Sound production monomer and electronic equipment

Abstract

The utility model provides a sounding monomer and an electronic device. The sounding monomer comprises a support; the magnetic circuit system is connected with the bracket and is provided with a first magnetic gap and a second magnetic gap; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm which are connected with the two sides of the support, and a first voice coil and a second voice coil which are connected with the first vibrating diaphragm and the second vibrating diaphragm, and the first voice coil and the second voice coil are located in the first magnetic gap and the second magnetic gap respectively; the first vibrating diaphragm comprises a first folding ring, a second folding ring and a vibrating part, the vibrating part is connected with the first voice coil, and the first folding ring is connected with the magnetic circuit system; a through hole is formed in the center of the magnetic circuit system, the first folding ring surrounds the through hole, sound waves of the second vibrating diaphragm radiate outwards through the through hole, and the sound waves of the first vibrating diaphragm and the second vibrating diaphragm radiate outwards on the same side of the sound production single body. According to the utility model, the problem that the vibration area and the vibration displacement of the existing sounding monomer cannot meet the requirements of wearable audio products such as OWS earphones can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sound production, and more specifically, to a sound generating element and an electronic device. Background Art

[0002] In recent years, with the development of intelligent wearable electronic products, the requirements for the performance of individual components in intelligent wearable products have become increasingly high. In particular, the requirements for OWS (Open Wearable Stereo, which means fully open wearable headphones) Bluetooth headsets are different from those of TWS (True Wireless Stereo, which means true wireless stereo). Since the whole machine aims to reflect the convenience and comfort of wearing, it adopts a non-in-ear method, so it is extremely urgent to improve the performance of the sound generating element.

[0003] Traditional Driver designs all generate sound through single-sided vibration. In the limited cavity of the whole machine, it is very difficult to increase the vibration area and vibration displacement. Or in some double-sided diaphragm structures, the sound guiding channels are often arranged around the sound generating element, occupying a relatively large radial dimension of the sound generating element, resulting in a reduction in the design space of the vibration system, and further a reduction in the vibration area. Therefore, the room for improving the performance of the sound generating element is relatively limited and cannot meet the requirements of existing wearable audio products such as OWS. Summary of the Utility Model

[0004] In view of the above problems, the purpose of the present utility model is to provide a sound generating element and an electronic device to solve the problem that the vibration area and vibration displacement of the existing sound generating element cannot meet the requirements of wearable audio products such as OWS headphones.

[0005] The present utility model provides a sound generating element, including: a bracket; and,

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

[0007] a vibration system, including a first diaphragm and a second diaphragm connected to both sides of the bracket, a first voice coil connected to the first diaphragm, and a second voice coil connected to the second diaphragm. The first voice coil is located in the first magnetic gap, and the second voice coil is located in the second magnetic gap; wherein,

[0008] the first diaphragm includes a first surround located inside, a second surround located outside the first surround, and a vibration part arranged between the first surround and the second surround. The second surround is connected to the bracket, the vibration part is connected to the first voice coil, and the first surround is connected to the magnetic circuit system;

[0009] A through-hole is provided at the center of the magnetic circuit system. Among them, the first surround surrounds the through-hole, the sound wave of the second diaphragm radiates outward through the through-hole, and the sound waves of the first diaphragm and the second diaphragm radiate outward on the same side of the sound generating element.

[0010] In addition, a preferred structure is that the first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves of the same phase outward.

[0011] In addition, a preferred structure is that the magnetic circuit system includes a yoke, a central magnetic circuit and a side magnetic circuit provided on the yoke. The yoke includes a central yoke plate and a side yoke plate located outside the central yoke plate. The central yoke plate and the side yoke plate are not coplanar, and a connecting member is provided to connect the central yoke plate and the side yoke plate; among them,

[0012] The central magnetic circuit is provided on the central yoke plate and forms the second magnetic gap with the side yoke plate. The side magnetic circuit is provided on the side yoke plate and forms the first magnetic gap with the central yoke plate. The through-hole penetrates the central yoke plate and the central magnetic circuit.

[0013] In addition, a preferred structure is that the central magnetic circuit includes a central magnet and a central magnetic conductive plate, the side magnetic circuit includes a side magnet and a side magnetic conductive plate, the second magnetic gap is formed between the central magnetic conductive plate and the side yoke plate, and the first magnetic gap is formed between the side magnetic conductive plate and the central yoke plate; and / or,

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

[0015] In addition, a preferred structure is that the central yoke plate has an extension part bent and extended in the direction close to the first diaphragm, and the extension part is connected to the first surround; or,

[0016] The central yoke plate is in a flat plate shape, and a support member is provided on one side of the central yoke plate close to the first diaphragm, and the support member is connected to the first surround.

[0017] In addition, a preferred structure is that the second diaphragm includes a third surround and a reinforcing part, and the third surround is arranged to surround the reinforcing part. Among them,

[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, a preferred structure is that the second diaphragm includes a third surround and a reinforcing part, and the third surround is arranged to surround the reinforcing part. Among them,

[0020] The projection of the through-hole on a plane perpendicular to the vibration direction of the vibration system has a first projected area S1, and the projection of the reinforcing part on a plane perpendicular to the vibration direction of the vibration system has a second projected area S2, where S1 ≥ 8.5% * S2.

[0021] In addition, a preferred structure is that the connecting member is annular, and a first cavity is formed between the first diaphragm, the bracket, the side yoke plate, the connecting member, and the central yoke plate. The first cavity is a sealed cavity, and a first leakage hole communicating the first cavity with the outside is provided on the sounding unit.

[0022] In addition, a preferred structure is that the central magnetic circuit includes a central magnet and a central magnetic conductive plate, the side magnetic circuit includes a side magnet and a side magnetic conductive plate, a second magnetic gap is formed between the central magnetic conductive plate and the side yoke plate, a first magnetic gap is formed between the side magnetic conductive plate and the central yoke plate, the side magnetic conductive plate is injection-molded on the bracket, and the first leakage hole is formed by removing material from the side magnetic conductive plate and the corresponding bracket area.

[0023] In addition, a preferred structure is that a rear cover is further included. The rear cover is located on the side of the second diaphragm away from the first diaphragm, a second cavity is formed between the second diaphragm and the rear cover, and a second leakage hole communicating the second cavity with the outside is provided on the rear cover.

[0024] The present utility model also provides an electronic device, including a housing having a receiving cavity and a sounding unit disposed in the receiving cavity. Among them, the sounding unit is the above-mentioned sounding unit, and the sounding unit includes a first diaphragm and a second diaphragm. Among them,

[0025] The sounding unit divides the receiving cavity into a mutually isolated front cavity and rear cavity. An acoustic outlet hole communicating with the front cavity is provided on the housing, and the sound waves of the first diaphragm and the second diaphragm are radiated to the outside through the acoustic outlet hole.

[0026] As can be seen from the above technical solutions, for the sounding unit and the electronic device provided by the present utility model, two vibration systems are combined with one magnetic circuit system. The voice coils of the two vibration systems are misaligned and cross each other with a common magnetic circuit system. A through-hole is provided in the center of the magnetic circuit system. One of the vibration systems is arranged around the through-hole, and the sound waves of the diaphragm of the other vibration system are radiated outward through the through-hole, and the sound waves of the two vibration systems are radiated outward on the same side of the sounding unit, so as to realize the same-side sound emission of the double-sided diaphragms without increasing the external dimensions, and increase the vibration area of the vibration system, thereby achieving the purpose of performance improvement.

[0027] To achieve the above and related purposes, one or more aspects of the present utility model include features that will be described in detail later. The following description and the accompanying drawings detail certain exemplary aspects of the present utility model. However, these aspects only indicate some of the various ways in which the principles of the present utility model can be used. In addition, the present utility model aims to include all these aspects and their equivalents. Description of the Drawings

[0028] By referring to the following content in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present utility model, other purposes and results of the present utility model will become more apparent and easier to understand. In the drawings:

[0029] Figure 1 Schematic exploded view of the sound generating element according to Embodiment 1 of the present utility model;

[0030] Figure 2 Cross-sectional view of the sound generating element according to Embodiment 1 of the present utility model;

[0031] Figure 3 Schematic exploded view of the sound generating element according to Embodiment 2 of the present utility model;

[0032] Figure 4 Cross-sectional view of the sound generating element according to Embodiment 2 of the present utility model;

[0033] Figure 5 Schematic exploded view of the sound generating element according to Embodiment 3 of the present utility model;

[0034] Figure 6 Cross-sectional view of the sound generating element according to Embodiment 3 of the present utility model;

[0035] Figure 7 Schematic exploded view of the sound generating element according to Embodiment 4 of the present utility model;

[0036] Figure 8 Cross-sectional view of the sound generating element according to Embodiment 4 of the present utility model;

[0037] Figure 9 Schematic three-dimensional structure view of the electronic device according to the embodiment of the present utility model;

[0038] Figure 10 、 Figure 11 Schematic three-dimensional structure views of the sound generating element according to the embodiment of the present utility model respectively.

[0039] The reference numerals therein include: 1, first diaphragm; 11, first surround; 12, second surround; 13, vibrating part,

[0040] 2, second diaphragm; 21, third surround; 22, reinforcing part,

[0041] 3. First voice coil, 4. Second voice coil,

[0042] 5. Magnetic circuit system, 51. Side magnetic conductive plate, 52. Central magnet, 53. Central magnetic conductive plate, 54. Side magnet, 55. Yoke, 551. Central yoke plate, 552. Side yoke plate, 553. Magnetic conductive yoke plate, 554. Extension part, 10. Support member, 20. Magnet, 30. Through hole,

[0043] 6. Bracket, 61. First leakage hole,

[0044] 71. First positioning ring, 72. Second positioning ring, 73. Third positioning ring,

[0045] 8. Rear cover, 81. Second leakage hole,

[0046] 91. Upper shell, 92. Lower shell, 911. Sound outlet hole, 921. Third leakage hole.

[0047] In all the drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed implementation manners

[0048] In the following description, for the purpose of illustration, in order to provide a comprehensive understanding of one or more embodiments, many specific details are set forth. However, it is obvious that these embodiments can also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for the convenience of describing one or more embodiments.

[0049] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by 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", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0050] Aiming at the problem that the vibration area and vibration displacement of the existing sounding element cannot meet the requirements of wearable audio products such as OWS headphones proposed above, the present utility model provides a sounding element and an electronic device.

[0051] The following will describe in detail the specific embodiments of the present utility model with reference to the drawings.

[0052] To illustrate the structure of the sounding element provided by the present utility model,Figures 1 to 8 , Figure 10 and Figure 11 respectively exemplarily label the structure of the sound generating element from different perspectives. Specifically, Figure 1 shows the exploded structure diagram of the sound generating element according to the first embodiment of the present invention; Figure 2 shows the sectional structure of the sound generating element according to the first embodiment of the present invention; Figure 3 shows the exploded structure of the sound generating element according to the second embodiment of the present invention; Figure 4 shows the sectional structure of the sound generating element according to the second embodiment of the present invention; Figure 5 shows the exploded structure of the sound generating element according to the third embodiment of the present invention; Figure 6 shows the sectional structure of the sound generating element according to the third embodiment of the present invention; Figure 7 shows the schematic diagram of the exploded structure of the sound generating element according to the fourth embodiment of the present invention; Figure 8 shows the sectional structure of the sound generating element according to the fourth embodiment of the present invention; Figure 10 , Figure 11 respectively show the three - dimensional structure of the sound generating element of the embodiments of the present invention.

[0053] As Figures 1 to 8 , Figure 10 and Figure 11 collectively show, the sound generating element provided by the present invention includes a bracket 6, a magnetic circuit system 5 and a vibration system. The magnetic circuit system 5 is connected to the bracket 6, and the magnetic circuit system 5 has a first magnetic gap and a second magnetic gap;

[0054] The vibration system is connected to the bracket 6 and includes a first diaphragm 1 and a second diaphragm 2 connected to both sides of the bracket 6, a first voice coil 3 connected to the first diaphragm 1, and a second voice coil 4 connected to 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. Among them, the first diaphragm 1 includes a first surround 11 located inside, a second surround 12 located outside the first surround 11, and a vibration part 13 arranged between the first surround 11 and the second surround 12. The vibration part 12 is connected to the first voice coil 3, and the first surround 11 is connected to the magnetic circuit system 5;

[0055] A through - hole 30 is provided at the center of the magnetic circuit system 5. Among them, the first surround 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 on the same side of the sound generating element.

[0056] Among them, the first diaphragm 1 and the second diaphragm 2 vibrate in the same direction and radiate sound waves of the same phase outward. In this way, the volume of the sound generating element can be increased.

[0057] Optionally, the bracket is cylindrical, and the outer peripheral contours of the first diaphragm 1 and the second diaphragm 2 are substantially aligned, facilitating the regular design of the shape of the sound generating element, further facilitating assembly into 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 a cylindrical bracket; the bracket is designed to be divided into a first bracket and a second bracket, the first diaphragm can be assembled through the first bracket, and the second diaphragm can be assembled through the second bracket, facilitating the assembly of the sound generating element during the assembly process. Conductive terminals can also be provided on the first bracket and the second bracket respectively, thereby facilitating the electrical connection of the first voice coil and the second voice coil to the external circuit respectively, etc.

[0058] In one embodiment, the magnetic circuit system 5 includes a yoke 55, a central magnetic circuit and a side magnetic circuit provided on the yoke 55. Among them, the yoke 55 includes a central yoke plate 551 and a side yoke plate 552 located outside the central yoke plate 551. Among them, the central yoke plate 551 and the side yoke plate 552 are not coplanar, and a connecting member is provided to connect the central yoke plate 551 and the side yoke plate. The central magnetic circuit is provided on the central yoke plate 551 and forms the second magnetic gap with the side yoke plate 552. The side magnetic circuit is provided on the side yoke plate 552 and forms the first magnetic gap with the central yoke plate 551. The through hole 30 penetrates through the central yoke plate 551 and the central magnetic circuit.

[0059] Among them, the central magnetic circuit includes a central magnet 52 and a central magnetic conductive plate 53, the side magnetic circuit includes a side magnet 54 and a side magnetic conductive plate 51, the central magnetic conductive plate 53 and the side yoke plate 552 form the second magnetic gap, and the side magnetic conductive plate 51 and the central yoke plate 551 form the first magnetic gap.

[0060] In one embodiment, the connecting member is a magnetic conductive yoke plate 553. The magnetic conductive yoke plate 553 can be integrally designed with the central yoke plate 551 and the side yoke plate 552, facilitating processing and manufacturing; or, in another embodiment, the connecting member is a magnet 20, so that the magnetic field performance of the magnetic circuit system 5 can be further improved.

[0061] In Embodiment 1 ( Figure 1 and Figure 2 ) and Embodiment 2 ( Figure 3 and Figure 4 ), the connecting member is a magnetic conductive yoke plate 553; in Embodiment 3 ( Figure 5 and Figure 6 ) and Embodiment 4 ( Figure 7 and Figure 8 ), the connecting member is a magnet 20, and the magnet 20 is an annular magnet. In specific applications, a suitable connecting member can be selected according to the actual situation.

[0062] Among them, the central yoke plate 551 has an extension portion 554 that bends and extends toward the first diaphragm 1, and the extension portion 544 is connected to the first surround 11; the central yoke plate 551 is integrally formed with the inner edge of the extension portion 554 and the first surround 11, which is beneficial to simplifying the number of components and improving the positioning accuracy during assembly. Alternatively, the central yoke plate 551 is in a flat plate shape, and a support member 10 is provided on one side of the central yoke plate 551 close to the first diaphragm 1, and the support member 10 is connected to the first surround 11; the first surround 11 is connected to the central yoke plate 551 through the support member 10, reducing the processing difficulty of the magnetic yoke 55 and facilitating assembly.

[0063] In Embodiment 1 ( Figure 1 and Figure 2 ) and Embodiment 3 ( Figure 5 and Figure 6 ), the extension portion 544 and the central yoke plate 551 are integrally formed. In Embodiment 2 ( Figure 3 and Figure 4 ) and Embodiment 4 ( Figure 7 and Figure 8 ), the central yoke plate 551 and the support member 10 are not integrally designed. The support member 10 is in a ring structure and is connected to the first surround 11. In specific applications, a suitable design structure can be selected according to actual conditions, and it is not limited to a certain way.

[0064] In an embodiment of the present utility model, the second diaphragm 2 includes a third surround 21 and a reinforcing portion 22, and the third surround 21 is disposed around the reinforcing portion 22. Among them, 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 sound waves of the second diaphragm. Through the above diameter design method, it can ensure the smooth transmission of sound waves of the second diaphragm 2 and reduce air flow noise.

[0065] Alternatively, the projection of the through hole 30 along the vibration direction of the vibration system onto a plane perpendicular to the vibration system is defined as the first projected area S1, and the projection of the reinforcing portion 22 along the vibration direction of the vibration system onto a plane perpendicular to the vibration system is defined as the second projected area S2, and S1≥8.5%*S2. Through the above design method of the projected area, it can ensure the smooth transmission of sound waves of the second diaphragm 2 and reduce air flow noise. In specific applications, a suitable structural design is selected according to actual requirements to ensure the smooth transmission of sound waves of the second diaphragm 2 and reduce air flow noise.

[0066] In an embodiment of the present utility model, the connecting member is annular. A first cavity is formed among the first diaphragm 1, the bracket 6, the side yoke plate 552, the connecting member, and the central yoke plate 551. The first cavity is a sealed cavity, and a first leakage hole 61 communicating the first cavity with the outside is provided on the sounding element. Preferably, there are multiple first leakage holes 61, and the multiple first leakage holes 61 are symmetrically arranged along the circumferential direction of the sounding element.

[0067] Optionally, the central magnetic circuit includes a central magnet 52 and a central magnetic conductive plate 53, and the side magnetic circuit includes a side magnet 54 and a side magnetic conductive plate 51. A second magnetic gap is formed between the central magnetic conductive plate 53 and the side yoke plate 552, and a first magnetic gap is formed between the side magnetic conductive plate 51 and the central yoke plate 551. The side magnetic conductive plate 51 is injection-molded on the bracket 6, and the first leakage hole 61 is formed by removing material from the side magnetic conductive plate 51 and the corresponding bracket area. In an embodiment of the present utility model, by removing material from the side magnetic conductive plate 51 and the bracket 6, the first leakage hole 61 does not additionally occupy the radial dimension of the sounding element so as to maximize the radial dimension of the sounding element, or the size of the leakage hole can be increased under the limited size of the sounding element to balance the internal pressure.

[0068] Among them, the sounding element further includes a rear cover 8, and the rear cover 8 is 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 rear cover 8, and a second leakage hole 81 communicating the second cavity with the outside is provided on the rear cover 8. Among them, the rear cover is made of metal material, which is convenient for strongly supporting the sounding element during the assembly process of the sounding element and also reduces the occupation of the overall machine size. In specific applications, a suitable number of leakage holes is set according to the actual situation, and it is not limited to a fixed number.

[0069] In addition, in an embodiment of the present utility model, positioning rings for positioning can be provided between the second folding ring 12, the third folding ring 22 and the bracket 6, and between the first folding ring 11 and the support member 10. Specifically, the positioning ring can be a steel ring. Specifically, a first positioning ring 71 for positioning is provided between the second folding ring 12 and the bracket 6, a second positioning ring 72 for positioning is provided between the third folding ring 22 and the bracket 6, and a third positioning ring 73 for positioning is provided between the first folding ring 11 and the support member 10. By adopting the positioning ring, the first diaphragm 1 or the second diaphragm 2 is convenient to take during the assembly process, and at the same time, the assembly accuracy is improved, and the performance of the sounding element is improved.

[0070] The present utility model further provides an electronic device, which includes a housing having a receiving cavity and a sounding element disposed in the receiving cavity. The housing includes an upper housing 91 and a lower housing 92. The sounding element includes a first diaphragm 1 and a second diaphragm 2. The sounding element divides the receiving cavity into a front cavity and a rear cavity that are isolated from each other. In Figure 9 In the illustrated embodiment, a sound outlet hole 911 communicating with the front cavity is provided on the upper housing 91 of the housing. Sound waves of the first diaphragm 1 and the second diaphragm 2 are radiated to the outside through the sound outlet hole 911. A third leakage hole 921 is provided on the lower housing 92 of the housing for adjusting the pressure in the rear cavity.

[0071] In the embodiment of the present utility model, the shape of the housing of the electronic device may be a square structure. In specific applications, other suitable shapes such as a circle can be selected according to actual situations, and it is not limited to a specific shape.

[0072] Among them, the specific structure of the sounding element refers to the above embodiment. Since the electronic device adopts all the technical solutions of the above all embodiments, it has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0073] It can be seen from the above implementation manners that for the sounding element and the electronic device provided by the present utility model, two vibration systems are combined with one magnetic circuit system. The voice coils of the two vibration systems are misaligned and cross each other with a common magnetic circuit system. A through hole is provided at the center of the magnetic circuit system. One of the vibration systems is disposed around the through hole, and sound waves of the diaphragm of the other vibration system are radiated outward through the through hole. Moreover, the sound waves of the two vibration systems are radiated outward on the same side of the sounding element, so as to realize double-sided co-directional sound emission without increasing the external dimension, and increase the vibration area of the vibration system, thereby achieving the purpose of performance improvement.

[0074] As described above by way of example with reference to the drawings, the sounding element and the electronic device proposed according to the present utility model are described. However, those skilled in the art should understand that various improvements can be made to the above-mentioned sounding element and electronic device proposed by the present utility model without departing from the content of the present utility model. Therefore, the protection scope of the present utility model should be determined by the content of the appended claims.

Claims

1. A sound-emitting unit, characterized in that: including a bracket; and, A magnetic circuit system, connected to the bracket, having a first magnetic gap and a second magnetic gap; The vibration system comprises a first diaphragm and a second diaphragm connected to both sides of the bracket, a first voice coil connected to the first diaphragm, and a second voice coil connected to the second diaphragm, wherein the first voice coil is located in the first magnetic gap, and the second voice coil is located in the second magnetic gap; wherein, The first diaphragm includes a first fold ring located inside, a second fold ring located outside the first fold ring, and a vibration part arranged between the first fold ring and the second fold ring, the second fold ring is connected to the bracket, the vibration part is connected to the first voice coil, and the first fold ring is connected to the magnetic circuit system; A through hole is arranged at the center of the magnetic circuit system, wherein the first fold ring surrounds the through hole, the sound waves of the second diaphragm radiate outward through the through hole, and the sound waves of the first diaphragm and the second diaphragm radiate outward on the same side of the sound-emitting unit.

2. The sound-emitting unit according to claim 1, characterized in that: The first diaphragm and the second diaphragm vibrate in the same direction and radiate sound waves with the same phase outward.

3. The sound-emitting unit according to claim 1, characterized in that: The magnetic circuit system includes a yoke, a central magnetic circuit and a side magnetic circuit arranged on the yoke; wherein, The magnetic yoke includes a central yoke plate and a side yoke plate located outside the central yoke plate. The central yoke plate and the side yoke plate are not coplanar, and a connecting piece is provided to connect the central yoke plate and the side yoke plate. The central magnetic circuit is arranged at the central yoke plate and forms the second magnetic gap with the side yoke plate. The side magnetic circuit is arranged at the side yoke plate and forms the first magnetic gap with the central yoke plate. The through hole penetrates the central yoke plate and the central magnetic circuit.

4. The sound-emitting unit according to claim 3, characterized in that: The central magnetic circuit includes a central magnet and a central magnetic conductive plate, the side magnetic circuit includes a side magnet and a side magnetic conductive plate, the second magnetic gap is formed between the central magnetic conductive plate and the side yoke plate, and the first magnetic gap is formed between the side magnetic conductive plate and the central yoke plate; and / or, The connecting member is a magnetic yoke plate, or the connecting member is a magnet.

5. The sound-emitting unit according to claim 3, characterized in that: The central yoke plate has an extension portion that bends and extends toward the direction close to the first diaphragm, and the extension portion is connected to the first fold ring; or, The central yoke plate is in the shape of a flat plate. A support member is provided on a side of the central yoke plate close to the first diaphragm, and the support member is connected to the first fold ring.

6. The sound-emitting unit according to claim 1, characterized in that: The second diaphragm includes a third fold ring and a reinforcement portion, wherein the third fold ring is arranged around the reinforcement portion, wherein: The outer contour of the reinforcing portion 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.

7. The sound-emitting unit according to claim 1, characterized in that: The second diaphragm includes a third fold ring and a reinforcement portion, wherein the third fold ring is arranged around the reinforcement portion, wherein: The projection of the through hole along the vibration direction of the vibration system onto a plane perpendicular to the vibration direction has a first projection area S1, and the projection of the reinforcement portion along the vibration direction of the vibration system onto a plane perpendicular to the vibration direction has a second projection area S2, S1≥8.5%*S2.

8. The sound-emitting unit according to claim 3, characterized in that: The connecting piece is annular in shape, and a first cavity is formed between the first diaphragm, the bracket, the side yoke plate, the connecting piece and the center yoke plate. The first cavity is a closed cavity, and a first leakage hole connecting the first cavity with the outside is provided on the sound unit.

9. The sound-emitting unit according to claim 8, characterized in that: The central magnetic circuit includes a central magnet and a central magnetic conductive plate, the side magnetic circuit includes a side magnet and a side magnetic conductive plate, the second magnetic gap is formed between the central magnetic conductive plate and the side yoke plate, the first magnetic gap is formed between the side magnetic conductive plate and the central yoke plate, the side magnetic conductive plate is injection molded on the bracket, and the first leakage hole is formed by removing material from the side magnetic conductive plate and the corresponding bracket area.

10. The sound-emitting unit according to claim 1, characterized in that: It also includes a back cover, which 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 connecting the second cavity and the outside is arranged on the back cover.

11. An electronic device, comprising a housing having a receiving cavity and a sound-emitting unit arranged in the receiving cavity, characterized in that: The sound-emitting unit is a sound-emitting unit as described in any one of claims 1 to 10, and the sound-emitting unit includes the first diaphragm and the second diaphragm, wherein: The sound-emitting monomer divides the receiving cavity into a front cavity and a rear cavity isolated from each other. A sound outlet hole connected to the front cavity is arranged on the shell, and the sound waves of the first diaphragm and the second diaphragm are radiated to the outside through the sound outlet hole.

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