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 first magnetic gap is formed between an edge magnetic part of a magnetic circuit system of the sound production device and a magnetic conductive yoke, a second magnetic gap is formed between a central magnetic part and the magnetic conductive yoke, a support member is arranged on one side of the magnetic conductive yoke back to the central magnetic part, and the support member and the magnetic conductive yoke enclose to form an airflow cavity; the magnetic conductive yoke is provided with a first through hole communicated with the second magnetic gap and the airflow cavity, the supporting piece is provided with a second through hole communicated with the airflow cavity, a first vibrating diaphragm and a second vibrating diaphragm of the vibrating system are located on the two opposite sides of the magnetic circuit system, and the first vibrating diaphragm is provided with a third through hole communicated with the second through hole. The first voice coil and the second voice coil are arranged in the first magnetic gap and the second magnetic gap respectively, and sound waves of the first side of the second vibrating diaphragm and sound waves of the first side of the first vibrating diaphragm are radiated outwards on the same side of the sound production device together. According to the sound production device, the high-frequency performance is improved, and the vibration area of the vibration system is increased, so that the performance and the effect of the whole machine are improved.

Description

Technical Field

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

[0002] In recent years, with the 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.

[0003] The sound generating device is an important electroacoustic transducer component in consumer electronic products and is widely used as a loudspeaker, a receiver, a 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 related technologies, in order to improve the performance of the sound generating device, the product design is becoming more and more extreme, and the space utilization rate is also 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 effect of the whole machine. 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 that can effectively improve high-frequency performance. The sound generating device not only reduces the reliability risk but also effectively improves high-frequency performance, thereby improving the overall 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 includes a central magnetic part, a side magnetic part, and a magnetic yoke connecting the central magnetic part and the side magnetic part. A first magnetic gap is formed between the side magnetic part and the magnetic yoke, a second magnetic gap is formed between the central magnetic part and the magnetic yoke, and the first magnetic gap surrounds the second magnetic gap;

[0008] A support member, the support member is disposed 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 magnetic yoke is provided with a first through hole communicating the second magnetic gap and the air flow cavity, and the support member is provided with a second through hole communicating the air flow cavity; and

[0009] A vibration system, the vibration system including a first diaphragm, a second diaphragm, a first voice coil and a second voice coil. The outer peripheral edge of the first diaphragm is connected to the housing, the inner peripheral edge of the first diaphragm is connected to the support member, and a third through hole communicating with the second through hole is provided at the inner peripheral edge of the first diaphragm. The outer peripheral edge of the second diaphragm is connected to the housing, and is opposite to and spaced from the magnetic circuit system. The first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system. 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;

[0010] Wherein, the sound wave on the first side of the second diaphragm is radiated outward through the first through hole, the air flow cavity, the second through hole and the third through hole, and jointly radiates outward on the same side of the sound generating device with the sound wave on the first side of the first diaphragm.

[0011] 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 first bottom plate is connected to the housing, the central magnetic part is arranged on the first top plate, and is spaced from the first side plate to enclose and form the second magnetic gap. The side magnetic part is arranged on the first bottom plate, and is spaced from the first side plate to enclose and form the first magnetic gap;

[0012] Wherein, the first through hole is provided on the first top plate, and the support member is arranged on the side of the first top plate facing away from the central magnetic part, and encloses with the first top plate to form the air flow cavity.

[0013] In an embodiment, the first top plate includes a convex part and a support part connected to each other. The convex part protrudes from the first top plate towards the central magnetic part, so that the support part surrounds the convex part;

[0014] Wherein, the support part is provided with the first through hole, the central magnetic part is arranged on the convex part, and is spaced from the support part to enclose and form an air flow channel. The air flow channel communicates the second magnetic gap and the first through hole, and the support member is connected to the side of the support part facing away from the air flow channel.

[0015] In an embodiment, a support groove is formed by the side of the support part facing the support member being recessed towards the air flow channel, and the periphery of the support member is limited in the support groove;

[0016] And / or, an inclined surface is formed at the connection between the convex part and the support part, and the first through hole sequentially penetrates through the support part and the inclined surface;

[0017] And / or, the first through holes include a plurality of them, and the plurality of first through holes are arranged at intervals and surround the convex portion;

[0018] And / or, the first through hole is an arc-shaped hole extending along the periphery of the convex portion;

[0019] And / or, the first bottom plate is provided with an avoidance groove corresponding to the first magnetic gap, and the avoidance groove is used to provide avoidance for the first voice coil;

[0020] And / or, the first top plate and the first bottom plate are connected to both ends of the first side plate along the vibration direction of the vibration system;

[0021] And / or, define the area of the first top plate as S1, define the opening area of the first through hole as S2, and S2=(10% - 80%)S1.

[0022] In one embodiment, the support member includes a second top plate, a second side plate provided at the periphery of the second top plate, and a second bottom plate extending outward from one end of the second side plate away from the second top plate. The second bottom plate is connected to the side of the magnetic yoke facing away from the central magnetic portion, so that the second top plate, the second side plate, and the magnetic yoke enclose the air flow cavity;

[0023] Wherein, the second top plate is provided with the second through hole, and the inner peripheral edge of the first diaphragm is connected to the side of the second top plate facing away from the air flow cavity, so that the third through hole is communicated with the second through hole.

[0024] In one embodiment, the second through hole is one, and the second through hole is correspondingly communicated with the third through hole; or, the second through hole includes a plurality of them; the plurality of second through holes are arranged at intervals;

[0025] 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;

[0026] 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.

[0027] In one embodiment, the first diaphragm includes an inner folding ring, a vibrating portion, and an outer folding ring connected in sequence. The third through hole is provided inside the inner folding ring and is connected to the support member. The outside of the outer folding ring is connected to the housing, and the first voice coil is connected to the vibrating portion.

[0028] In one embodiment, the first diaphragm further includes a vibrating plate, and the vibrating plate is arranged between the vibrating portion and the first voice coil;

[0029] And / or, the second diaphragm includes a surround portion and a reinforcement portion. The surround portion is disposed around the reinforcement portion. The outer edge of the surround portion is connected to the housing, and the second voice coil is connected to the reinforcement portion;

[0030] And / or, 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 outside 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. The outer periphery of the magnetic yoke is connected to one side of the second housing facing away from the second diaphragm.

[0031] In one embodiment, the first diaphragm and the second diaphragm vibrate in the same direction. The first side of the first diaphragm and the second diaphragm radiates a first sound wave to the outside environment, and the second side of the first diaphragm and the second diaphragm radiates a second sound wave to the outside environment. The first sound wave and the second sound wave are out of phase;

[0032] Alternatively, 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 of the first diaphragm and the second diaphragm communicates with the front cavity, and the second side of the first diaphragm and the second diaphragm communicates with the rear cavity. The first diaphragm and the second diaphragm vibrate in the same direction, radiate a first sound wave to the front cavity, and radiate a second sound wave to the rear cavity. The first sound wave and the second sound wave are out of phase;

[0033] And / or, the first diaphragm is annular, the inner edge of the first diaphragm forms the third through hole, and the sound generating device further includes a first air-permeable member connected to the inner edge of the first diaphragm and covering the third through hole;

[0034] And / or, a first cavity is formed between the first diaphragm, the housing, the magnetic yoke and the support member. The sound generating device is provided with a first leakage hole communicating the first cavity with the outside, and the sound generating device further includes a second air-permeable member covering the first leakage hole.

[0035] In one embodiment, the central magnetic portion includes a central magnet and a central magnetic plate stacked, and the central magnet is connected to the magnetic yoke;

[0036] And / or, the edge magnetic portion includes an edge magnet and an edge magnetic plate stacked. The edge magnet is connected to the magnetic yoke, and the edge magnetic plate and the housing are an integrally formed structure;

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

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

[0039] And / or, the sound generating device further includes a front cover located on a side of the first diaphragm away from the second diaphragm. A second cavity is formed between the first diaphragm and the front cover. The front cover is provided with a fourth through hole communicating the second cavity with the outside, and sound waves of the first diaphragm and the second diaphragm are radiated to the outside through the fourth through hole.

[0040] In an embodiment, the magnetic circuit system further includes a first magnet disposed in the air flow cavity, and the first magnet is used to assist in increasing the number of magnetic induction lines passing through the magnetic yoke.

[0041] In an embodiment, opposite sides of the first magnet are respectively connected to the magnetic yoke and the support member;

[0042] Wherein, the first through holes include a plurality of them, and the plurality of first through holes are spaced apart and arranged around the first magnet; and / or, the second through holes include a plurality of them, and the plurality of second through holes are spaced apart and arranged around the first magnet.

[0043] The present invention further provides an electronic device, and the electronic device includes:

[0044] A device housing provided with a receiving cavity; and

[0045] The above-mentioned sound generating device is disposed in the receiving cavity and divides the receiving cavity into a mutually isolated front cavity and a rear cavity. The first side of the first diaphragm and the second diaphragm communicates with the front cavity;

[0046] Wherein, the device housing is provided with a sound outlet hole communicating with the front cavity, and sound waves on the first side of the first diaphragm and the second diaphragm of the sound generating device are radiated to the outside through the front cavity and the sound outlet hole.

[0047] In an embodiment, the device housing is further provided with a second leakage hole communicating with the rear cavity;

[0048] The first diaphragm and the second diaphragm radiate sound waves with a phase opposite to that of the sound waves in the front cavity to the rear cavity, and the sound waves in the rear cavity are radiated to the outside through the second leakage hole.

[0049] In an embodiment, the device housing includes a top wall and a bottom wall disposed opposite to each other and a side wall connecting the top wall and the bottom wall. Among them,

[0050] The sound outlet is provided on the top wall or the connection area between the side wall and the top wall, and the second leakage hole is provided on the side wall or the bottom wall or the connection area between the side wall and the bottom wall.

[0051] In the sound generating device of the technical solution of the present invention, the magnetic circuit system and the vibration system are accommodated in the housing, and a first magnetic gap and a second magnetic gap are provided on the magnetic circuit system, so that the first magnetic gap surrounds the second 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, and the sound waves of the first diaphragm and the second diaphragm are radiated outward on the same side of the sound generating device. Thus, when currents are passed through the first voice coil and the second voice coil, the first voice coil and the second voice coil respectively convert electrical energy into mechanical energy in the first magnetic gap and the second magnetic gap formed by the magnetic circuit system, so as to drive the first voice coil and the second voice coil to drive the first diaphragm and the second diaphragm to vibrate respectively. Not only can sound be generated by driving two diaphragms driven by two voice coils through one magnetic circuit system, but also the same-side sound emission of the double-sided diaphragms can be realized without increasing the external dimension, and the vibration area of the vibration system is increased, so as to achieve the purpose of performance improvement; further, by setting the magnetic circuit system as a central magnetic part, an edge magnetic part and a magnetic yoke connecting the central magnetic part and the edge magnetic part, a first magnetic gap is formed between the edge magnetic part and the magnetic yoke, a second magnetic gap is formed between the central magnetic part and the magnetic yoke, and a support is arranged on the side of the magnetic yoke facing away from the central magnetic part. Thus, the inner periphery of the first diaphragm is connected and fixed by the support, and an air flow cavity is formed by enclosing the support and the magnetic yoke, and a first through hole communicating the second magnetic gap and the air flow cavity is provided on the magnetic yoke, a second through hole communicating the air flow cavity is provided on the support, and a third through hole communicating the second through hole is provided on the inner periphery of the first diaphragm. In this way, the sound waves on the first side of the second diaphragm are radiated outward in sequence through the first through hole, the air flow cavity, the second through hole and the third through hole, so that the sound waves on the first side of the first diaphragm and the second diaphragm are jointly radiated outward on the same side of the sound generating device, which is beneficial to the superposition of the compressed air when the first diaphragm and the second diaphragm vibrate, and improves the loudness and sensitivity of the sound generating device; and the first diaphragm and the central magnetic part are respectively installed and fixed by the support and the magnetic yoke to improve the installation stability, thereby reducing the reliability risk, and the air flow circulation area when the second diaphragm vibrates is effectively increased through the first through hole of the magnetic yoke and the air flow cavity formed by the magnetic yoke and the support, so as to ensure smoother air flow circulation and improve the high-frequency performance of the second diaphragm, and thus improve the high-frequency performance after the superposition of the first diaphragm and the second diaphragm. Description of the Drawings

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the 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.

[0053] Figure 1 Schematic structural diagram of an embodiment of the sound generating device provided by the present invention;

[0054] Figure 2 Schematic structural diagram of another perspective of an embodiment of the sound generating device provided by the present invention;

[0055] Figure 3 Exploded schematic diagram of an embodiment of the sound generating device provided by the present invention;

[0056] Figure 4 Cross-sectional schematic diagram of an embodiment of the sound generating device provided by the present invention;

[0057] Figure 5 Cross-sectional schematic diagram of another embodiment of the sound generating device provided by the present invention;

[0058] Figure 6 Exploded schematic diagram of another embodiment of the sound generating device provided by the present invention;

[0059] Figure 7 Schematic structural diagram of an embodiment of the magnetic yoke provided by the present invention;

[0060] Figure 8 Cross-sectional schematic diagram of an embodiment of the magnetic yoke provided by the present invention;

[0061] Figure 9 Schematic structural diagram of an embodiment of the support member provided by the present invention;

[0062] Figure 10 Schematic structural diagram of another embodiment of the support member provided by the present invention;

[0063] Figure 11 Schematic structural diagram of an embodiment of the electronic device provided by the present invention.

[0064] Explanation of the reference numerals in the drawings:

[0065] 100, Sound generating device; 1, Housing; 11, First housing; 111, First leakage hole; 12, Second housing; 13, First cavity; 2, Magnetic circuit system; 21, Magnetic yoke; 211, First top plate; 2111, First through hole; 2112, Protrusion; 2113, Support portion; 2114, Air flow channel; 2115, Support groove; 2116, Inclined surface; 212, First bottom plate; 213, First side plate; 22, Central magnetic portion; 221, Central magnet; 222, Central magnetic guide plate; 23, Edge magnetic portion; 231, Edge magnet; 232, Edge magnetic guide plate; 24, First magnet; 25, First magnetic gap; 26, Second magnetic gap; 3, Vibration system; 31, First diaphragm; 311, Inner folding ring; 312, Vibration portion; 313, Outer folding ring; 314, Third through hole; 315, Vibration plate; 32, Second diaphragm; 321, Folding ring portion; 322, Reinforcing portion; 33, First voice coil; 34, Second voice coil; 4, Support member; 41, Air flow cavity; 42, Second top plate; 421, Second through hole; 43, Second side plate; 44, Second bottom plate; 51, First positioning ring; 52, Second positioning ring; 61, First air permeable member; 62, Second air permeable member; 7, Front cover; 71, Second cavity; 72, Fourth through hole; 800, Device housing; 810, Receiving cavity; 820, Sound outlet hole; 830, Second leakage hole; 840, Front cavity; 850, Rear cavity; 900, Electronic device.

[0066] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0067] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0068] It should be noted that all the directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0069] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B at the same time.

[0070] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, 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 results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0071] 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.

[0072] 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 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 be convenient and comfortable to wear, the non-earplugged method is adopted, so the improvement of the performance of the sound generating device is extremely urgent.

[0073] Traditional Driver designs all vibrate and generate sound unidirectionally. In the cavity of the whole machine with limited internal space, it is difficult to increase the vibration area and vibration displacement, so the space for improving the performance of the sound generating device is relatively limited and cannot meet the requirements of existing wearable audio products such as OWS. At the same time, in order to improve the performance of the sound generating 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 and being unfavorable to the improvement of high-frequency performance, thus making the performance and effect of the whole machine poor.

[0074] Based on the above concepts and problems, the present invention proposes a sound generating device 100. It can be understood that the sound generating device 100 is applied to an electronic device, and the electronic device can be a mobile phone, a headphone, a smart wearable device, etc., which is not limited herein.

[0075] In this embodiment, the sound generating device 100 of the present invention is provided with a dual diaphragm and a dual voice coil structure, and uses a magnetic circuit system 2 to drive the vibrations of two diaphragms of two voice coil bands to generate sound. At the same time, without increasing the external dimensions, the sound is generated by the dual diaphragms, increasing the vibration area of the vibration system 3, thereby achieving the purpose of performance improvement. Moreover, the dual diaphragms radiate sound waves on the same side of the sound generating device 100, which is beneficial to improving the loudness and sensitivity of the sound generating device 100. In addition, a support member 4 is provided, and the magnetic yoke 21 is set as a positive and negative stretching structure, thereby increasing the connection area between the support member 4 and the inner edge of the first diaphragm 31 and the connection area between the central magnetic part 22 of the magnetic circuit system 2 and the magnetic yoke 21. While improving the stability, the reliability risk is reduced. And by using the first through hole 2111 of the magnetic yoke 21 and the air flow cavity 41 formed by the magnetic yoke 21 and the support member 4, the air flow passage area during the vibration of the second diaphragm 32 is effectively increased, thereby ensuring smoother air flow and improving the high-frequency performance of the second diaphragm 32, and thus improving the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32.

[0076] Please refer to Figures 1 to 10 As shown, in the embodiment of the present invention, the sound generating device 100 includes a housing 1, a magnetic circuit system 2, a support member 4, and a vibration system 3. The magnetic circuit system 2 is connected to the housing 1. The magnetic circuit system 2 includes a central magnetic part 22, an edge magnetic part 23, and a magnetic yoke 21 connecting the central magnetic part 22 and the edge magnetic part 23. A first magnetic gap 25 is formed between the edge magnetic part 23 and the magnetic yoke 21, and a second magnetic gap 26 is formed between the central magnetic part 22 and the magnetic yoke 21. The first magnetic gap 25 is arranged around the second magnetic gap 26. The support member 4 is disposed on the side of the magnetic yoke 21 facing away from the central magnetic part 22 and encloses an air flow cavity 41 with the magnetic yoke 21. The magnetic yoke 21 is provided with a first through hole 2111 communicating the second magnetic gap 26 and the air flow cavity 41, and the support member 4 is provided with a second through hole 421 communicating the air flow cavity 41. 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 outer periphery of the first diaphragm 31 is connected to the housing 1, the inner periphery of the first diaphragm 31 is connected to the support member 4, and a third through hole 314 communicating the second through hole 421 is provided at the inner periphery of the first diaphragm 31. The outer periphery of the second diaphragm 32 is connected to the housing 1, and is opposite to and spaced from the magnetic circuit system 2. The first diaphragm 31 and the second diaphragm 32 are located on opposite sides of the magnetic circuit system 2. 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 waves on the first side of the second diaphragm 32 are radiated outward through the first through hole 2111, the air flow cavity 41, the second through hole 421, and the third through hole 314, and jointly radiate outward on the same side of the sound generating device 100 with the sound waves on the first side of the first diaphragm 31.

[0077] In this embodiment, the sound generating device 100 can be a sound generating element 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 opposite to each other.

[0078] It can be understood that the housing 1 is used to mount, fix and support components such as the magnetic circuit system 2 and the vibration system 3, that is, the housing 1 provides a mounting 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. The housing 1 in this embodiment can be optionally a box body or a frame structure, that is, the housing 1 has a cavity with openings at both 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 both ends of the housing 1. In this way, a double diaphragm structure is formed, so that two diaphragms of two voice coil bands of the vibration system 3 are driven to vibrate by one magnetic circuit system 2 to realize sound generation. At the same time, without increasing the external dimensions, the double-sided diaphragms can emit 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.

[0079] 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.

[0080] Optionally, the sound waves on the first sides of the first diaphragm 31 and the second diaphragm 32 radiate outward on the same side of the sound generating device 100. In this way, the sound waves of the first diaphragm 31 and the second diaphragm 32 in the vibration system 3 can be superimposed to produce sound, thereby improving the sound generation effect and performance. In this embodiment, the first diaphragm 31 and the second diaphragm 32 can be optionally vibrated in the same direction and radiate sound waves with the same phase. In this way, the volume of the sound generating device 100 can be increased. In this application, the sound generating device 100 has a first side and a second side facing away from each other. The first side refers to the side where the first diaphragm 31 is far from the second diaphragm 32, and the second side refers to the side where the second diaphragm 32 is far from the first diaphragm 31. The first side and the second side can be understood in terms of orientation or direction.

[0081] 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 herein. 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 herein.

[0082] Optionally, the housing 1 has a cylindrical structure, that is, both ends of the housing 1 have openings. 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. 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 and further facilitates its assembly into the whole machine, simplifying the reserved structure of the whole machine.

[0083] In this embodiment, as Figures 1 to 6 shown, 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 outside of the first diaphragm 31. One side of the second housing 12 facing away from the first housing 11 is connected to the outer periphery of the second diaphragm 32. The outer periphery of the magnetic yoke 21 is connected to one side of the second housing 12 facing away from the second diaphragm 32.

[0084] 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 by the first housing 11, and the second diaphragm 32 can be assembled by 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 the external circuit, etc.

[0085] In this embodiment, by setting the magnetic circuit system 2 as a central magnetic part 22, side magnetic parts 23 and a magnetic yoke 21, the central magnetic part 22 and the side magnetic parts 23 are installed and fixed by the magnetic yoke 21, so that a first magnetic gap 25 is formed between the side magnetic part 23 and the magnetic yoke 21, a second magnetic gap 26 is formed between the central magnetic part 22 and the magnetic yoke 21, and the side magnetic parts 23 are located outside the central magnetic part 22, so that the first magnetic gap 25 surrounds the second magnetic gap 26. In this way, it is convenient for the first voice coil 33 and the second voice coil 34 of the vibration system 3 to correspond to the first magnetic gap 25 and the second magnetic gap 26 respectively, and conductive terminals are arranged on the housing 1, so that both the first voice coil 33 and the second voice coil 34 are electrically connected to the conductive terminals. In this way, when currents are 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 is sound generated by driving two diaphragms of two voice coil bands to vibrate through one magnetic circuit system 2, but also the same-direction sound emission of the double-sided diaphragms is realized 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.

[0086] In order to achieve the acoustic waves on the first side of the first diaphragm 31 and the second diaphragm 32 to radiate outward on the same side of the sound generating device 100 and be superimposed and enhanced to improve the high-frequency performance. In this embodiment, a support member 4 is provided on the side of the magnetic yoke 21 facing away from the central magnetic portion 22. The support member 4 is used to connect and fix the inner periphery of the first diaphragm 31. At the same time, an air flow cavity 41 is formed by enclosing the support member 4 and the magnetic yoke 21. A first through hole 2111 communicating the second magnetic gap 26 and the air flow cavity 41 is provided on the magnetic yoke 21, and a second through hole 421 communicating the air flow cavity 41 is provided on the support member 4. A third through hole 314 is provided at the inner periphery of the first diaphragm 31. In this way, the acoustic waves on the first side of the second diaphragm 32 are radiated outward in sequence through the first through hole 2111, the air flow cavity 41, the second through hole 421 and the third through hole 314. That is, the second magnetic gap 26, the first through hole 2111, the air flow cavity 41, the second through hole 421 and the third through hole 314 are sequentially connected to form an air flow channel, so as to facilitate the acoustic waves on the first side of the second diaphragm 32 to radiate outward through this air flow channel. In this way, the acoustic waves on the first side of the first diaphragm 31 and the second diaphragm 32 are jointly radiated outward on the same side of the sound generating device 100, which is beneficial to the superposition of the compressed air when the first diaphragm 31 and the second diaphragm 32 vibrate, and improves the loudness and sensitivity of the sound generating device 100; at the same time, the support member 4 and the magnetic yoke 21 are respectively used to install and fix the first diaphragm 31 and the central magnetic portion 22 to improve the installation stability, thereby reducing the reliability risk, and the air flow area when the second diaphragm 32 vibrates is effectively increased through the first through hole 2111 of the magnetic yoke 21 and the air flow cavity 41 formed by the magnetic yoke 21 and the support member 4, so as to ensure smoother air flow, improve the high-frequency performance of the second diaphragm 32, and thus improve the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32.

[0087] 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 first magnetic gap 25 surrounds the second magnetic gap 26. The vibration system 3 is set as a first diaphragm 31, a second diaphragm 32, a first voice coil 33 and a second voice coil 34, such that the first diaphragm 31 and the second diaphragm 32 are respectively 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, 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, the other end of the second voice coil 34 is suspended in the second magnetic gap 26, and the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 are radiated outward on the same side of the sound generating device 100. Thus, when currents are 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 is sound generated by driving two voice coils to drive two diaphragms to vibrate through one magnetic circuit system 2, but also the same-side sound radiation of the double-sided diaphragms is realized 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 magnetic circuit system 2 is set as a central magnetic part 22, a side magnetic part 23 and a magnetic yoke 21 connecting the central magnetic part 22 and the side magnetic part 23, such that a first magnetic gap 25 is formed between the side magnetic part 23 and the magnetic yoke 21, a second magnetic gap 26 is formed between the central magnetic part 22 and the magnetic yoke 21, and a support member 4 is arranged on the side of the magnetic yoke 21 facing away from the central magnetic part 22. Thus, the inner periphery of the first diaphragm 31 is connected and fixed by the support member 4, and an air flow cavity 41 is formed by enclosing the support member 4 and the magnetic yoke 21. A first through hole 2111 communicating the second magnetic gap 26 and the air flow cavity 41 is provided on the magnetic yoke 21, a second through hole 421 communicating the air flow cavity 41 is provided on the support member 4, and a third through hole 314 communicating the second through hole 421 is provided on the inner periphery of the first diaphragm 31. Thus, the second diaphragm 32 radiates sound waves outward through the first through hole 2111, the air flow cavity 41, the second through hole 421 and the third through hole 314 in sequence, so as to realize the same-side outward radiation of the sound waves on the first side of the first diaphragm 31 and 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, and improves the loudness and sensitivity of the sound generating device 100;Moreover, the first diaphragm 31 and the central magnetic part 22 are respectively installed and fixed by the support member 4 and the magnetic yoke 21 to improve the installation stability, thereby reducing the reliability risk. And through the first through hole 2111 of the magnetic yoke 21 and the air flow cavity 41 formed by the magnetic yoke 21 and the support member 4, the air flow area when the second diaphragm 32 vibrates is effectively increased, so as to ensure smoother air flow, improve the high-frequency performance of the second diaphragm 32, and thus improve the high-frequency performance after the superposition of the first diaphragm 31 and the second diaphragm 32.

[0088] In this embodiment, the magnetic yoke 21 is a metal magnetic conductive plate. Optionally, the support member 4 is a metal part. It can be understood that the support member 4 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 4 can be selected as an injection molded part. The support member 4 and the magnetic yoke 21 can be integrally injection molded, which is not limited herein.

[0089] 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 outside environment, and the second side of the first diaphragm 31 and the second diaphragm 32 radiates a second sound wave to the outside 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 are in communication with the outside environment, and the sound waves radiated from the first side and the second side to the outside environment are out of phase. 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.

[0090] In one embodiment, the sound generating device 100 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 of the first diaphragm 31 and the second diaphragm 32 is in communication with the front cavity, and the second side of the first diaphragm 31 and the second diaphragm 32 is in communication with the rear cavity. The first diaphragm 31 and the second diaphragm 32 vibrate in the same direction, and radiate a first sound wave to the front cavity and a second sound wave to the rear cavity. The first sound wave and the second sound wave are out of phase. It can be understood that the electronic device usually has a sound outlet hole for the front cavity sound wave to radiate out. When using the electronic device, the front cavity sound wave can be radiated out through the sound outlet hole and received by the user. Further, the rear cavity sound wave can optionally be radiated out through the rear leakage hole (the second leakage hole in the present application). In this way, the front and rear cavity sound waves can form a sound dipole, achieving the technical effect of reducing sound leakage. Or, the rear cavity sound wave can not be radiated out. 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. Select and use according to the actual situation.

[0091] In one embodiment, the first diaphragm 31 is annular, a third through-hole 314 is formed at the inner edge of the first diaphragm 31, the sound generating device 100 further includes a first air-permeable member 61, and the first air-permeable member 61 is connected to the inner edge of the first diaphragm 31 and covers the third through-hole 314.

[0092] In this embodiment, as Figures 3 to 6 shown, the first diaphragm 31 can be selected as an annular diaphragm. At this time, a third through-hole 314 is formed at the inner edge of the first diaphragm 31, that is, a third through-hole 314 is formed at the inner edge of the first diaphragm 31. It can be understood that by providing the first air-permeable member 61, the first air-permeable member 61 is connected to the inner edge of the first diaphragm 31 and covers the third through-hole 314, so as to 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.

[0093] In one embodiment, a first cavity 13 is formed among the first diaphragm 31, the housing 1, the magnetic yoke 21 and the support member 4 of the sound generating device 100. The sound generating device 100 is provided with a first leakage hole 111 communicating the first cavity 13 with the outside, and the sound generating device 100 further includes a second air-permeable member 62 covering the first leakage hole 111.

[0094] In this embodiment, as Figure 4 and Figure 5 shown, a first cavity 13 is enclosed among the first diaphragm 31, the housing 1, the magnetic yoke 21 and the support member 4 of the vibration system 3. The first cavity 13 can be selected as a sealed cavity. In order to balance the air pressure in the first cavity 13 and improve the vibration balance of the first diaphragm 31. It can be understood that by providing a first leakage hole 111 communicating the first cavity 13 with the outside on the sound generating device 100, the first leakage hole 111 is used to discharge air, adjust the air pressure in the first cavity 13, balance the air pressure on both sides of the first diaphragm 31, and improve the vibration stability of the first diaphragm 31.

[0095] Optionally, the first leakage hole 111 includes a plurality of holes. 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 first diaphragm 31.

[0096] In this embodiment, by providing a second air-permeable member 62 on the first leakage hole 111 and using the second air-permeable member 62 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 first diaphragm 31, and improve the vibration stability of the first diaphragm 31.

[0097] Optionally, a first leakage hole 111 is provided between the first housing 11 and the second housing 12 of the housing 1, and a second air-permeable member 62 is provided in the first leakage hole 111. In this way, the flow rate of the regulating air flow 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.

[0098] 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 first bottom plate 212 is connected to the housing 1. The central magnetic portion 22 is disposed on the first top plate 211 and is spaced from the first side plate 213 to enclose a second magnetic gap 26. The edge magnetic portion 23 is disposed on the first bottom plate 212 and is spaced from the first side plate 213 to enclose a first magnetic gap 25. Wherein, the first top plate 211 is provided with a first through hole 2111, and the support member 4 is disposed on the side of the first top plate 211 facing away from the central magnetic portion 22 and encloses an air flow cavity 41 with the first top plate 211.

[0099] In this embodiment, as Figures 3 to 8 shown, the magnetic yoke 21 can be optionally an integrally formed structure, so as to improve the structural strength of the magnetic yoke 21 and thus improve the installation stability. Optionally, the first side plate 213 of the magnetic yoke 21 is 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 portion 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 second magnetic gap 26. The first bottom plate 212 is optionally connected to one end of the first side plate 213 away from the first top plate 211, and the first bottom plate 212 extends in a direction away from the receiving cavity and is disposed at an angle with the first side plate 213. The edge magnetic portion 23 is disposed on the first bottom plate 212 and is spaced from the first side plate 213 to enclose a first magnetic gap 25, that is, the edge magnetic portion 23 and the central magnetic portion 22 are located on opposite sides of the first side plate 213.

[0100] 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, 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.

[0101] In this embodiment, as Figure 4 and Figure 5As shown, the support member 4 is disposed on a 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 41 with the first top plate 211. The first top plate 211 is provided with a first through hole 2111 communicating the air flow chamber 41 and the second magnetic gap 26.

[0102] It can be understood that the number of the first through holes 2111 is one or more. In order to keep the air flow smooth and ensure the vibration balance of the second diaphragm 32, the number of the first through holes 2111 is at least 2. In specific applications, different numbers of the first through holes 2111 are set according to needs, and the first through holes 2111 are spaced apart from each other. Optionally, the first through holes 2111 include a plurality, and the plurality of first through holes 2111 are spaced apart. In this embodiment, the plurality of first through holes 2111 are arranged around the central magnetic portion 22 and are evenly and spaced apart.

[0103] In an embodiment, the area of the first top plate 211 is defined as S1, and the opening area of the first through hole 2111 is defined as S2, and S2 = (10% - 80%)S1.

[0104] In this embodiment, by controlling the opening area of the first through hole 2111 on the first top plate 211, it is beneficial for the sound wave of the second diaphragm 32 to radiate to the outside, and the structural strength of the magnetic yoke 21 and the connection area between the central magnetic portion 22 and the first top plate 211 can be ensured, thereby improving the stability. Optionally, the opening area S2 of the first through hole 2111 accounts for 10% - 80% of the area S1 of the first top plate 211. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., which are not limited herein.

[0105] It can be understood that if the area of the first through hole 2111 is too small, it is not conducive to the sound wave of the second diaphragm 32 to radiate to the outside; if the area of the first through hole 2111 is too large, the bonding area between the central magnetic portion 22 and the first top plate 211 is too small, which is not conducive to improving the connection reliability between the two.

[0106] It should be noted that when the first through hole 2111 is one, the opening area S2 of the first through hole 2111 is the opening area of one first through hole 2111. When the first through holes 2111 are multiple, the opening area S2 of the first through holes 2111 is the sum of the opening areas of the multiple first through holes 2111.

[0107] In order to further ensure the smooth flow of the air current below the second diaphragm 32, improve the high-frequency performance of the second diaphragm 32, 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 2112 and a support portion 2113 that are connected to each other. The convex portion 2112 protrudes from the first top plate 211 toward the central magnetic portion 22, so that the support portion 2113 is disposed around the convex portion 2112; wherein, the support portion 2113 is provided with a first through hole 2111, and the central magnetic portion 22 is disposed on the convex portion 2112 and is spaced from the support portion 2113 to enclose an air flow channel 2114. The air flow channel 2114 communicates the second magnetic gap 26 and the first through hole 2111, and the support member 4 is connected to the side of the support portion 2113 facing away from the air flow channel 2114.

[0108] In this embodiment, as Figures 3 to 8 shown, by providing a convex portion 2112 protruding toward the central magnetic portion 22 on the first top plate 211 of the magnetic yoke 21, the central magnetic portion 22 is disposed on the convex portion 2112 and is spaced from the support portion 2113 to enclose an air flow channel 2114, and a first through hole 2111 is provided in the support portion 2113. In this way, by using the air flow channel 2114 to communicate the second magnetic gap 26 and the first through hole 2111, it is possible to ensure the smooth flow of the air current below the second diaphragm 32, improve the high-frequency performance of the second diaphragm 32, and at the same time ensure the magnet volume of the central magnetic portion 22, thereby ensuring the magnetic field strength.

[0109] It can be understood that the convex portion 2112 is located at the center of the first top plate 211, so as to facilitate the installation and fixation of the central magnetic portion 22. The support portion 2113 is disposed around the convex portion 2112. In this way, a plurality of first through holes 2111 can be provided to ensure the smooth flow of the air current below the second diaphragm 32.

[0110] In this embodiment, as Figures 3 to 8 shown, an inclined surface 2116 is formed at the connection between the convex portion 2112 and the support portion 2113, and the first through hole 2111 sequentially penetrates through the support portion 2113 and the inclined surface 2116. It can be understood that the convex portion 2112 is formed by the first top plate 211 of the magnetic yoke 21 being recessed from the side facing the support member 4 toward the direction away from the support member 4, so that the side of the first top plate 211 facing the central magnetic portion 22 protrudes to form the convex portion 2112, that is, it is formed by stamping or stretching, and is not limited herein.

[0111] It can be understood that by setting the first through hole 2111 to penetrate through the support portion 2113 and the inclined surface 2116 in sequence, the opening area of the first through hole 2111 is further increased, ensuring the smooth flow of the air flow below the second diaphragm 32, improving the high-frequency performance of the second diaphragm 32, and at the same time ensuring the magnet volume of the central magnetic portion 22, thereby ensuring the magnetic field strength. Optionally, there are multiple first through holes 2111, and the multiple first through holes 2111 are arranged at intervals and are arranged around the convex portion 2112.

[0112] In this embodiment, the outer contour of the first top plate 211 and the central magnetic portion 22 can be selected as circular. In order to further increase the opening area of the first through hole 2111, the first through hole 2111 can be selected as an arc-shaped hole extending along the periphery of the convex portion 2112.

[0113] In one embodiment, as Figure 4 , Figure 5 , Figure 7 and Figure 8 shown, the side of the support portion 2113 facing the support member 4 is recessed towards the air flow channel 2114 to form a support groove 2115, and the periphery of the support member 4 is limited within the support groove 2115. It can be understood that by recessing the periphery of the first top plate 211, the side of the support portion 2113 facing the support member 4 is recessed towards the air flow channel 2114 to form a support groove 2115. In this way, the support groove 2115 can be used to position and install the support member 4, improving the installation accuracy.

[0114] Optionally, the first bottom plate 212 is provided with an avoidance groove corresponding to the first magnetic gap 25, and the avoidance groove is used to provide avoidance for the first voice coil 33. It can be understood that the avoidance groove provides an avoidance space for the first voice coil 33, thus improving the performance of the sound generating device 100.

[0115] In one embodiment, as Figures 3 to 6 shown, the central magnetic portion 22 includes a centrally stacked central magnet 221 and a central magnetic conductive plate 222, and the central magnet 221 is connected to the magnetic yoke 21. It can be understood that the central magnet 221 is connected to the first top plate 211 of the magnetic yoke 21, that is, the central magnet 221 is clamped between the first top plate 211 and the central magnetic conductive plate 222, and the outer peripheries of the central magnet 221 and the central magnetic conductive plate 222 are spaced from the first side plate 213 of the magnetic yoke 21 to form a second magnetic gap 26.

[0116] Optionally, the central magnet 221 and the central magnetic conductive plate 222 of the central magnetic portion 22 can be selected as circular plate-shaped or disc-shaped structures, which are not limited herein.

[0117] In one embodiment, as Figures 3 to 6As shown, the edge magnet part 23 includes a stacked edge magnet 231 and an edge magnetic conductive plate 232, and the edge magnet 231 is connected to the magnetic yoke 21. It can be understood that the edge magnet 231 is connected to the first bottom plate 212 of the magnetic yoke 21, that is, the edge magnet 231 is sandwiched between the first bottom plate 212 and the edge magnetic conductive plate 232, and the inner periphery of the edge magnet 231 and the edge magnetic conductive plate 232 are spaced from the first side plate 213 of the magnetic yoke 21 to form a first magnetic gap 25. Optionally, the edge magnet 231 and the edge magnetic conductive plate 232 of the edge magnet part 23 can be selected as a circular ring structure, which is not limited here.

[0118] In order to further improve the connection stability, in this embodiment, the side magnetic conductive plate 232 and the housing 1 are an integrally formed structure. It is understandable that the housing 1 can be made of metal or plastic. When the housing 1 is made of metal, the housing 1 and the side magnetic conductive plate 232 are integrally formed, which can simplify the processing steps and improve the heat dissipation effect. When the housing 1 is made of plastic, the housing 1 and the side magnetic conductive plate 232 can be integrally injection molded, which is not limited here.

[0119] Optionally, the side magnetic conductive plate 232 and the first shell 11 of the outer shell 1 are an integrally formed structure, which is not limited here. In the present embodiment, the side magnetic conductive plate 232 is injection molded on the outer shell 1, and the first leakage hole 111 is formed by removing material from the side magnetic conductive plate 232 and / or the corresponding area of ​​the outer shell 1. It can be understood that the first leakage hole 111 is formed by removing material from the side magnetic conductive plate 232 or the outer shell 1 or from both the side magnetic conductive plate 232 and the outer shell 1, so that the first leakage hole 111 does not occupy the radial dimension of the sound-generating device 100 additionally, or the size of the first leakage hole 111 can be increased within the limited size of the sound-generating device 100 to balance the internal pressure.

[0120] In one embodiment, the support member 4 includes a second top plate 42, a second side plate 43 arranged on the periphery of the second top plate 42, and a second bottom plate 44 formed by extending outward from one end of the second side plate 43 away from the second top plate 42, and the second bottom plate 44 is connected to the side of the magnetic yoke 21 facing away from the central magnetic portion 22, so that the second top plate 42, the second side plate 43 and the magnetic yoke 21 enclose an airflow cavity 41; wherein the second top plate 42 is provided with a second through hole 421, and the inner periphery of the first diaphragm 31 is connected to the side of the second top plate 42 facing away from the airflow cavity 41, so that the third through hole 314 is connected to the second through hole 421.

[0121] In this embodiment, if Figures 3 to 6 , Figure 9 and Figure 10As shown, the support member 4 can be an integrally formed structure. The second side plate 43 is provided at the periphery of the second top plate 42 and is arranged at an angle with the second top plate 42, that is, the second side plate 43 and the second top plate 42 enclose a concave cavity. The second bottom plate 44 is connected to one end of the second side plate 43 away from the second top plate 42 and extends in a direction away from the concave cavity, that is, the second bottom plate 44 is arranged at an angle with the second side plate 43. In this way, the support member 4 is connected to the magnetic yoke 21 by the second bottom plate 44, thereby increasing the contact area and improving the connection stability. Moreover, the second side plate 43 of the support member 4 supports the second top plate 42 away from the first top plate 211 of the magnetic yoke 21, so that the second top plate 42, the second side plate 43 and the first top plate 211 of the magnetic yoke 21 enclose an air flow cavity 41, and the inner periphery of the first diaphragm 31 is fixed by the second top plate 42 of the support member 4.

[0122] Optionally, the support member 4 is a metal member, and the second bottom plate 44 is adhesively connected or welded to the magnetic yoke 21.

[0123] It can be understood that the second top plate 42 of the support member 4 is provided with a second through hole 421, so that the air flow cavity 41 communicates with the outside through the second through hole 421 and the third through hole 314 of the first diaphragm 31. In this embodiment, the third through hole 314 of the first diaphragm 31 can be one or more. When the third through hole 314 is one, that is, the first diaphragm 31 is an annular diaphragm, at this time, the inner periphery of the first diaphragm 31 forms the third through hole 314, that is, the second through hole 421 of the second top plate 42 is located within the projection range of the third through hole 314 on the second top plate 42. When the third through hole 314 is multiple, at this time, the inner side of the first diaphragm 31 is flat and is attached to the second top plate 42. The inner side of the first diaphragm 31 is provided with multiple third through holes 314, and at least part of the multiple third through holes 314 corresponds to and communicates with the second through hole 421, which is not limited herein.

[0124] Optionally, the second through hole 421 is one, and the second through hole 421 corresponds to and communicates with the third through hole 314; or, the second through hole 421 includes multiple ones, and the multiple second through holes 421 are arranged at intervals.

[0125] It should be noted that when the second top plate 42 is provided with multiple second through holes 421 and the inner side of the first diaphragm 31 is provided with multiple third through holes 314, optionally, the multiple second through holes 421 are arranged in one-to-one correspondence with the multiple third through holes 314, which is not limited herein.

[0126] In an embodiment, the area of the second top plate 42 is defined as S3, and the opening area of the second through hole 421 is defined as S4, and S4 = (10% - 80%)S3.

[0127] In this embodiment, by controlling the opening area of the second through-hole 421 on the second top plate 42, it is beneficial for the sound waves of the second diaphragm 32 to radiate to the outside, and it can ensure the structural strength of the support member 4 and the connection area between the inner edge of the first diaphragm 31 and the second top plate 42, thereby improving the stability. Optionally, the opening area S4 of the second through-hole 421 accounts for 10% to 80% of the area S3 of the second top plate 42. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 85%, etc., which are not limited herein.

[0128] It can be understood that if the area of the second through-hole 421 is too small, it is not conducive to the sound waves of the second diaphragm 32 radiating to the outside; if the area of the second through-hole 421 is too large, the bonding area between the first diaphragm 31 and the second top plate 42 is too small, which is not conducive to improving the connection reliability between the two.

[0129] It should be noted that when there is one second through-hole 421, the opening area S4 of the second through-hole 421 is the opening area of one second through-hole 421. When there are multiple second through-holes 421, the opening area S4 of the second through-holes 421 is the sum of the opening areas of multiple second through-holes 421.

[0130] In one embodiment, as Figures 3 to 6 shown, the first diaphragm 31 includes an inner folding ring 311, a vibrating portion 312, and an outer folding ring 313 connected in sequence. A third through-hole 314 is provided on the inner side of the inner folding ring 311 and is connected to the support member 4. The outer side of the outer folding ring 313 is connected to the housing 1, and the first voice coil 33 is connected to the vibrating portion 312. It can be understood that by setting the first diaphragm 31 as a double-folding ring structure, while facilitating the first voice coil 33 to drive the first diaphragm 31 to vibrate when vibrating, the compliance of the first diaphragm 31 is improved, and its high-frequency performance is improved.

[0131] It can be understood that the inner side of the inner folding ring 311 of the first diaphragm 31 can be an annular structure or a flat structure. When the inner side of the inner folding ring 311 is an annular structure, a third through-hole 314 is formed on the inner side of the inner folding ring 311; when the inner side of the inner folding ring 311 is a flat structure, a third through-hole 314 is provided on the flat structure, which is not limited herein.

[0132] In this embodiment, the inner folding ring 311 and the outer folding ring 313 of the first diaphragm 31 are convex structures protruding upward or concave structures recessed downward, which are not limited herein. It can be understood that the inner folding ring 311 of the first diaphragm 31 protrudes in a direction away from the support member 4, so as to avoid interference from the support member 4 when the first diaphragm 31 vibrates. Optionally, both the inner folding ring 311 and the outer folding ring 313 of the first diaphragm 31 protrude in a direction away from the magnetic circuit system 2.

[0133] Optionally, the inner folding ring 311, the vibrating part 312, and the outer folding ring 313 of the first diaphragm 31 are of an integrally formed structure, which can simplify the processing steps of the first diaphragm 31 and improve the structural strength of the first diaphragm 31.

[0134] In an embodiment, as Figures 3 to 6 shown, the first diaphragm 31 further includes a vibrating plate 315, and the vibrating plate 315 is disposed between the vibrating part 312 and the first voice coil 33. It can be understood that by providing the vibrating plate 315, the structural strength of the first diaphragm 31 is enhanced, the acoustic performance of the first diaphragm 31 is improved, and the first diaphragm 31 is prevented from being torn when the first voice coil 33 vibrates.

[0135] In an embodiment, the second diaphragm 32 includes a folding ring part 321 and a reinforcing part 322. The folding ring part 321 surrounds the reinforcing part 322. The outer edge of the folding ring part 321 is connected to the housing 1, and the second voice coil 34 is connected to the reinforcing part 322.

[0136] In this embodiment, as Figures 2 to 6 shown, the folding ring part 321 and the reinforcing part 322 of the second diaphragm 32 can be of an integrally formed structure or can be separately provided, which is not limited herein. It can be understood that the folding ring part 321 of the second diaphragm 32 is a convex structure protruding upward or a concave structure recessed downward, which is not limited herein. Optionally, the folding ring part 321 protrudes in a direction away from the magnetic circuit system 2.

[0137] It can be understood that the outer edge of the folding ring part 321 is connected to the housing 1, and the second voice coil 34 is connected to the reinforcing part 322. In this way, when the second voice coil 34 vibrates, it drives the second diaphragm 32 to vibrate, so that the sound wave of the second diaphragm 32 radiates outward along the second magnetic gap 26, the air flow channel 2114, the first through hole 2111, the air flow cavity 41, the second through hole 421, and the third through hole 314.

[0138] In an embodiment, as Figures 3 to 6 shown, the sound generating device 100 further includes a first positioning ring 51, and the first positioning ring 51 is disposed between the outer peripheral edge of the first diaphragm 31 and the housing 1. Optionally, the first positioning ring 51 can be a steel ring. By using the first positioning ring 51 between the outer peripheral edge of the outer folding ring 313 of the first diaphragm 31 and the housing 1, the first diaphragm 31 is convenient to handle during the assembly process, and at the same time, the assembly accuracy is improved, and the performance of the sound generating device 100 is improved.

[0139] In an embodiment, as Figures 3 to 6As shown, the sound generating device 100 further includes a second positioning ring 52 disposed between the outer peripheral edge of the second diaphragm 32 and the housing 1. Optionally, the second positioning ring 52 may be a steel ring. By using the second positioning ring 52 between the outer peripheral edge of the folded edge portion 321 of the second diaphragm 32 and the housing 1, the second diaphragm 32 is convenient to pick up 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.

[0140] In one embodiment, the sound generating device 100 further includes a front cover 7 located on the side of the first diaphragm 31 away from the second diaphragm 32. A second cavity 71 is formed between the first diaphragm 31 and the front cover 7. The front cover 7 is provided with a fourth through hole 72 communicating the second cavity 71 with the outside. The sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 are radiated to the outside through the fourth through hole 72.

[0141] In this embodiment, as Figure 1 , Figures 3 to 6 shown, by providing the front cover 7, on the one hand, the first diaphragm 31 is protected by the front cover 7, and on the other hand, the second cavity 71 is formed between the front cover 7 and the first diaphragm 31 to ensure the amplitude of the first diaphragm 31. It can be understood that by providing the fourth through hole 72 in the front cover 7, the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 can conveniently radiate to the outside through the fourth through hole 72.

[0142] Optionally, the front cover 7 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 also reduces the occupation of the overall size of the machine. In a specific application, a suitable number of fourth through holes 72 are set according to the actual situation, and it is not limited to a fixed number. Preferably, a damping member or a breathable film, etc. is provided on the fourth through hole 72, which can further adjust the air flow velocity in the second cavity 71 and adjust the acoustic resistance of the second cavity 71.

[0143] In one embodiment, the magnetic circuit system 2 further includes a first magnet 24 disposed in the air flow cavity 41 for assisting in increasing the number of magnetic induction lines passing through the magnetic yoke 21.

[0144] In this embodiment, as Figure 5 and Figure 6 shown, by providing the first magnet 24 in the air flow cavity 41, the first magnet 24 cooperates with the central magnetic portion 22 to effectively enhance the magnetic field strength of the magnetic circuit system 2, thereby increasing the BL value. At the same time, the first top plate 211 of the magnetic yoke 21 and / or the second top plate 42 of the support member 4 can be used to improve the installation stability of the first magnet 24. It should be noted that both the first magnet 24 and the magnet of the central magnetic portion 22 are magnetized along the vibration direction of the vibration system 3 and the magnetization directions are opposite.

[0145] Optionally, the projected area of the first magnet 24 along the vibration direction of the vibration system 3 is smaller than the area of the convex portion 2112 of the first top plate 211 of the magnetic yoke 21. In this way, the installation stability can be improved, and the sound waves radiated by the first through hole 2111 on the magnetic yoke 21 to the second diaphragm 32 are not affected.

[0146] In this embodiment, the opposite sides of the first magnet 24 are respectively connected to the magnetic yoke 21 and the support member 4. In this way, the connection stability between the first magnet 24 and the support member 4 can be further improved, thereby enhancing the reliability.

[0147] Optionally, there are a plurality of first through holes 2111, and the plurality of first through holes 2111 are arranged at intervals and surround the first magnet 24. Optionally, there are a plurality of second through holes 421, and the plurality of second through holes 421 are arranged at intervals and surround the first magnet 24.

[0148] By setting the magnetic yoke 21 of the magnetic circuit system 2 of the sound generating device 100 of the present invention as a reverse bending structure, the bonding area of the central magnetic portion 22 can be increased, the reliability risk can be reduced, and the area of the first through hole 211 on the magnetic yoke 21 can be increased, thereby improving the high-frequency performance.

[0149] As Figure 11 shown, the present invention also proposes an electronic device 900, and the electronic device 900 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.

[0150] In one embodiment, the electronic device 900 further includes a device housing 800. The device housing 800 is provided with a receiving cavity 810. The sound generating device 100 is disposed in the receiving cavity 810 and divides the receiving cavity 810 into a mutually isolated front cavity 840 and a rear cavity 850. The first side of the first diaphragm 31 and the second diaphragm 32 communicates with the front cavity 840; wherein, the device housing 800 is provided with a sound outlet hole 820 communicating with the front cavity 840, and 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 840 and the sound outlet hole 820.

[0151] In this embodiment, the device housing 800 may be a metal housing or a plastic housing, which is not limited herein. The device housing 800 may be an integrally formed structure or a split structure, which is not limited herein. Optionally, the device housing 800 includes an upper shell and a lower shell, and the upper shell and the lower shell may be adhesively connected or welded to enclose and form the receiving cavity 810.

[0152] Optionally, the outer contour of the device housing 800 may be a square structure. In specific applications, other suitable shapes such as a circle can be selected according to the actual situation, and it is not limited to a specific shape.

[0153] It can be understood that an acoustic outlet hole 820 communicating with the front cavity 840 is provided on the upper shell of the device housing 800, 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 840 and the acoustic outlet hole 820.

[0154] In this embodiment, the first cavity 13 of the sound generating device 100 communicates with the rear cavity 850 through a first leakage hole 111, and the second side of the second diaphragm 32 communicates with the rear cavity 850. In an embodiment, the device housing 800 is further provided with a second leakage hole 830 communicating with the rear cavity 850. 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 840 to the rear cavity 850, and the sound waves in the rear cavity 850 are radiated to the outside through the second leakage hole 830.

[0155] It can be understood that as Figure 11 shown, a second leakage hole 830 is provided on the lower shell of the device housing 800. The second leakage hole 830 communicates with the rear cavity 850 and is used to adjust the pressure in the rear cavity 850 and further adjust the air pressure in the first cavity 13. At the same time, the sound waves in the rear cavity 850 are radiated to the outside through the second leakage hole 830. The sound waves in the rear cavity 850 are opposite in phase to the sound waves in the front cavity 840, which can play the role of a sound dipole and achieve the technical effects of far-field noise cancellation and protecting user privacy. Optionally, a damping member for adjusting the acoustic resistance is provided on the second leakage hole 830.

[0156] In this embodiment, the second leakage hole 830 may be selected as a round hole, an oval hole or a polygonal hole, etc., which is not limited herein. The number of the second leakage holes 830 may be one or more, which is specifically designed according to actual applications and is not limited herein.

[0157] 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 electronic device housing, that is, the device housing 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 acoustic outlet hole is provided on the top wall or the connection area between the side wall and the top wall, and the second leakage hole is provided on the side wall or the bottom wall or the connection area between the side wall and the bottom wall. In this way, the acoustic performance of the electronic device 900 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.

[0158] The above are only alternative embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: shell; A magnetic circuit system, the magnetic circuit system is connected to the housing, the magnetic circuit system comprises a central magnetic part, a side magnetic part and a magnetic yoke connecting the central magnetic part and the side magnetic part, a first magnetic gap is formed between the side magnetic part and the magnetic yoke, a second magnetic gap is formed between the central magnetic part and the magnetic yoke, and the first magnetic gap is arranged around the second magnetic gap; a support member, the support member being arranged on a side of the magnetic yoke facing away from the central magnetic portion and enclosing an airflow cavity with the magnetic yoke, the magnetic yoke being provided with a first through hole connecting the second magnetic gap and the airflow cavity, and the support member being provided with a second through hole connecting the airflow cavity; and A vibration system, the vibration system comprising a first diaphragm, a second diaphragm, a first voice coil and a second voice coil, the outer periphery of the first diaphragm is connected to the housing, the inner periphery of the first diaphragm is connected to the support, and the inner periphery of the first diaphragm is provided with a third through hole communicating with the second through hole, the outer periphery of the second diaphragm is connected to the housing, and is opposite to and spaced from the magnetic circuit system, and the first diaphragm and the second diaphragm are located on opposite sides of the magnetic circuit system, one end of the first voice coil is connected to the first diaphragm, and the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected to the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap; The sound waves on the first side of the second diaphragm are radiated outward through the first through hole, the air flow cavity, the second through hole and the third through hole, and are radiated outward on the same side of the sound-generating device together with the sound waves on the first side of the first diaphragm.

2. The sound generating device according to claim 1, characterized in that: The magnetic yoke comprises a first top plate, a first bottom plate and a first side plate connecting the first top plate and the first bottom plate, the first bottom plate is connected to the housing, the central magnetic part is arranged on the first top plate and is spaced apart from the first side plate to enclose the second magnetic gap, and the edge magnetic part is arranged on the first bottom plate and is spaced apart from the first side plate to enclose the first magnetic gap; The first top plate is provided with the first through hole, and the support member is provided on a side of the first top plate facing away from the central magnetic part, and is enclosed with the first top plate to form the airflow cavity.

3. The sound-generating device according to claim 2, characterized in that: The first top plate includes a protruding portion and a supporting portion connected to each other, wherein the protruding portion is formed by the first top plate protruding toward the central magnetic portion, so that the supporting portion is arranged around the protruding portion; Among them, the support part is provided with the first through hole, the central magnetic part is provided on the protruding part, and is spaced from the support part to enclose and form an airflow channel, the airflow channel connects the second magnetic gap and the first through hole, and the support member is connected to the side of the support part facing away from the airflow channel.

4. The sound-generating device according to claim 3, characterized in that: A side of the support portion facing the support member is recessed toward the airflow channel to form a support groove, and the periphery of the support member is confined within the support groove; And / or, an inclined surface is formed at a connection between the protruding portion and the supporting portion, and the first through hole sequentially passes through the supporting portion and the inclined surface; And / or, the first through hole comprises a plurality of holes, the plurality of first through holes are arranged at intervals and surround the protruding portion; And / or, the first through hole is an arc-shaped hole extending along the periphery of the raised portion; And / or, the first bottom plate is provided with an avoidance groove corresponding to the first magnetic gap, and the avoidance groove is used to provide avoidance for the first voice coil; And / or, 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 area of ​​the first top plate is defined as S1, the opening area of ​​the first through hole is defined as S2, and S2 = (10% to 80%) S1.

5. The sound generating device according to claim 1, characterized in that: The support member includes a second top plate, a second side plate arranged 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, wherein 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 the airflow cavity; The second through hole is provided on the second top plate, and the inner periphery of the first diaphragm is connected to the side of the second top plate facing away from the airflow cavity, so that the third through hole is connected to the second through hole.

6. The sound generating device according to claim 5, characterized in that: There is one second through hole, and the second through hole is connected to the third through hole correspondingly; 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, the area of ​​the second top plate is defined as S3, the opening area of ​​the second through hole is defined as S4, S4 = (10% to 80%) S3; And / or, the support member is a metal member, and the second base plate is bonded or welded to the magnetic yoke; or, the support member is an injection-molded member, and the support member and the magnetic yoke are integrally injection-molded.

7. The sound generating device according to claim 1, characterized in that: The first diaphragm includes an inner folding ring, a vibration part and an outer folding ring which are connected in sequence. The inner side of the inner folding ring is provided with the third through hole and is connected to the support member. The outer side of the outer folding ring is connected to the outer shell. The first voice coil is connected to the vibration part.

8. The sound generating device according to claim 7, characterized in that: The first diaphragm further comprises a vibration plate, and the vibration plate is arranged between the vibration part and the first voice coil; And / or, the second diaphragm includes a folding ring portion and a reinforcement portion, the folding ring portion is arranged around the reinforcement portion, the outer edge of the folding ring portion is connected to the housing, and the second voice coil is connected to the reinforcement portion; And / or, the outer shell includes a first shell and a second shell connected to each other, an end of the first shell away from the second shell is connected to the outer side of the first diaphragm, the side of the second shell facing away from the first shell is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the side of the second shell facing away from the second diaphragm.

9. The sound generating device according to claim 1, characterized in that: The first diaphragm and the second diaphragm vibrate in the same direction, the first sides of the first diaphragm and the second diaphragm radiate the first sound wave to the external environment, the second sides of the first diaphragm and the second diaphragm radiate the second sound wave to the external environment, and the first sound wave and the second sound wave are in opposite phases; Alternatively, the sound-generating device is applied to an electronic device and is used to separate the space of the electronic device into a front cavity and a rear cavity that are acoustically isolated, the first sides of the first diaphragm and the second diaphragm are connected to the front cavity, the second sides of the first diaphragm and the second diaphragm are connected to the rear cavity, the first diaphragm and the second diaphragm vibrate in the same direction and 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 in opposite phases; And / or, the first diaphragm is annular, the inner edge of the first diaphragm forms the third through hole, and the sound-generating device further comprises a first air-permeable member, the first air-permeable member is connected to the inner edge of the first diaphragm and covers the third through hole; And / or, a first cavity is formed between the first diaphragm, the outer shell, the magnetic yoke and the support member, the sound-emitting device is provided with a first leakage hole connecting the first cavity with the outside, and the sound-emitting device also includes a second air-permeable member covering the first leakage hole.

10. The sound generating device according to claim 1, characterized in that: The central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked, and the central magnet is connected to the magnetic conductive yoke; And / or, the edge magnetic part comprises a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate and the housing are an integrally formed structure; And / or, the sound-generating device further comprises a first positioning ring, wherein the first positioning ring is arranged between the outer periphery of the first diaphragm and the housing; And / or, the sound-generating device further comprises a second positioning ring, wherein the second positioning ring is arranged between the outer periphery of the second diaphragm and the housing; And / or, the sound-emitting device also includes a front cover, which is located on the side of the first diaphragm 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 fourth through hole connecting the second cavity and the outside, and the sound waves of the first diaphragm and the second diaphragm are radiated to the outside through the fourth through hole.

11. The sound generating device according to any one of claims 1 to 10, characterized in that: The magnetic circuit system also includes a first magnet disposed in the airflow cavity, and the first magnet is used to assist in increasing the number of magnetic flux lines passing through the magnetic yoke.

12. The sound generating device according to claim 11, characterized in that: The opposite sides of the first magnet are respectively connected to the magnetic yoke and the support member; Wherein, the first through holes include a plurality of holes, and the plurality of the first through holes are spaced apart and arranged around the first magnet; and / or the second through holes include a plurality of holes, and the plurality of the second through holes are spaced apart and arranged around the first magnet.

13. An electronic device, characterized in that: The electronic device comprises: A device housing, wherein the device housing is provided with a receiving cavity; and The sound-generating device according to any one of claims 1 to 12, wherein the sound-generating device is disposed in the receiving cavity, and the receiving cavity is divided into a front cavity and a rear cavity isolated from each other, and the first sides of the first diaphragm and the second diaphragm are connected to the front cavity; The device housing is provided with a sound outlet hole connected to the front cavity, and the sound waves of the first side of the first diaphragm and the second diaphragm of the sound-generating device are radiated to the outside through the front cavity and the sound outlet hole.

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

15. The electronic device according to claim 14, characterized in that: The device housing comprises a top wall and a bottom wall arranged opposite to each other and a side wall connecting the top wall and the bottom wall, wherein: The sound outlet hole is arranged on the top wall or the connecting area between the side wall and the top wall, and the second leakage hole is arranged on the side wall or the bottom wall or the connecting area between the side wall and the bottom wall.

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