Sound production device and electronic equipment

Abstract

The utility model discloses a sounding device and an electronic device, and relates to the technical field of electroacoustic transduction, a first magnetic gap is formed between a side magnetic part of a magnetic circuit system of the sounding device and a magnetic conductive yoke, a second magnetic gap is formed between a central magnetic part and the magnetic conductive yoke, and a support member is arranged on one side of the magnetic conductive yoke opposite to the central magnetic part. A first through hole communicated with the second magnetic gap and the airflow cavity is formed in the magnetic conductive yoke, a second through hole communicated with the airflow cavity is formed in the supporting piece, 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 a third through hole communicated with the second through hole is formed in the first vibrating diaphragm. 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. The sounding device not only improves the high-frequency performance, but also increases the vibration area of the vibration system, thereby improving the performance and effect of the whole machine.

Description

TECHNICAL FIELD

[0001] The utility model relates to electroacoustic transduction technical field, especially a kind of sound production device and the electronic equipment of application this sound production device. BACKGROUND

[0002] In recent years, with the rapid development of consumer electronics, earphone, smart phone, VR equipment and other electronic equipment are recognized by consumers, and are widely used. Related supporting products such as earphones and the like are also improved by those skilled in the art to meet the performance requirements of electronic products and meet the needs of consumers for product performance.

[0003] The sound production device is an important electroacoustic transduction component in consumer electronics, which is widely used as a loudspeaker, a receiver, an earphone, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound production device is also an inevitable trend. In related technologies, in order to improve the performance of the sound production device, the product design is more and more extreme, and the space utilization rate is also higher and higher, which leads to the risk of product reliability, and is not conducive to the improvement of high-frequency performance, resulting in poor performance and effect of the whole machine. SUMMARY

[0004] The main purpose of the utility model is to provide a sound production device and electronic equipment, which aims to provide a sound production device that effectively improves high-frequency performance. The sound production device not only reduces the risk of reliability, but also effectively improves high-frequency performance, thereby improving the performance and effect of the whole machine.

[0005] To achieve the above purpose, the utility model provides a sound production device, which comprises:

[0006] A shell;

[0007] A magnetic circuit system connected with the shell, the magnetic circuit system comprising a center magnetic part, a side magnetic part and a magnetic yoke connecting the center magnetic part and the side magnetic part, a first magnetic gap being formed between the side magnetic part and the magnetic yoke, a second magnetic gap being formed between the center magnetic part and the magnetic yoke, and the first magnetic gap being arranged around the second magnetic gap;

[0008] A support arranged on the side of the magnetic yoke away from the center magnetic part and enclosing the magnetic yoke to form an air flow cavity, the magnetic yoke being provided with a first through hole communicating with the second magnetic gap and the air flow cavity, and the support being provided with a second through hole communicating with the air flow cavity; and

[0009] A vibration system comprises a first diaphragm, a second diaphragm, a first voice coil and a second voice coil, an outer periphery of the first diaphragm is connected with the housing, an inner periphery of the first diaphragm is connected with the support, and the inner periphery of the first diaphragm is provided with a third through hole communicating with the second through hole, an outer periphery of the second diaphragm is connected with 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 with the first diaphragm, the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected with the second diaphragm, and the other end of the second voice coil is suspended in the second magnetic gap;

[0010] The sound waves on the first side of the second diaphragm are radiated outward through the first through hole, the airflow cavity, the second through hole and the third through hole, and the sound waves on the first side of the first diaphragm are radiated outward on the same side of the sound generating device.

[0011] In an embodiment, 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 from the first side plate to form the second magnetic gap, and the side magnetic part is arranged on the first bottom plate and is spaced from the first side plate to form the first magnetic gap.

[0012] The first top plate is provided with the first through hole, and the support is arranged on a side of the first top plate away from the central magnetic part and forms the airflow cavity with the first top plate.

[0013] In an embodiment, the first top plate comprises a protruding part and a supporting part connected with each other, the protruding part is formed by the first top plate protruding towards the central magnetic part so that the supporting part is arranged around the protruding part.

[0014] The supporting part is provided with the first through hole, the central magnetic part is arranged on the protruding part and is spaced from the supporting part to form an airflow passage, the airflow passage communicates the second magnetic gap and the first through hole, and the support is connected to a side of the supporting part away from the airflow passage.

[0015] In an embodiment, a side of the supporting part facing the support is recessed towards the airflow passage to form a supporting groove, and a periphery of the support is limited in the supporting groove.

[0016] Furthermore, a connecting part of the protruding part and the supporting part forms an inclined surface, and the first through hole penetrates the supporting part and the inclined surface in sequence.

[0017] And / or, the first through hole includes a plurality of first through holes, and the plurality of first through holes are arranged at intervals and surround the protruding portion;

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

[0019] And / or, the first bottom plate is provided with a recess corresponding to the first magnetic gap, and the recess is used to provide a recess 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 in the vibration direction of the vibration system.

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

[0022] In an embodiment, the support 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, and the second bottom plate is connected to the side of the magnetic yoke away from the center magnetic portion, so that the second top plate, the second side plate and the magnetic yoke form the airflow cavity.

[0023] Wherein, the second top plate is provided with the second through hole, and the inner periphery of the first diaphragm is connected to the side of the second top plate away from the airflow cavity, so that the third through hole and the second through hole are in communication.

[0024] In an embodiment, the second through hole is one, and the second through hole and the third through hole are in communication; or, the second through hole includes a plurality of second through holes, and the plurality of second through holes are arranged at intervals.

[0025] And / or, the area of the second top plate is defined as S3, and the opening area of the second through hole is defined as S4, S4 = (10% ~ 80%) S3.

[0026] And / or, the support is a metal piece, and the second bottom plate and the magnetic yoke are adhesively connected or welded; or, the support is an injection molded piece, and the support and the magnetic yoke are integrally injection molded.

[0027] In an embodiment, the first diaphragm includes an inner folding ring, a vibration portion and an outer folding ring connected in sequence, the inner side of the inner folding ring is provided with the third through hole and connected with the support, the outer side of the outer folding ring is connected with the shell, and the first voice coil is connected with the vibration portion.

[0028] In an embodiment, the first diaphragm further includes a vibration plate arranged between the vibration portion and the first voice coil.

[0029] And / or, the second vibrating diaphragm comprises a folded ring portion and a reinforcing portion, the folded ring portion is arranged around the reinforcing portion, an outer edge of the folded ring portion is connected with the outer shell, and the second voice coil is connected with the reinforcing portion;

[0030] And / or, the outer shell comprises a first shell and a second shell connected with each other, one end of the first shell away from the second shell is connected with the outer side of the first vibrating diaphragm, and the side of the second shell away from the first shell is connected with the outer periphery of the second vibrating diaphragm, and the outer periphery of the magnetic yoke is connected with the side of the second shell away from the second vibrating diaphragm.

[0031] In an embodiment, the first vibrating diaphragm and the second vibrating diaphragm vibrate in the same direction, the first side of the first vibrating diaphragm and the second vibrating diaphragm radiate the first sound wave to the external environment, the second side of the first vibrating diaphragm and the second vibrating diaphragm radiate the second sound wave to the external environment, and the first sound wave and the second sound wave are opposite in 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 vibrating diaphragm and the second vibrating diaphragm is communicated with the front cavity, the second side of the first vibrating diaphragm and the second vibrating diaphragm is communicated with the rear cavity, the first vibrating diaphragm and the second vibrating diaphragm vibrate in the same direction, radiate the first sound wave to the front cavity, and radiate the second sound wave to the rear cavity, and the first sound wave and the second sound wave are opposite in phase;

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

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

[0035] In an embodiment, the center magnetic portion comprises a center magnet and a center magnetic guide plate arranged in layers, and the center magnet is connected to the magnetic yoke;

[0036] And / or, the edge magnetic portion comprises an edge magnet and an edge magnetic guide plate arranged in layers, the edge magnet is connected with the magnetic yoke, and the edge magnetic guide plate is an integral molding structure with the outer shell;

[0037] And / or, the sound generating device further comprises a first positioning ring arranged between the outer periphery of the first vibrating diaphragm and the outer shell;

[0038] And / or, the sound production device further comprises a second positioning ring, which is arranged between the outer periphery of the second diaphragm and the shell.

[0039] And / or, the sound production device further comprises a front cover, which is located on the side of the first diaphragm away from the second diaphragm, and 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 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.

[0040] In an embodiment, the magnetic circuit system further comprises a first magnet arranged 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.

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

[0042] Wherein, the first through hole comprises a plurality of first through holes, and the plurality of first through holes are arranged around the first magnet; and / or, the second through hole comprises a plurality of second through holes, and the plurality of second through holes are arranged around the first magnet.

[0043] The utility model also proposes a kind of electronic equipment, and the electronic equipment includes:

[0044] Device shell, the device shell is equipped with receiving cavity;And

[0045] The sound production device described above is arranged in the receiving cavity, and the receiving cavity is divided into front cavity and rear cavity isolated from each other, and the first side of the first diaphragm and the second diaphragm is communicated with the front cavity.

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

[0047] In an embodiment, the device shell is further provided with second leakage hole, and the second leakage hole is communicated with the rear cavity.

[0048] The first diaphragm and the second diaphragm radiate sound waves with opposite phase to 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.

[0049] In an embodiment, the device shell comprises oppositely arranged top wall and bottom wall and side wall connecting the top wall and the bottom wall, wherein,

[0050] The sound outlet hole is arranged on the top wall or the connecting area of 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 of the side wall and the bottom wall.

[0051] The sound generating device of the utility model technical scheme, by the magnetic circuit system and the vibration system are housed in the shell, and the first magnetic gap and the second magnetic gap are arranged on the magnetic circuit system, so that the first magnetic gap is arranged around the second magnetic gap, and the vibration system is arranged as the first diaphragm, the second diaphragm, the first voice coil and the second voice coil, so that the first diaphragm and the second diaphragm are arranged on the opposite sides of the magnetic circuit system respectively and connected with the shell, and one end of the first voice coil is connected with the first diaphragm, the other end of the first voice coil is suspended in the first magnetic gap, one end of the second voice coil is connected with 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, so that the current is passed through the first voice coil and the second voice coil, so that the first voice coil and the second voice coil convert the electric energy into mechanical energy in the first magnetic gap and the second magnetic gap formed by the magnetic circuit system respectively, 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 to drive two voice coils to drive two diaphragms to vibrate to realize sound generation, but also to realize the same direction sound generation of double diaphragms without increasing the size of the shell, and the vibration area of the vibration system is increased, so as to achieve the purpose of performance improvement; further, by arranging the magnetic circuit system as the center magnetic part, the edge magnetic part and the magnetic yoke connecting the center magnetic part and the edge magnetic part, the first magnetic gap is formed between the edge magnetic part and the magnetic yoke, the second magnetic gap is formed between the center magnetic part and the magnetic yoke, and the support is arranged on the side of the magnetic yoke away from the center magnetic part, so as to connect and fix the inner periphery of the first diaphragm by the support, and the air flow cavity is formed by the support and the magnetic yoke, and the first through hole communicating the second magnetic gap and the air flow cavity is arranged on the magnetic yoke, the second through hole communicating the air flow cavity is arranged on the support, and the third through hole communicating the second through hole is arranged on the inner periphery of the first diaphragm, so that the sound waves on the first side of the second diaphragm pass through the first through hole, the air flow cavity, the second through hole and the third through hole in sequence to radiate sound waves outward, so that the sound waves on the first side of the first diaphragm and the second diaphragm are 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 center magnetic part are respectively installed and fixed by the support and the magnetic yoke to improve the installation stability, so as to reduce the reliability risk, and the air flow circulation area when the second diaphragm vibrates is effectively increased by 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 that the air flow circulation is more smooth, improve the high frequency performance of the second diaphragm, and improve the high frequency performance of the superimposed first diaphragm and second diaphragm. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0053] Figure 1 The structural schematic diagram of an embodiment of the sound generating device provided by the present application is shown in the figure.

[0054] Figure 2 The structural schematic diagram of another view of an embodiment of the sound generating device provided by the present application is shown in the figure.

[0055] Figure 3 The exploded schematic diagram of an embodiment of the sound generating device provided by the present application is shown in the figure.

[0056] Figure 4 The cross-sectional schematic diagram of an embodiment of the sound generating device provided by the present application is shown in the figure.

[0057] Figure 5 The cross-sectional schematic diagram of another embodiment of the sound generating device provided by the present application is shown in the figure.

[0058] Figure 6 The exploded schematic diagram of another embodiment of the sound generating device provided by the present application is shown in the figure.

[0059] Figure 7 The structural schematic diagram of an embodiment of the magnetic conducting yoke provided by the present application is shown in the figure.

[0060] Figure 8 The cross-sectional schematic diagram of an embodiment of the magnetic conducting yoke provided by the present application is shown in the figure.

[0061] Figure 9 The structural schematic diagram of an embodiment of the support provided by the present application is shown in the figure.

[0062] Figure 10 The structural schematic diagram of another embodiment of the support provided by the present application is shown in the figure.

[0063] Figure 11 The structural schematic diagram of an embodiment of the electronic device provided by the present application is shown in the figure.

[0064] Explanation of figure mark:

[0065] 100, sound production device; 1, shell; 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, protruding part; 2113, support part; 2114, air flow channel; 2115, support groove; 2116, inclined surface; 212, first bottom plate; 213, first side plate; 22, center magnetic part; 221, center magnet; 222, center magnetic yoke; 23, edge magnetic part; 231, edge magnet; 232, edge magnetic yoke; 24, first magnet; 25, first magnetic gap; 26, second magnetic gap; 3, vibration system; 31, first diaphragm; 311, inner folding ring; 312, vibration part; 313, outer folding ring; 314, third through hole; 315, vibration plate; 32, second diaphragm; 321, folding ring part; 322, reinforcing part; 33, first voice coil; 34, second voice coil; 4, support piece; 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 piece; 62, second air permeable piece; 7, front cover; 71, second cavity; 72, fourth through hole; 800, equipment shell; 810, accommodating cavity; 820, sound outlet hole; 830, second leakage hole; 840, front cavity; 850, rear cavity; 900, electronic equipment.

[0066] The realization, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0068] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0069] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that three schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0070] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0071] In recent years, with the rapid development of consumer electronics, earphones, smart phones, VR devices and other electronic devices have been recognized by consumers and widely used. The related supporting products such as earphones and the like have also been improved by those skilled in the art to meet the performance requirements of electronic products and meet the needs of consumers for product performance.

[0072] The sound generating device is an important electro-acoustic transduction component in consumer electronics, which is widely used as a loudspeaker, a receiver, an earphone, etc. With the improvement of the performance of electronic products, the improvement of the acoustic performance of the sound generating device is also an inevitable trend. In particular, the requirements of OWS (Open Wearable Stereo, full open wearable earphone) Bluetooth earphone are different from TWS (True Wireless Stereo, true wireless stereo). Because the whole machine is to reflect the convenience and comfort of wearing, the non-ear method is adopted, so the performance improvement of the sound generating device is imminent.

[0073] The traditional Driver design is single-sided vibration sound generation. In the cavity of the whole machine with limited internal space, it is difficult to increase the vibration area and vibration displacement, so the performance improvement of the sound generating device is also limited, which cannot meet the needs of existing OWS and other wearable audio products. At the same time, in order to improve the performance of the sound generating device, the product design is more and more limited, and the space utilization rate is also higher and higher, which leads to the risk of product reliability, and is not conducive to the improvement of high frequency performance, resulting in poor performance and effect of the whole machine.

[0074] Based on the above ideas and problems, the present application provides a sound generating device 100. It can be understood that the sound generating device 100 is applied to electronic equipment, which can be a mobile phone, an earphone, a smart wearable device, etc., which is not limited here.

[0075] In the embodiment, the sound generating device 100 is provided with double diaphragms and double voice coil structures, utilizes one magnetic circuit system 2 to drive two diaphragms to vibrate and realize sound generation, realizes double diaphragm sound generation without increasing the size, increases the vibration area of the vibration system 3, and thus the performance is improved, and the double diaphragms radiate sound waves on the same side of the sound generating device 100, which is beneficial to improve the loudness and sensitivity of the sound generating device 100. The supporting member 4 is arranged, the magnetic yoke 21 is arranged in a positive and negative stretching structure, the connection area of the supporting member 4 and the inner edge of the first diaphragm 31 and the connection area of the center magnetic part 22 of the magnetic circuit system 2 and the magnetic yoke 21 are increased, the stability is improved, the reliability risk is reduced, the airflow flow area when the second diaphragm 32 vibrates is effectively increased through the first through hole 2111 of the magnetic yoke 21 and the airflow cavity 41 formed by the magnetic yoke 21 and the supporting member 4, and thus the airflow flow is smoother, the high-frequency performance of the second diaphragm 32 is improved, and thus the high-frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition is improved.

[0076] Please refer to Figures 1 to 10 In the embodiment, the sound generating device 100 is provided with double diaphragms and double voice coil structures, utilizes one magnetic circuit system 2 to drive two diaphragms to vibrate and realize sound generation, realizes double diaphragm sound generation without increasing the size, increases the vibration area of the vibration system 3, and thus the performance is improved, and the double diaphragms radiate sound waves on the same side of the sound generating device 100, which is beneficial to improve the loudness and sensitivity of the sound generating device 100. The supporting member 4 is arranged, the magnetic yoke 21 is arranged in a positive and negative stretching structure, the connection area of the supporting member 4 and the inner edge of the first diaphragm 31 and the connection area of the center magnetic part 22 of the magnetic circuit system 2 and the magnetic yoke 21 are increased, the stability is improved, the reliability risk is reduced, the airflow flow area when the second diaphragm 32 vibrates is effectively increased through the first through hole 2111 of the magnetic yoke 21 and the airflow cavity 41 formed by the magnetic yoke 21 and the supporting member 4, and thus the airflow flow is smoother, the high-frequency performance of the second diaphragm 32 is improved, and thus the high-frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition is improved.

[0077] In the embodiment, the sound generating device 100 can be a sound generating unit of a loudspeaker, and the loudspeaker can be a micro loudspeaker. It should be noted that the magnetic circuit system 2 and the vibration system 3 of the sound generating device 100 are oppositely arranged.

[0078] It can be understood that the shell 1 is used to mount, fix and support the components such as the magnetic circuit system 2 and the vibration system 3, that is, the shell 1 provides a mounting basis for the components such as the magnetic circuit system 2 and the vibration system 3. Alternatively, the shell 1 can be an integral structure or a plurality of split structures cooperatively formed, which is not limited herein. In the embodiment, the shell 1 can be a frame structure, that is, the shell 1 has a cavity with two open ends, the magnetic circuit system 2 is accommodated in the cavity of the shell 1 and connected with the shell 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 periphery of the first diaphragm 31 and the outer periphery of the second diaphragm 32 are respectively connected to the two ends of the shell 1, thereby forming a double-diaphragm structure, so as to drive the two diaphragms of the two voice coil bands of the vibration system 3 to vibrate by using one magnetic circuit system 2 to generate sound, while realizing the same-direction sound generation of the double-diaphragm on the premise of not increasing the size, and increasing the vibration area of the vibration system 3, thereby achieving the purpose of performance improvement.

[0079] In the embodiment, the shell 1 is provided with a conductive terminal, and the first voice coil 33 and the second voice coil 34 are electrically connected with the conductive terminal. In this way, the sound generating device 100 can be conveniently connected with an external circuit through the conductive terminal to realize the conduction of the first voice coil 33 and the second voice coil 34.

[0080] Alternatively, the sound waves of 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. 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 generate sound, thereby improving the sound generating effect and performance. In the embodiment, the first diaphragm 31 and the second diaphragm 32 can be selected to vibrate in the same direction and radiate sound waves of the same phase outward, so as to improve the volume of the sound generating device 100. In the present application, the sound generating device 100 has a first side and a second side which are away from each other, the first side refers to the side of the first diaphragm 31 away from the second diaphragm 32, and the second side refers to the side of the second diaphragm 32 away from the first diaphragm 31. The first side and the second side can be understood as the orientation or direction.

[0081] In the embodiment, the shell 1 is used to accommodate and fix the structures such as the vibration system 3 and the magnetic circuit system 2, so that the sound generating device 100 can be applied as an independent component in an electronic device or a sound generating module, which is not limited herein. It can be understood that the shape of the sound generating device 100 can be circular or square, so that the shape of the shell 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, which is not limited herein.

[0082] Optionally, the shell 1 is in a cylindrical structure, i.e. both ends of the shell 1 have openings, the outer periphery of the first diaphragm 31 and the second diaphragm 32 of the vibration system 3 are substantially flush, and similar to the outer profile of the shell 1, the first diaphragm 31 and the second diaphragm 32 are respectively connected to the openings at both ends of the shell 1, and the magnetic circuit system 2 is arranged in the cavity of the shell 1 and located between the first diaphragm 31 and the second diaphragm 32, so as to facilitate the regular design of the outer shape of the sound generating device 100, and further facilitate the assembly in the whole machine and simplify the reserved structure of the whole machine.

[0083] In the embodiment, as shown in Figures 1 to 6 The shell 1 includes a first shell 11 and a second shell 12 connected together, the first shell 11 is connected to the outer side of the first diaphragm 31 away from the second shell 12, the second shell 12 is connected to the outer periphery of the second diaphragm 32 away from the first shell 11, and the outer periphery of the magnetic yoke 21 is connected to the side of the second shell 12 away from the second diaphragm 32.

[0084] It can be understood that the first shell 11 and the second shell 12 of the shell 1 are optionally in a cylindrical shape, so that the first shell 11 and the second shell 12 are adaptively connected to form the cylindrical shell 1. By designing the shell 1 as the first shell 11 and the second shell 12 arranged separately, the first diaphragm 31 can be assembled by the first shell 11, and the second diaphragm 32 can be assembled by the second shell 12, so as to facilitate the assembly of the sound generating device 100 during the assembly process. In the embodiment, the first shell 11 and the second shell 12 of the shell 1 are respectively provided with conductive terminals, so as to facilitate the electrical connection between the first voice coil 33 and the second voice coil 34 and the external circuit.

[0085] In the embodiment, by setting the magnetic circuit system 2 as the center magnetic part 22, the side magnetic part 23 and the magnetic yoke 21, and installing and fixing the center magnetic part 22 and the side magnetic part 23 by the magnetic yoke 21, the first magnetic gap 25 is formed between the side magnetic part 23 and the magnetic yoke 21, the second magnetic gap 26 is formed between the center magnetic part 22 and the magnetic yoke 21, and the side magnetic part 23 is located outside the center magnetic part 22, so that the first magnetic gap 25 is arranged around the second magnetic gap 26. In this way, the first voice coil 33 and the second voice coil 34 of the vibration system 3 correspond to the first magnetic gap 25 and the second magnetic gap 26 respectively, and the conductive terminal is arranged on the shell 1, so that the first voice coil 33 and the second voice coil 34 are electrically connected with the conductive terminal. In this way, the current is passed through the first voice coil 33 and the second voice coil 34, so that the first voice coil 33 and the second voice coil 34 convert the electric energy into mechanical energy in the first magnetic gap 25 and the second magnetic gap 26 formed by the magnetic circuit system 2 respectively, 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 the sound is generated by driving two voice coils to drive two diaphragms to vibrate by one magnetic circuit system 2, but also the sound is generated by the diaphragms on the same direction without increasing the size of the shell, and the vibration area of the vibration system 3 is increased, so that the performance is improved.

[0086] In order to realize the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 to be radiated outward on the same side of the sound generating device 100 and superimposed to enhance the high frequency performance. In the embodiment, by arranging the support 4 on the side of the magnetic yoke 21 away from the center magnetic part 22, the inner periphery of the first diaphragm 31 is connected and fixed by the support 4, and the air flow cavity 41 is formed by the support 4 and the magnetic yoke 21, and the first through hole 2111 is arranged on the magnetic yoke 21 to communicate the second magnetic gap 26 and the air flow cavity 41, and the second through hole 421 is arranged on the support 4 to communicate the air flow cavity 41, and the third through hole 314 is arranged on the inner periphery of the first diaphragm 31, so that the sound waves on the first side of the second diaphragm 32 are sequentially radiated outward 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 communicated to form an air flow passage, so that the sound waves on the first side of the second diaphragm 32 are conveniently radiated outward through the air flow passage, so that 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, 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 first diaphragm 31 and the center magnetic part 22 are respectively installed and fixed by the support 4 and the magnetic yoke 21 to improve the installation stability, thereby reducing the reliability risk, and the air flow passage area when the second diaphragm 32 vibrates is effectively increased by 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 4, thereby ensuring that the air flow is more smooth, improving the high frequency performance of the second diaphragm 32, thereby improving the high frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition.

[0087] The sound generating device 100 of the utility model through the magnetic circuit system 2 and vibration system 3 are housed in the shell 1, and the first magnetic gap 25 and the second magnetic gap 26 are set on the magnetic circuit system 2, so that the first magnetic gap 25 is set around the second magnetic gap 26, and the vibration system 3 is set as the first diaphragm 31, the second diaphragm 32, the first voice coil 33 and the second voice coil 34, so that the first diaphragm 31 and the second diaphragm 32 are respectively arranged on the opposite sides of the magnetic circuit system 2 and are connected with the shell 1, and one end of the first voice coil 33 is connected with 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 with 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, so that the current is passed in the first voice coil 33 and the second voice coil 34, so that the first voice coil 33 and the second voice coil 34 respectively convert the electric 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, not only through one magnetic circuit system 2 to drive two voice coils to drive two diaphragms to vibrate and realize sound generation, but also realize the same direction sound generation of double-sided diaphragm under the premise of not increasing the size, and increase the vibration area of the vibration system 3, so as to achieve the purpose of performance improvement; further, the magnetic circuit system 2 is set as the center magnetic part 22, the edge magnetic part 23 and the magnetic yoke 21 connecting the center magnetic part 22 and the edge magnetic part 23, so that the first magnetic gap 25 is formed between the edge magnetic part 23 and the magnetic yoke 21, the second magnetic gap 26 is formed between the center magnetic part 22 and the magnetic yoke 21, and the support 4 is arranged on the side of the magnetic yoke 21 away from the center magnetic part 22, so that the inner periphery of the first diaphragm 31 is connected and fixed by the support 4, and the support 4 and the magnetic yoke 21 form the airflow cavity 41, and the first through hole 2111 is arranged on the magnetic yoke 21 and communicates with the second magnetic gap 26 and the airflow cavity 41, the second through hole 421 is arranged on the support 4 and communicates with the airflow cavity 41, and the third through hole 314 is arranged on the inner periphery of the first diaphragm 31 and communicates with the second through hole 421, so that the second diaphragm 32 radiates sound waves outward through the first through hole 2111, the airflow cavity 41, the second through hole 421 and the third through hole 314 in turn, so as to realize the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 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.And respectively install and fix the first diaphragm 31 and the center magnetic part 22 by the support 4 and the magnetic yoke 21, to improve the installation stability, so as to reduce the reliability risk, and effectively increase the air flow circulation area when the second diaphragm 32 vibrates 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 4, so as to ensure that the air flow is more smooth, improve the high frequency performance of the second diaphragm 32, and thus improve the high frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition.

[0088] In the embodiment, the magnetic yoke 21 is a metal magnetic plate. Alternatively, the support 4 is a metal piece. It can be understood that the support 4 and the magnetic yoke 21 can be connected by bonding or welding, which is not limited here. Of course, in other embodiments, the support 4 can be an injection molded part. The support 4 and the magnetic yoke 21 can be integrally injection molded, which is not limited here.

[0089] The sound generating device 100 of the present application can have various application environments in actual application. In an embodiment, the first diaphragm 31 and the second diaphragm 32 can be selected to vibrate in the same direction, the first side of the first diaphragm 31 and the second diaphragm 32 radiates a first sound wave to the external environment, the second side of the first diaphragm 31 and the second diaphragm 32 radiates a second sound wave to the external environment, and the first sound wave and the second sound wave are opposite in phase. In this way, the first side and the second side of the sound generating device 100 are both in communication with the external environment, and the first side and the second side radiate sound waves of opposite phases to the external environment, and the sound waves on both sides are mutually reduced in the far field, which is suitable for environments that require far field sound reduction and privacy protection.

[0090] In an embodiment, the sound generating device 100 is applied to an electronic device, and is used to divide the space of the electronic device into acoustically isolated front and rear cavities, the first side of the first diaphragm 31 and the second diaphragm 32 is in communication with the front cavity, 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, and the first sound wave and the second sound wave are opposite in phase. It can be understood that the electronic device usually has a sound outlet hole for the front cavity sound wave to radiate out, and when the electronic device is used, the front cavity sound wave can be radiated out through the sound outlet hole and received by the user, and further, the rear cavity sound wave can be optionally radiated out through a rear leakage hole (second leakage hole in the present application). In this way, the front and rear cavity sound waves can realize a sound dipole, achieving the technical effect of reducing sound leakage. Alternatively, the rear cavity sound wave can not be radiated out, and the sound generating device of the present application only has the effect of superimposing the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 to enhance the high frequency performance. The selection of use is based on the actual situation.

[0091] In an embodiment, the first diaphragm 31 is annular, and an inner edge of the first diaphragm 31 forms a third through hole 314. The sound production device 100 further comprises a first air permeable member 61 connected to the inner edge of the first diaphragm 31 and covering the third through hole 314.

[0092] In the present embodiment, as shown in Figures 3 to 6 , the first diaphragm 31 can be an annular diaphragm, and an inner edge of the first diaphragm 31 forms the third through hole 314, i.e., the inner edge of the first diaphragm 31 forms a third through hole 314. 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 that the first air permeable member 61 is used to prevent external dust or impurities from entering the inside of the sound production device 100, thereby avoiding affecting the acoustic performance of the sound production device 100.

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

[0094] In the present embodiment, as shown in Figure 4 and Figure 5 , the first diaphragm 31, the housing 1, the magnetic yoke 21, and the support 4 of the vibration system 3 enclose to form the first cavity 13, and the first cavity 13 can be 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 the first leakage hole 111 communicating the first cavity 13 with the outside on the sound production device 100, so that the first leakage hole 111 is used to realize air leakage, adjust the air pressure of 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 comprises a plurality of first leakage holes 111. In the present embodiment, the plurality of first leakage holes 111 are symmetrically arranged along the circumference of the sound production device 100. So that the first leakage hole 111 is used to balance the air pressure of the first cavity 13 and improve the vibration balance of the first diaphragm 31.

[0096] In the present embodiment, by providing the second air permeable member 62 on the first leakage hole 111, the second air permeable member 62 covers the first leakage hole 111, which can prevent external dust or impurities from entering the inside of the sound production device 100, thereby avoiding affecting the acoustic performance of the sound production device 100; on the other hand, it can further adjust the airflow velocity of the first cavity 13, adjust the air pressure of 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 arranged between the first shell 11 and the second shell 12 of the housing 1, and a second air permeable member 62 is arranged in the first leakage hole 111. In this way, the air flow speed in the cavity of the sound generating device 100 can be further adjusted, and the acoustic resistance can be adjusted, so as to improve the performance of the sound generating device 100.

[0098] In an embodiment, the magnetic conducting yoke 21 comprises 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 center magnetic part 22 is arranged on the first top plate 211 and spaced from the first side plate 213 to form the second magnetic gap 26, and the side magnetic part 23 is arranged on the first bottom plate 212 and spaced from the first side plate 213 to form the first magnetic gap 25; wherein the first top plate 211 is provided with a first through hole 2111, and the support 4 is arranged on the side of the first top plate 211 away from the center magnetic part 22 and forms the air flow cavity 41 with the first top plate 211.

[0099] In the present embodiment, as shown in Figures 3 to 8 The magnetic conducting yoke 21 can be optionally formed in one piece, so as to improve the structural strength of the magnetic conducting yoke 21 and improve the installation stability. The first side plate 213 of the magnetic conducting yoke 21 can be optionally arranged around the periphery of the first top plate 211 and arranged at an angle with the first top plate 211, and the first side plate 213 and the first top plate 211 form a containing cavity, the center magnetic part 22 is arranged in the containing cavity and connected to the first top plate 211 and spaced from the first side plate 213 to form the second magnetic gap 26. The first bottom plate 212 can be optionally connected to the end of the first side plate 213 away from the first top plate 211, and the first bottom plate 212 extends away from the containing cavity and is arranged at an angle with the first side plate 213. The side magnetic part 23 is arranged on the first bottom plate 212 and spaced from the first side plate 213 to form the first magnetic gap 25, that is, the side magnetic part 23 and the center magnetic part 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 the two 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 conducting yoke 21 are distributed in an up-down manner 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 the design of light and thin.

[0101] In the present embodiment, as shown in Figure 4 and Figure 5As shown, the support member 4 is arranged on one side of the first top plate 211 of the magnetic yoke 21 away from the center magnetic portion 22, and forms an air flow cavity 41 together with the first top plate 211. The first top plate 211 is provided with a first through hole 2111 which communicates the air flow cavity 41 and the second magnetic gap 26.

[0102] It can be understood that the number of the first through hole 2111 is one or more. In order to keep the air flow unobstructed and ensure the vibration balance of the second diaphragm 32, the number of the first through hole 2111 is at least two. In specific applications, different numbers of the first through hole 2111 can be set according to needs, and each first through hole 2111 is arranged at intervals. Alternatively, the first through hole 2111 includes a plurality of first through holes 2111 arranged at intervals. In the embodiment, the plurality of first through holes 2111 are arranged around the center magnetic portion 22 and are uniformly and interval arranged.

[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, S2 = (10% ~ 80%) S1.

[0104] In the embodiment, by controlling the opening area of the first through hole 2111 on the first top plate 211, the sound waves of the second diaphragm 32 can be beneficially radiated to the outside, and the structural strength of the magnetic yoke 21 and the connection area of the center magnetic portion 22 and the first top plate 211 can be ensured, thereby improving stability. Alternatively, 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 is not limited here.

[0105] It can be understood that the area of the first through hole 2111 is too small, which is not conducive to the radiation of the sound waves of the second diaphragm 32 to the outside; and the area of the first through hole 2111 is too large, which makes the bonding area of the center magnetic portion 22 and the first top plate 211 too small, which is not conducive to improving the connection reliability of 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 hole 2111 is a plurality, the opening area S2 of the first through hole 2111 is the sum of the opening areas of the plurality of first through holes 2111.

[0107] To further ensure the smoothness of the airflow below the second diaphragm 32, improve the high-frequency performance of the second diaphragm 32, and further improve the high-frequency performance of the first diaphragm 31 and the second diaphragm 32 after superposition. In an embodiment, the first top plate 211 includes a connected protruding portion 2112 and a supporting portion 2113, the protruding portion 2112 is protruded from the first top plate 211 towards the center magnetic portion 22, so that the supporting portion 2113 is arranged around the protruding portion 2112; wherein the supporting portion 2113 is provided with a first through hole 2111, the center magnetic portion 22 is arranged on the protruding portion 2112 and is spaced from the supporting portion 2113 to enclose the airflow passage 2114, the airflow passage 2114 communicates the second magnetic gap 26 and the first through hole 2111, and the support 4 is connected to one side of the supporting portion 2113 away from the airflow passage 2114.

[0108] In the present embodiment, as shown in Figures 3 to 8 , by arranging the protruding portion 2112 protruding towards the center magnetic portion 22 on the first top plate 211 of the magnetic yoke 21, the center magnetic portion 22 is arranged on the protruding portion 2112 and is spaced from the supporting portion 2113 to enclose the airflow passage 2114, and the first through hole 2111 is arranged on the supporting portion 2113, so that the airflow passage 2114 communicates the second magnetic gap 26 and the first through hole 2111, which can ensure the smoothness of the airflow 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 center magnetic portion 22, thereby ensuring the magnetic field strength.

[0109] It can be understood that the protruding portion 2112 is located in the center of the first top plate 211, thereby facilitating the installation and fixation of the center magnetic portion 22, and the supporting portion 2113 is arranged around the protruding portion 2112, so that a plurality of first through holes 2111 can be arranged to ensure the smoothness of the airflow below the second diaphragm 32.

[0110] In the present embodiment, as shown in Figures 3 to 8 , the connection between the protruding portion 2112 and the supporting portion 2113 forms an inclined surface 2116, and the first through hole 2111 penetrates the supporting portion 2113 and the inclined surface 2116 in sequence. It can be understood that the protruding portion 2112 is recessed from the side of the first top plate 211 of the magnetic yoke 21 facing the support 4 to the direction away from the support 4, so that the side of the first top plate 211 facing the center magnetic portion 22 is protruded to form the protruding portion 2112, that is, by stamping or stretching forming, which is not limited here.

[0111] It can be understood that by setting the first through hole 2111 to sequentially penetrate the support portion 2113 and the inclined surface 2116, the opening area of the first through hole 2111 is further increased, the airflow below the second diaphragm 32 is ensured to be smooth, the high-frequency performance of the second diaphragm 32 is improved, and the magnet volume of the center magnetic portion 22 is ensured, thereby ensuring the magnetic field strength. Alternatively, the first through hole 2111 includes a plurality of first through holes 2111, and the plurality of first through holes 2111 are arranged at intervals and surround the protruding portion 2112.

[0112] In the present embodiment, the outer shape profile of the first top plate 211 and the center magnetic portion 22 is optionally circular. In order to further increase the opening area of the first through hole 2111, the first through hole 2111 is optionally an arc-shaped hole extending along the periphery of the protruding portion 2112.

[0113] In an embodiment, as shown in Figure 4 、 Figure 5 、 Figure 7 and Figure 8 , the side of the support portion 2113 facing the support member 4 is recessed to form a support groove 2115 toward the airflow passage 2114, and the periphery of the support member 4 is limited in 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 to form a support groove 2115 toward the airflow passage 2114, so that the support member 4 can be positioned and installed using the support groove 2115, thereby improving the installation precision.

[0114] Alternatively, the first bottom plate 212 is provided with a recess corresponding to the first magnetic gap 25, and the recess is used to provide a recess for the first voice coil 33. It can be understood that the recess provides a recess space for the first voice coil 33, thereby providing the performance of the sound generating device 100.

[0115] In an embodiment, as shown in Figures 3 to 6 , the center magnetic portion 22 includes a center magnet 221 and a center magnetic plate 222 arranged in layers, and the center magnet 221 is connected to the magnetic yoke 21. It can be understood that the center magnet 221 is connected to the first top plate 211 of the magnetic yoke 21, that is, the center magnet 221 is clamped between the first top plate 211 and the center magnetic plate 222, and the outer periphery of the center magnet 221 and the center magnetic plate 222 is spaced from the first side plate 213 of the magnetic yoke 21 to form a second magnetic gap 26.

[0116] Alternatively, the center magnet 221 and the center magnetic plate 222 of the center magnetic portion 22 are optionally circular plates or disc-shaped structures, which are not limited here.

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

[0118] In order to further improve the connection stability, in the embodiment, the side magnetic conductive plate 232 is an integral molding structure with the shell 1. It can be understood that the shell 1 can be a metal material or a plastic material. When the shell 1 is a metal material, the shell 1 is integrally machined and formed with the side magnetic conductive plate 232, so that the machining steps can be simplified and the heat dissipation effect can be improved. When the shell 1 is a plastic material, the shell 1 and the side magnetic conductive plate 232 can be integrally injection molded, which is not limited here.

[0119] Alternatively, the side magnetic conductive plate 232 and the first shell 11 of the shell 1 are an integral molding structure, which is not limited here. In the embodiment, the side magnetic conductive plate 232 is injection molded on the shell 1, and the first leakage hole 111 is formed by removing material from the side magnetic conductive plate 232 and / or the corresponding region of the shell 1. It can be understood that by removing material from the side magnetic conductive plate 232 or the shell 1 or both the side magnetic conductive plate 232 and the shell 1 to form the first leakage hole 111, the first leakage hole 111 does not occupy the radial dimension of the sound generating device 100, or the size of the first leakage hole 111 can be increased under the limited size of the sound generating device 100 to balance the internal pressure.

[0120] In an embodiment, the support 4 comprises a second top plate 42, a second side plate 43 arranged at 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, the second bottom plate 44 being connected with the side of the magnetic conductive yoke 21 away from the center magnetic part 22, so that the second top plate 42, the second side plate 43 and the magnetic conductive yoke 21 form the 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 away from the airflow cavity 41, so that the third through hole 314 and the second through hole 421 are in communication.

[0121] In the embodiment, as shown in Figures 3 to 6 , Figure 9 and Figure 10As shown, the support member 4 can be an integral structure. The second side plate 43 is arranged 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 form a 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 towards the direction away from the cavity, that is, the second bottom plate 44 is arranged at an angle with the second side plate 43, so that the support member 4 is connected with the magnetic yoke 21 by the second bottom plate 44, thereby increasing the contact area and improving the connection stability, and the second top plate 42 of the support member 4 supports the first top plate 211 of the magnetic yoke 21 away from 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 form an airflow 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 piece, and the second bottom plate 44 is adhesively connected or welded to the magnetic yoke 21.

[0123] As can be understood, the second top plate 42 of the support member 4 is provided with a second through hole 421, so that the airflow cavity 41 communicates with the outside through the second through hole 421 and the third through hole 314 of the first diaphragm 31. In the 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 a ring-shaped 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 in 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 connected with the second top plate 42, and the inner side of the first diaphragm 31 is provided with multiple third through holes 314, and the multiple third through holes 314 at least partially correspond to and communicate 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 second through holes 421, 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, the multiple second through holes 421 and the multiple third through holes 314 can be arranged one by one, 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, S4=(10%~80%)S3.

[0127] In the embodiment, by controlling the opening area of the second through hole 421 on the second top plate 42, the sound waves of the second diaphragm 32 can be radiated to the outside, and the structural strength of the support 4 and the connection area between the inner edge of the first diaphragm 31 and the second top plate 42 can be ensured, thereby improving 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 is not limited here.

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

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

[0130] In an embodiment, as shown in Figures 3 to 6 The first diaphragm 31 includes an inner folding ring 311, a vibration part 312 and an outer folding ring 313 connected in sequence, the inner side of the inner folding ring 311 is provided with a third through hole 314 and connected with the support 4, the outer side of the outer folding ring 313 is connected with the shell 1, and the first voice coil 33 is connected with the vibration part 312. It can be understood that by setting the first diaphragm 31 as a double folding ring structure, the flexibility of the first diaphragm 31 is improved when the first voice coil 33 drives the first diaphragm 31 to vibrate, thereby improving the high frequency performance.

[0131] It can be understood that the inner side of the inner folding ring 311 of the first diaphragm 31 can be a ring structure or a flat plate structure. When the inner side of the inner folding ring 311 is a ring structure, the inner side of the inner folding ring 311 forms the third through hole 314; when the inner side of the inner folding ring 311 is a flat plate structure, the flat plate structure is provided with the third through hole 314, which is not limited here.

[0132] In the 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 recessing downward, which is not limited here. It can be understood that the inner folding ring 311 of the first diaphragm 31 protrudes away from the direction of the support 4, so that the first diaphragm 31 is not interfered when vibrating. Optionally, the inner folding ring 311 and the outer folding ring 313 of the first diaphragm 31 protrude away from the direction of 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 vibrating diaphragm 31 are integrally formed, so that the processing steps of the first vibrating diaphragm 31 can be simplified, and the structural strength of the first vibrating diaphragm 31 is improved.

[0134] In an embodiment, as shown in Figures 3 to 6 The first vibrating diaphragm 31 further comprises a vibrating plate 315, which is arranged between the vibrating part 312 and the first voice coil 33. It can be understood that the vibrating plate 315 is arranged to improve the structural strength of the first vibrating diaphragm 31, improve the acoustic performance of the first vibrating diaphragm 31, and avoid tearing the first vibrating diaphragm 31 when the first voice coil 33 vibrates.

[0135] In an embodiment, the second vibrating diaphragm 32 comprises a folding ring part 321 and a reinforcing part 322, the folding ring part 321 is arranged around the reinforcing part 322, the outer edge of the folding ring part 321 is connected with the shell 1, and the second voice coil 34 is connected with the reinforcing part 322.

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

[0137] It can be understood that the outer edge of the folding ring part 321 is connected with the shell 1, and the second voice coil 34 is connected with the reinforcing part 322, so that when the second voice coil 34 vibrates, the second vibrating diaphragm 32 is driven to vibrate, so that the sound wave of the second vibrating diaphragm 32 is radiated outward along the second magnetic gap 26, the airflow channel 2114, the first through hole 2111, the airflow cavity 41, the second through hole 421 and the third through hole 314.

[0138] In an embodiment, as shown in Figures 3 to 6 The sound generating device 100 further comprises a first positioning ring 51, which is arranged between the outer periphery of the first vibrating diaphragm 31 and the shell 1. Optionally, the first positioning ring 51 can be a steel ring, and the outer periphery of the outer folding ring 313 of the first vibrating diaphragm 31 and the shell 1 are connected by the first positioning ring 51, so that the first vibrating diaphragm 31 is convenient to take during assembly, and the assembly precision and the performance of the sound generating device 100 are improved.

[0139] In an embodiment, as shown in Figures 3 to 6As shown, the sound production device 100 further comprises a second positioning ring 52, which is arranged between the outer periphery of the second diaphragm 32 and the shell 1. Optionally, the second positioning ring 52 can be a steel ring, and the outer periphery of the folded ring portion 321 of the second diaphragm 32 is arranged between the shell 1 by using the second positioning ring 52, so that the second diaphragm 32 is convenient to take during assembly, and at the same time, the assembly precision is improved, and the performance of the sound production device 100 is improved.

[0140] In an embodiment, the sound production device 100 further comprises a front cover 7, which is located on the side of the first diaphragm 31 away from the second diaphragm 32, and 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 and the outside, and 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 the embodiment, as shown in Figure 1 、 Figures 3 to 6 , by arranging 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 arranging the fourth through hole 72 on the front cover 7, the sound waves on the first side of the first diaphragm 31 and the second diaphragm 32 are conveniently radiated to the outside through the fourth through hole 72.

[0142] Optionally, the front cover 7 is a metal piece processed from a metal material, which is convenient to support the sound production device 100 during assembly of the sound production device 100 and also reduces the occupation of the overall size. In specific applications, a proper number of fourth through holes 72 is arranged according to actual conditions, and is not limited to a fixed number. Preferably, a damping piece or a breathable film is arranged on the fourth through hole 72, which can further adjust the airflow velocity of the second cavity 71 and adjust the acoustic resistance of the second cavity 71.

[0143] In an embodiment, the magnetic circuit system 2 further comprises a first magnet 24 arranged in the airflow cavity 41, and the first magnet 24 is used to assist in increasing the number of magnetic induction lines passing through the magnetic yoke 21.

[0144] In the embodiment, as shown in Figure 5 and Figure 6 , by arranging the first magnet 24 in the airflow cavity 41, the first magnet 24 cooperates with the center magnetic portion 22 to effectively strengthen the magnetic field strength of the magnetic circuit system 2, thereby improving the BL value, and at the same time, the installation stability of the first magnet 24 can be improved by using the first top plate 211 of the magnetic yoke 21 and / or the second top plate 42 of the support 4. It should be noted that the magnets of the first magnet 24 and the center magnetic portion 22 are magnetized along the vibration direction of the vibration system 3 and the magnetization directions are opposite.

[0145] Optionally, the projection 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, so that the mounting stability can be improved without affecting the radiation of the sound waves of the second diaphragm 32 by the first through hole 2111 of the magnetic yoke 21.

[0146] In the embodiment, the opposite sides of the first magnet 24 are connected with the magnetic yoke 21 and the support 4 respectively, so that the connection stability of the first magnet 24 and the support 4 can be further improved, and the reliability can be improved.

[0147] Optionally, the first through hole 2111 comprises 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, the second through hole 421 comprises 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] The sound generating device 100 of the utility model sets the magnetic yoke 21 of the magnetic circuit system 2 as a reverse bending structure, which can increase the bonding area of the central magnetic portion 22, reduce the reliability risk, and increase the area of the first through hole 211 of the magnetic yoke 21, and improve the high-frequency performance.

[0149] As shown in the figure, the utility model also provides an electronic equipment 900, which comprises the sound generating device 100. Figure 11 The specific structure of the sound generating device 100 is referred to the foregoing embodiments, and since the electronic equipment adopts all the technical solutions of the foregoing embodiments, at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be repeated here.

[0150] In an embodiment, the electronic equipment 900 further comprises a device shell 800, the device shell 800 is provided with a receiving cavity 810, the sound generating device 100 is arranged in the receiving cavity 810 and divides the receiving cavity 810 into a front cavity 840 and a rear cavity 850 which are isolated from each other, and the first side of the first diaphragm 31 and the second diaphragm 32 is communicated with the front cavity 840; wherein the device shell 800 is provided with a sound outlet hole 820 which is communicated with the front cavity 840, and the sound waves of 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 the embodiment, the device shell 800 can be a metal shell or a plastic shell, which is not limited here. The device shell 800 can be an integral structure or a split structure, which is not limited here. Optionally, the device shell 800 comprises an upper shell and a lower shell, and the upper shell and the lower shell can be adhesively connected or welded to form the receiving cavity 810.

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

[0153] It can be understood that the upper shell of the device housing 800 is provided with a sound hole 820 in communication with the front cavity 840, so that the sound waves of 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 hole 820.

[0154] In the embodiment, the first cavity 13 of the sound generating device 100 is in communication with the rear cavity 850 through the first leakage hole 111, and the second side of the second diaphragm 32 is in communication with the rear cavity 850. In an embodiment, the device housing 800 is also provided with a second leakage hole 830, which is in communication with the rear cavity 850, and the sound waves radiated to the rear cavity 850 by the first diaphragm 31 and the second diaphragm 32 are opposite in phase to the sound waves of the front cavity 840, and the sound waves of the rear cavity 850 are radiated to the outside through the second leakage hole 830.

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

[0156] In the embodiment, the second leakage hole 830 can be a circular hole, an elliptical hole or a polygonal hole, etc., which is not limited herein. The number of the second leakage hole 830 can be one or more, which is not limited herein according to actual application design.

[0157] In the 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, and 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 oppositely arranged top wall and bottom wall and side wall connecting the top wall and the bottom wall. Optionally, the sound hole is arranged on the top wall or the connecting area of 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 of the side wall and the bottom wall. In this way, the sound generating performance of the electronic device 900 and the technical effect of protecting privacy can be considered, and the most suitable design scheme can be selected according to actual needs during use, and the present application is not limited herein.

[0158] The above only describes optional embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation or direct / indirect application in other related technical fields under the concept of the present application and using the content of the present application specification and drawings is included in the patent protection scope of the present application.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: shell; A magnetic circuit system is connected to the outer shell. The magnetic circuit system includes a central magnetic part, a side magnetic part, and a magnetically conductive yoke connecting the central magnetic part and the side magnetic part. A first magnetic gap is formed between the side magnetic part and the magnetically conductive yoke, and a second magnetic gap is formed between the central magnetic part and the magnetically conductive yoke. The first magnetic gap is arranged around the second magnetic gap. A support member is disposed on the side of the magnetic yoke opposite to the central magnetic part, and together with the magnetic yoke, forms an airflow cavity. The magnetic yoke has a first through hole connecting the second magnetic gap and the airflow cavity, and the support member has a second through hole connecting the airflow cavity. A 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 outer shell, and the inner periphery of the first diaphragm is connected to the support member. 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 outer shell 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. The sound waves from the first side of the second diaphragm radiate outward through the first through hole, the airflow cavity, the second through hole, and the third through hole, and together with the sound waves from the first side of the first diaphragm, radiate outward on the same side of the sound-generating device.

2. The sound-generating device as described in claim 1, characterized in that, The magnetic yoke includes a first top plate, a first bottom plate, and a first side plate connecting the first top plate and the first bottom plate. The first bottom plate is connected to the outer shell. The central magnetic part is disposed on the first top plate and is spaced apart from the first side plate to form a second magnetic gap. The edge magnetic part is disposed on the first bottom plate and is spaced apart from the first side plate to form the first magnetic gap. The first top plate is provided with the first through hole, and the support member is provided on the side of the first top plate facing away from the central magnetic part, and together with the first top plate, they form the airflow cavity.

3. The sound-generating device as described in claim 2, characterized in that, The first top plate includes a protrusion and a support portion connected to each other. The protrusion is formed by the first top plate protruding toward the central magnetic portion, such that the support portion is arranged around the protrusion. The support portion is provided with the first through hole, the central magnetic portion is provided on the protrusion and is spaced apart from the support portion to 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 portion opposite to the airflow channel.

4. The sound-generating device as described in claim 3, characterized in that, The side of the support portion facing the support member is recessed towards the airflow channel to form a support groove, and the periphery of the support member is confined within the support groove; And / or, the connection between the protrusion and the support forms an inclined surface, and the first through hole sequentially passes through the support and the inclined surface; And / or, the first through hole includes a plurality of them, the plurality of first through holes are spaced apart and surround the protrusion; And / or, the first through hole is an arc-shaped hole extending along the periphery of the protrusion; And / or, the first base plate is provided with a clearance groove corresponding to the first magnetic gap, and the clearance groove is used to provide clearance for the first voice coil; 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; And / or, define the area of ​​the first top plate as S1, and define the opening area of ​​the first through hole as S2, where S2 = (10% ~ 80%)S1.

5. The sound-generating device as described in claim 1, characterized in that, The support includes a second top plate, a second side plate disposed around the periphery of the second top plate, and a second bottom plate extending outward from the end of the second side plate away from the second top plate. The second bottom plate is connected to the side of the magnetic yoke facing away from the central magnetic part, so that the second top plate, the second side plate and the magnetic yoke enclose and form the airflow cavity. The second top plate is provided with the second through hole, 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 communicates with the second through hole.

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

7. The sound-generating device as claimed in claim 1, characterized in that, The first diaphragm includes an inner folded ring, a vibrating part, and an outer folded ring connected in sequence. The inner folded ring has the third through hole on its inner side and is connected to the support member. The outer side of the outer folded ring is connected to the outer shell. The first voice coil is connected to the vibrating part.

8. The sound-generating device as claimed in claim 7, characterized in that, The first diaphragm further includes a vibrating plate, which is disposed between the vibrating part and the first voice coil; And / or, the second diaphragm includes a surround portion and a reinforcing portion, the surround portion is disposed around the reinforcing portion, the outer edge of the surround portion is connected to the housing, and the second voice coil is connected to the reinforcing portion; And / or, the outer casing includes a first housing and a second housing connected together, the end of the first housing away from the second housing is connected to the outside of the first diaphragm, the side of the second housing opposite to the first housing is connected to the outer periphery of the second diaphragm, and the outer periphery of the magnetic yoke is connected to the side of the second housing opposite to the second diaphragm.

9. The sound-generating device as claimed in claim 1, characterized in that, 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 external environment, and the second side of the first diaphragm and the second diaphragm radiates a second sound wave to the external environment. The first sound wave and the second sound wave are out of phase. Alternatively, the sound-generating device is applied to an electronic device and is 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 are connected to the front cavity, and the second side 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 a second sound wave to the rear cavity. The first sound wave and the second sound wave are out of phase. 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 ventilator, the first ventilator being connected to the inner edge of the first diaphragm and covering 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-generating device is provided with a first leakage hole connecting the first cavity and the outside, and the sound-generating device further includes a second ventilator covering the first leakage hole.

10. The sound-generating device as claimed in claim 1, characterized in that, The central magnetic part includes a central magnet and a central magnetic plate stacked together, and the central magnet is connected to the magnetic yoke; And / or, the edge magnetic part includes an edge magnet and an edge magnetic plate stacked together, the edge magnet is connected to the magnetic yoke, and the edge magnetic plate and the outer shell are integrally formed; And / or, the sound-generating device further includes a first positioning ring, which is disposed between the outer periphery of the first diaphragm and the outer shell; And / or, the sound-generating device further includes a second positioning ring, which is disposed between the outer periphery of the second diaphragm and the outer shell; And / or, the sound-generating device further includes a front cover, which is located on the side of the first diaphragm away from the second diaphragm, and a second cavity is formed between the first diaphragm and the front cover. The front cover is provided with a fourth through hole that connects the second cavity to the outside, 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, the first magnet being used to help increase the number of magnetic field lines passing through the magnetic yoke.

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

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

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

15. The electronic device as claimed in claim 14, characterized in that, The device housing includes a top wall and a bottom wall disposed opposite each other, and a side wall connecting the top wall and the bottom wall, wherein, The sound outlet is located in the connection area between the top wall or the side wall and the top wall, and the second leakage hole is located in the connection area between the side wall or the bottom wall or the side wall and the bottom wall.

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