阅读说明：本技术 一种发声装置 (Sound production device ) 是由 金鑫 张帆 钟志威 于 2020-12-18 设计创作，主要内容包括：本发明提供了一种发声装置,包括盆架和固接于所述盆架的振动系统和磁路系统,所述振动系统包括振膜和驱动所述振膜振动的音圈,所述振膜包括球顶、位于所述球顶外周的主音膜以及支撑所述球顶和所述主音膜的骨架,所述骨架具有与球顶连接的第一连接部和自所述第一连接部的外周缘沿所述发声装置的振动方向朝所述磁路系统弯折延伸的第二连接部,所述第一连接部具有沿所述发声装置的振动方向相反设置的第一表面和第二表面,所述第一表面远离所述磁路系统,所述球顶包括与所述第二表面层叠设置的主体部和自所述主体部朝所述音圈延伸、并与所述音圈抵接的限位部。本发明的发声装置可以简化装配流程。(The invention provides a sound production device, which comprises a basin frame, a vibration system and a magnetic circuit system which are fixedly connected with the basin frame, the vibration system comprises a vibration diaphragm and a voice coil for driving the vibration diaphragm to vibrate, the vibration diaphragm comprises a ball top, a main sound film positioned on the periphery of the ball top and a framework for supporting the ball top and the main sound film, the framework is provided with a first connecting part connected with the top of the ball and a second connecting part bent and extended from the outer periphery of the first connecting part along the vibration direction of the sound generating device towards the magnetic circuit system, the first connecting part has a first surface and a second surface which are oppositely arranged along the vibration direction of the sound generating device, the magnetic circuit system is kept away from to the first surface, and the dome includes the main part with the second surface range upon range of setting and follow the main part extends towards the voice coil loudspeaker voice coil, and with the spacing portion of voice coil loudspeaker voice coil butt. The sound production device can simplify the assembly process.)

1. A sound-producing device, which comprises a basin frame, a vibration system and a magnetic circuit system which are fixedly connected with the basin frame, the vibration system comprises a vibration diaphragm and a voice coil for driving the vibration diaphragm to vibrate, the vibration diaphragm comprises a ball top, a main sound film positioned on the periphery of the ball top and a framework for supporting the ball top and the main sound film, the framework is provided with a first connecting part connected with the top of the ball and a second connecting part bent and extended from the outer periphery of the first connecting part along the vibration direction of the sound generating device towards the magnetic circuit system, the first connecting part is provided with a first surface and a second surface which are arranged oppositely along the vibration direction of the sound generating device, the first surface is far away from the magnetic circuit system, the dome is characterized by comprising a main body part and a limiting part, wherein the main body part and the second surface are stacked, the limiting part extends from the main body part to the voice coil, and the limiting part is abutted against the voice coil.

2. The sound generating apparatus of claim 1, wherein: the limiting portion comprises a first bending portion and a second bending portion, the first bending portion extends towards the voice coil in a bending mode, the second bending portion extends in a horizontal bending mode in the direction of one end, away from the main body portion, of the first bending portion, and the second bending portion is abutted to the voice coil.

3. The sound generating apparatus of claim 2, wherein: the first bending part extends towards the voice coil from the main body part and bends along the vibration direction of the sound generating device.

4. The sound generating apparatus of claim 3, wherein: the first bending portion extends from the outer edge of the main body portion to the voice coil and along the vibration direction of the sound generating device.

5. The sound generating apparatus according to any one of claims 1 to 4, wherein: the limiting part is provided with a plurality of mutually-spaced limiting units for connecting the main body part and the voice coil and a plurality of grooves for spacing two adjacent limiting units.

6. The sound generating apparatus of claim 1, wherein: the main body part and the limiting part are integrally formed into the dome.

7. The sound generating apparatus of claim 1, wherein: the voice coil comprises a first cavity and a voice coil body which surrounds the first cavity, the voice coil body is abutted to a second bending portion of the spherical top, and the second bending portion is located on the projection of the vibration direction of the sound generating device and located on the projection of the vibration direction of the sound generating device.

8. The sound generating apparatus of claim 1, wherein: the main sound membrane comprises a first fixing part and a second fixing part, the first fixing part is connected with the framework, the second fixing part is connected with the basin frame, the first fixing part is provided with a third surface and a fourth surface, the third surface and the fourth surface are arranged in the opposite direction of the vibration direction of the sound generating device, the fourth surface is connected with the second connecting part of the framework in an abutting mode, and the third surface is flush with the first surface of the first connecting part of the framework.

9. The sound generating apparatus of claim 1, wherein: the framework further comprises a through hole formed by the first connecting part in a surrounding mode, the first connecting part and the main body part of the dome are arranged in a stacked mode, and the main body part of the dome covers the through hole; the vibration system further comprises a flexible circuit board electrically connected with the voice coil, the second connecting portion of the framework is provided with a second connecting sub portion used for being connected with the main voice diaphragm, two oppositely arranged third connecting sub portions used for being connected with the flexible circuit board, and a first connecting sub portion used for connecting the first connecting portion and the second connecting sub portion, the first connecting sub portion is vertically arranged on the outer periphery of the first connecting portion and extends towards the direction of the magnetic circuit system, the second connecting sub portion is vertically arranged on the first connecting sub portion and extends towards the direction far away from the first connecting portion, and the third connecting sub portion is vertically connected with the second connecting sub portion and extends towards the direction of the magnetic circuit system.

10. The sound generating apparatus of claim 9, wherein: the vibration system further comprises an auxiliary sound film abutted to the flexible circuit board, the auxiliary sound film and the main sound film are arranged in a mode that the vibration direction of the sound generating device is opposite, and the voice coil is driven by the framework to drive the main sound film and the auxiliary sound film to vibrate synchronously.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of electroacoustic conversion, in particular to a sound production device.

[ background of the invention ]

In order to achieve a good sound effect, a sound generating device in the prior art is generally provided with a relatively complex vibration system. The vibration system typically includes a voice coil, diaphragm, flexible circuit board, washer, or other component for connecting the dome to the voice coil. Wherein, the vibrating diaphragm comprises a ball top, a framework and a voice coil. In the production process, the assembly difficulty of the sound generating device is increased due to the characteristics of various parts, complex structure and the like of the vibration system.

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

[ summary of the invention ]

The invention aims to provide a sound generating device which can simplify the assembly process of the sound generating device in the production process.

The technical scheme of the invention is as follows: the utility model provides a sound generating mechanism, including basin frame and rigid coupling in the vibration system and the magnetic circuit of basin frame, vibration system includes vibrating diaphragm and drive the voice coil loudspeaker voice coil of vibrating diaphragm vibration, the vibrating diaphragm includes the ball top, is located the main sound membrane and the support of ball top periphery the ball top with the skeleton of main sound membrane, the skeleton have with the ball top be connected first connecting portion and certainly the outer peripheral edges of first connecting portion are followed sound generating mechanism's vibration direction court the second connecting portion that magnetic circuit buckles and extend, first connecting portion have the edge the first surface and the second surface that sound generating mechanism's vibration opposite direction set up, the first surface is kept away from magnetic circuit, the ball top include with the main part that the second surface range upon range of setting and certainly the main part court the voice coil loudspeaker voice coil extends, and with the spacing portion of butt.

Optionally, the limiting portion includes a first bending portion extending from the main body portion toward the voice coil in a bending manner, and a second bending portion extending from the first bending portion in a horizontal bending manner in a direction away from one end of the main body portion, and the second bending portion abuts against the voice coil.

Optionally, the first bending portion extends from the main body portion toward the voice coil and bends along the vibration direction of the sound generating device.

Optionally, the first bending portion extends from an outer edge of the main body portion toward the voice coil and along a vibration direction of the sound generating device.

Optionally, the position-limiting part has a plurality of mutually spaced position-limiting units connecting the main body part and the voice coil, and a plurality of grooves separating two adjacent position-limiting units.

Optionally, the main body part and the limiting part are integrally formed into the dome.

Optionally, the voice coil includes a first cavity and a voice coil body surrounding the first cavity, the voice coil body abuts against a second bending portion of the dome, and a projection of the second bending portion along a vibration direction of the sound generating device overlaps with a projection of the voice coil body along the vibration direction of the sound generating device.

Optionally, the main sound membrane include with the first fixed part that the skeleton is connected and with the second fixed part that the basin frame is connected, first fixed part has the edge third surface and the fourth surface that sound generating mechanism's vibration opposite direction set up, the fourth surface with sub-looks butt is connected to the second of skeleton, the third surface with the first surface of the first connecting portion of skeleton flushes.

Optionally, the first connecting portion of the framework has a through hole, the first connecting portion and the main body portion of the dome are stacked, and the main body portion of the dome covers the through hole; the vibration system further comprises a flexible circuit board electrically connected with the voice coil, the second connecting portion of the framework is provided with a second connecting sub portion used for being connected with the main voice diaphragm, a third connecting sub portion used for being connected with the flexible circuit board, and a first connecting sub portion used for being connected with the first connecting portion and the second connecting sub portion, the first connecting sub portion is vertically arranged on the outer periphery of the first connecting portion and extends towards the direction of the magnetic circuit system, the second connecting sub portion is vertically arranged on the first connecting sub portion and extends towards the direction far away from the first connecting portion, and the third connecting sub portion is vertically connected with the second connecting sub portion and extends towards the direction of the magnetic circuit system.

Optionally, the vibration system further comprises an auxiliary sound film abutted to the flexible circuit board, the auxiliary sound film and the main sound film are arranged in a manner of being opposite to the vibration direction of the sound generating device, and the voice coil is driven by the framework to synchronously vibrate the main sound film and the auxiliary sound film.

The invention has the beneficial effects that: according to the invention, the structure of the ball top in the sound generating device is improved, so that the limiting part of the ball top can be directly connected with the voice coil, the height position of the voice coil can be limited by limiting the size of the limiting part in the structure of the ball top, and compared with other sound generating devices which use connecting pieces to limit the height position of the voice coil, the invention can reduce the connecting pieces used for connecting the ball top and the voice coil, thereby reducing the assembly operation of the connecting pieces and other components, and further achieving the effect of simplifying the assembly process.

[ description of the drawings ]

Fig. 1 is a schematic structural diagram of a sound generating device provided by the present invention;

FIG. 2 is a cross-sectional view taken along the line P-P of the sound generating device of FIG. 1;

FIG. 3 is an exploded view of the sound generator of FIG. 1;

FIG. 4 is a schematic view of the structure of the dome of the sound generating device shown in FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 4;

fig. 6 is a schematic structural diagram of a skeleton in the sound generating device shown in fig. 3;

FIG. 7 is a schematic diagram of the connection of the bobbin, the dome and the voice coil of the sound generating device shown in FIG. 3;

fig. 8 is a partially enlarged view of B shown in fig. 7.

[ detailed description ] embodiments

The invention is further described with reference to the following figures and embodiments.

Referring to fig. 1 to 3, fig. 1 is a schematic view of a sound generating device according to the present invention, fig. 2 is a cross-sectional view of the sound generating device shown in fig. 1 taken along a direction P-P, and fig. 3 is an exploded view of the sound generating device shown in fig. 1. The embodiment of the invention provides a sound generating device 100, and the sound generating device 100 can comprise a fixing system 1, a vibration system 2 and a magnetic circuit system 6. The fixing system 1 can be used as a carrier of the vibration system 2 and the magnetic circuit system 6 to support the vibration system 2 and the magnetic circuit system 6. The magnetic circuit system 6 can drive the vibration system 2 to vibrate and generate sound.

The vibration system 2 includes a diaphragm 21, a voice coil 24 for driving the diaphragm 21 to vibrate, and a flexible circuit board 26 electrically connected to the voice coil 24. The diaphragm 21 includes a dome 211 directly connected to the voice coil 24, a bobbin 212 surrounding the dome 211, a main diaphragm 213 connected to the bobbin 212, and an auxiliary diaphragm 214 connected to the flexible circuit board 26.

The flexible circuit board 26 is located inside the sound generating device 100 for connecting an external circuit and supplying an alternating current to the voice coil 24. The flexible circuit board 26 includes a first flexible circuit board 261 and a second flexible circuit board 262, and the first flexible circuit board 261 includes a pad 2613 and a first terminal 2611 and a second terminal 2622 disposed on the pad 2613 for connection with the voice coil 24. The second flexible circuit board 262 has a structure similar to that of the first flexible circuit board 261, and the second flexible circuit board 262 has only a pad structure and is not provided with a terminal for connection with the voice coil 24. The first flexible circuit board 261 and the second flexible circuit board 262 are respectively located at both ends of the sound emitting device 100. The bonding pad has two surfaces arranged opposite to the vibration direction of the sound generating device 100, one surface close to the voice coil 24 is used for being fixedly connected with the framework 212, and the other surface far away from the voice coil 24 is used for being connected with the auxiliary sound film 214.

The voice coil 24 is located at the center of the sound generating device 100 and is used for driving the diaphragm 21 to vibrate and generate sound. The flexible circuit board 26 is disposed at an end of the voice coil 24 remote from the dome 211. The voice coil 24 includes a first cavity 241, a voice coil body 242 surrounding the first cavity 241, and a first lead 244 and a second lead 246 disposed on the voice coil body 242, the voice coil body 242 includes a first face 2422 adjacent to the globe 211 and a second face 2424 adjacent to the flexible circuit board 26, the first lead 244 is disposed on the first face 2422, and the second lead 246 is disposed on the second face 2424. The first and second leads 244 and 246 are used to electrically connect with the flexible circuit board 26. Specifically, the first lead 244 is connected to a first terminal 2611 of the first flexible circuit board 261, and the second lead 246 is connected to a second terminal 2612 of the first flexible circuit board 261. The connection of the voice coil 24 and the flexible circuit board 26 may be understood as an electrical connection, such as a fixed connection by means of signal lines, which may enable data transmission. The voice coil 24, which is fed with the alternating current, is vibrated by the magnetic force in the magnetic field, and drives the diaphragm 21 in the vibration system 2 or the air in the cavity of the sound generating device 100 to vibrate, so as to generate sound.

The diaphragm 21 is connected to the flexible circuit board 26 and the voice coil 24 to form a complete vibration system 2. The diaphragm 21 includes a dome 211, a frame 212 surrounding the dome 211, a main diaphragm 213 connected to the frame 212, and an auxiliary diaphragm 214 connected to the flexible circuit board 26.

Referring to fig. 4 and 5, fig. 4 is a schematic structural view of a dome of the sound generating device shown in fig. 3, and fig. 5 is a partial enlarged view of a shown in fig. 4. The dome 211 includes a main body portion 2111 laminated and connected to the bobbin 212, and a stopper portion 2112 extending from the main body portion 2111 toward the voice coil 24 and abutting against the voice coil 24, and the dome 211 connects the voice coil 24 and the main diaphragm 213.

The body portion 2111 has a plate-like configuration, and in some specific embodiments, the body portion 2111 may have a rounded rectangular plate-like configuration. The main body portion 2111 has an inner surface 2111a and an outer surface 2111b which are oppositely arranged in the vibration direction of the sound generating apparatus 100, the inner surface 2111a being close to the voice coil 24, and the outer surface 2111b being far from the voice coil 24. An outer surface 2111b of the body portion 2111 is adapted to be coupled to the bone 212, and an inner surface 2111a of the body portion 2111 is adapted to receive the retaining portion 2112.

The stopper 2112 is connected to the main body 2111 and is directly connected to the voice coil 24 to restrict the height position of the voice coil 24. The stopper 2112 includes a first bent portion 2112a bent and extended from the main body 2111 toward the voice coil 24, and a second bent portion 2112b bent and extended horizontally from the first bent portion 2112a in a direction away from the end of the main body 2111, and the second bent portion 2112b abuts against the voice coil 24. Specifically, the second bent portion 2112b abuts against the first surface 2422 of the voice coil 24, and a projection of the second bent portion 2112b in the vibration direction of the sound generating device 100 overlaps with a projection of the voice coil 24 body in the vibration direction of the sound generating device 100. In some embodiments, the limiting portion 2112 has an L-shaped strip structure, and the first bent portion 2112a extends from the main body portion 2111 toward the voice coil 24 and bends along the vibration direction of the sound generating apparatus 100, that is, the first bent portion 2112a is perpendicular to the main body portion 2111. The second bent portion 2112b is perpendicularly connected to the first bent portion 2112a and is parallel to the main body portion 2111. And the first bent portion 2112a extends from the outer edge of the main body portion 2111 toward the voice coil 24 and along the vibration direction of the sound generating apparatus 100. In some other embodiments, the angle between the first bent portion 2112a and the main body portion 2111 may be different from 90 °. It is understood that when the retaining portion 2112 has a more regular shape and the position relationship between the retaining portion 2112 and the main body portion 2111 is simply parallel or perpendicular, the machining of the ball top 211 is easier and more feasible.

In addition, the stopper portion 2112 may have a plurality of stopper units provided at intervals from each other connecting the main body portion 2111 and the voice coil 24, and a plurality of recessed grooves 2112c separating adjacent two stopper units. In some specific embodiments, the number of the limiting units and the grooves 2112c may be four.

In the related art, the voice coil 24 and the diaphragm 21 are generally connected by a washer, and the height position of the voice coil 24 is adjusted and defined by changing the thickness of the washer. During subsequent assembly of the sound generating device 100, it is necessary to attach the washers to the voice coil 24 and the diaphragm 21, respectively. Therefore, one connection member and two assembling operations corresponding thereto are required in the prior art to solve the problem of defining the height position of the voice coil 24. In the invention, the voice coil 24 and the diaphragm 21 are directly connected through the ball top 211, the height position of the voice coil 24 is limited by utilizing the inherent structure of the ball top 211, and the height position of the voice coil 24 can be limited by adjusting the size of the limiting part 2112. The limiting portion 2112 belongs to a part of the dome 211, and the limiting portion 2112 replaces a gasket, so that connecting pieces between the dome 211 and the voice coil 24 are reduced, related assembling procedures of the connecting pieces are reduced, and the effect of simplifying the assembling process is achieved.

In other alternative embodiments of the present invention, the limiting portion 2112 of the dome 211 only needs to extend from the main body portion 2111 toward the voice coil 24 to abut against the voice coil 24, so as to adjust the height position of the voice coil 24. Therefore, the structure in which the dome 211 extends from the main body portion 2111 toward the voice coil 24 to abut against the voice coil 24 is within the scope of the embodiments of the present invention. For example, the limiting portion 2112 may not have two bending portions, and the limiting portion 2112 directly extends a bending structure at the outer edge of the main body portion 2111 toward the voice coil 24 to directly abut against the voice coil 24. For another example, the limiting portion 2112 may not be located at the outer edge of the main body portion 2111, and the limiting portion 2112 may extend toward the voice coil 24 at a position other than the edge of the main body portion 2111 to form a bent structure directly abutting against the voice coil 24.

In some specific embodiments, the body portion 2111 and the retaining portion 2112 are integrally formed as a dome 211 structure. Specifically, the dome 211 may be integrally formed by flanging or injection molding. The main body portion 2111 and the limiting portion 2112 of the dome 211 are formed in a non-limiting manner, for example, the main body portion 2111 and the limiting portion 2112 may be manufactured separately by cutting, injection molding, or other processes, and then the two portions are connected by other fixing means such as bonding, welding, or the like.

The voice coil 24 can drive the main diaphragm 213 and the auxiliary diaphragm 214 to vibrate under the operating condition, so that the sound generating device 100 generates sound. The auxiliary sound film 214 and the magnetic circuit system 6 are located on the same side of the sound generating device 100, the main sound film 213 is disposed opposite to the auxiliary sound film 214 along the vibration direction, and the main sound film 213 and the magnetic circuit system 6 are not located on the same side of the sound generating device 100.

The main sound film 213 includes an opening 2131, a first fixing portion 2132 surrounding the opening 2131 to form the opening 2131, a folding ring 2133 connected to the fixing portion, and a second fixing portion 2134 disposed perpendicularly to the first fixing portion 2132 and surrounding the periphery of the folding ring 2133. The first fixing portion 2132 is for fixing the main voice coil 24 to the bobbin 212, and the second fixing portion 2134 is for fixing the main diaphragm 213 to the frame 12. The first fixing portion 2132 has a third surface 2132a and a fourth surface 2132b oppositely arranged in the vibration direction, the fourth surface 2132b is close to the voice coil 24, and the third surface 2132a is far away from the voice coil 24.

The auxiliary sound diaphragm 214 includes a first auxiliary sound diaphragm 2141 and a second auxiliary sound diaphragm 2142, and the first auxiliary sound diaphragm 2141, the second auxiliary sound diaphragm 2142 and the magnetic circuit system 6 are located on the same side of the sound generating device 100. The auxiliary diaphragm 214 is fixed to the flexible circuit board 26. The first auxiliary diaphragm 2141 has a third fixing portion 2141a close to the voice coil 24 and a second fixing portion 2141b far from the voice coil 24, and the first auxiliary diaphragm 2141 is fixed to the first flexible circuit board 261 by the third fixing portion 2141a and the fourth fixing portion 2141 b. Specifically, the third fixing portion 2141a and the fourth fixing portion 2141b abut against a surface of the pad 2613 away from the voice coil 24. The first auxiliary sound film 2141 and the second auxiliary sound film 2142 have the same structure, and the second auxiliary sound film 2142 is connected to the second flexible circuit board 262 in the same manner as the first auxiliary sound film 2141 and the first flexible circuit board 261.

Referring to fig. 6 to 8, fig. 6 is a schematic structural diagram of a skeleton in the sound generating device shown in fig. 3, fig. 7 is a schematic connection diagram of the skeleton, a dome and a voice coil in the sound generating device shown in fig. 3, and fig. 8 is a partial enlarged view of B shown in fig. 7. The frame 212 includes a through hole 2123, a first connection portion 2121 surrounding the through hole 2123, and a second connection portion 2122 extending from an outer peripheral edge of the first connection portion 2121 toward the magnetic circuit system 6 in the vibration direction. The frame 212 connects the dome 211, the main voice coil 213 and the flexible circuit board 26 at the same time, thereby supporting the dome 211.

First connection portion 2121 of skeleton 212 is configured to be connected to dome 211, and first connection portion 2121 has a first surface 2121a and a second surface 2121b opposite to each other in the vibration direction, where first surface 2121a is away from magnetic circuit system 6, and second surface 2121b is close to magnetic circuit system 6. The first connection portion 2121 and the body portion 2111 of the dome 211 are stacked, and the second surface 2121b of the first connection portion 2121 abuts against the outer surface 2111b of the body portion 2111 of the dome 211. In some embodiments, the ball top 211 and the first connection portion 2121 of the skeleton 212 may be fixed by glue. Skeleton 212 is connected with dome 211 through first connecting portion 2121, and after dome 211 is connected with skeleton 212, dome 211 covers through-hole 2123 on skeleton 212, realizes the sealed of sound generating mechanism 100. The skeleton 212 thus also assumes the function of part of the dome 211.

The second connecting portion 2122 is used to connect to the main sound diaphragm 213, and when the frame 212 is connected to the main sound diaphragm 213, the first connecting portion 2121 of the frame 212 closes the opening 2131 of the main sound diaphragm 213. The second connecting portion 2122 of the frame 212 further includes a second connecting portion 2122b for connecting to the main sound film 213, a third connecting portion 2122c for connecting to the flexible circuit board 26, and a first connecting portion 2122a for connecting the first connecting portion 2121 and the second connecting portion 2122, the first connecting portion 2122a is vertically disposed on an outer periphery of the first connecting portion 2121, the second connecting portion 2122b is connected to an edge of the first connecting portion 2122a in a bent manner and extends in a direction away from the first connecting portion 2121, and the third connecting portion 2122c is connected to an outer periphery of the second connecting portion 2122b in a bent manner and extends in a direction toward the magnetic circuit system 6. Specifically, the second connector portion 2122b is connected to the main sound film 213, and the third surface 2132a of the main sound film 213 is flush with the first surface 2121a of the first connector portion 2121 of the skeleton 212. The frame 212 has two third connector portions 2122c, and the two third connector portions 2122c are abutted against the pads of the flexible circuit board 26.

Dome 211 is connected to first connector portion 2121 of frame 212, and main sound film 213 is connected to second connector portion 2122b of second connector portion 2122. Therefore, the bobbin 212 connects the dome 211 and the main diaphragm 213 at the same time, and thus the connection of the voice coil 24 and the main diaphragm 213 is achieved. The second connector portion 2122b of the bobbin 212 is connected to the main sound film 213, the third connector portion 2122c of the bobbin 212 is connected to the flexible circuit board 26, and the auxiliary sound film 214 is connected to the flexible circuit board 26. Therefore, the main diaphragm 213 is connected to the auxiliary diaphragm 214 by the bobbin 212, and when the voice coil 24 vibrates, the main diaphragm 213 and the auxiliary diaphragm 214 are driven by the bobbin 212 to vibrate synchronously, which can be understood that the synchronous vibration of the main diaphragm 213 and the auxiliary diaphragm 214 avoids the generation of noise.

The framework 212 connects the diaphragm 21 and the flexible circuit board 26 to support the vibration system 2. The working principle of the vibration system 2 is as follows: the magnetic circuit 6 provides a magnetic field, and the flexible circuit board 26 in the vibration system 2 provides an alternating current to the voice coil 24, and the voice coil 24 supplied with the alternating current is subjected to the magnetic force when being in the magnetic field. Under the influence of the magnetic force, the voice coil 24 is moved. The voice coil 24 is directly connected to the diaphragm 21 through the dome 211. Therefore, the vibration of the voice coil 24 will drive the vibration of the diaphragm 21, and thus generate sound.

The magnetic circuit system 6 provides a stable magnetic field for the voice coil 24, and includes a main magnetic steel 62, a plurality of secondary magnetic steels 64 surrounding the main magnetic steel 62, a yoke 66, and a pole piece 68 located in the same plane as the yoke 66.

The main magnetic steel 62 is located at the center of the magnetic circuit system 6, and has a regular structure, and in some specific embodiments, the main magnetic steel 62 may have a rectangular parallelepiped structure and is made of a magnetic material. The secondary magnetic steels 64 include a first secondary magnetic steel 642, a second secondary magnetic steel 644, a third secondary magnetic steel 646, and a fourth secondary magnetic steel 648. A magnetic gap is formed between the secondary magnetic steel 64 and the primary magnetic steel 62, and the voice coil 24 is suspended in the magnetic gap 69. The primary magnet 62 and the plurality of secondary magnets 64 are magnetized in the magnetic gap 69. The pole piece 68 has a regular structure, and in some embodiments, the pole piece 68 may have a rectangular plate-like structure, and the pole piece 68 is stacked with the main magnetic steel 62 for conducting magnetism and preventing magnetic leakage.

The yoke 66 is used to fix the four secondary magnetic steels 64. The yoke 66 includes a fixing plate, a receiving hole 664 formed in the fixing plate, and a protruding portion 662 located at an edge of the fixing plate, and the fixing plate and the four sub magnetic steels 64 are stacked. The pole core 68 is located in the receiving hole 664 formed in the yoke 66, and a first gap is left between the yoke 66 and the pole core 68, the first gap and the magnetic gap 69 are communicated, and the voice coil 24 is received together. The protrusion 662 is used to connect the fixing system 1, so as to assemble and fix the magnetic circuit system 6 to other systems to form a complete sound generating device 100.

The fixing system 1 fixes the magnetic circuit system 6 and the vibration system 2, and comprises a basin stand 12 and a bottom plate 13.

The frame 12 has a second cavity 121, a body 122 surrounding the second cavity 121, and a recess 124 disposed on the body 122. The second fixing portion 2134 of the main diaphragm 213 is connected to the main body 122 of the frame. The main body of the frame 12 has two surfaces that are arranged opposite to each other in the vibration direction of the sound generating device 100, and one surface close to the voice coil 24 is in contact with the main diaphragm 213. The surface close to the magnetic circuit system 6 abuts against the flexible circuit board 26. Therefore, the frame 12 is connected to both the main diaphragm 213 and the flexible circuit board 26 to fixedly connect the vibration system 2. The concave part 124 of the basin stand 12 is matched with the convex part 662 of the magnetic yoke 66, so that the basin stand 12 is clamped with the magnetic yoke 66. The magnetic yoke 66 is connected with the four secondary magnetic steels at the same time, so that the four secondary magnetic steels are fixed on the fixed frame by the magnetic yoke 66, and the basin frame 12 realizes the fixation of the magnetic circuit system 6.

In addition, the bottom plate 13 is used to fix the magnetic circuit system 6. The fixing plate is stacked with the main magnet steel 62 and the auxiliary magnet steel 64, and is used for connecting the main magnet steel 62 and the auxiliary magnet steel 64. The base plate 13 connects the primary magnet 62 to the secondary magnet 64, and the secondary magnet 64 is connected to the yoke 66, and the yoke 66 is connected to the frame 12. To this end, the main magnet 62, the sub magnet 64, and the pole piece 68 are integrally formed with the base plate 13 via the yoke 66.

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.