stacked on the upper main magnet 321a, a first connecting portion 352 bent and extended in the direction of the first sub magnet 33a by the plate body 351, a first sub plate 353 bent and extended in the direction of the first sub magnet 33a by the first connecting portion 352, a second connecting portion 354 bent and extended in the direction of the second sub magnet 37a by the plate body 351, and a second sub plate 355 bent and extended in the direction of the second sub magnet 37a by the second connecting portion 354 and stacked on the second sub magnet 37 a. The second main clamping plate 35 is arranged to increase the magnetic field intensity of the magnetic gap 30a formed by the main magnetic steel 32a and the first and second auxiliary

magnetic steels

33a and 37a, so that the sensitivity of the sounding device is high, and the acoustic performance of the sounding device is excellent.

In summary, the structure of the sound generating device 300 forms another six-magnetic circuit structure, which also ensures the driving force of the magnetic circuit space, and makes the voice coil 22 have a wide range of motion in the magnetic gap 30a, so that the sensitivity of the sound generating device 300 is high, and the acoustic performance of the sound generating device 300 is excellent.

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 vibration system and a magnetic circuit system with a magnetic gap for driving the vibration system to produce sound; the vibration system comprises a vibrating diaphragm and a voice coil which is inserted into the magnetic gap to drive the vibrating diaphragm to vibrate and sound; the magnetic circuit system comprises a magnetic yoke, a main magnetic steel and a first auxiliary magnetic steel, wherein the main magnetic steel and the first auxiliary magnetic steel are fixed on the magnetic yoke, the main magnetic steel and the first auxiliary magnetic steel are spaced and jointly enclose a magnetic gap, and the first auxiliary magnetic steel comprises two magnetic steels which are respectively positioned on two opposite sides of the main magnetic steel; the main magnetic steel comprises an upper main magnetic steel, a main pole core and a lower main magnetic steel which are sequentially stacked along the vibration direction of the vibrating diaphragm, and the lower main magnetic steel is fixed on the magnetic yoke; the first auxiliary magnetic steel comprises a first upper auxiliary magnetic steel, a first auxiliary pole core and a first lower auxiliary magnetic steel which are sequentially stacked along the vibration direction of the vibrating diaphragm, and the first lower auxiliary magnetic steel is fixed on the magnetic yoke.

2. The sounding device according to claim 1, wherein along the vibration direction of the diaphragm, the projection of the upper main magnetic steel to the yoke, the projection of the main pole core to the yoke, and the projection of the lower main magnetic steel to the yoke completely coincide; along the vibration direction of the vibrating diaphragm, the projection of the first upper auxiliary magnetic steel to the magnetic yoke, the projection of the first auxiliary pole core to the magnetic yoke and the projection of the first lower auxiliary magnetic steel to the magnetic yoke are completely overlapped.

3. The sounding device as claimed in claim 1, wherein the magnetic circuit system further comprises a first main plate, and the first upper secondary magnetic steel and the upper main magnetic steel are fixed on a side of the first main plate close to the yoke.

4. The sound production device of claim 3, wherein a side surface of the first upper secondary steel away from the yoke is flush with a side surface of the upper primary steel away from the yoke.

5. The sound-producing device as claimed in any one of claims 1 to 4, wherein the main magnetic steel is rectangular, two first secondary magnetic steels are respectively located on opposite sides of the long axis of the main magnetic steel, the magnetic circuit system further comprises two second secondary magnetic steels respectively located on opposite sides of the short axis of the main magnetic steel, and the main magnetic steel is respectively spaced from the first secondary magnetic steel and the second secondary magnetic steel and jointly encloses the magnetic gap; the vice magnet steel of second includes follows vice magnet steel, the vice utmost point core of second and the vice magnet steel of second under the vibration direction of vibrating diaphragm folds in proper order establishes, vice magnet steel is fixed in under the second the yoke.

6. The sounding device according to claim 5, wherein along the vibration direction of the diaphragm, the projection of the second lower auxiliary magnetic steel to the yoke and the projection of the second auxiliary pole core to the yoke are completely coincident.

7. The sounder device according to claim 6, wherein a projection of the second upper secondary magnetic steel onto the yoke falls completely within a projection of the second secondary pole core onto the yoke.

8. The sounding device as claimed in claim 5, wherein the magnetic circuit system further comprises a third main plate, the upper main magnetic steel is fixed to a side of the third main plate close to the magnetic yoke, and the first upper auxiliary magnetic steel and the second upper auxiliary magnetic steel are respectively spaced from the third main plate.

9. A sound production device comprises a vibration system and a magnetic circuit system with a magnetic gap for driving the vibration system to produce sound; the vibration system comprises a vibrating diaphragm and a voice coil which is inserted into the magnetic gap to drive the vibrating diaphragm to vibrate and sound; the magnetic circuit system comprises a magnetic yoke, and a main magnetic steel, a first auxiliary magnetic steel and a second auxiliary magnetic steel which are respectively fixed on the magnetic yoke, wherein the main magnetic steel is respectively spaced from the first auxiliary magnetic steel and the second auxiliary magnetic steel and jointly forms a magnetic gap; the first auxiliary magnetic steel and the second auxiliary magnetic steel are made of single magnetic steel.

10. The sounding device according to claim 9, wherein the magnetic circuit system further comprises a second main board, the second main board comprises a board body stacked on the upper main magnetic steel, a first connecting portion extending from the board body in a bending manner toward the first auxiliary magnetic steel, a first auxiliary board extending from the first connecting portion in a bending manner and stacked on the first auxiliary magnetic steel, a second connecting portion extending from the board body in a bending manner toward the second auxiliary magnetic steel, and a second auxiliary board extending from the second connecting portion in a bending manner and stacked on the second auxiliary magnetic steel.