Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, and a part of a first central magnetic part and a part of a second central magnetic part of a magnet assembly in the sound production device are embedded in a central mounting hole of a supporting plate and are connected with each other; part of the first edge magnetic part and part of the second edge magnetic part are embedded in the edge mounting hole of the supporting plate and are connected with each other, the first edge magnetic part and the first center magnetic part are arranged at an interval to form a first magnetic gap, and the second edge magnetic part and the second center magnetic part are arranged at an interval to form a second magnetic gap. A first voice coil of the first vibration system is arranged corresponding to the first magnetic gap, and a second voice coil of the second vibration system is arranged corresponding to the second magnetic gap; the first central magnetic part and the second central magnetic part are bonded and connected; and / or the first edge magnetic part and the second edge magnetic part are bonded and connected. According to the sound production device, the thin and light design can be realized, the light and thin design requirement of a terminal product is met, the distortion is relatively low, and the sound production effect of the sound production device is improved.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic transduction technology, and in particular to a sound-generating device and an electronic device using the sound-generating device. Background Technology

[0002] In recent years, with the rapid development of consumer electronics, miniature speakers, as a common electroacoustic transducer, have been widely used in mobile phones, glasses, headphones, tablets and other fields. These portable terminal products have gradually formed a trend of multi-functionality, miniaturization and high performance.

[0003] As people increasingly demand more advanced functionality in electronic products and pursue aesthetically pleasing, slim, and lightweight designs, the overall space of these devices is becoming increasingly limited, while the performance requirements for speakers are rising. In related technologies, the molding process for the magnetic circuit system within speakers typically employs sintering, which prevents the achievement of ultra-thin designs and weight reduction. Furthermore, speakers used in smart glasses are generally placed inside the temples of the glasses, which have a flat and slender structure. Since smart glasses are usually equipped with a single-core speaker, the speaker's performance is insufficient to meet the listening requirements of smart glasses. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and an electronic device, which aims to provide a sound-generating device that effectively improves acoustic performance. This sound-generating device can achieve a thin and light design to meet the usage requirements of end products, and can also increase the magnet volume of the magnetic circuit system to improve the sound-generating performance of the sound-generating device.

[0005] To achieve the above objectives, the present invention proposes a sound-generating device, comprising: a housing; and a magnetic circuit system disposed within the housing. The magnetic circuit system includes a support plate and a magnet assembly. The support plate has a central mounting hole and side mounting holes spaced apart. The magnet assembly includes a central magnetic portion and side magnetic portions disposed outside the central magnetic portion. The central magnetic portion includes a first central magnetic portion and a second central magnetic portion stacked along a first direction. A portion of the first central magnetic portion and a portion of the second central magnetic portion are embedded in the central mounting hole and connected to each other. The side magnetic portions include a first side magnetic portion and a second side magnetic portion stacked along the first direction. A portion of the first side magnetic portion and a portion of the second side magnetic portion are embedded in the side mounting holes and connected to each other. The first side magnetic portion and the first central magnetic portion are spaced apart to form a first magnetic gap. The second side magnetic portion and the second central magnetic portion are spaced apart to form a second magnetic gap; a first vibration system is disposed on the housing and located on one side of the magnetic circuit system, the first vibration system includes a first diaphragm assembly and a first voice coil connected to the first diaphragm assembly, the first voice coil being correspondingly disposed with respect to the first magnetic gap; and a second vibration system is disposed on the housing and located on the other side of the magnetic circuit system, the second vibration system includes a second diaphragm assembly and a second voice coil connected to the second diaphragm assembly, the second voice coil being correspondingly disposed with respect to the second magnetic gap, both the first vibration system and the second vibration system vibrate along the first direction; wherein, the first central magnetic portion and the second central magnetic portion are bonded together; and / or, the first side magnetic portion and the second side magnetic portion are bonded together.

[0006] The sound-generating device of this invention houses the magnetic circuit system, the first vibration system, and the second vibration system within a housing. This allows the housing to mount, fix, and protect these components. Furthermore, the first and second vibration systems are positioned on opposite sides of the magnetic circuit system, and both vibrate along a first direction. This creates a dual-vibration system structure, allowing the first and second vibration systems to share a single magnetic circuit system. When the first and second vibration systems radiate sound waves of the same phase, the sound-generating device... This design enables bi-directional radiation and doubled loudness, significantly improving the performance and overall loudness of the sound-generating device. When the first and second vibration systems radiate sound waves of opposite phase, they generate two equal-sized, opposite-phase sound fields. Therefore, two equal-sized, opposite-phase sound waves are received at the far-field position. Due to the dipole superposition effect, these far-field sound waves can cancel each other out to the greatest extent, greatly improving sound leakage during use, protecting user privacy, and enhancing the user experience. Simultaneously, by setting the magnetic circuit system as a support plate and magnet assembly, and supporting... The plate has central mounting holes and edge mounting holes spaced apart. The central magnetic portion of the magnet assembly is configured as a first central magnetic portion and a second central magnetic portion stacked along a first direction. The edge magnetic portions are configured as first edge magnetic portions and second edge magnetic portions stacked along the first direction. A portion of the first central magnetic portion and a portion of the second central magnetic portion are embedded in the central mounting holes and connected to each other. A portion of the first edge magnetic portion and a portion of the second edge magnetic portion are embedded in the edge mounting holes and connected to each other. This creates a first magnetic gap between the first edge magnetic portion and the first central magnetic portion, and a second magnetic gap between the second edge magnetic portion and the second central magnetic portion. By aligning the first voice coil of the first vibration system with the first magnetic gap, and the second voice coil of the second vibration system with the second magnetic gap, the first and second vibration systems can share a single magnetic circuit system. Furthermore, the central and side mounting holes of the support plate effectively increase the magnet volume of the central and side magnetic parts, enabling an ultra-thin and lightweight design for the sound-generating device, meeting the needs of end products. Moreover, with the same thickness requirement, this arrangement increases the magnet volume of the central and side magnetic parts, thereby improving the product's black-white (BL) value and enhancing the sound-generating effect of the device. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0008] Figure 1 A schematic diagram of the structure of an embodiment of the sound-generating device provided by the present invention; Figure 2 A schematic diagram of the structure of an embodiment of the sound-generating device provided by the present invention from another perspective; Figure 3 An exploded view of an embodiment of the sound-generating device provided by the present invention; Figure 4 A cross-sectional schematic diagram of an embodiment of the sound-generating device provided by the present invention; Figure 5 An exploded view of another embodiment of the sound-generating device provided by the present invention; Figure 6 A cross-sectional schematic diagram of another embodiment of the sound-generating device provided by the present invention; Figure 7 This is a cross-sectional schematic diagram of an embodiment of the magnetic circuit system provided by the present invention; Figure 8 This is a cross-sectional schematic diagram of another embodiment of the magnetic circuit system provided by the present invention; Figure 9 A cross-sectional schematic diagram of the magnetic circuit system, the first auxiliary magnet assembly, and the second auxiliary magnet assembly in one embodiment of the sound-generating device provided by the present invention; Figure 10 A schematic diagram of a structure of a support plate according to an embodiment of the present invention; Figure 11 This is a cross-sectional schematic diagram of an embodiment of the first vibration system and the second vibration system provided by the present invention.

[0009] Explanation of icon numbers: 100. Sound-generating device; 1. Outer shell; 11. First housing; 111. First sound outlet; 12. Second housing; 121. Second sound outlet; 13. Middle housing; 131. First middle housing; 132. Second middle housing; 133. Third sound outlet; 134. Fourth sound outlet; 14. First clearance portion; 151. First cavity; 152. Second cavity; 153. Third cavity; 154. Fourth cavity; 161. First clearance gap; 162. Second clearance gap; 2. Magnetic circuit system; 21. Support plate; 211. Center mounting hole; 212. Side mounting hole; 22. Magnet assembly; 221 2211. Central magnetic section; 2212. First central magnetic guide plate; 2213. Second central magnetic guide plate; 2214. First central magnetic section; 2215. Second central magnetic section; 2216. First groove; 2217. First central magnet; 2218. Second central magnet; 222. Side magnetic section; 2222. First side magnetic guide plate; 2223. Second side magnetic guide plate; 2224. First side magnetic section; 2225. Second side magnetic section; 2226. Second groove; 2227. First side magnet; 2228. Second side magnet; 223. First magnetic gap; 224. Second magnetic gap; 3. First vibration system; 3 1. First diaphragm assembly; 311. First diaphragm; 3111. First surround; 312. First diaphragm plate; 3121. First inner diaphragm plate; 3122. First outer diaphragm plate; 32. First voice coil; 321. First voice coil; 322. Second voice coil; 33. First centering support; 331. First outer fixing part; 332. First inner fixing part; 333. First spring arm part; 34. Second clearance part; 4. Second vibration system; 41. Second diaphragm assembly; 411. Second diaphragm; 4111. Second surround; 412. Second diaphragm plate; 4121. Second inner diaphragm plate; 4122. 42. Second outer diaphragm; 421. Second voice coil; 422. Third voice coil; 422. Fourth voice coil; 43. Second centering support; 431. Second outer fixing part; 432. Second inner fixing part; 433. Second spring arm part; 44. Third clearance part; 5. First auxiliary magnet assembly; 51. First auxiliary center magnet; 52. First auxiliary side magnet; 53. First auxiliary magnetic gap; 54. First magnetic field line dense area; 6. Second auxiliary magnet assembly; 61. Second auxiliary center magnet; 62. Second auxiliary side magnet; 63. Second auxiliary magnetic gap; 64. Second magnetic field line dense area; 7. Connector.

[0010] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0012] This invention proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices, which may include mobile phones, headphones, smart glasses, and other smart wearable devices, etc., and are not limited thereto.

[0013] Please refer to the reference. Figures 1 to 11 As shown, in this embodiment of the invention, the sound-generating device 100 includes a housing 1, a magnetic circuit system 2, a first vibration system 3, and a second vibration system 4. The magnetic circuit system 2 is disposed on the housing 1 and includes a support plate 21 and a magnet assembly 22. The support plate 21 has a central mounting hole 211 and a side mounting hole 212 arranged at intervals. The magnet assembly 22 includes a central magnetic part 221 and a side magnetic part 222 disposed outside the central magnetic part 221. The central magnetic part 221 includes a first central magnetic part 2214 and a second central magnetic part 2215 stacked along a first direction. Parts of the first central magnetic part 2214 and part of the second central magnetic part 2215 are embedded in the central mounting hole 211 and connected to each other. The side magnetic part 222 includes a first side magnetic part 2224 and a second side magnetic part 2225 stacked along a first direction. Parts of the first side magnetic part 2224 and part of the second side magnetic part 2225 are embedded in the side mounting hole 212 and connected to each other. A first magnetic gap 223 is formed by the first central magnetic part 2214 and the second side magnetic part 2225 and the second central magnetic part 2215 being spaced apart. A second magnetic gap 224 is formed by the second side magnetic part 2225 and the second central magnetic part 2215 being spaced apart. A first vibration system 3 is disposed on the outer shell 1 and located on one side of the magnetic circuit system 2. The first vibration system 3 includes a first diaphragm assembly 31 and a first voice coil 32 connected to the first diaphragm assembly 31. The first voice coil 32 is correspondingly disposed with the first magnetic gap 223. A second vibration system 4 is disposed on the outer shell 1 and located on the other side of the magnetic circuit system 2. The second vibration system 4 includes a second diaphragm assembly 41 and a second voice coil 42 connected to the second diaphragm assembly 41. The second voice coil 42 is correspondingly disposed with the second magnetic gap 224. Both the first vibration system 3 and the second vibration system 4 vibrate along a first direction. The first central magnetic part 2214 and the second central magnetic part 2215 are bonded together. And / or, the first side magnetic part 2224 and the second side magnetic part 2225 are bonded together.

[0014] In this embodiment, the sound-generating device 100 can be a single unit of a loudspeaker, and the loudspeaker can be a miniature loudspeaker. It is understood that the magnetic circuit system 2, the first vibration system 3, and the second vibration system 4 of the sound-generating device 100 are housed in the housing 1, so that the housing 1 is used to install, fix, and support the magnetic circuit system 2, the first vibration system 3, and the second vibration system 4.

[0015] Understandably, the outer casing 1 has a cavity, and the magnetic circuit system 2, the first vibration system 3, and the second vibration system 4 are all disposed within the cavity of the outer casing 1. The first vibration system 3 and the second vibration system 4 are respectively disposed on opposite sides of the magnetic circuit system 2 along the first direction. In this embodiment, the magnetic circuit system 2 has a first side and a second side that are opposite to each other along the first direction. The first vibration system 3 is located on the first side of the magnetic circuit system 2 and is disposed opposite to the magnetic circuit system 2. The second vibration system 4 is located on the second side of the magnetic circuit system 2 and is disposed opposite to the magnetic circuit system 2.

[0016] Optionally, the outer casing 1 can be a split structure, which facilitates the installation of structures such as the magnetic circuit system 2, the first vibration system 3, and the second vibration system 4. In this embodiment, as... Figures 1 to 6 As shown, the outer shell 1 includes a first shell 11, a second shell 12, and a middle shell 13 located between the first shell 11 and the second shell 12. Thus, the periphery of the first diaphragm assembly 31 is sandwiched between the first shell 11 and the middle shell 13, the periphery of the second diaphragm assembly 41 is sandwiched between the second shell 12 and the middle shell 13, and the periphery of the support plate 21 is connected to the middle shell 13.

[0017] To further improve the connection stability between the intermediate shell 13 and the magnetic circuit system 2, the intermediate shell 13 may optionally include a first intermediate shell 131 and a second intermediate shell 132 extending along a first direction. In this embodiment, as... Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the periphery of the support plate 21 is sandwiched between the first middle shell 131 and the second middle shell 132.

[0018] To further improve the connection strength between the first housing 11 and the second housing 12, in one embodiment, the sound-generating device 100 further includes a plurality of connectors 7 spaced apart, each connector 7 extending along a first direction, with one end of the connector 7 connected to the first housing 11 and the other end of the connector 7 connected to the second housing 12.

[0019] Optionally, the first housing 11 and the second housing 12 can be metal parts. In this embodiment, the connector 7 is welded or bonded to the first housing 11 and the second housing 12. Of course, the first housing 11 and the second housing 12 can also be plastic parts, and this is not limited here.

[0020] Optionally, the sound-generating device 100 is square in shape. In this embodiment, as... Figure 1 and Figure 2 As shown, the vibration direction of the first vibration system 3 and the second vibration system 4 is the first direction, and the first direction is defined as the Z-axis direction (that is, the thickness direction of the sound-generating device 100). The length direction of the sound-generating device 100 is defined as the second direction, and the second direction is defined as the Y-axis direction. The width direction of the sound-generating device 100 is defined as the third direction, and the third direction is defined as the X-axis direction. That is, the first direction, the second direction, and the third direction are perpendicular to each other.

[0021] In this embodiment, by placing the first vibration system 3 and the second vibration system 4 on opposite sides of the magnetic circuit system 2 along the first direction, the sound-generating device 100 has a dual vibration system structure. When the first vibration system 3 and the second vibration system 4 radiate sound waves of the same phase outward, the superposition of the two-sided sound waves can be achieved, which can significantly improve the performance of the sound-generating device and increase the overall loudness.

[0022] Optionally, the first vibration system 3 and the second vibration system 4 are symmetrically arranged with respect to the magnetic circuit system 2, that is, the first vibration system 3 and the second vibration system 4 are symmetrically arranged with respect to the support plate 21. This allows the first vibration system 3 and the second vibration system 4 to radiate sound waves of equal size and opposite phase. According to the superposition effect of dipoles, the two sound waves with opposite phases can cancel each other out to the greatest extent in the far field, greatly improving the sound leakage problem of the sound-generating device 100 during use, protecting user privacy, and improving user experience. Moreover, when the first vibration system 3 and the second vibration system 4 vibrate in opposite directions, their symmetrical arrangement with respect to the magnetic circuit system 2 can effectively cancel out vibrations, reducing the shell vibration problem of the end product.

[0023] In this embodiment, as Figures 1 to 9As shown, the magnetic circuit system 2 is configured as a support plate 21 and a magnet assembly 22 disposed on the support plate 21. The magnet assembly 22 is configured as a central magnetic part 221 and side magnetic parts 222 disposed outside the central magnetic part 221. The central magnetic part 221 is configured as a first central magnetic part 2214 and a second central magnetic part 2215 stacked along a first direction, and the side magnetic parts 222 are configured as a first side magnetic part 2224 and a second side magnetic part 2225 stacked along the first direction. By providing a central mounting hole 211 and a side mounting hole 212 spaced apart on the support plate 21, part of the first central magnetic part of the central magnetic part 221 is thus mounted. 2214 and part of the second central magnet 2215 are embedded in the central mounting hole 211 and connected to each other. Part of the first side magnet 2224 and part of the second side magnet 2225 are embedded in the side mounting hole 212 and connected to each other. This can reduce the assembly volume between the support plate 21 and the magnet assembly 22, realize the lightweight and thin design of the sound-generating device 100, and meet the requirements of the end product for the thinness of the sound-generating device 100. Moreover, under the same thickness requirement, the above arrangement can increase the magnet volume of the central magnet 221 and the side magnet 222, improve the BL value of the product, and thus improve the sound generation requirements of the sound-generating device 100.

[0024] Understandably, the first central magnetic portion 2214 and the second central magnetic portion 2215 of the central magnetic portion 221 of the magnet assembly 22 are separate structures, and optionally, the first central magnetic portion 2214 and the second central magnetic portion 2215 are bonded together. The first side magnetic portion 2224 and the second side magnetic portion 2225 of the side magnetic portion 222 of the magnet assembly 22 are also separate structures, and optionally, the first side magnetic portion 2224 and the second side magnetic portion 2225 are bonded together. A first magnetic gap 223 is formed by a first side magnetic part 2224 located on the first side and a first central magnetic part 2214 located on the first side, spaced apart. A second magnetic gap 224 is formed by a second side magnetic part 2225 located on the second side and a second central magnetic part 2215 located on the second side, spaced apart. Simultaneously, a first vibration system 3 and a second vibration system 4 are respectively disposed on both sides of the magnetic circuit system along the first direction, such that the first voice coil 32 of the first vibration system 3 is correspondingly disposed with respect to the first magnetic gap 223, and the second voice coil 42 of the second vibration system 4 is correspondingly disposed with respect to the second magnetic gap 224. This allows the first vibration system 3 and the second vibration system 4 to share a single magnetic circuit system 2, reducing the thickness of the sound-generating device 100 in the Z direction and achieving ultra-high sensitivity. The thin design allows the sound-generating device 100 to be configured with a dual-vibration system structure. When the first vibration system 3 and the second vibration system 4 radiate sound waves of the same phase, double-sided radiation and double loudness can be achieved, significantly improving the performance and overall loudness of the sound-generating device 100. When the first vibration system 3 and the second vibration system 4 radiate sound waves of opposite phase, the two sound sources will generate two equal-sized, opposite-phase sound fields. Therefore, two equal-sized, opposite-phase sound waves will be received at the far-field position. According to the superposition effect of dipoles, the sound waves at this far-field position can cancel each other out to the greatest extent, greatly improving the sound leakage problem of the sound-generating device 100 during use, protecting user privacy, and improving user experience.

[0025] In this embodiment, to ensure that the driving force of the magnetic circuit system 2 on the first vibration system 3 and the second vibration system 4 is the same or substantially the same, the first central magnetic part 2214 and the second central magnetic part 2215 are optionally arranged symmetrically with respect to the support plate 21. Alternatively, the first side magnetic part 2224 and the second side magnetic part 2225 are optionally arranged symmetrically with respect to the support plate 21.

[0026] Understandably, to ensure that the first vibration system 3 and the second vibration system 4 can radiate sound waves of equal size and opposite phase, the first vibration system 3 and the second vibration system 4 may be symmetrically arranged with respect to the support plate 21. In this embodiment, the support plate 21 of the magnetic circuit system 2 is made of a magnetically conductive material; or, the support plate 21 of the magnetic circuit system 2 may be made of a non-magnetically conductive material, which is not limited here.

[0027] To ensure vibration space for the first diaphragm assembly 31, in this embodiment, the periphery of the first housing 11 bends and extends towards the middle housing 13 along a first direction, so that the side of the first housing 11 facing the first diaphragm assembly 31 is spaced apart from the first diaphragm assembly 31. Optionally, as Figures 3 to 6 , Figure 10 As shown, the first diaphragm assembly 31 includes a first folded ring 3111 that extends recessed toward the magnetic circuit system 2, thereby further preventing the first housing 11 from interfering with the first folded ring 3111.

[0028] To further prevent the magnet assembly 22 from interfering with the first fold ring 3111 of the first diaphragm assembly 31, in one embodiment, as follows: Figure 4 and Figure 6 As shown, the inner wall of the middle shell 13 is spaced from the first side magnet 2224 to form a first clearance gap 161 to avoid the first folded ring 3111. This first clearance gap 161 allows the first folded ring 3111 to be avoided, while providing vibration space for the first folded ring 3111. Furthermore, assuming the first diaphragm assembly 31 has the same amplitude, the above arrangement can reduce the space occupied by the sound-generating device 100 along the first direction, enabling a thinner design of the sound-generating device 100.

[0029] To ensure vibration space for the second diaphragm assembly 41, in this embodiment, the periphery of the second housing 12 bends and extends towards the middle housing 13 along a first direction, so that the side of the second housing 12 facing the second diaphragm assembly 41 is spaced apart from the second diaphragm assembly 41. Optionally, as Figures 3 to 6 , Figure 10 As shown, the second diaphragm assembly 41 includes a second folded ring 4111 that extends recessed toward the magnetic circuit system 2, thereby further preventing the second housing 12 from interfering with the second folded ring 4111.

[0030] To further avoid interference between the magnet assembly 22 and the second folded ring 4111 of the second diaphragm assembly 41, in one embodiment, such as Figure 4 and Figure 6 As shown, the inner wall of the middle shell 13 is spaced from the second side magnet 2225 to form a second clearance gap 162 to avoid the second fold ring 4111. This allows the second clearance gap 162 to avoid the second fold ring 4111 and provides vibration space for it. Furthermore, assuming the second diaphragm assembly 41 has the same amplitude, this arrangement can reduce the space occupied by the sound-generating device 100 along the first direction, enabling a thinner design for the sound-generating device 100.

[0031] In one embodiment, a first groove 2216 is provided on the periphery of the support plate 21 at the connection between the first central magnetic part 2214 and the second central magnetic part 2215. The portion of the support plate 21 adjacent to the central mounting hole 211 is accommodated in the first groove 2216 and is fitted against the groove wall of the first groove 2216. The hole wall of the central mounting hole 211 is fitted against the groove wall of the first groove 2216.

[0032] In this embodiment, as Figure 4 , Figures 6 to 9 As shown, by providing a first groove 2216 on the periphery of the side wall at the connection between the first central magnetic part 2214 and the second central magnetic part 2215 of the central magnetic part 221, a portion of the support plate 21 is accommodated in the first groove 2216, that is, the portion of the support plate 21 near the central mounting hole 211 is engaged in the first groove 2216, thereby further improving the connection stability between the first central magnetic part 2214 and the second central magnetic part 2215 of the central magnetic part 221 and the support plate 21.

[0033] Understandably, the outer periphery of the first central magnetic part 2214 near the second central magnetic part 2215 is recessed to form a first notch, and the outer periphery of the second central magnetic part 2215 near the first central magnetic part 2214 is recessed to form a second notch. Thus, when the first central magnetic part 2214 and the second central magnetic part 2215 are connected, the first notch and the second notch surround the sidewalls at the connection point of the first central magnetic part 2214 and the second central magnetic part 2215 to form a first groove 2216. Optionally, the first notch and the second notch are symmetrically arranged at the connection point of the first central magnetic part 2214 and the second central magnetic part 2215.

[0034] In this embodiment, when a portion of the first central magnetic part 2214 and a portion of the second central magnetic part 2215 are embedded in the central mounting hole 211, the portion of the support plate 21 adjacent to the central mounting hole 211 is fitted with the groove wall of the first groove 2216, and the hole wall of the central mounting hole 211 is fitted with the groove wall of the first groove 2216. This allows the first central magnetic part 2214 and the second central magnetic part 2215 of the central magnetic part 221 to be embedded in the central mounting hole 211 of the support plate 21, achieving "zero fit". This makes the connection between the first central magnetic part 2214 and the second central magnetic part 2215 and the support plate 21 almost completely fitted, eliminating assembly tolerances and material tolerances, and maximizing the volume of the central magnetic part 221. Moreover, the above-mentioned arrangement can also improve the connection between the support plate 21 and the first central magnetic part 2214 and the second central magnetic part 2215 of the central magnetic part 221, effectively preventing the first central magnetic part 2214 and the second central magnetic part 2215 from separating from the support plate 21, thereby improving the structural reliability of the magnetic circuit system 2 while realizing the ultra-thin design of the magnetic circuit.

[0035] Optionally, the first central magnetic part 2214 and the second central magnetic part 2215 are symmetrically arranged with respect to the support plate 21, that is, the first groove 2216 is located at the middle position of the side wall periphery of the central magnetic part 221 along the first direction.

[0036] In one embodiment, a second groove 2226 is provided on the periphery of the support plate 21 at the connection between the first side magnetic part 2224 and the second side magnetic part 2225. A portion of the support plate 21 adjacent to the side mounting hole 212 is accommodated in the second groove 2226 and is fitted against the groove wall of the second groove 2226. The hole wall of the side mounting hole 212 is fitted against the groove wall of the first groove 2216.

[0037] In this embodiment, as Figure 4 , Figures 6 to 9 As shown, by providing a second groove 2226 on the periphery of the side wall at the connection between the first side magnetic part 2224 and the second side magnetic part 2225 of the side magnetic part 222, a portion of the support plate 21 is accommodated in the second groove 2226, that is, the portion of the support plate 21 near the side mounting hole 212 is engaged in the second groove 2226, thereby further improving the connection stability between the side magnetic part 222 and the support plate 21.

[0038] Understandably, the outer periphery of the first magnetic part 2224 near the second magnetic part 2225 forms a third notch, and the outer periphery of the second magnetic part 2225 near the first magnetic part 2224 forms a fourth notch. Thus, when the first magnetic part 2224 and the second magnetic part 2225 are connected, the third and fourth notches surround the sidewalls at the connection point of the first magnetic part 2224 and the second magnetic part 2225 to form a second groove 2226. Optionally, the third and fourth notches are symmetrically arranged at the connection point of the first magnetic part 2224 and the second magnetic part 2225.

[0039] In this embodiment, when a portion of the first side magnet 2224 and a portion of the second side magnet 2225 are embedded in the side mounting hole 212, the portion of the support plate 21 adjacent to the side mounting hole 212 is fitted with the groove wall of the second groove 2226, and the hole wall of the side mounting hole 212 is fitted with the groove wall of the second groove 2226. This allows the first side magnet 2224 and the second side magnet 2225 of the side magnet 222 to be embedded in the side mounting hole 212 of the support plate 21, achieving "zero fit". This makes the connection between the first side magnet 2224 and the second side magnet 2225 and the support plate 21 almost completely fit, eliminating assembly tolerances and material tolerances, and maximizing the volume of the magnet assembly 22. Moreover, the above-mentioned arrangement can also improve the connection between the support plate 21 and the first side magnetic part 2224 and the second side magnetic part 2225 of the side magnetic part 222, effectively preventing the first side magnetic part 2224 and the second side magnetic part 2225 from separating from the support plate 21, thereby improving the structural reliability of the magnetic circuit system 2 while realizing the ultra-thin design of the magnetic circuit.

[0040] Optionally, the first side magnetic part 2224 and the second side magnetic part 2225 are symmetrically arranged with respect to the support plate 21, that is, the second groove 2226 is located at the middle position of the side wall periphery of the side magnetic part 222 along the first direction.

[0041] In one embodiment, the side magnetic portion 222 includes two, both of which extend along the second direction and the central magnetic portion 221. The two side magnetic portions 222 are symmetrically arranged on opposite sides of the central magnetic portion 221 along the third direction. The first direction, the second direction, and the third direction are arranged perpendicularly to each other.

[0042] In this embodiment, as Figures 3 to 9 As shown, the side magnetic portion 2222 includes two first side magnetic portions 2224 and two second side magnetic portions 2225. Both first side magnetic portions 2224 and the first central magnetic portion 2214 extend along a second direction, and the two first side magnetic portions 2224 are symmetrically arranged on opposite sides of the first central magnetic portion 2214 along a third direction; simultaneously, both second side magnetic portions 2225 and the second central magnetic portion 2215 extend along the second direction, and the two second side magnetic portions 2225 are symmetrically arranged on opposite sides of the second central magnetic portion 2215 along a third direction.

[0043] In one embodiment, the first voice coil 32 is an integrally wound structure and extends along a first direction. The first voice coil 32 has a height along the first direction. The height of the first voice coil 32 is greater than the thickness of the first voice coil 32, and the thickness of the first voice coil 32 is less than the width of the first magnetic gap 223.

[0044] In this embodiment, as Figures 3 to 6As shown, the first voice coil 32 is an integral voice coil extending along a first direction, formed by winding the same wire. The first voice coil 32 has a height along the first direction. Optionally, the height of the first voice coil 32 is greater than the thickness of the first voice coil 32. It should be noted that the thickness of the first voice coil 32 is the distance between the inner and outer wall surfaces of the annular voice coil.

[0045] Understandably, since the height of the first voice coil 32 is greater than its thickness, it is less affected by changes in the magnetic field during vibration, especially when the vibration amplitude is relatively large. The BL(x) curve is significantly flatter, which significantly reduces the distortion of the sound-generating device 100 and improves the sound quality.

[0046] In this embodiment, the first voice coil 32 is opposite to the first magnetic gap 223, and the thickness of the first voice coil 32 is less than the width of the first magnetic gap 223. During vibration, one end of the first voice coil 32 can extend into the first magnetic gap 223. The first magnetic gap 223 provides clearance for the corresponding end of the first voice coil 32, which can ensure the vibration amplitude of the first voice coil 32 when the thickness of the sound-generating device 100 is constant; or, when the vibration amplitude of the first voice coil 32 is constant, the thickness of the sound-generating device 100 can be reduced to facilitate a thinner design.

[0047] In one embodiment, the second voice coil 42 is an integrally wound structure and extends along a first direction. The second voice coil 42 has a height along the first direction. The height of the second voice coil 42 is greater than the thickness of the second voice coil 42, and the thickness of the second voice coil 42 is less than the width of the second magnetic gap 224.

[0048] In this embodiment, as Figures 3 to 6 As shown, the second voice coil 42 is formed by winding the same wire to create an integral voice coil extending along the first direction, and the second voice coil 42 has a height along the first direction. Optionally, the height of the second voice coil 42 is greater than the thickness of the second voice coil 42. It should be noted that the thickness of the second voice coil 42 is the distance between the inner and outer wall surfaces of the annular voice coil.

[0049] Understandably, since the height of the second voice coil 42 is greater than its thickness, it is less affected by changes in the magnetic field during vibration, especially when the vibration amplitude is relatively large. The BL(x) curve is significantly flatter, which significantly reduces the distortion of the sound-generating device 100 and improves the sound quality.

[0050] In this embodiment, the second voice coil 42 is opposite to the second magnetic gap 224, and the thickness of the second voice coil 42 is less than the width of the second magnetic gap 224. During vibration, one end of the second voice coil 42 can extend into the second magnetic gap 224, and the second magnetic gap 224 provides a buffer for the corresponding end of the second voice coil 42. This ensures the vibration amplitude of the second voice coil 42 while maintaining a certain thickness of the sound-generating device 100; or, while maintaining a certain vibration amplitude of the second voice coil 42, the thickness of the sound-generating device 100 can be reduced to facilitate a thinner design.

[0051] In one embodiment, the first central magnetic part 2214 includes a first central magnet 2217 and a first central magnetic plate 2212 stacked on the first central magnet 2217; the second central magnetic part 2215 includes a second central magnet 2218 and a second central magnetic plate 2213 stacked on the second central magnet 2218; a portion of the first central magnet 2217 and a portion of the second central magnet 2218 are embedded in the central mounting hole 211 and connected to each other; the first side magnetic part 2224 includes a first side magnet 2227 and a first side magnetic plate 2222 stacked on the first side magnet 2227; the second side magnetic part 2225 includes a second side magnet 2228 and a second side magnetic plate 2223 stacked on the second side magnet 2228; a portion of the first side magnet 2227 and a portion of the second side magnet 2228 are embedded in the side mounting hole 212 and connected to each other.

[0052] In this embodiment, as Figure 3 , Figure 4 and Figure 7 As shown, by configuring the first central magnetic part 2214 as the first central magnet 2217 and the first central magnetic guide plate 2212, and the second central magnetic part 2215 as the second central magnet 2218 and the second central magnetic guide plate 2213, a portion of the first central magnet 2217 and a portion of the second central magnet 2218 are embedded in the central mounting hole 211 and connected to each other. The first central magnetic guide plate 2212 and the second central magnetic guide plate 2213 are located on the sides of the first central magnet 2217 and the second central magnet 2218 that are far apart from each other, thus connecting the sides of the first central magnet 2217 and the second central magnet 2218 within the central mounting hole 211. This effectively increases the volume of the first central magnet 2217 and the second central magnet 2218, thereby improving the sound production performance of the sound-generating device 100, and reducing the assembly volume between the magnet assembly 22 and the support plate 21. This achieves an ultra-thin and lightweight design of the magnetic circuit system 2 while meeting performance requirements.

[0053] Meanwhile, by configuring the first side magnetic part 2224 as the first side magnet 2227 and the first side magnetic guide plate 2222, and the second side magnetic part 2225 as the second side magnet 2228 and the second side magnetic guide plate 2223, a portion of the first side magnet 2227 and a portion of the second side magnet 2228 are embedded in the side mounting hole 212 and connected to each other. This allows the first side magnetic guide plate 2222 and the second side magnetic guide plate 2223 to be located on the sides of the first side magnet 2227 and the second side magnet 2228 that are far apart from each other, thus connecting the sides of the first side magnet 2227 and the second side magnet 2228 within the side mounting hole 212. This effectively increases the volume of the first side magnet 2227 and the second side magnet 2228, thereby improving the sound production performance of the sound-generating device 100, and reducing the assembly volume between the magnet assembly 22 and the support plate 21. This achieves an ultra-thin and lightweight design of the magnetic circuit system 2 while meeting performance requirements.

[0054] Understandably, the first central magnet 2217 and the second central magnet 2218 are separate structures, with one side of the first central magnet 2217 and the second central magnet 2218 connected to each other within the central mounting hole 211. Optionally, the first central magnet 2217 and the second central magnet 2218 are bonded together. The first side magnet 2227 and the first side magnetic guide plate 2222 are separate structures, with one side of the first side magnet 2227 and the second side magnet 2228 connected to each other within the side mounting hole 212. Optionally, the first side magnet 2227 and the second side magnet 2228 are bonded together.

[0055] In this embodiment, a first groove 2216 is provided on the periphery of the side wall at the connection between the first central magnet 2217 and the second central magnet 2218. Part of the first central magnet 2217 and part of the second central magnet 2218 are embedded in the central mounting hole 211, so that part of the support plate 21 is accommodated in the first groove 2216. That is, the part of the support plate 21 near the central mounting hole 211 is engaged in the first groove 2216, thereby further improving the connection stability between the first central magnet 2217 and the second central magnet 2218 of the central magnetic part 221 and the support plate 21. This is not limited here.

[0056] Of course, a second groove 2226 is provided on the periphery of the side wall at the connection between the first side magnet 2227 and the second side magnet 2228. Part of the first side magnet 2227 and part of the second side magnet 2228 are embedded in the side mounting hole 212, so that part of the support plate 21 is accommodated in the second groove 2226. That is, the part of the support plate 21 near the side mounting hole 212 is engaged in the second groove 2226, thereby further improving the connection stability between the first side magnet 2227 and the second side magnet 2228 and the support plate 21. This is not limited here.

[0057] Understandably, the first central magnetic part 2214 and the second central magnetic part 2215 of the central magnetic part 221 are symmetrically arranged with respect to the support plate 21, that is, the first central magnet 2217 and the second central magnet 2218 are symmetrically arranged with respect to the support plate 21, and the first central magnetic guiding plate 2212 and the second central magnetic guiding plate 2213 are symmetrically arranged with respect to the support plate 21. The first side magnetic part 2224 and the second side magnetic part 2225 of the side magnetic part 222 are symmetrically arranged with respect to the support plate 21, that is, the first side magnet 2227 and the second side magnet 2228 are symmetrically arranged with respect to the support plate 21, and the first side magnetic guiding plate 2222 and the second side magnetic guiding plate 2223 are symmetrically arranged with respect to the support plate 21.

[0058] In this embodiment, the first central magnet 2217 and the second central magnet 2218 are both magnetized along the first direction and the magnetization directions are the same. The first side magnet 2227 and the second side magnet 2228 are both magnetized along the first direction and the magnetization directions are the same. The magnetization directions of the first central magnet 2217 and the first side magnet 2227 are opposite, and the magnetization directions of the second central magnet 2218 and the second side magnet 2228 are opposite. This configuration allows the first central magnet 2217 on the first side to be magnetized by the first central magnetic plate 2212, and the first side magnet 2227 to be magnetized by the first side magnetic plate 2222, so that the first voice coil 32 is located in the area of ​​dense magnetic field lines. The second central magnet 2218 on the second side is magnetized by the second central magnetic plate 2213, and the second side magnet 2228 is magnetized by the second side magnetic plate 2223, so that the second voice coil 42 is located in the area of ​​dense magnetic field lines. Thus, the central magnetic part 221 and the side magnetic part 222 of the magnet assembly 22 work together to form a magnetic circuit, which simultaneously drives the first voice coil 32 and the second voice coil 42 to vibrate.

[0059] In one embodiment, a first cavity 151 is formed between the first diaphragm assembly 31 and the first housing 11, and a second cavity 152 is formed between the first diaphragm assembly 31 and the magnetic circuit system 2; a third cavity 153 is formed between the second diaphragm assembly 41 and the magnetic circuit system 2, and a fourth cavity 154 is formed between the second diaphragm assembly 41 and the second housing 12; wherein, the first housing 11 is provided with a first sound outlet 111 communicating with the first cavity 151, the second housing 12 is provided with a second sound outlet 121 communicating with the fourth cavity 154, the middle housing 13 is provided with a third sound outlet 133 communicating with the second cavity 152, and the middle housing 13 is provided with a fourth sound outlet 134 communicating with the third cavity 153.

[0060] In this embodiment, as Figures 1 to 6As shown, by providing a first sound outlet 111, a second sound outlet 121, a third sound outlet 133, and a fourth sound outlet 134 on the outer casing 1, the first sound outlet 111 connects to the first cavity 151, the third sound outlet 133 connects to the second cavity 152, the fourth sound outlet 134 connects to the third cavity 153, and the second sound outlet 121 connects to the fourth cavity 154. In this way, the sound-generating device 100 can generate sound or release air through the third sound outlet 133 / first sound outlet 111 to ensure the pressure difference between the two sides of the first diaphragm assembly 31, and generate sound or release air through the fourth sound outlet 134 / second sound outlet 121 to ensure the pressure difference between the two sides of the second diaphragm assembly 41.

[0061] Optionally, such as Figures 2 to 6 As shown, the third sound outlet 133 and the fourth sound outlet 134 are located on the same side of the sound-generating device 100. It is understandable that this arrangement allows the third sound outlet 133 and the fourth sound outlet 134 of the sound-generating device 100 to easily communicate with the front cavity when applied to an electronic device. Alternatively, the electronic device can also have sound outlets that directly correspond to and communicate with the third sound outlet 133 and the fourth sound outlet 134, respectively.

[0062] Of course, the first sound outlet 111 and the second sound outlet 121 can be located on the other side of the sound-generating device 100. With this arrangement, when the sound-generating device 100 is applied to an electronic device, the first sound outlet 111 and the second sound outlet 121 of the sound-generating device 100 can be easily connected to the rear cavity. Of course, vents that directly correspond to and communicate with the first sound outlet 111 and the second sound outlet 121 can also be provided on the electronic device, and this is not limited here.

[0063] Optionally, the first sound outlet 111, the second sound outlet 121, the third sound outlet 133 and the fourth sound outlet 134 may each include multiple outlets, with multiple corresponding outlets spaced apart, so that the sound wave airflow can flow smoothly and quickly, thereby improving the sound production effect.

[0064] In one embodiment, the first vibration system 3 further includes a first centering support 33, which includes a first outer fixing part 331, a first inner fixing part 332, and a first elastic arm part 333 connecting the first outer fixing part 331 and the first inner fixing part 332. The first outer fixing part 331 is connected to the first housing 11, and the first inner fixing part 332 is connected to the first voice coil 32.

[0065] In this embodiment, as Figure 3 and Figure 5 As shown, by using the first centering support 33 to center the first voice coil 32, the polarization or oscillation of the first voice coil 32 during vibration is prevented, thereby improving the operational stability of the first vibration system 3.

[0066] In one embodiment, the second vibration system 4 further includes a second centering support 43, which includes a second outer fixing part 431, a second inner fixing part 432, and a second spring arm part 433 connecting the second outer fixing part 431 and the second inner fixing part 432. The second outer fixing part 431 is connected to the second housing 12, and the second inner fixing part 432 is connected to the second voice coil 42.

[0067] In this embodiment, as Figure 3 and Figure 5 As shown, by using the second centering support 43 to center the second voice coil 42, the polarization or oscillation of the second voice coil 42 during vibration is avoided, thereby improving the operational stability of the second vibration system 4.

[0068] In one embodiment, the sound-generating device 100 further includes a first auxiliary magnet assembly 5 and a second auxiliary magnet assembly 6. The first auxiliary magnet assembly 5 is disposed inside the housing 1 and located on the side of the first vibration system 3 facing away from the magnetic circuit system 2. The first auxiliary magnet assembly 5 has a first auxiliary magnetic gap 53. A first magnetic field line dense area 54 for accommodating the first voice coil 32 is formed between the first auxiliary magnet assembly 5 and the magnetic circuit system 2. One end of the first voice coil 32 is correspondingly disposed with the first magnetic gap 223, and the other end of the first voice coil 32 is correspondingly disposed with the first auxiliary magnetic gap 53. The second auxiliary magnet assembly 6 is disposed inside the housing 1 and located on the side of the second vibration system 4 facing away from the magnetic circuit system 2. The second auxiliary magnet assembly 6 has a second auxiliary magnetic gap 63. A second magnetic field line dense area 64 for accommodating the second voice coil 42 is formed between the second auxiliary magnet assembly 6 and the magnetic circuit system 2. One end of the second voice coil 42 is correspondingly disposed with the second magnetic gap 224, and the other end of the second voice coil 42 is correspondingly disposed with the second auxiliary magnetic gap 63.

[0069] In this embodiment, as Figure 5 , Figure 6 and Figure 9 As shown, by setting the first auxiliary magnet assembly 5, the first diaphragm assembly 31 is provided with the first auxiliary magnet assembly 5 and the magnet assembly 22 on opposite sides along the first direction. The first auxiliary magnet assembly 5 is provided with a first auxiliary magnetic gap 53 corresponding to one end of the first voice coil 32, and the magnet assembly 22 is provided with a first magnetic gap 223 corresponding to the other end of the first voice coil 32. In this way, the first auxiliary magnet assembly 5 and the magnet assembly 22 of the sound generating device 100 respectively form magnetic fields on opposite sides of the first diaphragm assembly 31. The above arrangement makes the magnetic field distribution in the vibration area of ​​the first voice coil 32 more uniform, which can provide the first voice coil 32 with a larger driving force that changes slowly and flatly with displacement, reduce the risk of distortion, and thus improve the acoustic performance of the sound generating device 100.

[0070] At the same time, such as Figure 5 , Figure 6 and Figure 9 As shown, by setting the second auxiliary magnet assembly 6, the second diaphragm assembly 41 is provided with magnet assembly 22 and the second auxiliary magnet assembly 6 on opposite sides along the first direction, and the magnet assembly 22 is provided with a second magnetic gap 224 corresponding to one end of the second voice coil 42, and the second auxiliary magnet assembly 6 is provided with a second auxiliary magnetic gap 63 corresponding to the other end of the second voice coil 42. In this way, the magnet assembly 22 and the second auxiliary magnet assembly 6 of the sound generating device 100 respectively form magnetic fields on opposite sides of the second diaphragm assembly 41. The above arrangement makes the magnetic field distribution in the vibration area of ​​the second voice coil 42 more uniform, which can provide the second voice coil 42 with a larger driving force that changes slowly and flatly with displacement, reduce the risk of distortion, and thus improve the acoustic performance of the sound generating device 100.

[0071] In one embodiment, the first central magnetic part 2214 includes a first central magnet 2217, and the second central magnetic part 2215 includes a second central magnet 2218. A portion of the first central magnet 2217 and a portion of the second central magnet 2218 are embedded in the central mounting hole 211 and connected to each other. The first side magnetic part 2224 includes a first side magnet 2227, and the second side magnetic part 2225 includes a second side magnet 2228. A portion of the first side magnet 2227 and a portion of the second side magnet 2228 are embedded in the side mounting hole 212 and connected to each other.

[0072] In this embodiment, as Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown, by setting the first central magnet 2214 as the first central magnet 2217 and the second central magnet 2215 as the second central magnet 2218, a portion of the first central magnet 2217 and a portion of the second central magnet 2218 are embedded in the central mounting hole 211 and connected to each other, such that the first central magnet 2217 and the second central magnet 2218 are connected to each other on the same side within the central mounting hole 211. This effectively increases the volume of the first central magnet 2217 and the second central magnet 2218, thereby improving the sound production performance of the sound-generating device 100.

[0073] Meanwhile, by setting the first side magnet 2224 as the first side magnet 2227 and the second side magnet 2225 as the second side magnet 2228, a portion of the first side magnet 2227 and a portion of the second side magnet 2228 are embedded in the side mounting hole 212 and connected to each other, so that the first side magnet 2227 and the second side magnet 2228 are connected to each other on the side of the side mounting hole 212. This effectively increases the volume of the first side magnet 2227 and the second side magnet 2228, thereby improving the sound production performance of the sound generating device 100.

[0074] Understandably, the first central magnet 2217 and the second central magnet 2218 are separate structures, with one side of the first central magnet 2217 and the second central magnet 2218 connected to each other within the central mounting hole 211. Optionally, the first central magnet 2217 and the second central magnet 2218 are bonded together. The first side magnet 2227 and the first side magnetic guide plate 2222 are separate structures, with one side of the first side magnet 2227 and the second side magnet 2228 connected to each other within the side mounting hole 212. Optionally, the first side magnet 2227 and the second side magnet 2228 are bonded together.

[0075] In this embodiment, the sides of the first central magnet 2217 and the first side magnet 2227 facing the first diaphragm assembly 31 are both exposed in the internal cavity of the sound-generating device 100, and the sides of the second central magnet 2218 and the second side magnet 2228 facing the second diaphragm assembly 41 are also exposed in the internal cavity of the sound-generating device 100. This eliminates the central washer and side washer structures on opposite sides of the magnet assembly 22 in the magnetic circuit system 2, thereby reducing the thickness of the sound-generating device 100 in the Z direction and increasing the volume of the first central magnet 2217 and the first side magnet 2227, the second central magnet 2218 and the second side magnet 2228 of the magnet assembly 22, thus improving the BL value.

[0076] Understandably, a first groove 2216 is provided on the periphery of the side wall at the connection between the first central magnet 2217 and the second central magnet 2218. Part of the first central magnet 2217 and part of the second central magnet 2218 are embedded in the central mounting hole 211, so that part of the support plate 21 is accommodated in the first groove 2216. That is, the part of the support plate 21 near the central mounting hole 211 is engaged in the first groove 2216, thereby further improving the connection stability between the first central magnet 2217 and the second central magnet 2218 of the central magnetic part 221 and the support plate 21. This is not limited here.

[0077] Of course, a second groove 2226 is provided on the periphery of the side wall at the connection between the first side magnet 2227 and the second side magnet 2228. Part of the first side magnet 2227 and part of the second side magnet 2228 are embedded in the side mounting hole 212, so that part of the support plate 21 is accommodated in the second groove 2226. That is, the part of the support plate 21 near the side mounting hole 212 is engaged in the second groove 2226, thereby further improving the connection stability between the first side magnet 2227 and the second side magnet 2228 and the support plate 21. This is not limited here.

[0078] In this embodiment, the first central magnetic portion 2214 and the second central magnetic portion 2215 of the central magnetic portion 221 are symmetrically arranged with respect to the support plate 21, that is, the first central magnet 2217 and the second central magnet 2218 are symmetrically arranged with respect to the support plate 21. The first side magnetic portion 2224 and the second side magnetic portion 2225 of the side magnetic portion 222 are symmetrically arranged with respect to the support plate 21, that is, the first side magnet 2227 and the second side magnet 2228 are symmetrically arranged with respect to the support plate 21.

[0079] In one embodiment, the first auxiliary magnet assembly 5 includes a first auxiliary central magnet 51 opposite to the first central magnet 2217 and a first auxiliary side magnet 52 opposite to the first side magnet 2227. The first auxiliary side magnet 52 is disposed outside the first auxiliary central magnet 51 and spaced apart from the first auxiliary central magnet 51 to form a first auxiliary magnetic gap 53. The sides of the first auxiliary central magnet 51 and the first auxiliary side magnet 52 facing the first diaphragm assembly 31 are both exposed in the internal cavity of the sound generating device 100. The second auxiliary magnet assembly 6 includes a second auxiliary central magnet 61 opposite to the second central magnet 2218 and a second auxiliary side magnet 62 opposite to the second side magnet 2228. The second auxiliary side magnet 62 is disposed outside the second auxiliary central magnet 61 and spaced apart from the second auxiliary central magnet 61 to form a second auxiliary magnetic gap 63. The sides of the second auxiliary central magnet 61 and the second auxiliary side magnet 62 facing the second diaphragm assembly 41 are both exposed in the internal cavity of the sound generating device 100.

[0080] In this embodiment, as Figure 5 , Figure 6 and Figure 9 As shown, by configuring the first auxiliary magnet assembly 5 as a first auxiliary center magnet 51 and a first auxiliary side magnet 52, the sides of the first auxiliary center magnet 51 and the first auxiliary side magnet 52 facing the first diaphragm assembly 31 are both exposed in the internal cavity of the sound-generating device 100. This eliminates the center washer and side washer structures of the first auxiliary magnet assembly 5, thereby further reducing the thickness of the sound-generating device 100 in the Z direction and increasing the volume of the magnets in the first auxiliary magnet assembly 5, thus improving the BL value. Moreover, a relatively long and uniformly distributed magnetic field region is formed between the first auxiliary magnet assembly 5 and the magnet assembly 22 in the first direction, resulting in more and denser magnetic field lines passing through the first voice coil 32, and a greater driving force. This provides the first voice coil 32 with a larger and flat driving force that changes slowly with displacement, resulting in a flatter BL(x) curve and reducing the risk of distortion.

[0081] Meanwhile, by setting the second auxiliary magnet assembly 6 as a second auxiliary center magnet 61 and a second auxiliary side magnet 62, the sides of the second auxiliary center magnet 61 and the second auxiliary side magnet 62 facing the second diaphragm assembly 41 are both exposed in the internal cavity of the sound-generating device 100. This eliminates the center washer and side washer structures of the second auxiliary magnet assembly 6, thereby further reducing the thickness of the sound-generating device 100 in the Z direction and increasing the volume of the magnets in the second auxiliary magnet assembly 6, thus improving the BL value. Moreover, a relatively long and uniformly distributed magnetic field region is formed between the magnet assembly 22 and the second auxiliary magnet assembly 6 in the first direction, resulting in more and denser magnetic field lines passing through the second voice coil 42, and a greater driving force. This provides the second voice coil 42 with a larger and flat driving force that changes slowly with displacement, resulting in a flatter BL(x) curve and reducing the risk of distortion.

[0082] Optionally, the first auxiliary center magnet 51 and the first auxiliary side magnet 52 are both magnetized along the first direction, but in opposite directions; the first center magnet 2217 and the first side magnet 2227 are both magnetized along the first direction, but in opposite directions; the first auxiliary center magnet 51 and the first center magnet 2217 are magnetized in opposite directions, and the first auxiliary side magnet 52 and the first side magnet 2227 are magnetized in opposite directions, thus forming a first magnetic field line density region 54 for accommodating the first voice coil 32 between the first auxiliary magnetic gap 53 and the first magnetic gap 223. Figure 9 As shown.

[0083] Understandably, this allows the first auxiliary center magnet 51 and the first center magnet 2217 to form a magnetic pair structure, and the first auxiliary side magnet 52 and the first side magnet 2227 to form a magnetic pair structure. Furthermore, the first auxiliary center magnet 51 and the first auxiliary side magnet 52 form a magnetic circuit, and the first center magnet 2217 and the first side magnet 2227 form a magnetic circuit. As a result, a magnetic field region (i.e., the first magnetic field line dense region 54) with a relatively long magnetic field distribution in the first direction is formed between the first auxiliary magnet assembly 5 and the magnet assembly 22. This makes the magnetic field lines more dense and uniform, and the first voice coil 32 can be in the dense magnetic field line region when it reciprocates along the first direction. This makes the BLx curve flatter, thereby reducing distortion.

[0084] Optionally, the second central magnet 2218 and the second side magnet 2228 are both magnetized along the first direction, but in opposite directions; the second auxiliary central magnet 61 and the second auxiliary side magnet 62 are both magnetized along the first direction, but in opposite directions; the magnetization directions of the second central magnet 2218 and the second auxiliary central magnet 61 are opposite, and the magnetization directions of the second side magnet 2228 and the second auxiliary side magnet 62 are opposite. A second magnetic field line density region 64 accommodating the second voice coil 42 is formed between the second magnetic gap 224 and the second auxiliary magnetic gap 63. Figure 9 As shown.

[0085] Understandably, this allows the second central magnet 2218 and the second auxiliary central magnet 61 to form a magnetic pair structure, and the second side magnet 2228 and the second auxiliary side magnet 62 to form a magnetic pair structure. Furthermore, the second central magnet 2218 and the second side magnet 2228 form a magnetic circuit, and the second auxiliary central magnet 61 and the second auxiliary side magnet 62 form a magnetic circuit. As a result, a magnetic field region (i.e., the second magnetic field line dense region 64) with a relatively long magnetic field distribution in the first direction is formed between the magnet assembly 22 and the second auxiliary magnet assembly 6. This makes the magnetic field lines more dense and uniform, and the second voice coil 42 can be in the dense magnetic field line region when it reciprocates along the first direction. This makes the BLx curve flatter, thereby reducing distortion.

[0086] In one embodiment, the distance between the end face of the first voice coil 32 facing the first central magnet 2217 and the first central magnet 2217 is the same as the distance between the end face of the first voice coil 32 facing the first auxiliary central magnet 51 and the first auxiliary central magnet 51.

[0087] In this embodiment, as Figure 6 and Figure 9 As shown, when the sound-generating device 100 is not working, the distance between the end face of the first voice coil 32 facing the first auxiliary magnet assembly 5 and the first auxiliary magnet assembly 5 is the same as the distance between the end face of the first voice coil 32 facing the magnet assembly 22 and the magnet assembly 22. This ensures that when the first voice coil 32 vibrates along the first direction, it can receive the same driving force on the first auxiliary magnet assembly 5 and the magnet assembly 22, thereby ensuring that the opposite sides of the first diaphragm assembly 31 can produce the same loudness and improving the sound-generating effect of the sound-generating device 100.

[0088] In one embodiment, the distance between the end face of the second voice coil 42 facing the second central magnet 2218 and the second central magnet 2218 is the same as the distance between the end face of the second voice coil 42 facing the second auxiliary central magnet 61 and the second auxiliary central magnet 61.

[0089] In this embodiment, as Figure 6 and Figure 9As shown, when the sound-generating device 100 is not working, the distance between the end face of the second voice coil 42 facing the magnet assembly 22 and the magnet assembly 22 is the same as the distance between the end face of the second voice coil 42 facing the second auxiliary magnet assembly 6 and the second auxiliary magnet assembly 6. This ensures that when the second voice coil 42 vibrates in the first direction, it can receive the same driving force on the magnet assembly 22 and the second auxiliary magnet assembly 6, so as to ensure that the opposite sides of the first diaphragm assembly 31 can produce the same loudness and improve the sound-generating effect of the sound-generating device 100.

[0090] In one embodiment, the first central magnet 2217 and the second central magnet 2218 are both magnetized along a first direction and in the same direction; the first side magnet 2227 and the second side magnet 2228 are both magnetized along the first direction and in the same direction; the magnetization directions of the first central magnet 2217 and the second central magnet 2218 are opposite to the magnetization directions of the first side magnet 2227 and the second side magnet 2228. The first auxiliary central magnet 51 and the first auxiliary side magnet 52 are both magnetized along the first direction and in opposite directions; the second auxiliary central magnet 61 and the second auxiliary side magnet 62 are both magnetized along the first direction and in opposite directions. The magnetization directions of the first central magnet 2217 and the second central magnet 2218 are opposite to the magnetization directions of the first auxiliary central magnet 51 and the second auxiliary central magnet 61; the magnetization directions of the first side magnet 2227 and the second side magnet 2228 are opposite to the magnetization directions of the first auxiliary side magnet 52 and the second auxiliary side magnet 62. In this embodiment, as Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown, the first central magnet 2217 and the second central magnet 2218 are separate structures, and the first central magnet 2217 and the second central magnet 2218 are connected to each other on one side within the central mounting hole 211. Optionally, both the first central magnet 2217 and the second central magnet 2218 are magnetized along a first direction, and the magnetization directions are the same. The first side magnet 2227 and the second side magnet 2228 are separate structures, and the first side magnet 2227 and the second side magnet 2228 are connected to each other on one side within the side mounting hole 212. Optionally, both the first side magnet 2227 and the second side magnet 2228 are magnetized along a first direction, and the magnetization directions are the same. In this case, the magnetization directions of the first central magnet 2217 and the second central magnet 2218 are opposite to the magnetization directions of the first side magnet 2227 and the second side magnet 2228. This allows the magnet assembly 22 of the magnetic circuit system 2 to collectively form a single magnetic circuit capable of simultaneously driving the first voice coil 32 and the second voice coil 42.

[0091] Understandably, this arrangement allows the magnetic circuit of the magnet assembly 22 on the first side to strengthen the magnetic field of the magnetic circuit of the magnet assembly 22 on the second side, increasing the product BL value of the sound-generating device 100, thereby increasing the driving force of the magnetic circuit system 2 on the second voice coil 42 and improving the sound-generating sensitivity of the sound-generating device 100. Simultaneously, the magnetic circuit of the magnet assembly 22 on the second side can strengthen the magnetic field of the magnetic circuit of the magnet assembly 22 on the first side, increasing the product BL value of the sound-generating device 100, thereby increasing the driving force of the magnetic circuit system 2 on the first voice coil 32 and improving the sound-generating sensitivity of the sound-generating device 100.

[0092] In this embodiment, as Figure 8 and Figure 9 As shown, the magnetization direction of the first auxiliary central magnet 51 is the same as that of the second auxiliary central magnet 61, the magnetization direction of the first auxiliary side magnet 52 is the same as that of the second auxiliary side magnet 62, and the magnetization directions of the first auxiliary central magnet 51 and the second auxiliary central magnet 61 are opposite to those of the first auxiliary side magnet 52 and the second auxiliary side magnet 62.

[0093] In one embodiment, such as Figure 1 , Figure 2 , Figure 6 As shown, the outer shell 1 includes a first shell 11, a second shell 12, and a middle shell 13 located between the first shell 11 and the second shell 12. The first auxiliary magnet assembly 5 is disposed on the side of the first shell 11 facing the first diaphragm assembly 31, and the second auxiliary magnet assembly 6 is disposed on the side of the second shell 12 facing the second diaphragm assembly 41.

[0094] Understandably, in order to ensure that the first auxiliary magnet assembly 5 forms a magnetic circuit, the first housing 11 of the housing 1 is optionally made of a magnetically conductive material. In order to ensure that the second auxiliary magnet assembly 6 forms a magnetic circuit, the second housing 12 of the housing 1 is optionally made of a magnetically conductive material.

[0095] In this embodiment, the first housing 11 has a first portion connected to the first auxiliary magnet assembly 5, and the second housing 12 has a second portion connected to the second auxiliary magnet assembly 6. Both the first and second portions are made of magnetically conductive material. This arrangement allows the first auxiliary center magnet 51 and the first auxiliary side magnet 52 of the first auxiliary magnet assembly 5 to form a magnetic circuit through the first portion of the first housing 11. This creates a relatively long and uniformly distributed magnetic field region (i.e., a first dense magnetic field line region 54) in the first direction between the magnet assembly 22 and the first auxiliary magnet assembly 5. This results in a denser and more uniform distribution of magnetic field lines, ensuring that the first voice coil 32 remains within this dense magnetic field line region during reciprocating vibration along the first direction. Consequently, the BLx curve becomes flatter, reducing distortion. Meanwhile, the second auxiliary center magnet 61 and the second auxiliary side magnet 62 of the second auxiliary magnet assembly 6 form a magnetic circuit through the second part of the second housing 12, thereby forming a magnetic field region (i.e., the second magnetic field line dense region 64) that is longer in the first direction and has a more uniform magnetic field distribution between the magnet assembly 22 and the second auxiliary magnet assembly 6. This makes the magnetic field lines more dense and uniform, and the second voice coil 42 can be in the dense magnetic field line region when it reciprocates along the first direction, thereby making the BLx curve flatter and reducing distortion.

[0096] To ensure that the loudness emitted by the first diaphragm assembly 31 and the second diaphragm assembly 41 is consistent, optionally, the first auxiliary center magnet 51 and the second auxiliary center magnet 61 are symmetrically arranged with respect to the support plate 21, and the first auxiliary side magnet 52 and the second auxiliary side magnet 62 are symmetrically arranged with respect to the support plate 21.

[0097] In one embodiment, such as Figure 5 , Figure 6 , Figure 8 and Figure 9As shown, the magnetic circuit system 2 includes two first side magnets 2227, both of which extend along the second direction and the first center magnet 2217 are symmetrically arranged on opposite sides of the first center magnet 2217 along the third direction; the magnetic circuit system 2 includes two second side magnets 2228, both of which extend along the second direction and the second center magnet 2218 are symmetrically arranged on opposite sides of the second center magnet 2218 along the third direction; the magnetic circuit system 2 includes two first auxiliary side magnets 52, both of which extend along the second direction and the first auxiliary center magnet 51 are symmetrically arranged on opposite sides of the first auxiliary center magnet 51 along the third direction; the magnetic circuit system 2 includes two second auxiliary side magnets 62, both of which extend along the second direction and the second auxiliary center magnet 61 are symmetrically arranged on opposite sides of the second auxiliary center magnet 61 along the third direction; wherein, the first direction, the second direction, and the third direction are arranged perpendicularly to each other.

[0098] In one embodiment, the outer casing 1 includes a first housing 11, a second housing 12, and an intermediate housing 13 located between the first housing 11 and the second housing 12. It is understood that the outer casing 1 is a split structure, which facilitates the installation of structures such as the magnetic circuit system 2, the first vibration system 3, the second vibration system 4, the first auxiliary magnet assembly 5, and the second auxiliary magnet assembly 6.

[0099] In this embodiment, as Figure 1 , Figure 2 , Figure 6 As shown, the periphery of the first diaphragm assembly 31 is sandwiched between the first housing 11 and the middle housing 13, the periphery of the second diaphragm assembly 41 is sandwiched between the second housing 12 and the middle housing 13, the periphery of the support plate 21 is connected to the middle housing 13, the first auxiliary magnet assembly 5 is disposed on the side of the first housing 11 facing the first diaphragm assembly 31, and the second auxiliary magnet assembly 6 is disposed on the side of the second housing 12 facing the second diaphragm assembly 41.

[0100] In one implementation, such as Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the middle shell 13 includes a first middle shell 131 and a second middle shell 132 extending along a first direction. Optionally, the periphery of the support plate 21 is sandwiched between the first middle shell 131 and the second middle shell 132.

[0101] It is understandable that the first middle shell 131 and the second middle shell 132 of the middle shell 13 can be metal or plastic parts, and no limitation is made here. By clamping the periphery of the support plate 21 between the first middle shell 131 and the second middle shell 132, the connection strength and connection stability between the middle shell 13 and the magnetic circuit system 2 can be improved.

[0102] In order to avoid interference between the first auxiliary magnet assembly 5 and the magnet assembly 22 of the sound-generating device 100 and the first folded ring 3111 of the first diaphragm assembly 31, in one embodiment, the first diaphragm assembly 31 includes a first folded ring 3111 extending recessed toward the magnetic circuit system 2, and the inner wall of the middle shell 13 is spaced apart from the first side magnet portion 2224 to form a first clearance gap 161 to avoid the first folded ring 3111.

[0103] Understandably, the outer periphery of the first diaphragm assembly 31 is sandwiched between the first housing 11 and the middle housing 13. Optionally, the outer periphery of the first diaphragm assembly 31 is sandwiched between the first housing 11 and the first middle housing 131. To ensure vibration space for the first diaphragm assembly 31, the periphery of the first housing 11 bends and extends towards the first middle housing 131 along a first direction, so that the first auxiliary magnet assembly 5 is moved away from the first diaphragm assembly 31, thereby providing vibration space for the first diaphragm assembly 31.

[0104] In this embodiment, as Figure 5 , Figure 6 and Figure 10 As shown, the first folded ring 3111 of the first diaphragm assembly 31 extends toward the magnet assembly 22, thus further preventing interference between the first housing 11 and the first folded ring 3111. To further prevent interference between the magnet assembly 22 and the first folded ring 3111 of the first diaphragm assembly 31, a first clearance gap 161 is formed by spacing the inner wall of the first middle housing 131 from the first side magnet portion 2224 of the magnet assembly 22. This clearance gap 161 allows the first folded ring 3111 to pass through and provides vibration space for the first folded ring 3111. Moreover, under the premise that the first diaphragm assembly 31 has the same amplitude, the above arrangement can reduce the space occupied by the sound generating device 100 along the first direction, and can realize a thinner design of the sound generating device 100.

[0105] In order to avoid interference between the magnet assembly 22 and the second auxiliary magnet assembly 6 of the sound-generating device 100 and the second folded ring 4111 of the second diaphragm assembly 41, in one embodiment, the second diaphragm assembly 41 includes a second folded ring 4111 extending recessed toward the magnetic circuit system 2, and the inner wall of the middle shell 13 is spaced from the second side magnet portion 2225 to form a second clearance gap 162 to avoid the second folded ring 4111.

[0106] Understandably, the outer periphery of the second diaphragm assembly 41 is sandwiched between the second housing 12 and the middle housing 13. Optionally, the outer periphery of the second diaphragm assembly 41 is sandwiched between the second housing 12 and the second middle housing 132. To ensure vibration space for the second diaphragm assembly 41, the periphery of the second housing 12 bends and extends towards the second middle housing 132 along a first direction, so that the second auxiliary magnet assembly 6 is moved away from the second diaphragm assembly 41, thereby providing vibration space for the second diaphragm assembly 41.

[0107] In this embodiment, as Figure 5 , Figure 6 and Figure 10 As shown, the second fold 4111 of the second diaphragm assembly 41 extends toward the magnet assembly 22, thus further preventing the second housing 12 from interfering with the second fold 4111. To further prevent the magnet assembly 22 from interfering with the second fold 4111 of the second diaphragm assembly 41, a second clearance gap 162 is formed by spacing the inner wall of the second housing 12 from the second side magnet portion 2225 of the magnet assembly 22. This clearance gap 162 allows the second fold 4111 to pass through and provides vibration space for the second fold 4111. Moreover, under the premise that the second diaphragm assembly 41 has the same amplitude, the above arrangement can reduce the space occupied by the sound generating device 100 along the first direction, and can realize a thinner design of the sound generating device 100.

[0108] In one embodiment, a first cavity 151 is formed between the first diaphragm assembly 31 and the first housing 11, and a second cavity 152 is formed between the first diaphragm assembly 31 and the magnetic circuit system 2; a third cavity 153 is formed between the second diaphragm assembly 41 and the magnetic circuit system 2, and a fourth cavity 154 is formed between the second diaphragm assembly 41 and the second housing 12; wherein, the first housing 11 is provided with a first sound outlet 111 communicating with the first cavity 151, the second housing 12 is provided with a second sound outlet 121 communicating with the fourth cavity 154, the middle housing 13 is provided with a third sound outlet 133 communicating with the second cavity 152, and the middle housing 13 is provided with a fourth sound outlet 134 communicating with the third cavity 153.

[0109] Understandably, the first auxiliary magnet assembly 5 is disposed in the first housing 11 and located within the first cavity 151, and the second auxiliary magnet assembly 6 is disposed in the second housing 12 and located within the fourth cavity 154. In this embodiment, as... Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, by providing a first sound outlet 111, a second sound outlet 121, a third sound outlet 133, and a fourth sound outlet 134 on the outer casing 1, the first sound outlet 111 connects to the first cavity 151, the third sound outlet 133 connects to the second cavity 152, the fourth sound outlet 134 connects to the third cavity 153, and the second sound outlet 121 connects to the fourth cavity 154. In this way, the sound-generating device 100 can generate sound or release air through the third sound outlet 133 / first sound outlet 111 to ensure the pressure difference between the two sides of the first diaphragm assembly 31, and generate sound or release air through the fourth sound outlet 134 / second sound outlet 121 to ensure the pressure difference between the two sides of the second diaphragm assembly 41.

[0110] Optionally, such as Figure 2 , Figure 5 , Figure 6 As shown, the third sound outlet 133 and the fourth sound outlet 134 are located on the same side of the sound-generating device 100. It is understandable that this arrangement allows the third sound outlet 133 and the fourth sound outlet 134 of the sound-generating device 100 to easily communicate with the front cavity when applied to an electronic device. Alternatively, the electronic device can also have sound outlets that directly correspond to and communicate with the third sound outlet 133 and the fourth sound outlet 134, respectively.

[0111] Of course, the first sound outlet 111 and the second sound outlet 121 can be located on the other side of the sound-generating device 100. With this arrangement, when the sound-generating device 100 is applied to an electronic device, the first sound outlet 111 and the second sound outlet 121 of the sound-generating device 100 can be easily connected to the rear cavity. Of course, vents that directly correspond to and communicate with the first sound outlet 111 and the second sound outlet 121 can also be provided on the electronic device, and this is not limited here.

[0112] Optionally, the first sound outlet 111, the second sound outlet 121, the third sound outlet 133 and the fourth sound outlet 134 may each include multiple outlets, with multiple corresponding outlets spaced apart, so that the sound wave airflow can flow smoothly and quickly, thereby improving the sound production effect.

[0113] In one embodiment, the first diaphragm assembly 31 radiates a first sound wave to the first cavity 151 and a second sound wave to the second cavity 152, the first and second sound waves being out of phase; the second diaphragm assembly 41 radiates a third sound wave to the third cavity 153 and a fourth sound wave to the fourth cavity 154, the third and fourth sound waves being out of phase.

[0114] In this embodiment, when the sound-generating device 100 is applied in an electronic device, it is connected to the first cavity 151, the second cavity 152, the third cavity 153, and the fourth cavity 154 through the sound output channel or the venting channel, respectively, so as to realize sound wave superposition or far-field noise reduction, thereby improving the sound-generating performance of the sound-generating device 100 and enhancing the user experience.

[0115] Optionally, the second and third sound waves are in phase, and the first and fourth sound waves are in phase. In one embodiment, the first diaphragm assembly 31 and the second diaphragm assembly 41 radiate sound waves of the same phase to the outside through the first sound outlet channel after passing through the second cavity 152 and the third cavity 153, and radiate sound waves of the same phase to the outside through the second sound outlet channel after passing through the first cavity 151 and the fourth cavity 154.

[0116] In this embodiment, by connecting the first sound outlet channel to the second cavity 152 and the third cavity 153 respectively, when the second and third sound waves radiate outward through the first sound outlet channel, the sound waves are superimposed due to their identical phase, thus increasing the loudness. Simultaneously, by connecting the second sound outlet channel (i.e., the venting channel) to the first cavity 151 and the fourth cavity 154 respectively, venting of the first cavity 151 and the fourth cavity 154 is achieved, ensuring the vibration performance of the first diaphragm assembly 31 and the second diaphragm assembly 41.

[0117] Alternatively, the second sound outlet channel can be connected to both the first cavity 151 and the fourth cavity 154. When both the first and fourth sound waves radiate outward through the second sound outlet channel, their phases are the same, resulting in sound wave superposition and increased loudness. However, since the first and second sound waves are out of phase, and the third and fourth sound waves are out of phase, when the sound waves radiate outward from the two sound outlet channels, from a fixed position at a greater distance in the environment, the positions of the two sound waves are relatively close. It can be assumed that the fixed position is approximately equidistant from the two sound waves, causing them to generate two equal-sized, opposite-phase sound fields. Therefore, the fixed position will receive two equal-sized, opposite-phase sound waves. According to the dipole superposition effect, the sound waves at this fixed position can cancel each other out to the greatest extent, greatly improving the sound leakage problem of the sound-generating device 100 during use, protecting user privacy, and improving user experience.

[0118] Optionally, the first and third sound waves are in phase, and the second and fourth sound waves are in phase. In one embodiment, the first diaphragm assembly 31 and the second diaphragm assembly 41 radiate sound waves of the same phase to the outside through the first sound outlet channel after passing through the first cavity 151 and the third cavity 153, and radiate sound waves of the same phase to the outside through the second sound outlet channel after passing through the second cavity 152 and the fourth cavity 154.

[0119] In this embodiment, by connecting the first sound outlet channel to both the first cavity 151 and the third cavity 153, the first and third sound waves radiate outward through the first sound outlet channel. Since the first and third sound waves are in phase, sound wave superposition is achieved, increasing loudness. Simultaneously, by connecting the second sound outlet channel (i.e., the venting channel) to both the second cavity 152 and the fourth cavity 154, venting of the second cavity 152 and the fourth cavity 154 is achieved, ensuring the vibration performance of the first diaphragm assembly 31 and the second diaphragm assembly 41.

[0120] Alternatively, the second sound outlet channel can be connected to both the second cavity 152 and the fourth cavity 154. When both the second and fourth sound waves radiate outward through the second sound outlet channel, their phases are the same, resulting in sound wave superposition and increased loudness. Since the first and second sound waves are out of phase, and the third and fourth sound waves are out of phase, when the sound waves radiate outward from the two sound outlet channels, from a fixed position at a greater distance in the environment, the positions of the two sound waves are relatively close. It can be assumed that the fixed position is approximately equidistant from the two sound waves, causing them to generate two equal-sized, opposite-phase sound fields. Therefore, the fixed position will receive two equal-sized, opposite-phase sound waves. According to the dipole superposition effect, the sound waves at this fixed position can cancel each other out to the greatest extent, greatly improving the sound leakage problem of the sound-generating device 100 during use, protecting user privacy, and improving user experience.

[0121] In one embodiment, the first voice coil 32 includes a first sub-voice coil 321 and a second sub-voice coil 322 disposed on opposite sides of the first diaphragm assembly 31. The side of the first sub-voice coil 321 facing away from the first diaphragm assembly 31 is correspondingly disposed with the first magnetic gap 223, and the side of the second sub-voice coil 322 facing away from the first diaphragm assembly 31 is correspondingly disposed with the first auxiliary magnetic gap 53.

[0122] In this embodiment, the first voice coil 321 and the second voice coil 322 are each wound with independent wires. The first diaphragm assembly 31 may include a first diaphragm 311 and a first diaphragm plate 312 connected to the inner side of the first diaphragm 311. The first voice coil 321 and the second voice coil 322 are respectively disposed on opposite sides of the first diaphragm plate 312. It can be understood that by setting the first voice coil 32 as a separate structure, the first diaphragm plate 312 can be formed as a single structure and connected to the first voice coil 321 and the second voice coil 322 respectively, thus making the structural design of the first diaphragm plate 312 simpler and the assembly simpler.

[0123] Of course, in other embodiments, such as Figure 5 , Figure 6As shown, the first voice coil 32 can also be configured as a one-piece molded structure, that is, the first voice coil 32 is a one-piece wound structure and extends along the first direction, so that the two ends of the first voice coil 32 are respectively set to correspond to the first auxiliary magnetic gap 53 and the first magnetic gap 223, thereby simplifying the structural design of the sound generating device 100 and improving assembly efficiency. It is understood that the first voice coil 32 is set through the first diaphragm assembly 31, which is not limited here.

[0124] In one embodiment, the first voice coil 32 is an integrally wound structure and extends along a first direction. The first voice coil 32 has a height along the first direction. The height of the first voice coil 32 is greater than the thickness of the first voice coil 32. The thickness of the first voice coil 32 is less than the width of the first magnetic gap 223 and the first auxiliary magnetic gap 53.

[0125] In this embodiment, as Figure 5 , Figure 6 As shown, the first voice coil 32 is an integral voice coil extending along a first direction, formed by winding the same wire. The first voice coil 32 has a height along the first direction. Optionally, the height of the first voice coil 32 is greater than the thickness of the first voice coil 32. It should be noted that the thickness of the first voice coil 32 is the distance between the inner and outer wall surfaces of the annular voice coil.

[0126] Understandably, since the height of the first voice coil 32 is greater than its thickness, it is less affected by changes in the magnetic field during vibration, especially when the vibration amplitude is relatively large. The BL(x) curve is significantly flatter, which significantly reduces the distortion of the sound-generating device 100 and improves the sound quality.

[0127] In this embodiment, the two ends of the first voice coil 32 are respectively opposite to the first auxiliary magnetic gap 53 and the first magnetic gap 223, and the thickness of the first voice coil 32 is less than the width of the first auxiliary magnetic gap 53 and the first magnetic gap 223. During vibration, the two ends of the first voice coil 32 extend into the first auxiliary magnetic gap 53 and the first magnetic gap 223, respectively. The first auxiliary magnetic gap 53 and the first magnetic gap 223 respectively provide a clearance for the ends of their respective first voice coils 32, which can ensure the vibration amplitude of the first voice coil 32 when the thickness of the sound generating device 100 is constant; or, when the vibration amplitude of the first voice coil 32 is constant, the thickness of the sound generating device 100 can be reduced to facilitate a thinner design.

[0128] In one embodiment, the second voice coil 42 includes a third sub-voice coil 421 and a fourth sub-voice coil 422 disposed on opposite sides of the second diaphragm assembly 41. The side of the third sub-voice coil 421 facing away from the second diaphragm assembly 41 is correspondingly disposed with the second magnetic gap 224, and the side of the fourth sub-voice coil 422 facing away from the second diaphragm assembly 41 is correspondingly disposed with the second auxiliary magnetic gap 63.

[0129] In this embodiment, the third voice coil 421 and the fourth voice coil 422 are each wound with independent wires. The second diaphragm assembly 41 may include a second diaphragm 411 and a second diaphragm plate 412 connected to the inner side of the second diaphragm 411. The third voice coil 421 and the fourth voice coil 422 are respectively disposed on opposite sides of the second diaphragm plate 412. It can be understood that by setting the second voice coil 42 as a separate structure, the second diaphragm plate 412 can be formed as a single structure and connected to the third voice coil 421 and the fourth voice coil 422 respectively, thus making the structural design of the second diaphragm plate 412 simpler and the assembly simpler.

[0130] Of course, in other embodiments, such as Figure 5 , Figure 6 As shown, the second voice coil 42 can also be configured as a one-piece molded structure, that is, the second voice coil 42 is a one-piece wound structure and extends along the first direction, so that the two ends of the second voice coil 42 are respectively set to correspond to the second magnetic gap 224 and the second auxiliary magnetic gap 63, thereby simplifying the structural design of the sound generating device 100 and improving assembly efficiency. It is understood that the second voice coil 42 is set through the second diaphragm assembly 41, which is not limited here.

[0131] In one embodiment, the second voice coil 42 is an integrally wound structure and extends along a first direction. The second voice coil 42 has a height along the first direction. The height of the second voice coil 42 is greater than the thickness of the second voice coil 42. The thickness of the second voice coil 42 is less than the width of the second magnetic gap 224 and the second auxiliary magnetic gap 63.

[0132] In this embodiment, as Figure 5 , Figure 6 As shown, the second voice coil 42 is formed by winding the same wire to create an integral voice coil extending along the first direction, and the second voice coil 42 has a height along the first direction. Optionally, the height of the second voice coil 42 is greater than the thickness of the second voice coil 42. It should be noted that the thickness of the second voice coil 42 is the distance between the inner and outer wall surfaces of the annular voice coil.

[0133] Understandably, since the height of the second voice coil 42 is greater than its thickness, it is less affected by changes in the magnetic field during vibration, especially when the vibration amplitude is relatively large. The BL(x) curve is significantly flatter, which significantly reduces the distortion of the sound-generating device 100 and improves the sound quality.

[0134] In this embodiment, the two ends of the second voice coil 42 are respectively opposite to the second magnetic gap 224 and the second auxiliary magnetic gap 63, and the thickness of the second voice coil 42 is less than the width of the second magnetic gap 224 and the second auxiliary magnetic gap 63. During vibration, the two ends of the second voice coil 42 extend into the second magnetic gap 224 and the second auxiliary magnetic gap 63, respectively. The second magnetic gap 224 and the second auxiliary magnetic gap 63 respectively provide clearance for the ends of their respective second voice coils 42, which can ensure the vibration amplitude of the second voice coil 42 when the thickness of the sound generating device 100 is constant; or, when the vibration amplitude of the second voice coil 42 is constant, the thickness of the sound generating device 100 can be reduced to facilitate a thinner design.

[0135] In one embodiment, the first diaphragm assembly 31 includes a first diaphragm 311 and a first resonant plate 312 connected to the inner side of the first diaphragm 311, and a first voice coil 32 connected to the first resonant plate 312. Optionally, the inner side of the first diaphragm 311 is bonded to the outer periphery of the first resonant plate 312.

[0136] In this embodiment, as Figure 5 , Figure 6 and Figure 10 As shown, the first diaphragm 311 includes a first folded ring 3111, a first outer connecting portion disposed on the outer side of the first folded ring 3111, and a first inner connecting portion disposed on the inner side of the first folded ring 3111. The first outer connecting portion of the first diaphragm 311 can be connected to a structure such as a shell or housing, and the first inner connecting portion of the first diaphragm 311 is connected to the first vibrating plate 312. It should be noted that the first folded ring 3111 of the first diaphragm 311 can be an upwardly convex bulge structure or a downwardly concave bulge structure.

[0137] Understandably, the first diaphragm assembly 31's first vibrating plate 312 can be an integrally molded structure. In this case, the first voice coil 32 can be a separate structure, meaning that the first sub-voice coil 321 and the second sub-voice coil 322 of the first voice coil 32 are respectively located on opposite sides of the first diaphragm assembly 312. This arrangement ensures both the structural strength of the first diaphragm assembly 312 and the connection stability between the first sub-voice coil 321 and the second sub-voice coil 322 and the first diaphragm assembly 312.

[0138] Of course, in other embodiments, such as Figure 5 , Figure 6 and Figure 10 As shown, the first diaphragm 312 includes a first inner diaphragm 3121 connected to the inner wall of the first voice coil 32 and a first outer diaphragm 3122 connected to the outer wall of the first voice coil 32. The first outer diaphragm 3122 is connected to the first diaphragm 311.

[0139] In this embodiment, by setting the first diaphragm 312 as a split structure, the first voice coil 32 can be selected as an integrally formed structure. This simplifies the electrical connection structure with the first voice coil 32. The first voice coil 32 has a lead wire on one side, and an electrical connector is only provided on one side of the first voice coil 32.

[0140] In one embodiment, the second diaphragm assembly 41 includes a second diaphragm 411 and a second diaphragm plate 412 connected to the inner side of the second diaphragm 411, and a second voice coil 42 connected to the second diaphragm plate 412. Optionally, the inner side of the second diaphragm 411 is bonded to the outer periphery of the second diaphragm plate 412.

[0141] In this embodiment, as Figure 5 , Figure 6 and Figure 10 As shown, the second diaphragm 411 includes a second folded ring 4111, a second outer connecting portion disposed on the outer side of the second folded ring 4111, and a second inner connecting portion disposed on the inner side of the second folded ring 4111. The second outer connecting portion of the second diaphragm 411 can be connected to a structure such as a shell or housing, and the second inner connecting portion of the second diaphragm 411 is connected to the second vibrating plate 412. It should be noted that the second folded ring 4111 of the second diaphragm 411 can be an upwardly convex bulge structure or a downwardly concave bulge structure.

[0142] Understandably, the second diaphragm assembly 41's second diaphragm plate 412 can be an integrally molded structure. In this case, the second voice coil 42 can be a separate structure, meaning that the third voice coil 421 and the fourth voice coil 422 of the second voice coil 42 are respectively located on opposite sides of the second diaphragm plate 412. This arrangement ensures both the structural strength of the second diaphragm plate 412 and the connection stability of the third voice coil 421 and the fourth voice coil 422 with the second diaphragm plate 412.

[0143] Of course, in other embodiments, such as Figure 5 , Figure 6 and Figure 10 As shown, the second diaphragm 412 includes a second inner diaphragm 4121 connected to the inner wall of the second voice coil 42 and a second outer diaphragm 4122 connected to the outer wall of the second voice coil 42. The second outer diaphragm 4122 is connected to the second diaphragm 411.

[0144] In this embodiment, by setting the second diaphragm 412 as a split structure, the second voice coil 42 can be selected as an integrally formed structure. This simplifies the electrical connection structure of the second voice coil 42. The second voice coil 42 has a lead wire on one side, and the electrical connector is only set on one side of the second voice coil 42.

[0145] In one embodiment, the first vibration system 3 further includes a first centering support 33, which includes a first outer fixing part 331, a first inner fixing part 332, and a first spring arm part 333 connecting the first outer fixing part 331 and the first inner fixing part 332. The first outer fixing part 331 is connected to the outer shell 1, and the first inner fixing part 332 is connected to the end of the first voice coil 32 facing the first auxiliary magnet assembly 5.

[0146] In this embodiment, as Figure 5 As shown, the first centering support 33 is located on the side of the first voice coil 32 facing away from the magnetic circuit system 2, and is connected to the outer shell 1 and the first voice coil 32 respectively. In this way, the first centering support 33 can be used to center the first voice coil 32, avoid the first voice coil 32 from being polarized or oscillating during vibration, and improve the operational stability of the first vibration system 3.

[0147] In one implementation, such as Figure 5 , Figure 6 and Figure 9 As shown, there are two first auxiliary side magnets 52, which are symmetrically arranged on opposite sides of the first auxiliary center magnet 51 along a third direction. Optionally, there are two first centering supports 33, which are respectively arranged at both ends of the first auxiliary side magnet 52 and the first auxiliary center magnet 51 along a second direction, which is not limited here.

[0148] In one embodiment, the second vibration system 4 further includes a second centering support 43, which includes a second outer fixing part 431, a second inner fixing part 432, and a second spring arm part 433 connecting the second outer fixing part 431 and the second inner fixing part 432. The second outer fixing part 431 is connected to the outer shell 1, and the second inner fixing part 432 is connected to one end of the second voice coil 42 facing the second auxiliary magnet assembly 6.

[0149] In this embodiment, as Figure 5 As shown, the second centering support 43 is located on the side of the second voice coil 42 facing away from the magnetic circuit system 2, and is connected to the outer casing 1 and the second voice coil 42 respectively. In this way, the second centering support 43 can be used to center the second voice coil 42, preventing the second voice coil 42 from being polarized or oscillating during vibration, and improving the operational stability of the second vibration system 4.

[0150] In one implementation, such as Figure 5 , Figure 6 and Figure 9As shown, there are two second auxiliary side magnets 62, which are symmetrically arranged on opposite sides of the second auxiliary center magnet 61 along a third direction. Optionally, there are two second centering supports 43, which are respectively arranged at both ends of the second auxiliary side magnet 62 and the second auxiliary center magnet 61 along a second direction.

[0151] Understandably, when the sound-generating device 100 is applied to an electronic device, the external shape of the electronic device can be either a regular or irregular structure. The external shape of the sound-generating device 100 is influenced and limited by the external shape of the electronic device's housing, and will change accordingly. When the external shape of the electronic device's housing is irregular, the external shape of the sound-generating device 100 will also be irregular.

[0152] In one embodiment, the housing 1 of the sound-generating device 100 forms a clearance structure to avoid irregular structures of the device housing. It is understood that the magnetic circuit system 2, the first vibration system 3, and the second vibration system 4 of the sound-generating device 100 are asymmetrically or irregularly arranged in relation to the clearance structure.

[0153] It should be noted that the regular or symmetrical structure of the sound-generating device 100 means that both sides of the outer shell 1 are symmetrically arranged along the central axis of either the major or minor axis, such as a regular polygonal structure like a circle, ellipse, or square. The irregular or asymmetrical structure of the sound-generating device 100 means that at least one side of the outer shell 1 is asymmetrically arranged along the central axis of either the major or minor axis, such as... Figure 1 and Figure 2 As shown, no limitations are specified here.

[0154] Optionally, the sound-generating device 100 forms a clearance structure. In one embodiment, the housing 1 has a first clearance portion 14. It is understood that the first clearance portion 14 may be a chamfered angle or an arcuate surface to facilitate clearance from irregular structures of the device housing. In this embodiment, the first housing 11, the middle housing 13, and the second housing 12 of the housing 1 all have the first clearance portion 14.

[0155] In this embodiment, the magnetic circuit system 2, the first vibration system 3, and the second vibration system 4 of the sound-generating device 100 are all provided with clearance structures corresponding to the first clearance portion 14. Optionally, the first diaphragm assembly 31 of the first vibration system 3 is provided with a second clearance portion 34 corresponding to the first clearance portion 14, so that the first diaphragm assembly 31 is formed into an asymmetrical structure, and the second diaphragm assembly 41 of the second vibration system 4 is provided with a third clearance portion 44 corresponding to the first clearance portion 14, so that the second diaphragm assembly 41 is formed into an asymmetrical structure. Optionally, the first clearance portion 14, the second clearance portion 34, and the third clearance portion 44 are all provided with chamfered angles or arc-shaped curved surfaces.

[0156] Understandably, by setting the first diaphragm assembly 31 to an asymmetrical structure, the first diaphragm assembly 31 can fully utilize the unused space of the entire device, forming a larger Sd using its asymmetrical structure, thereby further increasing the radiation area of ​​the first diaphragm assembly 31 and improving the performance of the sound-generating device 100. Simultaneously, by setting the second diaphragm assembly 41 to an asymmetrical structure, the second diaphragm assembly 41 can also fully utilize the unused space of the entire device, forming a larger Sd using its asymmetrical structure, further increasing the radiation area of ​​the second diaphragm assembly 41 and improving the performance of the sound-generating device 100. Moreover, the fit between the sound-generating device 100 and the entire device is more compact, saving assembly space.

[0157] The present invention also proposes an electronic device including the aforementioned sound-generating device 100. The specific structure of the sound-generating device 100 is as described in the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be described in detail here.

[0158] In one embodiment, the electronic device further includes a device housing, and the sound-emitting device 100 is disposed within the device housing. In this embodiment, as... Figure 4 , Figure 6 As shown, the first diaphragm assembly 31 of the sound-generating device 100 forms a first cavity 151 between the side of the first diaphragm assembly 31 facing away from the magnetic circuit system 2 and the outer shell 1; the first diaphragm assembly 31 forms a second cavity 152 between the first diaphragm assembly 31 and the magnetic circuit system 2; the second diaphragm assembly 41 of the sound-generating device 100 forms a third cavity 153 between the second diaphragm assembly 41 facing away from the magnetic circuit system 2 and the outer shell 1; and the second diaphragm assembly 41 forms a fourth cavity 154 between the side of the second diaphragm assembly 41 facing away from the magnetic circuit system 2 and the outer shell 1.

[0159] Understandably, a first cavity 151 is formed between the first diaphragm assembly 31 and the first housing 11, a second cavity 152 is formed between the first diaphragm assembly 31 and the magnetic circuit system 2, a third cavity 153 is formed between the second diaphragm assembly 41 and the magnetic circuit system 2, and a fourth cavity 154 is formed between the second diaphragm assembly 41 and the second housing 12.

[0160] Optionally, the first diaphragm assembly 31 and the second diaphragm assembly 41 radiate sound waves of the same phase to the outside through the first sound outlet channel after passing through the second cavity 152 and the third cavity 153, and radiate sound waves of the same phase to the outside through the second sound outlet channel after passing through the first cavity 151 and the fourth cavity 154. In this embodiment, the first sound outlet channel includes a sound outlet provided on the device housing, and the second sound outlet channel includes a vent provided on the device housing.

[0161] Understandably, electronic devices can emit sound through a sound outlet and vent through a vent. When both the sound outlet and vent of an electronic device radiate sound waves outwards, from a fixed position at a relatively far distance in the environment, the two sound waves are relatively close. It can be assumed that the fixed position is approximately equidistant from the two sound waves, causing them to generate two sound fields of equal size and opposite phase. Therefore, the fixed position will receive two sound waves of equal size and opposite phase. According to the superposition effect of dipoles, the sound waves at this fixed position can cancel each other out to the greatest extent, greatly improving the sound leakage problem of electronic devices during use, protecting user privacy, and enhancing the user experience.

[0162] Optionally, the first diaphragm assembly 31 and the second diaphragm assembly 41 radiate sound waves of the same phase to the outside through the first sound outlet channel after passing through the first cavity 151 and the third cavity 153, and radiate sound waves of the same phase to the outside through the second sound outlet channel after passing through the second cavity 152 and the fourth cavity 154. In this embodiment, the first sound outlet channel includes a sound outlet provided on the device housing, and the second sound outlet channel includes a vent provided on the device housing.

[0163] Understandably, electronic devices can emit sound through a sound outlet and vent through a vent. When both the sound outlet and vent of an electronic device radiate sound waves outwards, from a fixed position at a relatively far distance in the environment, the two sound waves are relatively close. It can be assumed that the fixed position is approximately equidistant from the two sound waves, causing them to generate two sound fields of equal size and opposite phase. Therefore, the fixed position will receive two sound waves of equal size and opposite phase. According to the superposition effect of dipoles, the sound waves at this fixed position can cancel each other out to the greatest extent, greatly improving the sound leakage problem of electronic devices during use, protecting user privacy, and enhancing the user experience.

[0164] It should be noted that the sound-generating device 100 is located inside the equipment housing. The equipment housing is provided with a sound outlet that is directly connected to the third sound outlet 133 and the fourth sound outlet 134. The equipment housing is also provided with a vent that is directly connected to the first sound outlet 111 and the second sound outlet 121. These are not limited here.

[0165] In another embodiment, the electronic device further includes a device housing with a mounting cavity. The sound-generating device 100 is disposed within the mounting cavity of the device housing, forming a spaced-apart front cavity and a rear cavity. To facilitate sound emission and venting, the device housing also has a sound outlet communicating with the front cavity and a vent communicating with the rear cavity.

[0166] In this embodiment, the third sound outlet 133 and the fourth sound outlet 134 of the sound-generating device 100 are connected to the front cavity, and the first sound outlet 111 and the second sound outlet 121 of the sound-generating device 100 are connected to the rear cavity. In this way, the electronic device can generate sound through the sound outlet and release air through the vent. The sound waves radiated outward from the sound outlet and the vent are used so that, from a fixed position at a relatively far distance in the environment, since the positions of the two sound waves are relatively close, it can be considered that the fixed position is approximately equidistant from the two sound waves. This causes the two sound waves to generate two sound fields of equal size and opposite phase. Therefore, the fixed position will receive two sound waves of equal size and opposite phase. According to the superposition effect of dipoles, the sound waves at the fixed position can cancel each other out to the greatest extent, which greatly improves the sound leakage problem of the electronic device during use, protects the user's privacy, and improves the user experience.

[0167] It is understood that electronic devices can be mobile phones, headphones, smart wearable devices, etc., and are not limited here. Smart wearable devices can be smart glasses or AR / VR / MR glasses, etc., and are not limited here. This embodiment uses smart glasses as an example for illustration.

[0168] In this embodiment, the smart glasses include a frame and temples. The temples are provided with a mounting cavity, and the sound-generating device 100 is disposed in the mounting cavity. The temples have recessed grooves for accommodating the ears, so that the inner wall of the mounting cavity forms a protrusion corresponding to the recessed groove. The first clearance portion 14 of the sound-generating device 100 corresponds to the protrusion to avoid the protrusion.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: shell; A magnetic circuit system is disposed on the outer shell. The magnetic circuit system includes a support plate and a magnet assembly. The support plate has a central mounting hole and a side mounting hole arranged at intervals. The magnet assembly includes a central magnetic part and a side magnetic part disposed outside the central magnetic part. The central magnetic part includes a first central magnetic part and a second central magnetic part stacked along a first direction. A portion of the first central magnetic part and a portion of the second central magnetic part are embedded in the central mounting hole and connected to each other. The side magnetic part includes a first side magnetic part and a second side magnetic part stacked along the first direction. A portion of the first side magnetic part and a portion of the second side magnetic part are embedded in the side mounting hole and connected to each other. The first side magnetic part and the first central magnetic part are spaced apart to form a first magnetic gap, and the second side magnetic part and the second central magnetic part are spaced apart to form a second magnetic gap. A first vibration system is disposed in the housing and located on one side of the magnetic circuit system. The first vibration system includes a first diaphragm assembly and a first voice coil connected to the first diaphragm assembly. The first voice coil is correspondingly disposed with respect to the first magnetic gap. The second vibration system is disposed in the housing and located on the other side of the magnetic circuit system. The second vibration system includes a second diaphragm assembly and a second voice coil connected to the second diaphragm assembly. The second voice coil is correspondingly disposed with the second magnetic gap. Both the first vibration system and the second vibration system vibrate along the first direction. Wherein, the first central magnetic part and the second central magnetic part are bonded together; and / or, the first side magnetic part and the second side magnetic part are bonded together.

2. The sound-generating device as described in claim 1, characterized in that, A first groove is provided on the periphery of the connection between the first central magnetic part and the second central magnetic part, corresponding to the support plate. The portion of the support plate adjacent to the central mounting hole is accommodated in the first groove and is fitted with the groove wall of the first groove. The wall of the central mounting hole is fitted with the groove wall of the first groove. Alternatively, a second groove is provided at the periphery of the connection between the first side magnetic part and the second side magnetic part, corresponding to the support plate. The portion of the support plate adjacent to the side mounting hole is accommodated in the second groove and is fitted against the groove wall of the second groove. The hole wall of the side mounting hole is fitted against the groove wall of the first groove.

3. The sound-generating device as described in claim 1, characterized in that, The first central magnetic part and the second central magnetic part are arranged symmetrically with respect to the support plate; And / or, the first side magnetic portion and the second side magnetic portion are arranged symmetrically with respect to the support plate; And / or, the first vibration system and the second vibration system are arranged symmetrically with respect to the support plate; And / or, the side magnetic part includes two, both of which and the central magnetic part extend along the second direction, and the two side magnetic parts are symmetrically arranged on opposite sides of the central magnetic part along the third direction; wherein, the first direction, the second direction and the third direction are arranged perpendicularly to each other; And / or, the first voice coil is an integrally wound structure and extends along the first direction, the first voice coil has a height along the first direction, the height of the first voice coil is greater than the thickness of the first voice coil, and the thickness of the first voice coil is less than the width of the first magnetic gap. And / or, the second voice coil is an integrally wound structure and extends along the first direction, the second voice coil has a height along the first direction, the height of the second voice coil is greater than the thickness of the second voice coil, and the thickness of the second voice coil is less than the width of the second magnetic gap; And / or, the support plate is made of a magnetically conductive material or a non-magnetically conductive material.

4. The sound-generating device as described in claim 1, characterized in that, The first central magnetic part includes a first central magnet and a first central magnetic plate stacked on the first central magnet; the second central magnetic part includes a second central magnet and a second central magnetic plate stacked on the second central magnet; a portion of the first central magnet and a portion of the second central magnet are embedded in the central mounting hole and connected to each other. The first side magnetic part includes a first side magnet and a first side magnetic plate stacked on the first side magnet; the second side magnetic part includes a second side magnet and a second side magnetic plate stacked on the second side magnet; a portion of the first side magnet and a portion of the second side magnet are embedded in the side mounting hole and connected to each other. The first central magnet and the second central magnet are bonded together, and the first side magnet and the second side magnet are bonded together.

5. The sound-generating device as described in claim 4, characterized in that, Both the first central magnet and the second central magnet are magnetized along the first direction and in the same direction. Both the first side magnet and the second side magnet are magnetized along the first direction and in the same direction. The magnetization directions of the first central magnet and the first side magnet are opposite, and the magnetization directions of the second central magnet and the second side magnet are opposite. And / or, the first central magnet and the second central magnet are symmetrically arranged with respect to the support plate, and the first central magnetic plate and the second central magnetic plate are symmetrically arranged with respect to the support plate; And / or, the first side magnet and the second side magnet are symmetrically arranged with respect to the support plate, and the first side magnetic plate and the second side magnetic plate are symmetrically arranged with respect to the support plate.

6. The sound-generating device as claimed in claim 1, characterized in that, The sound-generating device further includes: A first auxiliary magnet assembly is disposed within the housing and located on the side of the first vibration system facing away from the magnetic circuit system. The first auxiliary magnet assembly has a first auxiliary magnetic gap. A first dense region of magnetic field lines accommodating the first voice coil is formed between the first auxiliary magnet assembly and the magnetic circuit system. One end of the first voice coil is correspondingly positioned to the first magnetic gap, and the other end of the first voice coil is correspondingly positioned to the first auxiliary magnetic gap. The second auxiliary magnet assembly is disposed inside the housing and located on the side of the second vibration system facing away from the magnetic circuit system. The second auxiliary magnet assembly has a second auxiliary magnetic gap. A second magnetic field line dense area is formed between the second auxiliary magnet assembly and the magnetic circuit system to accommodate the second voice coil. One end of the second voice coil is correspondingly disposed with the second magnetic gap, and the other end of the second voice coil is correspondingly disposed with the second auxiliary magnetic gap.

7. The sound-generating device as described in claim 6, characterized in that, The first central magnetic part includes a first central magnet, and the second central magnetic part includes a second central magnet. A portion of the first central magnet and a portion of the second central magnet are embedded in the central mounting hole and connected to each other. The first side magnetic part includes a first side magnet, and the second side magnetic part includes a second side magnet. A portion of the first side magnet and a portion of the second side magnet are embedded in the side mounting hole and connected to each other. The first central magnet and the first side magnet are both exposed in the internal cavity of the sound-generating device on the side facing the first diaphragm assembly, and the second central magnet and the second side magnet are both exposed in the internal cavity of the sound-generating device on the side facing the second diaphragm assembly. The first central magnet and the second central magnet are bonded together, and the first side magnet and the second side magnet are bonded together.

8. The sound-generating device as claimed in claim 7, characterized in that, The first auxiliary magnet assembly includes a first auxiliary central magnet opposite to the first central magnet and a first auxiliary side magnet opposite to the first side magnet. The first auxiliary side magnet is disposed outside the first auxiliary central magnet and spaced apart from the first auxiliary central magnet to form the first auxiliary magnetic gap. The sides of the first auxiliary central magnet and the first auxiliary side magnet facing the first diaphragm assembly are both exposed in the internal cavity of the sound-generating device. The second auxiliary magnet assembly includes a second auxiliary central magnet opposite to the second central magnet and a second auxiliary side magnet opposite to the second side magnet. The second auxiliary side magnet is disposed outside the second auxiliary central magnet and spaced apart from the second auxiliary central magnet to form the second auxiliary magnetic gap. The sides of the second auxiliary central magnet and the second auxiliary side magnet facing the second diaphragm assembly are both exposed in the internal cavity of the sound-generating device.

9. The sound-generating device as described in claim 8, characterized in that, The distance between the end face of the first voice coil facing the first central magnet and the first central magnet is the same as the distance between the end face of the first voice coil facing the first auxiliary central magnet and the first auxiliary central magnet. And / or, the distance between the end face of the second voice coil facing the second central magnet and the second central magnet is the same as the distance between the end face of the second voice coil facing the second auxiliary central magnet and the second auxiliary central magnet; And / or, the first auxiliary center magnet and the second auxiliary center magnet are symmetrically arranged with respect to the support plate, and the first auxiliary side magnet and the second auxiliary side magnet are symmetrically arranged with respect to the support plate.

10. The sound-generating device as claimed in claim 8, characterized in that, Both the first central magnet and the second central magnet are magnetized along the first direction and in the same direction. Both the first side magnet and the second side magnet are magnetized along the first direction and in the same direction. The magnetization direction of the first central magnet and the second central magnet is opposite to that of the first side magnet and the second side magnet. Both the first auxiliary central magnet and the first auxiliary side magnet are magnetized along the first direction and in opposite directions. Both the second auxiliary central magnet and the second auxiliary side magnet are magnetized along the first direction and in opposite directions. The magnetization direction of the first central magnet and the second central magnet is opposite to that of the first auxiliary central magnet and the second auxiliary central magnet. The magnetization direction of the first side magnet and the second side magnet is opposite to that of the first auxiliary side magnet and the second auxiliary side magnet. And / or, the first side magnet includes two, both of which extend along the second direction, and the two first side magnets are symmetrically arranged on opposite sides of the first central magnet along the third direction; the second side magnet includes two, both of which extend along the second direction, and the two second side magnets are symmetrically arranged on opposite sides of the second central magnet along the third direction; the first auxiliary side magnet includes two, both of which extend along the second direction, and the two first auxiliary side magnets are symmetrically arranged on opposite sides of the first auxiliary central magnet along the third direction; the second auxiliary side magnet includes two, both of which extend along the second direction, and the two second auxiliary side magnets are symmetrically arranged on opposite sides of the second auxiliary central magnet along the third direction; wherein, the first direction, the second direction, and the third direction are arranged perpendicularly to each other; And / or, the first voice coil is an integrally wound structure and extends along the first direction, the first voice coil has a height along the first direction, the height of the first voice coil is greater than the thickness of the first voice coil, and the thickness of the first voice coil is less than the width of the first magnetic gap and the first auxiliary magnetic gap. And / or, the second voice coil is an integrally wound structure and extends along the first direction, the second voice coil has a height along the first direction, the height of the second voice coil is greater than the thickness of the second voice coil, and the thickness of the second voice coil is less than the width of the second magnetic gap and the second auxiliary magnetic gap.

11. The sound-generating device as claimed in claim 6, characterized in that, The outer casing includes a first housing, a second housing, and a middle housing located between the first housing and the second housing. The periphery of the first diaphragm assembly is sandwiched between the first housing and the middle housing, the periphery of the second diaphragm assembly is sandwiched between the second housing and the middle housing, the periphery of the support plate is connected to the middle housing, the first auxiliary magnet assembly is located on the side of the first housing facing the first diaphragm assembly, and the second auxiliary magnet assembly is located on the side of the second housing facing the second diaphragm assembly. Wherein, the middle shell includes a first middle shell and a second middle shell extending along the first direction, and the periphery of the support plate is sandwiched between the first middle shell and the second middle shell; and / or, the first diaphragm assembly includes a first folded ring extending recessed toward the magnetic circuit system, and the inner wall of the middle shell is spaced from the first side magnetic portion to form a first clearance gap to avoid the first folded ring; and / or, the second diaphragm assembly includes a second folded ring extending recessed toward the magnetic circuit system, and the inner wall of the middle shell is spaced from the second side magnetic portion to form a second clearance gap to avoid the second folded ring.

12. The sound-generating device as claimed in claim 11, characterized in that, A first cavity is formed between the first diaphragm assembly and the first housing; a second cavity is formed between the first diaphragm assembly and the magnetic circuit system; a third cavity is formed between the second diaphragm assembly and the magnetic circuit system; and a fourth cavity is formed between the second diaphragm assembly and the second housing. The first housing is provided with a first sound outlet hole communicating with the first cavity, the second housing is provided with a second sound outlet hole communicating with the fourth cavity, the middle housing is provided with a third sound outlet hole communicating with the second cavity, and the middle housing is provided with a fourth sound outlet hole communicating with the third cavity; Wherein, the first diaphragm assembly radiates a first sound wave to the first cavity, and the first diaphragm assembly radiates a second sound wave to the second cavity, the first sound wave and the second sound wave being out of phase; the second diaphragm assembly radiates a third sound wave to the third cavity, and the second diaphragm assembly radiates a fourth sound wave to the fourth cavity, the third sound wave and the fourth sound wave being out of phase; The second sound wave and the third sound wave are in phase, and the first sound wave and the fourth sound wave are in phase; or, the first sound wave and the third sound wave are in phase, and the second sound wave and the fourth sound wave are in phase. And / or, the first housing has a first portion connected to the first auxiliary magnet assembly, and the second housing has a second portion connected to the second auxiliary magnet assembly, both the first portion and the second portion being made of a magnetically conductive material.

13. The sound-generating device as claimed in claim 6, characterized in that, The first voice coil includes a first sub-voice coil and a second sub-voice coil disposed on opposite sides of the first diaphragm assembly. The side of the first sub-voice coil facing away from the first diaphragm assembly is disposed corresponding to the first magnetic gap, and the side of the second sub-voice coil facing away from the first diaphragm assembly is disposed corresponding to the first auxiliary magnetic gap. And / or, the second voice coil includes a third voice coil and a fourth voice coil disposed on opposite sides of the second diaphragm assembly, wherein the side of the third voice coil facing away from the second diaphragm assembly is disposed corresponding to the second magnetic gap, and the side of the fourth voice coil facing away from the second diaphragm assembly is disposed corresponding to the second auxiliary magnetic gap; And / or, the first diaphragm assembly includes a first diaphragm and a first diaphragm plate connected to the inner side of the first diaphragm; wherein, the first diaphragm plate is an integrally formed structure; or, the first diaphragm plate includes a first inner diaphragm plate connected to the inner wall of the first voice coil and a first outer diaphragm plate connected to the outer wall of the first voice coil, wherein the first outer diaphragm plate is connected to the first diaphragm. And / or, the second diaphragm assembly includes a second diaphragm and a second diaphragm plate connected to the inner side of the second diaphragm; wherein the second diaphragm plate is an integrally formed structure; or, the second diaphragm plate includes a second inner diaphragm plate connected to the inner wall of the second voice coil and a second outer diaphragm plate connected to the outer wall of the second voice coil, wherein the second outer diaphragm plate is connected to the second diaphragm. Alternatively, the first vibration system further includes a first centering support, which includes a first outer fixing part, a first inner fixing part, and a first elastic arm connecting the first outer fixing part and the first inner fixing part. The first outer fixing part is connected to the outer shell, and the first inner fixing part is connected to the end of the first voice coil facing the first auxiliary magnet assembly. The second vibration system further includes a second centering support, which includes a second outer fixing part, a second inner fixing part, and a second elastic arm connecting the second outer fixing part and the second inner fixing part. The second outer fixing part is connected to the outer shell, and the second inner fixing part is connected to the end of the second voice coil facing the second auxiliary magnet assembly.

14. The sound-generating device as claimed in claim 1, characterized in that, The outer shell includes a first shell, a second shell, and a middle shell located between the first shell and the second shell. The periphery of the first diaphragm assembly is sandwiched between the first shell and the middle shell, the periphery of the second diaphragm assembly is sandwiched between the second shell and the middle shell, and the periphery of the support plate is connected to the middle shell. Wherein, the middle shell includes a first middle shell and a second middle shell extending along the first direction, and the periphery of the support plate is sandwiched between the first middle shell and the second middle shell; and / or, the first diaphragm assembly includes a first folded ring extending recessed toward the magnetic circuit system, and the inner wall of the middle shell is spaced from the first side magnetic portion to form a first clearance gap to avoid the first folded ring; and / or, the second diaphragm assembly includes a second folded ring extending recessed toward the magnetic circuit system, and the inner wall of the middle shell is spaced from the second side magnetic portion to form a second clearance gap to avoid the second folded ring.

15. The sound-generating device as claimed in claim 14, characterized in that, A first cavity is formed between the first diaphragm assembly and the first housing, and a second cavity is formed between the first diaphragm assembly and the magnetic circuit system; A third cavity is formed between the second diaphragm assembly and the magnetic circuit system, and a fourth cavity is formed between the second diaphragm assembly and the second housing; The first housing is provided with a first sound outlet hole communicating with the first cavity, the second housing is provided with a second sound outlet hole communicating with the fourth cavity, the middle housing is provided with a third sound outlet hole communicating with the second cavity, and the middle housing is provided with a fourth sound outlet hole communicating with the third cavity. And / or, the first diaphragm assembly and the second diaphragm assembly radiate sound waves of the same phase to the outside through the first sound outlet channel after passing through the second cavity and the third cavity, and radiate sound waves of the same phase to the outside through the second sound outlet channel after passing through the first cavity and the fourth cavity; or, the first diaphragm assembly and the second diaphragm assembly radiate sound waves of the same phase to the outside through the first sound outlet channel after passing through the first cavity and the third cavity, and radiate sound waves of the same phase to the outside through the second sound outlet channel after passing through the second cavity and the fourth cavity.

16. An electronic device, characterized in that, The electronic device includes a sound-generating device as described in any one of claims 1 to 15.

17. The electronic device as claimed in claim 16, characterized in that, The electronic device includes a device housing, and the sound-generating device is disposed within the device housing; the first diaphragm assembly of the sound-generating device forms a first cavity between the side facing away from the magnetic circuit system and the outer housing, the first diaphragm assembly forms a second cavity between the first diaphragm assembly and the magnetic circuit system, the second diaphragm assembly of the sound-generating device forms a third cavity between the second diaphragm assembly and the magnetic circuit system, and the side facing away from the magnetic circuit system of the second diaphragm assembly forms a fourth cavity between the second diaphragm assembly and the outer housing; Wherein, the first diaphragm assembly and the second diaphragm assembly radiate sound waves of the same phase to the outside through the first sound outlet channel after passing through the second cavity and the third cavity, and radiate sound waves of the same phase to the outside through the second sound outlet channel after passing through the first cavity and the fourth cavity; or, the first diaphragm assembly and the second diaphragm assembly radiate sound waves of the same phase to the outside through the first sound outlet channel after passing through the first cavity and the third cavity, and radiate sound waves of the same phase to the outside through the second sound outlet channel after passing through the second cavity and the fourth cavity. The first sound outlet channel includes a sound outlet provided on the device housing, and the second sound outlet channel includes a vent provided on the device housing.

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