Sound-producing apparatus and electronic device

Abstract

The present invention relates to the technical field of electroacoustic transduction. Disclosed are a sound-producing apparatus and an electronic device. A central magnetic portion and an edge magnetic portion of a magnetic circuit system of the sound-producing apparatus respectively form a first magnetic gap and a second magnetic gap with a magnetic yoke; the second magnetic gap is arranged around the first magnetic gap; the magnetic circuit system is further provided with a through hole sequentially running through the central magnetic portion and the magnetic yoke, and the first magnetic gap is arranged around the through hole; a first diaphragm and a second diaphragm are located on two opposite sides of the magnetic circuit system; the inner peripheral edge of the second diaphragm is connected to the magnetic circuit system, and the inner peripheral edge of the first diaphragm is provided with a third through hole in communication with the through hole; a first voice coil and a second voice coil are respectively suspended in the first magnetic gap and the second magnetic gap; the outer peripheral edge of the first diaphragm comprises at least one straight edge and at least one arc-shaped edge, and the straight edge is connected to the arc-shaped edge. The sound-producing apparatus of the present invention can achieve maximum utilization of the irregular space of the whole apparatus and also increases the vibration area of a vibration system, thereby improving the performance and effect of the whole apparatus.

Description

Sound-producing devices and electronic devices Technical Field

[0001] This invention relates to the field of electroacoustic transduction technology, and in particular to a sound-generating device and an electronic device using the sound-generating device. Background Technology

[0002] In recent years, with the development of smart wearable electronic products, the requirements for the performance of individual units in smart wearable products have become increasingly higher. In particular, the requirements for OWS (Open Wearable Stereo) Bluetooth headphones are different from those for TWS (True Wireless Stereo) headphones. Because the whole device adopts an in-ear design to reflect the convenience and comfort of wearing, it is urgent to improve the performance of the sound-producing unit.

[0003] Traditional driver designs typically involve single-sided vibration for sound generation. Within the limited space of the entire enclosure, it's difficult to maximize the vibrating area and displacement. Furthermore, the relatively regular shape of existing loudspeakers means that, when the available space is irregular, the space allocated to the electronic components cannot be maximized, nor can the diaphragm's surface area (Sd) be maximized, resulting in significant performance degradation. Therefore, designing loudspeakers that maximize the use of irregular spaces within the electronic components and improve their performance is a pressing technical challenge. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and an electronic device, which aims to provide a sound-generating device that increases the effective vibration area. This sound-generating device not only maximizes the use of the irregular space of the whole machine, but also increases the effective vibration area, realizes the effective superposition of double-sided sound generation, reduces assembly difficulty, and improves the performance and effect of the whole machine.

[0005] To achieve the above objectives, the present invention provides a sound-generating device, the sound-generating device comprising:

[0006] shell;

[0007] A magnetic circuit system connected to the outer casing includes a central magnetic part, a side magnetic part, and a magnetically conductive yoke connecting the central magnetic part and the side magnetic part. A first magnetic gap is formed between the central magnetic part and the magnetically conductive yoke, and a second magnetic gap is formed between the side magnetic part and the magnetically conductive yoke. The second magnetic gap surrounds the first magnetic gap. The magnetic circuit system also includes a through hole that sequentially passes through the central magnetic part and the magnetically conductive yoke, and the first magnetic gap surrounds the through hole.

[0008] A vibration system comprising a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil, wherein the first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system, the outer periphery of the first diaphragm is connected to the outer shell and is opposite to and spaced from the magnetic circuit system, the outer periphery of the second diaphragm is connected to the outer shell, the inner periphery of the second diaphragm is connected to the magnetic circuit system, and the inner periphery of the second diaphragm is provided with a third through hole communicating with the through hole, one end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap;

[0009] The outer periphery of the first diaphragm includes at least one straight edge and at least one arc-shaped edge, the straight edge being connected to the arc-shaped edge. The sound-generating device has a first side of the second diaphragm facing away from the first diaphragm and a second side of the first diaphragm facing away from the second diaphragm. Sound waves from the first diaphragm facing the first side radiate outward through the through hole and the third through hole, and together with the sound waves from the second diaphragm facing the first side, radiate towards the first side.

[0010] In one embodiment, the outer periphery of the first diaphragm includes a straight edge and an arc-shaped edge, the straight edge and the arc-shaped edge being connected, and the first diaphragm being symmetrically arranged along the center line of the straight edge; or, the outer periphery of the first diaphragm includes two straight edges and two arc-shaped edges, the two ends of each straight edge being connected to one end of each of the two arc-shaped edges, and the two ends of each arc-shaped edge being connected to one end of each of the two straight edges; wherein, the two straight edges are symmetrically arranged, and the two arc-shaped edges are symmetrically arranged.

[0011] And / or, the end face of the housing connected to the first diaphragm includes at least one straight edge and at least one arc-shaped portion, the straight edge being connected to the straight edge and the arc-shaped edge being connected to the arc-shaped portion.

[0012] In one embodiment, the first diaphragm includes a surround portion and a dome, the surround portion is disposed around the dome, the outer edge of the surround portion is connected to the housing, and the first voice coil is connected to the dome; wherein, the outer contour of the dome is similar to the outer contour of the surround portion;

[0013] And / or, the second diaphragm includes an inner folded ring, a vibrating part and an outer folded ring connected in sequence, the inner periphery of the inner folded ring is connected to the magnetic circuit system and is provided with the third through hole, the outer side of the outer folded ring is connected to the outer shell, and the second voice coil is connected to the vibrating part; wherein, the second diaphragm also includes a vibrating plate, the vibrating plate being disposed between the vibrating part and the second voice coil.

[0014] In one embodiment, the magnetic yoke includes a first base plate, a first side plate, and a first top plate. The first top plate and the first base plate are connected to the two ends of the first side plate along the vibration direction of the vibration system. The periphery of the first base plate is connected to the outer shell. The central magnetic part is disposed on the first top plate and is spaced apart from the first side plate to form the first magnetic gap. The edge magnetic part is disposed on the first base plate and is spaced apart from the first side plate to form the second magnetic gap. The through hole sequentially penetrates the central magnetic part and the first top plate.

[0015] The magnetic yoke further includes a support plate formed by bending and extending the inner periphery of the first top plate adjacent to the through hole in a direction away from the central magnetic part, and the inner periphery of the second diaphragm is connected to the end of the support plate away from the first top plate.

[0016] In one embodiment, the magnetic yoke includes a first top plate, a first bottom plate, and a first side plate connecting the first top plate and the first bottom plate. The first bottom plate is connected to the outer shell. The central magnetic part is disposed on the first top plate and spaced apart from the first side plate to form the first magnetic gap. The edge magnetic part is disposed on the first bottom plate and spaced apart from the first side plate to form the second magnetic gap.

[0017] The magnetic circuit system further includes a support member, which is located on the side of the first top plate facing away from the central magnetic part and forms an airflow cavity with the first top plate. The through hole passes through the central magnetic part and the first top plate in sequence and communicates with the airflow cavity. The support member has a second through hole that connects the airflow cavity and the third through hole. The inner periphery of the second diaphragm is connected to the support member. The first top plate also has a first through hole that connects the first magnetic gap and the airflow cavity.

[0018] In one embodiment, the support member includes a second top plate, a second side plate disposed around the periphery of the second top plate, and a second bottom plate extending outward from the end of the second side plate away from the second top plate. The second bottom plate is connected to the side of the first top plate opposite to the central magnet, so that the second top plate, the second side plate, and the first top plate enclose the airflow cavity. The second top plate is provided with a second through hole. The inner periphery of the first diaphragm is connected to the side of the second top plate opposite to the airflow cavity, so that the third through hole communicates with the second through hole.

[0019] Wherein, there is one second through hole, and the second through hole is connected to the third through hole; or, there are multiple second through holes, and the multiple second through holes are spaced apart; and / or, the area of ​​the second top plate is defined as S3, and the opening area of ​​the second through hole is defined as S4, S4 = (10%~80%)S3; and / or, the support member is a metal part, and the second bottom plate is bonded or welded to the magnetic yoke; or, the support member is an injection molded part, and the support member and the magnetic yoke are integrally injection molded.

[0020] In one embodiment, a first cavity is formed between the second diaphragm, the housing, and the magnetic circuit system, and the housing is provided with a first leakage hole communicating with the first cavity and the outside;

[0021] The sound waves from the second diaphragm facing the second side radiate outward through the first leakage hole, and together with the sound waves from the first diaphragm facing the second side radiate towards the second side.

[0022] In one embodiment, the outer casing includes a first casing and a second casing connected to each other. The end of the first casing away from the second casing is connected to the outer periphery of the first diaphragm, and the side of the second casing opposite to the first casing is connected to the outer periphery of the second diaphragm. The outer periphery of the magnetic yoke is connected to the first casing.

[0023] Wherein, the first housing is provided with the first leakage hole, the first leakage hole penetrates the surface of the first housing facing the second side, the first leakage hole is located on the outside of the first diaphragm and is provided corresponding to a straight edge; or, the first leakage hole is provided on the side wall of the first housing or the second housing; or, the first leakage hole is formed at the connection between the first housing and the second housing.

[0024] In one embodiment, a support platform is provided on the inner wall of the first housing. The outer periphery of the magnetic yoke and the outer periphery of the first diaphragm are respectively located on both sides of the support platform. The outer contour of the support platform is similar to the outer contour of the first diaphragm. The first leakage hole is formed between the inner wall of the first housing and the support platform.

[0025] And / or, the edge magnetic part includes an edge magnet and an edge magnetic plate stacked together, the edge magnet is connected to the magnetic yoke, the edge magnetic plate is connected to the second housing, and a leakage channel communicating with the first leakage hole is formed between the edge magnetic plate and the second housing; wherein, the edge magnetic plate and the second housing are integrally formed; or, the edge magnetic plate and the second housing are bonded together.

[0026] And / or, the first housing is provided with a first conductive element, one end of which is electrically connected to the lead of the first voice coil; the second housing is provided with a second conductive element, one end of which is electrically connected to the lead of the second voice coil; and the other end of the first conductive element is connected to the other end of the second conductive element for connection to an external circuit.

[0027] And / or, the first housing is a plastic housing, and the outer periphery of the magnetic yoke is integrally injection molded with the first housing; or, the outer periphery of the magnetic yoke is bonded to the first housing;

[0028] And / or, the sound-generating device further includes a first ventilator that covers the first leakage hole.

[0029] In one embodiment, the sound-generating device further includes a front cover, the periphery of which is connected to the outer shell and located on the side of the first diaphragm facing away from the second diaphragm. The outer periphery contour of the front cover is similar to the outer periphery contour of the first diaphragm. A second cavity is formed between the first diaphragm and the front cover. The front cover is provided with a fourth through hole communicating with the second cavity and the outside.

[0030] The sound waves from the first diaphragm facing the second side radiate outward through the fourth through hole.

[0031] In one embodiment, the outer casing is further provided with a support boss and a baffle connected to the support boss at one end facing away from the second diaphragm. The front cover includes a top cover, a side plate provided around the periphery of the top cover, and an edge extending outward from one end of the side plate away from the top cover. The edge is supported by the support boss. The surface of the baffle facing the second side protrudes beyond the surface of the edge facing the second side. The top cover is provided with the fourth through hole.

[0032] Alternatively, the front cover includes a top cover portion, a side plate portion disposed around the periphery of the top cover portion, an edge portion extending outward from one end of the side plate portion away from the top cover portion, and a bent portion formed by bending and extending the edge portion. The bent portion is connected to the outer shell, and the bent portion and the edge portion form a limiting space with the outer shell. The periphery of the first diaphragm is limited within the limiting space, and the top cover portion is provided with the fourth through hole.

[0033] In one embodiment, the first diaphragm and the second diaphragm vibrate in the same direction, radiating a first sound wave to the external environment from the first side and a second sound wave to the external environment from the second side, with the first and second sound waves having opposite phases; or, the sound-generating device is applied to an electronic device and is used to divide the space of the electronic device into an acoustically isolated front cavity and a rear cavity, the first side being connected to the front cavity and the second side being connected to the rear cavity, the first diaphragm and the second diaphragm vibrating in the same direction and radiating a first sound wave to the front cavity and a second sound wave to the rear cavity, with the first and second sound waves having opposite phases.

[0034] And / or, the second diaphragm is annular, the inner edge of the second diaphragm forms the third through hole, and the sound-generating device further includes a second venting member, the second venting member being connected to the inner edge of the second diaphragm and covering the third through hole;

[0035] And / or, the sound-generating device further includes a first positioning ring, which is disposed between the outer periphery of the first diaphragm and the outer shell;

[0036] And / or, the sound-generating device further includes a second positioning ring, which is disposed between the outer periphery of the second diaphragm and the outer shell.

[0037] The present invention also proposes an electronic device, the electronic device comprising:

[0038] Equipment housing, the equipment housing having a receiving cavity; and

[0039] The aforementioned sound-generating device is disposed within the receiving cavity, which divides the receiving cavity into a mutually isolated front cavity and a rear cavity, with a first side of the sound-generating device communicating with the front cavity;

[0040] The device housing is provided with a sound outlet hole that connects to the front cavity. Sound waves from the first and second diaphragms of the sound-generating device facing the first side are radiated to the outside through the front cavity and the sound outlet hole.

[0041] In one embodiment, the device housing is further provided with a second leakage hole, which communicates with the rear cavity;

[0042] The first and second diaphragms of the sound-generating device radiate sound waves with phase opposite to the sound waves in the front cavity into the rear cavity, and the sound waves in the rear cavity radiate to the outside through the second leakage hole.

[0043] The sound-generating device of this invention houses a magnetic circuit system and a vibration system within a shell. The magnetic circuit system comprises a central magnetic part, a side magnetic part, and a magnetically conductive yoke connecting the central and side magnetic parts. A first magnetic gap is formed between the central magnetic part and the magnetically conductive yoke, and a second magnetic gap is formed between the side magnetic part and the magnetically conductive yoke. The second magnetic gap surrounds the first magnetic gap. The vibration system comprises a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil. The first and second diaphragms are respectively located on opposite sides of the magnetic circuit system and connected to the shell. One end of the first voice coil is connected to the first diaphragm, and the other end is suspended within the first magnetic gap. One end of the second voice coil is connected to the second diaphragm, and the other end is suspended within the second magnetic gap. When current is passed through the first and second voice coils, the first and second voice coils convert electrical energy into mechanical energy within the first and second magnetic gaps formed by the magnetic circuit system, respectively, driving the first and second voice coils to vibrate the first and second diaphragms. This achieves vibration not only through a single magnetic circuit system driving two voice coils to vibrate two diaphragms. This design achieves sound generation from both diaphragms in the same direction without increasing the overall size, and also increases the vibration area of ​​the vibration system, thereby improving performance. Furthermore, by setting through holes sequentially penetrating the central magnetic part and the magnetic yoke in the magnetic circuit system, a first magnetic gap is arranged around the through holes, connecting the inner periphery of the second diaphragm to the magnetic circuit system. A third through hole connecting the through holes is provided on the inner periphery of the second diaphragm. This allows sound waves from the first diaphragm facing the first side to radiate outwards through the through holes and the third through hole, interacting with sound waves from the second diaphragm facing the first side. The sound waves radiate towards the first side together, which is beneficial for the superposition of compressed air when the first diaphragm and the second diaphragm vibrate towards the first side together, thereby improving the loudness and sensitivity of the sound-generating device. Furthermore, by setting the outer periphery of the first diaphragm to include at least one straight edge and at least one arc-shaped edge, with the straight edge and the arc-shaped edge connected, the outer contour of the first diaphragm presents a non-circular structure, thereby enabling the sound-generating device to be adapted to the irregular space reserved in the whole machine, so as to maximize the utilization of the irregular space and enable the first diaphragm to maximize the effective vibration area (Sd) of the diaphragm. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 is a structural schematic diagram of an embodiment of the sound-generating device provided by the present invention;

[0046] Figure 2 is a cross-sectional schematic diagram of an embodiment of the sound-generating device provided by the present invention;

[0047] Figure 3 is an exploded view of an embodiment of the sound-generating device provided by the present invention;

[0048] Figure 4 is a top view of an embodiment of the sound-generating device provided by the present invention with the front cover removed.

[0049] Figure 5 is a structural schematic diagram of another embodiment of the sound-generating device provided by the present invention;

[0050] Figure 6 is a structural schematic diagram from another perspective of another embodiment of the sound-generating device provided by the present invention;

[0051] Figure 7 is a cross-sectional schematic diagram of another embodiment of the sound-generating device provided by the present invention;

[0052] Figure 8 is a top view of another embodiment of the sound-generating device provided by the present invention with the front cover removed.

[0053] Figure 9 is a partial cross-sectional schematic diagram of another embodiment of the sound-generating device provided by the present invention;

[0054] Figure 10 is an exploded view of the outer shell in one embodiment of the sound-generating device provided by the present invention;

[0055] Figure 11 is a schematic diagram of the structure of the magnetic yoke in one embodiment of the sound-generating device provided by the present invention;

[0056] Figure 12 is a cross-sectional schematic diagram of the magnetic yoke in one embodiment of the sound-generating device provided by the present invention;

[0057] Figure 13 is a cross-sectional schematic diagram of the magnetic yoke in another embodiment of the sound-generating device provided by the present invention;

[0058] Figure 14 is a schematic diagram of the structure of the support member in one embodiment of the sound-generating device provided by the present invention;

[0059] Figure 15 is a schematic diagram of the structure of the first diaphragm in an embodiment of the sound-generating device provided by the present invention;

[0060] Figure 16 is a schematic diagram of the structure of the first diaphragm in another embodiment of the sound-generating device provided by the present invention;

[0061] Figure 17 is a schematic diagram of the structure of the front cover in one embodiment of the sound-generating device provided by the present invention;

[0062] Figure 18 is a schematic diagram of an embodiment of the electronic device provided by the present invention;

[0063] Figure 19 is a cross-sectional schematic diagram of an embodiment of the electronic device provided by the present invention.

[0064] Figure 20 is a cross-sectional schematic diagram of another embodiment of the electronic device provided by the present invention.

[0065] Reference numerals in the attached figures: 100, Sound-generating device; 1, Outer shell; 11, First housing; 111, First leakage hole; 112, Support platform; 113, Support boss; 114, Retaining wall; 12, Second housing; 121, Leakage channel; 13, First cavity; 2, Magnetic circuit system; 21, Magnetic yoke; 211, First top plate; 2111, Protrusion; 2112, Support; 2113, Inclined surface; 2114, First passage. 2115. Hole; 212. Airflow channel; 212. First base plate; 2121. Clearance groove; 213. First side plate; 214. Support plate; 22. Central magnetic part; 221. Central magnet; 222. Central magnetic guide plate; 23. Side magnetic part; 231. Side magnet; 232. Side magnetic guide plate; 24. Support member; 241. Airflow cavity; 242. Second top plate; 2421. Second through hole; 243. Second side plate 244. Second base plate; 25. First magnetic gap; 26. Second magnetic gap; 27. Through hole; 3. Vibration system; 31. First diaphragm; 311. Wrapped section; 312. Dome; 313. Straight edge; 314. Arc edge; 32. Second diaphragm; 321. Inner wrapped section; 322. Vibrating section; 323. Outer wrapped section; 324. Third through hole; 325. Vibrating plate; 33. First voice coil; 3 4. Second voice coil; 41. First positioning ring; 42. Second positioning ring; 6. Front cover; 61. Second cavity; 62. Fourth through hole; 63. Top cover; 64. Side plate; 65. Edge; 66. Bending part; 67. Limiting space; 700. Equipment housing; 710. Receiving cavity; 720. Sound outlet; 730. Second leakage hole; 740. Front cavity; 750. Rear cavity; 800. Electronic equipment.

[0066] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0067] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0068] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0069] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0070] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0071] In recent years, with the rapid development of consumer electronics, electronic devices such as headphones, smartphones, and VR devices have gained consumer acceptance and widespread application. Those skilled in the art have also made corresponding improvements to related supporting products, such as headphones, to meet the performance requirements of electronic products and satisfy consumers' needs for product performance.

[0072] Sound-generating devices are crucial electroacoustic transducers in consumer electronics, widely used as speakers, earpieces, and headphones. With advancements in electronic product performance, improvements in the acoustic performance of sound-generating devices are inevitable. In particular, the requirements for OWS (Open Wearable Stereo) Bluetooth headphones differ from those for TWS (True Wireless Stereo) headphones. Because these devices prioritize ease of wear and comfort, they are designed to be non-in-ear, making performance enhancements for the sound-generating devices crucial.

[0073] Traditional driver designs typically involve single-sided vibration for sound generation. Within the limited internal space of the device, it's difficult to significantly increase the vibration area and displacement, thus limiting the potential for performance improvements and failing to meet the demands of existing wearable audio products like OWS. Furthermore, the pursuit of performance enhancements has pushed product designs to their limits, maximizing space utilization and compromising reliability. This also hinders high-frequency performance, resulting in poor overall performance and sound quality.

[0074] Furthermore, the relatively regular shape design of existing loudspeakers fails to maximize the use of space within the electronic components when the overall space is irregular, and also fails to maximize the diaphragm's surface area (Sd), resulting in a significant performance loss. Therefore, designing loudspeakers that maximize the use of irregular space within the electronic components and improve their performance is a pressing technical problem that needs to be solved.

[0075] Based on the above concept and problems, the present invention proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices, which may be mobile phones, headphones, smart wearable devices, etc., and are not limited thereto.

[0076] In this embodiment, the sound-generating device 100 of the present invention uses a dual-diaphragm and dual-voice coil structure to drive two voice coils to vibrate two diaphragms through a magnetic circuit system 2 to generate sound. At the same time, it achieves sound generation with dual-sided diaphragms without increasing the external size, thereby increasing the vibration area of ​​the vibration system 3 and thus improving performance. Furthermore, the dual-sided diaphragms radiate sound waves on the same side of the sound-generating device 100, which is beneficial to improving the loudness and sensitivity of the sound-generating device 100.

[0077] Referring to Figures 1 to 17, in this embodiment of the invention, the sound-generating device 100 includes a housing 1, a magnetic circuit system 2, and a vibration system 3. The magnetic circuit system 2 is connected to the housing 1. The magnetic circuit system 2 includes a central magnetic part 22, a side magnetic part 23, and a magnetically conductive yoke 21 connecting the central magnetic part 22 and the side magnetic part 23. A first magnetic gap 25 is formed between the central magnetic part 22 and the magnetically conductive yoke 21, and a second magnetic gap 26 is formed between the side magnetic part 23 and the magnetically conductive yoke 21. The second magnetic gap 26 surrounds the first magnetic gap 25. The magnetic circuit system 2 also has a through hole 27 that sequentially passes through the central magnetic part 22 and the magnetically conductive yoke 21, and the first magnetic gap 25 surrounds the through hole 27. The vibration system 3 includes a first diaphragm 31, a second diaphragm 32, a first voice coil 33, and a second voice coil 34. The first diaphragm 31 and the second diaphragm 32 are located on opposite sides of the magnetic circuit system 2. The outer periphery of the first diaphragm 31 is connected to the housing 1 and is opposite to the magnetic circuit system 2. The second diaphragm 32 is connected to the outer periphery of the outer shell 1 and to the inner periphery of the magnetic circuit system. The inner periphery of the second diaphragm 32 is provided with a third through hole 324 that connects to the through hole 27. One end of the first voice coil 33 is connected to the first diaphragm 31 and the other end of the first voice coil 33 is suspended in the first magnetic gap 25. One end of the second voice coil 34 is connected to the second diaphragm 32 and the other end of the second voice coil 34 is suspended in the second magnetic gap 26. The outer periphery of the first diaphragm 31 includes at least one straight edge 313 and at least one arc-shaped edge 314. The straight edge 313 is connected to the arc-shaped edge 314. The sound generating device 100 has a first side of the second diaphragm 32 facing away from the first diaphragm 31 and a second side of the first diaphragm 31 facing away from the second diaphragm 32. The sound waves of the first diaphragm 31 facing the first side radiate outward through the through hole 27 and the third through hole 324, and together with the sound waves of the second diaphragm 32 facing the first side, radiate towards the first side.

[0078] In this embodiment, the sound-generating device 100 can be a single unit of a loudspeaker, and the loudspeaker can be a miniature loudspeaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound-generating device 100 are arranged opposite to each other.

[0079] Understandably, the outer casing 1 is used to install, fix, and support components such as the magnetic circuit system 2 and the vibration system 3; that is, the outer casing 1 provides a mounting base for components such as the magnetic circuit system 2 and the vibration system 3. Optionally, the outer casing 1 can be a single integral structure or formed by the cooperation of multiple separate structures; no limitation is made here.

[0080] In this embodiment, the outer shell 1 can be a frame or a frame structure, that is, the outer shell 1 has a cavity with openings at both ends. The magnetic circuit system 2 is housed in the cavity of the outer shell 1 and connected to the outer shell 1. The first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are respectively disposed on opposite sides of the magnetic circuit system 2, and the outer periphery of the first diaphragm 31 and the outer periphery of the second diaphragm 32 are respectively connected to the two ends of the outer shell 1, thus forming a double diaphragm structure. In this way, the two voice coils of the vibration system 3 are driven by one magnetic circuit system 2 to drive the two diaphragms to vibrate and produce sound. At the same time, the double-sided diaphragm can produce sound in the same direction without increasing the external size, and the vibration area of ​​the vibration system 3 is increased, thereby achieving the purpose of performance improvement.

[0081] In this embodiment, the outer casing 1 is provided with conductive terminals, and both the first voice coil 33 and the second voice coil 34 are electrically connected to the conductive terminals. This allows the sound-generating device 100 to easily connect and conduct the first voice coil 33 and the second voice coil 34 to an external circuit via the conductive terminals.

[0082] It should be noted that the sound-generating device 100 has a first side and a second side that are opposite to each other. The first side and the second side can be understood as orientation or direction. In this embodiment, as shown in Figures 1 to 3, 5 to 7 and 8, the sound-generating device 100 has a first side of the second diaphragm 32 facing away from the first diaphragm 31 and a second side of the first diaphragm 31 facing away from the second diaphragm 32.

[0083] Optionally, the sound waves from the first diaphragm 31 facing the first side and the sound waves from the second diaphragm 32 facing the first side radiate together towards the first side. This allows the sound waves from the second diaphragm 32 and the first diaphragm 31 in the vibration system 3 to be superimposed to produce sound, thereby improving the sound generation effect and performance. In this embodiment, the first diaphragm 31 and the second diaphragm 32 can be selected to vibrate in the same direction and radiate sound waves of the same phase outwards, thus increasing the volume of the sound-generating device 100.

[0084] In this embodiment, the outer casing 1 is used to house structures such as the fixed vibration system 3 and the magnetic circuit system 2, so that the sound-generating device 100 can be used as an independent component in electronic devices or sound-generating modules, which is not limited here. It is understood that the outer contour of the sound-generating device 100 can be circular or square, so that the outer contours of the outer casing 1, the magnetic circuit system 2 and the vibration system 3 are correspondingly set to be circular or square, which is designed according to actual needs and is not limited here.

[0085] Optionally, the outer shell 1 has a cylindrical structure, that is, the outer shell 1 has openings at both ends, forming a circular cylinder with openings at both ends. The outer periphery contours of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are roughly aligned and similar to the outer contour of the outer shell 1. The first diaphragm 31 and the second diaphragm 32 are respectively connected to the openings at both ends of the outer shell 1. The magnetic circuit system 2, etc., are disposed in the cavity of the outer shell 1 and located between the first diaphragm 31 and the second diaphragm 32. This facilitates the regularization of the shape of the sound generating device 100, further facilitates its assembly into the whole machine, and simplifies the reserved structure of the whole machine.

[0086] In this embodiment, as shown in Figures 1 to 10, the outer shell 1 includes a first shell 11 and a second shell 12 connected to each other. The side of the first shell 11 facing away from the second shell 12 is connected to the outer periphery of the first diaphragm 31. The end of the second shell 12 away from the first shell 11 is connected to the outer side of the second diaphragm 32. The outer periphery of the magnetic yoke 21 of the magnetic circuit system 2 is connected to the side of the first shell 11 facing away from the first diaphragm 31.

[0087] Understandably, the first housing 11 and the second housing 12 of the outer casing 1 can optionally be cylindrical, allowing the first housing 11 and the second housing 12 to be fitted and connected to form the cylindrical outer casing 1. By designing the outer casing 1 as a separate first housing 11 and second housing 12, the first diaphragm 31 can be assembled through the first housing 11, and the second diaphragm 32 can be assembled through the second housing 12, facilitating the assembly of the sound-generating device 100 during the assembly process. In this embodiment, the first housing 11 and the second housing 12 of the outer casing 1 are respectively provided with conductive terminals, thereby facilitating the electrical connection of the first voice coil 33 and the second voice coil 34 to external circuits, etc.

[0088] In one embodiment, the first housing 11 is provided with a first conductive element, one end of which is electrically connected to the lead of the first voice coil 33. The second housing 12 is provided with a second conductive element, one end of which is electrically connected to the lead of the second voice coil 34. The other end of the first conductive element is connected to the other end of the second conductive element for connection with an external circuit.

[0089] It is understandable that by providing a first conductive element and a second conductive element on the first housing 11 and the second housing 12 respectively, the first conductive element and the second conductive element can be electrically connected to the leads of the first voice coil 33 and the second voice coil 34 respectively. In this way, the external circuit can be connected and connected to the first voice coil 33 and the second voice coil 34 through the first conductive element and the second conductive element.

[0090] Optionally, the other end of the first conductive element is connected to the other end of the second conductive element. This allows the first and second conductive elements to be connected and conductive to an external circuit as a single integrated structure, thereby simplifying the circuit connection structure and improving assembly efficiency.

[0091] In this embodiment, the magnetic circuit system 2 is configured as a central magnetic part 22, a side magnetic part 23, and a magnetically conductive yoke 21 connecting the central magnetic part 22 and the side magnetic part 23. A first magnetic gap 25 is formed between the central magnetic part 22 and the magnetically conductive yoke 21, and a second magnetic gap 26 is formed between the side magnetic part 23 and the magnetically conductive yoke 21. The second magnetic gap 26 surrounds the first magnetic gap 25. This facilitates the first voice coil 33 and the second voice coil 34 of the vibration system 3 to correspond to the first magnetic gap 25 and the second magnetic gap 26, respectively. Conductive terminals are provided on the outer casing 1 so that both the first voice coil 33 and the second voice coil 34 are connected to the conductive terminals. The two voice coils are electrically connected, so that current is passed through the first voice coil 33 and the second voice coil 34, thereby converting electrical energy into mechanical energy within the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2, respectively. This mechanical energy drives the first voice coil 33 and the second voice coil 34 to vibrate the first diaphragm 31 and the second diaphragm 32, respectively. This not only drives the two voice coils to vibrate the two diaphragms through a magnetic circuit system 2 to produce sound, but also achieves sound production of both diaphragms in the same direction without increasing the external size, and increases the vibration area of ​​the vibration system 3, thereby improving performance.

[0092] To achieve the goal of sound waves from the first diaphragm 31 facing the first side and sound waves from the second diaphragm 32 facing the first side radiating together towards the first side, with the sound waves superimposed and enhanced to improve high-frequency performance, in this embodiment, a through hole 27 is provided in the magnetic circuit system 2, sequentially penetrating the central magnetic part 22 and the magnetic yoke 21. The inner periphery of the second diaphragm 32 is connected and fixed to the magnetic circuit system 2, and a third through hole 324 is provided on the inner periphery of the second diaphragm 32, connecting to the through hole 27. This allows the sound waves from the first diaphragm 31 facing the first side to radiate outward through the through hole 27 and the third through hole 324, and to radiate together with the sound waves from the second diaphragm 32 facing the first side towards the first side.

[0093] In one embodiment, the outer periphery of the first diaphragm 31 includes at least one straight edge 313 and at least one arcuate edge 314, with the straight edge 313 connected to the arcuate edge 314, so that the outer contour of the first diaphragm 31 is non-circular. It is understood that by presenting the outer contour of the first diaphragm 31 as a non-circular structure, the sound-generating device 100 can be adapted to irregular spaces reserved in the overall design, thereby maximizing the utilization of the irregular space and maximizing the effective vibrating area (Sd) of the first diaphragm 31.

[0094] In this embodiment, the outer contour of the outer shell 1 may optionally be similar to the outer contour of the first diaphragm 31. Of course, in other embodiments, the outer contour of the outer shell 1 is circular, and a connection surface or connection platform similar to the outer contour of the first diaphragm 31 is formed on the end face of the outer shell 1 where it connects to the first diaphragm 31, which is not limited here.

[0095] In one embodiment, as shown in Figures 4, 6, 8, and 10, the end face connecting the outer shell 1 to the first diaphragm 31 includes at least one straight edge and at least one arcuate portion. The straight edge 313 is connected to the straight edge, and the arcuate edge 314 is connected to the arcuate portion. It is understood that the end face connecting the outer shell 1 to the first diaphragm 31 has at least one straight edge and at least one arcuate portion, thereby utilizing the straight edge 313 of the first diaphragm 31 to connect with the straight edge of the outer shell 1, and the arcuate edge 314 of the first diaphragm 31 to connect with the arcuate portion of the outer shell 1. This improves connection stability and allows the sound-generating device 100 to be adapted to irregular spaces reserved in the overall design, maximizing the utilization of irregular spaces and maximizing the effective vibration area (Sd) of the first diaphragm 31.

[0096] The sound-generating device 100 of the present invention houses a magnetic circuit system 2 and a vibration system 3 within a housing 1. The magnetic circuit system 2 is configured as a central magnetic part 22, a side magnetic part 23, and a magnetically conductive yoke 21 connecting the central magnetic part 22 and the side magnetic part 23, such that a first magnetic gap 25 is formed between the central magnetic part 22 and the magnetically conductive yoke 21, and a second magnetic gap 26 is formed between the side magnetic part 23 and the magnetically conductive yoke 21, with the second magnetic gap 26 surrounding the first magnetic gap 25. The vibration system 3 is configured as a first diaphragm 31, a second diaphragm 32, a first voice coil 33, and a second voice coil 34, such that the first diaphragm 31 and the second diaphragm 32 are respectively disposed on opposite sides of the magnetic circuit system 2 and connected to the outer housing 1. The housing 1 is connected, and one end of the first voice coil 33 is connected to the first diaphragm 31, while the other end of the first voice coil 33 is suspended in the first magnetic gap 25. One end of the second voice coil 34 is connected to the second diaphragm 32, while the other end of the second voice coil 34 is suspended in the second magnetic gap 26. Thus, current flows through the first voice coil 33 and the second voice coil 34, causing them to convert electrical energy into mechanical energy within the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2, respectively. This drives the first voice coil 33 and the second voice coil 34 to vibrate the first diaphragm 31 and the second diaphragm 32, respectively. This not only drives two diaphragms through one magnetic circuit system 2, but also... The voice coil drives the two diaphragms to vibrate and produce sound. Simultaneously, it achieves unidirectional sound generation from both diaphragms without increasing the overall size, and increases the vibration area of ​​the vibration system 3, thereby improving performance. Furthermore, by setting a through hole 27 in the magnetic circuit system 2, sequentially penetrating the central magnetic part 22 and the magnetic yoke 21, the first magnetic gap 25 is arranged around the through hole 27, connecting the inner periphery of the second diaphragm 32 to the magnetic circuit system 2. A third through hole 324, connecting the through hole 27, is provided on the inner periphery of the second diaphragm 32. This allows sound waves from the first diaphragm 31 facing the first side to radiate outwards through the through hole 27 and the third through hole 324, interacting with the second diaphragm. The sound waves radiating towards the first side from the first diaphragm 32 together are beneficial to the superposition of compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate towards the first side, thereby improving the loudness and sensitivity of the sound generating device 100. Furthermore, by setting the outer periphery of the first diaphragm 31 to include at least one straight edge 313 and at least one arc-shaped edge 314, with the straight edge 313 connected to the arc-shaped edge 314, the outer contour of the first diaphragm 31 presents a non-circular structure, thereby enabling the sound generating device 100 to be adapted to the irregular space reserved in the whole machine, so as to maximize the utilization of the irregular space and enable the first diaphragm 31 to maximize the effective vibration area (Sd) of the diaphragm.

[0097] In one embodiment, as shown in Figures 3, 4 and 15, the outer periphery of the first diaphragm 31 includes a straight edge 313 and an arc-shaped edge 314, the straight edge 313 and the arc-shaped edge 314 are connected, and the first diaphragm 31 is symmetrically arranged along the center line of the straight edge 313.

[0098] Understandably, the outer contour of the first diaphragm 31 has a straight edge 313 and an arc-shaped edge 314, with the two ends of the straight edge 313 connected to the two ends of the arc-shaped edge 314 respectively. Optionally, the first diaphragm 31 is symmetrically arranged along the center line of the straight edge 313.

[0099] In one embodiment, as shown in Figures 8 and 16, the outer periphery of the first diaphragm 31 includes two straight edges 313 and two arc-shaped edges 314. The two ends of each straight edge 313 are respectively connected to one end of the two arc-shaped edges 314, and the two ends of each arc-shaped edge 314 are respectively connected to one end of the two straight edges 313. The two straight edges 313 are symmetrically arranged, and the two arc-shaped edges 314 are symmetrically arranged.

[0100] Understandably, the outer contour of the first diaphragm 31 has two straight edges 313 and two curved edges 314. At this time, the two straight edges 313 of the first diaphragm 31 are symmetrically arranged, and the two curved edges 314 are symmetrically arranged, so that the outer contour of the first diaphragm 31 presents a racetrack-shaped structure, which is not limited here.

[0101] In one embodiment, the first diaphragm 31 includes a folded ring portion 311 and a dome 312. The folded ring portion 311 is disposed around the dome 312. The outer edge of the folded ring portion 311 is connected to the housing 1. The first voice coil 33 is connected to the dome 312.

[0102] In this embodiment, as shown in Figures 2 to 4, 7 to 9, 15, and 16, the folded ring portion 311 and the dome 312 of the first diaphragm 31 can be integrally formed or separately configured; this is not limited here. It is understood that the folded ring portion 311 of the first diaphragm 31 can be an upwardly convex structure or a downwardly concave structure; this is not limited here. Optionally, the folded ring portion 311 protrudes in a direction away from the magnetic circuit system 2.

[0103] Understandably, the outer edge of the folded ring 311 is connected to the outer shell 1, and the first voice coil 33 is connected to the dome 312. When the first voice coil 33 vibrates, it drives the first diaphragm 31 to vibrate, thereby causing the sound waves of the first diaphragm 31 to radiate outward along the through hole 27 and the third through hole 324. This is not limited here.

[0104] In this embodiment, the outer periphery of the folded ring portion 311 of the first diaphragm 31 includes at least one straight edge 313 and at least one arcuate edge 314, with the straight edge 313 connected to the arcuate edge 314. Optionally, the outer contour of the dome 312 is similar to the outer contour of the folded ring portion 311, which is not limited here.

[0105] Of course, in other embodiments, the outer contour of the dome 312 can be circular. The through hole 27 is a circular hole. In this case, the diameter of the dome 312 is defined as D1, and the diameter of the through hole 27 is defined as D2, where D2 ≥ 0.3D1. It can be understood that the diameter of the dome 312 and the diameter of the through hole 27 directly affect the transmission of sound waves from the first diaphragm 31. Through the above diameter design, the sound waves from the first diaphragm 31 can be transmitted smoothly, reducing airflow noise.

[0106] To ensure smooth sound wave transmission from the first diaphragm 31, in one embodiment, the projected area of ​​the through hole 27 along the vibration direction of the vibration system is defined as S5, and the projected area of ​​the dome 312 along the vibration direction of the vibration system is defined as S6, where S5 ≥ 8.5% * S6. It is understood that this design of the projected area ensures smooth sound wave transmission from the first diaphragm 31 and reduces airflow noise. In practical applications, a suitable structural design should be selected based on specific requirements to ensure smooth sound wave transmission from the first diaphragm 31 and reduce airflow noise; no limitations are imposed here.

[0107] In one embodiment, as shown in Figures 1 to 3, 5, 7, and 9, the second diaphragm 32 includes an inner folded ring 321, a vibrating part 322, and an outer folded ring 323 connected in sequence. The inner periphery of the inner folded ring 321 is connected to the magnetic circuit system 2 and is provided with a third through hole 324. The outer side of the outer folded ring 323 is connected to the outer shell 1. The second voice coil 34 is connected to the vibrating part 322. The second diaphragm 32 also includes a vibrating plate 325, which is disposed between the vibrating part 322 and the second voice coil 34.

[0108] Understandably, by setting the second diaphragm 32 as a double-folded ring structure, the vibration of the second voice coil 34 facilitates the vibration of the second diaphragm 32, thereby improving the compliance of the second diaphragm 32 and enhancing its high-frequency performance. The inner side of the inner folded ring 321 of the second diaphragm 32 can be a ring structure or a flat plate structure. When the inner side of the inner folded ring 321 is a ring structure, a third through hole 324 is formed on the inner side of the inner folded ring 321; when the inner side of the inner folded ring 321 is a flat plate structure, the flat plate structure is provided with a third through hole 324, and no limitation is made here.

[0109] In this embodiment, the inner fold 321 and outer fold 323 of the second diaphragm 32 are either upwardly convex or downwardly concave structures, and are not limited thereto. It is understood that the inner fold 321 of the second diaphragm 32 protrudes in a direction far away from the support member 24, thus avoiding interference from the support member 24 when the second diaphragm 32 vibrates. Optionally, both the inner fold 321 and outer fold 323 of the second diaphragm 32 protrude in a direction away from the magnetic circuit system 2.

[0110] Optionally, the inner folding ring 321, the vibrating part 322, and the outer folding ring 323 of the second diaphragm 32 are integrally formed, which simplifies the processing steps of the second diaphragm 32 and improves the structural strength of the second diaphragm 32.

[0111] In one embodiment, as shown in Figures 2, 3, 7, and 9, the second diaphragm 32 further includes a vibrating plate 325, which is disposed between the vibrating part 322 and the second voice coil 34. It is understood that by providing the vibrating plate 325, the structural strength of the second diaphragm 32 is enhanced, the acoustic performance of the second diaphragm 32 is improved, and tearing of the second diaphragm 32 is prevented when the second voice coil 34 vibrates.

[0112] In one embodiment, a first cavity 13 is formed between the second diaphragm 32, the outer shell 1, and the magnetic circuit system 2. The outer shell 1 is provided with a first leakage hole 111 that connects the first cavity 13 to the outside. The sound waves of the second diaphragm 32 facing the second side are radiated outward through the first leakage hole 111 and together with the sound waves of the first diaphragm 31 facing the second side, radiate to the second side.

[0113] As can be understood, as shown in Figures 2, 7, and 9, by providing a first leakage hole 111 on the outer casing 1 connecting the first cavity 13 to the outside, the sound waves from the second diaphragm 32 facing the second side and the sound waves from the first diaphragm 31 facing the second side can both radiate to the second side. In this embodiment, the sound waves from the second diaphragm 32 facing the second side radiate outward through the first leakage hole 111, and together with the sound waves from the first diaphragm 31 facing the second side, they radiate to the second side.

[0114] Optionally, the outer casing 1 is provided with a first leakage hole 111 connecting the first cavity 13 and the outside, and the first leakage hole 111 penetrates the surface of the outer casing 1 facing the second side. This allows the sound waves of the second diaphragm 32 facing the second side to radiate outward through the first leakage hole 111, and together with the sound waves of the first diaphragm 31 facing the second side, radiating towards the second side. At the same time, it facilitates the assembly of the sound generating device 100 and avoids the phenomenon of clogging the first leakage hole 111 during the assembly process. It also facilitates the installation of venting components or other structures at the first leakage hole 111, simplifying the assembly process.

[0115] Optionally, when the first leakage hole 111 penetrates the surface of the housing 1 facing the second side, the first leakage hole 111 corresponds to the straight edge 313 of the first diaphragm 31 and is located on the side of the straight edge portion of the housing 1 away from the straight edge 313 of the first diaphragm 31. In this way, the straight edge portion of the housing 1 and the straight edge 313 of the first diaphragm 31 can be used to avoid the first leakage hole 111.

[0116] In this embodiment, the sound waves of the first diaphragm 31 facing the first side radiate outward through the through hole 27 and the third through hole 324, and together with the sound waves of the second diaphragm 32 facing the first side, radiate a first sound wave to the first side. The sound waves of the second diaphragm 32 facing the second side radiate outward through the first leakage hole 111, and together with the sound waves of the first diaphragm 31 facing the second side, radiate a second sound wave to the second side. Optionally, the first sound wave and the second sound wave are out of phase.

[0117] The sound-generating device 100 of this application can be used in various environments. In one embodiment, the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction. The first diaphragm 31 and the second diaphragm 32 radiate a first sound wave to the external environment facing a first side, and radiate a second sound wave to the external environment facing a second side. The first and second sound waves are out of phase. In this way, both the first and second sides of the sound-generating device 100 are connected to the external environment, and the first and second sides radiate sound waves with opposite phases to the external environment. The sound waves on both sides cancel each other out in the far field, making it suitable for environments that require far-field noise reduction and privacy protection.

[0118] In one embodiment, the sound-generating device 100 is applied to an electronic device 800 and is used to divide the space of the electronic device 800 into an acoustically isolated front cavity 740 and a rear cavity 750. A first side is connected to the front cavity 740 and a second side is connected to the rear cavity 750. A first diaphragm 31 and a second diaphragm 32 vibrate in the same direction and radiate a first sound wave to the front cavity 740 and a second sound wave to the rear cavity 750. The first sound wave and the second sound wave are out of phase.

[0119] Understandably, the first side of the first diaphragm 31 and the second diaphragm 32 communicates with the front cavity, and the second side of the first diaphragm 31 and the second diaphragm 32 communicates with the rear cavity. Electronic devices typically have a sound outlet for the sound waves from the front cavity to radiate out. When using the electronic device, the sound waves from the front cavity can be radiated out through the sound outlet and received by the user. Further, the sound waves from the rear cavity can optionally radiate out through a rear leakage hole (referred to as the second leakage hole in this application). In this way, the sound waves from the front and rear cavities can form an acoustic dipole, achieving the technical effect of reducing sound leakage. Alternatively, the sound waves from the rear cavity may not radiate outwards; the sound-generating device of this application only serves to superimpose and enhance the sound waves from the first side of the first diaphragm 31 and the second diaphragm 32, improving high-frequency performance. The appropriate method should be chosen based on the actual situation.

[0120] In the first embodiment, the magnetic yoke 21 includes a first top plate 211, a first bottom plate 212, and a first side plate 213 connecting the first top plate 211 and the first bottom plate 212. The first bottom plate 212 is connected to the outer shell 1. A central magnetic part 22 is disposed on the first top plate 211 and spaced from the first side plate 213 to form a first magnetic gap 25. A side magnetic part 23 is disposed on the first bottom plate 212 and spaced from the first side plate 213 to form a second magnetic gap 26. The magnetic circuit system 2 further includes a support member 24 for supporting... The component 24 is located on the side of the first top plate 211 facing away from the central magnetic part 22, and together with the first top plate 211, it forms an airflow cavity 241. The through hole 27 passes through the central magnetic part 22 and the first top plate 211 in sequence, and communicates with the airflow cavity 241. The support component 24 is provided with a second through hole 2421 that connects the airflow cavity 241 and the third through hole 324. The inner periphery of the second diaphragm 32 is connected to the support component 24. The first top plate 211 is also provided with a first through hole 2114 that connects the first magnetic gap 25 and the airflow cavity 241.

[0121] In this embodiment, as shown in Figures 2, 3, 7, and 14, by setting a support member 24 and setting the magnetic yoke 21 as a positive and negative tension structure, the connection area between the support member 24 and the inner edge of the second diaphragm 32 and the connection area between the central magnetic part 22 of the magnetic circuit system 2 and the magnetic yoke 21 are increased, thereby improving stability and reducing reliability risks.

[0122] Understandably, by placing the support member 24 on the side of the magnetic yoke 21 facing away from the central magnetic part 22, the support member 24 and the magnetic yoke 21 enclose an airflow cavity 241. A second through hole 2421 is provided in the support member 24, and a fifth through hole is provided in the magnetic yoke 21. The central magnetic part 22 is provided with a sixth through hole corresponding to the fifth through hole. In this way, the sixth through hole and the fifth through hole are connected in sequence to form a through hole 27.

[0123] In this embodiment, by setting the airflow cavity 241, the airflow area of ​​the first diaphragm 31 during vibration is effectively increased, thereby ensuring smoother airflow and improving the high-frequency performance of the first diaphragm 31, thereby improving the high-frequency performance of the superimposed first diaphragm 31 and second diaphragm 32.

[0124] In one embodiment, the magnetic yoke 21 is further provided with a first through hole 2114 connecting the first magnetic gap 25 and the airflow cavity 241, and the first through hole 2114 is spaced apart from the fifth through hole; wherein, the sound waves of the first diaphragm 31 facing the first side are radiated outward through the through hole 27 and the third through hole 324, and at the same time radiated outward through the first magnetic gap 25, the first through hole 2114, the airflow cavity 241, the second through hole 2421 and the third through hole 324.

[0125] In this embodiment, as shown in Figures 2, 3, 7, 11, 12, and 14, a support member 24 is provided on the side of the magnetic yoke 21 facing away from the central magnetic part 22. The support member 24 is used to connect and fix the inner periphery of the second diaphragm 32. At the same time, the support member 24 and the magnetic yoke 21 enclose an airflow cavity 241. The magnetic yoke 21 has a first through hole 2114 connecting the first magnetic gap 25 and the airflow cavity 241, and the support member 24 has a second through hole 2421 connecting the airflow cavity 241. A third through hole 324 is provided on the inner periphery of the second diaphragm 32. This makes it possible to achieve the desired effect. Sound waves from the first diaphragm 31 facing the first side radiate outwards through the first magnetic gap 25, the first through hole 2114, the airflow cavity 241, the second through hole 2421, and the third through hole 324 in sequence. That is, the first magnetic gap 25, the first through hole 2114, the airflow cavity 241, the second through hole 2421, and the third through hole 324 are sequentially connected to form an airflow channel. Furthermore, the magnetic circuit system 2 is provided with a through hole 27 connecting the airflow cavity 241, such that the through hole 27 sequentially passes through the central magnetic part 22 and the magnetic yoke 21. Thus, sound waves from the first diaphragm 31 facing the first side radiate outwards through the through hole 27 in sequence. The airflow cavity 241, the second through hole 2421, and the third through hole 324 radiate outwards. That is, the through hole 27, airflow cavity 241, second through hole 2421, and third through hole 324 are sequentially connected to form another airflow channel. This facilitates the outward radiation of sound waves from the first side of the first diaphragm 31 to one side of the second diaphragm 32 through the two airflow channels. This achieves the outward radiation of sound waves from the first diaphragm 31 and the second diaphragm 32 facing the first side on the same side (i.e., the first side) of the sound-generating device 100. This is beneficial for the superposition of compressed air during the vibration of the first diaphragm 31 and the second diaphragm 32, enhancing the sound-generating device. The loudness and sensitivity are set to 100. At the same time, the second diaphragm 32 and the central magnetic part 22 are installed and fixed using the support member 24 and the magnetic yoke 21 respectively to improve the installation stability and reduce the reliability risk. The first through hole 2114 of the magnetic yoke 21 and the through hole 27 of the magnetic circuit system 2 are respectively used in conjunction with the airflow cavity 241 formed by the magnetic yoke 21 and the support member 24 to effectively increase the airflow area when the first diaphragm 31 vibrates, thereby ensuring smoother airflow and improving the high-frequency performance of the first diaphragm 31, thereby improving the high-frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition.

[0126] In this embodiment, the magnetic yoke 21 is a metal magnetic plate. Optionally, the support member 24 is a metal part. It is understood that the support member 24 and the magnetic yoke 21 can be bonded or welded together, which is not limited here. Of course, in other embodiments, the support member 24 can be an injection molded part. The support member 24 and the magnetic yoke 21 can be integrally injection molded, which is not limited here.

[0127] Optionally, the magnetic yoke 21 can be an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form a first base plate 212, a first side plate 213, and a first top plate 211 connected in sequence. This can improve the structural strength of the magnetic yoke 21, thereby improving the installation stability. The first side plate 213 of the magnetic yoke 21 can optionally be arranged around the periphery of the first top plate 211 and at an angle to the first top plate 211. The first side plate 213 and the first top plate 211 enclose a receiving cavity. The central magnetic part 22 is disposed in the receiving cavity and connected to the first top plate 211. It is also spaced from the first side plate 213 to form a first magnetic gap 25. The first base plate 212 can optionally be connected to the end of the first side plate 213 away from the first top plate 211. The first base plate 212 extends in a direction away from the receiving cavity and is at an angle to the first side plate 213. The edge magnetic part 23 is disposed on the first base plate 212 and is spaced apart from the first side plate 213 to form a second magnetic gap 26, that is, the edge magnetic part 23 and the center magnetic part 22 are located on opposite sides of the first side plate 213.

[0128] Understandably, the through hole 27 passes through the central magnetic part 22 and the first top plate 211 in sequence. In this embodiment, the first top plate 211 is provided with a fifth through hole and a first through hole 2114.

[0129] Optionally, the first top plate 211 and the first bottom plate 212 are connected to both ends of the first side plate 213 along the vibration direction of the vibration system 3. It can be understood that the first top plate 211 and the first bottom plate 212 of the magnetic yoke 21 are distributed vertically along the vibration direction of the vibration system 3, that is, the first top plate 211 and the first bottom plate 212 have a height difference in the vibration direction of the vibration system 3. This ensures that the size of the magnetic circuit system 2 along the vibration direction of the vibration system 3 is not too large, thereby achieving a thin and light design.

[0130] In this embodiment, as shown in Figures 2, 3, 7, 11, 12, and 14, the support member 24 is disposed on the side of the first top plate 211 of the magnetic yoke 21 facing away from the central magnetic part 22, and together with the first top plate 211, forms an airflow cavity 241. The first top plate 211 is provided with a first through hole 2114 that connects the airflow cavity 241 and the first magnetic gap 25.

[0131] Understandably, the number of first through holes 2114 can be one or more. This is to maintain smooth airflow and ensure the vibration balance of the first diaphragm 31. The number of first through holes 2114 is at least two. In specific applications, different numbers of first through holes 2114 are set as needed, with each first through hole 2114 spaced apart. Optionally, there may be multiple first through holes 2114, spaced apart. In this embodiment, multiple first through holes 2114 are arranged around the central magnet 22, and are uniformly and spaced apart.

[0132] In one embodiment, the area of ​​the first top plate 211 is defined as S1, and the opening area of ​​the fifth through hole is defined as S2, where S2 = (10% to 80%)S1.

[0133] In this embodiment, by controlling the opening area of ​​the fifth through hole on the first top plate 211, it is beneficial for the sound waves of the first diaphragm 31 to radiate to the outside, while ensuring the structural strength of the magnetic yoke 21 and the connection area between the central magnetic part 22 and the first top plate 211, thereby improving stability. Optionally, the opening area S2 of the fifth through hole accounts for 10% to 80% of the area S1 of the first top plate 211. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., and is not limited here.

[0134] Understandably, if the opening area of ​​the fifth through hole is too small, it will not be conducive to the radiation of sound waves from the first diaphragm 31 to the outside; if the area of ​​the fifth through hole is too large, the bonding area between the central magnetic part 22 and the first top plate 211 will be too small, which will not be conducive to improving the connection reliability between the two.

[0135] It should be noted that the opening area of ​​the first through hole 2114 on the first top plate 211 will also affect the sound wave radiation of the first diaphragm 31 to the outside. That is, if the area of ​​the first through hole 2114 is too small, it will not be conducive to the sound wave radiation of the first diaphragm 31 to the outside. Of course, if the area of ​​the first through hole 2114 is too large, the bonding area between the central magnet 22 and the first top plate 211 will be too small, which will not be conducive to improving the connection reliability between the two.

[0136] Understandably, by controlling the opening area of ​​the first through hole 2114 on the first top plate 211, it is possible to facilitate the radiation of sound waves from the first diaphragm 31 to the outside, and to ensure the structural strength of the magnetic yoke 21 and the connection area between the central magnetic part 22 and the first top plate 211, thereby improving stability.

[0137] It should be noted that when there is only one first through hole 2114, the opening area of ​​the first through hole 2114 is the opening area of ​​the single first through hole 2114. When there are multiple first through holes 2114, the opening area of ​​the first through hole 2114 is the sum of the opening areas of the multiple first through holes 2114.

[0138] Optionally, the opening area of ​​the first through hole 2114 accounts for 10% to 80% of the area of ​​the first top plate 211. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., and is not limited here.

[0139] In this embodiment, as shown in Figures 2, 3, 7, and 9, the through hole 27 sequentially penetrates the central magnetic part 22 and the first top plate 211. The central magnetic part 22 includes a central magnet 221 and a central magnetic guide plate 222 stacked together, with the central magnet 221 connected to the first top plate 211. Optionally, the through hole 27 sequentially penetrates the central magnetic guide plate 222, the central magnet 221, and the first top plate 211.

[0140] Understandably, the central magnetic plate 222 of the central magnetic part 22 is provided with a first through hole, the central magnet 221 is provided with a second through hole, the first through hole and the second through hole are connected to form a sixth through hole, and the first top plate 211 is provided with a fifth through hole, so that the first through hole, the second through hole (i.e. the sixth through hole) and the fifth through hole are connected in sequence to form a through hole 27.

[0141] Optionally, the first through hole, the second through hole, and the fifth through hole are arranged coaxially along the vibration direction of the vibration system 3.

[0142] In this embodiment, the first through hole 2114 and the fifth through hole of the first top plate 211 are spaced apart. Optionally, there may be multiple first through holes 2114, which are spaced apart and surround the fifth through hole, and this is not limited here.

[0143] To further ensure smooth airflow beneath the first diaphragm 31 and improve its high-frequency performance, thereby enhancing the high-frequency performance of the superimposed first diaphragm 31 and second diaphragm 32, in one embodiment, the first top plate 211 includes a protrusion 2111 and a support 2112 connected to each other. The protrusion 2111 is formed by the first top plate 211 protruding towards the central magnetic part 22, so that the support 2112 surrounds the protrusion 2111. The support 2112 is provided with a first through hole 2114. The central magnetic part 22 is located on the protrusion 2111 and is spaced apart from the support 2112 to form an airflow channel 2115. The airflow channel 2115 connects the first magnetic gap 25 and the first through hole 2114. The support member 24 is connected to the side of the support 2112 facing away from the airflow channel 2115. The fifth through hole penetrates the protrusion 2111, that is, the through hole 27 sequentially penetrates the central magnetic part 22 and the protrusion 2111.

[0144] In this embodiment, as shown in Figures 2, 3, 7, 11, and 12, a protrusion 2111 protruding toward the central magnetic part 22 is provided on the first top plate 211 of the magnetic yoke 21, so that the central magnetic part 22 is located on the protrusion 2111 and spaced apart from the support part 2112 to form an airflow channel 2115. A first through hole 2114 is provided on the support part 2112. In this way, the airflow channel 2115 connects the first magnetic gap 25 and the first through hole 2114, which can ensure the smooth airflow below the first diaphragm 31, improve the high-frequency performance of the first diaphragm 31, and at the same time ensure the magnet volume of the central magnetic part 22, thereby ensuring the magnetic field strength.

[0145] Understandably, the protrusion 2111 is located in the center of the first top plate 211, which facilitates the installation and fixing of the central magnet 22. The support 2112 is arranged around the protrusion 2111, thus allowing for multiple first through holes 2114 to ensure unobstructed airflow below the first diaphragm 31. In this embodiment, the through hole 27 sequentially passes through the central magnet 22 and the protrusion 2111, meaning that the protrusion 2111 is provided with a fifth through hole.

[0146] In this embodiment, as shown in Figures 2, 3, 7, 11, and 12, an inclined surface 2113 is formed at the connection between the protrusion 2111 and the support 2112, and the first through hole 2114 sequentially passes through the support 2112 and the inclined surface 2113. It can be understood that the protrusion 2111 is formed by the first top plate 211 of the magnetic yoke 21 being recessed from the side facing the support 24 toward a direction away from the support 24, so that the side of the first top plate 211 facing the central magnetic part 22 protrudes to form the protrusion 2111, i.e., formed by stamping or stretching, which is not limited here.

[0147] Understandably, by providing a first through hole 2114 that sequentially passes through the support portion 2112 and the inclined surface 2113, the opening area of ​​the first through hole 2114 is further increased, ensuring smooth airflow below the first diaphragm 31, improving the high-frequency performance of the first diaphragm 31, and simultaneously ensuring the magnet volume of the central magnetic portion 22, thereby ensuring the magnetic field strength. Optionally, multiple first through holes 2114 are provided, spaced apart, and surrounding the protrusion 2111.

[0148] In this embodiment, the outer contours of the first top plate 211 and the central magnetic part 22 can be circular. In order to further increase the opening area of ​​the first through hole 2114, the first through hole 2114 can be an arc-shaped hole extending along the periphery of the protrusion 2111.

[0149] In one embodiment, the side of the support portion 2112 facing the support member 24 is recessed towards the airflow channel 2115 to form a support groove, and the periphery of the support member 24 is confined within the support groove. It can be understood that by recessing the periphery of the first top plate 211, the side of the support portion 2112 facing the support member 24 is recessed towards the airflow channel 2115 to form a support groove. This allows for positioning and installation of the support member 24 using the support groove, improving installation accuracy.

[0150] In one embodiment, as shown in Figures 2, 3, 7, and 9, the central magnetic part 22 includes a central magnet 221 and a central magnetic guide plate 222 stacked together. The central magnet 221 is connected to the magnetic yoke 21. It can be understood that the central magnet 221 is connected to the first top plate 211 of the magnetic yoke 21, that is, the central magnet 221 is sandwiched between the first top plate 211 and the central magnetic guide plate 222. The outer peripheries of both the central magnet 221 and the central magnetic guide plate 222 are spaced apart from the first side plate 213 of the magnetic yoke 21 to form a first magnetic gap 25.

[0151] Optionally, the central magnet 221 and the central magnetic plate 222 of the central magnetic part 22 can be circular plate-shaped or disk-shaped structures, which are not limited here.

[0152] In this embodiment, the central magnetic part 22 includes a central magnet 221 and a central magnetic guide plate 222 stacked together. The central magnet 221 is connected to the first top plate 211, and the sixth through hole sequentially passes through the central magnetic guide plate 222 and the central magnet 221. It can be understood that the central magnet 221 is connected to the protrusion 2111, and the through hole 27 sequentially passes through the central magnetic guide plate 222, the central magnet 221, and the protrusion 2111.

[0153] In one embodiment, the support member 24 includes a second top plate 242, a second side plate 243 disposed around the periphery of the second top plate 242, and a second bottom plate 244 extending outward from the end of the second side plate 243 away from the second top plate 242. The second bottom plate 244 is connected to the side of the first top plate 211 facing away from the central magnet 22, so that the second top plate 242, the second side plate 243 and the first top plate 211 surround to form an airflow cavity 241. The second top plate 242 is provided with a second through hole 2421. The inner periphery of the first diaphragm 31 is connected to the side of the second top plate 242 facing away from the airflow cavity 241, so that the third through hole 324 communicates with the second through hole 2421.

[0154] In this embodiment, as shown in Figures 2, 3, 7 and 14, the support member 24 can be selected as an integrally formed structure. The second side plate 243 is disposed around the periphery of the second top plate 242 and is set at an angle to the second top plate 242, that is, the second side plate 243 and the second top plate 242 enclose a cavity. The second bottom plate 244 is connected to the end of the second side plate 243 away from the second top plate 242 and extends in a direction away from the cavity, that is, the second bottom plate 244 and the second side plate 243 are set at an angle. In this way, the support member 24 is connected to the magnetic yoke 21 by the second bottom plate 244, thereby increasing the contact area and improving the connection stability. The second side plate 243 of the support member 24 supports the second top plate 242 away from the first top plate 211 of the magnetic yoke 21, so that the second top plate 242, the second side plate 243 and the first top plate 211 of the magnetic yoke 21 enclose an airflow cavity 241, and the second top plate 242 of the support member 24 fixes the inner periphery of the second diaphragm 32.

[0155] Optionally, the support member 24 is a metal part, and the second base plate 244 is bonded or welded to the magnetic yoke 21, that is, the second base plate 244 is bonded or welded to the first top plate 211 of the magnetic yoke 21. Of course, in other embodiments, the support member 24 is an injection molded part, and the support member 24 and the magnetic yoke 21 are integrally injection molded, that is, the support member 24 and the first top plate 211 of the magnetic yoke 21 are integrally injection molded, which is not limited here.

[0156] Understandably, the second top plate 242 of the support member 24 is provided with a second through hole 2421, so that the airflow cavity 241 communicates with the outside through the second through hole 2421 and the third through hole 324 of the second diaphragm 32. In this embodiment, the third through hole 324 of the second diaphragm 32 can be one or more. When there is only one third through hole 324, that is, the second diaphragm 32 is an annular diaphragm, the third through hole 324 is formed on the inner periphery of the second diaphragm 32, that is, the second through hole 2421 of the second top plate 242 is located within the projection range of the third through hole 324 of the second top plate 242. When there are multiple third through holes 324, the inner side of the second diaphragm 32 is flat and is attached to the second top plate 242. The inner side of the second diaphragm 32 is provided with multiple third through holes 324, and the multiple third through holes 324 are at least partially connected to the second through hole 2421, which is not limited here.

[0157] Optionally, there is one second through hole 2421, which is connected to the third through hole 324; or, there are multiple second through holes 2421, which are spaced apart.

[0158] It should be noted that when the second top plate 242 is provided with multiple second through holes 2421 and the inner side of the second diaphragm 32 is provided with multiple third through holes 324, the multiple second through holes 2421 and the multiple third through holes 324 are optionally provided in a one-to-one correspondence, which is not limited here.

[0159] In one embodiment, the area of ​​the second top plate 242 is defined as S3, and the opening area of ​​the second through hole 2421 is defined as S4, where S4 = (10% to 80%)S3.

[0160] In this embodiment, by controlling the opening area of ​​the second through hole 2421 on the second top plate 242, it is beneficial for the sound waves of the first diaphragm 31 to radiate to the outside, while ensuring the structural strength of the support member 24 and the connection area between the inner edge of the second diaphragm 32 and the second top plate 242, thereby improving stability. Optionally, the opening area S4 of the second through hole 2421 accounts for 10% to 80% of the area S3 of the second top plate 242. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., and is not limited here.

[0161] Understandably, if the area of ​​the second through hole 2421 is too small, it will not be conducive to the radiation of sound waves from the first diaphragm 31 to the outside; if the area of ​​the second through hole 2421 is too large, the bonding area between the second diaphragm 32 and the second top plate 242 will be too small, which will not be conducive to improving the connection reliability between the two.

[0162] It should be noted that when there is only one second through hole 2421, the opening area S4 of the second through hole 2421 is the opening area of ​​that single second through hole 2421. When there are multiple second through holes 2421, the opening area S4 of the second through holes 2421 is the sum of the opening areas of the multiple second through holes 2421.

[0163] In the second embodiment, the magnetic yoke 21 includes a first base plate 212, a first side plate 213, and a first top plate 211. The first top plate 211 and the first base plate 212 are connected to the two ends of the first side plate 213 along the vibration direction of the vibration system 3. The periphery of the first base plate 212 is connected to the outer shell 1. The central magnetic part 22 is disposed on the first top plate 211 and is spaced apart from the first side plate 213 to form a first magnetic gap 25. The side magnetic part 23 is disposed on the first base plate 212 and is spaced apart from the first side plate 213 to form a second magnetic gap 26. The through hole 27 passes through the central magnetic part 22 and the first top plate 211 in sequence. The magnetic yoke 21 also includes a support plate 214 formed by bending and extending the inner periphery of the first top plate 211 adjacent to the through hole 27 in a direction away from the central magnetic part 22. The inner periphery of the second diaphragm 32 is connected to the end of the support plate 214 away from the first top plate 211.

[0164] In this embodiment, as shown in Figures 9 and 13, the magnetic yoke 21 can be selected as an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form a first base plate 212, a first side plate 213, a first top plate 211 and a support plate 214 connected in sequence, which can improve the structural strength of the magnetic yoke 21 and thus improve the installation stability.

[0165] Understandably, the first side plate 213 of the magnetic yoke 21 may optionally surround the periphery of the first top plate 211 and be angled with the first top plate 211. The first side plate 213 and the first top plate 211 enclose a receiving cavity. The central magnetic part 22 is disposed within this receiving cavity and is connected to the first top plate 211. It is also spaced from the first side plate 213 to form a first magnetic gap 25. The first bottom plate 212 may optionally be connected to the end of the first side plate 213 away from the first top plate 211. The first bottom plate 212 extends in a direction away from the receiving cavity and is angled with the first side plate 213. The side magnetic part 23 is disposed on the first bottom plate 212 and is spaced from the first side plate 213 to form a second magnetic gap 26. That is, the side magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213.

[0166] Optionally, the first top plate 211 and the first bottom plate 212 are connected to both ends of the first side plate 213 along the vibration direction of the vibration system 3. It can be understood that the first top plate 211 and the first bottom plate 212 of the magnetic yoke 21 are distributed vertically along the vibration direction of the vibration system 3, that is, the first top plate 211 and the first bottom plate 212 have a height difference in the vibration direction of the vibration system 3. This ensures that the size of the magnetic circuit system 2 along the vibration direction of the vibration system 3 is not too large, thereby achieving a thin and light design.

[0167] In this embodiment, as shown in Figures 9 and 13, the support plate 214 is formed by bending and extending the inner periphery of the first top plate 211 adjacent to the through hole 27 toward the direction away from the central magnet 22. In this way, the inner periphery of the second diaphragm 32 can be connected and fixed through the support plate 214.

[0168] It should be noted that the difference between the second embodiment and the first embodiment lies in the specific structure of the magnetic yoke 21. In the first embodiment, the magnetic yoke 21 is integrally stretched to form a first base plate 212, a first side plate 213, and a first top plate 211. By additionally setting a support member 24, the second diaphragm 32 and the central magnetic part 22 are fixed by the support member 24 and the first top plate 211, respectively. Furthermore, by forming an airflow cavity 241 between the support member 24 and the first top plate 211, and by setting a first through hole 2114 on the first top plate 211 to connect the airflow cavity 241, the airflow of the first diaphragm 31 facing the first side can radiate outward through two channels, thereby ensuring smooth airflow of the first diaphragm 31, improving the high-frequency performance of the first diaphragm 31, and further improving the high-frequency performance of the first diaphragm 31 and the second diaphragm 32 after being superimposed. In the second embodiment, the magnetic yoke 21 is integrally stretched to form a first base plate 212, a first side plate 213, a first top plate 211, and a support plate 214. The second diaphragm 32 and the central magnetic part 22 are fixed by the support plate 214 and the first top plate 211 respectively to ensure connection stability.

[0169] Optionally, the first base plate 212 is provided with a clearance groove 2121 corresponding to the second magnetic gap 26. The clearance groove 2121 is used to provide clearance for the second voice coil 34. It can be understood that the clearance groove 2121 provides clearance space for the second voice coil 34, thereby improving the performance of the sound generating device 100.

[0170] In one embodiment, as shown in Figures 2, 3, 7, and 9, the edge magnetic section 23 includes a layered edge magnet 231 and an edge magnetic guide plate 232, with the edge magnet 231 connected to the magnetic yoke 21. It is understood that the edge magnet 231 is connected to the first base plate 212 of the magnetic yoke 21, that is, the edge magnet 231 is sandwiched between the first base plate 212 and the edge magnetic guide plate 232. The inner peripheries of both the edge magnet 231 and the edge magnetic guide plate 232 are spaced apart from the first side plate 213 of the magnetic yoke 21 to form a second magnetic gap 26. Optionally, the edge magnet 231 and the edge magnetic guide plate 232 of the edge magnetic section 23 can be a ring structure, which is not limited here.

[0171] To further improve connection stability, in this embodiment, the side magnetic plate 232 and the outer shell 1 are integrally formed. It is understood that the outer shell 1 can be made of metal or plastic. When the outer shell 1 is made of metal, the outer shell 1 and the side magnetic plate 232 are integrally formed, which simplifies the processing steps and improves heat dissipation. When the outer shell 1 is made of plastic, the outer shell 1 and the side magnetic plate 232 can be integrally injection molded; this is not limited here.

[0172] Optionally, the side magnetic plate 232 and the second housing 12 of the outer shell 1 are integrally formed, which is not limited here. In this embodiment, the side magnetic plate 232 is injection molded onto the outer shell 1, and the first leakage hole 111 is formed by removing material from the side magnetic plate 232 and / or the corresponding area of ​​the outer shell 1. It can be understood that by forming the first leakage hole 111 on the side magnetic plate 232 or on the outer shell 1, or simultaneously on the side magnetic plate 232 and the outer shell 1, the first leakage hole 111 does not occupy additional radial dimensions of the sound-generating device 100, or the size of the first leakage hole 111 can be increased within the limited size of the sound-generating device 100 to balance the internal pressure.

[0173] In one embodiment, the second diaphragm 32 is annular, and a third through hole 324 is formed on the inner edge of the second diaphragm 32. The sound generating device 100 also includes a second venting member, which is connected to the inner edge of the second diaphragm 32 and covers the third through hole 324.

[0174] In this embodiment, as shown in Figures 1 to 3, 5, 7, and 9, the second diaphragm 32 can be selected as an annular diaphragm. In this case, a third through hole 324 is formed on the inner edge of the second diaphragm 32, that is, a third through hole 324 is formed on the inner edge of the second diaphragm 32. It can be understood that by providing a second vent, the second vent is connected to the inner edge of the second diaphragm 32 and covers the third through hole 324. In this way, the second vent prevents external dust or impurities from entering the interior of the sound-generating device 100, thereby avoiding affecting the acoustic performance of the sound-generating device 100.

[0175] In one embodiment, a first cavity 13 is formed between the second diaphragm 32, the housing 1, and the magnetic circuit system 2, and the sound-generating device 100 is provided with a first leakage hole 111 communicating with the first cavity 13 and the outside. Optionally, the sound-generating device 100 further includes a first venting member that covers the first leakage hole 111.

[0176] It should be noted that, in the first embodiment, as shown in Figures 2 and 7, a first cavity 13 is formed between the second diaphragm 32, the outer shell 1, the magnetic yoke 21 and the support member 24; in the second embodiment, as shown in Figure 9, a first cavity 13 is formed between the second diaphragm 32, the outer shell 1 and the magnetic yoke 21.

[0177] In this embodiment, as shown in Figures 2, 7, and 9, the first cavity 13 can be a sealed cavity. To balance the air pressure within the first cavity 13 and improve the vibration balance of the second diaphragm 32, a first leakage hole 111 connecting the first cavity 13 to the outside is provided on the sound-generating device 100. This allows for air release, adjusting the air pressure within the first cavity 13, balancing the air pressure on both sides of the second diaphragm 32, and improving the vibration stability of the second diaphragm 32.

[0178] Optionally, the first leakage hole 111 includes multiple holes. In this embodiment, the multiple first leakage holes 111 are symmetrically arranged circumferentially around the sound-generating device 100. In this way, the first leakage holes 111 are used to balance the air pressure in the first cavity 13, thereby improving the vibration balance of the second diaphragm 32.

[0179] In this embodiment, by providing a first venting element on the first leakage hole 111 and covering the first leakage hole 111 with the first venting element, on the one hand, external dust or impurities can be prevented from entering the interior of the sound-generating device 100, thereby avoiding affecting the acoustic performance of the sound-generating device 100; on the other hand, the airflow velocity of the first cavity 13 can be further adjusted, the air pressure of the first cavity 13 can be adjusted, the air pressure on both sides of the second diaphragm 32 can be balanced, and the vibration stability of the second diaphragm 32 can be improved.

[0180] In one embodiment, the outer shell 1 includes a first shell 11 and a second shell 12 connected to each other. The end of the first shell 11 away from the second shell 12 is connected to the outer periphery of the first diaphragm 31. The side of the second shell 12 facing away from the first shell 11 is connected to the outer periphery of the second diaphragm 32. The outer periphery of the magnetic yoke 21 is connected to the first shell 11, that is, the outer periphery of the first base plate 212 is connected to the first shell 11.

[0181] Optionally, the first housing 11 is provided with a first leakage hole 111, which penetrates the surface of the first housing 11 facing the second side. The first leakage hole 111 is located on the outside of the first diaphragm 31 and is provided corresponding to a straight edge 313.

[0182] Understandably, this arrangement allows the sound waves from the second diaphragm 32 facing the second side to radiate outward through the first leakage hole 111, and to radiate together with the sound waves from the first diaphragm 31 facing the second side. This achieves the superposition of compressed air when the first diaphragm 31 and the second diaphragm 32 jointly deflate or vibrate towards the second side, thereby increasing the loudness and sensitivity of the sound-generating device 100, reducing assembly difficulty, and increasing the overall compatibility of the assembly. Simultaneously, the straight edge 313 of the first diaphragm 31 is used to avoid the first leakage hole 111, thus ensuring that both the first leakage hole 111 and the first diaphragm 31 are located on the side of the outer casing 1 facing the second side.

[0183] Of course, in other embodiments, the sidewall of the first housing 11 or the second housing 12 is provided with a first leakage hole 111; or, the first leakage hole 111 is formed at the connection between the first housing 11 and the second housing 12, which is not limited here.

[0184] Understandably, by setting a first leakage hole 111 and a first venting element in the first leakage hole 111, the airflow speed and acoustic impedance in the cavity of the sound-generating device 100 can be further adjusted, thereby improving the performance of the sound-generating device 100.

[0185] In one embodiment, a support platform 112 is provided on the inner wall of the first housing 11. The outer periphery of the magnetic yoke 21 and the outer periphery of the first diaphragm 31 are respectively provided on both sides of the support platform 112. The outer contour of the support platform 112 is similar to the outer contour of the first diaphragm 31. A first leakage hole 111 is formed between the inner wall of the first housing 11 and the support platform 112.

[0186] In this embodiment, as shown in Figures 2, 3, 7, 9, and 10, a support platform 112 is provided on the inner wall of the first housing 11 of the outer shell 1, thereby simultaneously fixing the outer periphery of the magnetic yoke 21 and the outer periphery of the first diaphragm 31 using the support platform 112. That is, the outer periphery of the magnetic yoke 21 and the outer periphery of the first diaphragm 31 are respectively located on both sides of the support platform 112.

[0187] Understandably, a first leakage hole 111 is formed between the inner wall of the first housing 11 and the support platform 112. This ensures that the first leakage hole 111 penetrates the surface of the first housing 11 facing the second side, so that both the first leakage hole 111 and the first diaphragm 31 are located on the first side of the sound-generating device 100, thereby simplifying the assembly process and allowing the first diaphragm 31 to avoid the first leakage hole 111 of the first housing 11. Optionally, the outer contour of the support platform 112 is similar to the outer contour of the first diaphragm 31.

[0188] In one embodiment, the side magnetic part 23 includes a side magnet 231 and a side magnetic plate 232 stacked together. The side magnet 231 is connected to the magnetic yoke 21, and the side magnetic plate 232 is connected to the second housing 12. A leakage channel 121 communicating with the first leakage hole 111 is formed between the side magnetic plate 232 and the second housing 12.

[0189] In this embodiment, the side magnetic plate 232 and the second housing 12 can be integrally molded. It is understood that the first housing 11 can be a plastic housing, and the outer periphery of the magnetic yoke 21 is integrally injection molded with the first housing 11, thus simplifying the processing and assembly steps. Of course, in other embodiments, the side magnetic plate 232 and the second housing 12 are bonded together, and the outer periphery of the magnetic yoke 21 and the first housing 11 can also be bonded together. As shown in Figures 2, 7, and 9, the outer periphery of the magnetic yoke 21 is bonded to the support platform 112.

[0190] In one embodiment, as shown in Figures 2, 3, 7, and 9, the sound-generating device 100 further includes a first positioning ring 41, which is disposed between the outer periphery of the first diaphragm 31 and the outer shell 1. Optionally, the first positioning ring 41 can be a steel ring. By using the first positioning ring 41 between the outer periphery of the folded ring portion 311 of the first diaphragm 31 and the outer shell 1, the first diaphragm 31 is easier to handle during assembly, and the assembly accuracy is improved, thereby enhancing the performance of the sound-generating device 100.

[0191] In one embodiment, as shown in Figures 2, 3, 7, and 9, the sound-generating device 100 further includes a second positioning ring 42, which is disposed between the outer periphery of the second diaphragm 32 and the outer shell 1. Optionally, the second positioning ring 42 can be a steel ring. The use of the second positioning ring 42 between the outer periphery of the outer folded ring 323 of the second diaphragm 32 and the outer shell 1 makes it easier to handle the second diaphragm 32 during assembly, while also improving assembly accuracy and enhancing the performance of the sound-generating device 100.

[0192] In one embodiment, the sound-generating device 100 further includes a front cover 6, the periphery of which is connected to the outer shell 1 and located on the side of the first diaphragm 31 facing away from the second diaphragm 32. The outer periphery contour of the front cover 6 is similar to the outer periphery contour of the first diaphragm 31. A second cavity 61 is formed between the first diaphragm 31 and the front cover 6. The front cover 6 is provided with a fourth through hole 62 that connects the second cavity 61 to the outside. The sound waves of the first diaphragm 31 facing the second side are radiated outward through the fourth through hole 62.

[0193] In this embodiment, as shown in Figures 1 to 3, 6, 7, 9, and 17, the front cover 6 serves two purposes: firstly, it protects the first diaphragm 31; secondly, it forms a second cavity 61 between the front cover 6 and the first diaphragm 31, ensuring the amplitude of the first diaphragm 31. It is understood that by providing a fourth through hole 62 connecting the second cavity 61 to the outside in the front cover 6, sound waves from the first diaphragm 31 facing the second side can be radiated outwards through the fourth through hole 62. Optionally, the outer periphery contour of the front cover 6 is similar to the outer periphery contour of the first diaphragm 31.

[0194] Optionally, the front cover 6 is a metal part machined from metal, which facilitates strong support for the sound-generating device 100 during assembly and also reduces its footprint on the overall size of the device. In specific applications, the number of fourth through holes 62 is set according to actual conditions and is not limited to a fixed number. Preferably, the fourth through holes 62 are provided with damping elements or breathable membranes, which can further adjust the airflow velocity of the second cavity 61 and adjust the acoustic impedance of the second cavity 61.

[0195] In one embodiment, as shown in Figures 2, 6, 7, and 10, the outer casing 1 is further provided with a support boss 113 and a baffle 114 connected to the support boss 113 at one end facing away from the second diaphragm 32. The front cover 6 includes a top cover portion 63, a side plate portion 64 provided around the top cover portion 63, and an edge portion 65 extending outward from one end of the side plate portion 64 away from the top cover portion 63. The edge portion 65 is supported by the support boss 113. The surface of the baffle 114 facing the second side protrudes from the surface of the edge portion 65 facing the second side. The top cover portion 63 is provided with a fourth through hole 62.

[0196] Understandably, by providing a support boss 113 and a retaining wall 114 on the outer shell 1, the front cover 6 is supported and fixed by the support boss 113 and the retaining wall 114, and the front cover 6 is positioned and installed. Optionally, the top cover portion 63, the side plate portion 64, and the edge portion 65 of the front cover 6 are integrally formed structures. The front cover 6 is connected to the outer shell 1 through the edge portion 65, and the top cover portion 63 is supported by the side plate portion 64, thereby forming a second cavity 61 between the first diaphragm 31 and the front cover 6.

[0197] In another embodiment, as shown in Figures 9 and 17, the front cover 6 includes a top cover portion 63, a side plate portion 64 disposed around the periphery of the top cover portion 63, an edge portion 65 extending outward from one end of the side plate portion 64 away from the top cover portion 63, and a bent portion 66 formed by bending and extending the edge portion 65. The bent portion 66 is connected to the outer shell 1, and the bent portion 66 and the edge portion 65 form a limiting space 67 with the outer shell 1. The periphery of the first diaphragm 31 is limited within the limiting space 67, and the top cover portion 63 is provided with a fourth through hole 62.

[0198] In this embodiment, the front cover 6 is configured as an integrally formed top cover 63, side plate 64, edge 65, and bending portion 66, so that the bending portion 66 of the front cover 6 is connected to the outer shell 1, thereby forming a limiting space 67 between the bending portion 66 and the edge 65 and the outer shell 1. In this way, the limiting space 67 can be used to accommodate and limit the periphery of the first diaphragm 31, thereby increasing the effective vibration area of ​​the first diaphragm 31 and simultaneously increasing the volume of the second cavity 61, thus improving the acoustic performance of the first diaphragm 31.

[0199] As shown in Figures 18 to 20, the present invention also proposes an electronic device 800, which includes the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0200] In one embodiment, the electronic device 800 further includes a device housing 700, which has a receiving cavity 710. The sound-generating device 100 is disposed in the receiving cavity 710 and the receiving cavity 710 is divided into a front cavity 740 and a rear cavity 750 that are isolated from each other. The first side of the sound-generating device 100 is connected to the front cavity 740. The device housing 700 has a sound outlet 720 that is connected to the front cavity 740. The sound waves of the first diaphragm 31 and the second diaphragm 32 of the sound-generating device 100 facing the first side are radiated to the outside through the front cavity 740 and the sound outlet 720.

[0201] In this embodiment, the device housing 700 can be a metal housing or a plastic housing, and there is no limitation on this. The device housing 700 can be a one-piece molded structure or a split structure, and there is no limitation on this. Optionally, the device housing 700 includes an upper shell and a lower shell, which can be bonded or welded together to enclose and form a receiving cavity 710.

[0202] Optionally, the outer contour of the device housing 700 can be a square structure. In specific applications, other suitable shapes such as circles can be selected according to the actual situation, and it is not limited to a specific shape.

[0203] Understandably, a sound outlet 720 communicating with the front cavity 740 is provided on the upper shell of the device housing 700, so that the sound waves from the first side of the first diaphragm 31 and the second diaphragm 32 of the sound-generating device 100 are radiated to the outside through the front cavity 740 and the sound outlet 720.

[0204] In this embodiment, the second side of the sound-generating device 100 is connected to the rear cavity 750, and the first cavity 13 of the sound-generating device 100 is connected to the rear cavity 750 through the first leakage hole 111. Sound waves from the first diaphragm 31 and the second diaphragm 32 of the sound-generating device 100 facing the second side radiate into the rear cavity 750. It can be understood that the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction, and the sound waves from the first diaphragm 31 and the second diaphragm 32 facing the second side have opposite phases to the sound waves facing the first side.

[0205] In one embodiment, the device housing 700 is further provided with a second leakage hole 730, which is connected to the rear cavity 750; wherein, the first diaphragm 31 and the second diaphragm 32 of the sound-generating device 100 radiate sound waves to the rear cavity 750 that are opposite in phase to the sound waves of the front cavity 740, and the sound waves of the rear cavity 750 are radiated to the outside through the second leakage hole 730.

[0206] As can be understood, as shown in Figures 18 to 20, a second leakage hole 730 is provided on the lower shell of the device housing 700. The second leakage hole 730 communicates with the rear cavity 750. The first diaphragm 31 and the second diaphragm 32 radiate sound waves with opposite phases to the sound waves in the front cavity 740 into the rear cavity 750. The sound waves in the rear cavity 750 are radiated to the outside through the second leakage hole 730. Optionally, a damping element for adjusting acoustic impedance is provided on the second leakage hole 730.

[0207] In this embodiment, a second leakage hole 730 is provided on the lower shell of the device housing 700. The second leakage hole 730 communicates with the rear cavity 750 and is used to adjust the pressure inside the rear cavity 750, further adjusting the air pressure of the first cavity 13. At the same time, the sound waves from the rear cavity 750 radiate to the outside through the second leakage hole 730. The sound waves from the rear cavity 750 are out of phase with the sound waves from the front cavity 740, which can act as an acoustic dipole, achieving the technical effects of far-field noise reduction and protecting user privacy.

[0208] In this embodiment, the second leakage hole 730 can be selected as a circular hole, an elliptical hole, or a polygonal hole, etc., and is not limited thereto. The number of the second leakage holes 730 can be one or more, depending on the actual application design, and is not limited thereto.

[0209] In this embodiment, the upper shell includes a top wall and a first side wall, and the lower shell includes a bottom wall and a second side wall. The first and second side walls together form the side walls of the housing of the electronic device 800. That is, the device housing 700 includes a top wall and a bottom wall disposed opposite to each other, and a side wall connecting the top wall and the bottom wall. Optionally, the sound outlet 720 is located in the connection area between the top wall and the side wall, and the second leakage outlet 730 is located in the connection area between the side wall and the bottom wall. In this way, the sound output performance of the electronic device 800 and the technical effect of protecting privacy can be taken into account. The most suitable design scheme can be selected according to actual needs during use, and this application does not limit it.

[0210] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: shell; A magnetic circuit system connected to the outer casing includes a central magnetic part, a side magnetic part, and a magnetically conductive yoke connecting the central magnetic part and the side magnetic part. A first magnetic gap is formed between the central magnetic part and the magnetically conductive yoke, and a second magnetic gap is formed between the side magnetic part and the magnetically conductive yoke. The second magnetic gap surrounds the first magnetic gap. The magnetic circuit system also includes a through hole that sequentially passes through the central magnetic part and the magnetically conductive yoke, and the first magnetic gap surrounds the through hole. A vibration system comprising a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil, wherein the first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system, the outer periphery of the first diaphragm is connected to the outer shell and is opposite to and spaced from the magnetic circuit system, the outer periphery of the second diaphragm is connected to the outer shell, the inner periphery of the second diaphragm is connected to the magnetic circuit system, and the inner periphery of the second diaphragm is provided with a third through hole communicating with the through hole, one end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap; The outer periphery of the first diaphragm includes at least one straight edge and at least one arc-shaped edge, the straight edge being connected to the arc-shaped edge. The sound-generating device has a first side of the second diaphragm facing away from the first diaphragm and a second side of the first diaphragm facing away from the second diaphragm. Sound waves from the first diaphragm facing the first side radiate outward through the through hole and the third through hole, and together with the sound waves from the second diaphragm facing the first side, radiate towards the first side.

2. The sound-generating device as described in claim 1, characterized in that, The outer periphery of the first diaphragm includes a straight edge and an arc-shaped edge, the straight edge and the arc-shaped edge being connected, and the first diaphragm being symmetrically arranged along the center line of the straight edge; or, the outer periphery of the first diaphragm includes two straight edges and two arc-shaped edges, the two ends of each straight edge being connected to one end of each of the two arc-shaped edges, and the two ends of each arc-shaped edge being connected to one end of each of the two straight edges; wherein, the two straight edges are symmetrically arranged, and the two arc-shaped edges are symmetrically arranged. And / or, the end face of the housing connected to the first diaphragm includes at least one straight edge and at least one arc-shaped portion, the straight edge being connected to the straight edge and the arc-shaped edge being connected to the arc-shaped portion.

3. The sound-generating device as described in claim 1, characterized in that, The first diaphragm includes a surround portion and a dome, the surround portion is disposed around the dome, the outer edge of the surround portion is connected to the housing, and the first voice coil is connected to the dome; wherein, the outer contour of the dome is similar to the outer contour of the surround portion; And / or, the second diaphragm includes an inner folded ring, a vibrating part and an outer folded ring connected in sequence, the inner periphery of the inner folded ring is connected to the magnetic circuit system and is provided with the third through hole, the outer side of the outer folded ring is connected to the outer shell, and the second voice coil is connected to the vibrating part; wherein, the second diaphragm also includes a vibrating plate, the vibrating plate being disposed between the vibrating part and the second voice coil.

4. The sound-generating device as described in claim 1, characterized in that, The magnetic yoke includes a first base plate, a first side plate, and a first top plate. The first top plate and the first base plate are connected to the two ends of the first side plate along the vibration direction of the vibration system. The periphery of the first base plate is connected to the outer shell. The central magnetic part is disposed on the first top plate and is spaced apart from the first side plate to form the first magnetic gap. The edge magnetic part is disposed on the first base plate and is spaced apart from the first side plate to form the second magnetic gap. The through hole sequentially penetrates the central magnetic part and the first top plate. The magnetic yoke further includes a support plate formed by bending and extending the inner periphery of the first top plate adjacent to the through hole in a direction away from the central magnetic part, and the inner periphery of the second diaphragm is connected to the end of the support plate away from the first top plate.

5. The sound-generating device as described in claim 1, characterized in that, The magnetic yoke includes a first top plate, a first bottom plate, and a first side plate connecting the first top plate and the first bottom plate. The first bottom plate is connected to the outer shell. The central magnetic part is disposed on the first top plate and spaced apart from the first side plate to form the first magnetic gap. The side magnetic part is disposed on the first bottom plate and spaced apart from the first side plate to form the second magnetic gap. The magnetic circuit system further includes a support member, which is located on the side of the first top plate facing away from the central magnetic part and forms an airflow cavity with the first top plate. The through hole passes through the central magnetic part and the first top plate in sequence and communicates with the airflow cavity. The support member has a second through hole that connects the airflow cavity and the third through hole. The inner periphery of the second diaphragm is connected to the support member. The first top plate also has a first through hole that connects the first magnetic gap and the airflow cavity.

6. The sound-generating device as described in claim 5, characterized in that, The support includes a second top plate, a second side plate disposed around the periphery of the second top plate, and a second bottom plate extending outward from the end of the second side plate away from the second top plate. The second bottom plate is connected to the side of the first top plate opposite to the central magnet, so that the second top plate, the second side plate, and the first top plate enclose the airflow cavity. The second top plate is provided with a second through hole. The inner periphery of the first diaphragm is connected to the side of the second top plate opposite to the airflow cavity, so that the third through hole communicates with the second through hole. Wherein, there is one second through hole, and the second through hole is connected to the third through hole; or, there are multiple second through holes, and the multiple second through holes are spaced apart; and / or, the area of ​​the second top plate is defined as S3, and the opening area of ​​the second through hole is defined as S4, S4 = (10%~80%)S3; and / or, the support member is a metal part, and the second bottom plate is bonded or welded to the magnetic yoke; or, the support member is an injection molded part, and the support member and the magnetic yoke are integrally injection molded.

7. The sound-generating device as claimed in claim 1, characterized in that, A first cavity is formed between the second diaphragm, the outer shell, and the magnetic circuit system, and the outer shell is provided with a first leakage hole that connects the first cavity to the outside; The sound waves from the second diaphragm facing the second side radiate outward through the first leakage hole, and together with the sound waves from the first diaphragm facing the second side radiate towards the second side.

8. The sound-generating device as claimed in claim 7, characterized in that, The outer shell includes a first shell and a second shell connected to each other. The end of the first shell away from the second shell is connected to the outer periphery of the first diaphragm. The side of the second shell opposite to the first shell is connected to the outer periphery of the second diaphragm. The outer periphery of the magnetic yoke is connected to the first shell. Wherein, the first housing is provided with the first leakage hole, the first leakage hole penetrates the surface of the first housing facing the second side, the first leakage hole is located on the outside of the first diaphragm and is provided corresponding to a straight edge; or, the first leakage hole is provided on the side wall of the first housing or the second housing; or, the first leakage hole is formed at the connection between the first housing and the second housing.

9. The sound-generating device as described in claim 8, characterized in that, The inner wall of the first housing is provided with a support platform. The outer periphery of the magnetic yoke and the outer periphery of the first diaphragm are respectively located on both sides of the support platform. The outer contour of the support platform is similar to the outer contour of the first diaphragm. The first leakage hole is formed between the inner wall of the first housing and the support platform. And / or, the edge magnetic part includes an edge magnet and an edge magnetic plate stacked together, the edge magnet is connected to the magnetic yoke, the edge magnetic plate is connected to the second housing, and a leakage channel communicating with the first leakage hole is formed between the edge magnetic plate and the second housing; wherein, the edge magnetic plate and the second housing are integrally formed; or, the edge magnetic plate and the second housing are bonded together. And / or, the first housing is provided with a first conductive element, one end of which is electrically connected to the lead of the first voice coil; the second housing is provided with a second conductive element, one end of which is electrically connected to the lead of the second voice coil; and the other end of the first conductive element is connected to the other end of the second conductive element for connection to an external circuit. And / or, the first housing is a plastic housing, and the outer periphery of the magnetic yoke is integrally injection molded with the first housing; or, the outer periphery of the magnetic yoke is bonded to the first housing; And / or, the sound-generating device further includes a first ventilator that covers the first leakage hole.

10. The sound-generating device as claimed in claim 1, characterized in that, The sound-generating device further includes a front cover, the periphery of which is connected to the outer shell and located on the side of the first diaphragm facing away from the second diaphragm. The outer periphery contour of the front cover is similar to the outer periphery contour of the first diaphragm. A second cavity is formed between the first diaphragm and the front cover. The front cover is provided with a fourth through hole that connects the second cavity to the outside. The sound waves from the first diaphragm facing the second side radiate outward through the fourth through hole.

11. The sound-generating device as claimed in claim 10, characterized in that, The outer casing is provided with a support boss and a baffle connected to the support boss at one end facing away from the second diaphragm. The front cover includes a top cover, a side plate provided around the top cover, and an edge extending outward from one end of the side plate away from the top cover. The edge is supported by the support boss. The surface of the baffle facing the second side protrudes from the surface of the edge facing the second side. The top cover is provided with the fourth through hole. Alternatively, the front cover includes a top cover portion, a side plate portion disposed around the periphery of the top cover portion, an edge portion extending outward from one end of the side plate portion away from the top cover portion, and a bent portion formed by bending and extending the edge portion. The bent portion is connected to the outer shell, and the bent portion and the edge portion form a limiting space with the outer shell. The periphery of the first diaphragm is limited within the limiting space, and the top cover portion is provided with the fourth through hole.

12. The sound-generating device according to any one of claims 1 to 11, characterized in that, The first diaphragm and the second diaphragm vibrate in the same direction, radiating a first sound wave to the external environment from the first side and a second sound wave to the external environment from the second side, with the first and second sound waves having opposite phases; or, the sound-generating device is applied to an electronic device and is used to divide the space of the electronic device into an acoustically isolated front cavity and a rear cavity, the first side being connected to the front cavity and the second side being connected to the rear cavity, the first diaphragm and the second diaphragm vibrating in the same direction and radiating a first sound wave to the front cavity and a second sound wave to the rear cavity, with the first and second sound waves having opposite phases; And / or, the second diaphragm is annular, the inner edge of the second diaphragm forms the third through hole, and the sound-generating device further includes a second venting member, the second venting member being connected to the inner edge of the second diaphragm and covering the third through hole; And / or, the sound-generating device further includes a first positioning ring, which is disposed between the outer periphery of the first diaphragm and the outer shell; And / or, the sound-generating device further includes a second positioning ring, which is disposed between the outer periphery of the second diaphragm and the outer shell.

13. An electronic device, characterized in that, The electronic device includes: Equipment housing, the equipment housing having a receiving cavity; and The sound-generating device as described in any one of claims 1 to 12 is disposed within the receiving cavity and divides the receiving cavity into a mutually isolated front cavity and a rear cavity, wherein a first side of the sound-generating device communicates with the front cavity; The device housing is provided with a sound outlet hole that connects to the front cavity. Sound waves from the first and second diaphragms of the sound-generating device facing the first side are radiated to the outside through the front cavity and the sound outlet hole.

14. The electronic device as claimed in claim 13, characterized in that, The device housing is also provided with a second leakage hole, which communicates with the rear cavity; The first and second diaphragms of the sound-generating device radiate sound waves with phase opposite to the sound waves in the front cavity into the rear cavity, and the sound waves in the rear cavity radiate to the outside through the second leakage hole.

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