Sound production device and electronic device

Abstract

The application discloses a sound generating device and electronic equipment, and relates to the technical field of electroacoustic conversion. The first diaphragm and the second diaphragm of the sound generating device are spaced apart along a first direction and are respectively connected with two ends of a voice coil along the first direction. A vibrating plate is located on the inner side of the voice coil. A side magnetic part includes a side magnetic conducting plate located between the first diaphragm and the second diaphragm and on the outer side of the voice coil. Two center magnets of a center magnetic part are located on opposite sides of the vibrating plate, and the two center magnets are magnetized along the first direction and have opposite magnetization directions. The sound generating device forms a first cavity and a second cavity on the two sides of the vibrating plate, a third cavity between the first diaphragm and the second diaphragm, and a first sound outlet and a second sound outlet respectively communicating with the first cavity and the second cavity. The two center magnets are exposed in the first cavity and the second cavity respectively, and the side magnetic conducting plate is exposed in the third cavity. The sound generating device effectively increases the BL value, improves the acoustic performance, and can also reduce the problem of sound leakage in the far field.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer technology, and in particular to a sound-generating device and an electronic device using the sound-generating device. Background Art

[0002] In recent years, with the rapid development of consumer electronic products, micro speakers, as a common electroacoustic transducer device, have been widely used in mobile phones, glasses, headphones, tablet computers and other fields, and these portable terminal products have gradually formed an application trend of multi-function, miniaturization and high performance.

[0003] In related technologies, the speakers used in smart glasses are generally placed in the temples near the ears, but the narrow internal space of the temples limits the performance of the speakers, resulting in low speaker loudness. In addition, the open sound field design of the speakers in the temples causes large sound leakage, which reduces the consumer experience. Summary of the Invention

[0004] The main purpose of the present invention is to provide a sound-emitting device and an electronic device, aiming to provide a double-sided sound-emitting device, which not only improves the BL value and the acoustic performance of the entire device, but also can effectively reduce the far-field sound leakage problem.

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

[0006] a vibration system comprising a diaphragm assembly and a voice coil, the diaphragm assembly comprising a first diaphragm, a second diaphragm, and a vibration plate, the first diaphragm and the second diaphragm both vibrating in a first direction, the first diaphragm and the second diaphragm being spaced apart along the first direction and respectively connected to both ends of the voice coil along the first direction, the vibration plate being located inside the voice coil, and the outer periphery of the vibration plate being disposed in contact with the inner circumferential wall of the voice coil; and

[0007] A magnetic circuit system comprising a central magnetic portion and a side magnetic portion, wherein the side magnetic portion comprises a side magnetic plate located outside the voice coil, the side magnetic plate being disposed between the first diaphragm and the second diaphragm, the central magnetic portion comprising two central magnets disposed oppositely and spaced apart along the first direction, the two central magnets being located on either side of the diaphragm along the first direction, the two central magnets being magnetized along the first direction in opposite directions, and the side magnetic portion and the central magnetic portion cooperating to form a magnetic gap for accommodating the voice coil;

[0008] In which, the sound-emitting device is formed with a first cavity and a second cavity located on both sides of the vibration plate along the first direction, and a third cavity located between the first diaphragm and the second diaphragm. The two center magnets are exposed to the first cavity and the second cavity respectively on the side facing the vibration plate, and the side of the side magnetic conductive plate facing the first diaphragm and the second diaphragm are exposed to the third cavity. The sound-emitting device is also provided with a first sound outlet hole and a second sound outlet hole respectively connecting the first cavity and the second cavity.

[0009] In one embodiment, the thickness of the side magnetic conductive plate along the first direction is less than the extension length of the voice coil along the first direction, and is not less than 1 / 10 of the extension length of the voice coil along the first direction; or the thickness of the side magnetic conductive plate along the first direction is less than the thickness of the center magnet along the first direction, and is not less than 1 / 10 of the thickness of the center magnet along the first direction;

[0010] And / or, a projection of the edge magnetic conductive plate along a direction perpendicular to the first direction is located within an extension length range of the voice coil along the first direction.

[0011] In one embodiment, projections of the two central magnets along the first direction are located inside the voice coil;

[0012] And / or, the distances between the two sides of the vibration plate along the first direction and the corresponding central magnet are the same;

[0013] And / or, the vibration plate corresponds to the middle position of the voice coil along the first direction;

[0014] And / or, the magnetic energy products of the two central magnets are the same;

[0015] And / or, the two central magnets are symmetrically arranged relative to the vibration plate;

[0016] And / or, the first diaphragm and the second diaphragm are symmetrically arranged relative to the vibration plate;

[0017] And / or, the thickness of the vibration plate along the first direction is smaller than the extension length of the voice coil along the first direction;

[0018] And / or, the voice coil is an integrally wound structure and extends along the first direction; or, the voice coil includes a first sub-voice coil and a second sub-voice coil provided on opposite sides of the vibration plate, and the first diaphragm and the second diaphragm are respectively connected to ends of the first sub-voice coil and the second sub-voice coil that are opposite to each other along the first direction;

[0019] And / or, a peripheral edge of the vibration plate is bent and extended toward the inner surface of the voice coil to form an extension portion, and the extension portion is connected to the inner surface of the voice coil.

[0020] In one embodiment, the vibration system further includes a first frame and a second frame, wherein two ends of the first frame along the first direction are respectively connected to the first diaphragm and one end of the voice coil, and two ends of the second frame along the first direction are respectively connected to the second diaphragm and the other end of the voice coil;

[0021] The first diaphragm and the second diaphragm each include an inner connecting portion, a folded ring portion arranged around the inner connecting portion, and an outer connecting portion arranged around the folded ring portion. The inner connecting portion is connected to an end of the first skeleton or the second skeleton away from the voice coil.

[0022] In one embodiment, both of the two folding ring portions protrude toward the edge magnetic portion;

[0023] And / or, the sound-generating device further comprises a housing, and the two external connecting portions are respectively connected to two ends of the housing along the first direction, so that the housing, the first diaphragm, the first skeleton, the voice coil, the second skeleton, and the second diaphragm enclose the third cavity; wherein the edge magnetic plate and the housing are an integrally formed structure;

[0024] And / or, the first diaphragm and the vibration plate radiate a first sound wave into the first cavity, and the second diaphragm and the vibration plate radiate a second sound wave into the second cavity, and the first sound wave and the second sound wave have opposite phases;

[0025] And / or, one end of the first frame and / or the second frame adjacent to the inner connecting portion is bent and extended toward the inner connecting portion to form a first bent portion, and the first bent portion is connected to the inner connecting portion;

[0026] And / or, the first skeleton and / or the second skeleton are bent and extended at one end adjacent to the voice coil to form a second bent portion, and the second bent portion is connected to the end of the voice coil; or, the first skeleton and / or the second skeleton are extended along the inner surface of the voice coil at one end adjacent to the voice coil and are connected to the inner surface of the voice coil.

[0027] In one embodiment, the magnetic circuit system further includes a first magnetic yoke and a second magnetic yoke disposed opposite to each other, and the two central magnets include a first central magnet and a second central magnet, wherein a side of the first central magnet facing away from the vibration plate is connected to the first magnetic yoke, and a side of the second central magnet facing away from the vibration plate is connected to the second magnetic yoke;

[0028] The first cavity is formed between the first diaphragm, the voice coil, the vibration plate and the first magnetic yoke, and the second cavity is formed between the second diaphragm, the voice coil, the vibration plate and the second magnetic yoke. The first magnetic yoke and the second magnetic yoke are respectively provided with the first sound outlet and the second sound outlet.

[0029] In one embodiment, the sound-generating device further includes a housing, the housing being located between the first magnetic yoke and the second magnetic yoke, the outer peripheries of the first diaphragm and the second diaphragm being connected to the housing respectively, and the edge magnetic conductive plate being located between the first diaphragm and the second diaphragm and connected to the housing;

[0030] The housing, the first diaphragm, the voice coil and the second diaphragm cooperate to form the third cavity, and the sound-generating device is provided with an air vent connected to the third cavity.

[0031] In one embodiment, the housing is provided with a mounting hole, the edge magnet is provided in the mounting hole, and is enclosed with the mounting hole to form the air leakage hole;

[0032] And / or, the side magnetic conductive plate and the housing are an integrally formed structure;

[0033] And / or, the housing is made of metal or plastic;

[0034] And / or, the outer shell includes a first shell and a second shell arranged along the first direction, the two ends of the first shell are respectively connected to the side magnetic conductive plate and the first magnetic yoke, and the two ends of the second shell are respectively connected to the side magnetic conductive plate and the second magnetic yoke; wherein the air vent is provided between the first shell or the second shell or the first shell and the second shell.

[0035] In one embodiment, the first magnetic yoke includes a first top plate portion and a first side plate portion arranged at an angle, the first central magnet is provided on the first top plate portion, and the outer periphery of the first diaphragm is sandwiched between the first side plate portion and the housing, and is opposite to and spaced from the first top plate portion;

[0036] The second magnetic yoke includes a second top plate portion and a second side plate portion arranged at an angle, the second central magnet is provided on the second top plate portion, and the outer periphery of the second diaphragm is sandwiched between the second side plate portion and the housing and is opposite to and spaced from the second top plate portion;

[0037] Wherein, the first top plate portion and / or the first side plate portion is provided with the first sound outlet hole, and the second top plate portion and / or the second side plate portion is provided with the second sound outlet hole.

[0038] In one embodiment, the vibration system further includes a centering support provided in the third cavity, the centering support including an outer fixing portion, an inner fixing portion, and an elastic arm portion connecting the outer fixing portion and the inner fixing portion, the outer fixing portion being connected to the housing, and the inner fixing portion being connected to the voice coil;

[0039] In which, the voice coil includes two long sides and two short sides connected end to end, the side magnetic part includes two side magnetic conductive plates, and the two side magnetic conductive plates are symmetrically arranged on opposite sides of the voice coil and extend respectively along the extension direction of the long sides. The elastic arm part and the internal fixed part each include four, and the two ends of each elastic arm part are respectively connected to the external fixed part and one internal fixed part, and two elastic arm parts and two internal fixed parts are arranged corresponding to one short side, and the other two elastic arm parts and the other two internal fixed parts are arranged corresponding to the other short side.

[0040] The present invention also provides an electronic device, comprising the above-mentioned sound-generating device;

[0041] The electronic device is provided with an installation cavity and a first sound outlet and a second sound outlet connected to the installation cavity. The sound-emitting device is provided in the installation cavity. The first sound outlet of the sound-emitting device is connected to the first sound outlet, and the second sound outlet of the sound-emitting device is connected to the second sound outlet.

[0042] In one embodiment, the electronic device is a pair of smart glasses, the smart glasses include temples, and the temples are provided with the mounting cavity, the first sound outlet, and the second sound outlet;

[0043] The first sound outlet and the second sound outlet are located on two opposite surfaces of the glasses leg along the first direction, and one of the surfaces faces the ear of the user.

[0044] The sound-generating device of the technical solution of the present invention is configured by setting the diaphragm assembly of the vibration system to a first diaphragm, a second diaphragm and a vibration plate, using the first diaphragm and the second diaphragm to be spaced apart along a first direction and respectively connected to the two ends of the voice coil along the first direction, and the vibration plate is arranged on the inner side of the voice coil so that the outer periphery of the vibration plate is arranged against the inner peripheral wall of the voice coil, thereby forming a first cavity and a second cavity located on both sides of the vibration plate along the first direction in the sound-generating device, and providing a first sound outlet and a second sound outlet respectively communicating with the first cavity and the second cavity in the sound-generating device. In this way, the dual diaphragms are connected and driven by a voice coil, so that the first diaphragm and the second diaphragm both vibrate along the first direction, which ensures the loudness consistency of the dual diaphragm structure, and the phases of the sound waves in the two cavities are completely opposite, so that both sides of the sound-emitting device can directly emit sound. Placing the sound-emitting device in the temple of the whole machine can form a "true" dipole up and down, reducing far-field leakage and ensuring privacy; at the same time, by setting the side magnetic part of the magnetic circuit system as a side magnetic plate located on the outside of the voice coil, and the side magnetic plate is set between the first diaphragm and the second diaphragm, The two central magnets of the central magnetic part are arranged opposite to each other and spaced apart along the first direction, and are located on both sides of the vibration plate along the first direction, so that the two central magnets are magnetized along the first direction and in opposite directions, and the two central magnets are exposed to the first cavity and the second cavity respectively on the side facing the vibration plate. In this way, the magnetic field strength in the area where the voice coil is located is enhanced by utilizing the opposing magnetic structure formed by the two central magnets, thereby enhancing the magnetic force acting on the voice coil. Moreover, the voice coil is located in the magnetic gap formed by the side magnetic plate of the side magnetic part and the central magnetic part. Under the action of the opposing magnetic structure formed by the two central magnets and the side magnetic plate, the magnetic force acting on the voice coil is enhanced, and the magnetic lines of force are highly concentrated near the voice coil, thereby enhancing the magnetic field driving force acting on the voice coil, effectively increasing the BL value, thereby improving the performance and the acoustic performance of the sound-generating device. Furthermore, by exposing the two sides of the side magnetic plate facing the first diaphragm and the second diaphragm in the third cavity formed between the first diaphragm and the second diaphragm of the sound-generating device, the side magnetic part is thinned, and the two central magnets eliminate the structure of the conventional center washer, effectively reducing the thickness of the sound-generating device in the Z direction. Moreover, under the same volume requirement, since there is no center washer structure, the volume of the two center magnets can be made larger, thereby improving the BL value of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0046] Figure 1A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention;

[0047] Figure 2 A schematic top view of an embodiment of a sound-generating device provided by the present invention;

[0048] Figure 3 An exploded schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0049] Figure 4 A schematic cross-sectional view of a first embodiment of a sound-generating device provided by the present invention;

[0050] Figure 5 A partial cross-sectional schematic diagram of a first embodiment of the sound-generating device provided by the present invention;

[0051] Figure 6 A cross-sectional schematic diagram of a second embodiment of the sound-generating device provided by the present invention;

[0052] Figure 7 A schematic cross-sectional view of a third embodiment of the sound-generating device provided by the present invention;

[0053] Figure 8 A schematic cross-sectional view of a fourth embodiment of the sound-generating device provided by the present invention;

[0054] Figure 9 A cross-sectional schematic diagram of a vibration system in an embodiment of a sound-generating device provided by the present invention;

[0055] Figure 10 A cross-sectional schematic diagram of a vibration system in another embodiment of the sound-generating device provided by the present invention;

[0056] Figure 11 A cross-sectional schematic diagram of the connection between the voice coil, the bracket and the vibration plate in one embodiment of the sound-generating device provided by the present invention;

[0057] Figure 12 A cross-sectional schematic diagram of the connection between the voice coil and the vibration plate in one embodiment of the sound-generating device provided by the present invention;

[0058] Figure 13 A cross-sectional schematic diagram of the connection between the voice coil and the vibration plate in another embodiment of the sound-generating device provided by the present invention;

[0059] Figure 14 A schematic structural diagram of an embodiment of the first diaphragm and the second diaphragm provided by the present invention;

[0060] Figure 15 A schematic cross-sectional view of a vibration plate and a magnetic conductive layer in an embodiment of a sound-generating device provided by the present invention;

[0061] Figure 16A schematic cross-sectional view of a vibration plate and a magnetic conductive layer in another embodiment of the sound-generating device provided by the present invention;

[0062] Figure 17 A schematic cross-sectional view of a vibration plate and a magnetic conductive member in an embodiment of a sound-generating device provided by the present invention;

[0063] Figure 18 A schematic cross-sectional view of a vibration plate and a magnetic conductive member in another embodiment of the sound-generating device provided by the present invention;

[0064] Figure 19 This is a BL curve diagram of the sound-generating device provided by the present invention and the prior art.

[0065] Description of Figure Numbers:

[0066] 100. Sound-generating device; 1. Housing; 11. First shell; 12. Second shell; 13. Third cavity; 14. Air vent; 15. Mounting hole; 2. Vibration system; 21. Diaphragm assembly; 211. First diaphragm; 2111. Inner connecting portion; 2112. Folding ring portion; 2113. Outer connecting portion; 2114. First end; 2115. Second end; 2116. Deformation portion; 212. Second diaphragm; 213. Vibrating plate; 2131. Extension portion; 2132. Magnetic conductive layer; 2133. Magnetic conductive member; 22. Voice coil; 221. Long side; 222. Short side; 223. First sub-voice coil; 224. Second sub-voice coil; 231. First skeleton; 232. Second skeleton; 233. First bending portion; 234. Second bending portion 3. Magnetic circuit system; 31. First magnetic yoke; 311. First top plate; 312. First side plate; 313. First sound outlet; 314. First cavity; 32. Second magnetic yoke; 321. Second top plate; 322. Second side plate; 323. Second sound outlet; 324. Second cavity; 33. Center magnetic part; 331. Center magnet; 3311. First center magnet; 3312. Second center magnet; 34. Side magnetic part; 341. Side magnet; 342. Side magnetic guide plate; 343. First side magnet; 344. Second side magnet; 345. Third side magnet; 35. Magnetic gap.

[0067] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0068] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0069] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0070] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or an option in which both A and B are satisfied.

[0071] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0072] In recent years, with the rapid development of consumer electronics, electronic devices such as smartphones, smart glasses, and VR / AR products have gradually gained consumer acceptance and are widely used in daily life. Micro speakers, as a common electroacoustic transducer device, are widely used in mobile phones, glasses, headphones, tablets, and other fields. These portable terminal products are gradually forming an application trend of multifunctionality, miniaturization, and high performance. As the performance of electronic products improves, the acoustic performance of speakers is also inevitably improved.

[0073] In related technologies, the speakers used in smart glasses are generally placed in the temples near the ears, but the narrow internal space of the temples limits the performance of the speakers, resulting in lower loudness of the speakers; at the same time, the position of the sound holes on the temples is usually a certain distance away from the ear canal, which causes a certain degree of attenuation of the loudness transmitted into the ear canal; at the same time, because this propagation mode is approximately an open sound field, the speakers are also radiating sound outward, resulting in a certain amount of leakage in the far field, a large sound leakage phenomenon, poor privacy, and reduced consumer experience.

[0074] Based on the above concepts and problems, the present invention proposes a sound-emitting device 100. It is understandable that the sound-emitting device 100 is applied to electronic devices, which may be mobile phones, headphones, smart wearable devices, smart glasses, etc., without limitation herein. The sound-emitting device 100 of the present invention is a double-sided speaker structure with advantages such as high performance and low sound leakage. When applied to glasses, it can perfectly meet the current market demand for eyewear products. In addition, the materials and assembly processes of the various components in the sound-emitting device 100 are simple, highly mature, and highly manufacturable.

[0075] Please refer to Figures 1 to 18 As shown, in an embodiment of the present invention, the sound-generating device 100 includes a vibration system 2 and a magnetic circuit system 3. The vibration system 2 includes a diaphragm assembly 21 and a voice coil 22. The diaphragm assembly 21 includes a first diaphragm 211, a second diaphragm 212 and a vibration plate 213. The first diaphragm 211 and the second diaphragm 212 both vibrate along a first direction, and the first diaphragm 211 and the second diaphragm 212 are spaced apart along the first direction and are respectively connected to the two ends of the voice coil 22 along the first direction. The vibration plate 213 is located on the inner side of the voice coil 22, and the outer periphery of the vibration plate 213 is arranged to abut against the inner circumferential wall of the voice coil 22. The magnetic circuit system 3 includes a central magnetic portion 33 and a side magnetic portion 34. The side magnetic portion 34 is arranged between the first diaphragm 211 and the second diaphragm 212 and is located on the outer side of the voice coil 22. The central magnetic portion 33 includes two central magnets 331 that are opposite to each other and spaced apart along a first direction. The two central magnets 331 are located on both sides of the vibration plate 213 along the first direction, and the two central magnets 331 are magnetized along the first direction and in opposite directions. The side magnetic portion 34 cooperates with the central magnetic portion 33 to form a magnetic gap 35 for accommodating the voice coil 22. The sound-emitting device 100 is formed with a first cavity 314 and a second cavity 324 located on both sides of the vibration plate 213 along the first direction. The two central magnets 331 are exposed in the first cavity 314 and the second cavity 324 respectively on the side facing the vibration plate 213. The sound-emitting device 100 is also provided with a first sound outlet 313 and a second sound outlet 323 that are connected to the first cavity 314 and the second cavity 324 respectively.

[0076] In this embodiment, the sound-generating device 100 is a micro-speaker. The sound-generating device 100 also includes a housing 1, and the magnetic circuit system 3 and the vibration system 2 of the sound-generating device 100 can be installed and fixed through the housing 1, that is, the magnetic circuit system 3 and the vibration system 2 are fixed to the housing 1, so that the sound-generating device 100 is used as an independent component in an electronic device or a sound-generating module, which is not limited here. Of course, in other embodiments, the outer periphery of the diaphragm assembly 21 in the vibration system 2 can be directly fixed to the magnetic circuit system 3; or, the magnetic circuit system 3 and the vibration system 2 of the sound-generating device 100 can be installed as a separate structure in the housing of the electronic device or the sound-generating module, which is not limited here.

[0077] Optionally, the outer contour of the sound-generating device 100 can be circular or square, so that the outer contours of the housing 1, the magnetic circuit system 3, and the vibration system 2 are correspondingly set to be circular or square, and the specific design is based on actual needs and is not limited here. In this embodiment, the housing 1 can be optionally a frame or frame structure, that is, the housing 1 has a cavity with two ends open, the magnetic circuit system 3 is connected to the housing 1, and the vibration system 2 is connected to the housing 1 and is opposite to and spaced from the magnetic circuit system 3. The housing 1 can be a steel sheet structure or a plastic structure, which is not limited here.

[0078] Optionally, the housing 1 can be a single unit or comprised of multiple separate units, which is not a limitation herein. It is understood that the housing 1 is provided with conductive terminals, and the voice coil 22 is electrically connected to the conductive terminals, thereby facilitating the connection of the voice coil 22 to an external circuit via the conductive terminals.

[0079] In this embodiment, if Figures 3 to 10 As shown, by setting the diaphragm assembly 21 of the vibration system 2 to be a first diaphragm 211, a second diaphragm 212 and a vibration plate 213, the first diaphragm 211 and the second diaphragm 212 are spaced apart along the first direction and are respectively connected to the two ends of the voice coil 22 along the first direction, and the vibration plate 213 is located on the inner side of the voice coil 22, and the outer periphery of the vibration plate 213 is arranged against the inner peripheral wall of the voice coil 22, so that a first cavity 314 and a second cavity 324 are formed on both sides of the vibration plate 213 along the first direction in the sound-emitting device 100, and a first sound outlet 313 and a second sound outlet 323 are provided in the sound-emitting device 100, which are connected to the first cavity 314 and the second cavity 324 respectively. The dual-diaphragm structure is connected to the vibration plate 213 through a voice coil 22 to drive the vibration. This ensures that the loudness of the sound waves in the two cavities is consistent and the phases are completely opposite. That is, the first diaphragm 211 and the second diaphragm 212 radiate equal and opposite-phase sound waves to the first cavity 314 and the second cavity 324 respectively. In this way, the first cavity 314 and the second cavity 324 radiate equal and opposite-phase sound waves outward through the first sound outlet 313 and the second sound outlet 323 respectively. According to the superposition effect of dipoles, the two opposite-phase sound waves in the far field can be offset to the greatest extent, greatly improving the sound leakage problem of the sound-emitting device 100 during use, protecting the user's privacy, and improving the user experience. Placing the sound-emitting device 100 in the glasses leg of the whole machine can form a "true" dipole up and down, reducing far-field leakage and ensuring privacy.

[0080] It should be noted that the first diaphragm 211 and the second diaphragm 212 are directly connected to both ends of the voice coil 22 along the first direction, for example, the inner side of the first diaphragm 211 is directly connected to one end of the voice coil 22, and the inner side of the second diaphragm 212 is directly connected to the other end of the voice coil 22. Of course, the first diaphragm 211 and the second diaphragm 212 can be indirectly connected to both ends of the voice coil 22 along the first direction, for example, the inner side of the first diaphragm 211 is connected to one end of the voice coil 22 via a bracket or a frame, and the inner side of the second diaphragm 212 is connected to the other end of the voice coil 22 via a bracket or a frame, which is not limited here.

[0081] Understandably, Figure 1 、 Figures 3 to 8 As shown, by arranging the side magnetic portion 34 of the magnetic circuit system 3 between the first diaphragm 211 and the second diaphragm 212 and located on the outside of the voice coil 22, and the two center magnets 331 of the center magnetic portion 33 are arranged oppositely and spaced along the first direction, and are located on opposite sides of the vibration plate 213 along the first direction, so that the two center magnets 331 are magnetized along the first direction and the magnetization directions are opposite, and the two center magnets 331 are exposed to the first cavity 314 and the second cavity 324 respectively on the side facing the vibration plate 213. In this way, the two center magnets 331 cooperate with the side magnetic portion 34 to form a magnetic field region that is longer in the vertical direction and has a relatively uniform magnetic field distribution in the area corresponding to the voice coil 22, so that the magnetic lines of force passing through the voice coil 22 are more numerous and denser, and the driving force is greater, which can provide the voice coil 22 with a large and flat driving force that changes slowly with displacement, thereby realizing a superlinear BL(x) design and reducing the risk of distortion. At the same time, the magnetic structure formed by the two center magnets 331 further enhances the magnetic field strength in the area where the voice coil 22 is located, effectively increases the BL value, and improves the acoustic performance of the sound-generating device 100; further, the two center magnets 331 cancel the structure of the conventional center washer, which not only achieves a thinning design, but also makes the magnetic lines of force more evenly distributed and the BL (x) curve flatter, thereby reducing distortion. Moreover, under the same volume requirement, since there is no center washer structure, the volume of the two center magnets 331 can be made larger, thereby improving the BL value of the product. Wherein, B represents the magnetic flux density generated by the magnet, L is the effective length of the voice coil 22, and x is the vibration displacement of the voice coil 22. As Figure 19 As shown, the abscissa of the BL(x) curve is the displacement x of the voice coil 22 , in mm, and the ordinate of the BL(x) curve is the BL value, in N / A.

[0082] In this embodiment, if Figures 3 to 8As shown, the two central magnets 331 of the central magnetic portion 33 include a first central magnet 3311 and a second central magnet 3312. The first central magnet 3311 is located near the top of the voice coil 22, and the second central magnet 3312 is located near the bottom of the voice coil 22. It will be understood that the top of the voice coil 22 is the end where the voice coil 22 is connected to the first diaphragm 211, and the bottom of the voice coil 22 is the end where the voice coil 22 is connected to the second diaphragm 212. Optionally, the first central magnet 3311 is located within the first cavity 314, and the second central magnet 3312 is located within the second cavity 324.

[0083] Optionally, the projections of the two central magnets 331 along the first direction are located inside the voice coil 22. This prevents the voice coil 22 from rubbing against the first central magnet 3311 or the second central magnet 3312 when the voice coil 22 vibrates. The radially outer height space of the central magnetic portion 33 is utilized to accommodate the vibration displacement of the voice coil 22. This eliminates the need for additional height space between the first central magnet 3311 and the second central magnet 3312 to accommodate the vibration displacement of the voice coil 22, thereby facilitating a thinner design for the sound-generating device 100.

[0084] At the same time, by setting the central magnetic part 33 of the magnetic circuit system 3 as the first central magnet 3311 and the second central magnet 3312, and making the first central magnet 3311 and the second central magnet 3312 facing the vibration plate 213 side exposed to the first cavity 314 and the second cavity 324 of the sound-emitting device 100 respectively, the two central magnets 331 (that is, the first central magnet 3311 and the second central magnet 3312) are both magnetized along the first direction and the magnetization directions are opposite. Compared with the magnetic circuit structure of a conventional speaker, the central magnetic part 33 of the present invention eliminates the central washer (or central magnetic conductive plate) structure, thereby reducing the thickness of the sound-emitting device 100 in the Z direction. Moreover, the first central magnet 3311 and the second central magnet 3312 are magnetized along a first direction and in opposite directions, forming a counter-magnetic structure. The magnetic lines of force generated by the first central magnet 3311 and the second central magnet 3312 are repelled and transmitted to the outside of the voice coil 22, and cooperate with the side magnet portion 34 located on the outside of the voice coil 22 to form a magnetic field region that is longer in the vertical direction and has a relatively uniform magnetic field distribution. This makes the magnetic lines of force passing through the voice coil 22 more numerous and denser, and the driving force is greater. It can provide the voice coil 22 with a large and flat driving force that changes slowly with displacement, thereby realizing a super-linear BL(x) design and reducing the risk of distortion. Figure 19 As shown; and, under the premise that the thickness of the sound-generating device 100 is certain, compared with the conventional solution, the central magnetic portion 33 of the present invention cancels the central washer (or central magnetic plate) structure, so that the first central magnet 3311 and the second central magnet 3312 can cooperate to effectively increase the volume of the central magnetic portion 33 and improve the BL value, as shown in FIG. Figure 19 shown.

[0085] Optionally, the voice coil 22 is an annular voice coil and extends along a first direction, that is, the voice coil 22 has a height along the first direction and a thickness along a second direction, the second direction is perpendicular to the first direction, and the height of the voice coil 22 is greater than the thickness of the voice coil 22.

[0086] It should be noted that the thickness of the voice coil 22 is the distance between the inner and outer walls of the annular voice coil. In this embodiment, the voice coil 22 has a greater height than thickness. During vibration, especially at relatively large amplitudes, it is less affected by magnetic field variations, resulting in a significantly flatter BL(x) curve. This significantly reduces distortion in the sound-generating device 100 and improves sound quality. The voice coil 22 in this embodiment is suitable for use in full-band speakers operating in the 20 Hz to 20 kHz frequency range.

[0087] Specifically, optionally, the ratio of the height dimension to the thickness dimension of the voice coil 22 ranges from 1.1:1 to 10:1, and the specific ratio can be 1.1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, etc., and the user can choose according to actual needs.

[0088] In this embodiment, if Figures 4 to 8 As shown, by arranging the side magnetic portion 34 between the first diaphragm 211 and the second diaphragm 212 and on the outside of the voice coil 22, the side magnetic portion 34 cooperates with the two center magnets 331 of the center magnetic portion 33 to form a magnetic gap 35 for accommodating the voice coil 22, thereby effectively ensuring the magnetic field strength within the magnetic gap 35.

[0089] It can be understood that the side magnetic portions 34 form magnetic circuits with the two central magnets 331 of the central magnetic portion 33, and the magnetic lines of force of the two magnetic circuits repel each other, so that the magnetic lines of force in the magnetic gap 35 are more evenly distributed and more magnetic lines of force pass through the voice coil 22, thereby increasing the magnetic force acting on the voice coil 22, effectively improving the BL value, and making the BL(x) curve flatter, thereby reducing distortion.

[0090] It should be noted that the side magnet portion 34 can be a unitary structure. For example, the side magnet portion 34 can be an integrally formed annular structure, that is, the side magnet portion 34 is arranged in an annular shape and surrounds the outside of the voice coil 22. Of course, the side magnet portion 34 can also be a split structure, in which case it includes multiple side magnet portions 34, which are connected end to end to form a closed annular structure and surround the outside of the voice coil 22; or, the side magnet portions 34 can be spaced apart and arranged around the voice coil 22, that is, there are gaps or gaps between adjacent side magnet portions 34, which are not limited here.

[0091] In one embodiment, the sound-generating device 100 includes a vibration system 2 and a magnetic circuit system 3. The vibration system 2 includes a diaphragm assembly 21 and a voice coil 22. The diaphragm assembly 21 includes a first diaphragm 211, a second diaphragm 212 and a vibration plate 213. The first diaphragm 211 and the second diaphragm 212 both vibrate along a first direction, and the first diaphragm 211 and the second diaphragm 212 are spaced apart along the first direction and are respectively connected to the two ends of the voice coil 22 along the first direction. The vibration plate 213 is located on the inner side of the voice coil 22, and the outer periphery of the vibration plate 213 is abutted against the inner circumferential wall of the voice coil 22. The magnetic circuit system 3 includes a central magnetic portion 33 and a side magnetic portion 34. The side magnetic portion 34 includes a side magnetic conductive plate 342 located outside the voice coil 22, and the side magnetic conductive plate 342 is provided between the first diaphragm 211 and the second diaphragm 212. The central magnetic portion 33 includes two central magnets 33 that are opposite and spaced apart along the first direction. 31. The two center magnets 331 are located on both sides of the vibration plate 213 along the first direction, and the two center magnets 331 are magnetized along the first direction and in opposite directions. The side magnetic portion 34 cooperates with the center magnetic portion 33 to form a magnetic gap 35 for accommodating the voice coil 22. The sound-emitting device 100 is formed with a first cavity 314 and a second cavity 324 located on both sides of the vibration plate 213 along the first direction, and a third cavity 13 located between the first diaphragm 211 and the second diaphragm 212. The two center magnets 331 are exposed to the first cavity 314 and the second cavity 324 respectively on one side facing the vibration plate 213, and the side magnetic conductive plate 342 is exposed to the third cavity 13 on both sides facing the first diaphragm 211 and the second diaphragm 212. The sound-emitting device 100 is also provided with a first sound outlet 313 and a second sound outlet 323 respectively connecting the first cavity 314 and the second cavity 324.

[0092] Understandably, Figure 1 、 Figures 3 to 5As shown, the sound-generating device 100 is configured by setting the diaphragm assembly 21 of the vibration system 2 to be a first diaphragm 211, a second diaphragm 212 and a vibration plate 213, and utilizing the first diaphragm 211 and the second diaphragm 212 to be spaced apart along the first direction and respectively connected to the two ends of the voice coil 22 along the first direction, and the vibration plate 213 is arranged on the inner side of the voice coil 22 so that the outer periphery of the vibration plate 213 is arranged against the inner peripheral wall of the voice coil 22, thereby forming a first cavity 314 and a second cavity 324 located on both sides of the vibration plate 213 along the first direction in the sound-generating device 100, and the first cavity 314 and the second cavity 324 are respectively connected in the sound-generating device 100. 4, the first sound outlet hole 313 and the second sound outlet hole 323 are connected to the first diaphragm 211 and the second diaphragm 213 through a voice coil 22, so that the double diaphragms are connected to drive the vibration plate 213 to vibrate, thereby achieving the loudness consistency of the sound waves in the two cavities, and the phases are completely opposite, so that both sides of the sound-emitting device 100 can directly emit sound, and the sound-emitting device 100 can be placed in the glasses leg of the whole machine to form a "true" dipole up and down, thereby reducing far-field leakage and ensuring privacy; at the same time, by setting the side magnetic part 34 of the magnetic circuit system 3 as the side magnetic plate 342 located on the outside of the voice coil 22, and the side magnetic plate 342 is set between the first diaphragm 211 and the second diaphragm 212, and the two center magnetic parts 33 of the center magnetic part 33 are connected to the first diaphragm 211 and the second diaphragm 212, respectively. The irons 331 are arranged oppositely and spaced apart along the first direction and are located on opposite sides of the vibration plate 213 along the first direction, so that the two central magnets 331 are magnetized along the first direction and in opposite directions, and the two central magnets 331 are exposed to the first cavity 314 and the second cavity 324 on the side facing the vibration plate 213, respectively. In this way, the magnetic field strength in the area where the voice coil 22 is located is enhanced by utilizing the counter-magnetic structure formed by the two central magnets 331, thereby enhancing the magnetic force exerted on the voice coil 22, and the voice coil 22 is in the magnetic gap 35 formed by the side magnetic conductive plate 342 of the side magnetic portion 34 and the central magnetic portion 33. Under the action of the magnetic conductive plate 342, the magnetic force acting on the voice coil 22 is enhanced, and the magnetic lines of force are highly concentrated near the voice coil 22, which increases the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, thereby improving performance and the acoustic performance of the sound-generating device 100. Furthermore, by exposing the side magnetic conductive plates 342 on both sides facing the first and second diaphragms 211, 212 to the third cavity 13 formed between the first and second diaphragms 211, 212 of the sound-generating device 100, the side magnetic portion 34 is designed to be thinner, and the two center magnets 331 are designed without the conventional center washer structure, effectively reducing the thickness of the sound-generating device 100 in the Z direction. Moreover, under the same volume requirements, the lack of a center washer structure allows the two center magnets 331 to be larger, thereby improving the product's BL value.

[0093] Optionally, the side magnetic conductive plate 342 is an integrally formed annular structure. This can effectively increase the volume of the side magnetic conductive plate 342, thereby improving the magnetic field concentration effect and enhancing the magnetic field driving force acting on the voice coil 22. Of course, the side magnetic conductive plate 342 can also be set as a split structure, in which case the side magnetic conductive plate 342 includes multiple. Optionally, multiple side magnetic conductive plates 342 are connected end to end to form a closed annular structure. This can effectively increase the volume of the side magnetic conductive plate 342, thereby improving the magnetic field concentration effect and enhancing the magnetic field driving force acting on the voice coil 22. Alternatively, multiple side magnetic conductive plates 342 are spaced apart and arranged around the voice coil 22. In this way, gaps or notches are formed between adjacent side magnetic conductive plates 342, which facilitates the setting of structures such as centering supports, which are not limited here.

[0094] In one embodiment, the thickness of the edge magnetic plate 342 along the first direction is less than the extension length of the voice coil 22 along the first direction, and is no less than 1 / 10 of the extension length of the voice coil 22 along the first direction. As will be appreciated, this configuration effectively reduces the thickness of the edge magnetic portion 34, thereby reducing the overall vertical height of the sound-generating device 100, i.e., the Z-axis height.

[0095] Optionally, the thickness of the side magnetic conductive plates 342 along the first direction is less than the thickness of the center magnet 331 along the first direction, but not less than 1 / 10 of the thickness of the center magnet 331 along the first direction. As will be appreciated, this arrangement ensures that the side magnetic conductive plates 342 concentrate the magnetic flux lines formed by the two center magnets 331 while also reducing the thickness of the side magnetic portion 34, thereby reducing the overall vertical height of the sound-generating device 100, i.e., its Z-axis height.

[0096] It should be noted that if Figure 4 and Figure 5 As shown, by configuring the side magnet portion 34 as a side magnetic conductive plate 342, that is, there is only one side magnetic conductive plate 342 along the first direction, the side magnetic conductive plates 342 form a magnetic circuit with the two center magnets 331, and the magnetic flux lines are concentrated and guided through the voice coil 22 located in the magnetic gap 35, thereby increasing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thus improving the performance and the acoustic performance of the sound-generating device 100. At the same time, the side magnet portion 34 is designed to be thinner, thereby reducing the thickness of the sound-generating device 100 in the Z direction.

[0097] In one embodiment, a projection of the side magnetic conductive plate 342 along a direction perpendicular to the first direction is located within an extension length of the voice coil 22 along the first direction.

[0098] In this embodiment, if Figure 4 and Figure 5As shown, when the sound-generating device 100 is in the assembled state, that is, when the voice coil 22 is not vibrating, the projection of the side magnetic conductive plate 342 along the first direction is located between the top of the voice coil 22 and the bottom of the voice coil 22. In this way, more magnetic lines of force are guided to pass through the voice coil 22, so that the magnetic lines of force of the magnetic field in which the voice coil 22 is located are more uniform, thereby ensuring that the magnetic force on the voice coil 22 remains unchanged or changes very little when it vibrates, and making the magnetic lines of force of the magnetic circuit system 3 more evenly distributed and the BL(x) curve flatter, thereby reducing distortion.

[0099] In one embodiment, the distances between the two sides of the vibration plate 213 along the first direction and the corresponding central magnet 331 are the same.

[0100] In this embodiment, if Figures 4 to 8 As shown, along the first direction, the vibration plate 213 has a first surface facing the first central magnet 3311 and a second surface facing the second central magnet 3312. Optionally, the distance from the first surface to the first central magnet 3311 is the same as the distance from the second surface to the second central magnet 3312. This ensures that when the voice coil 22 drives the vibration plate 213 to vibrate along the first direction, collision and interference between the vibration plate 213 and the first and second central magnets 3311, 3312 are effectively avoided. Optionally, the projection of the vibration plate 213 perpendicular to the first direction is located in the middle of the voice coil 22, that is, the projection of the vibration plate 213 along the second direction is located in the middle of the voice coil 22. This makes the magnetic lines of force of the magnetic field surrounding the voice coil 22 more uniform, and the magnetic circuit system 3 can provide the voice coil 22 with a large, flat driving force that varies slowly with displacement, thereby achieving a superlinear BL(x) design and reducing the risk of distortion. Optionally, the vibration plate 213 corresponds to the middle position of the voice coil 22 along the first direction.

[0101] Optionally, the thickness of the vibration plate 213 along the first direction is less than the extension length of the voice coil 22 along the first direction. This ensures that the vibration plate 213 and the voice coil 22 cooperate to provide space for the two central magnets 331 during the vibration of the voice coil 22, while also ensuring the structural strength of the vibration plate 213 and the sealing performance of the first cavity 314 and the second cavity 324.

[0102] To further ensure that the voice coil 22 vibrates within the magnetic gap 35, driving the first diaphragm 211 and the second diaphragm 212 to radiate sound waves of equal magnitude and opposite phases to the first cavity 314 and the second cavity 324, respectively, the two center magnets 331 can optionally have the same magnetic energy product. This ensures that the magnetic field strength of the first center magnet 3311 is the same as the magnetic field strength of the second center magnet 3312, thereby ensuring that the magnetic field driving force acting on the voice coil 22 is the same.

[0103] To ensure that the sound waves emitted by the first cavity 314 and the second cavity 324 have the same loudness and the magnetic field of the magnetic gap 35 is uniform, the two center magnets 331 are optionally arranged symmetrically relative to the vibration plate 213. This arrangement ensures that the driving force on both ends of the voice coil 22 is the same.

[0104] In this embodiment, the two center magnets 331 have identical outer profiles, and the thickness ratio of the two center magnets 331 along the first direction can be selected from 0.5 to 2. Alternatively, the thickness ratio of the two center magnets 331 along the first direction can be selected from 0.5, 1, 1.5, 2, and so on, without limitation. This arrangement ensures that the two center magnets 331 of the center magnetic portion 33 form a magnetic circuit with the side magnetic portions 34, thereby ensuring a high density of magnetic flux lines within the magnetic gap 35 that passes through the voice coil 22.

[0105] In order to further ensure that the loudness of the sound waves emitted by the first cavity 314 and the second cavity 324 are consistent, optionally, the first diaphragm 211 and the second diaphragm 212 are symmetrically arranged relative to the vibration plate 213 .

[0106] It can be understood that in order to ensure that the central magnetic portion 33 and the side magnetic portion 34 cooperate to generate a driving force on the voice coil 22, optionally, the thickness of the side magnetic portion 34 along the first direction is greater than the extension length of the voice coil 22 along the first direction; on the other hand, in order to thin the thickness of the sound-emitting device 100 and further reduce the space occupied by the entire machine, the thickness of the side magnetic portion 34 along the first direction is not greater than 3 times the extension length of the voice coil 22 along the first direction.

[0107] In one embodiment, the projection of the voice coil 22 along the first direction is located on the surface of the side magnet portion 34 facing the voice coil 22. Optionally, the projection of the voice coil 22 along the first direction is located between the two center magnets 331.

[0108] In this embodiment, when the sound-generating device 100 is not operating, that is, when the voice coil 22 is not vibrating, the projection of the voice coil 22 along the first direction (i.e., the second direction) is located on the surface of the side magnet portion 34 facing the voice coil 22, and the projection of the voice coil 22 along the first direction (i.e., the second direction) is located between the two center magnets 331. This ensures that the voice coil 22 can reciprocate and approach the first center magnet 3311 or the second center magnet 3312 during vibration, thereby ensuring that the magnetic force acting on the voice coil 22 remains unchanged or changes very little during movement, and making the magnetic lines of force of the magnetic circuit system 3 more evenly distributed and the BL(x) curve flatter, thereby reducing distortion.

[0109] It should be noted that when the voice coil 22 vibrates at a small amplitude, the projection of the voice coil 22 along the first direction perpendicular to the voice coil 22 is located on the surface of the side magnet portion 34 facing the voice coil 22, and the projection of the voice coil 22 along the first direction is located between the two center magnets 331. However, when the voice coil 22 vibrates at a large amplitude, the projection of the voice coil 22 along the first direction perpendicular to the voice coil 22 is located on the surface of the side magnet portion 34 facing the voice coil 22, and the projection of the voice coil 22 along the first direction is located between the two center magnets 331, only when the voice coil 22 is not vibrating. This is not a limitation here.

[0110] In one embodiment, if Figures 3 to 12 As shown, the voice coil 22 can also be set as an integrally formed structure, that is, the voice coil 22 is an integrally wound structure and extends along the first direction, so that the voice coil 22 is accommodated in the magnetic gap 35, thereby simplifying the structural design of the sound-generating device 100 and improving assembly efficiency.

[0111] Of course, in other embodiments, the voice coil 22 may also be configured as a split structure, such as Figure 13 As shown, the voice coil 22 includes a first sub-voice coil 223 and a second sub-voice coil 224 arranged on opposite sides of the vibration plate 213, and the first diaphragm 211 and the second diaphragm 212 are respectively connected to one end of the first sub-voice coil 223 and the second sub-voice coil 224 that are opposite to each other along a first direction, which is not limited here.

[0112] In order to further improve the connection stability of the vibration plate 213, in one embodiment, as shown in FIG. Figure 12 As shown, the periphery of the vibration plate 213 is bent and extended toward the inner surface of the voice coil 22 to form an extension portion 2131, which is connected to the inner surface of the voice coil 22. As can be understood, by bending and extending the periphery of the vibration plate 213 to form the extension portion 2131, the extension portion 2131 increases the connection area with the voice coil 22, thereby improving the connection strength and stability.

[0113] To further enhance the driving force on the voice coil 22 and improve the performance of the sound-generating device 100, in one embodiment, the vibration plate 213 has magnetic conductivity. This configuration allows the vibration plate 213 to be attracted to the two central magnets 331 of the central magnetic portion 33 when the voice coil 22 vibrates, thereby increasing the driving force on the voice coil 22 and improving the performance of the sound-generating device 100.

[0114] It is understood that the vibration plate 213 has magnetic conductivity, which can be achieved by the vibration plate 213 itself being made of a magnetic material or a material containing a magnetic material. Of course, a magnetic layer 2132 and a magnetic member 2133 can also be provided on the vibration plate 213, which is not limited here.

[0115] In one embodiment, if Figure 15 and Figure 16As shown, at least one surface of the vibration plate 213 is coated with a magnetic conductive layer 2132. It is understood that the surface of the vibration plate 213 facing the first central magnet 3311 and / or the second central magnet 3312 is coated with the magnetic conductive layer 2132. Optionally, the magnetic conductive layer 2132 is a magnetic conductive coating applied to the vibration plate 213.

[0116] Optionally, the sum of the thickness of the vibration plate 213 along the first direction and the thickness of the magnetic conductive layer 2132 along the first direction is less than the extension length of the voice coil 22 along the first direction. It will be appreciated that to avoid excessive thickness of the magnetic conductive layer 2132, which would cause the vibration plate 213 to be excessively heavy and affect the vibration quality of the vibration system 2, the thickness of the magnetic conductive layer 2132 along the first direction is preferably no greater than five times the thickness of the vibration plate 213 along the first direction.

[0117] In one embodiment, if Figure 17 and Figure 18 As shown, the vibration plate 213 is provided with a magnetic conductive member 2133. It is understood that the magnetic conductive member 2133 can be a metal magnetic conductive member, embedded in the interior of the vibration plate 213; or embedded on the surface of the vibration plate 213; or, the vibration plate 213 is provided with a through hole, and the magnetic conductive member 2133 is embedded in the through hole, which is not limited here.

[0118] Optionally, the vibration plate 213 and the magnetic conductive member 2133 are an integrally formed structure; or, the vibration plate 213 and the magnetic conductive member 2133 are bonded or welded together, etc., which is not limited here.

[0119] To ensure the connection between the first and second diaphragms 211, 212 and the voice coil 22, a space is formed between the first and second diaphragms 211, 212 for mounting the edge magnet 34 to ensure that the vibrations of the first and second diaphragms 211, 212 do not interfere with the edge magnet 34. In one embodiment, the vibration system 2 further includes a skeleton structure, which is connected to the voice coil 22 and extends along a first direction to support and connect the first and second diaphragms 211, 212 and keep them away from the voice coil 22. It is understood that the skeleton structure can be an integral structure or a split structure, which is not limited here.

[0120] In one embodiment, the vibration system 2 further includes a bracket 24, which is disposed on the inner side of the voice coil 22, extends along the first direction and protrudes from both ends of the voice coil 22 along the first direction, the first diaphragm 211 and the second diaphragm 212 are respectively connected to the two ends of the bracket 24 along the first direction, and the outer periphery of the vibration plate 213 is connected to the bracket 24.

[0121] In this embodiment, if Figure 11As shown, by providing the skeleton structure as an integrally formed bracket 24, and positioning the bracket 24 inside the voice coil 22, extending in the first direction and protruding beyond both ends of the voice coil 22 along the first direction, the first diaphragm 211 and the second diaphragm 212 can be conveniently connected to the respective ends of the bracket 24 along the first direction, thus simplifying assembly steps. It will be appreciated that the outer periphery of the vibration plate 213 is connected to the bracket 24. This not only allows the vibration plate 213 and the bracket 24 to fit within the space on opposite sides of the vibration plate 213 for accommodating the two center magnets 331, but also improves sealing.

[0122] It can be understood that the bracket 24 and the vibration plate 213 are provided separately. Optionally, the bracket 24 and the vibration plate 213 are bonded or welded, which is not limited here.

[0123] In order to further improve the connection stability between the bracket 24 and the first diaphragm 211 and the second diaphragm 212 , in one embodiment, both ends of the bracket 24 along the first direction are bent and extended to form edge portions 241 , and the edge portions 241 are connected to the first diaphragm 211 or the second diaphragm 212 .

[0124] Understandably, Figure 11 As shown, at least one end of the bracket 24 is bent and extended toward the first diaphragm 211 or the second diaphragm 212 to form an edge portion 241, so that the side support of the first diaphragm 211 or the second diaphragm 212 is connected to the edge portion 241, thereby increasing the connection area and improving the connection stability.

[0125] In one embodiment, the vibration system 2 further includes a first skeleton 231 and a second skeleton 232, wherein the two ends of the first skeleton 231 along the first direction are respectively connected to the first diaphragm 211 and one end of the voice coil 22, and the two ends of the second skeleton 232 along the first direction are respectively connected to the second diaphragm 212 and the other end of the voice coil 22.

[0126] In this embodiment, if Figures 3 to 10 As shown, by setting the skeleton structure as a split structure, the skeleton structure includes a first skeleton 231 and a second skeleton 232, and the first skeleton 231 and the second skeleton 232 are respectively arranged at the two ends of the voice coil 22 along the first direction, that is, the two ends of the first skeleton 231 along the first direction are respectively connected to the first diaphragm 211 and one end of the voice coil 22, and the two ends of the second skeleton 232 along the first direction are respectively connected to the second diaphragm 212 and the other end of the voice coil 22, so that the first skeleton 231 and the second skeleton 232 do not occupy the space of the magnetic gap 35, which is beneficial to reducing the width of the magnetic gap 35, and the first skeleton 231 and the second skeleton 232 are used to support the first diaphragm 211 and the second diaphragm 212 away from each other, so that the first diaphragm 211 and the second diaphragm 212 are spaced apart along the first direction, and a space for installing the edge magnetic part 34 is formed.

[0127] In order to increase the connection stability between the first skeleton 231 / the second skeleton 232 and the first diaphragm 211 / the second diaphragm 212, in one embodiment, as shown in FIG. Figures 3 to 10 As shown, the first skeleton 231 and / or the second skeleton 232 bends and extends toward the first diaphragm 211 / second diaphragm 212 at one end away from the voice coil 22 to form a first bending portion 233, and the first diaphragm 211 / second diaphragm 212 is connected to the first bending portion 233, thereby increasing the connection area and improving the connection stability.

[0128] In order to increase the connection stability between the first frame 231 / the second frame 232 and the voice coil 22, in one embodiment, as shown in FIG. Figures 3 to 10 As shown, one end of the first frame 231 and / or the second frame 232 adjacent to the voice coil 22 is bent and extended to form a second bent portion 234, which is connected to the end of the voice coil 22. This increases the connection area and improves the connection stability.

[0129] Of course, in other embodiments, the first frame 231 and / or the second frame 232, adjacent to the voice coil 22, extends along the inner surface of the voice coil 22 and is connected to the inner surface of the voice coil 22. It is understood that the first frame 231 and / or the second frame 232 may extend along the inner surface of the voice coil 22 until they are connected to or abut the vibration plate 213, and this is not limited here.

[0130] In one embodiment, the first diaphragm 211 and the second diaphragm 212 both include an inner connecting portion 2111, a folded ring portion 2112 arranged around the inner connecting portion 2111, and an outer connecting portion 2113 arranged around the folded ring portion 2112, and the inner connecting portion 2111 is connected to the end of the first skeleton 231 or the second skeleton 232 away from the voice coil 22.

[0131] In this embodiment, if Figures 3 to 9 As shown, the inner connecting portion 2111, the folding portion 2112 and the outer connecting portion 2113 of the first diaphragm 211 and the second diaphragm 212 are connected and arranged in a direction perpendicular to the first direction. The first diaphragm 211 and the second diaphragm 212 are connected to the first frame 231 / the second frame 232 or the bracket 24 through the inner connecting portion 2111.

[0132] Optionally, one end of the first skeleton 231 and / or the second skeleton 232 adjacent to the inner connecting portion 2111 is bent and extended toward the inner connecting portion 2111 to form a first bending portion 233 , and the first bending portion 233 is connected to the inner connecting portion 2111 .

[0133] As will be appreciated, the first diaphragm 211 and the second diaphragm 212 are connected to a housing or shell structure via external connecting portions 2113. In one embodiment, the sound-generating device 100 further includes a housing 1, with two external connecting portions 2113 connected to the housing 1 at opposite ends along a first direction, such that the housing 1, the first diaphragm 211, the first bobbin 231, the voice coil, the second bobbin 232, and the second diaphragm 212 enclose a third cavity 13. Optionally, the side magnetic plate 342 is integrally formed with the housing 1.

[0134] It should be noted that the folding ring portions 2112 of the first diaphragm 211 and the second diaphragm 212 can be convex structures that bulge upward or concave structures that sink downward. Optionally, both folding ring portions 2112 bulge toward the edge magnetic portion 34, which is not limited here.

[0135] Of course, the first diaphragm 211 and the second diaphragm 212 can also be configured as vertical diaphragms. Figure 10 As shown, the first diaphragm 211 and the second diaphragm 212 each include a first end 2114, a second end 2115 and a deformation portion 2116 connecting the first end 2114 and the second end 2115. The first end 2114 and the second end 2115 are arranged at both ends of the deformation portion 2116 along the first direction. The first end 2114 is connected to the first skeleton 231 / the second skeleton 232 or the bracket 24, and the second end 2115 is connected to the edge magnetic portion 34.

[0136] It is understood that the deformation portion 2116 can be deformed and stretched along the first direction, and the deformation portion 2116 has at least one bend along the first direction. Optionally, the deformation portion 2116 has multiple bends along the first direction, and the multiple bends are arranged and connected along the first direction, which is not limited here.

[0137] In one embodiment, the first diaphragm 211 and the vibration plate 213 radiate a first sound wave toward the first cavity 314 , and the second diaphragm 212 and the vibration plate 213 radiate a second sound wave toward the second cavity 324 . The first sound wave and the second sound wave have opposite phases.

[0138] In this embodiment, the first cavity 314 and the second cavity 324 are located on both sides of the vibration plate 213 along the first direction. Figure 4 、 Figures 6 to 8 As shown, the magnetic circuit system 3 also includes a first magnetic yoke 31 and a second magnetic yoke 32 arranged opposite to each other, so that a first cavity 314 is formed between the first diaphragm 211, the first skeleton 231 or the bracket 24, the vibration plate 213 and the first magnetic yoke 31 of the magnetic circuit system 3, and a second cavity 324 is formed between the second diaphragm 212, the second skeleton 232 or the bracket 24, the vibration plate 213 and the second magnetic yoke 32 of the magnetic circuit system 3, and a third cavity 13 is formed between the first diaphragm 211, the first skeleton 231 or the bracket 24, the voice coil 22 and the outer shell 1.

[0139] It can be understood that the sound-emitting device 100 is provided with a first sound hole 313 connected to the first cavity 314 , and the sound-emitting device 100 is provided with a second sound hole 323 connected to the second cavity 324 , so that the sound-emitting device 100 emits sound outward through the first sound hole 313 and the second sound hole 323 .

[0140] In order to balance the air pressure of the first cavity 314 , the second cavity 324 and the third cavity 13 , the sound-generating device 100 is further provided with an air vent 14 communicating with the third cavity 13 , so that the third cavity 13 of the sound-generating device 100 can be easily vented through the air vent 14 .

[0141] It can be understood that the voice coil 22 drives the first diaphragm 211 and the vibration plate 213 to radiate the first sound wave to the first cavity 314, and the voice coil 22 drives the second diaphragm 212 and the vibration plate 213 to radiate the second sound wave to the second cavity 324, so that the phases of the first sound wave and the second sound wave are opposite. In this way, the first sound wave of the first cavity 314 of the sound-emitting device 100 is radiated outward through the first sound outlet 313, and the second sound wave of the second cavity 324 is radiated outward through the second sound outlet 323. From a fixed position at a longer distance in the environment, since the positions of the two sound waves are relatively close, it can be considered that the distances of the fixed positions relative to the two sound waves are approximately the same, so that the two sound waves will produce two equal and opposite sound fields. Therefore, the fixed position will receive two equal and opposite phase sound waves. According to the superposition effect of dipoles, the sound waves at the fixed position can be offset to the greatest extent, which greatly improves the sound leakage problem of the sound-emitting device 100 during use, protects the user's privacy, and improves the user experience.

[0142] In another embodiment, the edge magnet portion 34 includes two edge magnets 341 stacked along a first direction and a edge magnetic conductive plate 342 arranged between the two edge magnets 341; wherein, the two edge magnets 341 are magnetized along the first direction and the magnetization directions are opposite, and the magnetic poles at one end of the two edge magnets 341 away from each other are opposite in polarity to the magnetic poles at one end of the two center magnets 331 away from each other.

[0143] In this embodiment, if Figure 6 As shown, by setting the side magnetic portion 34 to two side magnets 341 stacked along the first direction and a side magnetic conductive plate 342 provided between the two side magnets 341, the two side magnets 341 respectively form a magnetic circuit with the two center magnets 331, and the side magnetic conductive plate 342 between the two side magnets 341 is used to gather and guide the magnetic flux lines of the two magnetic circuits through the voice coil 22 located in the magnetic gap 35, thereby increasing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and further improving the performance, thereby improving the acoustic performance of the sound-generating device 100.

[0144] Optionally, the two side magnets 341 and the side magnetic conductive plates 342 of the side magnetic portion 34 have similar structural profiles. That is, when the side magnetic portion 34 is a one-piece ring structure, the two side magnets 341 and the side magnetic conductive plates 342 are both one-piece ring structures. Alternatively, when the side magnetic portion 34 is a split structure, the two side magnets 341 and the side magnetic conductive plates 342 are both split structures and correspond one to one. Of course, in other embodiments, the structures of the two side magnets 341 and the side magnetic conductive plates 342 of the side magnetic portion 34 can also be different, for example, one of the two side magnets 341 and the side magnetic conductive plates 342 is a one-piece ring structure, and the other is a split structure. This is not limited here.

[0145] In one embodiment, a projection of the side magnetic conductive plate 342 along a direction perpendicular to the first direction is located within an extension length of the voice coil 22 along the first direction.

[0146] In this embodiment, when the sound-emitting device 100 is in an assembled state, that is, when the voice coil 22 is not vibrating, the side magnetic conductive plate 342 is located between the top of the voice coil 22 and the bottom of the voice coil 22 along the projection perpendicular to the first direction. In this way, more magnetic lines of force are guided through the voice coil 22, making the magnetic lines of force of the magnetic field in which the voice coil 22 is located more uniform, thereby ensuring that the magnetic force acting on the voice coil 22 remains unchanged or changes very little when it vibrates, and making the magnetic lines of force of the magnetic circuit system 3 more evenly distributed and the BL(x) curve flatter, thereby reducing distortion.

[0147] Optionally, the thickness of the edge magnetic plate 342 along the first direction is less than the extension length of the voice coil 22 along the first direction, but not less than 1 / 5 of the extension length of the voice coil 22 along the first direction. This configuration ensures that the magnetic flux lines gathered by the edge magnetic plate 342 pass through the voice coil 22 within the magnetic gap 35, thereby increasing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thus improving performance and the acoustic performance of the sound-generating device 100.

[0148] In one embodiment, a projection of the side magnetic conductive plate 342 along a direction perpendicular to the first direction is located between the surface of the first central magnet 3311 and the surface of the second central magnet 3312 facing the diaphragm assembly 21 .

[0149] In this embodiment, if Figure 6 As shown, by arranging the side magnetic conductive plate 342 of the side magnetic portion 34 between the surfaces of the first center magnet 3311 and the second center magnet 3312 facing the diaphragm assembly 21 along the projection perpendicular to the first direction, it can be ensured that the side magnetic portion 34 can form a magnetic circuit with the first center magnet 3311 and the second center magnet 3312 respectively, so that more magnetic lines of force pass through the voice coil 22, thereby increasing the magnetic field strength, effectively improving the BL value, making the magnetic lines of force more evenly distributed, and the BL(x) curve flatter, thereby reducing distortion.

[0150] In another embodiment, the edge magnet portion 34 includes a side magnet 341 disposed between the first diaphragm 211 and the second diaphragm 212 , the side magnet 341 is located on the outside of the voice coil 22 , and the surfaces of the side magnet 341 facing the first diaphragm 211 and the second diaphragm 212 are exposed in the third cavity 13 .

[0151] In this embodiment, if Figure 7 As shown, by configuring the side magnet portion 34 as a single side magnet 341, that is, by having only one side magnet 341 along the first direction, the side magnets 341 form a magnetic circuit with the two center magnets 331, and the magnetic flux lines are concentrated and guided through the voice coil 22 within the magnetic gap 35. This increases the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, thereby improving the acoustic performance of the sound-generating device 100. At the same time, the side washers of the side magnet portion 34 are eliminated, thereby reducing the thickness of the sound-generating device 100 in the Z direction.

[0152] Optionally, the side magnets 341 are magnetized in a direction perpendicular to the first direction, and the polarity of the magnetic poles of the side magnets 341 facing the voice coil 22 is the same as the polarity of the magnetic poles at the ends of the two center magnets 331 that are away from each other. It will be appreciated that the magnetization direction of the side magnets 341 is perpendicular to the magnetization direction of the center magnets 331.

[0153] As will be appreciated, to further guide the magnetic flux lines of the magnetic circuit through the voice coil 22 within the magnetic gap 35, a side magnetic conductive plate 342 is provided on the side of the side magnet 341 facing the voice coil 22. In this embodiment, the thickness of the side magnetic conductive plate 342 along the first direction is no greater than the thickness of the side magnet 341 along the first direction. Optionally, the length of the side magnetic conductive plate 342 along the direction perpendicular to the first direction is no greater than half the length of the side magnet 341 along the direction perpendicular to the first direction.

[0154] In this embodiment, the thickness of the side magnets 341 along the first direction is less than the extension length of the voice coil 22 along the first direction, and is not less than 1 / 5 of the extension length of the voice coil 22 along the first direction. Optionally, the thickness of the side magnets 341 along the first direction is less than the thickness of the center magnets 331 along the first direction, and is not less than 1 / 5 of the thickness of the center magnets 331 along the first direction. This configuration ensures that the side magnets 341 and the two center magnets 331 form a magnetic circuit, and guides the magnetic flux lines to pass through the voice coil 22 within the magnetic gap 35, thereby increasing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thereby improving performance and the acoustic performance of the sound-generating device 100, which is not limited here.

[0155] In yet another embodiment, the side magnet portions 34 form a Halbach magnetic circuit, which has a magnetic field-enhancing side facing the voice coil 22 and a magnetic field-weakening side facing away from the voice coil 22. As will be appreciated, by configuring the side magnet portions 34 as Halbach magnetic circuits, the Halbach magnetic circuits further enhance the magnetic field strength of the magnetic circuit formed with the two center magnets 331. This increases the density of magnetic flux lines passing through the voice coil 22 within the magnetic gap 35, thereby enhancing the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thereby improving performance and the acoustic performance of the sound-generating device 100.

[0156] In this embodiment, if Figure 8 As shown, the Halbach magnetic circuit includes a first side magnet 343, a second side magnet 344 and a third side magnet 345 stacked along a first direction. The first side magnet 343 and the third side magnet 345 are magnetized along the first direction in opposite directions. The second side magnet 344 is magnetized in a direction perpendicular to the first direction. The polarity of the magnetic pole of the second side magnet 344 facing the voice coil 22 is the same as the polarity of the magnetic pole at one end of the two center magnets 331 away from each other. The polarity of the magnetic pole at one end of the two center magnets 331 away from each other is opposite to the polarity of the magnetic pole at one end of the first side magnet 343 and the third side magnet 345 away from each other.

[0157] It can be understood that the first side magnet 343 and the first center magnet 3311 form a magnetic circuit, and the third side magnet 345 and the second center magnet 3312 form a magnetic circuit, so that the magnetic flux lines of the two magnetic circuits are gathered to the second side magnet 344, and are further enhanced by the second side magnet 344 and pass through the voice coil 22 in the magnetic gap 35. This further increases the density of the magnetic flux lines, increases the magnetic field driving force acting on the voice coil 22, effectively increases the BL value, and thus improves the performance and the acoustic performance of the sound-emitting device 100.

[0158] In one embodiment, the magnetic circuit system 3 also includes a first magnetic yoke 31 and a second magnetic yoke 32 arranged opposite to each other, and the two center magnets 331 include a first center magnet 3311 and a second center magnet 3312. The side of the first center magnet 3311 facing away from the vibration plate 213 is connected to the first magnetic yoke 31, and the side of the second center magnet 3312 facing away from the vibration plate 213 is connected to the second magnetic yoke 32; wherein, a first cavity 314 is formed between the first diaphragm 211, the voice coil 22, the vibration plate 213 and the first magnetic yoke 31, and a second cavity 324 is formed between the second diaphragm 212, the voice coil 22, the vibration plate 213 and the second magnetic yoke 32, and the first magnetic yoke 31 and the second magnetic yoke 32 are respectively provided with a first sound outlet 313 and a second sound outlet 323.

[0159] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4 、 Figures 6 to 8As shown, by arranging the first magnetic yoke 31 and the second magnetic yoke 32, the first magnetic yoke 31 and the second magnetic yoke 32 are arranged relative to each other, so that the first magnetic yoke 31 and the second magnetic yoke 32 can be used to respectively install and fix the two center magnets 331, and at the same time, the magnetic lines of force of the two center magnets 331 are gathered to form a magnetic circuit.

[0160] As will be understood, the side of the first central magnet 3311 facing away from the vibration plate 213 is connected to the first magnetic yoke 31, and the side of the second central magnet 3312 facing away from the vibration plate 213 is connected to the second magnetic yoke 32. Optionally, the projected area of ​​the first magnetic yoke 31 along the first direction is greater than or equal to the projected area of ​​the first central magnet 3311 along the first direction, and the projected area of ​​the second magnetic yoke 32 along the first direction is greater than or equal to the projected area of ​​the second central magnet 3312 along the first direction. This not only ensures the installation and fixation of the first central magnet 3311 and the second central magnet 3312, but also provides a magnetic focusing effect.

[0161] In this embodiment, if Figures 4 to 10 As shown, a first cavity 314 is formed between the first diaphragm 211, the voice coil 22, the vibration plate 213, and the first magnetic yoke 31, and a second cavity 324 is formed between the second diaphragm 212, the voice coil 22, the vibration plate 213, and the second magnetic yoke 32, so that the first central magnet 3311 is located in the first cavity 314, and the second central magnet 3312 is located in the second cavity 324. It can be understood that the first magnetic yoke 31 is provided with a first sound outlet 313 connected to the first cavity 314, and the second magnetic yoke 32 is provided with a second sound outlet 323 connected to the second cavity 324, thereby achieving double-sided sound emission of the sound-emitting device 100.

[0162] To improve the sound effect, ensure smooth airflow within the first cavity 314 and the second cavity 324, and reduce weight, the first magnetic yoke 31 is provided with a plurality of first sound holes 313, which are spaced apart. The second magnetic yoke 32 is provided with a plurality of second sound holes 323, which are spaced apart, and the second sound holes 323 are spaced apart.

[0163] In one embodiment, the first magnetic yoke 31 is provided with a first recessed groove corresponding to the first central magnet 3311, and the first central magnet 3311 is disposed within the first recessed groove. As will be appreciated, this arrangement utilizes the first recessed groove to position the first central magnet 3311, improving installation stability. Furthermore, it reduces the assembly height between the first central magnet 3311 and the first magnetic yoke 31, increasing the vibration space of the vibration plate 213.

[0164] In this embodiment, the first recessed groove may be formed by a recess on the side of the first magnetic yoke 31 facing the first center magnet 3311, in which case the first magnetic yoke 31 is flat and faces away from the first center magnet 3311; or, the first recessed groove may be formed by bending the first magnetic yoke 31 toward the side away from the first center magnet 3311, in which case the side of the first magnetic yoke 31 facing away from the first center magnet 3311 is raised at the position corresponding to the first recessed groove, which is not limited here.

[0165] In one embodiment, the second magnetic yoke 32 is provided with a second recessed groove corresponding to the second central magnet 3312, and the second central magnet 3312 is disposed within the second recessed groove. As will be appreciated, this arrangement allows the second central magnet 3312 to be positioned and installed using the second recessed groove, improving installation stability. Furthermore, the assembly height between the second central magnet 3312 and the second magnetic yoke 32 can be reduced, thereby increasing the vibration space of the vibration plate 213.

[0166] In this embodiment, the second recessed groove can be formed by being recessed on the side of the second magnetic yoke 32 facing the second center magnet 3312, in which case the second magnetic yoke 32 is flat and facing away from the second center magnet 3312; or, the second recessed groove can be formed by being bent on the side of the second magnetic yoke 32 away from the second center magnet 3312, in which case the side of the second magnetic yoke 32 facing away from the second center magnet 3312 is raised at the position corresponding to the second recessed groove, which is not limited here.

[0167] In one embodiment, the sound-emitting device 100 also includes a shell 1, which is located between the first magnetic yoke 31 and the second magnetic yoke 32, and the outer peripheries of the first diaphragm 211 and the second diaphragm 212 are respectively connected to the shell 1, and the edge magnetic plate 342 is located between the first diaphragm 211 and the second diaphragm 212 and is connected to the shell 1; wherein, the shell 1, the first diaphragm 211, the voice coil 22 and the second diaphragm 212 cooperate to form a third cavity 13, and the sound-emitting device 100 is provided with an air vent 14 connected to the third cavity 13.

[0168] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4 、 Figures 6 to 8 As shown, by providing a housing 1, the housing 1 is used to mount the fixed magnetic circuit system 3 and the vibration system 2. It can be understood that the housing 1 is located between the first magnetic yoke 31 and the second magnetic yoke 32 along the first direction, and the first magnetic yoke 31 / the second magnetic yoke 32 and the housing 1 can be connected directly or indirectly, which is not limited here.

[0169] As will be understood, the outer peripheries of the first diaphragm 211 and the second diaphragm 212 are respectively connected to the housing 1, and the edge magnet portion 34 is located between the first diaphragm 211 and the second diaphragm 212 and connected to the housing 1. In this way, the housing 1, the first diaphragm 211, the first frame 231 or bracket 24, the voice coil 22, the second frame 232 or bracket 24, and the second diaphragm 212 cooperate to form a third cavity 13. To ensure air pressure balance on opposite sides of the first diaphragm 211 and the second diaphragm 212, the sound-generating device 100 is provided with an air vent 14 that communicates with the third cavity 13.

[0170] Optionally, the housing 1 is provided with an air vent 14. Of course, in other embodiments, the air vent 14 can also be formed by the housing 1 and the edge magnetic portion 34. In one embodiment, Figure 1 As shown, the housing 1 is provided with a mounting hole 15 , and the edge magnet portion 34 is provided in the mounting hole 15 and encloses the mounting hole 15 to form an air leakage hole 14 .

[0171] It is understandable that the housing 1 may be a frame structure or a frame with both ends open. In this case, the first magnetic yoke 31 is connected to one end of the housing 1 , and the second magnetic yoke 32 is located at the end of the housing 1 away from the first magnetic yoke 31 .

[0172] In order to further improve the connection stability between the shell 1 and the edge magnetic portion 34. In one embodiment, the side magnetic conductive plate 342 and the shell 1 are an integrally molded structure. Optionally, the shell 1 is made of metal or plastic. For example, the shell 1 is made of plastic, and the side magnetic conductive plate 342 and the shell 1 are integrally injection molded; or, the shell 1 is made of metal, and the side magnetic conductive plate 342 and the shell 1 are integrally stretched. Of course, in other embodiments, the shell 1 and the side magnetic conductive plate 342 can also be connected by welding or bonding, which is not limited here.

[0173] It should be noted that the housing 1 is used to fix the magnetic circuit system 3 and the vibration system 2, and can also be used to support the first magnetic yoke 31 and the second magnetic yoke 32 of the magnetic circuit system 3, so that the first magnetic yoke 31 and the second magnetic yoke 32 are opposite to each other and spaced apart, thereby providing a vibration space for the first diaphragm 211 and the second diaphragm 212.

[0174] In one embodiment, the housing 1 includes a first shell 11 and a second shell 12 arranged along a first direction, the two ends of the first shell 11 are respectively connected to the side magnetic conductive plate 342 and the first magnetic yoke 31, and the two ends of the second shell 12 are respectively connected to the side magnetic conductive plate 342 and the second magnetic yoke 32; wherein, an air vent 14 is provided between the first shell 11 or the second shell 12 or the first shell 11 and the second shell 12.

[0175] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4As shown, by configuring the housing 1 as a split structure, the first housing 11 and the second housing 12 are arranged along a first direction, thereby utilizing the two ends of the first housing 11 to connect to the edge magnet portion 34 and the first magnetic yoke 31, respectively, and the two ends of the second housing 12 to connect to the edge magnet portion 34 and the second magnetic yoke 32, respectively, thereby achieving a connection and fixation between the housing 1 and the magnetic circuit system 3. Optionally, the edge magnet portion 34 is sandwiched between the first housing 11 and the second housing 12, and the outer surface of the edge magnet portion 34 is flush with the outer surfaces of the first housing 11 and the second housing 12; this helps to reduce the radial size of the sound-generating device 100 and facilitates miniaturization.

[0176] It can be understood that the air vent 14 can be provided in the first shell 11; or, the air vent 14 can be provided in the second shell 12; or, the first shell 11 and the second shell 12 are both provided with the air vent 14; or, the first shell 11 and the second shell 12 cooperate to form the air vent 14, that is, the air vent 14 is provided between the first shell 11 and the second shell 12, which is not limited here.

[0177] Optionally, the air leakage holes 14 include a plurality of air leakage holes 14 , which are arranged at intervals. It can be understood that such an arrangement can improve the smoothness of the air flow in the third cavity 13 .

[0178] In one embodiment, the first magnetic yoke 31 includes a first top plate portion 311 and a first side plate portion 312 arranged at an angle, the first center magnet 3311 is arranged on the first top plate portion 311, and the outer periphery of the first diaphragm 211 is clamped between the first side plate portion 312 and the outer shell 1, specifically clamped between the first side plate portion 312 and the first shell 11, and is opposite to and spaced from the first top plate portion 311; the second magnetic yoke 32 includes a second top plate portion 321 and a second side plate portion 322 arranged at an angle, the second center magnet 3312 is arranged on the second top plate portion 321, and the outer periphery of the second diaphragm 212 is clamped between the second side plate portion 322 and the outer shell 1, specifically clamped between the second side plate portion 322 and the second shell 12, and is opposite to and spaced from the second top plate portion 321.

[0179] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4 、 Figures 6 to 8 As shown, by setting the first magnetic yoke 31 as a first top plate portion 311 and a first side plate portion 312 set at an angle, the first side plate portion 312 is used to cooperate with the first shell 11 to clamp the outer periphery of the first diaphragm 211, thereby improving the connection reliability of the first diaphragm 211, and using the first shell 11 to support the first diaphragm 211 away from the edge magnetic portion 34, thereby providing a vibration space for the first diaphragm 211.

[0180] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4 、 Figures 6 to 8 As shown, by setting the second magnetic yoke 32 to be a second top plate portion 321 and a second side plate portion 322 set at an angle, the second side plate portion 322 is cooperated with the second shell 12 to clamp the outer periphery of the second diaphragm 212, thereby improving the connection reliability of the second diaphragm 212, and the second shell 12 is used to support the second diaphragm 212 away from the edge magnetic portion 34, thereby providing a vibration space for the second diaphragm 212.

[0181] In one embodiment, the first top plate portion 311 and / or the first side plate portion 312 is provided with a first sound outlet 313 .

[0182] As will be appreciated, a first cavity 314 is formed between the first magnetic yoke 31, the first diaphragm 211, and the vibration plate 213. The first cavity 314 is used to provide a vibration space for the first diaphragm 211 and also provides a mounting space for the first center magnet 3311. To ensure that the first diaphragm 211 can produce sound smoothly during vibration, the sound-generating device 100 is further provided with a first sound outlet 313 that communicates with the first cavity 314.

[0183] In this embodiment, the first top plate portion 311 of the first magnetic yoke 31 is provided with a first sound outlet 313. Alternatively, the first side plate portion 312 of the first magnetic yoke 31 is provided with the first sound outlet 313. Alternatively, both the first top plate portion 311 and the first side plate portion 312 of the first magnetic yoke 31 are provided with the first sound outlet 313, which is not limited here.

[0184] Optionally, the first top plate portion 311 is provided with a plurality of first sound holes 313, and the plurality of first sound holes 313 are arranged at intervals. Figures 1 to 4 、 Figures 6 to 8 As shown, multiple first sound holes 313 are spaced apart and arranged around the first central magnet 3311. Optionally, the multiple first sound holes 313 are all opposite the folding ring portion 2112 of the first diaphragm 211. This arrangement facilitates smooth and rapid flow of sound waves in the first cavity 314, thereby improving the sound effect.

[0185] Optionally, the first side panel 312 is provided with a plurality of first sound outlet holes 313, which are spaced apart. By providing a plurality of first sound outlet holes 313, all of the first sound outlet holes 313 are connected to the first cavity 314, thereby increasing the radiation speed and area of ​​the first sound wave within the first cavity 314, improving the sound emission effect, and achieving weight reduction.

[0186] In one embodiment, the second top plate portion 321 and / or the second side plate portion 322 is provided with a second sound outlet 323 .

[0187] As will be appreciated, a second cavity 324 is formed between the second magnetic yoke 32, the second diaphragm 212, and the vibration plate 213. The second cavity 324 is used to provide a vibration space for the second diaphragm 212 and also provides a mounting space for the second center magnet 3312. To ensure that the second diaphragm 212 can produce sound smoothly during vibration, the sound-generating device 100 is further provided with a second sound outlet 323 that communicates with the second cavity 324.

[0188] In this embodiment, the second top plate portion 321 of the second magnetic yoke 32 is provided with the first sound outlet 313. Alternatively, the second side plate portion 322 of the second magnetic yoke 32 is provided with the first sound outlet 313. Alternatively, both the second top plate portion 321 and the second side plate portion 322 of the second magnetic yoke 32 are provided with the first sound outlet 313, which is not limited here.

[0189] Optionally, the second top plate portion 321 is provided with a plurality of second sound holes 323, and the plurality of second sound holes 323 are arranged at intervals. Figure 3 、 Figure 4 、 Figures 6 to 8 As shown, multiple second sound holes 323 are spaced apart and arranged around the second central magnet 3312. Optionally, the multiple second sound holes 323 are all opposite to the fold 2112 of the second diaphragm 212. This arrangement facilitates smooth and rapid flow of sound waves in the second cavity 324, thereby improving the sound effect.

[0190] Optionally, the second side plate 322 is provided with a plurality of second sound outlet holes 323, which are spaced apart. By providing a plurality of second sound outlet holes 323, all of the second sound outlet holes 323 are connected to the second cavity 324, thereby increasing the radiation speed and area of ​​the second sound wave in the second cavity 324, improving the sound emission effect, and achieving weight reduction.

[0191] It should be noted that the first sound outlet 313 of the sound-emitting device 100 is provided on the first top plate portion 311 and is opposite to the first diaphragm 211, and the second sound outlet 323 is provided on the second top plate portion 321 and is opposite to the second diaphragm 212. When the sound-emitting device 100 is used in an electronic device or a sound-emitting module, the housing of the electronic device or the sound-emitting module is provided with sound outlets that are directly opposite to the first sound outlet 313 and the second sound outlet 323, respectively. This allows the electronic device or the sound-emitting module to have a positive sound-emitting structure, that is, the sound waves emitted from the first sound outlet 313 and the second sound outlet 323 of the sound-emitting device 100 form a dipole, thereby effectively reducing sound leakage.

[0192] Of course, in other embodiments, the first sound outlet 313 of the sound-emitting device 100 is provided on the first side panel portion 312, and the second sound outlet 323 is provided on the second side panel portion 322. When the sound-emitting device 100 is applied to an electronic device or a sound-emitting module, the sound outlet on the shell of the electronic device or the sound-emitting module is located on one side of the sound-emitting device 100, so that the sound outlet is connected to the first sound outlet 313 / the second sound outlet 323 through the sound outlet channel, thereby making the electronic device or the sound-emitting module have a side sound-emitting structure.

[0193] In one embodiment, the vibration system 2 also includes a centering support plate 25 provided in the third cavity 13. The centering support plate 25 includes an external fixing portion 251, an internal fixing portion 252, and an elastic arm portion 253 connecting the external fixing portion 251 and the internal fixing portion 252. The external fixing portion 251 is connected to the outer shell 1, and the internal fixing portion 252 is connected to the voice coil 22.

[0194] In this embodiment, if Figure 1 and Figure 3 As shown, by providing a centering support plate 25, one end of the centering support plate 25 is connected to the housing 1, and the other end of the centering support plate 25 is connected to the voice coil 22. In this way, the centering support plate 25 can be used to center the voice coil 22, thereby preventing the voice coil 22 from polarizing or swinging during the vibration process, thereby improving the operating stability of the vibration system 2.

[0195] Understandably, Figure 3 As shown, by configuring the centering support 25 as an outer fixing portion 251, an elastic arm portion 253, and an inner fixing portion 252, the outer fixing portion 251 is connected to the housing 1. The inner fixing portion 252 is provided with a first soldering pad. When the inner fixing portion 252 is connected to the voice coil 22, the lead of the voice coil 22 is electrically connected to the first soldering pad. Thus, the centering support 25 can also achieve electrical connection between an external circuit and the voice coil 22. Optionally, the elastic arm portion 253 has at least one bent section.

[0196] Optionally, the outer fixing portion 251 of the centering support 25 is sandwiched between the first shell 11 and the second shell 12 of the housing 1 .

[0197] It should be noted that the centering support piece 25 can be one or more. When there is one centering support piece 25, the outer fixing portion 251 of the centering support piece 25 is annular, and the elastic arm portion 253 and the inner fixing portion 252 include multiple ones, for example, the elastic arm portion 253 includes two or four, and the inner fixing portion 252 includes four, etc., which is not limited here. When there are multiple centering support pieces 25, the outer fixing portion 251, the elastic arm portion 253 and the inner fixing portion 252 all include multiple ones. In this case, the centering support pieces 25 can be two or four. For example, when there are two centering support pieces 25, the two centering support pieces 25 are symmetrically arranged and distributed along the long axis or short axis of the outer shell 1; or, when there are four centering support pieces 25, the four centering support pieces 25 are arranged corresponding to the four corners of the outer shell 1, which is not limited here.

[0198] In one embodiment, if Figures 3 to 5 As shown, the voice coil 22 includes two long sides 221 and two short sides 222 connected end to end, and the side magnetic portion 34 includes two side magnetic conductive plates 342. The two side magnetic conductive plates 342 are symmetrically arranged on opposite sides of the voice coil 22, and are respectively opposite to and spaced from the two long sides 221, and the two side magnetic conductive plates 342 extend respectively along the extension direction of the long sides 221.

[0199] Of course, in other embodiments, there are four edge magnetic portions 34 , two edge magnetic portions 34 are opposite to and spaced apart from the two long sides 221 , and the other two edge magnetic portions 34 are opposite to and spaced apart from the two short sides 222 , which is not limited here.

[0200] In this embodiment, if Figures 3 to 8 As shown, the side magnet parts 34 include two side magnet parts 34 symmetrically disposed on opposite sides of the voice coil 22 , and respectively opposite to and spaced from the two long sides 221 , and the two side magnet parts 34 extend along the extension direction of the long sides 221 .

[0201] When the centering support piece 25 includes one, the outer fixing portion 251 is annular, and the elastic arm portions 253 and the inner fixing portions 252 each include four. The two ends of each elastic arm portion 253 are respectively connected to the outer fixing portion 251 and an inner fixing portion 252. The four elastic arm portions 253 and the four inner fixing portions 252 are all located on the inner side of the outer fixing portion 251, and two elastic arm portions 253 and two inner fixing portions 252 are arranged corresponding to one short side 222, and the other two elastic arm portions 253 and the other two inner fixing portions 252 are arranged corresponding to the other short side 222.

[0202] When there are two centering supports 25, the two centering supports 25 are respectively disposed corresponding to the two short sides 222. It is understandable that each centering support 25 includes an outer fixing portion 251, at least one elastic arm portion 253 and two inner fixing portions 252, which is not limited here.

[0203] When there are four centering supports 25, two centering supports 25 are provided at the ends of one short side 222, and the other two centering supports 25 are provided at the ends of the other short side 222. It is understood that each centering support 25 includes an outer fixing portion 251, an elastic arm portion 253, and an inner fixing portion 252, which is not limited here.

[0204] In this embodiment, each of the elastic arm portions 253 and the internal fixing portions 252 includes four, and the two ends of each elastic arm portion 253 are respectively connected to the external fixing portion 251 and an internal fixing portion 252, and two elastic arm portions 253 and two internal fixing portions 252 are arranged corresponding to one short side 222, and the other two elastic arm portions 253 and the other two internal fixing portions 252 are arranged corresponding to the other short side 222.

[0205] The present invention further provides an electronic device comprising the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is similar to that of the aforementioned embodiments. Since the present electronic device utilizes all the technical solutions of all the aforementioned embodiments, it at least has all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and thus will not be described in detail here.

[0206] Optionally, the electronic device may be a mobile phone, earphones, a computer, a PAD, a smart wearable device, etc., and the present invention does not impose any specific restrictions on this.

[0207] In this embodiment, the electronic device is provided with an installation cavity and a first sound outlet and a second sound outlet connected to the installation cavity. The sound-emitting device 100 is provided in the installation cavity. The first sound outlet 313 of the sound-emitting device 100 is connected to the first sound outlet, and the second sound outlet 323 of the sound-emitting device 100 is connected to the second sound outlet.

[0208] It can be understood that the electronic device also includes a device housing, which is provided with an installation cavity and a first sound outlet and a second sound outlet connected to the installation cavity. The sound-emitting device 100 is arranged in the installation cavity of the device housing, and the first sound outlet 313 of the sound-emitting device 100 is connected to the first sound outlet, and the second sound outlet 323 of the sound-emitting device 100 is connected to the second sound outlet.

[0209] In one embodiment, the electronic device is smart glasses, which include temples, each of which is provided with a mounting cavity, a first sound outlet, and a second sound outlet; wherein the first sound outlet and the second sound outlet are located on two opposite surfaces of the temple along a first direction, and one of the surfaces faces the user's ear.

[0210] It is understood that smart glasses can be AR / VR / MR glasses, etc., which is not limited here. In this embodiment, by disposing the sound-generating device 100 in the mounting cavity of the glasses leg, the sound-generating device 100 divides the mounting cavity of the glasses leg into two front cavities and a rear cavity. To facilitate sound emission and air release, the glasses leg is further provided with a first sound outlet and a second sound outlet respectively connecting the two front cavities, and an air release port connecting the rear cavity.

[0211] Optionally, the first sound outlet and the second sound outlet are located on two opposite surfaces of the glasses leg along the first direction, and one of the surfaces faces the ear of the user.

[0212] In this embodiment, the height of the temple is the height of the temple along the first direction, and the thickness of the temple is the thickness of the temple along the second direction. The height of the temple corresponds to the height of the sound-emitting device 100 along the first direction, and the thickness of the temple corresponds to the width of the sound-emitting device 100. It can be understood that by locating the first sound outlet and the second sound outlet on two opposite surfaces of the temple along the first direction, less space is occupied in the thickness direction of the temple, the entire product can be made thinner, and the comfort of the user when wearing the temple of the smart glasses is improved.

[0213] It should be noted that the first sound outlet 313 and the second sound outlet 323 of the sound-emitting device 100 are respectively connected to the two front cavities, and the air discharge hole 14 of the sound-emitting device 100 is connected to the rear cavity. In this way, the smart glasses can make sounds through the first sound outlet and the second sound outlet, and discharge air through the air discharge hole, and use the sound waves radiated outward from the first sound outlet and the second sound outlet. From a fixed position at a relatively far distance in the environment, since the positions of the two sound waves are relatively close, it can be considered that the distances of the fixed position relative to the two sound waves are approximately the same, so that the two sound waves will produce two equal and opposite sound fields. Therefore, the fixed position will receive two equal and opposite phase sound waves. According to the superposition effect of dipoles, the sound waves at the fixed position can be offset to the greatest extent, which greatly improves the sound leakage problem of the smart glasses during use, protects the user's privacy, and improves the user experience.

[0214] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: a vibration system comprising a diaphragm assembly and a voice coil, the diaphragm assembly comprising a first diaphragm, a second diaphragm, and a vibration plate, the first diaphragm and the second diaphragm both vibrating in a first direction, the first diaphragm and the second diaphragm being spaced apart along the first direction and respectively connected to both ends of the voice coil along the first direction, the vibration plate being located inside the voice coil, and the outer periphery of the vibration plate being disposed in contact with the inner circumferential wall of the voice coil; and A magnetic circuit system comprising a central magnetic portion and a side magnetic portion, wherein the side magnetic portion comprises a side magnetic plate located outside the voice coil, the side magnetic plate being disposed between the first diaphragm and the second diaphragm, the central magnetic portion comprising two central magnets disposed oppositely and spaced apart along the first direction, the two central magnets being located on either side of the diaphragm along the first direction, the two central magnets being magnetized along the first direction in opposite directions, and the side magnetic portion and the central magnetic portion cooperating to form a magnetic gap for accommodating the voice coil; In which, the sound-emitting device is formed with a first cavity and a second cavity located on both sides of the vibration plate along the first direction, and a third cavity located between the first diaphragm and the second diaphragm. The two center magnets are exposed to the first cavity and the second cavity respectively on the side facing the vibration plate, and the side of the side magnetic conductive plate facing the first diaphragm and the second diaphragm are exposed to the third cavity. The sound-emitting device is also provided with a first sound outlet hole and a second sound outlet hole respectively connecting the first cavity and the second cavity.

2. The sound-generating device according to claim 1, wherein: The thickness of the side magnetic conductive plate along the first direction is less than the extension length of the voice coil along the first direction, and is not less than 1 / 10 of the extension length of the voice coil along the first direction; or the thickness of the side magnetic conductive plate along the first direction is less than the thickness of the center magnet along the first direction, and is not less than 1 / 10 of the thickness of the center magnet along the first direction; And / or, a projection of the edge magnetic conductive plate along a direction perpendicular to the first direction is located within an extension length range of the voice coil along the first direction.

3. The sound-generating device according to claim 1, wherein: The projections of the two central magnets along the first direction are located inside the voice coil; And / or, the vibration plate corresponds to the middle position of the voice coil along the first direction; And / or, the magnetic energy products of the two central magnets are the same; And / or, the two central magnets are symmetrically arranged relative to the vibration plate; And / or, the first diaphragm and the second diaphragm are symmetrically arranged relative to the vibration plate; And / or, the thickness of the vibration plate along the first direction is smaller than the extension length of the voice coil along the first direction; And / or, the voice coil is an integrally wound structure and extends along the first direction; or, the voice coil includes a first sub-voice coil and a second sub-voice coil provided on opposite sides of the vibration plate, and the first diaphragm and the second diaphragm are respectively connected to ends of the first sub-voice coil and the second sub-voice coil that are opposite to each other along the first direction; And / or, a peripheral edge of the vibration plate is bent and extended toward the inner surface of the voice coil to form an extension portion, and the extension portion is connected to the inner surface of the voice coil.

4. The sound-generating device according to claim 1, wherein: The vibration system further includes a first frame and a second frame, wherein two ends of the first frame along the first direction are respectively connected to the first diaphragm and one end of the voice coil, and two ends of the second frame along the first direction are respectively connected to the second diaphragm and the other end of the voice coil; The first diaphragm and the second diaphragm each include an inner connecting portion, a folded ring portion arranged around the inner connecting portion, and an outer connecting portion arranged around the folded ring portion. The inner connecting portion is connected to an end of the first skeleton or the second skeleton away from the voice coil.

5. The sound-generating device according to claim 4, wherein: The two folding ring parts are both protruding toward the edge magnetic part; And / or, the sound-generating device further comprises a housing, and the two external connecting portions are respectively connected to two ends of the housing along the first direction, so that the housing, the first diaphragm, the first skeleton, the voice coil, the second skeleton, and the second diaphragm enclose the third cavity; wherein the edge magnetic plate and the housing are an integrally formed structure; And / or, the first diaphragm and the vibration plate radiate a first sound wave into the first cavity, and the second diaphragm and the vibration plate radiate a second sound wave into the second cavity, and the first sound wave and the second sound wave have opposite phases; And / or, one end of the first frame and / or the second frame adjacent to the inner connecting portion is bent and extended toward the inner connecting portion to form a first bent portion, and the first bent portion is connected to the inner connecting portion; And / or, the first skeleton and / or the second skeleton are bent and extended at one end adjacent to the voice coil to form a second bent portion, and the second bent portion is connected to the end of the voice coil; or, the first skeleton and / or the second skeleton are extended along the inner surface of the voice coil at one end adjacent to the voice coil and are connected to the inner surface of the voice coil.

6. The sound-generating device according to claim 1, wherein: The magnetic circuit system further includes a first magnetic yoke and a second magnetic yoke disposed opposite to each other, the two central magnets including a first central magnet and a second central magnet, the first central magnet being connected to the first magnetic yoke on a side facing away from the vibration plate, and the second central magnet being connected to the second magnetic yoke on a side facing away from the vibration plate; The first cavity is formed between the first diaphragm, the voice coil, the vibration plate and the first magnetic yoke, and the second cavity is formed between the second diaphragm, the voice coil, the vibration plate and the second magnetic yoke. The first magnetic yoke and the second magnetic yoke are respectively provided with the first sound outlet and the second sound outlet.

7. The sound-generating device according to claim 6, wherein: The sound-generating device further includes a housing, the housing being located between the first magnetic yoke and the second magnetic yoke, the outer peripheries of the first diaphragm and the second diaphragm being connected to the housing respectively, and the edge magnetic conductive plate being located between the first diaphragm and the second diaphragm and connected to the housing; The housing, the first diaphragm, the voice coil and the second diaphragm cooperate to form the third cavity, and the sound-generating device is provided with an air vent connected to the third cavity.

8. The sound-generating device according to claim 7, wherein: The housing is provided with a mounting hole, the edge magnet is arranged in the mounting hole, and is enclosed with the mounting hole to form the air leakage hole; And / or, the side magnetic conductive plate and the housing are an integrally formed structure; And / or, the housing is made of metal or plastic; And / or, the outer shell includes a first shell and a second shell arranged along the first direction, the two ends of the first shell are respectively connected to the side magnetic conductive plate and the first magnetic yoke, and the two ends of the second shell are respectively connected to the side magnetic conductive plate and the second magnetic yoke; wherein the air vent is provided between the first shell or the second shell or the first shell and the second shell.

9. The sound-generating device according to claim 7, wherein: The first magnetic yoke includes a first top plate portion and a first side plate portion arranged at an angle, the first central magnet is provided on the first top plate portion, and the outer periphery of the first diaphragm is sandwiched between the first side plate portion and the housing and is opposite to and spaced from the first top plate portion; The second magnetic yoke includes a second top plate portion and a second side plate portion arranged at an angle, the second central magnet is provided on the second top plate portion, and the outer periphery of the second diaphragm is sandwiched between the second side plate portion and the housing and is opposite to and spaced from the second top plate portion; Wherein, the first top plate portion and / or the first side plate portion is provided with the first sound outlet hole, and the second top plate portion and / or the second side plate portion is provided with the second sound outlet hole.

10. The sound generating device according to claim 7, wherein: The vibration system further includes a centering support provided in the third cavity, the centering support including an outer fixing portion, an inner fixing portion, and an elastic arm portion connecting the outer fixing portion and the inner fixing portion, the outer fixing portion being connected to the housing, and the inner fixing portion being connected to the voice coil; In which, the voice coil includes two long sides and two short sides connected end to end, the side magnetic part includes two side magnetic conductive plates, and the two side magnetic conductive plates are symmetrically arranged on opposite sides of the voice coil and extend respectively along the extension direction of the long sides. The elastic arm part and the internal fixed part each include four, and the two ends of each elastic arm part are respectively connected to the external fixed part and one internal fixed part, and two elastic arm parts and two internal fixed parts are arranged corresponding to one short side, and the other two elastic arm parts and the other two internal fixed parts are arranged corresponding to the other short side.

11. An electronic device, characterized in that: The electronic device comprises a sound-generating device according to any one of claims 1 to 10; The electronic device is provided with an installation cavity and a first sound outlet and a second sound outlet connected to the installation cavity. The sound-emitting device is provided in the installation cavity. The first sound outlet of the sound-emitting device is connected to the first sound outlet, and the second sound outlet of the sound-emitting device is connected to the second sound outlet.

12. The electronic device according to claim 11, wherein: The electronic device is a pair of smart glasses, which include temples, each of which is provided with the mounting cavity, the first sound outlet, and the second sound outlet; The first sound outlet and the second sound outlet are located on two opposite surfaces of the glasses leg along the first direction, and one of the surfaces faces the ear of the user.

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