Sound production device and electronic device

Abstract

This invention discloses a sound-generating device and an electronic device, relating to the field of electroacoustic transduction technology. The sound-generating device comprises a voice coil assembly of a vibration system, including multiple voice coils arranged in an array along an extension direction along a first side and a second side of a housing. A magnetic circuit system provides magnetic gaps corresponding to each voice coil. The diaphragm assembly includes a ring-shaped frame portion and an extension portion. The two ends of the extension portion are connected to the frame portion. The frame portion has a first folded ring and a first fixing portion connected to the outside of the first folded ring. The extension portion has a second fixing portion and a second folded ring surrounding the second fixing portion. The second fixing portion is connected to the magnetic circuit system. A perforated hole is provided on the vibrating plate corresponding to the second fixing portion and the second folded ring. This invention's sound-generating device not only achieves a thin and light design but also improves magnet utilization and increases the BL value, thereby enhancing loudness and sensitivity, and ultimately improving acoustic performance and user experience.

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] As the sound-generating unit of smart electronic products, high performance, high sound quality, and slim design are gradually becoming mainstream consumer demands. Especially with the development of headphones, the requirements for headphone speakers are getting higher and higher. In order to improve speaker performance, product design is becoming more and more extreme, and space utilization is also becoming more and more efficient.

[0003] In related technologies, loudspeakers typically use one or two voice coils, which often fall short of performance requirements in today's trend towards thinner and lighter designs. Therefore, there is an urgent need to develop a high-performance loudspeaker suitable for thinner and lighter applications to improve the user experience. 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 multi-voice coil sound-generating device that achieves a thinner and lighter design while improving magnet utilization and increasing the BL value to enhance loudness and sensitivity, thereby improving acoustic performance and user experience.

[0005] To achieve the above objectives, the present invention provides a sound-generating device, the sound-generating device comprising: The outer casing has a first side and a second side that are connected and set at an included angle; A vibration system, comprising a diaphragm assembly and a voice coil assembly connected to the diaphragm assembly, the voice coil assembly comprising a plurality of voice coils arranged in an array along an extension direction of a first side and an extension direction of a second side; and A magnetic circuit system is connected to the housing. The magnetic circuit system has a magnetic gap corresponding to each voice coil. The magnetic circuit system includes a magnetic yoke and a first central magnetic part, a second central magnetic part, and a first side magnetic part disposed on the magnetic yoke. The first central magnetic part includes a plurality of parts. Each first central magnetic part is located in a voice coil corresponding to it. The second central magnetic part is located between two adjacent voice coils arranged along the extension direction of the second side. The first side magnetic part is located on the outside of the voice coil assembly. The diaphragm assembly includes a diaphragm and a vibrating plate. The diaphragm includes a ring-shaped frame portion and an extension portion located inside the frame portion. Both ends of the extension portion are connected to the frame portion to form a hollow area between the extension portion and the frame portion. The frame portion is provided with a first folded ring and a first fixing portion connected to the outside of the first folded ring. The first fixing portion is connected to the outer shell. The extension portion is provided with a second fixing portion and a second folded ring surrounding the second fixing portion. The second fixing portion is connected to the first central magnet portion or the second central magnet portion. The vibrating plate is connected to the diaphragm to cover the hollow area, and the vibrating plate is provided with hollow holes corresponding to the second fixing portion and the second folded ring.

[0006] In one embodiment, the vibrating plate includes a first region connected to the diaphragm and a second region corresponding to the hollowed-out region, wherein the first region is a pressing edge structure; Wherein, the sum of the thickness of the first region along the vibration direction of the vibration system and the thickness of the diaphragm along the vibration direction of the vibration system is equal to the thickness of the second region along the vibration direction of the vibration system.

[0007] In one embodiment, the first central magnetic part includes a first central magnet, a first central magnetic plate, and a second central magnet stacked in sequence, and the first central magnet is connected to the magnetic yoke; The second central magnetic part includes a third central magnet and a second central magnetic plate stacked in sequence, wherein the third central magnet is connected to the magnetic yoke; The first side magnetic part includes a first side magnet and a first side magnetic plate stacked together, and the first side magnet is connected to the magnetic yoke; The first central magnet, the second central magnet, the third central magnet, and the first side magnet are all magnetized along the vibration direction of the vibration system, and the magnetization direction of the first central magnet is opposite to that of the second central magnet, the third central magnet, and the first side magnet. The extension portion is provided with a second fixing portion corresponding to each of the first central magnetic portions, and each of the second fixing portions is connected to a second central magnet. The vibrating plate is provided with a hollow hole corresponding to each of the first central magnetic portions.

[0008] In one embodiment, the first central magnetic part includes a first central magnet and a first central magnetic plate stacked sequentially, and the first central magnet is connected to the magnetic yoke; The second central magnetic part includes a third central magnet, a second central magnetic plate and a fourth central magnet stacked in sequence, wherein the third central magnet is connected to the magnetic yoke; The first side magnetic part includes a first side magnet and a first side magnetic plate stacked together, and the first side magnet is connected to the magnetic yoke; The first central magnet, the third central magnet, the fourth central magnet, and the first side magnet are all magnetized along the vibration direction of the vibration system, and the magnetization directions of the first central magnet and the fourth central magnet are opposite to the magnetization directions of the third central magnet and the first side magnet. The extension portion is provided with a second fixing portion corresponding to the second central magnetic portion, the second fixing portion is connected to the fourth central magnet, and the vibrating plate is provided with the hollow hole corresponding to the second central magnetic portion.

[0009] In one embodiment, the magnetic circuit system further includes a second side magnetic portion disposed on the yoke, the second side magnetic portion being located between two adjacent voice coils arranged along the extension direction of the first side, and the second fixing portion being connected to the first center magnetic portion or the second center magnetic portion or the second side magnetic portion. Each of the first central magnetic portion is spaced apart from the first side magnetic portion, the second side magnetic portion and the second central magnetic portion to form a magnetic gap.

[0010] In one embodiment, the second side magnetic part includes a second side magnet and a second side magnetic plate stacked together, and the second side magnet is connected to the magnetic yoke; Alternatively, the second side magnetic part includes a second side magnet, a second side magnetic plate and a third side magnet stacked together. The second side magnet is connected to the magnetic yoke. The second side magnet and the third side magnet are both magnetized along the vibration direction of the vibration system and the magnetization directions are opposite. The extension part is provided with a second fixing part corresponding to the second side magnetic part. The second fixing part is connected to the third side magnet. The vibration plate is provided with the hollow hole corresponding to the second side magnetic part.

[0011] In one embodiment, the vibration system further includes a centering assembly, which includes a first support plate and a second support plate. The first support plate includes an outer fixing part, an inner fixing part, and a spring arm part connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the outer shell. The inner fixing part includes at least one fixed connection part, which connects two adjacent voice coils spaced apart along the extension direction of the second side. The second support plate connects two adjacent voice coils arranged along the extension direction of the first side.

[0012] In one embodiment, the magnetic circuit system further includes a second side magnetic portion disposed on the magnetic yoke, the second side magnetic portion being located between two adjacent voice coils arranged along the extension direction of the first side; wherein, the number of voice coils along the extension direction of the second side is at least three, the second side magnetic portion includes a plurality of second side magnetic portions, and the plurality of second side magnetic portions are spaced apart along the extension direction of the second side, and a second support plate is disposed between two adjacent second side magnetic portions; And / or, the first support piece includes two pieces, which are symmetrically arranged and respectively correspond to the two second sides; And / or, multiple voice coils are connected in series; or, multiple voice coils are connected in parallel.

[0013] In one embodiment, the first side magnet includes two parts, both of which extend along the extension direction of the first side, and the two first side magnets are respectively disposed on opposite sides of the voice coil assembly along the extension direction of the second side.

[0014] The present invention also proposes an electronic device, which includes the sound-generating device described above.

[0015] The sound-generating device of this invention houses a vibration system and a magnetic circuit system within a housing, thereby integrating the vibration system and magnetic circuit system into a single unit. Furthermore, by arranging the vibration system and magnetic circuit system opposite each other, and defining the vibration system as a diaphragm assembly and a voice coil assembly connected to the diaphragm assembly, the voice coil assembly comprises multiple voice coils arranged in an array along the extension directions of the first and second sides of the housing. The magnetic circuit system has multiple magnetic gaps, with each voice coil corresponding to one magnetic gap. When current is passed through the multiple voice coils, the multiple voice coils generate multiple magnetic fields within the magnetic circuit system. Within the gap, electrical energy is converted into mechanical energy to drive multiple voice coils, which in turn vibrate the diaphragm assembly, thus producing sound. By setting up a multi-voice coil structure, forming an array of multiple voice coils, the voice coil line length L is effectively increased. The magnetic circuit system is configured as a yoke and multiple first central magnetic parts, second central magnetic parts, and first side magnetic parts located on the yoke. Each of the multiple first central magnetic parts is located within a corresponding voice coil. The second central magnetic parts are located between two adjacent voice coils arranged along the extension direction of the second side. The first side magnetic parts are located outside the voice coil assembly. This multiple voice coil structure divides the larger magnet in the magnetic circuit system into multiple smaller magnets, not only preventing magnet breakage but also... Improving magnet utilization effectively increases the BL value, thereby enhancing the sound-generating sensitivity and loudness of the sound-generating device, and improving the sound-generating effect and performance. Furthermore, by configuring the diaphragm assembly with a ring-shaped frame portion and an extension portion located inside the frame portion, the two ends of the extension portion are connected to the frame portion, forming a hollow area between the extension portion and the frame portion. A first folded ring and a first fixing portion connected to the outside of the first folded ring are provided on the frame portion, thereby connecting the first fixing portion to the outer shell, realizing the connection between the vibration system and the outer shell. Simultaneously, the first folded ring prevents the diaphragm assembly from separating from the outer shell during vibration. A second fixing portion and a second fixing portion surrounding the second fixing portion are provided on the extension portion. The double-folded ring connects the second fixing part to the magnetic circuit system and prevents the diaphragm assembly from separating from the magnetic circuit system during vibration. It also prevents the diaphragm assembly from having reduced vibration space due to the multiple voice coils arranged in an array, thus avoiding any impact on its vibration performance. This reduces the thickness of the sound-generating device in the Z-direction, achieving a thinner and lighter design. A diaphragm plate is connected to the diaphragm to cover the perforated area, and perforations are provided on the diaphragm plate corresponding to the second fixing part and the second folded ring. This design reduces the weight of the diaphragm assembly, achieves a seal, and prevents interference between the diaphragm plate and the second folded ring of the diaphragm, ensuring the sound production effect and performance of the diaphragm assembly. Attached Figure Description

[0016] 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.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the sound-generating device provided by the present invention; Figure 2 A top view of an embodiment of the sound-generating device provided by the present invention, with the diaphragm assembly removed; Figure 3 for Figure 2 A cross-sectional view along the AA direction; Figure 4 for Figure 2 Cross-sectional view along the BB direction; Figure 5 for Figure 2 A cross-sectional view along the CC direction; Figure 6 An exploded view of an embodiment of the sound-generating device provided by the present invention; Figure 7 This is a top view of an embodiment of the diaphragm assembly provided by the present invention; Figure 8 for Figure 7 A cross-sectional view along the DD direction; Figure 9 for Figure 8 Enlarged view of point F in the middle; Figure 10 for Figure 7 A cross-sectional view along the EE direction; Figure 11 for Figure 10 Enlarged view of point G in the middle; Figure 12 This is a top view of an embodiment of the diaphragm provided by the present invention; Figure 13 This is a bottom view of an embodiment of the vibration plate provided by the present invention.

[0018] Explanation of icon numbers: 100. Sound-generating device; 1. Housing; 11. First side; 12. Second side; 2. Vibration system; 21. Diaphragm assembly; 211. Diaphragm; 2111. Frame portion; 2112. First surround; 2113. First fixing portion; 2114. Extension portion; 2115. Second fixing portion; 2116. Second surround; 2117. Hollowed-out area; 212. Vibrating plate; 2121. Hollowed-out hole; 2122. First area; 2123. Second area; 22. Voice coil assembly; 221. Voice coil; 23. Centering assembly; 231. First support plate; 2311. Outer fixing portion; 2312. Inner fixing portion; 2313. Spring arm portion; 2314. Fixed connection part; 232. Second support plate; 3. Magnetic circuit system; 31. Magnetic yoke; 311. First receiving space; 312. Second receiving space; 32. First central magnetic part; 321. First central magnet; 322. First central magnetic guide plate; 323. First protrusion; 33. Second central magnetic part; 331. Third central magnet; 332. Second central magnetic guide plate; 333. Fourth central magnet; 334. Second protrusion; 34. First side magnetic part; 341. First side magnet; 342. First side magnetic guide plate; 35. Second side magnetic part; 351. Second side magnet; 352. Second side magnetic guide plate; 36. Magnetic gap.

[0019] 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

[0020] 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.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0023] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0024] This invention provides a sound-generating device 100. It is understood that the sound-generating device 100 is used in electronic devices.

[0025] Please refer to the reference. Figures 1 to 13 As shown, in this embodiment of the invention, the sound-generating device 100 includes a housing 1, a vibration system 2, and a magnetic circuit system 3. The housing 1 has a first side 11 and a second side 12 connected to each other and arranged at an angle. The vibration system 2 includes a diaphragm assembly 21 and a voice coil assembly 22 connected to the diaphragm assembly 21. The voice coil assembly 22 includes a plurality of voice coils 221 arranged in an array along the extension direction of the first side 11 and along the extension direction of the second side 12. The magnetic circuit system 3 is connected to the housing 1 and is provided with a magnetic gap 36 corresponding to each voice coil 221. The diaphragm assembly 21 includes a diaphragm 211 and a vibrating plate 212. The diaphragm 211 includes a ring-shaped frame portion 2111 and an extension portion located inside the frame portion 2111. 2114, the two ends of the extension 2114 are respectively connected to the frame portion 2111 to form a hollow area 2117 between the extension 2114 and the frame portion 2111. The frame portion 2111 is provided with a first folding ring 2112 and a first fixing portion 2113 connected to the outside of the first folding ring 2112. The first fixing portion 2113 is connected to the outer shell 1. The extension 2114 is provided with a second fixing portion 2115 and a second folding ring 2116 arranged around the second fixing portion 2115. The second fixing portion 2115 is connected to the magnetic circuit system 3. The vibrating plate 212 is connected to the diaphragm 211 to cover the hollow area 2117, and the vibrating plate 212 is provided with a hollow hole 2121 corresponding to the second fixing portion 2115 and the second folding ring 2116.

[0026] 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 should be noted that the magnetic circuit system 3 and the vibration system 2 of the sound-generating device 100 are arranged opposite to each other.

[0027] Understandably, the diaphragm assembly 21 of the vibration system 2 is positioned opposite to the magnetic circuit system 3. Multiple voice coils 221 of the voice coil assembly 22 in the vibration system 2 are arranged in an array, with one end of each voice coil 221 connected to the diaphragm assembly 21. The magnetic circuit system 3 has multiple magnetic gaps 36 corresponding to the arrayed voice coils 221, ensuring a one-to-one correspondence between the voice coils 221 and the magnetic gaps 36. When an audio current signal is supplied to the multiple voice coils 221 of the voice coil assembly 22, the voice coils 221 generate an alternating magnetic field under the influence of the current. Simultaneously, the permanent magnet of the magnetic circuit system 3 generates a constant magnetic field with unchanged magnitude and direction. Since the magnitude and direction of the magnetic field generated by the voice coils 221 continuously change with the audio current signal, the interaction of these two magnetic fields causes the voice coils 221 to move continuously. Because the voice coils 221 are connected to the diaphragm assembly 21, this causes the diaphragm assembly 21 to vibrate. The vibration of the diaphragm assembly 21 causes air vibration, producing the corresponding sound.

[0028] To better assemble the magnetic circuit system 3 and the vibration system 2 of the sound-generating device 100. For example, in one embodiment, such as Figures 1 to 6 As shown, the sound-generating device 100 also includes a housing 1, one end of which is connected to the magnetic circuit system 3, and the other end of which is connected to the outer periphery of the vibration system 2, that is, the periphery of the diaphragm assembly 21 is connected to the other end of the housing 1. This makes the diaphragm assembly 21 of the vibration system 2 and the magnetic circuit system 3 arranged opposite to each other.

[0029] It should be noted that the outer shell 1 is used to install, fix, and support components such as the magnetic circuit system 3 and the vibration system 2; that is, the outer shell 1 provides a mounting base for components such as the magnetic circuit system 3 and the vibration system 2. It is understood that the outer shell 1 can be a single integral structure or formed by the combination of multiple separate structures; this is not limited here. In this embodiment, the outer shell 1 can be a rectangular, square, or racetrack-shaped frame or structure, that is, the outer shell 1 has a cavity with openings at both ends. The magnetic circuit system 3 and the vibration system 2 are respectively connected to the two sides of the outer shell 1 and are arranged opposite to each other, so that the magnetic circuit system 3, the outer shell 1, and the diaphragm assembly 21 of the vibration system 2 enclose and form a vibration cavity. Of course, the outer shell 1 can also be other shapes or irregular structures; this is not limited here.

[0030] Understandably, the sound-generating device 100 is used in electronic devices, meaning that the sound-generating device 100 can be installed in the electronic device through the housing 1. It should be noted that the housing 1 of the sound-generating device 100 can be a separate housing or enclosure structure from the electronic device. In this case, the housing 1 integrates the magnetic circuit system 3 and vibration system 2 of the sound-generating device 100 into a single structure, facilitating assembly and disassembly. Alternatively, the housing 1 of the sound-generating device 100 can be integrally molded with the housing or enclosure structure of the electronic device, which effectively improves structural strength and sealing performance.

[0031] In this embodiment, the outer shell 1 is used to house the fixed vibration system 2 and magnetic circuit system 3, etc., so that the sound generating device 100 can be used as an independent component in electronic devices or sound generating modules, which is not limited here. Of course, in other embodiments, the sound generating device 100 can also be a module structure, in which case the vibration system 2 and magnetic circuit system 3, etc., are installed as multiple independent components on the outer shell 1 of the module structure, which is not limited here.

[0032] It should be noted that the outer contour of the sound-generating device 100 is the same as the outer contour of the outer casing 1. In a specific example, such as... Figure 1 , Figure 2 and Figure 6 As shown, the sound-generating device 100 has a first side 11 and a second side 12 that are connected and arranged at an angle. That is, the outer casing 1 has a first side 11 and a second side 12 that are connected and arranged at an angle, which is not limited here. It is understood that the first side 11 and the second side 12 are arranged at an angle. At this time, the angle formed by the first side 11 and the second side 12 is greater than 0° and less than 180°. That is, the angle formed by the first side 11 and the second side 12 can be an acute angle, a right angle, or an obtuse angle, which is not limited here.

[0033] Optionally, the first side 11 and the second side 12 are perpendicular. In this embodiment, the outer contour of the sound-generating device 100 is rectangular, square, or racetrack-shaped. The outer shell 1 of the sound-generating device 100 can also be rectangular, square, or racetrack-shaped. To facilitate connection and assembly of the vibration system 2 and the magnetic circuit system 3 with the outer shell 1, the outer contours of the vibration system 2 and the magnetic circuit system 3 can also be rectangular, square, or racetrack-shaped.

[0034] It should be noted that the first side 11 of the sound-generating device 100 extends along the first direction, and the second side 12 extends along the second direction. At this time, the angle formed by the first direction and the second direction is greater than 0° and less than 180°. That is, the angle formed by the first direction and the second direction can be an acute angle, a right angle, or an obtuse angle, which is not limited here. Optionally, the first direction and the second direction are perpendicular to each other.

[0035] In this embodiment, the vibration system 2 of the sound-generating device 100 vibrates along a third direction. This third direction forms an angle with the plane containing the first and second directions. The angle between the third direction and the plane containing the first and second directions is greater than 0° and less than 180°. Optionally, the third direction is perpendicular to the plane containing the first and second directions. That is, the first, second, and third directions are mutually perpendicular.

[0036] When the outer contour of the sound-generating device 100 is rectangular or racetrack-shaped, the first direction is the length direction or X-direction of the sound-generating device 100, the second direction is the width direction or Y-direction of the sound-generating device 100, and the third direction is the thickness direction or Z-direction of the sound-generating device 100. At this time, the vibration system 2 vibrates along the third direction (e.g., the vertical direction).

[0037] It should be noted that, in the context of slimmer and lighter designs, traditional loudspeakers typically use one or two voice coils, resulting in low utilization of the magnetic circuit located inside the voice coil, making it difficult to meet performance requirements. Furthermore, in a dual voice coil structure, the voice coil extends along its length, resulting in a longer magnet inside the voice coil. Because the magnet is relatively thin, it is more prone to breakage.

[0038] In this embodiment, as Figures 3 to 6 As shown, by housing the vibration system 2 and the magnetic circuit system 3 within the outer casing 1, the outer casing 1 is used to install the vibration system 2 and the magnetic circuit system 3, integrating the vibration system 2 and the magnetic circuit system 3 into one unit. The vibration system 2 is configured as a diaphragm assembly 21 and a voice coil assembly 22 connected to the diaphragm assembly 21. The voice coil assembly 22 is configured as a plurality of voice coils 221 arranged in an array along the extension direction of the first side 11 and the extension direction of the second side 12 of the outer casing 1. Multiple magnetic gaps 36 are provided on the magnetic circuit system 3, such that each voice coil 221 corresponds to one magnetic gap 36. When current is passed through the multiple voice coils 221, the multiple voice coils 221 convert electrical energy into mechanical energy within the multiple magnetic gaps 36 formed by the magnetic circuit system 3, driving the multiple voice coils 221 to vibrate the diaphragm assembly 21, thereby achieving… The sound-generating device 100 generates sound by setting up a multi-voice coil structure, forming multiple voice coils 221 arranged in an array, which effectively increases the voice coil line length L. The magnetic circuit system 3 is set as a magnetic yoke 31 and multiple first central magnetic parts 32, second central magnetic parts 33 and first side magnetic parts 34 provided on the magnetic yoke 31. Each of the multiple first central magnetic parts 32 is located in a corresponding voice coil 221. The second central magnetic parts 33 are located between two adjacent voice coils 221 arranged along the extension direction of the second side 12. The first side magnetic parts 34 are located outside the voice coil assembly 22. The structure of multiple voice coils 221 will divide the larger magnet of the magnetic circuit system 3 into multiple smaller magnets, which not only avoids magnet breakage, but also improves magnet utilization, effectively increases the BL value, and thus improves the sound-generating sensitivity and loudness of the sound-generating device 100, thereby improving the sound-generating effect and sound-generating performance.

[0039] Optionally, the external dimensions of the plurality of voice coils 221 of the voice coil assembly 22 are set to be the same. In this embodiment, the aspect ratio of each voice coil 221 of the voice coil assembly 22 is optionally greater than or equal to 2.

[0040] It should be noted that the multiple voice coils 221 arranged along the first direction in the voice coil assembly 22 are defined as a voice coil group, and the multiple voice coil groups of the voice coil assembly 22 are arranged at intervals along the second direction. This makes the multiple voice coils 221 of each voice coil group arranged at intervals along the second direction arranged along the first direction, so that the multiple voice coils 221 of the voice coil assembly 22 are arranged in an array along the first direction and along the second direction.

[0041] Understandably, the voice coil assembly 22 includes multiple voice coil groups spaced apart along the second direction, and each voice coil group includes multiple voice coils 221 arranged along the first direction. That is, there are at least two voice coil groups spaced apart along the second direction and at least two voice coils 221 arranged along the first direction. In this case, the voice coil assembly 22 of the vibration system 2 includes at least four voice coils 221, and the four voice coils 221 are arranged in an array along the first and second directions.

[0042] Optionally, the voice coil groups spaced apart along the second direction can be 2, 3, 4, 5, 6 or more, and the voice coils 221 arranged along the first direction can be 2, 3, 4, 5, 6 or more, without limitation. In this embodiment, the voice coil assembly 22 includes 4 voice coils 221, 6 voice coils 221, 8 voice coils 221, 9 voice coils 221 or 10 voice coils 221, etc., as long as the multiple voice coils 221 are arranged in an array along the first and second directions, without limitation.

[0043] It should be noted that, in the context of thinner and lighter designs, traditional loudspeakers typically use one or two voice coils. Since the number of voice coils is small, it does not affect the vibration performance of the diaphragm. However, this application employs a multi-voice coil structure to form an array of multiple voice coils 221, all of which are connected to the diaphragm assembly 21. Because the central position of the diaphragm assembly 21 is connected to the multiple voice coils 221, the central position of the diaphragm assembly 21 will sink, thereby reducing the gap between the diaphragm assembly 21 and the magnetic circuit system 3. To ensure the normal vibration performance of the diaphragm assembly 21, it is necessary to maintain the vibration space between the diaphragm assembly 21 and the magnetic circuit system 3, which inevitably increases the thickness of the sound-generating device 100 in the Z-direction.

[0044] In this embodiment, the diaphragm assembly 21 includes a first fixing part 2113 connected to one end of the outer shell 1 and a second fixing part 2115 connected to the magnetic circuit system 3. It can be understood that the periphery of the diaphragm assembly 21 of the vibration system 2 is connected to the outer shell 1, and the position of the diaphragm assembly 21 of the vibration system 2 corresponding to the magnetic circuit system 3 can also be connected to the magnetic circuit system 3.

[0045] Of course, in other embodiments, the diaphragm assembly 21 of the vibration system 2 may be connected only to the housing 1, so that the diaphragm assembly 21 and the magnetic circuit system 3 are arranged opposite to each other, which is not limited here.

[0046] To ensure the vibration performance of the diaphragm assembly 21, the outer periphery of the diaphragm assembly 21 is connected to the outer shell 1. When the inner side of the diaphragm assembly 21 is connected to the magnetic circuit system 3, a folded ring structure is provided on the inner side of the diaphragm assembly 21 near the position connected to the outer shell 1, and a folded ring structure is provided on the outer side of the diaphragm assembly 21 near the position connected to the magnetic circuit system 3.

[0047] Understandable, such as Figure 1 , Figure 6 , Figure 7 and Figure 12 As shown, the diaphragm assembly 21 of the vibration system 2 can optionally be arranged in a rectangular or racetrack shape. In this embodiment, as... Figure 1 , Figures 3 to 13 As shown, the diaphragm assembly 21 includes a diaphragm 211 and a vibrating plate 212 connected to the diaphragm 211. Optionally, the diaphragm 211 of the diaphragm assembly 21 has multiple folded ring structures.

[0048] In one implementation, such as Figure 1 , Figures 3 to 13 As shown, the diaphragm 211 includes a central portion, a first folded ring 2112 and a first fixing portion 2113. The first folded ring 2112 is arranged around the central portion, and the first fixing portion 2113 is arranged around the first folded ring 2112. The central portion is provided with a second fixing portion 2115 and a second folded ring 2116 arranged around the second fixing portion 2115.

[0049] Understandably, the first fixing part 2113 of the diaphragm 211 is connected to the outer shell 1, realizing the connection between the vibration system 2 and the outer shell 1. At the same time, the first folding ring 2112 is used to prevent the diaphragm assembly 21 from separating from the outer shell 1 during vibration. The second fixing part 2115 is connected to the magnetic circuit system 3. The second folding ring 2116 is used to prevent the diaphragm assembly 21 from separating from the magnetic circuit system 3 during vibration. At the same time, it prevents the diaphragm assembly 21 from reducing the vibration space due to the sinking of the multiple voice coils 221 arranged in the array, thereby affecting the vibration performance of the diaphragm assembly 21. This reduces the thickness of the sound-generating device 100 in the Z direction, achieving a thinner and lighter design. This is not limited here.

[0050] In this embodiment, as Figure 1 , Figure 3 As shown, the magnetic circuit system 3 is connected to the housing 1, the first fixing part 2113 of the diaphragm assembly 21 is connected to the housing 1, and the second fixing part 2115 of the diaphragm assembly 21 is connected to the magnetic circuit system 3.

[0051] Optionally, the second fixing part 2115 is connected to either the first central magnet part 32 or the second central magnet part 33. In this embodiment, when the second fixing part 2115 is connected to the first central magnet part 32 of the magnetic circuit system 3, the diaphragm assembly 21 is spaced apart from the second central magnet part 33 and the first side magnet part 34, forming a vibration space between the diaphragm assembly 21 and the second central magnet part 33 and the first side magnet part 34. When the second fixing part 2115 is connected to the second central magnet part 33 of the magnetic circuit system 3, the diaphragm assembly 21 is spaced apart from the first central magnet part 32 and the first side magnet part 34, forming a vibration space between the diaphragm assembly 21 and the first central magnet part 32 and the first side magnet part 34, which is not limited here.

[0052] Understandably, the first folding ring 2112 and the first fixing portion 2113 of the diaphragm 211 form a ring-shaped frame portion 2111, and an extension portion 2114 is provided at the center of the diaphragm 211. The extension portion 2114 is connected to the frame portion 2111 and surrounds the frame portion 2111 to form a hollow area 2117. In this embodiment, the second fixing portion 2115 and the second folding ring 2116 are provided on the extension portion 2114.

[0053] Optionally, the extension 2114 extends along a first direction; or, the extension 2114 extends along a second direction; or, the extension 2114 has a first segment extending along the first direction and a second segment extending along the second direction, wherein the first segment and the second segment can be connected to form a cross shape or an I-shape, which is not limited here.

[0054] Of course, the extension portion 2114 includes multiple extension portions 2114, which are spaced apart. Optionally, the multiple extension portions 2114 extend along the first direction and are spaced apart along the second direction; or, the multiple extension portions 2114 extend along the second direction and are spaced apart along the first direction, which is not limited here.

[0055] In this embodiment, the vibrating plate 212 is connected to the central part, and the vibrating plate 212 is provided with a hollow hole 2121 corresponding to the second fixing part 2115 and the second folding ring 2116. It can be understood that the vibrating plate 212 is located between the first folding ring 2112 and the second folding ring 2116.

[0056] It should be noted that the central portion of the diaphragm 211, the first fold ring 2112, and the first fixing portion 2113 can be selected as an integrally molded structure. That is, the frame portion 2111 and the extension portion 2114 of the diaphragm 211 can be selected as an integrally molded structure.

[0057] Understandably, the central part of the diaphragm 211 can be a flat or planar structure; or, the central part of the diaphragm 211 can also be a ring structure, that is, the central part has a hollow area 2117, which can reduce the weight of the diaphragm assembly 21. By setting a vibrating plate 212, which is connected to the central part, the structural strength of the central part of the diaphragm 211 can be strengthened by the vibrating plate 212.

[0058] In this embodiment, the diaphragm 212 is located on the side of the diaphragm 211 facing away from the voice coil 221 at its center; or, the diaphragm 212 is located on the side of the diaphragm 211 facing the voice coil 221 at its center, which is not limited here. It can be understood that when the diaphragm 211 has a hollow area 2117, the diaphragm 212 is connected to the center of the diaphragm 211 and covers the hollow area 2117.

[0059] In one embodiment, the vibrating plate 212 includes a first region 2122 connected to the diaphragm 211 and a second region 2123 corresponding to the hollowed-out region 2117, wherein the first region 2122 is a pressing edge structure.

[0060] In this embodiment, as Figures 8 to 13 As shown, by setting the first region 2122 of the vibrating plate 212 as a pressing structure, the vibrating plate 212 avoids the bonding area of ​​the diaphragm 211 and saves vibration space.

[0061] Optionally, the sum of the thickness of the first region 2122 along the vibration direction of the vibration system 2 and the thickness of the diaphragm 211 along the vibration direction of the vibration system 2 is equal to the thickness of the second region 2123 along the vibration direction of the vibration system 2. That is, the sum of the thickness of the pressing structure of the vibrating plate 212 along the third direction and the thickness of the connection with the diaphragm 211 along the third direction is equal to the thickness of the vibrating plate 212 at the corresponding hollowed-out region 2117 position along the third direction.

[0062] Optionally, the first fold ring 2112 can be a convex hull structure that protrudes upward along a third direction or a concave hull structure that is recessed downward, and there is no limitation on this. Optionally, the second fold ring 2116 can be a convex hull structure that protrudes upward along a third direction or a concave hull structure that is recessed downward, and there is no limitation on this.

[0063] Understandably, the second fold ring 2116 of the diaphragm 211 passes through the perforation 2121; or, the perforation 2121 of the vibrating plate 212 is positioned directly opposite the second fold ring 2116 and the second fixing part 2115 of the diaphragm 211, which is not limited here.

[0064] It should be noted that the protrusion direction of the first folding ring 2112 and the protrusion direction of the second folding ring 2116 can be the same or different. Optionally, the protrusion direction of the first folding ring 2112 is different from the protrusion direction of the second folding ring 2116. In this embodiment, as shown... Figure 1 , Figures 3 to 6 , Figures 8 to 12 As shown, the first fold ring 2112 is concave downward along the third direction, and the second fold ring 2116 is convex upward along the third direction.

[0065] In this embodiment, the diaphragm 211 of the diaphragm assembly 21 is configured as a ring-shaped frame portion 2111 and an extension portion 2114 located inside the frame portion 2111, such that both ends of the extension portion 2114 are connected to the frame portion 2111, thereby forming a hollow area 2117 between the extension portion 2114 and the frame portion 2111. A first folded ring 2112 and a first fixing portion 2113 connected to the outside of the first folded ring 2112 are provided on the frame portion 2111, thereby connecting the first fixing portion 2113 to the outer shell 1, realizing the connection between the vibration system 2 and the outer shell 1. Simultaneously, the first folded ring 2112 is used to prevent the diaphragm assembly 21 from separating from the outer shell 1 during vibration. A second fixing portion 2115 and a surrounding portion are provided on the extension portion 2114. The second folding ring 2116 provided in 2115 connects the second fixing part 2115 to the magnetic circuit system 3, and the second folding ring 2116 prevents the diaphragm assembly 21 from separating from the magnetic circuit system 3 during vibration. At the same time, it reduces the thickness of the sound generating device 100 in the Z direction, achieving a thinner and lighter design. The vibrating plate 212 is connected to the diaphragm 211 to cover the hollow area 2117. The vibrating plate 212 has a hollow hole 2121 corresponding to the second fixing part 2115 and the second folding ring 2116. In this way, the weight of the diaphragm assembly 21 can be reduced, the diaphragm assembly 21 can be sealed, and the hollow hole 2121 can prevent interference between the vibrating plate 212 and the second folding ring 2116 of the diaphragm 211, thus ensuring the sound generation effect and sound generation performance of the diaphragm assembly 21.

[0066] It should be noted that the first fixing part 2113 may extend along a plane perpendicular to the third direction to form a planar or flat connecting part; or, the first fixing part 2113 may extend along a third direction to form a vertical planar or vertical plate-like connecting part parallel to the third direction; or, the first fixing part 2113 may include a planar or flat connecting part extending along a plane perpendicular to the third direction and a vertical planar or vertical plate-like connecting part extending along the third direction, which is not limited here. It is understood that the second fixing part 2115 extends along a plane perpendicular to the third direction to form a planar shape, which is not limited here.

[0067] Understandably, each voice coil 221 has two first long straight sides extending along a first direction and two first short sides connecting the two first long straight sides. The two first long straight sides and the two first short sides are connected end to end, making the voice coil 221 a rectangular or racetrack-shaped ring structure. In this embodiment, the ratio of the dimension of the voice coil 221 along the first direction to the dimension of the voice coil 221 along the second direction can optionally be greater than 2, that is, the aspect ratio of the voice coil 221 is greater than 2, thus making the voice coil 221 a long strip structure.

[0068] It should be noted that the connection between the first long straight side and the first short side of the voice coil 221 can be a right angle that is perpendicular to each other. In this case, the two first long straight sides and the two first short sides of the voice coil 221 are connected end to end to form a right-angled rectangular structure. That is, the first long straight side extends along the first direction and the first short side extends along the second direction. The aspect ratio of the voice coil 221 is the ratio of the dimension of the first long straight side along the first direction to the dimension of the first short side along the second direction.

[0069] Of course, for aesthetic reasons, structural strength requirements, and manufacturing specifications, the connection between the first long straight side and the first short side of the voice coil 221 can also be a rounded corner structure with a smooth transition. In this case, the two first long straight sides and the two first short sides of the voice coil 221 connect end to end to form a rounded rectangle or racetrack-shaped structure. That is, the first short side has a first straight segment extending along the second direction and two first arc-shaped segments connecting the two ends of the first straight segment. The first long straight side extends along the first direction and connects to the end of the first arc-shaped segment away from the first straight segment. The aspect ratio of the voice coil 221 is the ratio of the distance between the two first straight segments along the first direction to the distance between the two first long straight sides along the second direction. Alternatively, the first short side can be entirely arc-shaped, and the aspect ratio of the voice coil 221 is the ratio of the maximum distance between the two first short sides along the first direction to the distance between the two first long straight sides along the second direction. No limitation is made here.

[0070] In this embodiment, the voice coil assembly 22 has multiple voice coils 221 arranged in an array along the first and second directions, and the magnetic circuit system 3 has multiple magnetic gaps 36 arranged in an array along the first and second directions, with each voice coil 221 corresponding to a magnetic gap 36. It can be understood that by setting multiple voice coils 221, the total length of the voice coils 221 can be increased, and the multiple voice coils 221 divide the larger magnet of the magnetic circuit system 3 into multiple smaller magnets, thereby improving magnet utilization. This increases the product BL value of the sound-generating device 100, thus significantly improving the sound-generating sensitivity and loudness of the sound-generating device 100, and enhancing the sound production effect.

[0071] In one embodiment, the magnetic circuit system 3 includes a yoke 31 and a first central magnetic part 32, a second central magnetic part 33 and a first side magnetic part 34 disposed on the yoke 31. The first central magnetic part 32 includes a plurality of parts, each of which is located in a voice coil 221 corresponding to it. The second central magnetic part 33 is located between two adjacent voice coils 221 arranged along the extension direction of the second side 12. The first side magnetic part 34 is located outside the voice coil assembly 22.

[0072] In this embodiment, as Figures 1 to 6 As shown, multiple first central magnets 32, second central magnets 33, and first side magnets 34 are all disposed on the side of the yoke 31 facing the diaphragm assembly 21. Each of the multiple first central magnets 32 is located inside a voice coil 221, and the first side magnets 34 are located outside the voice coil assembly 22, that is, the first side magnets 34 are located outside the array of multiple voice coils 221. The second central magnets 33 are located between two adjacent voice coil groups, that is, a second central magnet 33 is provided between two adjacent voice coils 221 arranged along the second direction.

[0073] Understandably, the number of first central magnets 32 is consistent with the number of voice coils 221 in the voice coil assembly 22. That is, multiple first central magnets 32 are arranged in a one-to-one correspondence with multiple voice coils 221, and each first central magnet 32 ​​is located within a corresponding voice coil 221. Optionally, the number of second central magnets 33 can be one or more. When the number of voice coil groups arranged at intervals along the second direction is N1 (N1≥2), the number of second central magnets 33 along the second direction is N1-1. In this case, the second central magnets 33 can optionally extend along the first direction, and the length of the second central magnets 33 extending along the first direction is approximately equal to the sum of the lengths of the multiple voice coils 221 arranged along the first direction in each voice coil group.

[0074] Of course, the second central magnet 33 between two adjacent voice coil groups along the second direction includes multiple units along the first direction. At this time, when the number of voice coils 221 arranged in each voice coil group along the first direction is N2 (N2≥2), the number of second central magnets 33 between two adjacent voice coil groups along the first direction is less than or equal to N2.

[0075] In this embodiment, when the number of voice coils 221 in the voice coil assembly 22 is four, that is, the number of voice coil groups along the second direction is two, and the number of voice coils 221 arranged in each voice coil group along the first direction is two. At this time, the number of second central magnets 33 located between the two voice coil groups can be one or two. When there is one second central magnet 33, the second central magnet 33 extends along the first direction, such that the second central magnet 33 corresponds to the two voice coils 221 arranged in each voice coil group along the first direction. When there are two second central magnets 33, the two second central magnets 33 are arranged sequentially along the first direction, and each second central magnet 33 corresponds to each voice coil 221 of each voice coil group along the first direction.

[0076] Understandably, when the number of voice coil groups in the voice coil assembly 22 along the second direction is 2, and the number of voice coils 221 arranged in each voice coil group along the first direction is N2 (N2≥2), the number of second central magnets 33 is 1~N2.

[0077] When the number of voice coil groups along the second direction in the voice coil assembly 22 is N1 (N1≥2), and the number of voice coils 221 arranged along the first direction in each voice coil group is N2 (N2≥2), the number of second central magnets 33 between two adjacent voice coil groups is 1~N2. At this time, the number of second central magnets 33 in the N1 voice coil groups in the voice coil assembly 22 is N1. (1~N2), without limitation.

[0078] Understandably, when the number of voice coil groups along the second direction in the voice coil assembly 22 is 3, the voice coil 221 of the middle voice coil group is located within the magnetic gap 36 formed between the first central magnet 32 ​​and the two second central magnets 33 along the second direction, which is not limited here. That is, the first central magnet 32 ​​in the voice coil 221 of the middle voice coil group has second central magnets 33 respectively provided on both sides along the second direction. The voice coil 221 adjacent to the first side 11 is located within the magnetic gap 36 formed by the first central magnet 32 ​​and the first side magnet 34 and the second central magnet 33, which is not limited here.

[0079] It should be noted that when the voice coil assembly 22 includes four voice coils 221 arranged in an array, each first central magnetic part 32 of the magnetic circuit system 3 is spaced apart from the first side magnetic part 34 and the second central magnetic part 33 to form a magnetic gap 36. When there are more than four voice coils 221 arranged in an array in the voice coil assembly 22, such as six, eight, or nine voice coils 221, the voice coils 221 adjacent to the first side 11 are located within the magnetic gap 36 formed by the spaced first central magnetic part 32, the first side magnetic part 34, and the second central magnetic part 33, and the voice coil 221 located in the middle is located within the magnetic gap 36 formed by the spaced first central magnetic part 32 and the two second central magnetic parts 33 along the second direction. This is not limited here.

[0080] Optionally, the first side magnet 34 includes two parts, both of which extend along the extension direction of the first side 11, and the two first side magnets 34 are respectively disposed on opposite sides of the voice coil assembly 22 along the extension direction of the second side 12.

[0081] In this embodiment, when there are two first side magnets 34, the two first side magnets 34 are located on opposite sides of the voice coil assembly 22 along the second direction, and both first side magnets 34 extend along the first direction.

[0082] Of course, the number of first side magnets 34 located on each side of the voice coil assembly 22 along the second direction can be one or more. When there is one first side magnet 34, the first side magnet 34 extends along the first direction, and the length of the first side magnet 34 extending along the first direction is approximately equal to the sum of the lengths of the multiple voice coils 221 arranged in each voice coil group along the first direction. When there are multiple first side magnets 34, the multiple first side magnets 34 are arranged along the first direction, and the number of the multiple first side magnets 34 is less than or equal to the number of voice coils 221 arranged in each voice coil group along the first direction. If the number of voice coils 221 arranged in each voice coil group along the first direction is N2 (N2≥2), then the number of first side magnets 34 is 1~N2, which is not limited here.

[0083] In one embodiment, the first central magnetic part 32 includes a first central magnet 321, a first central magnetic plate 322 and a second central magnet stacked in sequence, and the first central magnet 321 is connected to the magnetic yoke 31; the second central magnetic part 33 includes a third central magnet 331 and a second central magnetic plate 332 stacked in sequence, and the third central magnet 331 is connected to the magnetic yoke 31; the first side magnetic part 34 includes a first side magnet 341 and a first side magnetic plate 342 stacked in sequence, and the first side magnet 341 is connected to the magnetic yoke 31.

[0084] In this embodiment, the first central magnet 321, the first central magnetic plate 322, and the second central magnet of the first central magnetic part 32 are optionally stacked sequentially along a third direction. The third central magnet 331 and the second central magnetic plate 332 of the second central magnetic part 33 are optionally stacked sequentially along a third direction. The first side magnet 341 and the first side magnetic plate 342 of the first side magnetic part 34 are optionally stacked sequentially along a third direction.

[0085] Optionally, the first central magnet 321, the second central magnet, the third central magnet 331 and the first side magnet 341 are all magnetized along the vibration direction of the vibration system 2, and the magnetization direction of the first central magnet 321 is opposite to the magnetization direction of the second central magnet, the third central magnet 331 and the first side magnet 341.

[0086] Understandably, both the first central magnet 321 and the second central magnet of the first central magnetic section 32 are magnetized along the vibration direction of the vibration system 2, but in opposite directions, making the first central magnetic section 32 a counter-magnetic structure. This effectively increases the magnet volume and the B value, thereby improving performance.

[0087] To reduce the thickness of the sound-generating device 100 along a third direction, in one embodiment, the diaphragm assembly 21 of the vibration system 2 is connected to the first central magnet 32 ​​of the magnetic circuit system 3. In this embodiment, the extension 2114 is provided with a second fixing part 2115 corresponding to each first central magnet 32, each second fixing part 2115 is connected to a second central magnet, and the vibrating plate 212 is provided with a hollow hole 2121 corresponding to each first central magnet 32.

[0088] Understandably, the diaphragm assembly 21 is positioned opposite and spaced apart from the second central magnet 33 and the first side magnet 34 of the magnetic circuit system 3, which facilitates the voice coil 221 driving the diaphragm assembly 21 to vibrate and produce sound. Optionally, the second fixing part 2115 of the diaphragm assembly 21 is connected to the second central magnet of the first central magnet 32.

[0089] It should be noted that the first central magnetic part 32 includes multiple components. In this embodiment, each of the multiple first central magnetic parts 32 includes a first central magnet 321, a first central magnetic guide plate 322, and a second central magnet arranged in sequence. At this time, the diaphragm assembly 21 is provided with multiple second fixing parts 2115 and multiple second folding rings 2116. Each second fixing part 2115 is connected to a first central magnetic part 32, and each second folding ring 2116 is arranged around a second fixing part 2115, which is not limited here.

[0090] Of course, in other embodiments, at least one of the plurality of first central magnetic portions 32 is a magnetically opposed structure, that is, it includes a first central magnet 321, a first central magnetic plate 322 and a second central magnet stacked in sequence. If the first central magnetic portion 32 is not a magnetically opposed structure, then the first central magnetic portion 32 includes a first central magnet 321 and a first central magnetic plate 322 stacked in sequence, which is not limited here.

[0091] Understandably, the first central magnet 321, the first central magnetic plate 322, and the second central magnet of the first central magnetic section 32 may optionally be plate-shaped and have similar outlines, such as rectangular or racetrack-shaped, without limitation. The third central magnet 331 and the second central magnetic plate 332 of the second central magnetic section 33 may optionally be plate-shaped and have similar outlines, such as rectangular or racetrack-shaped, without limitation. The first side magnet 341 and the first side magnetic plate 342 of the first side magnetic section 34 may optionally be plate-shaped and have similar outlines, such as rectangular or racetrack-shaped, without limitation.

[0092] In this embodiment, the outer shell 1 is connected to the first side magnetic part 34 of the magnetic circuit system 3. Optionally, the outer shell 1 and the first side magnetic plate 342 of the first side magnetic part 34 can be integrally formed, such as integral injection molding or integral stretch molding; or, the outer shell 1 and the first side magnetic plate 342 of the first side magnetic part 34 can be bonded or welded, which is not limited here.

[0093] In another embodiment, the first central magnetic part 32 includes a first central magnet 321 and a first central magnetic plate 322 stacked in sequence, and the first central magnet 321 is connected to the magnetic yoke 31; the second central magnetic part 33 includes a third central magnet 331, a second central magnetic plate 332 and a fourth central magnet 333 stacked in sequence, and the third central magnet 331 is connected to the magnetic yoke 31; the first side magnetic part 34 includes a first side magnet 341 and a first side magnetic plate 342 stacked in sequence, and the first side magnet 341 is connected to the magnetic yoke 31.

[0094] In this embodiment, as Figures 3 to 6 As shown, the first central magnet 321 and the first central magnetic plate 322 of the first central magnetic section 32 are optionally stacked sequentially along a third direction. The third central magnet 331, the second central magnetic plate 332, and the fourth central magnet 333 of the second central magnetic section 33 are optionally stacked sequentially along a third direction. The first side magnet 341 and the first side magnetic plate 342 of the first side magnetic section 34 are optionally stacked sequentially along a third direction.

[0095] Optionally, the first central magnet 321, the third central magnet 331, the fourth central magnet 333 and the first side magnet 341 are all magnetized along the vibration direction of the vibration system 2, and the magnetization directions of the first central magnet 321 and the fourth central magnet 333 are opposite to the magnetization directions of the third central magnet 331 and the first side magnet 341.

[0096] Understandably, the third central magnet 331 and the fourth central magnet 333 of the second central magnetic section 33 are both magnetized along the vibration direction of the vibration system 2, but in opposite directions, making the second central magnetic section 33 a counter-magnetic structure. This effectively increases the magnet volume and the B value, thereby improving performance.

[0097] To reduce the thickness of the sound-generating device 100 along a third direction, in one embodiment, the diaphragm assembly 21 of the vibration system 2 is connected to the second central magnet 33 of the magnetic circuit system 3. In this embodiment, as... Figure 3 and Figure 4 As shown, the extension 2114 is provided with a second fixing part 2115 corresponding to the second central magnet 33. The second fixing part 2115 is connected to the fourth central magnet 333. The vibrating plate 212 is provided with a hollow hole 2121 corresponding to the second central magnet 33.

[0098] Understandably, the diaphragm assembly 21 is positioned opposite and spaced apart from the first central magnet 32 ​​and the first side magnet 34 of the magnetic circuit system 3, which facilitates the voice coil 221 driving the diaphragm assembly 21 to vibrate and produce sound. Optionally, the second fixing part 2115 of the diaphragm assembly 21 is connected to the fourth central magnet 333 of the second central magnet 33.

[0099] It should be noted that the second central magnet 33 may optionally include multiple components. In this embodiment, each of the multiple second central magnets 33 includes a third central magnet 331, a second central magnetic plate 332, and a fourth central magnet 333 stacked sequentially. In this case, the diaphragm assembly 21 is provided with multiple second fixing parts 2115 and multiple second folding rings 2116. Each second fixing part 2115 is connected to a second central magnet 33, and each second folding ring 2116 is arranged around a second fixing part 2115, which is not limited here.

[0100] Of course, in other embodiments, at least one of the plurality of second central magnetic parts 33 is a magnetically opposed structure, that is, it includes a third central magnet 331, a second central magnetic plate 332 and a fourth central magnet 333 stacked in sequence. If the second central magnetic part 33 is not a magnetically opposed structure, then the second central magnetic part 33 includes a third central magnet 331 and a second central magnetic plate 332 stacked in sequence, which is not limited here.

[0101] In one embodiment, the magnetic yoke 31 has a first receiving space 311 corresponding to the first central magnetic part 32, and the first central magnetic part 32 has a first protrusion 323 extending into the first receiving space 311. The first central magnetic part 32 and the magnetic yoke 31 are integrally hot-pressed to make the outer periphery of the first protrusion 323 fit against the inner wall of the first receiving space 311. The first receiving space 311 is a groove structure provided in the magnetic yoke 31; or, the first receiving space 311 is a through hole structure that passes through the magnetic yoke 31; or, the first receiving space 311 passes through the magnetic yoke 31, and the first protrusion 323 is flush with the side of the magnetic yoke 31 facing away from the first central magnetic part 32.

[0102] In this embodiment, as Figure 3 , Figure 5 and Figure 6 As shown, the magnetic yoke 31 has a first side facing the diaphragm assembly 21 and a second side away from the diaphragm assembly 21. By providing a first receiving space 311 on the magnetic yoke 31 and a first protrusion 323 on the first central magnetic part 32, the first protrusion 323 is confined within the first receiving space 311. This increases the magnet volume of the first central magnet 321 of the first central magnetic part 32, increases the B value, and improves performance.

[0103] Understandably, the first central magnet 321 of the first central magnet part 32 has a first protrusion 323 protruding on the side facing away from the first central magnetic guide plate 322. Optionally, the first central magnet part 32 and the magnetic yoke 31 are integrally hot-pressed to make the outer periphery of the first protrusion 323 fit snugly against the inner wall of the first receiving space 311. This allows the first central magnet 321 of the first central magnet part 32 and the magnetic yoke 31 to achieve "zero fit", making the connection between the first central magnet 321 and the magnetic yoke 31 almost completely fit, eliminating assembly tolerances and material tolerances, and maximizing the volume of the first central magnet 321.

[0104] Optionally, the first central magnet 321 is made of neodymium iron boron material. By integrally hot-pressing the first central magnet 321 and the yoke 31, the outer periphery of the first protrusion 323 of the first central magnet 321 is fitted to the inner wall of the first accommodating space 311 of the yoke 31. This achieves a "zero-fit" connection between the first central magnet 321 and the yoke 31, making the connection point of the first central magnet 321 and the yoke 31 almost completely fitted. This eliminates assembly tolerances and material tolerances, maximizing the volume of the first central magnet 321. Moreover, compared to sintered NdFeB, hot-pressed NdFeB improves the mechanical strength of the first central magnet 321 and makes it less prone to breakage. This allows the sound-generating device 100 to not only achieve an ultra-thin magnetic circuit design but also increase the magnet volume of the magnetic circuit system 3, thereby improving the sound-generating performance of the sound-generating device 100. Furthermore, it makes the structure of the magnetic circuit system 3 more reliable and less prone to breakage. This not only improves the stability of the product but also meets higher performance requirements, compensating for the performance loss caused by the thinner and lighter design of the sound-generating device 100.

[0105] It is understood that the first receiving space 311 of the magnetic yoke 31 can be a groove structure or a through-hole structure, and is not limited here. Optionally, the first receiving space 311 is a groove structure provided on the first side of the magnetic yoke 31. In this embodiment, as Figure 3 , Figure 5 and Figure 6 As shown, the first accommodating space 311 is a through-hole structure that passes through the first and second sides of the magnetic yoke 31.

[0106] Optionally, the first protrusion 323 is flush with the side of the magnetic yoke 31 facing away from the first central magnetic part 32. In this embodiment, as... Figure 3 and Figure 5 As shown, the side of the first protrusion 323 facing away from the first central magnetic plate 322 is flush with the second side of the magnetic yoke 31.

[0107] In one embodiment, the magnetic yoke 31 has a second receiving space 312 corresponding to the second central magnetic part 33, and the second central magnetic part 33 has a second protrusion 334 extending into the second receiving space 312. The second central magnetic part 33 and the magnetic yoke 31 are integrally hot-pressed to make the outer periphery of the second protrusion 334 fit against the inner wall of the second receiving space 312. The second receiving space 312 is a groove structure provided in the magnetic yoke 31; or, the second receiving space 312 is a through hole structure that penetrates the magnetic yoke 31; or, the second receiving space 312 penetrates the magnetic yoke 31, and the second protrusion 334 is flush with the side of the magnetic yoke 31 facing away from the second central magnetic part 33.

[0108] In this embodiment, as Figure 3 , Figure 4 and Figure 6 As shown, the magnetic yoke 31 has a first side facing the diaphragm assembly 21 and a second side facing away from the diaphragm assembly 21. By providing a second receiving space 312 on the magnetic yoke 31 and providing a second protrusion 334 on the second central magnetic part 33, the second protrusion 334 is confined within the second receiving space 312. This increases the magnet volume of the third central magnet 331 of the second central magnetic part 33, increases the B value, and improves performance.

[0109] Understandably, the third central magnet 331 of the second central magnet part 33 has a second protrusion 334 protruding on the side facing away from the second central magnetic guide plate 332. Optionally, the second central magnet part 33 and the magnetic yoke 31 are integrally hot-pressed to make the outer periphery of the second protrusion 334 fit snugly against the inner wall of the second receiving space 312. This allows the third central magnet 331 of the second central magnet part 33 to achieve "zero fit" with the magnetic yoke 31, making the connection between the third central magnet 331 and the magnetic yoke 31 almost completely fit, eliminating assembly tolerances and material tolerances, and maximizing the volume of the third central magnet 331.

[0110] Optionally, the third central magnet 331 is made of neodymium iron boron material. By integrally hot-pressing the third central magnet 331 and the yoke 31, the outer periphery of the second protrusion 334 of the third central magnet 331 is fitted to the inner wall of the second accommodating space 312 of the yoke 31. This achieves a "zero-fit" connection between the third central magnet 331 and the yoke 31, making the connection point of the third central magnet 331 almost completely fitted. This eliminates assembly tolerances and material tolerances, maximizing the volume of the third central magnet 331. Moreover, compared to sintered NdFeB, hot-pressed NdFeB improves the mechanical strength of the third central magnet 331 and makes it less prone to breakage. This allows the sound-generating device 100 to not only achieve an ultra-thin magnetic circuit design but also increase the magnet volume of the magnetic circuit system 3, thereby improving the sound-generating performance of the sound-generating device 100. Furthermore, it makes the structure of the magnetic circuit system 3 more reliable and less prone to breakage. This not only improves the stability of the product but also meets higher performance requirements, compensating for the performance loss caused by the thinner and lighter design of the sound-generating device 100.

[0111] It is understood that the second receiving space 312 of the magnetic yoke 31 can be a groove structure or a through-hole structure, and is not limited here. Optionally, the second receiving space 312 is a groove structure provided on the first side of the magnetic yoke 31. In this embodiment, as... Figure 3 , Figure 4 and Figure 6 As shown, the second accommodating space 312 is a through-hole structure that passes through the first and second sides of the magnetic yoke 31.

[0112] Optionally, the second protrusion 334 is flush with the side of the magnetic yoke 31 facing away from the second central magnetic part 33. In this embodiment, as... Figure 3 and Figure 4 As shown, the side of the second protrusion 334 facing away from the second central magnetic plate 332 is flush with the second side of the magnetic yoke 31.

[0113] In one embodiment, the magnetic yoke 31 has a third receiving space corresponding to the first side magnetic part 34, and the first side magnetic part 34 has a third protrusion extending into the third receiving space. The first side magnetic part 34 and the magnetic yoke 31 are integrally hot-pressed to make the outer periphery of the third protrusion fit against the inner wall of the third receiving space. The third receiving space is a groove structure provided in the magnetic yoke 31; or, the third receiving space is a through hole structure that penetrates the magnetic yoke 31; or, the third receiving space penetrates the magnetic yoke 31, and the third protrusion is flush with the side of the magnetic yoke 31 facing away from the first side magnetic part 34.

[0114] In this embodiment, the magnetic yoke 31 has a first side facing the diaphragm assembly 21 and a second side away from the diaphragm assembly 21. By providing a third receiving space on the magnetic yoke 31 and providing a third protrusion on the first side magnetic part 34, the third protrusion is confined within the third receiving space. This increases the magnet volume of the first side magnet 341 of the first side magnetic part 34, increases the B value, and improves performance.

[0115] Understandably, the first magnet 341 of the first side magnetic part 34 has a third protrusion on the side facing away from the first magnetic guide plate 342. Optionally, the first side magnetic part 34 and the magnetic yoke 31 are integrally hot-pressed to make the outer periphery of the third protrusion fit snugly against the inner wall of the third accommodating space. This allows the first magnet 341 of the first side magnetic part 34 and the magnetic yoke 31 to achieve "zero fit", making the connection between the first magnet 341 and the magnetic yoke 31 almost completely fit, eliminating assembly tolerances and material tolerances, and maximizing the volume of the first magnet 341.

[0116] Optionally, the first side magnet 341 is made of neodymium iron boron (NdFeB). By integrally hot-pressing the first side magnet 341 with the yoke 31, the outer periphery of the third protrusion of the first side magnet 341 fits snugly against the inner wall of the third accommodating space of the yoke 31. This achieves a near-perfect fit between the first side magnet 341 and the yoke 31, eliminating assembly and material tolerances and maximizing the volume of the first side magnet 341. Furthermore, compared to sintered NdFeB, hot-pressed NdFeB improves the mechanical strength of the first side magnet 341 and makes it less prone to breakage. This allows the sound-generating device 100 to achieve an ultra-thin magnetic circuit design while increasing the magnet volume of the magnetic circuit system 3, thereby improving the sound-generating performance of the sound-generating device 100. It also ensures the structural reliability of the magnetic circuit system 3, making it less prone to breakage. This not only improves the product's stability but also meets higher performance requirements, compensating for the performance loss resulting from the thinner and lighter design of the sound-generating device 100.

[0117] It is understood that the third accommodating space of the magnetic yoke 31 can be a groove structure or a through-hole structure, and is not limited here. Optionally, the third accommodating space is a groove structure provided on the first side of the magnetic yoke 31. In this embodiment, the third accommodating space is a through-hole structure that passes through the first and second sides of the magnetic yoke 31.

[0118] Optionally, the third protrusion is flush with the side of the magnetic yoke 31 facing away from the first side magnetic part 34. In this embodiment, the side of the third protrusion facing away from the first side magnetic plate 342 is flush with the second side of the magnetic yoke 31.

[0119] It should be noted that the magnetic yoke 31 has a receiving space for at least one of the first central magnet 321 of the first central magnetic part 32, the third central magnet 331 of the second central magnetic part 33, and the first side magnet 341 of the first side magnetic part 34. At least one of the first central magnet 321 of the first central magnetic part 32, the third central magnet 331 of the second central magnetic part 33, and the first side magnet 341 of the first side magnetic part 34 has a protrusion corresponding to the receiving space, so that the protrusion is confined within the receiving space.

[0120] In this embodiment, as Figures 3 to 6 As shown, the magnetic yoke 31 has a first receiving space 311 and a second receiving space 312. The first central magnet 321 has a first protrusion 323 extending into the first receiving space 311, and the third central magnet 331 has a second protrusion 334 extending into the second receiving space 312. Optionally, the first central magnet 321 and the third central magnet 331 are integrally hot-pressed with the magnetic yoke 31. This allows the outer periphery of the first protrusion 323 to fit snugly against the inner wall of the first receiving space 311, and the outer periphery of the second protrusion 334 to fit snugly against the inner wall of the second receiving space 312. This ensures that the first central magnet 321 of the first central magnet 32 ​​and the third central magnet 331 of the second central magnet 33 are "zero-fit" with the magnetic yoke 31, and the connection between the first central magnet 321 and the third central magnet 331 and the magnetic yoke 31 is almost completely fitted, eliminating assembly tolerances and material tolerances. This maximizes the volume of the first central magnet 321 and the third central magnet 331, which is not limited here.

[0121] Understandably, compared to normal assembly where there are assembly tolerances and material tolerances, especially at some R-corner locations, the tolerances are generally quite large. The sound-generating device 100 of this invention, by providing a receiving space in the magnetic yoke 31, and by providing a protrusion extending into the receiving space of at least one of the following: the first central magnet 321 of the first central magnetic part 32, the third central magnet 331 of the second central magnetic part 33, and the first side magnet 341 of the first side magnetic part 34; and further by using neodymium iron boron material for the magnet, allowing the magnet and the magnetic yoke 31 to be integrally hot-pressed, ensures that the outer periphery of the protrusion of the magnet fits snugly against the inner wall of the receiving space of the magnetic yoke 31, achieving a "zero-fit" connection between the magnet and the magnetic yoke 31. The connection with the magnetic yoke 31 is almost perfectly fitted, eliminating assembly and material tolerances and maximizing the magnet's volume. Moreover, compared to sintered NdFeB, hot-pressed NdFeB improves the magnet's mechanical strength and makes it less prone to breakage. This allows the sound-generating device 100 to not only achieve an ultra-thin magnetic circuit design but also increase the magnet volume of the magnetic circuit system 3, thereby improving the sound-generating performance of the sound-generating device 100. Furthermore, it ensures the structural reliability of the magnetic circuit system 3, making it less prone to breakage. This not only improves the product's stability but also meets higher performance requirements, compensating for the performance loss caused by the thinner and lighter design of the sound-generating device 100.

[0122] In this embodiment, multiple voice coils 221 in each voice coil group are arranged sequentially along a first direction. Each voice coil 221 has two first long straight sides extending along the first direction and a first short side connecting the two first long straight sides.

[0123] Optionally, adjacent voice coils 221 in each voice coil group are arranged close together on their adjacent sides. In this embodiment, the two first short sides of adjacent voice coils 221 in each voice coil group are arranged close together. It should be noted that the voice coil wires of adjacent voice coils 221 have an insulating layer on their outer side. Therefore, when the adjacent first short sides of two voice coils 221 are arranged close together, the voice coil wires of the adjacent first short sides are insulated from each other.

[0124] To further enable the voice coils 221 to vibrate synchronously, optionally, the adjacent sides of two voice coils 221 in each voice coil group are bonded together. That is, the two first short sides of two adjacent voice coils 221 in each voice coil group are bonded together.

[0125] Of course, in other embodiments, there is a gap between the adjacent sides of two voice coils 221 in each voice coil group. That is, there is a gap between the two first short sides of two adjacent voice coils 221 in each voice coil group. It should be noted that the gap between the two first short sides of two voice coils 221 should not be too large. If the gap is too large, it will increase the volume and affect the magnetic field driving force of the magnetic circuit system 3 on the voice coils 221.

[0126] In this embodiment, all voice coils 221 are annular voice coils formed by winding wire. It is understood that all voice coils 221 are integral voice coils extending along a first direction, formed by winding the same wire. Each voice coil 221 has a height along a third direction; optionally, the height of each voice coil 221 is greater than or equal to its thickness. It should be noted that the thickness of each voice coil 221 is the distance between the inner and outer wall surfaces of the annular voice coil.

[0127] In one embodiment, the magnetic circuit system 3 further includes a second side magnetic part 35 disposed on the yoke 31, the second side magnetic part 35 being located between two adjacent voice coils 221 arranged along the extension direction of the first side 11.

[0128] In this embodiment, as Figures 2 to 6 As shown, the magnetic circuit system 3 includes a magnetic yoke 31 and a first central magnetic part 32, a second central magnetic part 33, a first side magnetic part 34 and a second side magnetic part 35 disposed on the magnetic yoke 31. The first central magnetic part 32 includes a plurality of parts, each of which corresponds to a voice coil 221 and is located inside the voice coil 221. The second central magnetic part 33 is located between two adjacent voice coil groups along the second direction. The first side magnetic part 34 is located outside the voice coil assembly 22. The second side magnetic part 35 is located between two adjacent voice coils 221 arranged along the extension direction of the first side 11.

[0129] Understandably, by setting the second side magnet 35 so that it is located between two adjacent voice coils 221 arranged along the extension direction of the first side 11, the magnet volume can be effectively increased, the B value can be increased, and the acoustic performance of the sound-generating device 100 can be improved.

[0130] Optionally, the second fixing part 2115 is connected to the first central magnet 32, the second central magnet 33, or the second side magnet 35. In this embodiment, when the second fixing part 2115 is connected to the first central magnet 32 ​​of the magnetic circuit system 3, the diaphragm assembly 21 is spaced apart from the second central magnet 33, the first side magnet 34, and the second side magnet 35, and a vibration space is formed between the diaphragm assembly 21 and the second central magnet 33, the first side magnet 34, and the second side magnet 35. When the second fixing part 2115 is connected to the second central magnet 33 of the magnetic circuit system 3, the diaphragm assembly 21 is spaced apart from the first central magnet 32, the first side magnet 34, and the second side magnet 35, and a vibration space is formed between the diaphragm assembly 21 and the first central magnet 32, the first side magnet 34, and the second side magnet 35. When the second fixing part 2115 is connected to the second side magnetic part 35 of the magnetic circuit system 3, the diaphragm assembly 21 is spaced apart from the first central magnetic part 32, the second central magnetic part 33 and the first side magnetic part 34, and a vibration space is formed between the diaphragm assembly 21 and the first central magnetic part 32, the second central magnetic part 33 and the first side magnetic part 34, which is not limited here.

[0131] It should be noted that when the number of voice coil groups along the second direction in the voice coil assembly 22 is 3, the voice coil 221 of the middle voice coil group is located within the magnetic gap 36 formed by the first central magnet 32 ​​and the two second central magnets 33 and the second side magnets 35 along the second direction, which is not limited here. That is, the first central magnet 32 ​​in the voice coil 221 of the middle voice coil group has second central magnets 33 respectively provided on both sides along the second direction. The voice coil 221 adjacent to the first side 11 is located within the magnetic gap 36 formed by the first central magnet 32 ​​and the first side magnets 34, the second side magnets 35 and the second central magnets 33, which is not limited here.

[0132] It should be noted that when the voice coil assembly 22 includes four voice coils 221 arranged in an array, each first central magnetic part 32 of the magnetic circuit system 3 is spaced apart from the first side magnetic part 34, the second side magnetic part 35, and the second central magnetic part 33 to form a magnetic gap 36. When there are more than four voice coils 221 arranged in an array in the voice coil assembly 22, such as six, eight, or nine voice coils 221, the voice coils 221 adjacent to the first side 11 are located within the magnetic gap 36 formed by the first central magnetic part 32 and the first side magnetic part 34, the second side magnetic part 35, and the second central magnetic part 33, while the voice coil 221 located in the middle is located within the magnetic gap 36 formed by the first central magnetic part 32 and the two second central magnetic parts 33 and the second side magnetic part 35 along the second direction. This is not limited here.

[0133] Understandably, each of the first central magnetic portions 32 adjacent to the first side 11 is spaced apart from the first side magnetic portion 34, the second side magnetic portion 35 and the second central magnetic portion 33 to form a magnetic gap 36.

[0134] Optionally, the first side magnet 34 includes two parts, both of which extend along the extension direction of the first side 11, and the two first side magnets 34 are respectively disposed on opposite sides of the voice coil assembly 22 along the extension direction of the second side 12.

[0135] In one embodiment, the second side magnetic part 35 includes a second side magnet 351 and a second side magnetic guide plate 352 stacked together, and the second side magnet 351 is connected to the magnetic yoke 31. In this embodiment, the second side magnet 351 and the second side magnetic guide plate 352 of the second side magnetic part 35 may optionally be plate-shaped and have similar outlines, such as rectangular or racetrack-shaped, which is not limited here.

[0136] In one embodiment, the first central magnet 321, the first central magnetic plate 322, and the second central magnet of the first central magnetic section 32 are optionally stacked sequentially along a third direction. The third central magnet 331 and the second central magnetic plate 332 of the second central magnetic section 33 are optionally stacked sequentially along a third direction. The first side magnet 341 and the first side magnetic plate 342 of the first side magnetic section 34 are optionally stacked sequentially along a third direction. The second side magnet 351 and the second side magnetic plate 352 of the second side magnetic section 35 are optionally stacked sequentially along a third direction.

[0137] Optionally, the first central magnet 321, the second central magnet, the third central magnet 331, the first side magnet 341 and the second side magnet 351 are all magnetized along the vibration direction of the vibration system 2, and the magnetization direction of the first central magnet 321 is opposite to the magnetization direction of the second central magnet, the third central magnet 331, the first side magnet 341 and the second side magnet 351.

[0138] In another embodiment, such as Figures 2 to 6 As shown, the first central magnetic section 32 includes a first central magnet 321 and a first central magnetic guide plate 322 stacked sequentially along a third direction. The second central magnetic section 33 includes a third central magnet 331, a second central magnetic guide plate 332, and a fourth central magnet 333 stacked sequentially along a third direction. The first side magnetic section 34 includes a first side magnet 341 and a first side magnetic guide plate 342 stacked sequentially along a third direction. The second side magnetic section 35 includes a second side magnet 351 and a second side magnetic guide plate 352 stacked sequentially along a third direction.

[0139] Optionally, the first central magnet 321, the third central magnet 331, the fourth central magnet 333, the first side magnet 341 and the second side magnet 351 are all magnetized along the vibration direction of the vibration system 2, and the magnetization direction of the first central magnet 321 and the fourth central magnet 333 is opposite to the magnetization direction of the third central magnet 331, the first side magnet 341 and the second side magnet 351.

[0140] In another embodiment, the second side magnetic section 35 includes a second side magnet 351, a second side magnetic guide plate 352, and a third side magnet stacked together, with the second side magnet 351 connected to the magnetic yoke 31. Optionally, both the second side magnet 351 and the third side magnet are magnetized along the vibration direction of the vibration system 2, but in opposite directions. This makes the second side magnetic section 35 a counter-magnetic structure, which effectively increases the magnet volume, increases the B value, and thus improves performance.

[0141] In this embodiment, the second side magnet 351, the second side magnetic plate 352 and the third side magnet of the second side magnetic part 35 may optionally be plate-shaped and have similar outlines, such as rectangular or racetrack-shaped, which is not limited here.

[0142] To reduce the thickness of the sound-generating device 100 along a third direction, in one embodiment, the diaphragm assembly 21 of the vibration system 2 is connected to the second side magnet 35 of the magnetic circuit system 3. In this embodiment, the extension 2114 is provided with a second fixing part 2115 corresponding to the second side magnet 35, the second fixing part 2115 is connected to the third side magnet, and the vibrating plate 212 is provided with a hollow hole 2121 corresponding to the second side magnet 35.

[0143] Understandably, the diaphragm assembly 21 is positioned opposite and spaced apart from the first central magnet 32, the second central magnet 33, and the first side magnet 34 of the magnetic circuit system 3, which facilitates the voice coil 221 driving the diaphragm assembly 21 to vibrate and produce sound. Optionally, the second fixing part 2115 of the diaphragm assembly 21 is connected to the third side magnet of the second side magnet 35.

[0144] In one embodiment, the first central magnetic section 32 includes a first central magnet 321, a first central magnetic plate 322, and a second central magnet stacked sequentially along a third direction. The second central magnetic section 33 includes a third central magnet 331 and a second central magnetic plate 332 stacked sequentially along a third direction. The first side magnetic section 34 includes a first side magnet 341 and a first side magnetic plate 342 stacked sequentially along a third direction. The second side magnetic section 35 includes a second side magnet 351, a second side magnetic plate 352, and a third side magnet stacked sequentially along a third direction.

[0145] Optionally, the first central magnet 321, the second central magnet, the third central magnet 331, the first side magnet 341, the second side magnet 351 and the third side magnet are all magnetized along the vibration direction of the vibration system 2, and the magnetization direction of the first central magnet 321 and the third side magnet is opposite to the magnetization direction of the second central magnet, the third central magnet 331, the first side magnet 341 and the second side magnet 351.

[0146] In another embodiment, the first central magnetic section 32 includes a first central magnet 321 and a first central magnetic plate 322 stacked sequentially along a third direction. The second central magnetic section 33 includes a third central magnet 331, a second central magnetic plate 332, and a fourth central magnet 333 stacked sequentially along a third direction. The first side magnetic section 34 includes a first side magnet 341 and a first side magnetic plate 342 stacked sequentially along a third direction. The second side magnetic section 35 includes a second side magnet 351, a second side magnetic plate 352, and a third side magnet stacked sequentially along a third direction.

[0147] Optionally, the first central magnet 321, the third central magnet 331, the fourth central magnet 333, the first side magnet 341, the second side magnet 351, and the third side magnet are all magnetized along the vibration direction of the vibration system 2, and the magnetization direction of the first central magnet 321, the fourth central magnet 333, and the third side magnet is opposite to the magnetization direction of the third central magnet 331, the first side magnet 341, and the second side magnet 351.

[0148] In one embodiment, the magnetic yoke 31 has a fourth receiving space corresponding to the second side magnetic part 35, and the second side magnetic part 35 has a fourth protrusion extending into the fourth receiving space. The second side magnetic part 35 and the magnetic yoke 31 are integrally hot-pressed to make the outer periphery of the fourth protrusion fit against the inner wall of the fourth receiving space. The fourth receiving space is a groove structure provided in the magnetic yoke 31; or, the fourth receiving space is a through hole structure that penetrates the magnetic yoke 31; or, the fourth receiving space penetrates the magnetic yoke 31, and the fourth protrusion is flush with the side of the magnetic yoke 31 facing away from the second side magnetic part 35.

[0149] In this embodiment, the magnetic yoke 31 has a first side facing the diaphragm assembly 21 and a second side away from the diaphragm assembly 21. By providing a fourth receiving space on the magnetic yoke 31 and providing a fourth protrusion on the second side magnetic part 35, the fourth protrusion is confined within the fourth receiving space. This increases the magnet volume of the second side magnet 351 of the second side magnetic part 35, increases the B value, and improves performance.

[0150] Understandably, the second magnet 351 of the second side magnetic part 35 has a fourth protrusion on the side facing away from the second magnetic guide plate 352. Optionally, the second magnet 35 and the yoke 31 are integrally hot-pressed to make the outer periphery of the fourth protrusion fit snugly against the inner wall of the fourth accommodating space. This allows the second magnet 351 of the second side magnetic part 35 and the yoke 31 to achieve "zero fit", making the connection between the second magnet 351 and the yoke 31 almost completely fit, eliminating assembly tolerances and material tolerances, and maximizing the volume of the second magnet 351.

[0151] Optionally, the second magnet 351 is made of neodymium iron boron (NdFeB). By integrally hot-pressing the second magnet 351 with the yoke 31, the outer periphery of the fourth protrusion of the second magnet 351 fits snugly against the inner wall of the fourth accommodating space of the yoke 31. This achieves a near-perfect fit between the second magnet 351 and the yoke 31, eliminating assembly and material tolerances and maximizing the volume of the second magnet 351. Furthermore, compared to sintered NdFeB, hot-pressed NdFeB improves the mechanical strength of the second magnet 351 and makes it less prone to breakage. This allows the sound-generating device 100 to achieve an ultra-thin magnetic circuit design while increasing the magnet volume of the magnetic circuit system 3, thereby improving the sound-generating performance of the device 100. It also ensures the structural reliability of the magnetic circuit system 3, making it less prone to breakage. This not only improves the product's stability but also meets higher performance requirements, compensating for the performance loss resulting from the thinner and lighter design of the sound-generating device 100.

[0152] It is understood that the fourth accommodating space of the magnetic yoke 31 can be a groove structure or a through-hole structure, and is not limited here. Optionally, the fourth accommodating space is a groove structure provided on the first side of the magnetic yoke 31. In this embodiment, the fourth accommodating space is a through-hole structure that passes through the first and second sides of the magnetic yoke 31.

[0153] Optionally, the fourth protrusion is flush with the side of the magnetic yoke 31 facing away from the second side magnetic part 35. In this embodiment, the side of the fourth protrusion facing away from the second side magnetic plate 352 is flush with the second side of the magnetic yoke 31.

[0154] It should be noted that the magnetic yoke 31 has a receiving space for at least one of the first central magnet 321 of the first central magnetic part 32, the third central magnet 331 of the second central magnetic part 33, the first side magnet 341 of the first side magnetic part 34, and the second side magnet 351 of the second side magnetic part 35. At least one of the first central magnet 321 of the first central magnetic part 32, the third central magnet 331 of the second central magnetic part 33, the first side magnet 341 of the first side magnetic part 34, and the second side magnet 351 of the second side magnetic part 35 has a protrusion corresponding to the receiving space, such that the protrusion is confined within the receiving space, which is not limited here.

[0155] In one embodiment, the first side magnetic portion 34 and the second side magnetic portion 35 of the magnetic circuit system 3 may be integrally formed. It is understood that there are two first side magnetic portions 34, which are respectively disposed on opposite sides of the voice coil assembly 22 along the second direction.

[0156] Optionally, both first side magnetic portions 34 extend along a first direction, and the second side magnetic portion 35 extends along a second direction. In this embodiment, the two ends of the second side magnetic portion 35 along the second direction are respectively connected to the two first side magnetic portions 34 to form an integral structural component. This makes the two first side magnetic portions 34 and the second side magnetic portion 35 form an "I"-shaped structure, which simplifies the structural design of the magnetic circuit system 3, improves assembly efficiency, and effectively increases the magnet volume, increases the B value, and improves performance.

[0157] In this embodiment, the first side magnetic portion 34 includes a first side magnet 341 and a first side magnetic guide plate 342 stacked together, and the second side magnetic portion 35 includes a second side magnet 351 and a second side magnetic guide plate 352 stacked together. Optionally, the first side magnet 341 of the first side magnetic portion 34 and the second side magnet 351 of the second side magnetic portion 35 are integrally formed, and the first side magnetic guide plate 342 of the first side magnetic portion 34 and the second side magnetic guide plate 352 of the second side magnetic portion 35 are integrally formed.

[0158] Alternatively, the first side magnetic portion 34 includes a first side magnet 341 and a first side magnetic guide plate 342 stacked together, and the second side magnetic portion 35 includes a second side magnet 351, a second side magnetic guide plate 352, and a third side magnet stacked together. Optionally, the first side magnet 341 of the first side magnetic portion 34 and the second side magnet 351 of the second side magnetic portion 35 are integrally formed, and the first side magnetic guide plate 342 of the first side magnetic portion 34 and the second side magnetic guide plate 352 of the second side magnetic portion 35 are integrally formed.

[0159] In another embodiment, the second central magnet 33 and the second side magnet 35 of the magnetic circuit system 3 may be integrally formed. It is understood that the second central magnet 33, located between two adjacent voice coil groups, extends along a first direction, and the second side magnet 35 extends along a second direction; the second central magnet 33 and the second side magnet 35 are connected to form an integral structural component.

[0160] When the voice coil assembly 22 includes four voice coils 221 arranged in an array, the second central magnet 33 and the second side magnet 35 are connected to form an integral structure, so that the second central magnet 33 and the second side magnet 35 form a cross-shaped structure. This makes the structural design of the magnetic circuit system 3 simpler, improves assembly efficiency, and can also effectively increase the magnet volume, increase the B value, and improve performance.

[0161] In this embodiment, the second central magnetic part 33 includes a third central magnet 331 and a second central magnetic guide plate 332 stacked together, and the second side magnetic part 35 includes a second side magnet 351 and a second side magnetic guide plate 352 stacked together. Optionally, the third central magnet 331 of the second central magnetic part 33 and the second side magnet 351 of the second side magnetic part 35 are integrally formed, and the second central magnetic guide plate 332 of the second central magnetic part 33 and the second side magnetic guide plate 352 of the second side magnetic part 35 are integrally formed.

[0162] Alternatively, the second central magnetic part 33 includes a third central magnet 331, a second central magnetic plate 332, and a fourth central magnet 333 stacked together, and the second side magnetic part 35 includes a second side magnet 351, a second side magnetic plate 352, and a third side magnet stacked together. Optionally, the third central magnet 331 of the second central magnetic part 33 and the second side magnet 351 of the second side magnetic part 35 are integrally formed, the second central magnetic plate 332 of the second central magnetic part 33 and the second side magnetic plate 352 of the second side magnetic part 35 are integrally formed, and the fourth central magnet 333 of the second central magnetic part 33 and the third side magnet of the second side magnetic part 35 are integrally formed.

[0163] Of course, in other embodiments, the second central magnetic part 33 includes a third central magnet 331 and a second central magnetic guide plate 332 stacked together, and the second side magnetic part 35 includes a second side magnet 351, a second side magnetic guide plate 352 and a third side magnet stacked together. Optionally, the third central magnet 331 of the second central magnetic part 33 and the second side magnet 351 of the second side magnetic part 35 are integrally formed, and the second central magnetic guide plate 332 of the second central magnetic part 33 and the second side magnetic guide plate 352 of the second side magnetic part 35 are integrally formed.

[0164] Alternatively, the second central magnetic part 33 includes a third central magnet 331, a second central magnetic plate 332, and a fourth central magnet 333 stacked together, and the second side magnetic part 35 includes a second side magnet 351 and a second side magnetic plate 352 stacked together. Optionally, the third central magnet 331 of the second central magnetic part 33 and the second side magnet 351 of the second side magnetic part 35 are integrally formed, and the second central magnetic plate 332 of the second central magnetic part 33 and the second side magnetic plate 352 of the second side magnetic part 35 are integrally formed.

[0165] In one embodiment, the vibration system 2 further includes a centering component 23, which includes a first support plate 231 and a second support plate 232. The first support plate 231 includes an outer fixing part 2311, an inner fixing part 2312, and a spring arm part 2313 connecting the outer fixing part 2311 and the inner fixing part 2312. The outer fixing part 2311 is connected to the outer shell 1. The inner fixing part 2312 includes at least one fixed connection part 2314. The fixed connection part 2314 connects two adjacent voice coils 221 that are spaced apart along the extension direction of the second side 12. The second support plate 232 connects two adjacent voice coils 221 that are arranged along the extension direction of the first side 11.

[0166] In this embodiment, as Figure 1 , Figure 2 , Figures 4 to 6 As shown, by setting the centering component 23, the first branch 231 of the centering component 23 can be used to center the voice coil 221, and the cooperation of the first branch 231 and the second branch 232 can be used to connect and conduct multiple voice coils 221 in the voice coil component 22 to the external circuit.

[0167] Understandable, such as Figure 1 , Figure 2 , Figures 4 to 6 As shown, the outer fixing part 2311 of the first support piece 231 is connected to the outer shell 1, and the fixing connection part 2314 of the inner fixing part 2312 is connected to the voice coil 221. In this way, the first support piece 231 is used to center the voice coil 221.

[0168] In this embodiment, the outer fixing part 2311 of the first support piece 231 is provided with an outer solder pad, which is used to connect and conduct with an external circuit. The fixing connection part 2314 of the inner fixing part 2312 of the first support piece 231 is provided with an inner solder pad, which is electrically connected to the lead wire of the voice coil 221. In this way, the first support piece 231 can both center the voice coil 221 and connect the voice coil 221 to the external circuit.

[0169] Understandably, the first support piece 231 can be selected as a centering support piece. The spring arm portion 2313 of the first support piece 231 can deform during the vibration of the voice coil 221. To ensure the deformation capability of the spring arm portion 2313 of the first support piece 231, the spring arm portion 2313 may optionally have at least one bend, which is not limited here. In this embodiment, the outer fixing portion 2311, the spring arm portion 2313, and the inner fixing portion 2312 of the first support piece 231 can be selected as an integrally formed structure.

[0170] Optionally, the first support piece 231 comprises two. In this embodiment, as... Figure 2 and Figure 6As shown, the two first support plates 231 are symmetrically arranged and correspond to the two second sides 12 respectively. It can be understood that by placing the first support plates 231 on the two second sides 12 of the outer casing 1, the magnetic circuit system 3 avoids the need for clearance or notches to accommodate the first support plates 231. Simultaneously, placing the two first support plates 231 on the short axis of the sound-generating device 100 reduces the volume occupied, thereby preventing the first support plates 231 from occupying the volume of the long axis of the sound-generating device 100, thus ensuring the volume of the magnetic circuit system 3.

[0171] In this embodiment, no magnet structures are provided at the two second sides 12 positions of the magnetic circuit system 3 corresponding to the sound-generating device 100. Since the short axis region (i.e., the first short side) of the voice coil 221 corresponding to the second side 12 is far from the magnetic field, the proportion of the short axis region of the voice coil 221 far from the magnetic field is less than 15%, so the BL loss is controlled within 15%. Furthermore, the long axis (first long straight side) of the voice coil 221 is made as close as possible to the first central magnet 32, the second central magnet 33, and the first side magnet 34 to improve the utilization rate of the magnetic circuit. At the same time, it can provide installation space for the two first supports 231.

[0172] Understandably, the voice coil assembly 22 includes multiple voice coil groups along the second direction, that is, the second side 12 of the housing 1 corresponds to multiple voice coils 221 along the second direction. In order to connect the first support 231 with the multiple voice coils 221 adjacent to the second side 12 along the second direction, the inner fixing portion 2312 of the first support 231 includes at least one fixing connection portion 2314. Optionally, the fixing connection portion 2314 connects two adjacent voice coils 221 that are spaced apart along the extending direction of the second side 12.

[0173] In this embodiment, as Figure 2 and Figure 6 As shown, by setting a second branch 232, the second branch 232 extends along the first direction. In this way, the second branch 232 connects two adjacent voice coils 221 arranged along the extension direction of the first side 11, thereby connecting and conducting two adjacent voice coils 221 in each voice coil group along the first direction.

[0174] Understandably, the number of second sprockets 232 can be one or more. Optionally, when the number of voice coils 221 along the first direction in each voice coil group is N2 (N2≥2), the number of second sprockets 232 corresponding to each voice coil group is N2-1, which is not limited here.

[0175] It should be noted that when the number of voice coil groups along the second direction in the voice coil assembly 22 is N1 (N1≥2), and the number of voice coils 221 along the first direction in each voice coil group is N2 (N2≥2), the number of second supports 232 in the centering assembly 23 is N1. (N2-1), not limited here. The number of first support pieces 231 in the centering assembly 23 can be one or two. When there is one first support piece 231, the outer fixing part 2311 of the first support piece 231 has a ring-shaped structure similar to the shape and outline of the outer shell 1. At this time, the spring arm part 2313 and the inner fixing part 2312 of the first support piece 231 are at least two, and are respectively located on the second side 12 of the outer shell 1. When there are two first support pieces 231, the two first support pieces 231 are symmetrically arranged and respectively corresponding to the two second sides 12, not limited here.

[0176] In one embodiment, the magnetic circuit system 3 further includes a second side magnetic part 35 disposed on the magnetic yoke 31. The second side magnetic part 35 is located between two adjacent voice coils 221 arranged along the extension direction of the first side 11. The number of voice coils 221 along the extension direction of the second side 12 is at least three. The second side magnetic part 35 includes a plurality of second side magnetic parts 35, and the plurality of second side magnetic parts 35 are spaced apart along the extension direction of the second side 12. A second support piece 232 is disposed between two adjacent second side magnetic parts 35.

[0177] In this embodiment, when the number of voice coil groups along the second direction in the voice coil assembly 22 is greater than or equal to 3, the number of second side magnets 35 can be multiple, and the multiple second side magnets 35 are spaced apart along the extension direction of the second side 12. It can be understood that by setting multiple second supports 232, such that a second support 232 is provided between two adjacent second side magnets 35, the multiple voice coils 221 of the voice coil assembly 22 can be connected and made conductive, which is not limited here.

[0178] Optionally, multiple voice coils 221 in the voice coil assembly 22 are connected in series; or, multiple voice coils 221 in the voice coil assembly 22 are connected in parallel.

[0179] In this embodiment, the multiple voice coil groups along the second direction in the voice coil assembly 22 can be connected in series or in parallel. The multiple voice coils 221 along the first direction in each voice coil group can be connected in series, which is not limited here.

[0180] It should be noted that, in order to further increase the magnet volume of the magnetic circuit system 3, the second support plate 232 is omitted. A conductive part can be provided on the diaphragm assembly 21 of the vibration system 2. Two adjacent voice coils 221 in each voice coil group along the first direction are connected to the conductive part on the diaphragm assembly 21, thus achieving electrical connection. It is understood that the conductive part can be a conductive coating applied to the diaphragm assembly 21; or, the conductive part can be conductive adhesive, a metal conductive layer, an FPCB, or a solder pad, etc., which are not limited here. By electrically connecting multiple voice coils 221 to the external circuit through the conductive part on the diaphragm assembly 21, the space occupied by the second support plate 232 can be saved, thereby increasing the magnet volume in the magnetic circuit system 3, improving the product BL value of the sound-generating device 100, and also saving the Z-direction space of the sound-generating device 100.

[0181] In this embodiment, the outer casing 1 is provided with a conductive element, and the outer pad of the outer fixing part 2311 of the first support piece 231 is connected to the conductive element for conduction. This enables the external circuit to be connected and conductive to the multiple voice coils 221 of the voice coil assembly 22.

[0182] In this embodiment, the outer shell 1 can be a plastic shell or a metal shell. To reduce the volume occupied by the outer shell 1, it can be a metal shell. Since the wall thickness of a metal shell can be made thinner while maintaining corresponding structural strength, the cavity structure inside the outer shell 1 can be effectively increased within the same size, thereby correspondingly increasing the volume of the magnetic circuit system 3 to improve the magnetic field strength, increase the BL value, and thus improve the acoustic performance. Of course, in other embodiments, the outer shell 1 can also be a plastic shell, which is not limited here.

[0183] 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.

[0184] Optionally, the electronic device of the present invention can be a portable mobile electronic product such as a mobile phone or tablet, or a wearable device such as a watch, VR, or AR, etc., and is not specifically limited thereto. Of course, the electronic device can also be any other electronic device, etc., and is not limited thereto.

[0185] The above description is merely an optional embodiment of the present invention and does not limit the scope of the present invention. Any equivalent structural transformations made based on the content of the present invention specification and drawings under the concept of the present invention, or direct / indirect applications in other related technical fields, are included within the protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: The outer casing has a first side and a second side that are connected and set at an included angle; A vibration system, comprising a diaphragm assembly and a voice coil assembly connected to the diaphragm assembly, the voice coil assembly comprising a plurality of voice coils arranged in an array along an extension direction of a first side and an extension direction of a second side; and A magnetic circuit system is connected to the housing. The magnetic circuit system has a magnetic gap corresponding to each voice coil. The magnetic circuit system includes a magnetic yoke and a first central magnetic part, a second central magnetic part, and a first side magnetic part disposed on the magnetic yoke. The first central magnetic part includes a plurality of parts. Each first central magnetic part is located in a voice coil corresponding to it. The second central magnetic part is located between two adjacent voice coils arranged along the extension direction of the second side. The first side magnetic part is located on the outside of the voice coil assembly. The diaphragm assembly includes a diaphragm and a vibrating plate. The diaphragm includes a ring-shaped frame portion and an extension portion located inside the frame portion. Both ends of the extension portion are connected to the frame portion to form a hollow area between the extension portion and the frame portion. The frame portion is provided with a first folded ring and a first fixing portion connected to the outside of the first folded ring. The first fixing portion is connected to the outer shell. The extension portion is provided with a second fixing portion and a second folded ring surrounding the second fixing portion. The second fixing portion is connected to the first central magnet portion or the second central magnet portion. The vibrating plate is connected to the diaphragm to cover the hollow area, and the vibrating plate is provided with hollow holes corresponding to the second fixing portion and the second folded ring.

2. The sound-generating device as described in claim 1, characterized in that, The vibrating plate includes a first region connected to the diaphragm and a second region corresponding to the hollowed-out region, wherein the first region is a pressing edge structure; Wherein, the sum of the thickness of the first region along the vibration direction of the vibration system and the thickness of the diaphragm along the vibration direction of the vibration system is equal to the thickness of the second region along the vibration direction of the vibration system.

3. The sound-generating device as described in claim 1, characterized in that, The first central magnetic part includes a first central magnet, a first central magnetic plate and a second central magnet stacked in sequence, and the first central magnet is connected to the magnetic yoke; The second central magnetic part includes a third central magnet and a second central magnetic plate stacked in sequence, wherein the third central magnet is connected to the magnetic yoke; The first side magnetic part includes a first side magnet and a first side magnetic plate stacked together, and the first side magnet is connected to the magnetic yoke; The first central magnet, the second central magnet, the third central magnet, and the first side magnet are all magnetized along the vibration direction of the vibration system, and the magnetization direction of the first central magnet is opposite to that of the second central magnet, the third central magnet, and the first side magnet. The extension portion is provided with a second fixing portion corresponding to each of the first central magnetic portions, and each of the second fixing portions is connected to a second central magnet. The vibrating plate is provided with a hollow hole corresponding to each of the first central magnetic portions.

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 in sequence, and the first central magnet is connected to the magnetic yoke; The second central magnetic part includes a third central magnet, a second central magnetic plate and a fourth central magnet stacked in sequence, wherein the third central magnet is connected to the magnetic yoke; The first side magnetic part includes a first side magnet and a first side magnetic plate stacked together, and the first side magnet is connected to the magnetic yoke; The first central magnet, the third central magnet, the fourth central magnet, and the first side magnet are all magnetized along the vibration direction of the vibration system, and the magnetization directions of the first central magnet and the fourth central magnet are opposite to the magnetization directions of the third central magnet and the first side magnet. The extension portion is provided with a second fixing portion corresponding to the second central magnetic portion, the second fixing portion is connected to the fourth central magnet, and the vibrating plate is provided with the hollow hole corresponding to the second central magnetic portion.

5. The sound-generating device as described in claim 1, characterized in that, The magnetic circuit system further includes a second side magnetic part disposed on the magnetic yoke, the second side magnetic part being located between two adjacent voice coils arranged along the extension direction of the first side, and the second fixing part being connected to the first central magnetic part or the second central magnetic part or the second side magnetic part. Each of the first central magnetic portion is spaced apart from the first side magnetic portion, the second side magnetic portion and the second central magnetic portion to form a magnetic gap.

6. The sound-generating device as described in claim 5, characterized in that, The second side magnetic part includes a second side magnet and a second side magnetic plate stacked together, and the second side magnet is connected to the magnetic yoke; Alternatively, the second side magnetic part includes a second side magnet, a second side magnetic plate and a third side magnet stacked together. The second side magnet is connected to the magnetic yoke. The second side magnet and the third side magnet are both magnetized along the vibration direction of the vibration system and the magnetization directions are opposite. The extension part is provided with a second fixing part corresponding to the second side magnetic part. The second fixing part is connected to the third side magnet. The vibration plate is provided with the hollow hole corresponding to the second side magnetic part.

7. The sound-generating device as claimed in claim 1, characterized in that, The vibration system further includes a centering assembly, which includes a first support plate and a second support plate. The first support plate includes an outer fixing part, an inner fixing part, and a spring arm part connecting the outer fixing part and the inner fixing part. The outer fixing part is connected to the outer shell. The inner fixing part includes at least one fixed connection part, which connects two adjacent voice coils spaced apart along the extension direction of the second side. The second support plate connects two adjacent voice coils arranged along the extension direction of the first side.

8. The sound-generating device as claimed in claim 7, characterized in that, The magnetic circuit system further includes a second side magnetic part disposed on the magnetic yoke, the second side magnetic part being located between two adjacent voice coils arranged along the extension direction of the first side; wherein, the number of voice coils along the extension direction of the second side is at least three, the second side magnetic part includes multiple parts, and the multiple second side magnetic parts are spaced apart along the extension direction of the second side, and a second support plate is disposed between two adjacent second side magnetic parts. And / or, the first support piece includes two pieces, which are symmetrically arranged and respectively correspond to the two second sides; And / or, multiple voice coils are connected in series; or, multiple voice coils are connected in parallel.

9. The sound-generating device as claimed in claim 1, characterized in that, The first side magnet includes two parts, both of which extend along the extension direction of the first side, and the two first side magnets are respectively disposed on opposite sides of the voice coil assembly along the extension direction of the second side.

10. An electronic device, characterized in that, The electronic device includes a sound-generating device as described in any one of claims 1 to 9.

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