Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a central magnetic part and an edge magnetic part of a magnetic circuit system of the sound production device respectively form a first magnetic gap and a second magnetic gap with a magnetic conductive yoke, and the second magnetic gap is arranged around the first magnetic gap; the magnetic circuit system is further provided with a through hole sequentially penetrating through the center magnetic part and the magnetic conductive yoke, the first magnetic gap surrounds the through hole, the first vibrating diaphragm and the second vibrating diaphragm are located on the two opposite sides of the magnetic circuit system, the inner periphery of the second vibrating diaphragm is connected with the magnetic circuit system, and the inner periphery of the first vibrating diaphragm is provided with a third through hole communicated with the through hole. The first voice coil and the second voice coil are respectively suspended in the first magnetic gap and the second magnetic gap, the outer periphery of the first vibrating diaphragm comprises at least one straight edge and at least one arc-shaped edge, and the straight edge is connected with the arc-shaped edge. According to the sound production device, the irregular space of the whole machine can be utilized to the maximum extent, the vibration area of the vibration system is increased, and therefore the performance and effect of the whole machine are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducers, and particularly to a sound generating device and an electronic device applying the sound generating device. Background Art

[0002] In recent years, with the development of intelligent wearable electronic products, the requirements for the performance of individual components of intelligent wearable products have become increasingly high. In particular, the requirements for OWS (Open Wearable Stereo, which means fully open wearable headphones) Bluetooth headsets are different from those of TWS (True Wireless Stereo, which means true wireless stereo). Because the whole machine is designed to be worn conveniently and comfortably without inserting into the ears, it is extremely urgent to improve the performance of the sound generating element.

[0003] Traditional Driver designs all generate sound through single-sided vibration. In the limited cavity of the whole machine, it is very difficult to increase the vibration area and vibration displacement. Moreover, the existing speaker has a relatively regular shape design. In the case of irregular reserved space in the whole machine, the accommodation space of the electronic device cannot be maximally utilized, and the Sd of the diaphragm cannot be maximized either, which brings huge losses to the performance of the speaker. To solve the above problems, how to design a speaker to maximize the use of the irregular space of the electronic device and improve its own performance is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The main purpose of the present invention is to provide a sound generating device and an electronic device, aiming to provide a sound generating device with an increased effective vibration area. The sound generating device not only maximally utilizes the irregular space of the whole machine, but also increases the effective vibration area, realizes the effective superposition of double-sided sound generation, reduces the assembly difficulty, and improves the performance and effect of the whole machine.

[0005] To achieve the above purpose, the present invention proposes a sound generating device, which includes:

[0006] A housing;

[0007] A magnetic circuit system, the magnetic circuit system is connected to the housing. The magnetic circuit system includes a central magnetic part, a peripheral magnetic part, and a magnetic yoke connecting the central magnetic part and the peripheral magnetic part. A first magnetic gap is formed between the central magnetic part and the magnetic yoke, and a second magnetic gap is formed between the peripheral magnetic part and the magnetic yoke. The second magnetic gap surrounds the first magnetic gap. The magnetic circuit system is also provided with a through hole sequentially penetrating the central magnetic part and the magnetic yoke, and the first magnetic gap surrounds the through hole; and

[0008] A vibration system, the vibration system includes a first diaphragm, a second diaphragm, a first voice coil and a second voice coil. 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 housing and is opposite to and spaced from the magnetic circuit system. The outer periphery of the second diaphragm is connected to the housing, and the inner periphery of the second diaphragm is connected to the magnetic circuit system. A third through hole communicating with the through hole is provided at the inner periphery of the second diaphragm. 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] Wherein, the outer periphery of the first diaphragm includes at least one straight edge and at least one arc edge, the straight edge is connected to the arc 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. The sound wave of the first diaphragm facing the first side is radiated outward through the through hole and the third through hole, and jointly radiates to the first side with the sound wave of the second diaphragm facing the first side.

[0010] In an embodiment, the outer periphery of the first diaphragm includes one straight edge and one arc edge, the straight edge is connected to the arc edge, and the first diaphragm is 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 edges, and each end of each straight edge is respectively connected to one end of two arc edges, and each end of each arc edge is respectively connected to one end of two straight edges; wherein, the two straight edges are symmetrically arranged, and the two arc edges are symmetrically arranged;

[0011] And / or, the end face of the housing connected to the first diaphragm includes at least one straight edge part and at least one arc part, the straight edge is correspondingly connected to the straight edge part, and the arc edge is correspondingly connected to the arc part.

[0012] In an embodiment, the first diaphragm includes a surround part and a dome, the surround part surrounds the dome, the outer edge of the surround part 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 part;

[0013] And / or, the second diaphragm includes an inner surround, a vibrating part and an outer surround connected in sequence. The inner periphery of the inner surround is connected to the magnetic circuit system and is provided with the third through hole. The outer side of the outer surround is connected to the housing, and the second voice coil is connected to the vibrating part; wherein, the second diaphragm further includes a vibrating plate, and the vibrating plate is arranged between the vibrating part and the second voice coil.

[0014] In one embodiment, the magnetic yoke includes a first bottom plate, a first side plate, and a first top plate. The first top plate and the first bottom plate are connected to two ends of the first side plate along the vibration direction of the vibration system. The periphery of the first bottom plate is connected to the housing. The central magnetic part is arranged on the first top plate and is spaced from the first side plate to enclose the first magnetic gap. The edge magnetic part is arranged on the first bottom plate and is spaced from the first side plate to enclose the second magnetic gap. The through hole sequentially penetrates through the central magnetic part and the first top plate;

[0015] Wherein, 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. The inner periphery of the second diaphragm is connected to one 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 housing. The central magnetic part is arranged on the first top plate and is spaced from the first side plate to form the first magnetic gap. The edge magnetic part is arranged on the first bottom plate and is spaced from the first side plate to form the second magnetic gap;

[0017] Wherein, the magnetic circuit system further includes a support member. The support member is arranged on a side of the first top plate facing away from the central magnetic part and encloses an air flow cavity with the first top plate. The through hole sequentially penetrates through the central magnetic part and the first top plate and is communicated with the air flow cavity. The support member is provided with a second through hole communicating the air flow cavity and the third through hole. The inner periphery of the second diaphragm is connected to the support member. The first top plate is further provided with a first through hole communicating the first magnetic gap and the air flow cavity.

[0018] In one embodiment, the support member includes a second top plate, a second side plate arranged on the periphery of the second top plate, and a second bottom plate formed by extending the end of the second side plate away from the second top plate towards the outside. The second bottom plate is connected to a side of the first top plate facing away from the central magnetic part, so that the second top plate, the second side plate, and the first top plate enclose the air flow cavity. The second top plate is provided with the second through hole. The inner periphery of the first diaphragm is connected to a side of the second top plate facing away from the air flow cavity, so that the third through hole is communicated with the second through hole;

[0019] Wherein, there is one second through-hole, and the second through-hole is correspondingly communicated with the third through-hole; or, there are multiple second through-holes, and the multiple second through-holes are arranged at intervals; and / or, define the area of the second top plate as S3, define the opening area of the second through-hole as S4, and S4 = (10% - 80%)S3; and / or, the support member is a metal member, and the second bottom plate is adhesively connected 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 an embodiment, a first cavity is formed among the second diaphragm, the housing and the magnetic circuit system, and the housing is provided with a first leakage hole communicating the first cavity with the outside.

[0021] Wherein, the sound wave on the second side of the second diaphragm is radiated outwards through the first leakage hole, and jointly radiates towards the second side with the sound wave on the second side of the first diaphragm.

[0022] In an embodiment, the housing includes a first housing body and a second housing body connected to each other. One end of the first housing body away from the second housing body is connected to the outer periphery of the first diaphragm, one side of the second housing body facing away from the first housing body is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the first housing body.

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

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

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

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

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

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

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

[0030] Wherein, the sound wave of the first diaphragm facing the second side is radiated outward through the fourth through hole.

[0031] In an embodiment, a support boss and a retaining wall connected to the support boss are further provided at one end of the housing facing away from the second diaphragm. The front cover includes a top cover portion, a side plate portion provided at the periphery of the top cover portion, and an edge portion extending outward from one end of the side plate portion away from the top cover portion. The edge portion is supported on the support boss, and the surface of the retaining wall facing the second side protrudes from the surface of the edge portion facing the second side. The top cover portion is provided with the fourth through hole;

[0032] Or, the front cover includes a top cover portion, a side plate portion provided at 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 housing, and a limiting space is formed between the bent portion and the edge portion and the housing. The periphery of the first diaphragm is limited in 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. The first diaphragm and the second diaphragm radiate a first sound wave towards the external environment on the first side, and the first diaphragm and the second diaphragm radiate a second sound wave towards the external environment on the second side. The first sound wave and the second sound wave are out of phase; alternatively, the sound generating device is applied to an electronic device and is configured to divide the space of the electronic device into an acoustically isolated front cavity and a rear cavity. The first side communicates with the front cavity, the second side communicates with the rear cavity. The first diaphragm and the second diaphragm vibrate in the same direction, radiate a first sound wave towards the front cavity, and radiate a second sound wave towards the rear cavity. The first sound wave and the second sound wave are out of phase;

[0034] And / or, the second diaphragm is annular, and the inner edge of the second diaphragm forms the third through hole. The sound generating device further includes a second air-permeable member, and the second air-permeable member is connected to the inner edge of the second diaphragm and covers the third through hole;

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

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

[0037] The present invention also provides an electronic device, which includes:

[0038] A device housing, the device housing is provided with a receiving cavity; and

[0039] The above-mentioned sound generating device, the sound generating device is disposed in the receiving cavity and divides the receiving cavity into a mutually isolated front cavity and a rear cavity. The first side of the sound generating device communicates with the front cavity;

[0040] Wherein, the device housing is provided with a sound outlet hole communicating with the front cavity, and the sound waves of the first diaphragm and the second diaphragm 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, and the second leakage hole communicates with the rear cavity;

[0042] Wherein, the first diaphragm and the second diaphragm of the sound generating device radiate sound waves out of phase with the sound waves in the front cavity towards the rear cavity, and the sound waves in the rear cavity are radiated to the outside through the second leakage hole.

[0043] The sound generating device of the technical solution of the present invention houses a magnetic circuit system and a vibration system in a housing, and the magnetic circuit system is set as a central magnetic part, an edge magnetic part, and a magnetic yoke connecting the central magnetic part and the edge magnetic part, so that a first magnetic gap is formed between the central magnetic part and the magnetic yoke, and a second magnetic gap is formed between the edge magnetic part and the magnetic yoke. The second magnetic gap is arranged around the first magnetic gap. The vibration system is set as a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil, so that the first diaphragm and the second diaphragm are respectively arranged on opposite sides of the magnetic circuit system and connected to the housing. 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. Thus, when currents are passed through the first voice coil and the second voice coil, the first voice coil and the second voice coil respectively convert electrical energy into mechanical energy in the first magnetic gap and the second magnetic gap formed by the magnetic circuit system, so as to drive the first voice coil and the second voice coil to drive the first diaphragm and the second diaphragm to vibrate respectively. It not only realizes sound generation by driving two voice coils to drive two diaphragms to vibrate through one magnetic circuit system, but also realizes the same-direction vibration of the double-sided diaphragms without increasing the external dimensions, and increases the vibration area of the vibration system, thereby achieving the purpose of performance improvement. At the same time, by providing a through hole that sequentially penetrates the central magnetic part and the magnetic yoke in the magnetic circuit system, the first magnetic gap is arranged around the through hole, and the inner peripheral edge of the second diaphragm is connected to the magnetic circuit system, and a third through hole communicating with the through hole is provided at the inner peripheral edge of the second diaphragm. Thus, the sound waves on the first side of the first diaphragm are radiated outward through the through hole and the third through hole, and jointly radiate to the first side with the sound waves on the first side of the second diaphragm, which is beneficial to the superposition of the compressed air when the first diaphragm and the second diaphragm vibrate together toward the first side, and improves the loudness and sensitivity of the sound generating device. Further, by setting the outer peripheral edge of the first diaphragm to include at least one straight edge and at least one arc edge, and the straight edge is connected to the arc edge, the outer contour of the first diaphragm presents a non-circular structure, so that the sound generating device can be applied to the irregular space reserved for the whole machine to maximize the utilization of the irregular space, and the effective vibration area (Sd) of the first diaphragm is maximized. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

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

[0046] Figure 2Schematic cross-sectional view of an embodiment of the sound generating device provided by the present invention;

[0047] Figure 3 Exploded schematic view of an embodiment of the sound generating device provided by the present invention;

[0048] Figure 4 Top view structural schematic diagram of the sound generating device provided by the present invention in an embodiment with the front cover removed;

[0049] Figure 5 Structural schematic diagram of another embodiment of the sound generating device provided by the present invention;

[0050] Figure 6 Structural schematic diagram of another perspective of another embodiment of the sound generating device provided by the present invention;

[0051] Figure 7 Schematic cross-sectional view of another embodiment of the sound generating device provided by the present invention;

[0052] Figure 8 Top view structural schematic diagram of the sound generating device provided by the present invention in another embodiment with the front cover removed;

[0053] Figure 9 Partial cross-sectional schematic view of yet another embodiment of the sound generating device provided by the present invention;

[0054] Figure 10 Exploded schematic view of the housing in an embodiment of the sound generating device provided by the present invention;

[0055] Figure 11 Structural schematic diagram of the magnetic yoke in an embodiment of the sound generating device provided by the present invention;

[0056] Figure 12 Schematic cross-sectional view of the magnetic yoke in an embodiment of the sound generating device provided by the present invention;

[0057] Figure 13 Schematic cross-sectional view of the magnetic yoke in another embodiment of the sound generating device provided by the present invention;

[0058] Figure 14 Structural schematic diagram of the support member in an embodiment of the sound generating device provided by the present invention;

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

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

[0061] Figure 17 Structural schematic diagram of the front cover in an embodiment of the sound generating device provided by the present invention;

[0062] Figure 18 Schematic structural diagram of an embodiment of the electronic device provided by the present invention;

[0063] Figure 19 Schematic cross-sectional view of an embodiment of the electronic device provided by the present invention

[0064] Figure 20 Schematic cross-sectional view of another embodiment of the electronic device provided by the present invention.

[0065] Explanation of the reference numerals in the drawings:

[0066] 100, sound generating device; 1, housing; 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, protruding part; 2112, support part; 2113, inclined surface; 2114, first through hole; 2115, air flow channel; 212, first bottom plate; 2121, avoidance 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, air flow cavity; 242, second top plate; 2421, second through hole; 243, second side plate; 244, second bottom plate; 25, first magnetic gap; 26, second magnetic gap; 27, through hole; 3, vibration system; 31, first diaphragm; 311, folding ring part; 312, dome; 313, straight edge; 314, arc edge; 32, second diaphragm; 321, inner folding ring; 322, vibrating part; 323, outer folding ring; 324, third through hole; 325, vibrating plate; 33, first voice coil; 34, second voice coil; 41, first positioning ring; 42, second positioning ring; 6, front cover; 61, second cavity; 62, fourth through hole; 63, top cover part; 64, side plate part; 65, edge part; 66, bending part; 67, limiting space; 700, device housing; 710, receiving cavity; 720, sound outlet hole; 730, second leakage hole; 740, front cavity; 750, rear cavity; 800, electronic device.

[0067] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0068] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0069] 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 conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0070] At the same time, the meaning of "and / or" or "and / or" that appears throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes the solution of A, or the solution of B, or the solution where A and B are satisfied simultaneously.

[0071] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0072] In recent years, with the rapid development of consumer electronic products, electronic devices such as headphones, smart phones, and VR devices have been recognized by consumers and widely used. Those skilled in the art have also correspondingly improved related supporting products such as headphones to meet the performance requirements of electronic products and the needs of consumers for product performance.

[0073] The sound generating device is an important electroacoustic transducer component in consumer electronic products and is widely used as a speaker, earphone, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound generating device is also an inevitable trend. In particular, the requirements of OWS (Open Wearable Stereo, full open wearable headphones) Bluetooth headphones are different from those of TWS (True Wireless Stereo, true wireless stereo). Because the whole machine is designed to be convenient and comfortable to wear, it adopts a non-in-ear way, so the improvement of the performance of the sound generating device is extremely urgent.

[0074] Traditional Driver designs all feature single-sided vibration for sound production. In the cavity of a complete machine with limited internal space, it is difficult to increase the vibration area and vibration displacement, so the room for improving the performance of the sound-producing device is relatively limited, unable to meet the requirements of existing wearable audio products such as OWS. At the same time, to improve the performance of the sound-producing device, the product design is becoming more and more extreme and the space utilization rate is getting higher and higher, resulting in risks to the reliability of the product and being unfavorable to the improvement of high-frequency performance, thus leading to poor overall performance and effects of the complete machine.

[0075] Moreover, the external shape of existing speakers is designed relatively regularly. In the case of irregular reserved space for the complete machine, the accommodation space of the electronic device cannot be maximally utilized, nor can the Sd of the diaphragm be maximized, which brings huge losses to the performance of the speaker. To address the above problems, how to design a speaker to maximize the use of the irregular space of the electronic device and improve its own performance is a technical problem that urgently needs to be solved currently.

[0076] Based on the above concepts and problems, the present invention proposes a sound-producing device 100. It can be understood that the sound-producing device 100 is applied to an electronic device, which can be a mobile phone, earphone, smart wearable device, etc., and is not limited herein.

[0077] In this embodiment, the sound-producing device 100 of the present invention realizes sound production by setting a double diaphragm and a double voice coil structure, using one magnetic circuit system 2 to drive two voice coils to drive two diaphragms to vibrate. At the same time, it realizes double-sided diaphragm sound production without increasing the external dimensions, increasing the vibration area of the vibration system 3, thereby achieving the purpose of performance improvement. And the double-sided diaphragms radiate sound waves on the same side of the sound-producing device 100, which is conducive to improving the loudness and sensitivity of the sound-producing device 100.

[0078] Please refer to Figures 1 to 17As shown in the figure, in the embodiment of the present 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, an edge magnetic part 23, and a magnetic yoke 21 connecting the central magnetic part 22 and the edge magnetic part 23. A first magnetic gap 25 is formed between the central magnetic part 22 and the magnetic yoke 21, and a second magnetic gap 26 is formed between the edge magnetic part 23 and the magnetic yoke 21. The second magnetic gap 26 is arranged around the first magnetic gap 25. The magnetic circuit system 2 is further provided with a through hole 27 penetrating through the central magnetic part 22 and the magnetic yoke 21 in sequence, and the first magnetic gap 25 is arranged around 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 peripheral edge of the first diaphragm 31 is connected to the housing 1 and is opposite to and spaced from the magnetic circuit system 2. The outer peripheral edge of the second diaphragm 32 is connected to the housing 1, the inner peripheral edge of the second diaphragm 32 is connected to the magnetic circuit system, and a third through hole 324 communicating with the through hole 27 is provided on the inner peripheral edge of the second diaphragm 32. 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; wherein, the outer peripheral edge of the first diaphragm 31 includes at least one straight edge 313 and at least one arc edge 314, and the straight edge 313 is connected to the arc 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 are radiated outward through the through hole 27 and the third through hole 324, and jointly radiate to the first side with the sound waves of the second diaphragm 32 facing the first side.

[0079] In this embodiment, the sound generating device 100 can be a sound generating unit of a speaker, and the speaker can be a micro speaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100 are arranged relatively.

[0080] It can be understood that the housing 1 is used to install, fix, and support components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides an installation basis for components such as the magnetic circuit system 2 and the vibration system 3. Optionally, the housing 1 can be an integral structure or can be formed by the cooperation of multiple split structures, which is not limited herein.

[0081] In this embodiment, the housing 1 can be selected as a box or a frame structure, that is, the housing 1 has a cavity with openings at both ends. The magnetic circuit system 2 is housed in the cavity of the housing 1 and is connected to the housing 1. The first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are respectively arranged on opposite sides of the magnetic circuit system 2, and the outer peripheral edges of the first diaphragm 31 and the second diaphragm 32 are respectively connected to both ends of the housing 1. In this way, a double-diaphragm structure is formed, so that one magnetic circuit system 2 is used to drive two voice coils of the vibration system 3 to drive the two diaphragms to vibrate to generate sound. At the same time, without increasing the external dimensions, the double-sided diaphragms can generate sound in the same direction, and the vibration area of the vibration system 3 is increased, so as to achieve the purpose of performance improvement.

[0082] In this embodiment, the housing 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. In this way, it is convenient for the sound generating device 100 to connect and conduct the first voice coil 33 and the second voice coil 34 to an external circuit through the conductive terminals.

[0083] It should be noted that the sound generating device 100 has a first side and a second side facing away from each other. The first side and the second side can be understood in terms of orientation or direction. In this embodiment, as Figures 1 to 3 , Figures 5 to 7 , Figure 8 shown, the sound generating device 100 has a first side where the second diaphragm 32 faces away from the first diaphragm 31 and a second side where the first diaphragm 31 faces away from the second diaphragm 32.

[0084] Optionally, the sound waves of the first diaphragm 31 facing the first side and the sound waves of the second diaphragm 32 facing the first side are radiated together to the first side. In this way, the sound waves of the second diaphragm 32 and the sound waves of the first diaphragm 31 in the vibration system 3 can be superimposed to generate sound, so as to improve the sound generating 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 with the same phase, so as to increase the volume of the sound generating device 100.

[0085] In this embodiment, the housing 1 is used to house and fix structures such as the vibration system 3 and the magnetic circuit system 2. In this way, the sound generating device 100 can be used as an independent component in an electronic device or a sound generating module, which is not limited here. It can be understood that the outer contour of the sound generating device 100 can be circular or square, so that the outer contours of the housing 1, the magnetic circuit system 2 and the vibration system 3 are correspondingly set to be circular or square, which is specifically designed according to actual needs and is not limited here.

[0086] Optionally, the housing 1 has a cylindrical structure, that is, both ends of the housing 1 have openings and are in the shape of a circular cylinder with openings at both ends. The outer perimeters of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are substantially aligned and are similar to the outer contour of the housing 1. The first diaphragm 31 and the second diaphragm 32 are respectively connected to the openings at both ends of the housing 1, and the magnetic circuit system 2 is disposed in the cavity of the housing 1 and is located between the first diaphragm 31 and the second diaphragm 32. This facilitates the regular design of the shape of the sound generating device 100 and further facilitates its assembly into the whole machine, simplifying the reserved structure of the whole machine.

[0087] In this embodiment, as Figures 1 to 10 shown, the housing 1 includes a first housing body 11 and a second housing body 12 that are connected to each other. The side of the first housing body 11 facing away from the second housing body 12 is connected to the outer periphery of the first diaphragm 31. One end of the second housing body 12 away from the first housing body 11 is connected to the outside 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 housing body 11 facing away from the first diaphragm 31.

[0088] It can be understood that the first housing body 11 and the second housing body 12 of the housing 1 are optionally cylindrical, so that the first housing body 11 and the second housing body 12 are adaptively connected to form the cylindrical housing 1. By designing the housing 1 as a split first housing body 11 and second housing body 12, the first diaphragm 31 can be assembled through the first housing body 11, and the second diaphragm 32 can be assembled through the second housing body 12, which facilitates the assembly of the sound generating device 100 during the assembly process. In this embodiment, the first housing body 11 and the second housing body 12 of the housing 1 are respectively provided with conductive terminals, which further facilitates the electrical connection of the first voice coil 33 and the second voice coil 34 to the external circuit, etc.

[0089] In one embodiment, the first housing body 11 is provided with a first conductive member. One end of the first conductive member is electrically connected to the lead of the first voice coil 33. The second housing body 12 is provided with a second conductive member. One end of the second conductive member is electrically connected to the lead of the second voice coil 34. The other end of the first conductive member is connected to the other end of the second conductive member for connection to an external circuit.

[0090] It can be understood that by respectively providing the first conductive member and the second conductive member on the first housing body 11 and the second housing body 12, the first conductive member and the second conductive member are respectively electrically connected to the leads of the first voice coil 33 and the second voice coil 34. In this way, the external circuit can be connected and conducted to the first voice coil 33 and the second voice coil 34 through the first conductive member and the second conductive member.

[0091] Optionally, the other end of the first conductive member is connected to the other end of the second conductive member. In this way, the first conductive member and the second conductive member can be connected and conducted to the external circuit as an integral structure, thereby simplifying the circuit connection structure and improving the assembly efficiency.

[0092] In this embodiment, by setting the magnetic circuit system 2 as the central magnetic part 22, the edge magnetic part 23, and the magnetic yoke 21 connecting the central magnetic part 22 and the edge magnetic part 23, a first magnetic gap 25 is formed between the central magnetic part 22 and the magnetic yoke 21, and a second magnetic gap 26 is formed between the edge magnetic part 23 and the magnetic yoke 21. The second magnetic gap 26 is arranged to surround the first magnetic gap 25. In this way, it is convenient for 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 housing 1, so that both the first voice coil 33 and the second voice coil 34 are electrically connected to the conductive terminals. In this way, when current is passed through the first voice coil 33 and the second voice coil 34, the first voice coil 33 and the second voice coil 34 can convert electrical energy into mechanical energy in the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2 respectively, so as to drive the first voice coil 33 and the second voice coil 34 to drive the first diaphragm 31 and the second diaphragm 32 to vibrate respectively. Not only can sound be generated by driving two voice coils to drive two diaphragms to vibrate through one magnetic circuit system 2, but also the two-sided diaphragms can emit sound in the same direction without increasing the external dimensions, and the vibration area of the vibration system 3 is increased, so as to achieve the purpose of performance improvement.

[0093] In order to make the sound waves on the first side of the first diaphragm 31 and the sound waves on the first side of the second diaphragm 32 radiate to the first side together, and the sound waves are superimposed and enhanced to improve the high-frequency performance. In this embodiment, a through hole 27 that sequentially penetrates the central magnetic part 22 and the magnetic yoke 21 is provided in the magnetic circuit system 2, and the inner peripheral edge of the second diaphragm 32 is connected and fixed to the magnetic circuit system 2, and a third through hole 324 communicating with the through hole 27 is provided on the inner peripheral edge of the second diaphragm 32. In this way, the sound waves on the first side of the first diaphragm 31 are radiated outward through the through hole 27 and the third through hole 324, and radiate to the first side together with the sound waves on the first side of the second diaphragm 32.

[0094] In one embodiment, the outer peripheral edge of the first diaphragm 31 includes at least one straight edge 313 and at least one arc edge 314, and the straight edge 313 is connected to the arc edge 314, so that the outer contour of the first diaphragm 31 is non-circular. It can be 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 the irregular space reserved for the whole machine, so as to maximize the utilization of the irregular space, and the effective vibration area (Sd) of the first diaphragm 31 is maximized.

[0095] In this embodiment, the outer contour of the housing 1 is optionally similar to the outer contour of the first diaphragm 31. Of course, in other embodiments, the outer contour of the housing 1 is a circular structure, and a connecting surface or a connecting platform and other structures similar to the outer contour of the first diaphragm 31 are formed on the end surface where the housing 1 is connected to the first diaphragm 31, which is not limited here.

[0096] In one embodiment, asFigure 4 , Figure 6 , Figure 8 , Figure 10 As shown in Figure 10 , the end face of the housing 1 connected to the first diaphragm 31 includes at least one straight edge portion and at least one arc portion. The straight edge 313 is correspondingly connected to the straight edge portion, and the arc edge 314 is correspondingly connected to the arc portion. It can be understood that at least one straight edge portion and at least one arc portion are formed on the end face of the housing 1 connected to the first diaphragm 31, so that the straight edge 313 of the first diaphragm 31 is correspondingly connected to the straight edge portion of the housing 1, and the arc edge 314 of the first diaphragm 31 is correspondingly connected to the arc portion of the housing 1. In this way, the connection stability can be improved, and the sound generating device 100 can be adapted to the irregular space reserved for the whole machine, so as to maximize the utilization of the irregular space, and the effective vibration area (Sd) of the first diaphragm 31 can be maximized.

[0097] The sound generating device 100 of the present invention houses the magnetic circuit system 2 and the vibration system 3 in the housing 1, and the magnetic circuit system 2 is arranged as a central magnetic part 22, an edge magnetic part 23, and a magnetic yoke 21 connecting the central magnetic part 22 and the edge magnetic part 23, so that a first magnetic gap 25 is formed between the central magnetic part 22 and the magnetic yoke 21, and a second magnetic gap 26 is formed between the edge magnetic part 23 and the magnetic yoke 21. The second magnetic gap 26 is arranged to surround the first magnetic gap 25. The vibration system 3 is arranged as a first diaphragm 31, a second diaphragm 32, a first voice coil 33, and a second voice coil 34, so that the first diaphragm 31 and the second diaphragm 32 are respectively arranged on opposite sides of the magnetic circuit system 2 and connected to the housing 1. 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. Thus, when an electric current is passed through the first voice coil 33 and the second voice coil 34, the first voice coil 33 and the second voice coil 34 respectively convert electrical energy into mechanical energy in the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2, so as to drive the first voice coil 33 and the second voice coil 34 to drive the first diaphragm 31 and the second diaphragm 32 to vibrate respectively. Not only can two diaphragms be driven to vibrate by one magnetic circuit system 2 to generate sound, but also the double-sided diaphragms can generate sound in the same direction without increasing the external dimensions, and the vibration area of the vibration system 3 is increased, so as to achieve the purpose of performance improvement. At the same time, by providing a through hole 27 that sequentially penetrates the central magnetic part 22 and the magnetic yoke 21 in the magnetic circuit system 2, the first magnetic gap 25 is arranged to surround the through hole 27, and the inner peripheral edge of the second diaphragm 32 is connected to the magnetic circuit system 2, and a third through hole 324 communicating with the through hole 27 is provided at the inner peripheral edge of the second diaphragm 32. Thus, the sound waves on the first side of the first diaphragm 31 are radiated outward through the through hole 27 and the third through hole 324, and are radiated to the first side together with the sound waves on the first side of the second diaphragm 32, which is beneficial to the superposition of the compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate together on the first side, and improves the loudness and sensitivity of the sound generating device 100. Further, by setting the outer peripheral edge of the first diaphragm 31 to include at least one straight edge 313 and at least one arc edge 314, and the straight edge 313 is connected to the arc edge 314, the outer contour of the first diaphragm 31 presents a non-circular structure, so that the sound generating device 100 can be applied to the irregular space reserved in the whole machine to maximize the utilization of the irregular space, and the effective vibration area (Sd) of the first diaphragm 31 is maximized.

[0098] In one embodiment, as Figure 3 、 Figure 4 、 Figure 15As shown, the outer peripheral edge of the first diaphragm 31 includes a straight edge 313 and an arc edge 314. The straight edge 313 is connected to the arc edge 314, and the first diaphragm 31 is symmetrically arranged along the center line of the straight edge 313.

[0099] It can be understood that the outer contour of the first diaphragm 31 has a straight edge 313 and an arc edge 314. At this time, both ends of the straight edge 313 are respectively connected to both ends of the arc edge 314. Optionally, the first diaphragm 31 is symmetrically arranged along the center line of the straight edge 313.

[0100] In one embodiment, as Figure 8 、 Figure 16 shown, the outer peripheral edge of the first diaphragm 31 includes two straight edges 313 and two arc edges 314. Both ends of each straight edge 313 are respectively connected to one end of the two arc edges 314, and both ends of each arc edge 314 are respectively connected to one end of the two straight edges 313; wherein, the two straight edges 313 are symmetrically arranged, and the two arc edges 314 are symmetrically arranged.

[0101] It can be understood that the outer contour of the first diaphragm 31 has two straight edges 313 and two arc edges 314. At this time, the two straight edges 313 of the first diaphragm 31 are symmetrically arranged, and the two arc edges 314 are symmetrically arranged, so that the outer contour of the first diaphragm 31 presents a track-shaped structure, which is not limited here.

[0102] In one embodiment, the first diaphragm 31 includes a surround 311 and a dome 312. The surround 311 surrounds the dome 312. The outer edge of the surround 311 is connected to the housing 1, and the first voice coil 33 is connected to the dome 312.

[0103] In this embodiment, as Figures 2 to 4 、 Figures 7 to 9 、 Figure 15 、 Figure 16 shown, the surround 311 and the dome 312 of the first diaphragm 31 can be an integrally formed structure or a split arrangement, which is not limited here. It can be understood that the surround 311 of the first diaphragm 31 is a convex structure protruding upward or a concave structure recessed downward, which is not limited here. Optionally, the surround 311 protrudes in a direction away from the magnetic circuit system 2.

[0104] It can be understood that the outer edge of the surround 311 is connected to the housing 1, and the first voice coil 33 is connected to the dome 312. Thus, when the first voice coil 33 vibrates, it drives the first diaphragm 31 to vibrate, so that the sound wave of the first diaphragm 31 radiates outward along the through hole 27 and the third through hole 324, which is not limited here.

[0105] In this embodiment, the outer periphery of the surround portion 311 of the first diaphragm 31 includes at least one straight edge 313 and at least one arc edge 314, and the straight edge 313 is connected to the arc edge 314. Optionally, the outer contour of the dome 312 is similar to the outer contour of the surround portion 311, which is not limited herein.

[0106] Of course, in other embodiments, the outer contour of the dome 312 can be selected as a circle. The through hole 27 is a circular hole. At this time, the diameter of the dome 312 is defined as D1, and the diameter of the through hole 27 is defined as D2, D2≥0.3D1. It can be understood that the diameter sizes of the dome 312 and the through hole 27 directly affect the transmission of the sound wave of the first diaphragm 31. Through the above diameter design method, it can ensure the smooth transmission of the sound wave of the first diaphragm 31 and reduce the air flow sound.

[0107] In order to achieve the smooth transmission of the sound wave of 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, S5≥8.5%*S6. It can be understood that through the above projected area design method, it can ensure the smooth transmission of the sound wave of the first diaphragm 31 and reduce the air flow sound. In practical applications, select a suitable structural design according to specific requirements to meet the smooth transmission of the sound wave of the first diaphragm 31 and reduce the air flow sound, which is not limited herein.

[0108] In one embodiment, as Figures 1 to 3 、 Figure 5 、 Figure 7 、 Figure 9 shown, the second diaphragm 32 includes an inner surround 321, a vibrating portion 322 and an outer surround 323 connected in sequence. The inner periphery of the inner surround 321 is connected to the magnetic circuit system 2 and is provided with a third through hole 324. The outside of the outer surround 323 is connected to the housing 1, and the second voice coil 34 is connected to the vibrating portion 322; wherein, the second diaphragm 32 further includes a vibrating plate 325, and the vibrating plate 325 is disposed between the vibrating portion 322 and the second voice coil 34.

[0109] It can be understood that by setting the second diaphragm 32 as a double-surround structure, it is convenient for the second voice coil 34 to drive the second diaphragm 32 to vibrate while vibrating, and at the same time, the compliance of the second diaphragm 32 is improved, and its high-frequency performance is improved. The inner side of the inner surround 321 of the second diaphragm 32 can be an annular structure or a flat plate structure. When the inner side of the inner surround 321 is an annular structure, a third through hole 324 is formed inside the inner surround 321; when the inner side of the inner surround 321 is a flat plate structure, the flat plate structure is provided with a third through hole 324, which is not limited herein.

[0110] In this embodiment, the inner folding ring 321 and the outer folding ring 323 of the second diaphragm 32 are convex hull structures protruding upward or concave hull structures recessed downward, which are not limited herein. It can be understood that the inner folding ring 321 of the second diaphragm 32 protrudes in a direction away from the support member 24, so as to avoid interference of the support member 24 during the vibration of the second diaphragm 32. Optionally, both the inner folding ring 321 and the outer folding ring 323 of the second diaphragm 32 protrude in a direction away from the magnetic circuit system 2.

[0111] Optionally, the inner folding ring 321, the vibrating portion 322 and the outer folding ring 323 of the second diaphragm 32 are integrally formed structures, so as to simplify the processing steps of the second diaphragm 32 and improve the structural strength of the second diaphragm 32.

[0112] In one embodiment, as Figure 2 、 Figure 3 、 Figure 7 、 Figure 9 shown, the second diaphragm 32 further includes a vibrating plate 325, and the vibrating plate 325 is disposed between the vibrating portion 322 and the second voice coil 34. It can be 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 the second diaphragm 32 is prevented from being torn when the second voice coil 34 vibrates.

[0113] 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 housing 1 is provided with a first leakage hole 111 communicating the first cavity 13 with the outside; wherein, the sound wave on the second side of the second diaphragm 32 is radiated outward through the first leakage hole 111 and is radiated to the second side together with the sound wave on the second side of the first diaphragm 31.

[0114] It can be understood that, as Figure 2 、 Figure 7 、 Figure 9 shown, by providing the first leakage hole 111 communicating the first cavity 13 with the outside on the housing 1, the sound wave on the second side of the second diaphragm 32 and the sound wave on the second side of the first diaphragm 31 are radiated to the second side together. In this embodiment, the sound wave on the second side of the second diaphragm 32 is radiated outward through the first leakage hole 111 and is radiated to the second side together with the sound wave on the second side of the first diaphragm 31.

[0115] Optionally, a first leakage hole 111 communicating the first cavity 13 with the outside is provided on the housing 1, and the first leakage hole 111 penetrates through the surface of the housing 1 facing the second side. In this way, the sound wave on the second side of the second diaphragm 32 is radiated outward through the first leakage hole 111 and jointly radiated to the second side with the sound wave on the second side of the first diaphragm 31. At the same time, it is convenient to assemble the sound generating device 100 while avoiding the phenomenon of blocking the first leakage hole 111 during the assembly process, and it is also convenient to set structures such as a breathable member at the first leakage hole 111, simplifying the assembly difficulty.

[0116] Optionally, when the first leakage hole 111 penetrates through 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.

[0117] In this embodiment, the sound wave on the first side of the first diaphragm 31 is radiated outward through the through hole 27 and the third through hole 324 and jointly radiates the first sound wave to the first side with the sound wave on the first side of the second diaphragm 32. The sound wave on the second side of the second diaphragm 32 is radiated outward through the first leakage hole 111 and jointly radiates the second sound wave to the second side with the sound wave on the second side of the first diaphragm 31. Optionally, the first sound wave and the second sound wave are opposite in phase.

[0118] In actual application, the sound generating device 100 of the present application can have various application 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 the first sound wave to the external environment facing the first side, and the first diaphragm 31 and the second diaphragm 32 radiate the second sound wave to the external environment facing the second side. The first sound wave and the second sound wave are opposite in phase. In this way, both the first side and the second side of the sound generating device 100 are communicated with the external environment, and the sound waves on both sides radiate sound waves with opposite phases to the external environment, and the sound waves on both sides cancel each other out in the far field, which is suitable for environments that require far-field noise cancellation and privacy protection.

[0119] In one embodiment, the sound generating device 100 is applied to the 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. The first side is communicated with the front cavity 740, the second side is communicated with the rear cavity 750, the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction, and radiate the first sound wave to the front cavity 740 and the second sound wave to the rear cavity 750. The first sound wave and the second sound wave are opposite in phase.

[0120] Understandably, the first sides of the first diaphragm 31 and the second diaphragm 32 communicate with the front cavity, and the second sides of the first diaphragm 31 and the second diaphragm 32 communicate with the rear cavity. The electronic device usually has a sound outlet for the sound waves in the front cavity to radiate out. When using the electronic device, the sound waves in the front cavity can be radiated out through the sound outlet and received by the user. Further, the sound waves in the rear cavity are optionally radiated out through the rear leakage hole (the second leakage hole in this application). In this way, the sound waves in the front cavity and the rear cavity can form a sound dipole, achieving the technical effect of reducing sound leakage. Or, the sound waves in the rear cavity can not be radiated outwards. The sound generating device in this application only plays the role of enhancing the superposition of the sound waves on the first sides of the first diaphragm 31 and the second diaphragm 32, improving the high-frequency performance. Select and use according to the actual situation.

[0121] 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 housing 1. The central magnetic part 22 is disposed on the first top plate 211 and is spaced from the first side plate 213 to form a first magnetic gap 25. 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. Wherein, the magnetic circuit system 2 further includes a support member 24. The support member 24 is disposed on the side of the first top plate 211 facing away from the central magnetic part 22 and encloses with the first top plate 211 to form an air flow cavity 241. The through hole 27 sequentially penetrates through the central magnetic part 22 and the first top plate 211 and communicates with the air flow cavity 241. The support member 24 is provided with a second through hole 2421 communicating the air flow cavity 241 and the third through hole 324. The inner periphery of the second diaphragm 32 is connected to the support member 24. The first top plate 211 is further provided with a first through hole 2114 communicating the first magnetic gap 25 and the air flow cavity 241.

[0122] In this embodiment, as Figure 2 、 Figure 3 、 Figure 7 、 Figure 14 shown, by setting the support member 24 and setting the magnetic yoke 21 as a positive and negative stretching 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. While improving the stability, the reliability risk is reduced.

[0123] Understandably, by disposing 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 to form an air flow cavity 241, and 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 sequentially communicated to form the through hole 27.

[0124] In this embodiment, by providing the air flow cavity 241, the air flow area during the vibration of the first diaphragm 31 is effectively increased, thereby ensuring smoother air flow, improving the high-frequency performance of the first diaphragm 31, and thus improving the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32.

[0125] In one embodiment, the magnetic yoke 21 is further provided with a first through hole 2114 communicating the first magnetic gap 25 and the air flow cavity 241, and the first through hole 2114 is spaced apart from the fifth through hole; wherein, the sound waves on the first side facing the first diaphragm 31 are radiated outward through the through hole 27 and the third through hole 324, and at the same time are radiated outward through the first magnetic gap 25, the first through hole 2114, the air flow cavity 241, the second through hole 2421 and the third through hole 324.

[0126] In this embodiment, as Figure 2 , Figure 3 , Figure 7 , Figure 11 , Figure 12 , Figure 14As shown in the figure, by providing a support member 24 on the side of the magnetic yoke 21 facing away from the central magnetic part 22, the inner periphery of the second diaphragm 32 is connected and fixed by the support member 24. At the same time, an air flow cavity 241 is formed by enclosing the support member 24 and the magnetic yoke 21. A first through hole 2114 communicating the first magnetic gap 25 and the air flow cavity 241 is provided on the magnetic yoke 21, and a second through hole 2421 communicating the air flow cavity 241 is provided on the support member 24. A third through hole 324 is provided on the inner periphery of the second diaphragm 32. In this way, the sound waves on the first side facing the first diaphragm 31 sequentially pass through the first magnetic gap 25, the first through hole 2114, the air flow cavity 241, the second through hole 2421, and the third through hole 324 and radiate outwards. That is to say, the first magnetic gap 25, the first through hole 2114, the air flow cavity 241, the second through hole 2421, and the third through hole 324 are sequentially connected to form an air flow channel. And a through hole 27 communicating the air flow cavity 241 is provided in the magnetic circuit system 2, and the through hole 27 sequentially penetrates through the central magnetic part 22 and the magnetic yoke 21. In this way, the sound waves on the first side facing the first diaphragm 31 sequentially pass through the through hole 27, the air flow cavity 241, the second through hole 2421, and the third through hole 324 and radiate outwards. That is to say, the through hole 27, the air flow cavity 241, the second through hole 2421, and the third through hole 324 are sequentially connected to form another air flow channel. Thus, it is convenient for the sound waves on the first side of the first diaphragm 31 to radiate outwards to one side of the second diaphragm 32 through the two air flow channels. In this way, the sound waves on the first side facing the first diaphragm 31 and the second diaphragm 32 are radiated outwards on the same side (i.e., the first side) of the sound generating device 100, which is beneficial to the superposition of the compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate, and improves the loudness and sensitivity of the sound generating device 100. At the same time, the second diaphragm 32 and the central magnetic part 22 are respectively installed and fixed by the support member 24 and the magnetic yoke 21 to improve the installation stability, thereby reducing the reliability risk. And through the first through hole 2114 of the magnetic yoke 21 and the through hole 27 of the magnetic circuit system 2, respectively cooperating with the air flow cavity 241 formed by the magnetic yoke 21 and the support member 24, the air flow passage area when the first diaphragm 31 vibrates is effectively increased, so as to ensure that the air flow is smoother, improve the high-frequency performance of the first diaphragm 31, and thus improve the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32.

[0127] In this embodiment, the magnetic yoke 21 is a metal magnetic conductive plate. Optionally, the support member 24 is a metal part. It can be understood that the support member 24 and the magnetic yoke 21 can be connected by bonding or welding, which is not limited herein. Of course, in other embodiments, the support member 24 can be selected as an injection molded part. The support member 24 and the magnetic yoke 21 can be integrally injection molded, which is not limited herein.

[0128] Optionally, the magnetic yoke 21 may be an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form a first bottom plate 212, a first side plate 213, and a first top plate 211 that are sequentially connected. This can improve the structural strength of the magnetic yoke 21, thereby enhancing the installation stability. The first side plate 213 of the magnetic yoke 21 is optionally disposed around the periphery of the first top plate 211 and is disposed at an angle 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 in the receiving cavity, connected to the first top plate 211, and spaced from the first side plate 213 to enclose a first magnetic gap 25. The first bottom plate 212 is optionally connected to one end of the first side plate 213 away from the first top plate 211, and the first bottom plate 212 extends in a direction away from the receiving cavity and is disposed at an angle with the first side plate 213. The edge magnetic part 23 is disposed on the first bottom plate 212 and is spaced from the first side plate 213 to enclose a second magnetic gap 26, that is, the edge magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213.

[0129] It can be understood that the through hole 27 sequentially penetrates the central magnetic part 22 and the first top plate 211. In this embodiment, the first top plate 211 is provided with a fifth through hole and a first through hole 2114.

[0130] 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 vertically distributed 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 will not be too large, thereby achieving a thin and light design.

[0131] In this embodiment, as Figure 2 , Figure 3 , Figure 7 , Figure 11 , Figure 12 , Figure 14 shown, 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 encloses an air flow cavity 241 with the first top plate 211. The first top plate 211 is provided with a first through hole 2114 that communicates the air flow cavity 241 and the first magnetic gap 25.

[0132] It can be understood that the number of the first through holes 2114 is one or more. To keep the air flow unobstructed and ensure the vibration balance of the first diaphragm 31, the number of the first through holes 2114 is at least two. In specific applications, different numbers of the first through holes 2114 are set according to needs, and the first through holes 2114 are arranged at intervals. Optionally, there are multiple first through holes 2114, and the multiple first through holes 2114 are arranged at intervals. In this embodiment, the multiple first through holes 2114 are arranged around the central magnetic part 22 and are evenly and spacedly arranged.

[0133] In an embodiment, define the area of the first top plate 211 as S1, and define the opening area of the fifth through hole as S2, S2 = (10% - 80%)S1.

[0134] 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 wave of the first diaphragm 31 to radiate to the outside, and the structural strength of the magnetic yoke 21 and the connection area between the central magnetic part 22 and the first top plate 211 can be ensured, thereby improving stability. Optionally, the opening area S2 of the fifth through hole accounts for 10% - 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., which are not limited herein.

[0135] It can be understood that if the opening area of the fifth through hole is too small, it is not conducive to the sound wave of the first diaphragm 31 to radiate 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 is too small, which is not conducive to improving the connection reliability between the two.

[0136] It should be noted that the opening area of the first through hole 2114 on the first top plate 211 also affects the radiation of the sound wave of the first diaphragm 31 to the outside, that is, if the area of the first through hole 2114 is too small, it is not conducive to the sound wave of the first diaphragm 31 to radiate to the outside; of course, if the area of the first through hole 2114 is too large, the bonding area between the central magnetic part 22 and the first top plate 211 is too small, which is not conducive to improving the connection reliability between the two.

[0137] It can be understood that by controlling the opening area of the first through hole 2114 on the first top plate 211, it is beneficial for the sound wave of the first diaphragm 31 to radiate to the outside, and the structural strength of the magnetic yoke 21 and the connection area between the central magnetic part 22 and the first top plate 211 can be ensured, thereby improving stability.

[0138] It should be noted that when there is one first through hole 2114, the opening area of the first through hole 2114 is the opening area of one first through hole 2114. When there are multiple first through holes 2114, the opening area of the first through holes 2114 is the sum of the opening areas of the multiple first through holes 2114.

[0139] Optionally, the opening area of the first through hole 2114 accounts for 10% - 80% of the area of the first top plate 211. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., which is not limited herein.

[0140] In this embodiment, as Figure 2 , Figure 3 , Figure 7 , Figure 9 shown, the through hole 27 sequentially penetrates through the central magnetic part 22 and the first top plate 211. The central magnetic part 22 includes a centrally stacked magnet 221 and a central magnetic conductive plate 222, and the centrally stacked magnet 221 is connected to the first top plate 211. Optionally, the through hole 27 sequentially penetrates through the central magnetic conductive plate 222, the centrally stacked magnet 221, and the first top plate 211.

[0141] It can be understood that the central magnetic conductive plate 222 of the central magnetic part 22 is provided with a first through hole, the centrally stacked magnet 221 is provided with a second through hole, the first through hole and the second through hole are correspondingly 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 sequentially correspondingly connected to form the through hole 27.

[0142] Optionally, the first through hole, the second through hole, and the fifth through hole are coaxially arranged along the vibration direction of the vibration system 3.

[0143] In this embodiment, the first through hole 2114 of the first top plate 211 is arranged at an interval from the fifth through hole. Optionally, there are multiple first through holes 2114, and the multiple first through holes 2114 are arranged at intervals and surround the fifth through hole, which is not limited herein.

[0144] In order to further ensure the smooth flow of the air flow below the first diaphragm 31, improve the high-frequency performance of the first diaphragm 31, and further improve the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32. In one embodiment, the first top plate 211 includes a convex part 2111 and a supporting part 2112 connected to each other. The convex part 2111 protrudes from the first top plate 211 towards the central magnetic part 22, so that the supporting part 2112 surrounds the convex part 2111; wherein, the supporting part 2112 is provided with a first through hole 2114, the central magnetic part 22 is arranged on the convex part 2111 and is spaced from the supporting part 2112 to enclose an air flow channel 2115. The air flow channel 2115 communicates with the first magnetic gap 25 and the first through hole 2114. The support 24 is connected to the side of the supporting part 2112 facing away from the air flow channel 2115. The fifth through hole penetrates through the convex part 2111, that is, the through hole 27 sequentially penetrates through the central magnetic part 22 and the convex part 2111.

[0145] In this embodiment, as Figure 2 ,Figure 3 , Figure 7 , Figure 11 and Figure 12 As shown in Figure 3 , Figure 7 , Figure 11 and Figure 12 , by providing a protruding portion 2111 on the first top plate 211 of the magnetic yoke 21 that protrudes towards the central magnetic portion 22, the central magnetic portion 22 is provided on the protruding portion 2111 and spaced from the support portion 2112 to enclose an air flow channel 2115, and a first through hole 2114 is provided in the support portion 2112. In this way, the air flow channel 2115 is used to connect the first magnetic gap 25 and the first through hole 2114, which can not only ensure the smooth air flow below the first diaphragm 31 and improve the high-frequency performance of the first diaphragm 31, but also ensure the magnet volume of the central magnetic portion 22, thereby ensuring the magnetic field strength.

[0146] It can be understood that the protruding portion 2111 is located at the center of the first top plate 211, which facilitates the installation and fixation of the central magnetic portion 22. The support portion 2112 is arranged around the protruding portion 2111. In this way, a plurality of first through holes 2114 can be provided to ensure the smooth air flow below the first diaphragm 31. In this embodiment, the through hole 27 sequentially penetrates the central magnetic portion 22 and the protruding portion 2111, that is, the protruding portion 2111 is provided with a fifth through hole.

[0147] In this embodiment, as Figure 2 , Figure 3 , Figure 7 , Figure 11 and Figure 12 shown, an inclined surface 2113 is formed at the connection between the protruding portion 2111 and the support portion 2112, and the first through hole 2114 sequentially penetrates the support portion 2112 and the inclined surface 2113. It can be understood that the protruding portion 2111 is recessed from the side of the first top plate 211 of the magnetic yoke 21 facing the support 24 towards the direction away from the support 24, so that the side of the first top plate 211 facing the central magnetic portion 22 protrudes to form the protruding portion 2111, that is, it is formed by stamping or stretching, which is not limited here.

[0148] It can be understood that by providing the first through hole 2114 to sequentially penetrate the support portion 2112 and the inclined surface 2113, the opening area of the first through hole 2114 is further increased, ensuring the smooth air flow below the first diaphragm 31 and improving the high-frequency performance of the first diaphragm 31, while ensuring the magnet volume of the central magnetic portion 22, thereby ensuring the magnetic field strength. Optionally, the first through hole 2114 includes a plurality of them, and the plurality of first through holes 2114 are spaced apart and arranged around the protruding portion 2111.

[0149] In this embodiment, the outer contour of the first top plate 211 and the central magnetic portion 22 can be selected as circular. In order to further increase the opening area of the first through hole 2114, the first through hole 2114 can be selected as an arc-shaped hole extending along the circumference of the protruding portion 2111.

[0150] In one embodiment, the side of the supporting portion 2112 facing the support member 24 is recessed towards the air flow channel 2115 to form a support groove, and the peripheral edge of the support member 24 is limited within the support groove. It can be understood that by recessing the peripheral edge of the first top plate 211, the side of the supporting portion 2112 facing the support member 24 is recessed towards the air flow channel 2115 to form a support groove. In this way, the support groove can be used to position and install the support member 24, improving the installation accuracy.

[0151] In one embodiment, as Figure 2 、 Figure 3 、 Figure 7 、 Figure 9 shown, the central magnetic portion 22 includes a centrally stacked magnet 221 and a central magnetic conductive plate 222, and 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 clamped between the first top plate 211 and the central magnetic conductive plate 222, and the outer peripheral edges of the central magnet 221 and the central magnetic conductive plate 222 are spaced from the first side plate 213 of the magnetic yoke 21 to form a first magnetic gap 25.

[0152] Optionally, the central magnet 221 and the central magnetic conductive plate 222 of the central magnetic portion 22 can be circular plate-shaped or disc-shaped structures, which are not limited herein.

[0153] In this embodiment, the central magnetic portion 22 includes a centrally stacked magnet 221 and a central magnetic conductive plate 222, the central magnet 221 is connected to the first top plate 211, and the sixth through hole sequentially penetrates the central magnetic conductive plate 222 and the central magnet 221. It can be understood that the central magnet 221 is connected to the protruding portion 2111, and the through hole 27 sequentially penetrates the central magnetic conductive plate 222, the central magnet 221, and the protruding portion 2111.

[0154] In one embodiment, the support member 24 includes a second top plate 242, second side plates 243 provided on the periphery of the second top plate 242, and a second bottom plate 244 extending outward from one end of the second side plates 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 magnetic portion 22, so that the second top plate 242, the second side plates 243, and the first top plate 211 enclose an air flow chamber 241. The second top plate 242 is provided with a second through hole 2421, and the inner peripheral edge of the first diaphragm 31 is connected to the side of the second top plate 242 facing away from the air flow chamber 241, so that the third through hole 324 communicates with the second through hole 2421.

[0155] In this embodiment, as Figure 2 、 Figure 3 、 Figure 7 、 Figure 14As shown, the support member 24 can be optionally an integrally formed structure. The second side plate 243 is provided at the periphery of the second top plate 242 and is arranged at an angle with the second top plate 242, that is, the second side plate 243 and the second top plate 242 enclose a concave cavity. The second bottom plate 244 is connected to one end of the second side plate 243 away from the second top plate 242 and extends in a direction away from the concave cavity, that is, the second bottom plate 244 is arranged at an angle with the second side plate 243. 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. Moreover, 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 an air flow cavity 241 is formed by enclosing the second top plate 242, the second side plate 243 and the first top plate 211 of the magnetic yoke 21, and the inner periphery of the second diaphragm 32 is fixed by the second top plate 242 of the support member 24.

[0156] Optionally, the support member 24 is a metal part, and the second bottom plate 244 is adhesively connected or welded to the magnetic yoke 21, that is, the second bottom plate 244 is adhesively connected 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 herein.

[0157] It can be understood that the second top plate 242 of the support member 24 is provided with a second through hole 2421, so that the air flow 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 the third through hole 324 is one, that is, the second diaphragm 32 is an annular diaphragm, at this time, the inner periphery of the second diaphragm 32 forms the third through hole 324, 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 on the second top plate 242. When the third through hole 324 is multiple, at this time, 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 at least part of the multiple third through holes 324 corresponds to and communicates with the second through hole 2421, which is not limited herein.

[0158] Optionally, the second through hole 2421 is one, and the second through hole 2421 corresponds to and communicates with the third through hole 324; or, the second through hole 2421 includes multiple ones, and the multiple second through holes 2421 are arranged at intervals.

[0159] 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, optionally, the multiple second through holes 2421 and the multiple third through holes 324 are arranged in one-to-one correspondence, which is not limited herein.

[0160] In an 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% - 80%)S3.

[0161] 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 wave of the first diaphragm 31 to radiate to the outside, and it can also ensure 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% - 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., which are not limited herein.

[0162] It can be understood that if the area of the second through hole 2421 is too small, it is not conducive to the sound wave of the first diaphragm 31 radiating 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 is too small, which is not conducive to improving the connection reliability between the two.

[0163] It should be noted that when there is one second through hole 2421, the opening area S4 of the second through hole 2421 is the opening area of one second through hole 2421. When there are multiple second through holes 2421, the opening area S4 of the second through hole 2421 is the sum of the opening areas of multiple second through holes 2421.

[0164] In the second embodiment, the magnetic yoke 21 includes a first bottom plate 212, a first side plate 213 and a first top plate 211. 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. The periphery of the first bottom plate 212 is connected to the housing 1. The central magnetic part 22 is arranged on the first top plate 211 and is spaced from the first side plate 213 to enclose a first magnetic gap 25. The edge magnetic part 23 is arranged on the first bottom plate 212 and is spaced from the first side plate 213 to enclose a second magnetic gap 26. The through hole 27 sequentially penetrates through the central magnetic part 22 and the first top plate 211; wherein, the magnetic yoke 21 further includes a support plate 214 formed by bending and extending from the inner peripheral edge of the first top plate 211 adjacent to the through hole 27 in a direction away from the central magnetic part 22, and the inner peripheral edge of the second diaphragm 32 is connected to one end of the support plate 214 away from the first top plate 211.

[0165] In this embodiment, as Figure 9 and Figure 13As shown, the magnetic yoke 21 can be optionally an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form a first bottom plate 212, a first side plate 213, a first top plate 211, and a support plate 214 connected in sequence. In this way, the structural strength of the magnetic yoke 21 can be improved, thereby enhancing the installation stability.

[0166] It can be understood that the first side plate 213 of the magnetic yoke 21 is optionally disposed around the periphery of the first top plate 211 and is disposed at an angle 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 in the receiving cavity, connected to the first top plate 211, and spaced from the first side plate 213 to enclose a first magnetic gap 25. The first bottom plate 212 is optionally connected to one end of the first side plate 213 away from the first top plate 211, and the first bottom plate 212 extends in a direction away from the receiving cavity and is disposed at an angle with the first side plate 213. The edge magnetic part 23 is disposed on the first bottom plate 212 and spaced from the first side plate 213 to enclose a second magnetic gap 26, that is, the edge magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213.

[0167] 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 up and down 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. In this way, it is ensured that the size of the magnetic circuit system 2 along the vibration direction of the vibration system 3 will not be too large, thereby realizing a thin and light design.

[0168] In this embodiment, as Figure 9 and Figure 13 shown, the support plate 214 is formed by bending and extending from 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. In this way, the inner periphery of the second diaphragm 32 can be connected and fixed by the support plate 214.

[0169] 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 bottom plate 212, a first side plate 213, and a first top plate 211. By additionally providing a support member 24, the support member 24 and the first top plate 211 of the magnetic yoke 21 are used to fix the second diaphragm 32 and the central magnetic portion 22 respectively. And by forming an air flow chamber 241 between the support member 24 and the first top plate 211, and providing a first through hole 2114 communicating with the air flow chamber 241 on the first top plate 211, the air flow on the side of the first diaphragm 31 facing the first side can be radiated outward through two channels, thereby ensuring smooth air flow of the first diaphragm 31, improving the high-frequency performance of the first diaphragm 31, and further improving the high-frequency performance after the first diaphragm 31 and the second diaphragm 32 are stacked. In the second embodiment, the magnetic yoke 21 is integrally stretched to form a first bottom plate 212, a first side plate 213, a first top plate 211, and a support plate 214, and the support plate 214 and the first top plate 211 are used to fix the second diaphragm 32 and the central magnetic portion 22 respectively to ensure connection stability.

[0170] Optionally, the first bottom plate 212 is provided with an avoidance groove 2121 corresponding to the second magnetic gap 26, and the avoidance groove 2121 is used to provide avoidance for the second voice coil 34. It can be understood that the avoidance groove 2121 provides an avoidance space for the second voice coil 34, thereby improving the performance of the sound generating device 100.

[0171] In one embodiment, as Figure 2 、 Figure 3 、 Figure 7 、 Figure 9 shown, the edge magnetic portion 23 includes a stacked edge magnet 231 and an edge magnetic guide plate 232, and the edge magnet 231 is connected to the magnetic yoke 21. It can be understood that the edge magnet 231 is connected to the first bottom plate 212 of the magnetic yoke 21, that is, the edge magnet 231 is clamped between the first bottom plate 212 and the edge magnetic guide plate 232, and the inner circumferences of the edge magnet 231 and the edge magnetic guide plate 232 are both spaced 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 portion 23 can be a circular ring structure, which is not limited herein.

[0172] In order to further improve the connection stability, in this embodiment, the edge magnetic guide plate 232 and the housing 1 are an integrally formed structure. It can be understood that the housing 1 can be made of a metal material or a plastic material. When the housing 1 is made of a metal material, the housing 1 and the edge magnetic guide plate 232 are integrally processed, which can not only simplify the processing steps but also improve the heat dissipation effect. When the housing 1 is made of a plastic material, the housing 1 and the edge magnetic guide plate 232 can be integrally injection molded, which is not limited herein.

[0173] Optionally, the side magnetic conduction plate 232 and the second housing 12 of the housing 1 are integrally formed structures, which are not limited herein. In this embodiment, the side magnetic conduction plate 232 is injection molded on the housing 1, and the first leakage hole 111 is formed by removing material from the side magnetic conduction plate 232 and / or the corresponding housing 1 area. It can be understood that by removing material on the side magnetic conduction plate 232 or on the housing 1 or simultaneously on the side magnetic conduction plate 232 and the housing 1 to form the first leakage hole 111, the first leakage hole 111 does not additionally occupy the radial dimension of the sound generating device 100, or the size of the first leakage hole 111 can be increased under the limited size of the sound generating device 100 to balance the internal pressure.

[0174] In one embodiment, the second diaphragm 32 is annular, a third through hole 324 is formed at the inner edge of the second diaphragm 32, and the sound generating device 100 further includes a second air permeable member, which is connected to the inner edge of the second diaphragm 32 and covers the third through hole 324.

[0175] In this embodiment, as Figures 1 to 3 、 Figure 5 、 Figure 7 、 Figure 9 shown, the second diaphragm 32 can be selected as an annular diaphragm. At this time, a third through hole 324 is formed at the inner edge of the second diaphragm 32, that is, a third through hole 324 is formed at the inner edge of the second diaphragm 32. It can be understood that by providing the second air permeable member, the second air permeable member is connected to the inner edge of the second diaphragm 32 and covers the third through hole 324, so as to prevent external dust or impurities from entering the interior of the sound generating device 100 by using the second air permeable member, thereby avoiding affecting the acoustic performance of the sound generating device 100.

[0176] In one embodiment, a first cavity 13 is formed among 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 the first cavity 13 with the outside. Optionally, the sound generating device 100 further includes a first air permeable member, and the first air permeable member covers the first leakage hole 111.

[0177] It should be noted that in the first embodiment, as Figure 2 、 Figure 7 shown, a first cavity 13 is formed among the second diaphragm 32, the housing 1, the magnetic yoke 21, and the support member 24; in the second embodiment, as Figure 9 shown, a first cavity 13 is formed among the second diaphragm 32, the housing 1, and the magnetic yoke 21.

[0178] In this embodiment, as Figure 2 、 Figure 7 、 Figure 9As shown, the first cavity 13 can be optionally a sealed cavity. To balance the air pressure in the first cavity 13 and improve the vibration balance of the second diaphragm 32. It can be understood that by providing a first leakage hole 111 on the sound generating device 100 that communicates the first cavity 13 with the outside, the first leakage hole 111 is used to release air, adjust the air pressure in the first cavity 13, balance the air pressure on both sides of the second diaphragm 32, and improve the vibration stability of the second diaphragm 32.

[0179] Optionally, the first leakage hole 111 includes a plurality of them. In this embodiment, the plurality of first leakage holes 111 are symmetrically arranged along the circumferential direction of the sound generating device 100. In this way, the first leakage hole 111 is used to balance the air pressure in the first cavity 13 and improve the vibration balance of the second diaphragm 32.

[0180] In this embodiment, by providing a first air-permeable member on the first leakage hole 111 and using the first air-permeable member to cover the first leakage hole 111, on the one hand, it can prevent external dust or impurities from entering the inside of the sound generating device 100, thus avoiding affecting the acoustic performance of the sound generating device 100; on the other hand, it can further adjust the air flow rate in the first cavity 13, adjust the air pressure in the first cavity 13, balance the air pressure on both sides of the second diaphragm 32, and improve the vibration stability of the second diaphragm 32.

[0181] In one embodiment, the housing 1 includes a first housing 11 and a second housing 12 connected to each other. One end of the first housing 11 away from the second housing 12 is connected to the outer periphery of the first diaphragm 31, and one side of the second housing 12 facing away from the first housing 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 housing 11, that is, the outer periphery of the first bottom plate 212 is connected to the first housing 11.

[0182] Optionally, the first housing 11 is provided with a first leakage hole 111. The first leakage hole 111 penetrates the surface of the first housing 11 facing the second side. The first leakage hole 111 is located outside the first diaphragm 31 and is arranged corresponding to a straight edge 313.

[0183] It can be understood that by setting it in this way, the sound wave of the second diaphragm 32 facing the second side can be radiated outward through the first leakage hole 111 and superimposed with the sound wave of the first diaphragm 31 facing the second side to radiate together to the second side, so as to achieve the superposition of the air compressed when the first diaphragm 31 and the second diaphragm 32 jointly release air or vibrate to the second side, improve the loudness and sensitivity of the sound generating device 100, reduce the assembly difficulty, and increase the adaptability of the overall machine assembly. At the same time, the straight edge 313 of the first diaphragm 31 is used to avoid the first leakage hole 111, so that the first leakage hole 111 and the first diaphragm 31 are both located on one side of the housing 1 facing the second side.

[0184] Of course, in other embodiments, the side wall of the first housing 11 or the second housing 12 is provided with a first leakage hole 111; alternatively, a first leakage hole 111 is formed at the connection between the first housing 11 and the second housing 12, which is not limited herein.

[0185] It can be understood that by providing the first leakage hole 111 and providing a first air-permeable member at the first leakage hole 111, in this way, the air flow velocity in the cavity of the sound generating device 100 can be further adjusted, and the acoustic resistance can be adjusted, thereby improving the performance of the sound generating device 100.

[0186] In an embodiment, a support platform 112 is convexly provided on the inner wall of the first housing 11. The outer peripheral edge of the magnetic yoke 21 and the outer peripheral edge of the first diaphragm 31 are respectively arranged 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, and a first leakage hole 111 is formed between the inner wall of the first housing 11 and the support platform 112.

[0187] In this embodiment, as Figure 2 、 Figure 3 、 Figure 7 、 Figure 9 、 Figure 10 shown, by providing the support platform 112 on the inner wall of the first housing 11 of the outer housing 1, the outer peripheral edge of the magnetic yoke 21 and the outer peripheral edge of the first diaphragm 31 are fixed by the support platform 112 at the same time, that is, the outer peripheral edge of the magnetic yoke 21 and the outer peripheral edge of the first diaphragm 31 are respectively arranged on both sides of the support platform 112.

[0188] It can be understood that a first leakage hole 111 is formed between the inner wall of the first housing 11 and the support platform 112. In this way, it can be ensured that the first leakage hole 111 penetrates the surface of the first housing 11 facing the second side, so that the first leakage hole 111 and the first diaphragm 31 are both located on the first side of the sound generating device 100, which is beneficial to simplifying the assembly difficulty and enabling 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.

[0189] In an embodiment, the side magnetic part 23 includes a side magnet 231 and a side magnetic guide plate 232 which are stacked. The side magnet 231 is connected to the magnetic yoke 21, the side magnetic guide plate 232 is connected to the second housing 12, and a leakage channel 121 communicating with the first leakage hole 111 is formed between the side magnetic guide plate 232 and the second housing 12.

[0190] In this embodiment, the side magnetic conduction plate 232 and the second housing 12 can be integrally formed. It can be understood that the first housing 11 can be a plastic housing, and the outer peripheral edge of the magnetic yoke 21 is integrally injection-molded with the first housing 11, which can simplify the processing steps and assembly steps. Of course, in other embodiments, the side magnetic conduction plate 232 is adhesively connected to the second housing 12, and the outer peripheral edge of the magnetic yoke 21 and the first housing 11 can also be adhesively connected. As Figure 2 , Figure 7 , Figure 9 shown, the outer peripheral edge of the magnetic yoke 21 is adhesively connected to the support platform 112.

[0191] In an embodiment, as Figure 2 , Figure 3 , Figure 7 , Figure 9 shown, the sound generating device 100 further includes a first positioning ring 41, and the first positioning ring 41 is disposed between the outer peripheral edge of the first diaphragm 31 and the housing 1. Optionally, the first positioning ring 41 can be a steel ring. By using the first positioning ring 41 between the outer peripheral edge of the folded ring portion 311 of the first diaphragm 31 and the housing 1, the first diaphragm 31 is convenient to be taken during the assembly process, and at the same time, the assembly accuracy is improved, and the performance of the sound generating device 100 is improved.

[0192] In an embodiment, as Figure 2 , Figure 3 , Figure 7 , Figure 9 shown, the sound generating device 100 further includes a second positioning ring 42, and the second positioning ring 42 is disposed between the outer peripheral edge of the second diaphragm 32 and the housing 1. Optionally, the second positioning ring 42 can be a steel ring. By using the second positioning ring 42 between the outer peripheral edge of the outer folded ring 323 of the second diaphragm 32 and the housing 1, the second diaphragm 32 is convenient to be taken during the assembly process, and at the same time, the assembly accuracy is improved, and the performance of the sound generating device 100 is improved.

[0193] In an embodiment, the sound generating device 100 further includes a front cover 6. The peripheral edge of the front cover 6 is connected to the housing 1 and is located on the side of the first diaphragm 31 facing away from the second diaphragm 32. The outer peripheral contour of the front cover 6 is similar to the outer peripheral 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 communicating the second cavity 61 and the outside; wherein, the sound wave on the side of the first diaphragm 31 facing the second side is radiated outward through the fourth through hole 62.

[0194] In this embodiment, as Figures 1 to 3 , Figure 6 , Figure 7 , Figure 9 , Figure 17As shown, by providing the front cover 6, on the one hand, the first diaphragm 31 is protected by the front cover 6, and on the other hand, a second cavity 61 is formed between the front cover 6 and the first diaphragm 31 to ensure the amplitude of the first diaphragm 31. It can be understood that by providing a fourth through hole 62 in the front cover 6 that communicates the second cavity 61 with the outside, it is convenient for the sound waves on the second side of the first diaphragm 31 to radiate outward through the fourth through hole 62. Optionally, the outer peripheral contour of the front cover 6 is similar to the outer peripheral contour of the first diaphragm 31.

[0195] Optionally, the front cover 6 is a metal part formed by processing a metal material, which is convenient for strongly supporting the sound generating device 100 during the assembly process of the sound generating device 100 and also reduces the occupation of the overall machine size. In a specific application, a suitable number of fourth through holes 62 are set according to the actual situation, and it is not limited to a fixed number. Preferably, a damping member or a breathable film is provided on the fourth through hole 62, etc., which can further adjust the air flow velocity in the second cavity 61 and adjust the acoustic resistance of the second cavity 61.

[0196] In one embodiment, as Figure 2 , Figure 6 , Figure 7 , Figure 10 shown, at one end of the housing 1 facing away from the second diaphragm 32, there is also provided a support boss 113 and a retaining wall 114 connected to the support boss 113. The front cover 6 includes a top cover portion 63, a side plate portion 64 provided on the periphery of 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 on the support boss 113, and the surface of the retaining wall 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.

[0197] It can be understood that by providing the support boss 113 and the retaining wall 114 on the housing 1, the front cover 6 is supported and fixed by the support boss 113 and the retaining wall 114, and at the same time, 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 an integrally formed structure. The front cover 6 is connected to the housing 1 through the edge portion 65, and the top cover portion 63 is supported by the side plate portion 64, so that a second cavity 61 is formed between the first diaphragm 31 and the front cover 6.

[0198] In another embodiment, as Figure 9 and Figure 17 shown, the front cover 6 includes a top cover portion 63, a side plate portion 64 provided on 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 housing 1, and a limiting space 67 is formed between the bent portion 66 and the edge portion 65 and the housing 1. The periphery of the first diaphragm 31 is limited within the limiting space 67. The top cover portion 63 is provided with a fourth through hole 62.

[0199] In this embodiment, by setting the front cover 6 as an integrally formed top cover portion 63, side plate portion 64, edge portion 65 and bending portion 66, the bending portion 66 of the front cover 6 is connected to the housing 1, so that a limiting space 67 is formed between the bending portion 66 and the edge portion 65 and the housing 1. In this way, the peripheral edge of the first diaphragm 31 can be accommodated and limited in the limiting space 67, thereby increasing the effective vibration area of the first diaphragm 31, and synchronously increasing the volume of the second cavity 61, so as to improve the acoustic performance of the first diaphragm 31.

[0200] As Figures 18 to 20 As shown, the present invention also provides an electronic device 800, which includes the above-mentioned sound generating device 100. The specific structure of the sound generating device 100 refers to the foregoing embodiments. Since this electronic device adopts all the technical solutions of the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, and will not be elaborated herein one by one.

[0201] In one embodiment, the electronic device 800 further includes a device housing 700. The device housing 700 is provided with a receiving cavity 710. The sound generating device 100 is disposed in the receiving cavity 710 and divides the receiving cavity 710 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 communicates with the front cavity 740. Among them, the device housing 700 is provided with a sound outlet hole 720 communicating with 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 hole 720.

[0202] In this embodiment, the device housing 700 can be a metal housing or a plastic housing, which is not limited herein. The device housing 700 can be an integrally formed structure or a split structure, which is not limited herein. Optionally, the device housing 700 includes an upper shell and a lower shell, and the upper shell and the lower shell can be adhesively connected or welded to enclose the receiving cavity 710.

[0203] Optionally, the outer contour of the device housing 700 can be a square structure. In specific applications, other suitable shapes such as a circle can be selected according to actual situations, and it is not limited to a specific shape.

[0204] It can be understood that a sound outlet hole 720 communicating with the front cavity 740 is provided on the upper shell of the device housing 700, so that the sound waves on 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 hole 720.

[0205] In this embodiment, the second side of the sound generating device 100 communicates with the rear cavity 750. The first cavity 13 of the sound generating device 100 communicates with the rear cavity 750 through the first leakage hole 111. The sound waves on the second side of the first diaphragm 31 and the second diaphragm 32 of the sound generating device 100 radiate backward 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 on the second side of the first diaphragm 31 and the second diaphragm 32 are out of phase with the sound waves on the first side.

[0206] In one embodiment, the device housing 700 is further provided with a second leakage hole 730, and the second leakage hole 730 communicates with the rear cavity 750. Among them, the first diaphragm 31 and the second diaphragm 32 of the sound generating device 100 radiate sound waves into the rear cavity 750 that are out of phase with the sound waves in the front cavity 740, and the sound waves in the rear cavity 750 are radiated to the outside through the second leakage hole 730.

[0207] It can be understood that as Figures 18 to 20 shown, the second leakage hole 730 is provided on the lower housing 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 into the rear cavity 750 that are out of phase with the sound waves in the front cavity 740, and the sound waves in the rear cavity 750 are radiated to the outside through the second leakage hole 730. Optionally, a damping member for adjusting the acoustic resistance is provided on the second leakage hole 730.

[0208] In this embodiment, the second leakage hole 730 is provided on the lower housing of the device housing 700. The second leakage hole 730 communicates with the rear cavity 750 and is used to adjust the pressure in the rear cavity 750 and further adjust the air pressure in the first cavity 13. At the same time, the sound waves in the rear cavity 750 are radiated to the outside through the second leakage hole 730. The sound waves in the rear cavity 750 are out of phase with the sound waves in the front cavity 740, which can play the role of a sound dipole and achieve the technical effects of far-field noise cancellation and protecting user privacy.

[0209] In this embodiment, the second leakage hole 730 can be selected as a round hole, an oval hole, a polygonal hole, etc., which is not limited herein. The number of the second leakage holes 730 can be one or more, which is specifically designed according to actual applications and is not limited herein.

[0210] In this embodiment, the upper housing includes a top wall and a first side wall, and the lower housing includes a bottom wall and a second side wall. The first side wall and the second side wall together form the side wall of the housing of the electronic device 800, that is, the device housing 700 includes a top wall and a bottom wall arranged opposite to each other and a side wall connecting the top wall and the bottom wall. Optionally, the sound outlet hole 720 is provided on the top wall or the connection area between the side wall and the top wall, and the second leakage hole 730 is provided on the side wall or the bottom wall or the connection area between the side wall and the bottom wall. In this way, the sound generating performance of the electronic device 800 and the technical effect of protecting privacy can be taken into account, and the most suitable design scheme can be selected according to actual needs during use, which is not limited in this application.

[0211] The above are only alternative embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A sound generating device, characterized in that, The sound generating device includes: a housing; a magnetic circuit system, which is connected to the housing. The magnetic circuit system includes a central magnetic part, a peripheral magnetic part, and a magnetic yoke connecting the central magnetic part and the peripheral magnetic part. A first magnetic gap is formed between the central magnetic part and the magnetic yoke, and a second magnetic gap is formed between the peripheral magnetic part and the magnetic yoke. The second magnetic gap surrounds the first magnetic gap. The magnetic circuit system is also provided with a through hole that sequentially penetrates the central magnetic part and the magnetic yoke, and the first magnetic gap surrounds the through hole; and a vibration system, which includes a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil. The first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system. The outer peripheral edge of the first diaphragm is connected to the housing and is opposite to and spaced from the magnetic circuit system. The outer peripheral edge of the second diaphragm is connected to the housing, and the inner peripheral edge of the second diaphragm is connected to the magnetic circuit system. A third through hole communicating with the through hole is provided at the inner peripheral edge of the second diaphragm. 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; wherein, the outer peripheral edge of the first diaphragm includes at least one straight edge and at least one arc edge, and the straight edge is connected to the arc 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. The sound wave on the first side facing the first diaphragm is radiated outward through the through hole and the third through hole, and jointly radiates to the first side with the sound wave on the first side facing the second diaphragm.

2. The sound generating device according to claim 1, wherein The outer peripheral edge of the first diaphragm includes a straight edge and an arc edge, and the straight edge is connected to the arc edge. The first diaphragm is symmetrically arranged along the center line of the straight edge; or, the outer peripheral edge of the first diaphragm includes two straight edges and two arc edges. Each end of each straight edge is respectively connected to one end of two arc edges, and each end of each arc edge is respectively connected to one end of two straight edges; wherein, the two straight edges are symmetrically arranged, and the two arc edges are symmetrically arranged; and / or, the end surface of the housing connected to the first diaphragm includes at least one straight edge part and at least one arc part, and the straight edge is correspondingly connected to the straight edge part, and the arc edge is correspondingly connected to the arc part.

3. The sound generating device according to claim 1, wherein The first diaphragm includes a surround and a dome. The surround surrounds the dome. The outer edge of the surround 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. And / or, the second diaphragm includes an inner folding ring, a vibrating portion, and an outer folding ring connected in sequence. The inner peripheral edge of the inner folding ring is connected to the magnetic circuit system and is provided with the third through hole. The outer side of the outer folding ring is connected to the housing. The second voice coil is connected to the vibrating portion. Wherein, the second diaphragm further includes a vibrating plate, and the vibrating plate is disposed between the vibrating portion and the second voice coil.

4. The sound generating device according to claim 1, wherein, The magnetic yoke includes a first bottom plate, a first side plate, and a first top plate. The first top plate and the first bottom plate are connected to two ends of the first side plate along the vibration direction of the vibration system. The peripheral edge of the first bottom plate is connected to the housing. The central magnetic portion is disposed on the first top plate and is spaced from the first side plate to enclose the first magnetic gap. The side magnetic portion is disposed on the first bottom plate and is spaced from the first side plate to enclose the second magnetic gap. The through hole sequentially penetrates the central magnetic portion and the first top plate. Wherein, the magnetic yoke further includes a support plate formed by bending and extending from the inner peripheral edge of the first top plate adjacent to the through hole in a direction away from the central magnetic portion. The inner peripheral edge of the second diaphragm is connected to one end of the support plate away from the first top plate.

5. The sound generating device according to claim 1, wherein, 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 housing. The central magnetic portion is disposed on the first top plate and is spaced from the first side plate to form the first magnetic gap. The side magnetic portion is disposed on the first bottom plate and is spaced from the first side plate to form the second magnetic gap. Wherein, the magnetic circuit system further includes a support member. The support member is disposed on a side of the first top plate facing away from the central magnetic portion and encloses an air flow cavity with the first top plate. The through hole sequentially penetrates the central magnetic portion and the first top plate and is communicated with the air flow cavity. The support member is provided with a second through hole communicating the air flow cavity and the third through hole. The inner peripheral edge of the second diaphragm is connected to the support member. The first top plate is further provided with a first through hole communicating the first magnetic gap and the air flow cavity.

6. The sound generating device according to claim 5, wherein, The support member includes a second top plate, a second side plate disposed on the periphery of the second top plate, and a second bottom plate formed by extending outward from one end of the second side plate away from the second top plate. The second bottom plate is connected to a side of the first top plate facing away from the central magnetic portion, so that the second top plate, the second side plate, and the first top plate enclose the air flow cavity. The second top plate is provided with the second through hole. The inner peripheral edge of the first diaphragm is connected to a side of the second top plate facing away from the air flow cavity, so that the third through hole is communicated with the second through hole. Wherein, there is one second through hole, and the second through hole is correspondingly communicated with the third through hole; or, there are multiple second through holes, and the multiple second through holes are arranged at intervals; and / or, define the area of the second top plate as S3, and define the opening area of the second through hole as S4, S4 = (10% - 80%)S3; and / or, the support member is a metal member, and the second bottom plate is adhesively connected 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 according to claim 1, wherein A first cavity is formed among the second diaphragm, the housing, and the magnetic circuit system, and the housing is provided with a first leakage hole communicating the first cavity with the outside. Wherein, the sound wave on the second side of the second diaphragm is radiated outward through the first leakage hole, and jointly radiates to the second side with the sound wave on the second side of the first diaphragm.

8. The sound generating device according to claim 7, wherein The housing includes a first housing body and a second housing body connected to each other. One end of the first housing body away from the second housing body is connected to the outer periphery of the first diaphragm, one side of the second housing body facing away from the first housing body is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the first housing body. Wherein, the first housing body is provided with the first leakage hole, the first leakage hole penetrates through the surface of the first housing body facing the second side, the first leakage hole is located outside the first diaphragm and is correspondingly arranged corresponding to one of the straight edges; or, the side wall of the first housing body or the second housing body is provided with the first leakage hole; or, the connection part between the first housing body and the second housing body forms the first leakage hole.

9. The sound generating device according to claim 8, wherein, A support platform is convexly provided on the inner wall of the first housing body. The outer periphery of the magnetic yoke and the outer periphery of the first diaphragm are respectively arranged on both sides of the support platform. The outer contour of the support platform is similar to the outer contour of the first diaphragm, and the first leakage hole is formed between the inner wall of the first housing body and the support platform. And / or, the edge magnetic part includes a laminated edge magnet and an edge magnetic plate. The edge magnet is connected to the magnetic yoke, the edge magnetic plate is connected to the second housing body, and a leakage channel communicating the first leakage hole is formed between the edge magnetic plate and the second housing body; wherein, the edge magnetic plate and the second housing body are of an integrally formed structure; or, the edge magnetic plate is adhesively connected to the second housing body. And / or, the first housing body is provided with a first conductive member. One end of the first conductive member is electrically connected to the lead of the first voice coil. The second housing body is provided with a second conductive member. One end of the second conductive member is electrically connected to the lead of the second voice coil. The other end of the first conductive member is connected to the other end of the second conductive member for connecting to an external circuit. And / or, the first housing body is a plastic housing body, and the outer periphery of the magnetic yoke is integrally injection molded with the first housing body; or, the outer periphery of the magnetic yoke is adhesively connected to the first housing body. And / or, the sound generating device further includes a first air permeable member covering the first leakage hole.

10. The sound generating device according to claim 1, wherein The sound generating device further includes a front cover. The periphery of the front cover is connected to the housing and is located on the side of the first diaphragm facing away from the second diaphragm. The outer peripheral contour of the front cover is similar to the outer peripheral 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 the second cavity with the outside. Wherein, the sound wave of the first diaphragm facing the second side is radiated outward through the fourth through hole.

11. The sound generating device according to claim 10, wherein, One end of the housing facing away from the second diaphragm is further provided with a support boss and a retaining wall connected to the support boss. The front cover includes a top cover portion, a side plate portion provided on the periphery of the top cover portion, and an edge portion extending outward from the end of the side plate portion away from the top cover portion. The edge portion is supported on the support boss. The surface of the retaining wall facing the second side protrudes from the surface of the edge portion facing the second side. The top cover portion is provided with the fourth through hole. Alternatively, the front cover includes a top cover portion, a side plate portion provided on the periphery of the top cover portion, an edge portion extending outward from the 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 housing, and a limiting space is formed between the bent portion and the edge portion and the housing. The periphery of the first diaphragm is limited within the limiting space. 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. The first diaphragm and the second diaphragm radiate a first sound wave to the outside environment facing the first side, and the first diaphragm and the second diaphragm radiate a second sound wave to the outside environment facing the second side. The first sound wave and the second sound wave are opposite in phase; 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 communicates with the front cavity, and the second side communicates with the rear cavity. The first diaphragm and the second diaphragm vibrate in the same direction, radiate a first sound wave to the front cavity, and radiate a second sound wave to the rear cavity. The first sound wave and the second sound wave are opposite in phase. And / or, the second diaphragm is annular, and the inner edge of the second diaphragm forms the third through hole. The sound generating device further includes a second air-permeable member, and the second air-permeable member is connected to the inner edge of the second diaphragm and covers the third through hole. And / or, the sound generating device further includes a first positioning ring, and the first positioning ring is provided between the outer periphery of the first diaphragm and the housing. And / or, the sound generating device further includes a second positioning ring, and the second positioning ring is provided between the outer periphery of the second diaphragm and the housing.

13. An electronic device, characterized in that, The electronic device includes: A device housing, the device housing is provided with a receiving cavity; and The sound generating device according to any one of claims 1 to 12, the sound generating device is disposed in the receiving cavity and divides the receiving cavity into a mutually isolated front cavity and a rear cavity. The first side of the sound generating device communicates with the front cavity. Wherein, the device housing is provided with a sound outlet hole communicating with the front cavity, and sound waves on the first side of the first diaphragm and the second diaphragm of the sound generating device are radiated to the outside through the front cavity and the sound outlet hole.

14. The electronic device according to claim 13, wherein The device housing is further provided with a second leakage hole, and the second leakage hole communicates with the rear cavity; Wherein, the first diaphragm and the second diaphragm of the sound generating device radiate sound waves with a phase opposite to that of the sound waves in the front cavity to the rear cavity, and the sound waves in the rear cavity are radiated to the outside through the second leakage hole.

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