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 magnetic circuit system of the sound production device is provided with a through hole, a first vibrating diaphragm and a second vibrating diaphragm of a vibrating system are located on two opposite sides of the magnetic circuit system, the inner periphery of the second vibrating diaphragm is connected with the magnetic circuit system, and a first cavity is defined by the second vibrating diaphragm, a shell and the magnetic circuit system; the sound production device is provided with a first side of the second vibrating diaphragm back to the first vibrating diaphragm and a second side of the first vibrating diaphragm back to the second vibrating diaphragm, and sound waves of the first vibrating diaphragm and the second vibrating diaphragm facing the first side are jointly radiated to the first side; the shell is provided with a first leakage hole communicated with the first cavity and the outside, the first leakage hole penetrates through the surface, facing the second side, of the shell, and sound waves, facing the second side, of the second vibrating diaphragm and the first vibrating diaphragm are jointly radiated to the second side. According to the sound production device, the vibration area of the vibration system is increased, the performance and effect of the whole machine are improved, and the assembly difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducers, and in particular 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 single-body performance 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). Since the whole machine adopts a non-in-ear method to reflect the convenience and comfort of wearing, it is extremely urgent to improve the performance of the sound generating element.

[0003] The traditional Driver design is all single-sided vibration sound generation. In the limited cavity of the whole machine, it is very difficult to increase the vibration area and vibration displacement. Or in some double-sided diaphragm structures, the sound guiding channels are often arranged around the sound generating element, occupying a large radial size of the sound generating element, resulting in a reduction in the design space of the vibration system, and then a reduction in the vibration area. Therefore, the space for improving the performance of the sound generating element is also relatively limited, which cannot meet the requirements of existing wearable audio products such as OWS. Summary of the Invention

[0004] The main object 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. This sound generating device not only increases the effective vibration area, realizes the effective superposition of double-sided sound generation, but also reduces the assembly difficulty and improves the performance and effect of the whole machine.

[0005] To achieve the above object, the present invention provides 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 is provided with a first magnetic gap and a second magnetic gap arranged at intervals, and the second magnetic gap surrounds the first magnetic gap. The magnetic circuit system is further provided with a through hole, 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 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, so that the housing, the second diaphragm and the magnetic circuit system enclose a first cavity. The inner peripheral edge of the second diaphragm is provided with a first through hole communicating with the through hole. One end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap. One end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap;

[0009] Wherein, 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 first through hole, and jointly radiates to the first side with the sound wave of the second diaphragm facing the first side;

[0010] The housing is provided with a first leakage hole communicating the first cavity with the outside. The first leakage hole penetrates the surface of the housing facing the second side. The sound wave of the second diaphragm facing the second side is radiated outward through the first leakage hole and jointly radiates to the second side with the sound wave of the first diaphragm facing the second side.

[0011] In an embodiment, the magnetic circuit system includes a central magnetic part, an edge magnetic part, a magnetic yoke and a support. The central magnetic part and the magnetic yoke form a first magnetic gap. The edge magnetic part and the magnetic yoke form a second magnetic gap. The support is arranged on a side of the magnetic yoke facing away from the central magnetic part and encloses an air flow cavity with the magnetic yoke. The inner peripheral edge of the second diaphragm is connected to the support;

[0012] Wherein, the support is provided with a second through hole communicating the air flow cavity and the first through hole. The magnetic yoke is provided with a third through hole communicating the air flow cavity. The central magnetic part is provided with a fourth through hole corresponding to the third through hole. The fourth through hole, the third through hole and the second through hole form the through hole.

[0013] In an embodiment, the magnetic yoke is further provided with a fifth through hole communicating the first magnetic gap and the air flow cavity. The fifth through hole and the third through hole are spaced apart;

[0014] Among them, the sound waves of the first diaphragm facing the first side are radiated outward through the through hole and the first through hole, and at the same time are radiated outward through the first magnetic gap, the fifth through hole, the air flow cavity, the second through hole and the first through hole.

[0015] In an 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 periphery of the first bottom plate is connected to the housing. The central magnetic part is disposed on the first top plate and is spaced from the first side plate to enclose the first magnetic gap. The edge magnetic part is disposed on the first bottom plate and is spaced from the first side plate to enclose the second magnetic gap. The support member is disposed on a side of the first top plate facing away from the central magnetic part and encloses the air flow cavity with the first top plate. The first top plate is provided with the third through hole and the fifth through hole.

[0016] Among them, 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; and / or, the magnetic yoke is integrally stretched to form the first bottom plate, the first side plate and the first top plate connected in sequence.

[0017] In an embodiment, the magnetic circuit system includes a central magnetic part, an edge magnetic part, and a magnetic yoke connecting the central magnetic part and the edge magnetic part.

[0018] 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 disposed on the first top plate and is spaced from the first side plate to enclose the first magnetic gap. The edge magnetic part 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 through the central magnetic part and the first top plate.

[0019] Among them, the magnetic yoke further includes a support plate formed by bending and extending from 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 an end of the support plate away from the first top plate. The magnetic yoke is integrally stretched to form the first bottom plate, the first side plate, the first top plate and the support plate connected in sequence.

[0020] In one embodiment, the magnetic circuit system includes a central magnetic part, side magnetic parts, a ring magnet, a magnetic yoke, and a support. The magnetic yoke includes a first top plate and a first bottom plate provided at two ends of the ring magnet. The central magnetic part is provided on the first top plate and is spaced from the ring magnet to form the first magnetic gap. The side magnetic parts are provided on the first bottom plate and are spaced from the ring magnet to form the second magnetic gap. The support is provided on a side of the first top plate facing away from the central magnetic part and encloses with the first top plate to form an air flow chamber. The inner peripheral edge of the second diaphragm is connected to the support;

[0021] Wherein, the support is provided with a second through hole communicating the air flow chamber and the first through hole. The first top plate is provided with a third through hole communicating the air flow chamber. The central magnetic part is provided with a fourth through hole corresponding to the third through hole. The fourth through hole, the third through hole, and the second through hole form the through hole.

[0022] In one embodiment, the first top plate is further provided with a fifth through hole communicating the first magnetic gap and the air flow chamber. The fifth through hole is spaced from the third through hole. Wherein, the sound wave on the side of the first diaphragm facing the first side is radiated outward through the through hole and the first through hole, and is simultaneously radiated outward through the first magnetic gap, the fifth through hole, the air flow chamber, the second through hole, and the first through hole;

[0023] And / or, the first bottom plate is provided with an avoidance groove corresponding to the second magnetic gap for avoiding the second voice coil;

[0024] And / or, define the area of the first top plate as S1, and define the opening area of the third through hole as S2, S2 = (10% - 80%)S1;

[0025] And / or, the central magnetic part includes a central magnet and a central magnetic conductive plate stacked. The central magnet is connected to the first top plate, and the fourth through hole sequentially penetrates through the central magnetic conductive plate and the central magnet.

[0026] In one embodiment, the support includes a second top plate, a second side plate provided at 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 magnetic yoke facing away from the central magnetic part, so that the second top plate, the second side plate, and the magnetic yoke enclose to form the air flow chamber. The second top plate is provided with the second through hole. The inner peripheral edge of the second diaphragm is connected to a side of the second top plate facing away from the air flow chamber, so that the first through hole is communicated with the second through hole;

[0027] Wherein, there is one second through-hole, and the second through-hole is correspondingly communicated with the first 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.

[0028] In one embodiment, the housing includes a first housing and a second housing connected to each other. One end of the first housing away from the second housing is connected to the outer periphery of the first diaphragm, one side of the second housing facing away from the first housing is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the first housing;

[0029] Wherein, the first housing is provided with the first leakage hole, the first leakage hole penetrates through the surface of the first housing facing the second side, and the first leakage hole is located outside the first diaphragm.

[0030] In one embodiment, a support platform is convexly provided on the inner wall of the first housing. The outer periphery of the magnetic yoke and the outer periphery of the first diaphragm are respectively arranged on both sides of the support platform, and the first leakage hole is formed between the inner wall of the first housing and the support platform.

[0031] In one embodiment, the edge magnetic part includes a stacked 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, and a leakage channel communicating with the first leakage hole is formed between the edge magnetic plate and the second housing.

[0032] In one embodiment, the first diaphragm includes a surround portion and a dome. The surround portion surrounds the dome, the outer edge of the surround portion is connected to the housing, and the first voice coil is connected to the dome;

[0033] And / or, the second diaphragm includes an inner surround, a vibrating portion 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 first through-hole. The outer side of the outer surround is connected to the housing, and the second voice coil is connected to the vibrating portion; wherein, the second diaphragm further includes a vibrating plate, and the vibrating plate is arranged between the vibrating portion and the second voice coil.

[0034] In one embodiment, 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 into the front cavity, and radiate a second sound wave into the rear cavity. The first sound wave and the second sound wave are out of phase;

[0035] And / or, the second diaphragm is annular, an inner edge of the second diaphragm forms the first through hole, and the sound generating device further includes a first air-permeable member connected to the inner edge of the second diaphragm and covering the first through hole;

[0036] And / or, the sound generating device further includes a second air-permeable member covering the first leakage hole;

[0037] And / or, the sound generating device further includes a first positioning ring disposed between an outer peripheral edge of the first diaphragm and the housing;

[0038] And / or, the sound generating device further includes a second positioning ring disposed between an outer peripheral edge of the second diaphragm and the housing;

[0039] And / or, the sound generating device further includes a front cover, a periphery of the front cover is connected to the housing and is located on a side of the first diaphragm facing away from the second diaphragm. A second cavity is formed between the first diaphragm and the front cover, and the front cover is provided with a sixth through hole communicating the second cavity with the outside.

[0040] The present invention further provides an electronic device, which includes:

[0041] A device housing provided with a receiving cavity; and

[0042] The above-mentioned sound generating device disposed in the receiving cavity and dividing the receiving cavity into a mutually isolated front cavity and a rear cavity. A first side of the sound generating device communicates with the front cavity, and a second side of the sound generating device communicates with the rear cavity;

[0043] Wherein, the device housing is provided with a sound outlet hole communicating with the front cavity. 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, and sound waves of the first diaphragm and the second diaphragm of the sound generating device facing the second side are radiated into the rear cavity.

[0044] In one embodiment, the first diaphragm and the second diaphragm vibrate in the same direction, and sound waves of the first diaphragm and the second diaphragm facing the second side are out of phase with sound waves facing the first side;

[0045] The device housing is further provided with a second leakage hole communicating with the rear cavity, and sound waves of the first diaphragm and the second diaphragm facing the second side are radiated to the outside through the rear cavity and the second leakage hole.

[0046] The sound generating device of the technical solution of the present invention accommodates a magnetic circuit system and a vibration system in a housing, and a first magnetic gap and a second magnetic gap are provided on the magnetic circuit system, so that the second magnetic gap surrounds the first magnetic gap, and 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, and 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 current is 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. Not only can sound be generated by driving two voice coils to drive two diaphragms to vibrate through one magnetic circuit system, 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 is increased, so as to achieve the purpose of performance improvement; further, 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. By providing a through hole in the magnetic circuit system, connecting the inner peripheral edge of the second diaphragm to the magnetic circuit system, and providing a first through hole communicating with the through hole on the inner peripheral edge of the second diaphragm, the sound waves of the first diaphragm facing the first side are radiated to the outside through the through hole and the first through hole, and are radiated to the first side together with the sound waves of the second diaphragm facing the first side, which is beneficial to the superposition of the compressed air when the first diaphragm and the second diaphragm vibrate together towards the first side, improving the loudness and sensitivity of the sound generating device. And a first cavity is enclosed between the housing, the second diaphragm and the magnetic circuit system, and a first leakage hole communicating the first cavity with the outside is provided on the housing, so that the sound waves of the second diaphragm facing the second side are radiated to the outside through the first leakage hole, and are radiated to the second side together with the sound waves of the first diaphragm facing the second side, so as to realize the superposition of the compressed air when the first diaphragm and the second diaphragm deflate or vibrate together towards the second side, improving the loudness and sensitivity of the sound generating device and reducing the assembly difficulty and increasing the fitting degree of the whole machine assembly. Description of the Drawings

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description 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.

[0048] Figure 1 Schematic structural diagram of an embodiment of the sound generating device provided by the present invention;

[0049] Figure 2 Schematic structural diagram of another perspective of an embodiment of the sound generating device provided by the present invention;

[0050] Figure 3 Exploded view of an embodiment of the sound generating device provided by the present invention;

[0051] Figure 4 Cross-sectional view of an embodiment of the sound generating device provided by the present invention;

[0052] Figure 5 Cross-sectional view of another embodiment of the sound generating device provided by the present invention;

[0053] Figure 6 Cross-sectional view of yet another embodiment of the sound generating device provided by the present invention;

[0054] Figure 7 Partially enlarged cross-sectional view of still another embodiment of the sound generating device provided by the present invention;

[0055] Figure 8 Top view structural diagram of the sound generating device provided by the present invention with the front cover removed in an embodiment;

[0056] Figure 9 Exploded view of the housing of the sound generating device provided by the present invention in an embodiment;

[0057] Figure 10 Schematic structural diagram of the magnetic yoke of the sound generating device provided by the present invention in an embodiment;

[0058] Figure 11 Cross-sectional view of the magnetic yoke of the sound generating device provided by the present invention in an embodiment;

[0059] Figure 12 Cross-sectional view of the magnetic yoke of the sound generating device provided by the present invention in another embodiment;

[0060] Figure 13 Schematic structural diagram of the support member of the sound generating device provided by the present invention in an embodiment;

[0061] Figure 14Exploded schematic diagram of the connection between the magnetic yoke, the annular magnet and the support in an embodiment of the present invention;

[0062] Figure 15 Cross-sectional schematic diagram of the connection between the magnetic yoke, the annular magnet and the support in an embodiment of the present invention;

[0063] Figure 16 Structural schematic diagram of the front cover in an embodiment of the sound generating device provided by the present invention;

[0064] Figure 17 Structural schematic diagram of an embodiment of the electronic device provided by the present invention;

[0065] Figure 18 Cross-sectional schematic diagram of an embodiment of the electronic device provided by the present invention.

[0066] Explanation of the reference numerals in the drawings:

[0067] 100, sound generating device; 1, housing; 11, first housing; 111, first leakage hole; 112, support platform; 12, second housing; 121, leakage channel; 13, first cavity; 2, magnetic circuit system; 21, magnetic yoke; 211, first top plate; 2111, protruding portion; 2112, support portion; 2113, inclined surface; 2114, third through hole; 2115, fifth through hole; 2116, 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; 223, fourth through hole; 23, side magnetic part; 231, side magnet; 232, side magnetic guide plate; 24, support; 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; 28, annular magnet; 3, vibration system; 31, first diaphragm; 311, folding ring part; 312, dome; 32, second diaphragm; 321, inner folding ring; 322, vibration part; 323, outer folding ring; 324, first through hole; 325, vibration plate; 33, first voice coil; 34, second voice coil; 41, first positioning ring; 42, second positioning ring; 6, front cover; 61, second cavity; 62, sixth 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.

[0068] The realization of the purpose, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0069] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0070] It should be noted that all directional indications (such as up, down, left, right, front, back...) 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 indication will also change accordingly.

[0071] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes the scenario of A, or the scenario of B, or the scenario where A and B are satisfied simultaneously.

[0072] In addition, in the present invention, the descriptions such as "first", "second", etc. 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 such feature. 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 conflicts with each other 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.

[0073] In recent years, with the rapid development of consumer electronic products, electronic devices such as headphones, smartphones, 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.

[0074] The sound generating device is an important electro-acoustic transducer component in consumer electronic products and is widely used as a speaker, earpiece, headphone, 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 for OWS (Open Wearable Stereo) Bluetooth headphones are different from those of TWS (True Wireless Stereo). Since the whole machine is designed to reflect the convenience and comfort of wearing, the non-earplugged method is adopted, so the improvement of the performance of the sound generating device is extremely urgent.

[0075] Traditional Driver designs all use single-sided vibration for sound production. In the cavity of a whole machine with limited internal space, it is very difficult to increase the vibration area and vibration displacement in the design. Therefore, 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, in order 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 in the reliability of the product. At the same time, it is not conducive to the improvement of high-frequency performance, resulting in poor overall performance and effects of the whole machine.

[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, and the electronic device can be a mobile phone, an earphone, a smart wearable device, etc., which are not limited herein.

[0077] In this embodiment, the sound-producing device 100 of the present invention is provided with a double diaphragm and a double voice coil structure, and uses a magnetic circuit system 2 to drive two voice coils to drive two diaphragms to vibrate to achieve sound production. At the same time, double-sided diaphragm sound production is achieved 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 16As shown, 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 is provided with a first magnetic gap 25 and a second magnetic gap 26 that are spaced apart, and the second magnetic gap 26 surrounds the first magnetic gap 25. The magnetic circuit system 2 is further provided with a through hole 27, and the first magnetic gap 25 surrounds the through hole 27. The vibration system 3 includes a first diaphragm 31, a second diaphragm 32, a first voice coil 33, and a second voice coil 34. The first diaphragm 31 and the second diaphragm 32 are located on opposite sides of the magnetic circuit system 2. The outer peripheral edge of the first diaphragm 31 is connected to the housing 1 and is opposite to and spaced apart from the magnetic circuit system 2. The outer peripheral edge of the second diaphragm 32 is connected to the housing 1, and the inner peripheral edge of the second diaphragm 32 is connected to the magnetic circuit system 2, so that the housing 1, the second diaphragm 32, and the magnetic circuit system 2 enclose a first cavity 13. The inner peripheral edge of the second diaphragm 32 is provided with a first through hole 324 communicating with the through hole 27. One end of the first voice coil 33 is connected to the first diaphragm 31, and the other end of the first voice coil 33 is suspended in the first magnetic gap 25. One end of the second voice coil 34 is connected to the second diaphragm 32, and the other end of the second voice coil 34 is suspended in the second magnetic gap 26; wherein, 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 first through hole 324 and jointly radiate to the first side with the sound waves of the second diaphragm 32 facing the first side; the housing 1 is provided with a first leakage hole 111 communicating the first cavity 13 with the outside. The first leakage hole 111 penetrates the surface of the housing 1 facing the second side. The sound waves of the second diaphragm 32 facing the second side are radiated outward through the first leakage hole 111 and jointly radiate to the second side with the sound waves of the first diaphragm 31 facing the second 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 a structure formed by a combination of multiple split structures, which is not limited herein.

[0081] In this embodiment, the housing 1 can be optionally a box body or a frame structure, that is, the housing 1 has a cavity with two open ends. The magnetic circuit system 2 is received 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 peripheries of the first diaphragm 31 and the second diaphragm 32 are respectively connected to the two ends of the housing 1, thus forming a double-diaphragm structure. Therefore, two voice coils of the vibration system 3 are driven by one magnetic circuit system 2 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, and the first side and the second side can be understood in terms of orientation or direction. In this embodiment, as Figures 1 to 6 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, and the sound waves of the second diaphragm 32 facing the second side and the sound waves of the first diaphragm 31 facing the second side are radiated together to the second 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, thereby improving the sound generating effect and performance. In this embodiment, the first diaphragm 31 and the second diaphragm 32 can be optionally vibrated in the same direction and radiate sound waves with the same phase outward, so as to increase the volume of the sound generating device 100.

[0085] In this embodiment, the housing 1 is used to receive 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 peripheral contours of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are substantially aligned and 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 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, further facilitates assembly into the whole machine, and simplifies the reserved structure of the whole machine.

[0087] In this embodiment, as Figures 1 to 9 shown, the housing 1 includes a first housing 11 and a second housing 12 connected to each other. One side of the first housing 11 facing away from the second housing 12 is connected to the outer peripheral edge of the first diaphragm 31, and one end of the second housing 12 away from the first housing 11 is connected to the outside of the second diaphragm 32. The outer peripheral edge of the magnetic yoke 21 of the magnetic circuit system 2 is connected to one side of the first housing 11 facing away from the first diaphragm 31.

[0088] It can be understood that the first housing 11 and the second housing 12 of the housing 1 are optionally cylindrical, so that the first housing 11 and the second housing 12 are adaptively connected to form the cylindrical housing 1. By designing the housing 1 as a split first housing 11 and second housing 12, the first diaphragm 31 can be assembled through the first housing 11, and the second diaphragm 32 can be assembled through the second housing 12, which facilitates the assembly of the sound generating device 100 during the assembly process. In this embodiment, the first housing 11 and the second housing 12 of the 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 an external circuit, etc.

[0089] In one embodiment, the first housing 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, and the second housing 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 11 and the second housing 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 providing a first magnetic gap 25 and a second magnetic gap 26 on the magnetic circuit system 2, the second magnetic gap 26 is arranged to surround the first magnetic gap 25, so that the first voice coil 33 and the second voice coil 34 of the vibration system 3 respectively correspond to the first magnetic gap 25 and the second magnetic gap 26, and 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. Thus, when current is passed through the first voice coil 33 and the second voice coil 34, electrical energy is converted 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 enable 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 to radiate together to the first side, and the sound waves are superimposed and enhanced to improve the high-frequency performance. In this embodiment, a through hole 27 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 first 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 out through the through hole 27 and the first through hole 324, and radiate together to the first side with the sound waves on the first side of the second diaphragm 32.

[0094] In order to enable the sound waves on the second side of the second diaphragm 32 and the sound waves on the second side of the first diaphragm 31 to radiate together to the second side. In this embodiment, a first leakage hole 111 communicating the first cavity 13 with the outside is provided on the housing 1, and the sound waves on the second side of the second diaphragm 32 are radiated out through the first leakage hole 111 and radiate together to the second side with the sound waves on the second side of the first diaphragm 31.

[0095] 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. Thus, the sound waves on the second side of the second diaphragm 32 are radiated out through the first leakage hole 111 and radiate together to the second side with the sound waves on the second side of the first diaphragm 31. At the same time, it is convenient for the assembly of the sound generating device 100, and it can avoid the phenomenon of blocking the first leakage hole 111 due to insufficient radial dimension reserved for the whole machine during the assembly process. It is also convenient to set structures such as a breathable part at the first leakage hole 111, simplifying the assembly difficulty.

[0096] In this embodiment, the sound waves of the first diaphragm 31 facing the first side are radiated outward through the through hole 27 and the first through hole 324, and jointly radiate the first sound wave to the first side with the sound waves of the second diaphragm 32 facing the first side. The sound waves of the second diaphragm 32 facing the second side are radiated outward through the first leakage hole 111, and jointly radiate the second sound wave to the second side with the sound waves of the first diaphragm 31 facing the second side. Optionally, the phases of the first sound wave and the second sound wave are opposite.

[0097] The sound generating device 100 of the present invention houses a magnetic circuit system 2 and a vibration system 3 in a housing 1, and a first magnetic gap 25 and a second magnetic gap 26 are provided on the magnetic circuit system 2, such that the second magnetic gap 26 surrounds the first magnetic gap 25. The vibration system 3 is configured as a first diaphragm 31, a second diaphragm 32, a first voice coil 33 and a second voice coil 34. 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 sound be generated by driving two voice coils to drive two diaphragms to vibrate through one magnetic circuit system 2, but also the double-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, thereby achieving the purpose of performance improvement. Further, 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. By providing a through hole 27 in the magnetic circuit system 2, connecting the inner periphery of the second diaphragm 32 to the magnetic circuit system 2, and providing a first through hole 324 communicating with the through hole 27 at the inner periphery of the second diaphragm 32, the sound waves on the first side facing the first diaphragm 31 pass through the through hole 27 and the first through hole 324 and radiate outwards, and jointly radiate to the first side with the sound waves on the first side facing 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 towards the first side together, improving the loudness and sensitivity of the sound generating device 100. A first cavity 13 is formed by enclosing the housing 1, the second diaphragm 32 and the magnetic circuit system 2, and a first leakage hole 111 communicating the first cavity 13 with the outside is provided on the housing 1, such that the sound waves on the second side facing the second diaphragm 32 radiate outwards through the first leakage hole 111 and jointly radiate to the second side with the sound waves on the second side facing the first diaphragm 31, so as to achieve the superposition of the compressed air when the first diaphragm 31 and the second diaphragm 32 jointly release air towards the second side or vibrate, improving the loudness and sensitivity of the sound generating device 100 and reducing the assembly difficulty and increasing the adaptability of the overall machine assembly.

[0098] When the sound generating device 100 of the present application is actually applied, there can be various application environments. In one embodiment, the first diaphragm 31 and the second diaphragm 32 can be selected to vibrate in the same direction. The first side of the first diaphragm 31 and the second diaphragm 32 radiates a first sound wave to the external environment, and the second side of the first diaphragm 31 and the second diaphragm 32 radiates a second sound wave to the external environment. The first sound wave and the second sound wave are out of phase. In this way, both the first side and the second side of the sound generating device 100 communicate with the external environment, and the sound waves radiated from the first side and the second side to the external environment are sound waves with opposite phases, 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.

[0099] In one embodiment, the sound generating device 100 is applied to an electronic device 800 and is used to divide the space of the electronic device 800 into an acoustically isolated front cavity 740 and a rear cavity 750. The first side communicates with the front cavity 740, the second side communicates with the rear cavity 750, the first diaphragm 31 and the second diaphragm 32 vibrate in the same direction, and radiate a first sound wave to the front cavity 740 and a second sound wave to the rear cavity 750. The first sound wave and the second sound wave are out of phase.

[0100] It can be understood that the first side of the first diaphragm 31 and the second diaphragm 32 communicates with the front cavity, and the second side of the first diaphragm 31 and the second diaphragm 32 communicates with the rear cavity. The electronic device usually has a sound outlet hole for the sound wave in the front cavity to radiate out. When using the electronic device, the sound wave in the front cavity can be radiated out through the sound outlet hole and received by the user. Further, the sound wave in the rear cavity can optionally be radiated out through the rear leakage hole (the second leakage hole 730 in the present 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 wave in the rear cavity can not be radiated out, and the sound generating device of the present application only plays the role of enhancing the superposition of the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32, improving the high-frequency performance. It can be selected according to the actual situation.

[0101] In the first embodiment, the magnetic circuit system 2 includes a central magnetic part 22, an edge magnetic part 23, a magnetic yoke 21 and a support 24. The central magnetic part 22 and the magnetic yoke 21 form a first magnetic gap 25, the edge magnetic part 23 and the magnetic yoke 21 form a second magnetic gap 26. The support 24 is arranged on the side of the magnetic yoke 21 facing away from the central magnetic part 22 and encloses an air flow cavity 241 with the magnetic yoke 21. The inner periphery of the second diaphragm 32 is connected to the support 24. Among them, the support 24 is provided with a second through hole 2421 communicating the air flow cavity 241 and the first through hole 324, the magnetic yoke 21 is provided with a third through hole 2114 communicating the air flow cavity 241, and the central magnetic part 22 is provided with a fourth through hole 223 corresponding to the third through hole 2114. The fourth through hole 223, the third through hole 2114 and the second through hole 2421 form a through hole 27.

[0102] In this embodiment, as Figure 3 andFigure 4 As shown, by setting the magnetic circuit system 2 as the central magnetic part 22, the edge magnetic part 23, the magnetic yoke 21 and the support 24, by setting the support 24 and setting the magnetic yoke 21 as a positive and negative stretching structure, the connection area between the support 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.

[0103] It can be understood that by arranging the support 24 on the side of the magnetic yoke 21 facing away from the central magnetic part 22, the support 24 and the magnetic yoke 21 enclose an air flow cavity 241, a second through hole 2421 is arranged on the support 24, a third through hole 2114 is arranged on the magnetic yoke 21, and a fourth through hole 223 is arranged on the central magnetic part 22 corresponding to the third through hole 2114, so that the fourth through hole 223, the third through hole 2114, and the second through hole 2421 are sequentially communicated to form a through hole 27.

[0104] In this embodiment, by arranging the air flow cavity 241, the air flow area during the vibration of the first diaphragm 31 is effectively increased, so as to ensure smoother air flow, 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.

[0105] In an embodiment, the magnetic yoke 21 is further provided with a fifth through hole 2115 communicating the first magnetic gap 25 and the air flow cavity 241, and the fifth through hole 2115 and the third through hole 2114 are arranged at intervals; wherein, the sound waves on the first side facing the first diaphragm 31 are radiated outward through the through hole 27 and the first through hole 324, and at the same time are radiated outward through the first magnetic gap 25, the fifth through hole 2115, the air flow cavity 241, the second through hole 2421 and the first through hole 324.

[0106] In this embodiment, as Figures 3 to 5 、 Figure 15As 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 peripheral edge of the second diaphragm 32 is connected and fixed by the support member 24. At the same time, an air flow chamber 241 is formed by enclosing the support member 24 and the magnetic yoke 21. A fifth through hole 2115 communicating the first magnetic gap 25 and the air flow chamber 241 is provided on the magnetic yoke 21, and a second through hole 2421 communicating the air flow chamber 241 is provided on the support member 24. A first through hole 324 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 in sequence through the fifth through hole 2115, the air flow chamber 241, the second through hole 2421, and the first through hole 324. That is, the first magnetic gap 25, the fifth through hole 2115, the air flow chamber 241, the second through hole 2421, and the first through hole 324 are connected in sequence to form an air flow channel. And a through hole 27 communicating the air flow chamber 241 is provided in the magnetic circuit system 2, and the through hole 27 penetrates through the central magnetic part 22 and the magnetic yoke 21 in sequence. In this way, the sound waves on the first side of the first diaphragm 31 are radiated outward in sequence through the through hole 27, the air flow chamber 241, the second through hole 2421, and the first through hole 324. That is, the through hole 27, the air flow chamber 241, the second through hole 2421, and the first through hole 324 are connected in sequence to form another air flow channel. Thus, it is convenient for the sound waves on the first side of the first diaphragm 31 to be radiated outward to one side of the second diaphragm 32 through the two air flow channels. In this way, the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 are radiated outward 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, improving 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 fifth through hole 2115 of the magnetic yoke 21 and the through hole 27 of the magnetic circuit system 2 respectively cooperating with the air flow chamber 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, 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.

[0107] 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.

[0108] In one 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 periphery of 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 enclose 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 enclose a second magnetic gap 26. 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 an air flow chamber 241 with the first top plate 211. The first top plate 211 is provided with a third through hole 2114 and a fifth through hole 2115.

[0109] In this embodiment, as Figure 3 , Figure 4 , Figure 10 and Figure 11 shown, the magnetic yoke 21 can be selected as an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form the first bottom plate 212, the first side plate 213, and the first top plate 211 connected in sequence. In this way, the structural strength of the magnetic yoke 21 can be improved, 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, and 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, is connected to the first top plate 211, and is 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 side 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 side magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213.

[0110] It can be understood that the through hole 27 penetrates through the central magnetic part 22 and the first top plate 211 in sequence. In this embodiment, the first top plate 211 is provided with a third through hole 2114 and a fifth through hole 2115.

[0111] 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. 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.

[0112] In this embodiment, as Figures 3 to 5 , Figure 14 andFigure 15 As shown, the support member 24 is provided on the side of the first top plate 211 of the magnetic yoke 21 facing away from the central magnetic portion 22, and encloses an air flow chamber 241 with the first top plate 211. The first top plate 211 is provided with a fifth through hole 2115 communicating the air flow chamber 241 and the first magnetic gap 25.

[0113] It can be understood that the number of the fifth through holes 2115 is one or more. In order to keep the air flow smooth and ensure the vibration balance of the first diaphragm 31, the number of the fifth through holes 2115 is at least 2. In specific applications, different numbers of the fifth through holes 2115 are set according to needs, and the fifth through holes 2115 are arranged at intervals. Optionally, the fifth through holes 2115 include a plurality of them, and the plurality of fifth through holes 2115 are arranged at intervals. In this embodiment, the plurality of fifth through holes 2115 are arranged around the central magnetic portion 22 and are evenly and spacedly arranged.

[0114] In the second embodiment, the magnetic circuit system 2 includes a central magnetic portion 22, a side magnetic portion 23, and a magnetic yoke 21 connecting the central magnetic portion 22 and the side magnetic portion 23; 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 portion 22 is provided on the first top plate 211 and is spaced from the first side plate 213 to enclose a first magnetic gap 25. The side magnetic portion 23 is provided 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 the central magnetic portion 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 portion 22. 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. The magnetic yoke 21 is integrally stretched to form the first bottom plate 212, the first side plate 213, the first top plate 211, and the support plate 214 connected in sequence.

[0115] In this embodiment, as Figure 6 and Figure 12 shown, the magnetic yoke 21 can be selected as an integrally formed structure, that is, the magnetic yoke 21 is integrally stretched to form the first bottom plate 212, the first side plate 213, the first top plate 211, and the 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.

[0116] 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, is connected to the first top plate 211, and is 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 side 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 side magnetic part 23 and the central magnetic part 22 are located on opposite sides of the first side plate 213.

[0117] 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, there is a height difference between the first top plate 211 and the first bottom plate 212 in the vibration direction of the vibration system 3, so as to ensure that the size of the magnetic circuit system 2 along the vibration direction of the vibration system 3 is not too large, thereby realizing a thin and light design.

[0118] In this embodiment, as Figure 6 and Figure 12 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 through the support plate 214.

[0119] 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 the first bottom plate 212, the first side plate 213 and the first top plate 211. By additionally providing the support member 24, the second diaphragm 32 and the central magnetic part 22 are respectively fixed by the support member 24 and the first top plate 211 of the magnetic yoke 21. And by forming an air flow cavity 241 between the support member 24 and the first top plate 211, and providing a fifth through hole 2115 communicating with the air flow cavity 241 on the first top plate 211, the air flow on the first side of the first diaphragm 31 can be radiated outward through two channels, so as to ensure the smooth air flow of 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 the second embodiment, the magnetic yoke 21 is integrally stretched to form the first bottom plate 212, the first side plate 213, the first top plate 211 and the support plate 214, and the second diaphragm 32 and the central magnetic part 22 are respectively fixed by the support plate 214 and the first top plate 211 to ensure the connection stability.

[0120] In the third embodiment, the magnetic circuit system 2 includes a central magnetic part 22, side magnetic parts 23, an annular magnet 28, a magnetic yoke 21 and a support member 24. The magnetic yoke 21 includes a first top plate 211 and a first bottom plate 212 provided at both ends of the annular magnet 28. The central magnetic part 22 is provided on the first top plate 211 and is spaced from the annular magnet 28 to form a first magnetic gap 25. The side magnetic parts 23 are provided on the first bottom plate 212 and are spaced from the annular magnet 28 to form a second magnetic gap 26. The support member 24 is provided 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 chamber 241. The inner peripheral edge of the second diaphragm 32 is connected to the support member 24. Among them, the support member 24 is provided with a second through hole 2421 communicating the air flow chamber 241 and the first through hole 324. The first top plate 211 is provided with a third through hole 2114 communicating the air flow chamber 241. The central magnetic part 22 is provided with a fourth through hole 223 corresponding to the third through hole 2114. The fourth through hole 223, the third through hole 2114 and the second through hole 2421 form a through hole 27.

[0121] In this embodiment, as Figure 5 , Figure 14 and Figure 15 shown, by setting the magnetic circuit system 2 as the central magnetic part 22, side magnetic parts 23, annular magnet 28, magnetic yoke 21 and support member 24, by providing the support member 24 and setting the magnetic yoke 21 as a split structure, the support member 24 is provided on the side of the first top plate 211 of the magnetic yoke 21 facing away from the central magnetic part 22, thereby increasing 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, improving the stability while reducing the reliability risk.

[0122] It can be understood that by providing the support member 24 on the side of the first top plate 211 facing away from the central magnetic part 22, an air flow chamber 241 is enclosed between the support member 24 and the first top plate 211 of the magnetic yoke 21. A second through hole 2421 is provided in the support member 24, a third through hole 2114 is provided in the first top plate 211 of the magnetic yoke 21, and the central magnetic part 22 is provided with a fourth through hole 223 corresponding to the third through hole 2114. In this way, the fourth through hole 223, the third through hole 2114 and the second through hole 2421 are sequentially connected to form a through hole 27. By providing the air flow chamber 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.

[0123] In this embodiment, as Figure 5 , Figure 14 and Figure 15As shown, by setting the magnetic yoke 21 as a split structure, the first top plate 211 and the first bottom plate 212 of the magnetic yoke 21 are located in different planes along the vibration direction of the vibration system 3, and an annular magnet 28 is provided such that the first top plate 211 and the first bottom plate 212 of the magnetic yoke 21 are respectively connected to both ends of the annular magnet 28. That is, the annular magnet 28 is optionally disposed around the periphery of the first top plate 211 and is disposed at an angle with the first top plate 211, and an accommodation cavity is formed by enclosing the annular magnet 28 and the first top plate 211. The central magnetic part 22 is disposed in the accommodation cavity, is connected to the first top plate 211, and is spaced from the annular magnet 28 to enclose a first magnetic gap 25. The first bottom plate 212 is optionally connected to one end of the annular magnet 28 away from the first top plate 211, and the first bottom plate 212 extends in a direction away from the accommodation cavity and is disposed at an angle with the annular magnet 28. The side magnetic part 23 is disposed on the first bottom plate 212 and is spaced from the annular magnet 28 to enclose a second magnetic gap 26. That is, the side magnetic part 23 and the central magnetic part 22 are located on opposite sides of the annular magnet 28.

[0124] It can be understood that in this way, the first magnetic gap 25 and the second magnetic gap 26 located on opposite sides of the annular magnet 28 can be formed by the cooperation of the annular magnet 28 with the side magnetic part 23 and the central magnetic part 22 respectively, thereby increasing the magnet volume of the magnetic circuit system 2, improving the magnetic field strength, and effectively enhancing the driving force of the first magnetic gap 25 and the second magnetic gap 26 on the first voice coil 33 and the second voice coil 34, and improving the BL value.

[0125] Optionally, the annular magnet 28 extends along the vibration direction of the vibration system 3, and the first top plate 211 and the first bottom plate 212 are connected to both ends of the annular magnet 28 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, so as to ensure 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.

[0126] In an embodiment, the first top plate 211 is further provided with a fifth through hole 2115 communicating the first magnetic gap 25 and the air flow cavity 241, and the fifth through hole 2115 is spaced from the third through hole 2114; wherein, the sound waves on the side of the first diaphragm 31 facing the first side are radiated outward through the through hole 27 and the first through hole 324, and at the same time are radiated outward through the first magnetic gap 25, the fifth through hole 2115, the air flow cavity 241, the second through hole 2421 and the first through hole 324.

[0127] In this embodiment, as Figures 3 to 5 、 Figure 10 、 Figure 11 、 Figure 14 and Figure 15As shown, a fifth through-hole 2115 communicating with the first magnetic gap 25 and the air flow chamber 241 is provided on the first top plate 211 of the magnetic yoke 21, a second through-hole 2421 communicating with the air flow chamber 241 is provided on the support member 24, and a first through-hole 324 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 pass through the fifth through-hole 2115, the air flow chamber 241, the second through-hole 2421, and the first through-hole 324 in sequence and radiate outward. That is, the first magnetic gap 25, the fifth through-hole 2115, the air flow chamber 241, the second through-hole 2421, and the first through-hole 324 are connected in sequence to form an air flow channel. And a through-hole 27 communicating with the air flow chamber 241 is provided in the magnetic circuit system 2, and the through-hole 27 penetrates through the central magnetic part 22 and the first top plate 211 of the magnetic yoke 21 in sequence. In this way, the sound waves on the first side of the first diaphragm 31 pass through the through-hole 27, the air flow chamber 241, the second through-hole 2421, and the first through-hole 324 in sequence and radiate outward. That is, the through-hole 27, the air flow chamber 241, the second through-hole 2421, and the first through-hole 324 are connected in sequence 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 outward to one side of the second diaphragm 32 through the two air flow channels. In this way, the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 are radiated outward 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, improving 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 using the first top plate 211 of the support member 24 and the magnetic yoke 21 to improve the installation stability, thereby reducing the reliability risk. And through the fifth through-hole 2115 of the first top plate 211 and the through-hole 27 of the magnetic circuit system 2, respectively cooperating with the air flow chamber 241 formed by the first top plate 211 and the support member 24, the air flow circulation area when the first diaphragm 31 vibrates is effectively increased, so as to ensure that the air flow circulates more smoothly, 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.

[0128] In this embodiment, the first top plate 211 of 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 first top plate 211 of 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 first top plate 211 of the magnetic yoke 21 can be integrally injection molded, which is not limited herein.

[0129] It should be noted that the difference between the third 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. In the third embodiment, the magnetic yoke 21 is a split structure, and the first top plate 211 and the first bottom plate 212 of the magnetic yoke 21 are respectively connected to both ends of the annular magnet 28.

[0130] In an embodiment, define the area of the first top plate 211 as S1, and define the opening area of the third through hole 2114 as S2, S2=(10% - 80%)S1.

[0131] In this embodiment, by controlling the opening area of the third 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 it can also ensure the structural strength of the magnetic yoke 21 and the connection area between the central magnetic part 22 and the first top plate 211, thereby improving stability. Optionally, the opening area S2 of the third through hole 2114 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 here.

[0132] It can be understood that if the opening area of the third through hole 2114 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 third 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.

[0133] It should be noted that the opening area of the fifth through hole 2115 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 fifth through hole 2115 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 fifth through hole 2115 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.

[0134] It can be understood that by controlling the opening area of the fifth through hole 2115 on the first top plate 211, 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 magnetic yoke 21 and the connection area between the central magnetic part 22 and the first top plate 211, thereby improving stability.

[0135] It should be noted that when there is one fifth through hole 2115, the opening area of the fifth through hole 2115 is the opening area of one fifth through hole 2115. When there are multiple fifth through holes 2115, the opening area of the fifth through hole 2115 is the sum of the opening areas of multiple fifth through holes 2115.

[0136] Optionally, the opening area of the fifth through-hole 2115 accounts for 10% to 80% of the area of the first top plate 211. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., which are not limited herein.

[0137] In this embodiment, as Figures 3 to 6 shown, the through-hole 27 sequentially penetrates through the central magnetic portion 22 and the first top plate 211. The central magnetic portion 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.

[0138] It can be understood that the central magnetic conductive plate 222 of the central magnetic portion 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 fourth through-hole 223, and the first top plate 211 is provided with a third through-hole 2114, so that the first through-hole, the second through-hole (i.e., the fourth through-hole 223), and the third through-hole 2114 are sequentially correspondingly connected to form the through-hole 27.

[0139] Optionally, the first through-hole, the second through-hole, and the third through-hole 2114 are coaxially arranged along the vibration direction of the vibration system 3.

[0140] In this embodiment, the fifth through-hole 2115 of the first top plate 211 is spaced from the third through-hole 2114. Optionally, there are a plurality of fifth through-holes 2115, and the plurality of fifth through-holes 2115 are spaced and arranged around the third through-hole 2114, which are not limited herein.

[0141] In order to further ensure the smoothness 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 portion 2111 and a support portion 2112 connected to each other. The convex portion 2111 protrudes from the first top plate 211 toward the central magnetic portion 22, so that the support portion 2112 surrounds the convex portion 2111; wherein, the support portion 2112 is provided with a fifth through-hole 2115, the central magnetic portion 22 is disposed on the convex portion 2111, and is spaced from the support portion 2112 to enclose an air flow channel 2116. The air flow channel 2116 communicates with the first magnetic gap 25 and the fifth through-hole 2115. The support member 24 is connected to the side of the support portion 2112 facing away from the air flow channel 2116. The third through-hole 2114 penetrates through the convex portion 2111, that is, the through-hole 27 sequentially penetrates through the central magnetic portion 22 and the convex portion 2111.

[0142] In this embodiment, as Figures 3 to 5 、 Figure 10 、 Figure 11 、Figure 14 and Figure 15 As shown in Figure 15 , by providing a protruding portion 2111 protruding toward the central magnetic portion 22 on the first top plate 211 of the magnetic yoke 21, 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 2116, and a fifth through hole 2115 is provided in the support portion 2112. Thus, by using the air flow channel 2116 to communicate the first magnetic gap 25 and the fifth through hole 2115, it is possible to ensure the smooth flow of the air flow below the first diaphragm 31, improve the high-frequency performance of the first diaphragm 31, and at the same time ensure the magnet volume of the central magnetic portion 22, thereby ensuring the magnetic field strength.

[0143] 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 provided around the protruding portion 2111. Thus, a plurality of fifth through holes 2115 can be provided to ensure the smooth flow of the 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 third through hole 2114.

[0144] In this embodiment, as Figures 3 to 5 , Figure 10 , Figure 11 , Figure 14 and Figure 15 shown, an inclined surface 2113 is formed at the connection between the protruding portion 2111 and the support portion 2112, and the fifth through hole 2115 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 toward 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 herein.

[0145] It can be understood that by providing the fifth through hole 2115 to sequentially penetrate the support portion 2112 and the inclined surface 2113, the opening area of the fifth through hole 2115 is further increased, ensuring the smooth flow of the air flow below the first diaphragm 31, improving the high-frequency performance of the first diaphragm 31, and at the same time ensuring the magnet volume of the central magnetic portion 22, thereby ensuring the magnetic field strength. Optionally, the fifth through hole 2115 includes a plurality of them, and the plurality of fifth through holes 2115 are spaced apart and provided around the protruding portion 2111.

[0146] 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 fifth through hole 2115, the fifth through hole 2115 can be selected as an arc-shaped hole extending along the periphery of the protruding portion 2111.

[0147] In one embodiment, the side of the supporting portion 2112 facing the support member 24 is recessed toward the air flow channel 2116 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 toward the air flow channel 2116 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.

[0148] 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 an 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, thus improving the performance of the sound generating device 100.

[0149] In one embodiment, as Figures 3 to 6 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 sandwiched 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 both spaced from the first side plate 213 of the magnetic yoke 21 or the annular magnet 28 to form a first magnetic gap 25.

[0150] 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.

[0151] 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 fourth through hole 223 sequentially penetrates through 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 through the central magnetic conductive plate 222, the central magnet 221, and the protruding portion 2111.

[0152] In one embodiment, as Figures 3 to 6 shown, the side magnetic portion 23 includes a side magnet 231 and a side magnetic conductive plate 232 stacked on top of each other, and the side magnet 231 is connected to the magnetic yoke 21. It can be understood that the side magnet 231 is connected to the first bottom plate 212 of the magnetic yoke 21, that is, the side magnet 231 is sandwiched between the first bottom plate 212 and the side magnetic conductive plate 232, and the inner peripheral edges of the side magnet 231 and the side magnetic conductive plate 232 are both spaced from the first side plate 213 of the magnetic yoke 21 or the annular magnet 28 to form a second magnetic gap 26. Optionally, the side magnet 231 and the side magnetic conductive plate 232 of the side magnetic portion 23 can be ring-shaped structures, which are not limited herein.

[0153] In order to further improve the connection stability, in this embodiment, the side magnetic conductive plate 232 and the housing 1 are of 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 side magnetic conductive plate 232 are integrally processed and formed, 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 side magnetic conductive plate 232 can be integrally injection molded, which is not limited herein.

[0154] Optionally, the side magnetic conductive plate 232 and the second housing 12 of the housing 1 are of an integrally formed structure, which is not limited herein. In this embodiment, the side magnetic conductive plate 232 is injection molded on the housing 1, and the first leakage hole 111 is formed by removing material from the side magnetic conductive plate 232 and / or the corresponding housing 1 area. It can be understood that by removing material from the side magnetic conductive plate 232 or the housing 1 or both the side magnetic conductive 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.

[0155] In an embodiment, the support member 24 includes a second top plate 242, a second side plate 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 plate 243 away from the second top plate 242. The second bottom plate 244 is connected to the side of the magnetic yoke 21 facing away from the central magnetic portion 22, so that the second top plate 242, the second side plate 243, and the magnetic yoke 21 enclose an air flow cavity 241. The second top plate 242 is provided with a second through hole 2421, and the inner periphery of the second diaphragm 32 is connected to the side of the second top plate 242 facing away from the air flow cavity 241, so that the first through hole 324 is communicated with the second through hole 2421.

[0156] In this embodiment, as Figures 3 to 5 、 Figures 13 to 15 shown, the support member 24 can be of an integrally formed structure. The second side plate 243 is provided on the periphery of the second top plate 242 and is disposed 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 disposed at an angle with the second side plate 243. In this way, the support member 24 is connected to the magnetic yoke 21 by using the second bottom plate 244, thereby increasing the contact area and improving the connection stability. Moreover, the first top plate 211 of the magnetic yoke 21 is supported away from the second top plate 242 by the second side plate 243 of the support member 24, so that the second top plate 242, the second side plate 243, and the first top plate 211 of the magnetic yoke 21 enclose the air flow cavity 241, and the inner periphery of the second diaphragm 32 is fixed by the second top plate 242 of the support member 24.

[0157] Optionally, the support member 24 is a metal member, 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.

[0158] 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 chamber 241 communicates with the outside through the second through hole 2421 and the first through hole 324 of the second diaphragm 32. In this embodiment, the first through hole 324 of the second diaphragm 32 can be one or more. When the first through hole 324 is one, that is, the second diaphragm 32 is an annular diaphragm, at this time, the inner peripheral edge of the second diaphragm 32 forms the first through hole 324, that is, the second through hole 2421 of the second top plate 242 is located within the projection range of the first through hole 324 on the second top plate 242. When the first through hole 324 is multiple, at this time, the inner side of the second diaphragm 32 is flat and is adhesively connected to the second top plate 242. The inner side of the second diaphragm 32 is provided with multiple first through holes 324, and at least part of the multiple first through holes 324 corresponds to and communicates with the second through hole 2421, which is not limited herein.

[0159] Optionally, the second through hole 2421 is one, and the second through hole 2421 corresponds to and communicates with the first through hole 324; or, the second through hole 2421 includes multiple, and the multiple second through holes 2421 are arranged at intervals.

[0160] 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 first through holes 324, optionally, the multiple second through holes 2421 are arranged in one-to-one correspondence with the multiple first through holes 324, which is not limited herein.

[0161] In an embodiment, define the area of the second top plate 242 as S3, and define the opening area of the second through hole 2421 as S4, S4=(10% - 80%)S3.

[0162] 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 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 is not limited herein.

[0163] It is understandable 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.

[0164] 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-holes 2421 is the sum of the opening areas of multiple second through-holes 2421.

[0165] In an embodiment, the second diaphragm 32 is annular, the inner edge of the second diaphragm 32 forms a first through-hole 324, and the sound generating device 100 further includes a first air-permeable member, and the first air-permeable member is connected to the inner edge of the second diaphragm 32 and covers the first through-hole 324.

[0166] In this embodiment, as Figures 3 to 6 shown, the second diaphragm 32 can be selected as an annular diaphragm. At this time, the inner edge of the second diaphragm 32 forms a first through-hole 324, that is, the inner edge of the second diaphragm 32 forms a first through-hole 324. It is understandable that by providing the first air-permeable member, the first air-permeable member is connected to the inner edge of the second diaphragm 32 and covers the first through-hole 324, so as to prevent external dust or impurities from entering the interior of the sound generating device 100 by using the first air-permeable member, thereby avoiding affecting the acoustic performance of the sound generating device 100.

[0167] In an embodiment, a first cavity 13 is formed between the second diaphragm 32, the housing 1, and the magnetic circuit system 2, and the sound generating device 100 is provided with a first leakage hole 111 communicating the first cavity 13 with the outside. Optionally, the sound generating device 100 further includes a second air-permeable member, and the second air-permeable member covers the first leakage hole 111.

[0168] It should be noted that in the first embodiment, as Figure 4 shown, a first cavity 13 is formed between the second diaphragm 32, the housing 1, the magnetic yoke 21, and the support member 24; in the second embodiment, as Figure 6 shown, a first cavity 13 is formed between the second diaphragm 32, the housing 1, and the magnetic yoke 21; in the third embodiment, as Figure 5 shown, a first cavity 13 is formed between the second diaphragm 32, the housing 1, the annular magnet 28, the magnetic yoke 21, and the support member 24.

[0169] In this embodiment, as Figures 4 to 6As shown, the first cavity 13 can be an optional 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.

[0170] 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.

[0171] In this embodiment, by providing a second air-permeable member on the first leakage hole 111 and using the second air-permeable member to cover the first leakage hole 111, on the one hand, it can prevent external dust or impurities from entering the interior of the sound generating device 100, thereby avoiding affecting the acoustic performance of the sound generating device 100; 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.

[0172] 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 peripheral edge 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 peripheral edge of the second diaphragm 32. The outer peripheral edge of the magnetic yoke 21 is connected to the first housing 11, that is, the outer peripheral edge of the first bottom plate 212 is connected to the first housing 11.

[0173] Optionally, the first housing 11 is provided with a first leakage hole 111. The first leakage hole 111 penetrates through the surface of the first housing 11 facing the second side, and the first leakage hole 111 is located outside the first diaphragm 31. 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 realize 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, and reduce the assembly difficulty and increase the adaptability of the overall machine assembly.

[0174] 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; or, the first leakage hole 111 is formed at the connection between the first housing 11 and the second housing 12, which is not limited here.

[0175] It can be understood that by providing the first leakage hole 111 and arranging a second air-permeable member at the first leakage hole 111, 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.

[0176] In one 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, and a first leakage hole 111 is formed between the inner wall of the first housing 11 and the support platform 112.

[0177] In this embodiment, as Figures 3 to 7 、 Figure 9 shown, by providing the support platform 112 on the inner wall of the first housing 11 of the outer shell 1, the outer peripheral edge of the magnetic yoke 21 and the outer peripheral edge of the first diaphragm 31 can be 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.

[0178] It can be understood that the 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 through 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 second 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.

[0179] In one embodiment, the edge magnetic part 23 includes a stacked edge magnet 231 and an edge magnetic guide plate 232. The edge magnet 231 is connected to the magnetic yoke 21, the edge 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 edge magnetic guide plate 232 and the second housing 12.

[0180] In this embodiment, the edge magnetic guide plate 232 and the second housing 12 can be an integrally formed structure. 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, so that the processing steps and assembly steps can be simplified. Of course, in other embodiments, the edge magnetic guide plate 232 and the second housing 12 are adhesively connected, that is, the outer peripheral edge of the magnetic yoke 21 and the first housing 11 can also be adhesively connected. As Figures 4 to 7 shown, the outer peripheral edge of the magnetic yoke 21 is adhesively connected to the support platform 112.

[0181] It can be understood that by forming a leakage channel 121 between the edge magnetic conduction plate 232 of the edge magnetic part 23 and the second housing 12, the first cavity 13 can be communicated with the first leakage hole 111 through the leakage channel 121, so as to ensure the smooth flow of the air flow in the first cavity 13, and ensure that both the first leakage hole 111 and the first diaphragm 31 are located on the second side of the sound generating device 100, which is beneficial to simplify the assembly difficulty and enable the first diaphragm 31 to avoid the first leakage hole 111 of the first housing 11.

[0182] In an embodiment, the first diaphragm 31 includes a surround portion 311 and a dome 312. The surround portion 311 is disposed around the dome 312. The outer edge of the surround portion 311 is connected to the housing 1, and the first voice coil 33 is connected to the dome 312.

[0183] In this embodiment, as Figures 3 to 8 shown, the surround portion 311 and the dome 312 of the first diaphragm 31 may be an integrally formed structure or a split structure, which is not limited herein. It can be understood that the surround portion 311 of the first diaphragm 31 is a convex structure protruding upward or a concave structure recessed downward, which is not limited herein. Optionally, the surround portion 311 protrudes in a direction away from the magnetic circuit system 2.

[0184] It can be understood that the outer edge of the surround portion 311 is connected to the housing 1, and the first voice coil 33 is connected to the dome 312. When the first voice coil 33 vibrates, it drives the first diaphragm 31 to vibrate, so that the sound wave of the first diaphragm 31 radiates outward along the through hole 27 and the first through hole 324; or, the sound wave of the first diaphragm 31 radiates outward along the first magnetic gap 25, the air flow channel 2116, the fifth through hole 2115, the air cavity 241, the second through hole 2421, the first through hole 324, and at the same time radiates outward along the through hole 27, the air cavity 241, the second through hole 2421, the first through hole 324, which is not limited herein.

[0185] In an embodiment, the outer contour of the dome 312 is circular, and the through hole 27 is a circular hole. Define the diameter of the dome 312 as D1, and define the diameter of the through hole 27 as D2, D2≥0.3D1. It can be understood that the diameter size of the dome 312 and the diameter size of 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.

[0186] In order to ensure the smooth transmission of sound waves from the first diaphragm 31, in another embodiment, the projected area of the through-hole 27 along the vibration direction of the vibration system is defined as S5, and the projected area of the dome 312 along the vibration direction of the vibration system is defined as S6, where S5 ≥ 8.5% * S6. It can be understood that through the above design method of the projected area, the smooth transmission of sound waves from the first diaphragm 31 can be ensured, and the air flow sound can be reduced. In practical applications, a suitable structural design can be selected according to specific requirements to meet the smooth transmission of sound waves from the first diaphragm 31 and reduce the air flow sound, which is not limited here.

[0187] In one embodiment, the outer peripheral edge of the first diaphragm 31 includes at least one straight edge and at least one arc edge, and the straight edge is connected to the arc edge so that the outer contour of the first diaphragm 31 is non-circular.

[0188] In this embodiment, the outer peripheral edge of the surround portion 311 of the first diaphragm 31 includes at least one straight edge and at least one arc edge, and the straight edge is connected to the arc edge. Optionally, the outer contour of the dome 312 is similar to the outer contour of the surround portion 311, which is not limited here.

[0189] Optionally, 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 of the first diaphragm 31 is correspondingly connected to the straight edge portion of the housing 1, and the arc edge of the first diaphragm 31 is correspondingly connected to the arc portion of the housing 1.

[0190] It can be understood that when the first leakage hole 111 penetrates the surface of the housing 1 facing the second side, the first leakage hole 111 corresponds to the straight edge 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 of the first diaphragm 31. In this way, the straight edge portion of the housing 1 and the straight edge of the first diaphragm 31 can be used to avoid the first leakage hole 111.

[0191] In one embodiment, the outer peripheral edge of the first diaphragm 31 includes one straight edge and one arc edge, and the straight edge is connected to the arc edge. The first diaphragm 31 is symmetrically arranged along the center line of the straight edge.

[0192] In another embodiment, the outer peripheral edge of the first diaphragm 31 includes two straight edges and two arc edges. The two ends of each straight edge are respectively connected to one end of the two arc edges, and the two ends of each arc edge are respectively connected to one end of the two straight edges; among them, the two straight edges are symmetrically arranged, and the two arc edges are symmetrically arranged.

[0193] In one embodiment, as Figure 1 、 Figures 3 to 6As shown, the second diaphragm 32 includes an inner folding ring 321, a vibrating portion 322, and an outer folding ring 323 that are connected in sequence. The inner peripheral edge of the inner folding ring 321 is connected to the magnetic circuit system 2 and is provided with a first through hole 324. The outer side of the outer folding ring 323 is connected to the housing 1, and the second voice coil 34 is connected to the vibrating portion 322. Among them, 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.

[0194] It can be understood that by setting the second diaphragm 32 as a double folding ring structure, it is convenient for the second voice coil 34 to drive the second diaphragm 32 to vibrate while improving the compliance of the second diaphragm 32 and enhancing its high-frequency performance. The inner side of the inner folding ring 321 of the second diaphragm 32 can be an annular structure or a flat plate structure. When the inner side of the inner folding ring 321 is an annular structure, a first through hole 324 is formed on the inner side of the inner folding ring 321; when the inner side of the inner folding ring 321 is a flat plate structure, the flat plate structure is provided with a first through hole 324, which is not limited here.

[0195] 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 here. 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 from the support member 24 when the second diaphragm 32 vibrates. 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.

[0196] 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, which can simplify the processing steps of the second diaphragm 32 and improve the structural strength of the second diaphragm 32.

[0197] In an embodiment, as Figures 3 to 6 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.

[0198] In an embodiment, as Figures 3 to 7 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 folding 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 enhanced.

[0199] In an embodiment, asFigures 3 to 6 As shown, the sound generating device 100 further includes a second positioning ring 42, which is disposed between the outer peripheral edge of the second diaphragm 32 and the housing 1. Optionally, the second positioning ring 42 may be a steel ring. By using the second positioning ring 42 between the outer peripheral edge of the outer folding 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 enhanced.

[0200] 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. A second cavity 61 is formed between the first diaphragm 31 and the front cover 6. The front cover 6 is provided with a sixth through hole 62 communicating the second cavity 61 and the outside.

[0201] In this embodiment, as Figures 2 to 7 、 Figure 16 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, the 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 the sixth through hole 62 communicating the second cavity 61 and the outside on the front cover 6, the sound wave on the side of the first diaphragm 31 facing the second side can be radiated outward through the sixth through hole 62. Optionally, the outer peripheral edge contour of the front cover 6 is similar to the outer peripheral edge contour of the first diaphragm 31.

[0202] Optionally, the front cover 6 is a metal part formed by processing a metal material, which is convenient to strongly support the sound generating device 100 during the assembly process of the sound generating device 100 and at the same time reduces the occupation of the overall size of the machine. In a specific application, a suitable number of sixth 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 or the like is provided on the sixth through hole 62, which can further adjust the air flow rate in the second cavity 61 and adjust the acoustic resistance of the second cavity 61.

[0203] In an embodiment, as Figures 2 to 5 shown, one end of the housing 1 facing away from the second diaphragm 32 is further provided with a support boss and a retaining wall connected to the support boss. 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, and the surface of the retaining wall 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 the sixth through hole 62.

[0204] It can be understood that by providing the supporting bosses and retaining walls on the outer shell 1, the front cover 6 can be supported and fixed by the supporting bosses and retaining walls, and at the same time, the front cover 6 can be positioned and installed. Optionally, the top cover portion 63, the side plate portion 64 and the edge portion 65 of the front cover 6 are integrally formed structures. The front cover 6 is connected to the 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.

[0205] In another embodiment, as Figure 6 , Figure 7 and Figure 16 shown, the front cover 6 includes a top cover portion 63, a side plate portion 64 provided at the periphery of the top cover portion 63, an edge portion 65 extending outward from one end of the side plate portion 64 away from the top cover portion 63, and a bent portion 66 formed by bending and extending the edge portion 65. The bent portion 66 is connected to the outer shell 1, and the bent portion 66 and the edge portion 65 form a limiting space 67 with the outer shell 1. The periphery of the first diaphragm 31 is limited within the limiting space 67, and the top cover portion 63 is provided with a sixth through hole 62.

[0206] 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 bent portion 66, the bent portion 66 of the front cover 6 is connected to the outer shell 1, so that a limiting space 67 is formed between the bent portion 66 and the edge portion 65 and the outer shell 1. In this way, the limiting space 67 can be used to accommodate and limit the installation of the periphery of the first diaphragm 31, thereby increasing the effective vibration area of the first diaphragm 31 and synchronously increasing the volume of the second cavity 61. In this way, the acoustic performance of the first diaphragm 31 can be improved.

[0207] As Figure 17 and Figure 18 shown, the present invention also provides an electronic device 800, and the electronic device 800 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 all 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.

[0208] 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, and the second side of the sound generating device 100 communicates with the rear cavity 750. Among them, the device housing 700 is provided with a sound outlet hole 720 that communicates 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, and the sound waves of the first diaphragm 31 and the second diaphragm 32 of the sound generating device 100 facing the second side are radiated to the rear cavity 750.

[0209] 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 together to enclose the receiving cavity 710.

[0210] 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.

[0211] 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.

[0212] In this embodiment, the first cavity 13 of the sound generating device 100 communicates with the rear cavity 750 through a first leakage hole 111, and the second side of the first diaphragm 31 communicates with 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 of the first diaphragm 31 and the second diaphragm 32 facing the second side are out of phase with the sound waves facing the first side.

[0213] In one embodiment, the device housing 700 is further provided with a second leakage hole 730 that communicates with the rear cavity 750. The sound waves of the first diaphragm 31 and the second diaphragm 32 facing the second side are radiated to the outside through the rear cavity 750 and the second leakage hole 730.

[0214] It can be understood that, such as Figure 17 and Figure 18As shown, a second leakage hole 730 is provided on the lower shell of the device housing 700. The second leakage hole 730 communicates with the rear cavity 750. The first diaphragm 31 and the second diaphragm 32 radiate sound waves with a phase opposite to that of the sound waves in the front cavity 740 into the rear cavity 750, 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.

[0215] In this embodiment, a second leakage hole 730 is provided on the lower shell of the device housing 700. The second leakage hole 730 communicates with the rear cavity 750 and is used to adjust the pressure 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 opposite in phase to 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.

[0216] 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.

[0217] In this embodiment, the upper shell includes a top wall and a first side wall, and the lower shell includes a bottom wall and a second side wall. The first 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, the bottom wall or the connection area between the side wall and the bottom wall. In this way, the sound emission 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.

[0218] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. 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 directly / indirectly applied 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, the magnetic circuit system being connected to the housing, the magnetic circuit system having a first magnetic gap and a second magnetic gap arranged at intervals, and the second magnetic gap surrounding the first magnetic gap, the magnetic circuit system further having a through hole, and the first magnetic gap surrounding the through hole; and a vibration system, the vibration system including a first diaphragm, a second diaphragm, a first voice coil, and a second voice coil, the first diaphragm and the second diaphragm being located on opposite sides of the magnetic circuit system, an outer peripheral edge of the first diaphragm being connected to the housing and being opposite to and spaced from the magnetic circuit system, an outer peripheral edge of the second diaphragm being connected to the housing, and an inner peripheral edge of the second diaphragm being connected to the magnetic circuit system, so that the housing, the second diaphragm, and the magnetic circuit system enclose and form a first cavity, the inner peripheral edge of the second diaphragm having a first through hole communicating with the through hole, one end of the first voice coil being connected to the first diaphragm, the other end of the first voice coil being suspended in the first magnetic gap, one end of the second voice coil being connected to the second diaphragm, and the other end of the second voice coil being suspended in the second magnetic gap; wherein, the sound generating device has a first side of the second diaphragm facing away from the first diaphragm and a second side of the first diaphragm facing away from the second diaphragm, sound waves of the first diaphragm facing the first side are radiated outwards through the through hole and the first through hole, and jointly radiate towards the first side with sound waves of the second diaphragm facing the first side; the housing is provided with a first leakage hole communicating the first cavity with the outside, the first leakage hole penetrating through a surface of the housing facing the second side, sound waves of the second diaphragm facing the second side are radiated outwards through the first leakage hole, and jointly radiate towards the second side with sound waves of the first diaphragm facing the second side.

2. The sound generating device according to claim 1, wherein, The magnetic circuit system includes a central magnetic part, a peripheral magnetic part, a magnetic yoke, and a support member, the central magnetic part and the magnetic yoke forming the first magnetic gap, the peripheral magnetic part and the magnetic yoke forming the second magnetic gap, the support member being arranged on a side of the magnetic yoke facing away from the central magnetic part and enclosing and forming an air flow cavity with the magnetic yoke, and the inner peripheral edge of the second diaphragm being connected to the support member; wherein, the support member is provided with a second through hole communicating the air flow cavity and the first through hole, the magnetic yoke is provided with a third through hole communicating the air flow cavity, the central magnetic part is provided with a fourth through hole corresponding to the third through hole, and the fourth through hole, the third through hole, and the second through hole form the through hole.

3. The sound generating device according to claim 2, wherein The magnetic yoke is further provided with a fifth through hole communicating the first magnetic gap and the air flow cavity, the fifth through hole being spaced from the third through hole; wherein, sound waves of the first diaphragm facing the first side are radiated outwards through the through hole and the first through hole, and at the same time are radiated outwards through the first magnetic gap, the fifth through hole, the air flow cavity, the second through hole, and the first through hole.

4. The sound generating device according to claim 3, 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 periphery of the first bottom plate is connected to the housing. The central magnetic part is disposed on the first top plate and is spaced from the first side plate to enclose the first magnetic gap. The side magnetic part is disposed on the first bottom plate and is spaced from the first side plate to enclose the second magnetic gap. The support member is disposed on a side of the first top plate facing away from the central magnetic part and encloses an air flow chamber with the first top plate. The first top plate is provided with the third through hole and the fifth through hole; Wherein, 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; and / or, the magnetic yoke is integrally stretched to form the first bottom plate, the first side plate, and the first top plate connected in sequence.

5. The sound generating device according to claim 1, wherein, The magnetic circuit system includes a central magnetic part, a side magnetic part, and a magnetic yoke connecting the central magnetic part and the side magnetic part; 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 disposed on the first top plate and is spaced from the first side plate to enclose the first magnetic gap. The side magnetic part 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 part and the first top plate; Wherein, the magnetic yoke further includes a support plate formed by bending and extending from 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 an end of the support plate away from the first top plate. The magnetic yoke is integrally stretched to form the first bottom plate, the first side plate, the first top plate, and the support plate connected in sequence.

6. The sound generating device according to claim 1, wherein The magnetic circuit system includes a central magnetic part, a side magnetic part, a ring magnet, a magnetic yoke, and a support member. The magnetic yoke includes a first top plate and a first bottom plate disposed at two ends of the ring magnet. The central magnetic part is disposed on the first top plate and is spaced from the ring magnet to form the first magnetic gap. The side magnetic part is disposed on the first bottom plate and is spaced from the ring magnet to form the second magnetic gap. The support member is disposed on a side of the first top plate facing away from the central magnetic part and encloses an air flow chamber with the first top plate. The inner periphery of the second diaphragm is connected to the support member; Wherein, the support member is provided with a second through hole communicating the air flow chamber and the first through hole. The first top plate is provided with a third through hole communicating the air flow chamber. The central magnetic part is provided with a fourth through hole corresponding to the third through hole. The fourth through hole, the third through hole, and the second through hole form the through hole.

7. The sound generating device according to claim 6, wherein, The first top plate is further provided with a fifth through hole communicating the first magnetic gap and the air flow cavity, and the fifth through hole is arranged at an interval from the third through hole; wherein, the sound wave on the first side facing the first diaphragm radiates outward through the through hole and the first through hole, and at the same time radiates outward through the first magnetic gap, the fifth through hole, the air flow cavity, the second through hole and the first through hole; And / or, the first bottom plate is provided with an avoidance groove corresponding to the second magnetic gap, and the avoidance groove is used for providing avoidance for the second voice coil; And / or, define the area of the first top plate as S1, define the opening area of the third through hole as S2, and S2 = (10% - 80%)S1; And / or, the central magnetic part includes a central magnet and a central magnetic conductive plate arranged in a stacked manner, the central magnet is connected to the first top plate, and the fourth through hole sequentially penetrates through the central magnetic conductive plate and the central magnet.

8. The sound generating device according to claim 2 or 6, characterized in that, 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 outward from one end of the second side plate away from the second top plate, and the second bottom plate is connected to the side of the magnetic yoke facing away from the central magnetic part, so that the second top plate, the second side plate and the magnetic yoke enclose to form the air flow cavity, the second top plate is provided with the second through hole, and the inner periphery of the second diaphragm is connected to the side of the second top plate facing away from the air flow cavity, so that the first 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 first through hole; or, the second through hole includes a plurality of second through holes, and the plurality of 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.

9. The sound generating device according to claim 2 or 5 or 6, characterized in that, The housing includes a first housing and a second housing connected to each other, one end of the first housing away from the second housing is connected to the outer periphery of the first diaphragm, one side of the second housing facing away from the first housing is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the first housing; Wherein, the first housing is provided with the first leakage hole, the first leakage hole penetrates through the surface of the first housing facing the second side, and the first leakage hole is located outside the first diaphragm.

10. The sound generating device according to claim 9, wherein, A support platform is convexly provided on the inner wall of the first housing, the outer periphery of the magnetic yoke and the outer periphery of the first diaphragm are respectively arranged on both sides of the support platform, and the first leakage hole is formed between the inner wall of the first housing and the support platform.

11. The sound generating device according to claim 9, characterized in that, The edge magnetic part includes a side magnet and a side magnetic conductive plate arranged in a stacked manner, the side magnet is connected to the magnetic yoke, the side magnetic conductive plate is connected to the second housing, and a leakage channel communicating the first leakage hole is formed between the side magnetic conductive plate and the second housing.

12. The sound generating device according to claim 1, wherein, The first diaphragm includes a surround portion and a dome, the surround portion is disposed around the dome, an outer edge of the surround portion is connected to the housing, and the first voice coil is connected to the dome; And / or, the second diaphragm includes an inner surround, a vibrating portion, and an outer surround that are sequentially connected. An inner peripheral edge of the inner surround is connected to the magnetic circuit system and is provided with the first through hole. An outer side of the outer surround is connected to the housing, and 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.

13. The sound generating device according to claim 1, characterized in that, 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, 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, and the first sound wave and the second sound wave are out of phase; And / or, the second diaphragm is annular, an inner edge of the second diaphragm forms the first through hole, and the sound generating device further includes a first air-permeable member, and the first air-permeable member is connected to the inner edge of the second diaphragm and covers the first through hole; And / or, the sound generating device further includes a second air-permeable member, and the second air-permeable member covers the first leakage hole; And / or, the sound generating device further includes a first positioning ring, and the first positioning ring is disposed between an outer peripheral edge 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 disposed between an outer peripheral edge of the second diaphragm and the housing; And / or, the sound generating device further includes a front cover, a periphery of the front cover is connected to the housing and is located on a side of the first diaphragm facing away from the second diaphragm. A second cavity is formed between the first diaphragm and the front cover, and the front cover is provided with a sixth through hole communicating the second cavity and the outside.

14. 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 13, 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. A first side of the sound generating device communicates with the front cavity, and a second side of the sound generating device communicates with the rear cavity; Wherein, the device housing is provided with a sound outlet hole communicating with the front cavity. 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, and sound waves of the first diaphragm and the second diaphragm of the sound generating device facing the second side are radiated to the rear cavity.

15. The electronic device according to claim 14, wherein The first diaphragm and the second diaphragm vibrate in the same direction, and sound waves of the first diaphragm and the second diaphragm facing the second side are out of phase with sound waves facing the first side; The device housing is further provided with a second leakage hole communicating with the rear cavity, and sound waves of the first diaphragm and the second diaphragm facing the second side are radiated to the outside through the rear cavity and the second leakage hole.

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