Sound production unit and electronic device

Abstract

Provided in the present invention are a sound production unit and an electronic device. The sound production unit comprise: a support; a magnetic circuit system connected to the support and having a first magnetic gap and a second magnetic gap; and a vibration system comprising a first vibration diaphragm and second vibration diaphragm connected to two sides of the support, and a first voice coil and second voice coil connected to the first vibration diaphragm and the second vibration diaphragm, the first voice coil and the second voice coil being respectively located in the first magnetic gap and the second magnetic gap. The first vibration diaphragm comprises a first corrugated rim, a second corrugated rim, and a vibration part, the vibration part being connected to the first voice coil, and the first corrugated rim being connected to the magnetic circuit system. A through hole is provided in the center of the magnetic circuit system, the first corrugated rim surrounding the through hole. Sound waves of the second vibration diaphragm radiate outwards by means of the through hole, and sound waves of the first vibration diaphragm and the second vibration diaphragm radiate outwards on the same side of the sound production unit. Using the present invention can solve the problem that the vibration area and vibration displacement of existing sound production units cannot meet the requirements of wearable audio products such as OWS earphones.

Description

Sound emitting monomer and electronic device TECHNICAL FIELD

[0001] The present application relates to the technical field of sound emitting, more particularly, to a sound emitting monomer and an electronic device. BACKGROUND

[0002] In recent years, with the development of smart wearable electronic products, the performance requirements of smart wearable products on monomers are getting higher and higher, especially the requirements of OWS (Open Wearable Stereo, which means open wearable stereo in Chinese) Bluetooth earphones are different from TWS (True Wireless Stereo, which means true wireless stereo in Chinese). Because the whole machine is designed to be convenient and comfortable to wear, it adopts the non-ear method, so the performance improvement of the sound emitting monomer is imminent.

[0003] The traditional driver design is single-sided vibration sound emitting. In the limited cavity of the whole machine, it is difficult to increase the vibration area and vibration displacement. Or in some double-sided diaphragm structures, the sound guide channel is often arranged around the sound emitting monomer, occupying a large radial dimension of the sound emitting monomer, resulting in a decrease in the design space of the vibration system, and thus a decrease in the vibration area. Therefore, the performance improvement space of the sound emitting monomer is also limited, which cannot meet the needs of existing OWS and other wearable audio products. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a sound emitting monomer and an electronic device to solve the problem that the vibration area and vibration displacement of the existing sound emitting monomer cannot meet the needs of OWS earphones and other wearable audio products.

[0005] The present application provides a sound emitting monomer, comprising: a support; and,

[0006] a magnetic circuit system connected with the support, having a first magnetic gap and a second magnetic gap;

[0007] a vibration system comprising a first diaphragm and a second diaphragm connected with both sides of the support, a first voice coil connected with the first diaphragm, and a second voice coil connected with the second diaphragm, the first voice coil being located in the first magnetic gap, and the second voice coil being located in the second magnetic gap; wherein,

[0008] the first diaphragm comprises a first folded ring located on the inner side, a second folded ring located on the outer side of the first folded ring, and a vibration part arranged between the first folded ring and the second folded ring, the second folded ring being connected with the support, the vibration part being connected with the first voice coil, and the first folded ring being connected with the magnetic circuit system;

[0009] A through hole is arranged in the center of the magnetic circuit system, the first folded ring surrounds the through hole, the sound waves of the second diaphragm are radiated outward through the through hole, and the sound waves of the first diaphragm and the second diaphragm are radiated outward on the same side of the sound emitting unit.

[0010] In addition, preferably, the first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves of the same phase outward.

[0011] In addition, preferably, the magnetic circuit system comprises a yoke, a center magnetic circuit arranged on the yoke, and a side magnetic circuit, the yoke comprises a center yoke plate and a side yoke plate located outside the center yoke plate, the center yoke plate and the side yoke plate are not coplanar, and a connecting piece is arranged to connect the center yoke plate and the side yoke plate; wherein,

[0012] The center magnetic circuit is arranged between the center yoke plate and the side yoke plate to form the second magnetic gap, the side magnetic circuit is arranged between the side yoke plate and the center yoke plate to form the first magnetic gap, and the through hole penetrates the center yoke plate and the center magnetic circuit.

[0013] In addition, preferably, the center magnetic circuit comprises a center magnet and a center magnetic conductive plate, the side magnetic circuit comprises a side magnet and a side magnetic conductive plate, the center magnetic conductive plate and the side yoke plate form the second magnetic gap, and the side magnetic conductive plate and the center yoke plate form the first magnetic gap; and / or,

[0014] The connecting piece is a magnetic conductive yoke plate, or the connecting piece is a magnet.

[0015] In addition, preferably, the center yoke plate has an extension part extending in a direction close to the first diaphragm, and the extension part is connected to the first folded ring; or,

[0016] The center yoke plate is in the form of a flat plate, one side of the center yoke plate close to the first diaphragm is provided with a support piece, and the support piece is connected to the first folded ring.

[0017] In addition, preferably, the second diaphragm comprises a third folded ring and a reinforcing part, the third folded ring surrounds the reinforcing part, wherein,

[0018] The outer contour of the reinforcing part is circular, the diameter of the outer contour is D1, the through hole is a circular hole, the diameter of the through hole is D2, and D2≥0.3D1.

[0019] In addition, preferably, the second diaphragm comprises a third folded ring and a reinforcing part, the third folded ring surrounds the reinforcing part, wherein,

[0020] The through hole has a first projection area S1 in a projection along a vibration direction of the vibration system to a plane perpendicular to the vibration direction, and the reinforcing portion has a second projection area S2 in a projection along the vibration direction of the vibration system to the plane perpendicular to the vibration direction, S1 >= 8.5%*S2.

[0021] In addition, preferably, the connecting piece is annular, the first diaphragm, the support, the edge yoke plate, the connecting piece and the center yoke plate form a first cavity, the first cavity is a closed cavity, and a first leakage hole is arranged on the sound production unit and communicates the first cavity with the outside.

[0022] In addition, preferably, the center magnetic circuit comprises a center magnet and a center magnetic conducting plate, the edge magnetic circuit comprises an edge magnet and an edge magnetic conducting plate, the second magnetic gap is formed between the center magnetic conducting plate and the edge yoke plate, the first magnetic gap is formed between the edge magnetic conducting plate and the center yoke plate, the edge magnetic conducting plate is injection molded on the support, and the first leakage hole is formed by removing material from the edge magnetic conducting plate and a corresponding support region.

[0023] In addition, preferably, the structure further comprises a back cover, the back cover is located on a side of the second diaphragm away from the first diaphragm, a second cavity is formed between the second diaphragm and the back cover, and a second leakage hole is arranged on the back cover and communicates the second cavity with the outside.

[0024] The application further provides an electronic device comprising a shell having a receiving cavity and a sound production unit arranged in the receiving cavity, wherein the sound production unit is the sound production unit described above, the sound production unit comprises a first diaphragm and a second diaphragm, wherein,

[0025] The sound production unit divides the receiving cavity into a front cavity and a rear cavity which are isolated from each other, a sound outlet hole is arranged on the shell and communicates with the front cavity, and sound waves of the first diaphragm and the second diaphragm are radiated to the outside through the sound outlet hole.

[0026] As can be seen from the above technical solutions, the sound production unit and the electronic device provided by the application combine two vibration systems with a magnetic circuit system, the voice coils of the two vibration systems are staggered and cross each other and share one magnetic circuit system, a through hole is arranged in the center of the magnetic circuit system, one vibration system is arranged around the through hole, sound waves of the diaphragm of the other vibration system are radiated to the outside through the through hole, and the sound waves of the two vibration systems are radiated to the outside on the same side of the sound production unit, so that double-sided diaphragm sound production in the same direction is realized without increasing the size, the vibration area of the vibration system is increased, and the performance is improved.

[0027] To the accomplishment of the foregoing and related ends, one or more aspects of the application, as generally described herein, include the features set forth in the claims below. The following detailed description, therefore, is best deemed in connection with the accompanying drawings in which: BRIEF DESCRIPTION OF DRAWINGS

[0028] Other objects and advantages of the application will become apparent from the following detailed description taken in conjunction with the accompanying drawings, wherein:

[0029] Fig. 1 is an exploded view of a sound emitting unit according to an embodiment of the present application;

[0030] Fig. 2 is a sectional view of the sound emitting unit according to the embodiment of the present application;

[0031] Fig. 3 is an exploded view of a sound emitting unit according to another embodiment of the present application;

[0032] Fig. 4 is a sectional view of the sound emitting unit according to the embodiment of the present application;

[0033] Fig. 5 is an exploded view of a sound emitting unit according to another embodiment of the present application;

[0034] Fig. 6 is a sectional view of the sound emitting unit according to the embodiment of the present application;

[0035] Fig. 7 is an exploded view of a sound emitting unit according to another embodiment of the present application;

[0036] Fig. 8 is a sectional view of the sound emitting unit according to the embodiment of the present application;

[0037] Fig. 9 is a perspective view of an electronic device according to an embodiment of the present application;

[0038] Figs. 10 and 11 are perspective views of a sound emitting unit according to an embodiment of the present application.

[0039] wherein the reference numerals include: 1, first diaphragm, 11, first folded ring, 12, second folded ring, 13, vibration portion,

[0040] 2, second diaphragm, 21, third folded ring, 22, reinforcing portion,

[0041] 3, first voice coil, 4, second voice coil,

[0042] 5, magnetic circuit system, 51, side magnetic plate, 52, center magnet, 53, center magnetic plate, 54, side magnet, 55, yoke, 551, center yoke plate, 552, side yoke plate, 553, magnetic yoke plate, 554, extension, 10, support, 20, magnet, 30, through hole,

[0043] 6, support, 61, first leakage hole,

[0044] 71, first positioning ring, 72, second positioning ring, 73, third positioning ring,

[0045] 8, back cover, 81, second leakage hole,

[0046] 91, upper shell, 92, lower shell, 911, sound hole, 921, third leakage hole.

[0047] The same reference numbers in all the figures indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0048] In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It is apparent, however, that the embodiments can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

[0049] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In order to solve the problem that the vibration area and vibration displacement of the existing sound emitting monomer cannot meet the demand of OWS earphones and other wearable audio products, the present application provides a sound emitting monomer and electronic equipment.

[0051] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0052] In order to illustrate the structure of the sound emitting unit provided by the present application, FIG. 1 to FIG. 8, FIG. 10 and FIG. 11 respectively illustrate the structure of the sound emitting unit from different angles. Specifically, FIG. 1 illustrates an exploded structure of the sound emitting unit according to an embodiment of the present application; FIG. 2 illustrates a sectional structure of the sound emitting unit according to the embodiment of the present application; FIG. 3 illustrates an exploded structure of the sound emitting unit according to another embodiment of the present application; FIG. 4 illustrates a sectional structure of the sound emitting unit according to the embodiment of the present application; FIG. 5 illustrates an exploded structure of the sound emitting unit according to another embodiment of the present application; FIG. 6 illustrates a sectional structure of the sound emitting unit according to the embodiment of the present application; FIG. 7 illustrates an exploded structure of the sound emitting unit according to another embodiment of the present application; FIG. 8 illustrates a sectional structure of the sound emitting unit according to the embodiment of the present application; FIG. 10 and FIG. 11 respectively illustrate a three-dimensional structure of the sound emitting unit according to the embodiments of the present application.

[0053] As shown in FIG. 1 to FIG. 8, FIG. 10 and FIG. 11, the sound emitting unit provided by the present application comprises a support 6, a magnetic circuit system 5 and a vibration system, the magnetic circuit system 5 is connected with the support 6, and the magnetic circuit system 5 has a first magnetic gap and a second magnetic gap;

[0054] The vibration system is connected with the support 6 and comprises a first diaphragm 1 and a second diaphragm 2 connected with two sides of the support 6, a first voice coil 3 connected with the first diaphragm 1, and a second voice coil 4 connected with the second diaphragm 2, the first voice coil 3 is located in the first magnetic gap, and the second voice coil 4 is located in the second magnetic gap; wherein the first diaphragm 1 comprises a first folded ring 11 located at the inner side, a second folded ring 12 located at the outer side of the first folded ring 11, and a vibration part 13 arranged between the first folded ring 11 and the second folded ring 12, the vibration part 12 is connected with the first voice coil 3, and the first folded ring 11 is connected with the magnetic circuit system 5;

[0055] A through hole 30 is arranged at the center of the magnetic circuit system 5, wherein the first folded ring 11 surrounds the through hole 30, the sound wave of the second diaphragm 2 is radiated outward through the through hole 30, and the sound waves of the first diaphragm 1 and the second diaphragm 2 are radiated outward at the same side of the sound emitting unit.

[0056] Wherein, the first diaphragm 1 and the second diaphragm 2 vibrate in the same direction and radiate the sound waves of the same phase outward, so that the volume of the sound emitting unit can be improved.

[0057] Optionally, the bracket is cylindrical, and the outer periphery profiles of the first diaphragm 1 and the second diaphragm 2 are substantially the same, facilitating the regular design of the sound-emitting monomer shape, further facilitating the assembly in the whole machine, and simplifying the reserved structure of the whole machine. Further optionally, the bracket includes a cylindrical first bracket and a cylindrical second bracket, and the first bracket and the second bracket are adaptively connected to form the cylindrical bracket; by designing the bracket into the first bracket and the second bracket, the first diaphragm can be assembled by the first bracket, and the second diaphragm can be assembled by the second bracket, facilitating the assembly of the sound-emitting monomer in the assembly process, and conductive terminals can also be respectively arranged on the first bracket and the second bracket, thereby facilitating the electrical connection between the first voice coil and the second voice coil and an external circuit.

[0058] In an embodiment, the magnetic circuit system 5 includes a magnetic yoke 55, a center magnetic circuit arranged on the magnetic yoke 55, and an edge magnetic circuit, wherein the magnetic yoke 55 includes a center yoke plate 551 and an edge yoke plate 552 located outside the center yoke plate 551, the center yoke plate 551 is not coplanar with the edge yoke plate 552, a connecting piece is arranged to connect the center yoke plate 551 and the edge yoke plate 552, the center magnetic circuit is arranged between the center yoke plate 551 and the edge yoke plate 552 to form the second magnetic gap, the edge magnetic circuit is arranged between the edge yoke plate 552 and the center yoke plate 551 to form the first magnetic gap, and the through hole 30 penetrates the center yoke plate 551 and the center magnetic circuit.

[0059] The center magnetic circuit includes a center magnet 52 and a center magnetic guide plate 53, the edge magnetic circuit includes an edge magnet 54 and an edge magnetic guide plate 51, the second magnetic gap is formed between the center magnetic guide plate 53 and the edge yoke plate 552, and the first magnetic gap is formed between the edge magnetic guide plate 51 and the center yoke plate 551.

[0060] In an embodiment, the connecting piece is a magnetic guide yoke plate 553, which can be designed integrally with the center yoke plate 551 and the edge yoke plate 552 for easy processing; or in another embodiment, the connecting piece is a magnet 20, which can further improve the magnetic field performance of the magnetic circuit system 5.

[0061] In embodiment one (Fig. 1 and Fig. 2) and embodiment two (Fig. 3 and Fig. 4), the connecting piece is a magnetic guide yoke plate 553; in embodiment three (Fig. 5 and Fig. 6) and embodiment four (Fig. 7 and Fig. 8), the connecting piece is a magnet 20, which is a ring magnet. In specific applications, appropriate connecting pieces can be selected according to actual conditions.

[0062] The center yoke plate 551 has an extension 554 extending in a direction close to the first diaphragm 1, and the extension 554 is connected with the first folded ring 11; the extension 554 and the inner edge of the first folded ring 11 are integrally formed on the center yoke plate 551, which is beneficial to simplify the number of components and improve the positioning accuracy in the assembly process. Alternatively, the center yoke plate 551 is a flat plate, and a support 10 is arranged on the side of the center yoke plate 551 close to the first diaphragm 1, and the support 10 is connected with the first folded ring 11; the first folded ring 11 is connected with the center yoke plate 551 through the support 10, which reduces the processing difficulty of the magnetic yoke 55 and facilitates assembly.

[0063] In embodiment one (Fig. 1 and Fig. 2) and embodiment three (Fig. 5 and Fig. 6), the extension 544 and the center yoke plate 551 are integrally formed. In embodiment two (Fig. 3 and Fig. 4) and embodiment four (Fig. 7 and Fig. 8), the center yoke plate 551 and the support 10 are not integrally designed, and the support 10 is an annular structure, and the support 10 is connected with the first folded ring 11. In specific applications, appropriate design structures can be selected according to actual conditions, and are not limited to a certain way.

[0064] In the embodiments of the present application, the second diaphragm 2 includes a third folded ring 21 and a reinforcing portion 22, and the third folded ring 21 surrounds the reinforcing portion 22, wherein the outer contour of the reinforcing portion 22 is circular, the diameter of the outer contour is D1, the through hole 30 is a circular hole, and the diameter of the through hole 30 is D2, and D2≥0.3D1. The diameter of the reinforcing portion 22 and the diameter of the through hole 30 directly affect the transmission of the sound wave of the second diaphragm, and through the above diameter design method, the sound wave of the second diaphragm 2 can be smoothly transmitted, and air flow noise can be reduced.

[0065] Alternatively, the projection of the through hole 30 along the vibration direction of the vibration system to the plane perpendicular to the vibration system is defined as a first projection area S1, the projection of the reinforcing portion 22 along the vibration direction of the vibration system to the plane perpendicular to the vibration system is defined as a second projection area S2, and S1≥8.5%*S2. Through the above projection area design method, the sound wave of the second diaphragm 2 can be smoothly transmitted, and air flow noise can be reduced. In specific applications, appropriate structure designs can be selected according to actual needs to ensure that the sound wave of the second diaphragm 2 is smoothly transmitted and air flow noise is reduced.

[0066] In the embodiment of the present application, the connecting piece is annular, the first diaphragm 1, the support 6, the edge yoke plate 552, the connecting piece, the center yoke plate 551 form a first cavity, the first cavity is a closed cavity, and a first leakage hole 61 communicating the first cavity with the outside is arranged on the sound production unit. Preferably, the first leakage hole 61 is a plurality of first leakage holes 61 arranged symmetrically along the circumference of the sound production unit.

[0067] Optionally, the center magnetic circuit includes a center magnet 52 and a center magnetic conducting plate 53, the edge magnetic circuit includes an edge magnet 54 and an edge magnetic conducting plate 51, the second magnetic gap is formed between the center magnetic conducting plate 53 and the edge yoke plate 552, the first magnetic gap is formed between the edge magnetic conducting plate 51 and the center yoke plate 551, the edge magnetic conducting plate 51 is injection molded on the support 6, and the first leakage hole 61 is formed by removing the edge magnetic conducting plate 51 and the corresponding support area. In the embodiment of the present application, by removing the edge magnetic conducting plate 51 and the support 6, the first leakage hole 61 does not additionally occupy the radial dimension of the sound production unit so as to maximize the radial dimension of the sound production unit, or the size of the leakage hole can be increased under the limited size of the sound production unit to balance the internal pressure.

[0068] In the embodiment of the present application, the sound production unit further includes a back cover 8 located on the side of the second diaphragm 2 away from the first diaphragm 1, a second cavity is formed between the second diaphragm 2 and the back cover 8, and a second leakage hole 81 communicating the second cavity with the outside is arranged on the back cover 8. The back cover is made of metal material, which can support the sound production unit during assembly and reduce the size of the whole machine. In specific applications, a proper number of leakage holes is set according to actual conditions, which is not limited to a fixed number.

[0069] In addition, in the embodiment of the present application, a positioning ring can be arranged between the second folding ring 12 and the support 6, between the third folding ring 22 and the support 6, and between the first folding ring 11 and the support 10. Specifically, the positioning ring can be a steel ring. Specifically, a first positioning ring 71 for positioning is arranged between the second folding ring 12 and the support 6, a second positioning ring 72 for positioning is arranged between the third folding ring 22 and the support 6, and a third positioning ring 73 for positioning is arranged between the first folding ring 11 and the support 10. By using the positioning ring, the first diaphragm 1 or the second diaphragm 2 is convenient to take during assembly, and the assembly precision and the performance of the sound production unit are improved.

[0070] The application further provides an electronic device, comprising a shell with a receiving cavity and a sound production unit arranged in the receiving cavity, wherein the shell comprises an upper shell 91 and a lower shell 92, the sound production unit comprises a first diaphragm 1 and a second diaphragm 2, the sound production unit separates the receiving cavity into a front cavity and a rear cavity which are isolated from each other, in the embodiment shown in Fig. 9, a sound hole 911 is arranged on the upper shell 91 of the shell and communicates with the front cavity, and sound waves of the first diaphragm 1 and the second diaphragm 2 are radiated to the outside through the sound hole 911. A third leakage hole 921 is arranged on the lower shell 92 of the shell for adjusting the pressure in the rear cavity.

[0071] In the embodiments of the application, the shell of the electronic device can have a square structure, in specific applications, other suitable structures such as a circular structure can be selected according to actual conditions, and the application is not limited to a specific shape.

[0072] The specific structure of the sound production unit is referred to the above embodiments, since the electronic device adopts all the technical solutions of the above embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described here.

[0073] As can be seen from the above embodiments, the sound production unit and the electronic device provided by the application combine two vibration systems with a magnetic circuit system, the voice coils of the two vibration systems are staggered and cross each other and share one magnetic circuit system, a through hole is arranged in the center of the magnetic circuit system, one vibration system is arranged around the through hole, and the sound waves of the diaphragm of the other vibration system are radiated to the outside through the through hole, and the sound waves of the two vibration systems are radiated to the outside on the same side of the sound production unit, so that double-sided and same-direction sound production is realized without increasing the size of the appearance, the vibration area of the vibration system is increased, and the performance is improved.

[0074] The sound production unit and the electronic device according to the application are described above with reference to the accompanying drawings by way of example. However, those skilled in the art should understand that various improvements can be made to the sound production unit and the electronic device according to the application described above without departing from the content of the application. Therefore, the protection scope of the application should be determined by the content of the appended claims.

Claims

1. A sound producing monomer, characterized in that, The sound emitting monomer comprises a support and a magnetic circuit system connected to the support, the magnetic circuit system having a first magnetic gap and a second magnetic gap. The sound emitting monomer further comprises a vibration system connected to both sides of the support, the vibration system having a first diaphragm and a second diaphragm, a first voice coil connected to the first diaphragm, and a second voice coil connected to the second diaphragm, the first voice coil being located in the first magnetic gap, and the second voice coil being located in the second magnetic gap. The first diaphragm comprises a first folded ring located at an inner side, a second folded ring located outside the first folded ring, and a vibration part arranged between the first folded ring and the second folded ring, the second folded ring being connected to the support, the vibration part being connected to the first voice coil, and the first folded ring being connected to the magnetic circuit system. A through hole is arranged in the center of the magnetic circuit system, the first folded ring surrounds the through hole, sound waves of the second diaphragm are radiated outward through the through hole, and sound waves of the first diaphragm and the second diaphragm are radiated outward on the same side of the sound emitting monomer.

2. The sound emitting monomer according to claim 1, wherein The first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves of the same phase outward.

3. The sound emitting monomer according to claim 1, wherein The magnetic circuit system comprises a magnetic yoke, a center magnetic circuit arranged on the magnetic yoke, and a side magnetic circuit, the magnetic yoke comprises a center yoke plate and a side yoke plate located outside the center yoke plate, the center yoke plate and the side yoke plate are not coplanar, and a connecting piece is arranged to connect the center yoke plate and the side yoke plate, the center magnetic circuit is arranged between the center yoke plate and the side yoke plate to form the second magnetic gap, the side magnetic circuit is arranged between the side yoke plate and the center yoke plate to form the first magnetic gap, and the through hole penetrates the center yoke plate and the center magnetic circuit.

4. The sound emitting monomer according to claim 3, wherein The center magnetic circuit comprises a center magnet and a center magnetic guide plate, the side magnetic circuit comprises a side magnet and a side magnetic guide plate, the center magnetic guide plate and the side yoke plate form the second magnetic gap, and the side magnetic guide plate and the center yoke plate form the first magnetic gap; and / or The connecting piece is a magnetic yoke plate, or the connecting piece is a magnet.

5. The sound emitting monomer according to claim 3, wherein The center yoke plate has an extension part extending in a direction close to the first diaphragm, and the extension part is connected to the first folded ring; or The center yoke plate is a flat plate, a side of the center yoke plate close to the first diaphragm is provided with a support piece, and the support piece is connected to the first folded ring.

6. The sound emitting monomer according to claim 1, wherein The second diaphragm comprises a third folded ring and a reinforcing part, the third folded ring surrounds the reinforcing part, and An outer contour of the reinforcing part is circular, a diameter of the outer contour is D1, the through hole is a circular hole, a diameter of the through hole is D2, and D2≥0.3D1.

7. The sound emitting monomer according to claim 1, wherein ​ ​ The second diaphragm comprises a third folded ring and a reinforcing part, the third folded ring is arranged around the reinforcing part, wherein, The through hole has a first projection area S1 in a projection of a vibration direction of the vibration system to a plane perpendicular to the vibration direction, the reinforcing part has a second projection area S2 in a projection of the vibration direction of the vibration system to the plane perpendicular to the vibration direction, S1 is greater than or equal to 8.5%*S2.

8. The sound production unit according to claim 3, wherein The connecting piece is annular, the first diaphragm, the support, the edge yoke plate, the connecting piece and the center yoke plate form a first cavity, the first cavity is a closed cavity, a first leakage hole is arranged on the sound production unit and communicates the first cavity with the outside.

9. The sound production unit according to claim 8, wherein The center magnetic circuit comprises a center magnet and a center magnetic conducting plate, the edge magnetic circuit comprises an edge magnet and an edge magnetic conducting plate, the second magnetic gap is formed between the center magnetic conducting plate and the edge yoke plate, the first magnetic gap is formed between the edge magnetic conducting plate and the center yoke plate, the edge magnetic conducting plate is injection molded on the support, and the first leakage hole is formed by removing the edge magnetic conducting plate and the corresponding support area.

10. The sound production unit according to claim 1, wherein A back cover is further arranged, the back cover is located on a side of the second diaphragm away from the first diaphragm, a second cavity is formed between the second diaphragm and the back cover, and a second leakage hole is arranged on the back cover and communicates the second cavity with the outside.

11. An electronic device comprising a housing having a receiving cavity and a sound emitting unit disposed in the receiving cavity, characterized in that, The sound production unit adopts the sound production unit according to any one of claims 1-10, the sound production unit comprises the first diaphragm and the second diaphragm, wherein The sound production unit divides the accommodation cavity into a front cavity and a rear cavity which are isolated from each other, a sound outlet hole is arranged on the shell and communicates with the front cavity, and sound waves of the first diaphragm and the second diaphragm are radiated to the outside through the sound outlet hole.

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