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 arranged at intervals 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 magnet part is arranged between the first diaphragm and the second diaphragm and is located on the outer side of the voice coil. First and second magnetic groups of a center magnetic part are arranged on both sides of the vibrating plate along the first direction. The second magnet of the first magnetic group and the third magnet of the second magnetic group are magnetized along the first direction and in opposite directions. The magnetization directions of the first magnet of the first magnetic group and the fourth magnet of the second magnetic group are perpendicular to the magnetization directions of the second magnet and the third magnet. The sound generating device forms first and second cavities on both sides of the vibrating plate and is provided with first and second sound holes. 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, the side magnetic portion being disposed between the first diaphragm and the second diaphragm and located outside the voice coil, the central magnetic portion comprising a first magnetic group and a second magnetic group disposed opposite and spaced apart along the first direction, the first magnetic group and the second magnetic group being located on opposite sides of the diaphragm along the first direction, the side magnetic portion and the central magnetic portion cooperating to form a magnetic gap for accommodating the voice coil;

[0008] The first magnetic group includes a first magnet and a second magnet stacked along the first direction, the second magnetic group includes a third magnet and a fourth magnet stacked along the first direction, the second magnet and the third magnet forming surfaces of the first magnetic group and the second magnetic group respectively on the side facing the vibration plate, the second magnet and the third magnet are magnetized along the first direction and in opposite directions, the magnetization directions of the first magnet and the fourth magnet are perpendicular to the magnetization directions of the second magnet and the third magnet, and the polarity of the magnetic poles on the side of the first magnet and the fourth magnet facing the voice coil is the same as the polarity of the magnetic poles on the side of the second magnet and the third magnet facing away from the vibration plate;

[0009] The sound-generating device is formed with a first cavity and a second cavity located on both sides of the vibration plate along the first direction, and is further provided with a first sound outlet hole and a second sound outlet hole respectively communicating with the first cavity and the second cavity.

[0010] In one embodiment, the second magnet is rectangular, having a first long axis and a first short axis connected end to end; wherein the first magnet comprises two, the two first magnets being arranged flat on a side of the second magnet facing away from the vibration plate, adjacent to and parallel to each other along the direction of the first long axis, and having opposite magnetization directions of the two first magnets;

[0011] And / or, the third magnet is rectangular, and has a second long axis side and a second short axis side connected end to end; wherein, the fourth magnet includes two, the two fourth magnets are flatly arranged on the side of the third magnet facing away from the vibration plate, and are adjacent and arranged in parallel along the direction of the second long axis, and the magnetization directions of the two fourth magnets are opposite.

[0012] In one embodiment, projections of the first magnetic group and the second magnetic group along the first direction are located inside the voice coil;

[0013] And / or, the thickness of the edge magnet portion along the first direction is greater than the extension length of the voice coil along the first direction, and is not greater than 3 times the extension length of the voice coil along the first direction;

[0014] And / or, the thickness of the second magnet along the first direction is not less than 1 / 5 of the thickness of the first magnet along the first direction;

[0015] And / or, the thickness of the third magnet along the first direction is not less than 1 / 5 of the thickness of the fourth magnet along the first direction;

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

[0017] And / or, the first magnetic group and the second magnetic group are symmetrically arranged relative to the vibration plate;

[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 skeleton and a second skeleton, wherein the two ends of the first skeleton along the first direction are respectively connected to the first diaphragm and one end of the voice coil, and the two ends of the second skeleton along the first direction are respectively connected to the second diaphragm and the other end of the voice coil.

[0021] In one embodiment, 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, and 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 parts are respectively connected to two ends of the housing along the first direction;

[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 edge magnet portion includes two edge magnets stacked along the first direction and an edge magnetic conductive plate disposed between the two edge magnets;

[0028] The two side magnets are magnetized along the first direction and in opposite directions, and the polarity of the magnetic poles at the ends of the two side magnets away from each other is opposite to the polarity of the magnetic poles at the ends of the second magnet and the third magnet away from each other.

[0029] In one embodiment, the edge magnet portion includes a first edge magnet, a second edge magnet, and a third edge magnet stacked along the first direction, the first edge magnet and the third edge magnet are magnetized along the first direction and in opposite directions, and the second edge magnet is magnetized in a direction perpendicular to the first direction;

[0030] The magnetic pole polarity of the first side magnet and the third side magnet facing the second side magnet is the same as the magnetic pole polarity of the end of the second magnet and the third magnet away from each other, the magnetic pole polarity of the second side magnet facing the voice coil is the same as the magnetic pole polarity of the end of the second magnet and the third magnet away from each other, and the magnetic pole polarity of the end of the second magnet and the third magnet away from each other is the same as the magnetic pole polarity of the side of the first magnet and the fourth magnet facing the voice coil.

[0031] In one embodiment, the magnetic circuit system further includes a first magnetic yoke and a second magnetic yoke disposed opposite to each other, the first magnetic group is disposed on the first magnetic yoke, and the first magnet is sandwiched between the first magnetic yoke and the second magnet, the second magnetic group is disposed on the second magnetic yoke, and the fourth magnet is sandwiched between the second magnetic yoke and the third magnet;

[0032] 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.

[0033] 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 portion being located between the first diaphragm and the second diaphragm and connected to the housing;

[0034] The housing, the first diaphragm, the voice coil and the second diaphragm cooperate to form a third cavity, and the sound-generating device is provided with an air vent connected to the third cavity.

[0035] In one embodiment, the housing includes a first shell and a second shell arranged along the first direction, two ends of the first shell are respectively connected to the edge magnet portion and the first magnetic yoke, and two ends of the second shell are respectively connected to the edge magnet portion and the second magnetic yoke;

[0036] Wherein, the air leakage hole is provided in the first shell or the second shell or between the first shell and the second shell.

[0037] 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 magnetic group 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;

[0038] The second magnetic yoke includes a second top plate portion and a second side plate portion arranged at an angle, the second magnetic group is arranged 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;

[0039] 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.

[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, and utilizing 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 circumferential 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, thereby realizing that the dual diaphragms are connected and driven by one voice coil, thereby realizing the first The first diaphragm and the second diaphragm both vibrate along the first direction, which can ensure 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 arranging the side magnetic part of the magnetic circuit system between the first diaphragm and the second diaphragm, and on the outside of the voice coil, and the first magnetic group and the second magnetic group 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, and the first magnetic group is arranged to be stacked along the first direction The first magnet and the second magnet are set, and the second magnetic group is set as the third magnet and the fourth magnet stacked along the first direction, so that the second magnet of the first magnetic group and the third magnet of the second magnetic group are magnetized along the first direction and the magnetization directions are opposite, and the second magnet and the third magnet are exposed in the first cavity and the second cavity respectively on the side facing the vibration plate, and the magnetization direction of the first magnet of the first magnetic group and the fourth magnet of the second magnetic group is set to be perpendicular to the magnetization direction of the second magnet and the third magnet. 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 second magnet of the first magnetic group and the third magnet of the second magnetic group, thereby The magnetic force on the voice coil is enhanced, and the voice coil is in the magnetic gap formed by the side magnet part and the center magnet part. Under the action of the counter-magnetic structure formed by the second magnet and the third magnet and the side magnet part, the first magnet of the first magnetic group is used to further strengthen the magnetic field strength of the magnetic circuit formed by the second magnet and the side magnet part, and the fourth magnet of the second magnetic group is used to further strengthen the magnetic field strength of the magnetic circuit formed by the third magnet and the side magnet part. In this way, the magnetic force 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, and thus improving the performance and the acoustic performance of the sound-emitting device. 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 1 A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention;

[0047] Figure 2 A schematic top view of the structure of an embodiment of the 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 cross-sectional schematic diagram of a first embodiment of the 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 partial cross-sectional schematic diagram of a second embodiment of the sound-generating device provided by the present invention;

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

[0053] Figure 8 A partial cross-sectional schematic diagram 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 16 A 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 A schematic top view of the first embodiment of the first magnet and the fourth magnet provided by the present invention;

[0065] Figure 20 A schematic top view of the structure of the first magnet and the fourth magnet according to the second embodiment of the present invention;

[0066] Figure 21 A schematic top view of the structure of a third embodiment of the first magnet and the fourth magnet provided by the present invention;

[0067] Figure 22 A schematic top view of a fourth embodiment of the first magnet and the fourth magnet provided by the present invention;

[0068] Figure 23 A schematic diagram of a simulation effect of an embodiment of a sound-generating device provided by the present invention;

[0069] Figure 24 This is a BL curve diagram of the sound-generating device provided by the present invention and the prior art.

[0070] Description of Figure Numbers:

[0071] 100. Sound-generating device; 1. Housing; 11. First housing; 12. Second housing; 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 frame; 232. Second frame; 233. First bending portion; 234. Second bending portion; 24. Bracket; 241. Side 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. Central magnetic part; 331. First magnetic group; 3311. First magnet; 3312. Second magnet; 332. Second magnetic group; 3321. Third magnet; 3322. Fourth 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.

[0072] 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

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] Please refer to Figures 1 to 22As shown, in the 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 side of the vibration plate 213 is located on the inner side of the voice coil 22. The inner circumference of the diaphragm 213 is abutted against the inner circumference 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 outside of the voice coil 22. The central magnetic portion 33 includes a first magnetic group 331 and a second magnetic group 332 that are opposite and spaced apart along a first direction. The first magnetic group 331 and the second magnetic group 332 are located on both sides of the vibration plate 213 along the first direction. The side magnetic portion 34 cooperates with the central magnetic portion 33 to form a magnetic gap 35 for accommodating the voice coil 22. Among them, the first magnetic group 331 The first magnet 3311 and the second magnet 3312 are stacked in a first direction. The second magnetic group 332 includes a third magnet 3321 and a fourth magnet 3322 stacked in the first direction. The second magnet 3312 and the third magnet 3321 form the surfaces of the first magnetic group 331 and the second magnetic group 332 on the side facing the vibration plate. The second magnet 3312 and the third magnet 3321 are magnetized in the first direction and in opposite directions. The magnetization directions of the first magnet 3311 and the fourth magnet 3322 are opposite to those of the second magnet 331. 2 and the magnetization direction of the third magnet 3321 are perpendicular, and the magnetic polarity of the first magnet 3311 and the fourth magnet 3322 facing the voice coil 22 is the same as the magnetic polarity of the second magnet 3312 and the third magnet 3321 facing away from the vibration plate 213; 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 the sound-emitting device 100 is further provided with a first sound outlet 313 and a second sound outlet 323 respectively communicating with the first cavity 314 and the second cavity 324.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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 first magnetic group 331 and the second magnetic group 332 of the central magnetic portion 33 are arranged opposite to each other and spaced apart along the first direction, and are located on opposite sides of the vibration plate 213 along the first direction, and the first magnetic group 331 is arranged as a first magnet 3311 and a second magnet 3312 stacked along the first direction, and the second magnetic group 332 is arranged as a third magnet 3321 and a fourth magnet 3322 stacked along the first direction, so that the second magnet 3312 of the first magnetic group 331 and the third magnet 3321 of the second magnetic group 332 are both magnetized along the first direction and in opposite directions, and the second magnet 331 2 and the third magnet 3321 are exposed in the first cavity 314 and the second cavity 324 respectively on the side facing the vibration plate 213, and the magnetization directions of the first magnet 3311 of the first magnetic group 331 and the fourth magnet 3322 of the second magnetic group 332 are arranged to be perpendicular to the magnetization directions of the second magnet 3312 and the third magnet 3321. In this way, the first magnetic group 331 and the second magnetic group 332 cooperate with the side magnetic portion 34 to form a vertically long magnetic field region with 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 also 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 opposing magnetic structure formed by the second magnet 3312 of the first magnetic group 331 and the third magnet 3321 of the second magnetic group 332 further enhances the magnetic field strength in the area surrounding the voice coil 22. The first magnet 3311 of the first magnetic group 331 further strengthens the magnetic field strength of the magnetic circuit formed by the second magnet 3312 and the edge magnet portion 34. Furthermore, the fourth magnet 3322 of the second magnetic group 332 further strengthens the magnetic field strength of the magnetic circuit formed by the third magnet 3321 and the edge magnet portion 34. This effectively increases the BL value and improves the acoustic performance of the sound-generating device 100. The BL value of the sound-generating device 100 of the present invention can be increased by 30% compared to conventional solutions. Where 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.

[0087] It should be noted that the vibration direction of the first diaphragm 211 and the second diaphragm 212 is the first direction, and the first direction is defined as the vertical direction, that is, the first diaphragm 211 and the second diaphragm 212 vibrate along the vertical direction. The direction perpendicular to the first direction is the second direction, and the second direction is defined as the horizontal direction. In this embodiment, the second magnet 3312 and the third magnet 3321 are magnetized along the first direction, that is, they are magnetized along the vertical direction, and the magnetization directions are opposite, and the first magnet 3311 and the fourth magnet 3322 are magnetized along the second direction, that is, they are magnetized along the horizontal direction, and the magnetization directions are the same. It can be understood that, as Figures 4 to 8 As shown, the direction of the arrow in the magnetic circuit system 3 is the direction from the S pole to the N pole, that is, the magnetization direction.

[0088] In this embodiment, if Figure 4 and Figure 5 As shown, the magnetic pole polarity of the first magnet 3311 facing the voice coil 22 is the same as the magnetic pole polarity of the second magnet 3312 facing away from the vibration plate 213; the magnetic pole polarity of the fourth magnet 3322 facing the voice coil 22 is the same as the magnetic pole polarity of the third magnet 3321 facing away from the vibration plate 213.

[0089] As can be understood, the first magnet 3311 can reduce the dispersion of the magnetic field in the magnetic circuit formed by the second magnet 3312 and the side magnet portion 34, thereby increasing the magnetic field strength. This allows the first magnetic group 331 of the central magnetic portion 33 to generate a magnetic field with a relatively strong magnetic field strength that passes through the magnetic gap 35, thereby increasing the density of the magnetic flux in the magnetic gap 35, increasing the number of magnetic lines of force passing through the voice coil 22, and increasing the magnetic field force acting on the voice coil 22, effectively improving the BL value. Simultaneously, the fourth magnet 3322 can reduce the dispersion of the magnetic field in the magnetic circuit formed by the third magnet 3321 and the side magnet portion 34, thereby increasing the magnetic field strength. This allows the second magnetic group 332 of the central magnetic portion 33 to generate a magnetic field with a relatively strong magnetic field strength that passes through the magnetic gap 35, thereby increasing the density of the magnetic flux in the magnetic gap 35, increasing the number of magnetic lines of force passing through the voice coil 22, and increasing the magnetic field force acting on the voice coil 22, effectively improving the BL value.

[0090] In this embodiment, if Figures 3 to 8 As shown, the first magnetic group 331 of the central magnetic portion 33 is located near the top of the voice coil 22, and the second magnetic group 332 is located near the bottom of the voice coil 22. It will be appreciated that the top of the voice coil 22 is the end where the voice coil 22 connects to the first diaphragm 211, and the bottom of the voice coil 22 is the end where the voice coil 22 connects to the second diaphragm 212. Optionally, the first magnetic group 331 is located within the first cavity 314, and the second magnetic group 332 is located within the second cavity 324.

[0091] Optionally, the projections of the first magnetic group 331 and the second magnetic group 332 along the first direction are located inside the voice coil 22. In this embodiment, the projections of the first magnet 3311 and the second magnet 3312 of the first magnetic group 331 along the first direction are located inside the voice coil 22, while the projections of the third magnet 3321 and the fourth magnet 3322 of the second magnetic group 332 along the first direction are located inside the voice coil 22. This prevents the voice coil 22 from rubbing against the first magnetic group 331 or the second magnetic group 332 when it vibrates. The radially outer height space of the central magnetic portion 33 is utilized to accommodate the vibration displacement of the voice coil 22, eliminating the need for additional height space between the first magnetic group 331 and the second magnetic group 332 to accommodate the vibration displacement of the voice coil 22. This facilitates a thinner design for the sound-generating device 100.

[0092] At the same time, by setting the central magnetic part 33 of the magnetic circuit system 3 to the first magnetic group 331 and the second magnetic group 332, and setting the first magnetic group 331 to the first magnet 3311 and the second magnet 3312 stacked along the first direction, the second magnetic group 332 is set to the third magnet 3321 and the fourth magnet 3322 stacked along the first direction, and the second magnet 3312 of the first magnetic group 331 and the third magnet 3321 of the second magnetic group 332 are respectively exposed to the first cavity 314 and the second cavity 324 of the sound-emitting device 100 facing the vibration plate 213, that is, the first magnet 3311 of the first magnetic group 331 is arranged on the side of the second magnet 3312 facing away from the vibration plate 213, and the fourth magnet 3322 of the second magnetic group 332 is arranged on the side of the third magnet 3321 facing away from the vibration plate 213. By magnetizing the second magnet 3312 of the first magnetic group 331 and the third magnet 3321 of the second magnetic group 332 along the first direction and in opposite directions, and setting the magnetizing direction of the first magnet 3311 of the first magnetic group 331 and the fourth magnet 3322 of the second magnetic group 332 to be perpendicular to the magnetizing direction of the second magnet 3312 and the third magnet 3321, compared with the magnetic circuit structure of a conventional speaker, the second magnet 3312 and the third magnet 3321 of the central magnetic part 33 of the present invention are opposite to each other along the first direction. The magnetic directions are opposite, forming a counter-magnetic structure, so that the magnetic lines of force generated by the second magnet 3312 and the third magnet 3321 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 more uniform magnetic field distribution, 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 super-linear BL(x) design and reducing the risk of distortion. Figure 23 and Figure 24 Moreover, the present invention effectively increases the volume of the central magnetic portion 33 and improves the BL value. Compared with the conventional solution, the BL value of the sound-generating device 100 of the present invention can be increased by 30%. Figure 24 shown.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] In this embodiment, if Figure 1 、 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 first magnetic group 331 and the second magnetic group 332 of the central 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.

[0097] It can be understood that the side magnetic portion 34 forms a magnetic circuit with the first magnetic group 331 and the second magnetic group 332 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.

[0098] 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.

[0099] The sound-generating device 100 of the present invention is configured by configuring the diaphragm assembly 21 of the vibration system 2 to include 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 a first direction and are respectively connected to the two ends of the voice coil 22 along the first direction. The vibration plate 213 is disposed inside the voice coil 22 so that the outer periphery of the vibration plate 213 abuts against the inner peripheral wall of the voice coil 22. In this way, a first cavity 3 is formed in the sound-generating device 100, which is located on both sides of the vibration plate 213 along the first direction. 14 and a second cavity 324, and a first sound outlet 313 and a second sound outlet 323 are provided on the sound-emitting device 100, which are connected to the first cavity 314 and the second cavity 324 respectively. In this way, the dual diaphragms are connected to drive the vibration plate 213 to vibrate through a voice coil 22, thereby achieving loudness consistency of the sound waves in the two cavities and completely opposite phases, so that both sides of the sound-emitting device 100 can directly emit sound. Placing the sound-emitting device 100 in the temple of the glasses of the whole device can form a "true" dipole up and down, reducing far-field leakage and ensuring privacy;At the same time, 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 first magnetic group 331 and the second magnetic group 332 of the central magnetic portion 33 are arranged opposite to each other and spaced apart along the first direction, and are located on opposite sides of the vibration plate 213 along the first direction, and the first magnetic group 331 is set as the first magnet 3311 and the second magnet 3312 stacked along the first direction, and the second magnetic group 332 is set as the third magnet stacked along the first direction. The first magnet 3311 of the first magnetic group 331 and the third magnet 3321 of the second magnetic group 332 are magnetized in the first direction and in opposite directions, and the second magnet 3312 and the third magnet 3321 are exposed to the first cavity 314 and the second cavity 324 on the side facing the vibration plate 213, respectively, and the magnetization direction of the first magnet 3311 of the first magnetic group 331 and the fourth magnet 3322 of the second magnetic group 332 is set to be opposite to that of the second magnet 3312 and the third magnet 3321. The magnetization direction of the third magnet 3321 is vertical, so the magnetic field strength in the area where the voice coil 22 is located is increased by utilizing the counter-magnetic structure formed by the second magnet 3312 of the first magnetic group 331 and the third magnet 3321 of the second magnetic group 332, thereby increasing the magnetic force on the voice coil 22. The voice coil 22 is in the magnetic gap 35 formed by the side magnetic portion 34 and the center magnetic portion 33, and under the action of the counter-magnetic structure formed by the second magnet 3312 and the third magnet 3321 and the side magnetic portion 34, and utilizing the first magnetic group 331. The first magnet 3311 further strengthens the magnetic field strength of the magnetic circuit formed by the second magnet 3312 and the edge magnet portion 34. Furthermore, the fourth magnet 3322 of the second magnetic assembly 332 further strengthens the magnetic field strength of the magnetic circuit formed by the third magnet 3321 and the edge magnet portion 34. This increases the magnetic force acting on the voice coil 22, highly concentrating the magnetic lines of force near the voice coil 22. This enhances the magnetic field driving force acting on the voice coil 22, effectively increasing the BL value, and thereby improving the acoustic performance of the sound-generating device 100.

[0100] Optionally, there may be one or more first magnets 3311. When there is only one first magnet 3311, the first magnet 3311 is magnetized in a direction perpendicular to the first direction, that is, in the second direction (horizontal direction). In this case, the magnetization direction of the first magnet 3311 can be from the center of the first magnet 3311 toward the edge of the first magnet 3311, or from the edge of the first magnet 3311 toward the center of the first magnet 3311, without limitation. Optionally, a through-hole structure is provided in the center of the first magnet 3311.

[0101] When there are multiple first magnets 3311, the number of first magnets 3311 can be two or four. Figure 3As shown, the second magnet 3312 is rectangular and has a first long axis and a first short axis connected end to end. It can be understood that the first long axis and the first short axis of the second magnet 3312 correspond to the long side 221 and the short side 222 of the voice coil 22 respectively.

[0102] In one embodiment, the first magnets 3311 include two first magnets 3311 , which are flatly arranged on the side of the second magnet 3312 facing away from the vibration plate 213 , and are adjacent and parallel arranged along the direction of the first long axis, and the magnetization directions of the two first magnets 3311 are opposite.

[0103] In this embodiment, if Figure 3 and Figure 19 As shown, there can be two first magnets 3311, and the two first magnets 3311 are adjacent to each other along the first long axis and are arranged in parallel on the side of the second magnet 3312 facing away from the vibration plate 213. The two first magnets 3311 are both magnetized in the horizontal direction, and the two first magnets 3311 are both magnetized in the direction of the first long axis, and the magnetization directions of the two first magnets 3311 are opposite.

[0104] In another embodiment, the first magnet 3311 includes two first magnets 3311, and the two first magnets 3311 are flatly arranged on the side of the second magnet 3312 facing away from the vibration plate 213, and are adjacent and parallel to each other along the direction of the first short axis. The two first magnets 3311 are magnetized along the direction of the first short axis, and the magnetization directions of the two first magnets 3311 are opposite.

[0105] In this embodiment, if Figure 3 and Figure 20 As shown, there can be two first magnets 3311, and the two first magnets 3311 are adjacent to each other and arranged in parallel along the first short axis side on the side of the second magnet 3312 facing away from the vibration plate 213. The two first magnets 3311 are both magnetized in the horizontal direction, and the two first magnets 3311 are both magnetized in the direction of the first short axis side, and the magnetization directions of the two first magnets 3311 are opposite.

[0106] In another embodiment, the first magnet 3311 includes four first magnets 3311, and the four first magnets 3311 are flatly arranged on the side of the second magnet 3312 facing away from the vibration plate 213. Two first magnets 3311 are adjacent to and arranged in parallel along the direction of the first short axis side, and the other two first magnets 3311 are arranged at both ends of the two first magnets 3311 along the direction of the first long axis side. The four first magnets 3311 are magnetized along the direction of the first short axis side and the direction of the first long axis side, respectively. The magnetization directions of the two first magnets 3311 arranged along the direction of the first short axis side are opposite, and the magnetization directions of the other two first magnets 3311 arranged along the direction of the first long axis side are opposite.

[0107] In this embodiment, if Figure 3and Figure 21 As shown, four first magnets 3311 may be provided. Two of the four first magnets 3311 are adjacent and parallel to each other along the first minor axis, and the other two are provided at both ends of the two first magnets 3311 along the first major axis, so that the four first magnets 3311 are laid flat on the side of the second magnet 3312 facing away from the vibration plate 213. The four first magnets 3311 are all magnetized horizontally. The two first magnets 3311 provided along the first minor axis are magnetized in opposite directions along the first minor axis, and the other two first magnets 3311 provided along the first major axis are magnetized in opposite directions along the first major axis.

[0108] In another embodiment, the first magnet 3311 is divided along two diagonal lines to form four first magnets 3311, and the four first magnets 3311 are laid flat on the side of the second magnet 3312 facing away from the vibration plate 213. Two first magnets 3311 are arranged in parallel along the direction of the first short axis, and the other two first magnets 3311 are arranged in parallel along the direction of the first long axis. The four first magnets 3311 are magnetized along the direction of the first short axis and the direction of the first long axis, respectively. The magnetization directions of the two first magnets 3311 arranged along the direction of the first short axis are opposite, and the magnetization directions of the other two first magnets 3311 arranged along the direction of the first long axis are opposite.

[0109] In this embodiment, if Figure 3 and Figure 22 As shown, the number of first magnets 3311 can be four, that is, the four first magnets 3311 are formed by splitting a whole magnet along two diagonal lines to form four first magnets 3311, so that the four first magnets 3311 are arranged in a triangular shape, and the vertex angles of the four first magnets 3311 coincide with the intersection of the two diagonals. The four first magnets 3311 are laid flat on the side of the second magnet 3312 facing away from the vibration plate 213. The four first magnets 3311 are magnetized in the horizontal direction. The two first magnets 3311 arranged along the first minor axis are magnetized in the direction of the first minor axis in opposite directions. The other two first magnets 3311 arranged along the first major axis are magnetized in the direction of the first major axis in opposite directions.

[0110] Optionally, there may be one or more fourth magnets 3322. When there is only one fourth magnet 3322, the fourth magnet 3322 is magnetized in a direction perpendicular to the first direction, that is, in the second direction (horizontal direction). In this case, the magnetization direction of the fourth magnet 3322 can be from the center of the fourth magnet 3322 toward the edge of the fourth magnet 3322, or from the edge of the fourth magnet 3322 toward the center of the fourth magnet 3322, without limitation. Optionally, a through-hole structure is provided in the center of the fourth magnet 3322.

[0111] When there are multiple fourth magnets 3322, the fourth magnets 3322 can be selected to be two or four. Figure 3 As shown, the third magnet 3321 is rectangular and has a second long axis and a second short axis connected end to end. It can be understood that the second long axis and the second short axis of the third magnet 3321 correspond to the long side 221 and the short side 222 of the voice coil 22 respectively.

[0112] In one embodiment, the fourth magnets 3322 include two fourth magnets 3322 , which are flatly arranged on the side of the third magnet 3321 facing away from the vibration plate 213 , and are adjacent and parallel arranged along the second long axis, and the magnetization directions of the two fourth magnets 3322 are opposite.

[0113] In this embodiment, if Figure 3 and Figure 19 As shown, the number of fourth magnets 3322 can be selected to be two, and the two fourth magnets 3322 are adjacent to each other and arranged in parallel along the second long axis on the side of the third magnet 3321 facing away from the vibration plate 213. The two fourth magnets 3322 are both magnetized in the horizontal direction, and the two fourth magnets 3322 are both magnetized in the direction of the second long axis, and the magnetization directions of the two fourth magnets 3322 are opposite.

[0114] In another embodiment, the fourth magnet 3322 includes two fourth magnets 3322, which are flatly arranged on the side of the third magnet 3321 facing away from the vibration plate 213, and are adjacent to and arranged in parallel along the direction of the second short axis. The two fourth magnets 3322 are both magnetized along the direction of the second short axis, and the magnetization directions of the two fourth magnets 3322 are opposite.

[0115] In this embodiment, if Figure 3 and Figure 20 As shown, the number of fourth magnets 3322 can be selected to be two, and the two fourth magnets 3322 are adjacent to each other and arranged in parallel along the second short axis on the side of the third magnet 3321 facing away from the vibration plate 213. The two fourth magnets 3322 are both magnetized in the horizontal direction, and the two fourth magnets 3322 are both magnetized in the direction of the second short axis, and the magnetization directions of the two fourth magnets 3322 are opposite.

[0116] In another embodiment, the fourth magnet 3322 includes four fourth magnets 3322, which are flatly arranged on the side of the third magnet 3321 facing away from the vibration plate 213, two fourth magnets 3322 are adjacent to and arranged in parallel along the direction of the second minor axis, and the other two fourth magnets 3322 are arranged at both ends of the two fourth magnets 3322 along the direction of the second major axis. The four fourth magnets 3322 are magnetized along the direction of the second minor axis and the direction of the second major axis, respectively. The magnetization directions of the two fourth magnets 3322 arranged along the second minor axis are opposite, and the magnetization directions of the other two fourth magnets 3322 arranged along the second major axis are opposite.

[0117] In this embodiment, if Figure 3 and Figure 21 As shown, four fourth magnets 3322 may be provided. Two of the four fourth magnets 3322 are adjacent and parallel to each other along the second minor axis, and the other two are provided at both ends of the two fourth magnets 3322 along the second major axis, so that the four fourth magnets 3322 are laid flat on the side of the third magnet 3321 facing away from the vibration plate 213. The four fourth magnets 3322 are all magnetized horizontally. The two fourth magnets 3322 provided along the second minor axis are magnetized along the second minor axis in opposite directions, and the other two fourth magnets 3322 provided along the second major axis are magnetized along the second major axis in opposite directions.

[0118] In yet another embodiment, the fourth magnet 3322 is divided along two diagonal lines to form four fourth magnets 3322. The four fourth magnets 3322 are laid flat on the side of the third magnet 3321 facing away from the vibration plate 213. Two fourth magnets 3322 are arranged in parallel along the direction of the second minor axis, and the other two fourth magnets 3322 are arranged in parallel along the direction of the second major axis. The four fourth magnets 3322 are magnetized along the direction of the second minor axis and the direction of the second major axis, respectively. The magnetization directions of the two fourth magnets 3322 arranged along the second minor axis are opposite, and the magnetization directions of the other two fourth magnets 3322 arranged along the second major axis are opposite.

[0119] In this embodiment, if Figure 3 and Figure 22As shown, four fourth magnets 3322 can be selected. That is, the four fourth magnets 3322 are formed by splitting a whole magnet along two diagonals, so that the four fourth magnets 3322 are arranged in a triangular shape, and the vertex angles of the four fourth magnets 3322 coincide with the intersection of the two diagonals. The four fourth magnets 3322 are laid flat on the side of the third magnet 3321 facing away from the vibration plate 213. The four fourth magnets 3322 are magnetized horizontally. The two fourth magnets 3322 arranged along the second minor axis are magnetized in the direction of the second minor axis in opposite directions. The other two fourth magnets 3322 arranged along the second major axis are magnetized in the direction of the second major axis in opposite directions.

[0120] To ensure the magnetic field strength of the magnetic circuit formed by the second magnet 3312 and the edge magnet portion 34, the thickness of the second magnet 3312 along the first direction is optionally no less than 1 / 5 of the thickness of the first magnet 3311 along the first direction. In this embodiment, the outer contour of the second magnet 3312 of the first magnetic group 331 is similar to the outer contour of the first magnet 3311. The thickness of the first magnet 3311 along the first direction is no more than five times the thickness of the second magnet 3312 along the first direction.

[0121] To ensure the magnetic field strength of the magnetic circuit formed by the third magnet 3321 and the edge magnet portion 34, the thickness of the third magnet 3321 along the first direction is not less than 1 / 5 of the thickness of the fourth magnet 3322 along the first direction. In this embodiment, the outer contour of the third magnet 3321 of the second magnetic group 332 is similar to the outer contour of the fourth magnet 3322. The thickness of the fourth magnet 3322 along the first direction is not more than 5 times the thickness of the third magnet 3321 along the first direction.

[0122] In one embodiment, the distances between the second magnet 3312 and the third magnet 3321 on both sides of the vibration plate 213 along the first direction are the same.

[0123] In this embodiment, if Figures 4 to 8As shown, along the first direction, the diaphragm 213 has a first surface facing the second magnet 3312 and a second surface facing the third magnet 3321. Optionally, the distance from the first surface to the second magnet 3312 is the same as the distance from the second surface to the third magnet 3321. This ensures that when the voice coil 22 drives the diaphragm 213 to vibrate along the first direction, collision and interference between the diaphragm 213 and the second and third magnets 3312 and 3321 are effectively avoided. Optionally, the projection of the diaphragm 213 perpendicular to the first direction is located in the middle of the voice coil 22, that is, the projection of the diaphragm 213 along the second direction is located in the middle of the voice coil 22. This makes the magnetic field lines in 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 diaphragm 213 corresponds to the middle position of the voice coil 22 along the first direction.

[0124] 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 accommodation space for the first magnetic group 331 and the second magnetic group 332 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.

[0125] To further ensure that when the voice coil 22 vibrates within the magnetic gap 35, it drives 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 magnetic energy products of the first magnetic group 331 and the second magnetic group 332 are optionally the same. In this embodiment, the magnetic energy products of the second magnet 3312 and the third magnet 3321 are the same, and the magnetic energy products of the first magnet 3311 and the fourth magnet 3322 are the same. This ensures that the magnetic field strength of the second magnet 3312 is the same as that of the third magnet 3321, and the magnetic field strength of the first magnet 3311 is the same as that of the fourth magnet 3322, thereby ensuring that the magnetic field driving force acting on the voice coil 22 is the same.

[0126] To ensure that the sound waves emitted by the first cavity 314 and the second cavity 324 have the same loudness and that the magnetic field of the magnetic gap 35 is uniform, the first magnetic group 331 and the second magnetic group 332 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.

[0127] In this embodiment, the first and second magnetic groups 331 and 332 have identical outer profiles, and the thickness ratio of the first and second magnetic groups 331 and 332 along the first direction can be selected to be between 0.5 and 2. Alternatively, the thickness ratio of the first and second magnetic groups 331 and 332 along the first direction can be selected to be 0.5, 1, 1.5, 2, or other values, without limitation. This arrangement ensures that the first and second magnetic groups 331 and 332 of the central magnetic portion 33 form a magnetic circuit with the side magnetic portions 34, thereby ensuring a high magnetic flux density within the magnetic gap 35 that passes through the voice coil 22.

[0128] 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 .

[0129] 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.

[0130] In one embodiment, the projection of the voice coil 22 along the first direction perpendicular to 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 perpendicular to the first direction is located between the first magnetic group 331 and the second magnetic group 332. In other words, the projection of the voice coil 22 along the first direction perpendicular to the first direction is located between the second magnet 3312 and the third magnet 3321.

[0131] 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 second magnet 3312 and the third magnet 3321. This ensures that the voice coil 22 can reciprocate and approach the first magnetic group 331 or the second magnetic group 332 during vibration, thereby ensuring that the magnetic force acting on the voice coil 22 remains unchanged or changes very little when it moves, 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.

[0132] It should be noted that in the case of small amplitude of the voice coil 22, the voice coil 22 is located on the surface of the side of the magnetic section 34 facing the voice coil 22 along the projection perpendicular to the first direction, and the voice coil 22 is located between the second magnet 3312 and the third magnet 3321 along the projection perpendicular to the first direction. In the case of large amplitude of the voice coil 22, only when the voice coil 22 is not vibrating, the voice coil 22 is located on the surface of the side of the magnetic section 34 facing the voice coil 22 along the projection perpendicular to the first direction, and the voice coil 22 is located between the second magnet 3312 and the third magnet 3321 along the projection perpendicular to the first direction, which is not limited herein.

[0133] In an embodiment, as shown in Figures 3 to 12 , the voice coil 22 can also be provided as an integrated structure, that is, the voice coil 22 is integrally wound and formed, 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 the assembly efficiency.

[0134] Of course, in other embodiments, the voice coil 22 can also be provided as a split structure, as shown in Figure 13 , 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 away from the first direction, which is not limited herein.

[0135] In order to further improve the connection stability of the vibration plate 213, in an embodiment, as shown in Figure 12 , the periphery of the vibration plate 213 is bent and extended towards the inner surface of the voice coil 22 to form an extension 2131, and the extension 2131 is connected to the inner surface of the voice coil 22. It can be understood that by bending and extending the periphery of the vibration plate 213 to form the extension 2131, the connection area with the voice coil 22 is increased by the extension 2131, thereby improving the connection strength and stability.

[0136] In order to further improve the driving force of the voice coil 22 and improve the performance of the sound generating device 100. In an embodiment, the vibration plate 213 has a magnetic conductive property. In this way, when the voice coil 22 vibrates, the vibration plate 213 can be attracted by the first magnetic group 331 and the second magnetic group 332 of the center magnetic section 33, thereby increasing the driving force of the voice coil 22, and thus improving the performance of the sound generating device 100.

[0137] It can be understood that the vibration plate 213 having a magnetic conductive property can be made of a magnetic conductive material or made of a material containing a magnetic conductive material. Of course, a magnetic conductive layer 2132 and a magnetic conductive piece 2133 and the like can also be provided on the vibration plate 213, which is not limited herein.

[0138] In an embodiment, as shown in Figure 15 and Figure 16 As 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 second magnet 3312 and / or the third magnet 3321 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] In this embodiment, if Figure 11As shown, by setting the skeleton structure as the one-piece support 24, and setting the support 24 at the inner side of the voice coil 22, and extending along the first direction and protruding from the two ends of the voice coil 22 along the first direction, the first diaphragm 211 and the second diaphragm 212 can be conveniently connected with the two ends of the support 24 along the first direction respectively, thereby saving the assembly process. It can be understood that the outer periphery of the vibration plate 213 is connected with the support 24, so that not only the vibration plate 213 and the support 24 cooperate on the two sides of the vibration plate 213 away from each other for accommodating the space of the first magnetic group 331 and the second magnetic group 332, but also the sealing performance can be improved.

[0145] It can be understood that the support 24 and the vibration plate 213 are provided in a split manner, and alternatively, the support 24 and the vibration plate 213 are bonded or welded, which is not limited herein.

[0146] In order to further improve the connection stability of the support 24 and the first diaphragm 211 and the second diaphragm 212, in an embodiment, the two ends of the support 24 along the first direction are respectively bent and extended to form the edge portion 241, and the edge portion 241 is connected with the first diaphragm 211 or the second diaphragm 212.

[0147] It can be understood that, as shown, Figure 11 at least one end of the support 24 is bent and extended to form the edge portion 241 towards the first diaphragm 211 or the second diaphragm 212, so that the side portion of the first diaphragm 211 or the second diaphragm 212 is supported and connected to the edge portion 241, thereby increasing the connection area and improving the connection stability.

[0148] In an embodiment, the vibration system 2 further comprises a first skeleton 231 and a second skeleton 232, the two ends of the first skeleton 231 along the first direction are respectively connected with 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 with the second diaphragm 212 and the other end of the voice coil 22.

[0149] In the present embodiment, as shown, Figures 3 to 10 by setting the skeleton structure as a split structure, the skeleton structure comprises the first skeleton 231 and the second skeleton 232, 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 with 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 with 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 conducive to reducing the width of the magnetic gap 35, and the first diaphragm 211 and the second diaphragm 212 are supported away by the first skeleton 231 and the second skeleton 232, so that the first diaphragm 211 and the second diaphragm 212 are spaced apart along the first direction and form a space for mounting the magnetic portion 34.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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 .

[0156] It is understandable that the first diaphragm 211 and the second diaphragm 212 are connected to a housing or shell structure via the external connection portion 2113. In one embodiment, the sound generating device 100 further includes a housing 1, and the two external connection portions 2113 are respectively connected to the two ends of the housing 1 along the first direction.

[0157] 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.

[0158] Of course, the first diaphragm 211 and the second diaphragm 212 can also be configured as vertical diaphragms. Figure 10 and Figure 14 As shown, the first diaphragm 211 and the second diaphragm 212 both include a deformation portion 2116 and a first end 2114 and a second end 2115 arranged at both ends of the deformation portion 2116 along the first direction. The two first ends 2114 are respectively connected to the end of the first skeleton 231 and the second skeleton 232 away from the voice coil 22, and at least parts of the two second ends 2115 are respectively connected to the edge magnetic portion 34.

[0159] In this embodiment, if Figure 10 and Figure 14 As shown, the first end 2114 and the second end 2115 are provided at both ends of the deformation portion 2116 along the first direction. The first end 2114 is connected to the first frame 231 / the second frame 232 or the bracket 24 , and the second end 2115 is connected to the edge magnetic portion 34 .

[0160] It is understood that the deformable portion 2116 is capable of deforming and extending along the first direction. The deformable portion 2116 is provided with at least one bend along the first direction, with the opening of the bend facing a direction perpendicular to the first direction. Optionally, the deformable portion 2116 is provided with multiple bends along the first direction, and the multiple bends are arranged and connected along the first direction, which is not limited here.

[0161] In this embodiment, if Figure 3 As shown, the voice coil 22 includes two long sides 221 and two short sides 222 connected end to end, and includes two side magnets 34 symmetrically arranged on opposite sides of the voice coil 22 and extending along the extension direction of the long sides 221 respectively.

[0162] It can be understood that the side magnetic parts 34 of the magnetic circuit system 3 are only provided on two opposite sides of the voice coil 22 . The two side magnetic parts 34 are respectively opposite to the two long sides 221 and extend along the extension direction of the long sides 221 .

[0163] In order to ensure the sealing of the first cavity 314 and the second cavity 324, in one embodiment, as shown in FIG. Figure 3As shown, the sound-generating device 100 also includes a shell 1, and a support portion is protruded from each short side 222 of the shell 1. The two ends of each support portion extend toward the two edge magnetic portions 34 and are connected to the two edge magnetic portions 34. Each second end 2115 is connected to the two edge magnetic portions 34 and the two support portions.

[0164] As can be understood, the second ends 2115 of the first diaphragm 211 and the second diaphragm 212 are respectively connected to the two edge magnetic portions 34 and the two supporting portions, so that the housing 1, the edge magnetic portions 34, the first diaphragm 211, the first skeleton 231 or the bracket 24, the voice coil 22, the second skeleton 232 or the bracket 24, and the second diaphragm 212 enclose and form the third cavity 13. The second ends 2115 are respectively connected to the two edge magnetic portions 34 and the two supporting portions, thereby isolating the first cavity 314 / the second cavity 324 from the third cavity 13.

[0165] In this embodiment, the housing 1 includes a first shell 11 and a second shell 12 arranged along a first direction, the first shell 11 is opposite to and spaced from the deformation portion 2116 of the first diaphragm 211, and the first shell 11 is provided with a first support portion corresponding to each short side 222, and the two ends of each first support portion extend toward the two edge magnetic portions 34 and are connected to the two edge magnetic portions 34, the second end 2115 of the first diaphragm 211 is connected to the two edge magnetic portions 34 and the two first support portions, the second shell 12 is opposite to and spaced from the deformation portion 2116 of the second diaphragm 212, and the second shell 12 is provided with a second support portion corresponding to each short side 222, and the two ends of each second support portion extend toward the two edge magnetic portions 34 and are connected to the two edge magnetic portions 34, and the second end 2115 of the second diaphragm 212 is connected to the two edge magnetic portions 34 and the two second support portions, which is not limited here.

[0166] 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.

[0167] 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 3 and Figure 4 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.

[0168] 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 .

[0169] 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 .

[0170] 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.

[0171] In one embodiment, the side magnet portion 34 includes two side magnets 341 stacked along a first direction and a side magnetic conductive plate 342 disposed between the two side magnets 341. The two side magnets 341 are magnetized in opposite directions along the first direction. The polarity of the magnetic poles at the ends of the two side magnets 341 facing away from each other is opposite to the polarity of the magnetic poles at the ends of the second magnet 3312 and the third magnet 3321 facing away from each other. The polarity of the magnetic poles at the ends of the second magnet 3312 and the third magnet 3321 facing away from each other is the same as the polarity of the magnetic poles at the ends of the first magnet 3311 and the fourth magnet 3322 facing the voice coil 22.

[0172] In this embodiment, if Figure 1 、 Figures 3 to 5As shown, by setting the edge magnetic portion 34 as two edge magnets 341 stacked along the first direction and a side magnetic conductive plate 342 arranged between the two edge magnets 341, the two edge magnets 341 form a magnetic circuit with the first magnetic group 331 and the second magnetic group 332 respectively, and the side magnetic conductive plate 342 between the two edge magnets 341 is used to gather and guide the magnetic flux lines of the two magnetic circuits to pass 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 then improving the performance, thereby improving the acoustic performance of the sound-generating device 100.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] In one embodiment, a projection of the edge magnetic conductive plate 342 along a direction perpendicular to the first direction is located between the surfaces of the second magnet 3312 and the third magnet 3321 facing the diaphragm assembly 21 .

[0178] In this embodiment, if Figure 4 、 Figure 5 and Figure 8 As shown, by arranging the projection of the edge magnetic plate 342 of the edge magnetic portion 34 along a direction perpendicular to the first direction between the surfaces of the second magnet 3312 and the third magnet 3321 facing the diaphragm assembly 21, it is ensured that the edge magnetic portion 34 can form a magnetic circuit with the second magnet 3312 and the third magnet 3321 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.

[0179] In another embodiment, the edge magnetic portion 34 includes an edge magnet 341 arranged between the first diaphragm 211 and the second diaphragm 212, and the sound-emitting device 100 forms a third cavity 13 located between the first diaphragm 211 and the second diaphragm 212, and the edge magnet 341 is exposed in the third cavity 13 on both sides facing the first diaphragm 211 and the second diaphragm 212.

[0180] In this embodiment, if Figure 6 As shown, by providing a single edge magnet 341 as the edge magnet portion 34, i.e., a single edge magnet 341 along the first direction, the edge magnet 341 forms a magnetic circuit with the first magnetic group 331 and the second magnetic group 332, respectively. This concentrates and guides the magnetic flux lines 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 the acoustic performance of the sound-generating device 100. At the same time, the edge washers of the edge magnet portion 34 are eliminated, thereby reducing the thickness of the sound-generating device 100 in the Z direction.

[0181] Optionally, the side magnet 341 is magnetized in a direction perpendicular to the first direction, and the magnetic pole polarity of the side magnet 341 facing the voice coil 22 is the same as the magnetic pole polarity of the end of the second magnet 3312 and the third magnet 3321 away from each other, and the magnetic pole polarity of the end of the second magnet 3312 and the third magnet 3321 away from each other is the same as the magnetic pole polarity of the first magnet 3311 and the fourth magnet 3322 facing the voice coil 22.

[0182] In this embodiment, the side magnet 341 is magnetized in the horizontal direction, that is, the magnetization direction of the side magnet 341 is perpendicular to the magnetization direction of the second magnet 3312 and the third magnet 3321, and the magnetization direction of the side magnet 341 is opposite to the magnetization direction of the first magnet 3311 and the fourth magnet 3322.

[0183] 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.

[0184] In this embodiment, the thickness of the side magnet 341 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. Optionally, the thickness of the side magnet 341 along the first direction is less than the thickness of the second magnet 3312 / third magnet 3321 along the first direction, but not less than 1 / 5 of the thickness of the second magnet 3312 / third magnet 3321 along the first direction. This arrangement ensures that the side magnet 341 forms a magnetic circuit with the first magnetic group 331 and the second magnetic group 332, and guides the magnetic flux lines 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. This is not limited here.

[0185] In another embodiment, the edge magnetic portion 34 includes an edge magnetic conductive plate 342 disposed between the first diaphragm 211 and the second diaphragm 212, and the sound-generating device 100 forms a third cavity 13 located between the first diaphragm 211 and the second diaphragm 212, and the edge magnetic conductive plate 342 is exposed in the third cavity 13 on both sides facing the first diaphragm 211 and the second diaphragm 212.

[0186] In this embodiment, if Figure 7 As shown, by providing the edge magnetic portion 34 with a single edge magnetic conductive plate 342, that is, only one edge magnetic conductive plate 342 along the first direction, the edge magnetic conductive plate 342 is used to gather and guide the magnetic flux lines forming the magnetic circuit of the first magnetic group 331 and the second magnetic group 332 through the voice coil 22 located 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 the performance and acoustic performance of the sound-generating device 100. At the same time, the thickness of the sound-generating device 100 in the Z direction is reduced.

[0187] Optionally, the thickness of the side magnetic conductive plate 342 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 / 10 of the extension length of the voice coil 22 along the first direction. Optionally, the thickness of the side magnetic conductive plate 342 along the first direction is less than the thickness of the second magnet 3312 / third magnet 3321 along the first direction, and is not less than 1 / 10 of the thickness of the second magnet 3312 / third magnet 3321 along the first direction.

[0188] In yet another embodiment, the edge magnet portion 34 forms 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 edge magnet portion 34 as a Halbach magnetic circuit, the Halbach magnetic circuit further enhances the magnetic field strength of the magnetic circuit formed with the first magnetic group 331 and the second magnetic group 332. 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.

[0189] In one embodiment, the side magnet portion 34 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 and in opposite directions. The second side magnet 344 is magnetized in a direction perpendicular to the first direction, so that the first side magnet 343, the second side magnet 344, and the third side magnet 345 form a Halbach magnetic circuit.

[0190] 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, and the polarity of the magnetic pole of the second side magnet 344 facing the voice coil 22 is opposite to the polarity of the magnetic pole at the end away from each other of the first side magnet 343 and the third side magnet 345.

[0191] It can be understood that the magnetic pole polarity of the first side magnet 343 and the third side magnet 345 facing the second side magnet 344 is the same as the magnetic pole polarity of the end of the second magnet 3312 and the third magnet 3321 away from each other, the magnetic pole polarity of the second side magnet 344 facing the voice coil 22 is the same as the magnetic pole polarity of the end of the second magnet 3312 and the third magnet 3321 away from each other, and the magnetic pole polarity of the end of the second magnet 3312 and the third magnet 3321 away from each other is the same as the magnetic pole polarity of the side of the first magnet 3311 and the fourth magnet 3322 facing the voice coil 22.

[0192] It can be understood that the first side magnet 343 and the first magnetic group 331 form a magnetic circuit, and the third side magnet 345 and the second magnetic group 332 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.

[0193] 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, a first magnetic group 331 is arranged on the first magnetic yoke 31, and a first magnet 3311 is clamped between the first magnetic yoke 31 and the second magnet 3312, a second magnetic group 332 is arranged on the second magnetic yoke 32, and a fourth magnet 3322 is clamped between the second magnetic yoke 32 and the third magnet 3321; wherein, a first cavity 314 is formed between the first diaphragm 211, the voice coil 22 and 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 and 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.

[0194] In this embodiment, if Figure 1 、 Figure 3 and Figure 4 As 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 group 331 and the second magnetic group 332 can be installed and fixed by using the first magnetic yoke 31 and the second magnetic group 332 respectively, and at the same time, the magnetic lines of force of the first magnetic group 331 and the second magnetic group 332 are gathered to form a magnetic circuit.

[0195] It is understood that the side of the first magnet 3311 facing away from the second magnet 3312 is connected to the first magnetic yoke 31, and the side of the fourth magnet 3322 facing away from the third magnet 3321 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 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 fourth magnet 3322 along the first direction. This not only ensures the installation and fixation of the first magnetic group 331 and the second magnetic group 332, but also achieves a magnetic focusing effect.

[0196] 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 magnetic group 331 is located in the first cavity 314, and the second magnetic group 332 is located in the second cavity 324. It can be understood that the first magnetic yoke 31 is provided with a first sound outlet hole 313 connected to the first cavity 314, and the second magnetic yoke 32 is provided with a second sound outlet hole 323 connected to the second cavity 324, thereby achieving double-sided sound emission of the sound-emitting device 100.

[0197] 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.

[0198] In one embodiment, the first magnetic yoke 31 is provided with a first recessed groove corresponding to the first magnet 3311, and the first magnet 3311 is disposed within the first recessed groove. As will be appreciated, this arrangement allows the first magnet 3311 to be positioned and installed using the first recessed groove, improving installation stability. Furthermore, the assembly height between the first magnetic assembly 331 and the first magnetic yoke 31 can be reduced, thereby increasing the vibration space of the vibration plate 213.

[0199] 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 magnet 3311, in which case the first magnetic yoke 31 is flat and faces away from the first magnet 3311; or, the first recessed groove may be formed by bending the first magnetic yoke 31 toward the side away from the first magnet 3311, in which case the side of the first magnetic yoke 31 facing away from the first magnet 3311 is raised at the position corresponding to the first recessed groove, which is not limited here.

[0200] In one embodiment, the second magnetic yoke 32 is provided with a second recessed groove corresponding to the fourth magnet 3322, and the fourth magnet 3322 is disposed within the second recessed groove. As will be appreciated, this arrangement allows the fourth magnet 3322 to be positioned and installed using the second recessed groove, improving installation stability. Furthermore, the assembly height between the second magnetic assembly 332 and the second magnetic yoke 32 can be reduced, thereby increasing the vibration space of the vibration plate 213.

[0201] In this embodiment, the second recessed groove may be formed by a recess on the side of the second magnetic yoke 32 facing the fourth magnet 3322, in which case the second magnetic yoke 32 is flat with its back to the fourth magnet 3322; or, the second recessed groove may be formed by bending the second magnetic yoke 32 toward the side away from the fourth magnet 3322, in which case the side of the second magnetic yoke 32 facing away from the fourth magnet 3322 is raised at a position corresponding to the second recessed groove, which is not limited here.

[0202] 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 portion 34 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.

[0203] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4 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.

[0204] 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.

[0205] 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 .

[0206] It is understood that the housing 1 can be a frame structure or frame with both ends open, in which case the first yoke 31 is connected to one end of the housing 1, and the second yoke 32 is located at the end of the housing 1 away from the first yoke 31. Optionally, the housing 1 is made of metal or plastic.

[0207] 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.

[0208] 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 edge magnetic portion 34 and the first magnetic yoke 31, and the two ends of the second shell 12 are respectively connected to the edge magnetic portion 34 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.

[0209] 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.

[0210] 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.

[0211] 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 .

[0212] 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 magnetic group 331 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 magnetic group 332 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.

[0213] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4 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.

[0214] In this embodiment, if Figure 1 、 Figure 3 、 Figure 4As 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.

[0215] 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 .

[0216] As will be understood, 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 a mounting space for the second magnet 3312. 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.

[0217] 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.

[0218] 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 As shown, multiple first sound holes 313 are spaced apart and arranged around the first magnetic group 331. Optionally, the multiple first sound holes 313 are all opposite the folding ring portion 2112 of the first diaphragm 211. This arrangement can facilitate smooth and rapid flow of sound waves in the first cavity 314, thereby improving the sound effect.

[0219] 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.

[0220] 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 .

[0221] 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 to provide a mounting space for the third magnet 3321. 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.

[0222] 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.

[0223] 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 As shown, multiple second sound holes 323 are spaced apart and arranged around the second magnetic group 332. Optionally, the multiple second sound holes 323 are all opposite the folding ring portion 2112 of the second diaphragm 212. This arrangement can facilitate smooth and rapid flow of sound waves in the second cavity 324, thereby improving the sound effect.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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 .

[0231] 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.

[0232] In one embodiment, the voice coil 22 includes two long sides 221 and two short sides 222 connected end to end, and the side magnet portions 34 include two side magnet portions 34. The two side magnet portions 34 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 magnet portions 34 extend respectively along the extension direction of the long sides 221.

[0233] 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.

[0234] 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 .

[0235] 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.

[0236] 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.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] It can be understood that the smart glasses can be AR / VR / MR glasses, etc., which are not limited herein. In the embodiment, the sound generating device 100 is arranged in the mounting cavity of the glasses leg, so that the sound generating device 100 divides the mounting cavity of the glasses leg into two front cavities and one rear cavity. In order to facilitate sound emission and air release, the glasses leg is further provided with a first sound emission opening and a second sound emission opening respectively communicating with the two front cavities, and an air release opening communicating with the rear cavity.

[0245] Optionally, the first sound emission opening and the second sound emission opening are located on two surfaces of the glasses leg opposite in the first direction, and one of the two surfaces faces the ear of the user.

[0246] In the embodiment, the height of the glasses leg is the height of the glasses leg in the first direction, the thickness of the glasses leg is the thickness of the glasses leg in the second direction, the height of the glasses leg corresponds to the height of the sound generating device 100 in the first direction, and the thickness of the glasses leg corresponds to the width of the sound generating device 100. It can be understood that by locating the first sound emission opening and the second sound emission opening on two surfaces of the glasses leg opposite in the first direction, the space occupied in the thickness direction of the glasses leg is less, so that the overall product can be thinner, and the comfort of the user when wearing the smart glasses is improved.

[0247] It should be noted that the first sound emission hole 313 and the second sound emission hole 323 of the sound generating device 100 respectively communicate with the two front cavities, and the air release hole 14 of the sound generating device 100 communicates with the rear cavity. In this way, the smart glasses can emit sound through the first sound emission opening and the second sound emission opening, and release air through the air release opening. In addition, the sound waves radiated outward by the first sound emission opening and the second sound emission opening are used, so that from a fixed position far away from the environment, the distance of the fixed position from the two sound waves is approximately equivalent due to the close positions of the two sound waves, so that the two sound waves generate two equal and opposite sound fields. Therefore, the fixed position receives two equal and opposite phase sound waves, and according to the superposition effect of the dipole, the sound waves at the fixed position can be maximally cancelled, greatly improving the sound leakage problem of the smart glasses during use, protecting the privacy of the user, and improving the user experience.

[0248] The above description is only an optional embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made according to the content of the specification and drawings of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

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, the side magnetic portion being disposed between the first diaphragm and the second diaphragm and located outside the voice coil, the central magnetic portion comprising a first magnetic group and a second magnetic group disposed opposite and spaced apart along the first direction, the first magnetic group and the second magnetic group being located on opposite sides of the diaphragm along the first direction, the side magnetic portion and the central magnetic portion cooperating to form a magnetic gap for accommodating the voice coil; The first magnetic group includes a first magnet and a second magnet stacked along the first direction, the second magnetic group includes a third magnet and a fourth magnet stacked along the first direction, the second magnet and the third magnet forming surfaces of the first magnetic group and the second magnetic group respectively on the side facing the vibration plate, the second magnet and the third magnet are magnetized along the first direction and in opposite directions, the magnetization directions of the first magnet and the fourth magnet are perpendicular to the magnetization directions of the second magnet and the third magnet, and the polarity of the magnetic poles on the side of the first magnet and the fourth magnet facing the voice coil is the same as the polarity of the magnetic poles on the side of the second magnet and the third magnet facing away from the vibration plate; The sound-generating device is formed with a first cavity and a second cavity located on both sides of the vibration plate along the first direction, and is further provided with a first sound outlet hole and a second sound outlet hole respectively communicating with the first cavity and the second cavity.

2. The sound-generating device according to claim 1, wherein: The second magnet is rectangular, having a first long axis and a first short axis connected end to end; wherein the first magnet comprises two, the two first magnets being arranged flatly on a side of the second magnet facing away from the vibration plate, adjacent to and parallel to each other along the direction of the first long axis, and having opposite magnetization directions of the two first magnets; And / or, the third magnet is rectangular, and has a second long axis side and a second short axis side connected end to end; wherein, the fourth magnet includes two, the two fourth magnets are flatly arranged on the side of the third magnet facing away from the vibration plate, and are adjacent and arranged in parallel along the direction of the second long axis, and the magnetization directions of the two fourth magnets are opposite.

3. The sound-generating device according to claim 1, wherein: Projections of the first magnetic group and the second magnetic group along the first direction are located inside the voice coil; And / or, the thickness of the edge magnet portion along the first direction is greater than the extension length of the voice coil along the first direction, and is not greater than 3 times the extension length of the voice coil along the first direction; And / or, the thickness of the second magnet along the first direction is not less than 1 / 5 of the thickness of the first magnet along the first direction; And / or, the thickness of the third magnet along the first direction is not less than 1 / 5 of the thickness of the fourth magnet along the first direction; And / or, the first diaphragm and the second diaphragm are symmetrically arranged relative to the vibration plate; And / or, the first magnetic group and the second magnetic group are symmetrically arranged relative to the vibration plate; 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 also includes a first skeleton and a second skeleton, wherein the two ends of the first skeleton along the first direction are respectively connected to the first diaphragm and one end of the voice coil, and the two ends of the second skeleton along the first direction are respectively connected to the second diaphragm and the other end of the voice coil.

5. The sound-generating device according to claim 4, wherein: 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.

6. The sound-generating device according to claim 5, 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 parts are respectively connected to two ends of the housing along the first direction; 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.

7. The sound-generating device according to claim 1, wherein: The edge magnet portion includes two edge magnets stacked along the first direction and an edge magnetic conductive plate disposed between the two edge magnets; The two side magnets are magnetized along the first direction and in opposite directions, and the polarity of the magnetic poles at the ends of the two side magnets away from each other is opposite to the polarity of the magnetic poles at the ends of the second magnet and the third magnet away from each other.

8. The sound-generating device according to claim 1, wherein: The edge magnet portion includes a first edge magnet, a second edge magnet, and a third edge magnet stacked along the first direction, the first edge magnet and the third edge magnet are magnetized along the first direction and in opposite directions, and the second edge magnet is magnetized in a direction perpendicular to the first direction; The magnetic pole polarity of the first side magnet and the third side magnet facing the second side magnet is the same as the magnetic pole polarity of the end of the second magnet and the third magnet away from each other, the magnetic pole polarity of the second side magnet facing the voice coil is the same as the magnetic pole polarity of the end of the second magnet and the third magnet away from each other, and the magnetic pole polarity of the end of the second magnet and the third magnet away from each other is the same as the magnetic pole polarity of the side of the first magnet and the fourth magnet facing the voice coil.

9. 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 first magnetic group is disposed on the first magnetic yoke, and the first magnet is sandwiched between the first magnetic yoke and the second magnet, the second magnetic group is disposed on the second magnetic yoke, and the fourth magnet is sandwiched between the second magnetic yoke and the third magnet; 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.

10. The sound-generating device according to claim 9, 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 portion 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 a third cavity, and the sound-generating device is provided with an air vent connected to the third cavity.

11. The sound generating device according to claim 10, wherein: The housing includes a first shell and a second shell arranged along the first direction, two ends of the first shell are respectively connected to the edge magnet portion and the first magnetic yoke, and two ends of the second shell are respectively connected to the edge magnet portion and the second magnetic yoke; Wherein, the air leakage hole is provided in the first shell or the second shell or between the first shell and the second shell.

12. The sound generating device according to claim 10, wherein: The first magnetic yoke includes a first top plate portion and a first side plate portion arranged at an angle, the first magnetic group is arranged 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 magnetic group is arranged 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.

13. An electronic device, characterized in that: The electronic device comprises a sound-generating device according to any one of claims 1 to 12; 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.

14. The electronic device according to claim 13, 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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