Sound production device and electronic device

Abstract

The application discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction. The metal shell of the sound production device is annular. Two voice coils of a vibration system are arranged at intervals along a second direction. The ratio of the size of each voice coil along the second direction to the size of each voice coil along a third direction is 4:1-9:1. Two skeletons are respectively connected to the two voice coils and a diaphragm assembly. The top wall of each skeleton is connected to the diaphragm assembly. Two connecting walls of each skeleton are respectively connected to two first short sides of each voice coil. Two magnetic circuit assemblies of a magnetic circuit system are arranged at intervals along the second direction on the bottom plate of a yoke. The side plate of the yoke is welded to one end of the metal shell, which is away from the diaphragm assembly. The voice coil has a top surface facing one side of the diaphragm assembly, a bottom surface facing the other side of the diaphragm assembly, and a side surface connecting the top surface and the bottom surface. The connecting wall is connected to the side surface. The sound production device of the application increases the volume of the magnet, improves the BL value, and thus improves the acoustic performance.

Description

Technical Field

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

[0002] In recent years, with the further development of science and technology, the field of smart electronics has also ushered in a period of rapid development. People have put forward more demands for the development of smart terminal electronic products, gradually forming new trends such as high performance, miniaturization, and thinness in electronic products. As the sound-producing unit of smart electronic products, the high performance, high sound quality, and thinness of speakers have gradually become mainstream consumer demands. Especially with the development of headphones, the requirements for speakers in headphones are getting higher and higher. In order to improve the performance of speakers, product designs are becoming more and more extreme, and space utilization is also becoming more and more efficient.

[0003] In related technologies, it is difficult to achieve a speaker width of 4mm, mainly due to the large space occupied by the shell wall thickness and the adhesive gap. At the same time, the outer diameter of the voice coil in the speaker is limited by the inner diameter of the diaphragm's vibrating part. Usually, the voice coil cannot exceed the inner diameter of the vibrating part; otherwise, the movement of the diaphragm's surround will be restricted, which will limit the size of the magnetic circuit system. The magnetic circuit size cannot be increased, thus affecting the speaker's acoustic performance and preventing enhancement. Summary of the Invention

[0004] The main objective of this invention is to provide a sound-generating device and an electronic device that addresses the problem of limited internal space in existing sound-generating devices, which prevents the increase of magnet volume. This sound-generating device increases magnet volume and improves BL value, thereby enhancing acoustic performance.

[0005] To achieve the above objectives, the present invention provides a sound-generating device, the sound-generating device comprising: Metal casing, the metal casing is ring-shaped; A vibration system vibrates along a first direction, comprising a diaphragm assembly, two voice coils, and two frames. The outer periphery of the diaphragm assembly is connected to one end of a metal housing. The two voice coils are spaced apart along a second direction. Each voice coil has two first long straight sides extending along the second 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. The ratio of the size of the voice coil along the second direction to the size of the voice coil along a third direction is 4:1 to 9:1. Each frame connects one voice coil and the diaphragm assembly. Each frame includes a top wall and two connecting walls extending from both ends of the top wall along the second direction. The two connecting walls are respectively connected to the two first short sides of each voice coil. The first direction, the second direction, and the third direction are arranged perpendicularly to each other. A magnetic circuit system, the magnetic circuit system including a magnetic yoke and two magnetic circuit components spaced apart from the magnetic yoke along a second direction, each voice coil surrounding one of the magnetic circuit components, the magnetic yoke including a base plate and a side plate bent and extended from the periphery of the base plate, the two magnetic circuit components spaced apart from the base plate along the second direction, the side plate being welded to the end of the metal housing away from the diaphragm assembly; The voice coil has a top surface facing the diaphragm assembly, a bottom surface facing away from the diaphragm assembly, and a side surface connecting the top surface and the bottom surface, and the connecting wall is connected to the side surface.

[0006] In one embodiment, the vibration system further includes two centering supports, which are respectively disposed at both ends of the sound-generating device along the second direction. The centering support includes an outer connecting part, a deformation part, and an inner connecting part. The outer connecting part is connected to the metal shell, and the inner connecting part is connected to the first short side and / or the connecting wall.

[0007] In one embodiment, the connecting wall includes a vertical wall extending along the first direction and a supporting wall extending from the vertical wall by bending along the second direction, the vertical wall being connected to the side surface and the supporting wall being connected to the bottom surface; The inner connecting part is connected to the side or the supporting wall.

[0008] In one embodiment, the connecting wall includes a vertical segment extending along the first direction and an edge portion extending from the vertical segment by bending along the second direction, the vertical segment being connected to the side surface and the inner connecting portion being connected to the edge portion.

[0009] In one embodiment, the outer wall of the side plate is flush with the outer wall of the metal casing; And / or, the side plate includes two, and the two side plates are respectively formed by bending and extending the two long sides of the bottom plate along the second direction; And / or, the metal casing includes an annular body extending along the first direction, the thickness of the annular body being 0.2mm to 0.8mm.

[0010] In one embodiment, the magnetic circuit assembly includes a first magnet, a magnetic conductive plate, and a second magnet stacked along the first direction, wherein the second magnet is connected to the base plate; Wherein, along the second direction or the third direction upward, at least a portion of the voice coil is opposite to the magnetic plate; And / or, the ratio of the thickness of the first magnet along the first direction to the thickness of the second magnet along the first direction is 1:3 to 1:1; And / or, both the first magnet and the second magnet are magnetized along the first direction but in opposite directions.

[0011] In one embodiment, the diaphragm assembly includes a diaphragm and a vibrating plate. The diaphragm includes a central portion, a folded ring portion, and a fixing portion connected in sequence. The fixing portion is connected to one end of the metal housing, and the vibrating plate is connected to the central portion. The vibrating plate is located on the side of the central part facing away from the voice coil, and the top wall is connected to the central part; Alternatively, the diaphragm is located on the side of the central portion facing the voice coil, and the top wall is connected to the diaphragm.

[0012] In one embodiment, the distance between the two first long straight edges is greater than the dimension of the vibrating plate along the third direction; And / or, the dimension of the top wall along the third direction is not greater than the dimension of the vibrating plate along the third direction; And / or, the ratio of the dimension of the top wall along the third direction to the dimension of the vibrating plate along the third direction is 1:2 to 1:1; And / or, the top wall is provided with multiple through holes; wherein, the multiple through holes are irregularly distributed; or, the multiple through holes are arranged in an array.

[0013] In one embodiment, the sound-generating device has a length along the second direction and a width along the third direction, wherein the ratio of the length to the width of the sound-generating device is 4:1 to 10:1.

[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 features a ring-shaped metal casing, with the vibration system and magnetic circuit system connected to opposite ends of the casing. This metal casing effectively connects and fixes the vibration and magnetic circuit systems. Furthermore, the thin wall thickness of the metal casing, while maintaining structural strength, allows for a larger internal cavity within the same dimensions. This increases the volume of the magnetic circuit system, thereby enhancing the magnetic field strength, improving the BL value, and ultimately improving acoustic performance. The magnetic yoke of the magnetic circuit system is welded to the end of the metal casing furthest from the diaphragm assembly via a side plate. The connection is improved to enhance stability and reliability. Simultaneously, the vibration system is configured with a diaphragm assembly, two voice coils, and two frames. The two voice coils are spaced apart along a second direction, and each voice coil has two first long straight sides extending along the second 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. The ratio of the voice coil's dimension along the second direction to its dimension along the third direction is 4:1 to 9:1. The two voice coils are connected to the diaphragm assembly using two frames, and the magnetic circuit system is configured with a yoke and... Two magnetic circuit components are positioned on the yoke and spaced apart along a second direction on the yoke's base plate. Each voice coil is arranged around one magnetic circuit component. Under the magnetic field of the magnetic circuit system, the two voice coils vibrate simultaneously along a first direction, causing the diaphragm assembly to vibrate and produce sound through the two skeletons. Furthermore, each skeleton is configured with a top wall and two connecting walls extending from the top wall along the second direction. The two top walls of each skeleton are connected to the diaphragm assembly along the second direction, and the two connecting walls of each skeleton are connected to the two first short sides of each voice coil. This not only allows the two voice coils to connect to the diaphragm assembly through the two skeletons, effectively increasing the connection area and improving connection stability and reliability, but also avoids the connecting walls of the skeletons occupying the size of the first long straight side of the voice coil. This prevents the magnetic circuit system from reducing its volume to avoid the connecting walls, ensuring an increased size between the two first long straight sides of the voice coil. Simultaneously, it increases the size of the magnetic circuit assembly along a third direction, thereby increasing the magnet volume, improving the BL value, and ultimately enhancing acoustic performance. 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 1A top view schematic diagram of an embodiment of the sound-generating device provided by the present invention; Figure 2 A bottom view of an embodiment of the sound-generating device provided by the present invention; Figure 3 A cross-sectional view along the second direction in one embodiment of the sound-generating device provided by the present invention; Figure 4 A cross-sectional view along a third direction in one embodiment of the sound-generating device provided by the present invention; Figure 5 An exploded view of an embodiment of the sound-generating device provided by the present invention; Figure 6 This is a partial bottom view schematic diagram of an embodiment of the vibration system provided by the present invention; Figure 7 A partial cross-sectional schematic diagram along the second direction in one embodiment of the vibration system provided by the present invention; Figure 8 for Figure 7 Enlarged view of point A in the middle; Figure 9 This is a partially enlarged cross-sectional schematic diagram of an embodiment of the vibration system provided by the present invention; Figure 10 A schematic diagram of a skeleton provided by the present invention; Figure 11 A schematic diagram of another embodiment of the skeleton provided by the present invention.

[0018] Explanation of icon numbers: 100. Sound-generating device; 1. Metal casing; 2. Vibration system; 21. Diaphragm assembly; 211. Diaphragm; 2111. Center part; 2112. Hoop part; 2113. Fixing part; 212. Vibrating plate; 22. Voice coil; 221. First long straight side; 222. First short side; 223. Top surface; 224. Bottom surface; 225. Side surface; 23. Frame; 231. Top wall; 2311. Through hole; 232. Connecting wall; 2321. First section ; 2322, Second section; 2323, Third section; 2324, Vertical wall; 2325, Support wall; 2326, Vertical section; 2327, Edge section; 24, Centering support plate; 241, External connecting part; 242, Deformation part; 243, Internal connecting part; 3, Magnetic circuit system; 31, Magnetic yoke; 311, Base plate; 312, Side plate; 32, Magnetic circuit assembly; 321, First magnet; 322, Magnetic guide plate; 323, Second magnet; 33, 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 them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled 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 proposes a sound-generating device 100. It is understood that the sound-generating device 100 is applied to electronic devices, such as mobile phones, headphones, smart wearable devices, etc., and is not limited thereto.

[0025] Please refer to the reference. Figures 1 to 10As shown, in this embodiment of the invention, the sound-generating device 100 includes a metal housing 1, a vibration system 2, and a magnetic circuit system 3. The metal housing 1 is annular. The vibration system 2 vibrates along a first direction. The vibration system 2 includes a diaphragm assembly 21, two voice coils 22, and two frames 23. The outer periphery of the diaphragm assembly 21 is connected to one end of the metal housing 1. The two voice coils 22 are arranged at intervals along a second direction. Each voice coil 22 has two first long straight sides 221 extending along the second direction and two first short sides 222 connecting the two first long straight sides 221. The two first long straight sides 221 and the two first short sides 222 are connected end to end. The ratio of the size of the voice coil 22 along the second direction to the size of the voice coil 22 along the third direction is 4:1 to 9:1. Each frame 23 connects a voice coil 22 and a diaphragm assembly 21. Each frame 23 includes a top wall 231 and a magnetic circuit system 3 extending from the top wall 231 along the second direction. Two connecting walls 232 bend and extend at both ends of the direction, and the two connecting walls 232 are respectively connected to the two first short sides 222 of each voice coil 22. The first direction, the second direction and the third direction are arranged perpendicularly to each other. The magnetic circuit system 3 includes a magnetic yoke 31 and two magnetic circuit components 32 spaced apart from the magnetic yoke 31 along the second direction. Each voice coil 22 is arranged around a magnetic circuit component 32. The magnetic yoke 31 includes a base plate 311 and a side plate 312 bends and extends from the periphery of the base plate 311. The two magnetic circuit components 32 are spaced apart from the base plate 311 along the second direction. The side plate 312 is welded to the end of the metal shell 1 away from the diaphragm component 21. The voice coil 22 has a top surface 223 facing the diaphragm component 21, a bottom surface 224 facing away from the diaphragm component 21 and a side surface 225 connecting the top surface 223 and the bottom surface 224. The connecting wall 232 is connected to the side surface 225.

[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. The magnetic circuit system 3 has a magnetic gap 33. One end of each voice coil 22 of the vibration system 2 is connected to the diaphragm assembly 21 through a frame 23, and the other end of each voice coil 22 is suspended within the magnetic gap 33 of the magnetic circuit system 3, so that each voice coil 22 is arranged around a magnetic circuit assembly 32. When current is passed through the two voice coils 22, the two voice coils 22 vibrate within the magnetic field formed by the magnetic circuit system 3, that is, they reciprocate within the magnetic gap 33. This causes the magnetic circuit system 3 to drive the two voice coils 22 to vibrate the two frames 23 and the diaphragm assembly 21 respectively, thereby achieving sound production.

[0028] To better assemble the magnetic circuit system 3 and vibration system 2 of the sound-generating device 100, in one embodiment, as... Figures 2 to 5As shown, the sound-generating device 100 also includes a metal housing 1. One end of the metal housing 1 is connected to the magnetic circuit system 3, and the other end of the metal housing 1 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 metal 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] In this embodiment, as Figures 2 to 5 As shown, by using a metal shell 1, that is, the metal shell 1 is made of metal material, such as metal sheet or steel sheet processed into a ring structure, the wall thickness of the metal shell 1 can be made thinner while maintaining the corresponding structural strength. Under the same size, the cavity structure inside the metal shell 1 can be effectively increased, thereby 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.

[0030] It should be noted that the metal 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 metal shell 1 provides the mounting base for components such as the magnetic circuit system 3 and the vibration system 2. It is understood that the metal shell 1 can be a single integral structure or formed by multiple separate structures, and this is not limited here. In this embodiment, the metal shell 1 can be a rectangular or racetrack-shaped frame or structure, that is, the metal 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 metal shell 1 and are arranged opposite to each other, so that the magnetic circuit system 3, the metal shell 1, and the diaphragm 211 of the vibration system 2 enclose and form a vibration cavity. Of course, the metal shell 1 can also be other shapes or irregular structures, and this is not limited here.

[0031] Understandably, the sound-generating device 100 is used in electronic devices, meaning it can be mounted on the electronic device via a metal casing 1. It should be noted that the metal casing 1 of the sound-generating device 100 can be a separate casing or enclosure structure from the electronic device. In this case, the metal casing 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 metal casing 1 of the sound-generating device 100 can be integrally molded with the casing or enclosure structure of the electronic device, effectively improving structural strength and sealing performance.

[0032] In this embodiment, the metal casing 1 is used to fix the vibration system 2 and the magnetic circuit system 3, etc., so that the sound generating device 100 can be used as an independent component in an electronic device or a sound generating module, which is not limited here. Of course, in other embodiments, the sound generating device 100 can also be a module structure. In this case, the vibration system 2 and the magnetic circuit system 3 of the sound generating unit are installed as multiple independent components on the metal casing 1 of the module structure, which is not limited here.

[0033] Optionally, the sound-generating device 100 is rectangular or racetrack-shaped. In this embodiment, the metal housing 1 of the sound-generating device 100 may optionally be a rectangular or racetrack-shaped annular structure. To facilitate the connection and assembly of the vibration system 2 and the magnetic circuit system 3 with the metal housing 1, the outer contours of the vibration system 2 and the magnetic circuit system 3 may optionally be rectangular or racetrack-shaped.

[0034] It should be noted that, as Figures 1 to 10 As shown, in a specific example, the vibration direction of the vibration system 2 of the sound-generating device 100 is the first direction (i.e., the thickness direction of the sound-generating device 100), the long side direction of the sound-generating device 100 (i.e., the length direction of the sound-generating device 100) is the second direction, and the short side direction of the sound-generating device 100 (i.e., the width direction of the sound-generating device 100) is the third direction. Optionally, the first direction, the second direction, and the third direction are perpendicular to each other.

[0035] In this embodiment, the first direction is the thickness direction or Z-direction of the sound-generating device 100, the vibration system 2 vibrates along the first direction (e.g., the vertical direction), the second direction is the length direction or X-direction of the sound-generating device 100, and the third direction is the width direction or Y-direction of the sound-generating device 100.

[0036] Understandably, the sound-generating device 100 has a length along the second direction and a width along the third direction. Optionally, the length-to-width ratio of the sound-generating device 100 is 4:1 to 10:1.

[0037] In this embodiment, as Figure 1 , Figure 2 and Figure 5 As shown, the sound-generating device 100 has an elongated strip-shaped structure extending along the second direction. The length-to-width ratio of the sound-generating device 100 is 4:1 to 10:1, that is, the ratio of the length to the width of the sound-generating device 100 is 4:1 to 10:1. Optionally, the length-to-width ratio of the sound-generating device 100 can be 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, etc., and is not limited here.

[0038] Understandable, such as Figures 1 to 5As shown, by connecting the outer periphery of the diaphragm assembly 21 of the vibration system 2 to the metal shell 1, the vibration system 2 is fixed to the metal shell 1. At this time, the outer contour of the metal shell 1 and the outer contour of the diaphragm assembly 21 are the outer contour of the sound-generating device 100, that is, the length-to-width ratio of the diaphragm assembly 21 is 4:1 to 10:1. In order to avoid the first long straight side 221 of the voice coil 22 being too long and affecting the sound production effect of the diaphragm assembly 21, the vibration system 2 is provided with two voice coils 22 and two frames 23. The two voice coils 22 are spaced apart along the second direction, so that the two frames 23 respectively connect the two voice coils 22 to the diaphragm assembly 21. In this way, the two voice coils 22 are connected to the diaphragm assembly 21 through the two frames 23. At the same time, by using the two voice coils 22 and the two frames 23 spaced apart along the second direction, not only is the diaphragm assembly 21 supported in the length direction, but the sound production effect of the diaphragm assembly 21 can also be effectively improved.

[0039] In this embodiment, as Figure 4 and Figure 5 As shown, the magnetic yoke 31 includes a base plate 311 and a side plate 312 that extends from the periphery of the base plate 311. Two magnetic circuit components 32 are spaced apart on the base plate 311 along the second direction and are spaced apart from the side plate 312 to form a magnetic gap 33. Each voice coil 22 is located in a magnetic gap 33 and each voice coil 22 is arranged around a magnetic circuit component 32.

[0040] Understandably, by setting the magnetic yoke 31 as a base plate 311 and a side plate 312, the two magnetic circuit components 32 are spaced apart on the base plate 311 along the second direction and spaced apart from the side plate 312, so that the side plate 312 and the two magnetic circuit components 32 form two magnetic gaps 33 spaced apart along the second direction. At this time, the two voice coils 22 correspond to the two magnetic gaps 33 respectively, and each voice coil 22 is located in a magnetic gap 33. Thus, the two magnetic circuit components 32 of the magnetic circuit system 3 form a magnetic field, and form a magnetic circuit with the base plate 311 and the side plate 312 of the magnetic yoke 31 respectively, passing through each voice coil 22 in each magnetic gap 33, thereby ensuring the driving force of the magnetic circuit system 3 on the two voice coils 22.

[0041] Optionally, the base plate 311 and side plate 312 of the magnetic yoke 31 can be integrally formed. In this embodiment, the base plate 311 and side plate 312 are formed by integral stretching, which is not limited here. One end of the metal shell 1 is connected to the side plate 312, and the other end of the metal shell 1 is connected to the outer periphery of the diaphragm assembly 21. Optionally, the metal shell 1 is welded to the side plate 312 of the magnetic yoke 31. This can improve the connection stability and reliability between the metal shell 1 and the magnetic yoke 31 of the magnetic circuit system 3, which is not limited here.

[0042] Of course, in other embodiments, the metal shell 1 and the side plate 312 of the magnetic yoke 31 can also be bonded together, which is not limited here.

[0043] Optionally, the outer wall of the side plate 312 is flush with the outer wall of the metal casing 1. Understandably, this ensures both the aesthetic appearance of the sound-generating device 100 and the structural strength of the metal casing 1 within the same dimensions, while maximizing the volume inside the metal casing 1, thereby increasing the volume of the magnetic circuit system 3.

[0044] In this embodiment, the metal casing 1 includes an annular body extending along a first direction. Optionally, the thickness of the annular body is 0.2mm to 0.8mm. This ensures the structural strength of the metal casing 1 while allowing the annular body to be relatively thin, maximizing the volume within the metal casing 1 and thus increasing the volume of the magnetic circuit system 3. Optionally, the thickness of the annular body can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc., and is not limited here.

[0045] Optionally, the side plate 312 includes two side plates, which are formed by bending and extending the two long sides of the base plate 311 along the second direction.

[0046] In this embodiment, as Figure 4 and Figure 5 As shown, the metal casing 1 is connected to the two side plates 312 of the magnetic yoke 31 at the ends away from the base plate 311. Optionally, the outer wall of the metal casing 1 is flush with the outer wall of the side plate 312. This ensures both the aesthetic appearance of the sound-generating device 100 and the structural strength of the metal casing 1 within the same dimensions, while maximizing the volume inside the metal casing 1, thereby increasing the volume of the magnetic circuit system 3.

[0047] Understandably, by bending and extending the two long sides of the base plate 311 along the second direction to form two side plates 312, the two side plates 312 are positioned opposite each other and spaced apart along the third direction. This allows the two side plates 312 to form magnetic gaps 33 with the two magnetic circuit components 32. Since the aspect ratio of the voice coil 22 is greater than 2, that is, the size of the two first long straight sides 221 of the voice coil 22 is much larger than the size of the two first short sides 222 of the voice coil 22, the two first long straight sides 221 are positioned as close as possible within the magnetic gaps 33 formed by the magnetic circuit components 32 and the two side plates 312. This allows the two first long straight sides 221 to be subjected to a stronger magnetic field, thereby increasing the driving force on the voice coil 22. Since the size of the two first short sides 222 is small, the driving force from the magnetic field is limited.

[0048] Understandable, such as Figure 1 , Figure 5As shown, the diaphragm assembly 21 of the vibration system 2 can optionally be rectangular or racetrack-shaped. In this embodiment, the diaphragm assembly 21 includes a middle portion, a folded ring portion 2112, and a fixing portion 2113 connected in sequence, that is, the folded ring portion 2112 is arranged around the middle portion, and the fixing portion 2113 is arranged around the folded ring portion 2112. The fixing portion 2113 of the diaphragm assembly 21 is connected to one end of the metal shell 1, and the magnetic yoke 31 of the magnetic circuit system 3 is connected to the other end of the metal shell 1.

[0049] It should be noted that the middle portion of the diaphragm assembly 21 can be either planar or flat, and the plane containing the middle portion is perpendicular to the first direction. The folded ring portion 2112 of the diaphragm assembly 21 is the folded ring of the diaphragm assembly 21, and the folded ring portion 2112 can be a convex structure that protrudes upward along the first direction or a concave structure that is recessed downward; no limitation is made here. The inner edge of the folded ring portion 2112 is connected to the outer edge of the middle portion, and the outer edge of the folded ring portion 2112 is connected to the inner edge of the fixing portion 2113. The fixing portion 2113 of the diaphragm assembly 21 is used to connect to the metal housing 1. The fixing part 2113 may extend along a plane perpendicular to the first direction to form a planar or flat plate connecting part, in which case the fixing part 2113 is connected to the end face of one end of the metal shell 1; or, the fixing part 2113 may extend along the first direction to form a vertical planar or vertical plate connecting part parallel to the first direction, in which case the fixing part 2113 is connected to the inner side wall of the metal shell 1; or, the fixing part 2113 may include a planar or flat plate connecting part extending along a plane perpendicular to the first direction and a vertical planar or vertical plate connecting part extending along the first direction, in which case the fixing part 2113 is connected to the end face and the outer side wall of one end of the metal shell 1, which is not limited here.

[0050] Optionally, the middle portion, the folded ring portion 2112, and the fixing portion 2113 of the diaphragm assembly 21 are integrally formed. In this embodiment, the connection between the folded ring portion 2112 and the middle portion and the fixing portion 2113 is a smooth transition connection.

[0051] Optionally, the middle portion, the folded ring portion 2112, and the fixing portion 2113 are all rectangular or racetrack-shaped. In this embodiment, the folded ring portion 2112 has two second long straight sides extending along the second direction and two second short sides connecting the two second long straight sides. The two second long straight sides and the two second short sides are connected end to end and surround the middle portion.

[0052] It should be noted that the connection between the second long straight side and the second short side of the folded ring portion 2112 can be a right angle perpendicular to each other. In this case, the two second long straight sides and the two second short sides of the folded ring portion 2112 form a right-angled rectangle structure, that is, the second long straight side extends along the second direction, and the second short side extends along the third direction. Of course, for the sake of structural aesthetics, structural strength, and process requirements, the connection between the second long straight side and the second short side of the folded ring portion 2112 can also be a rounded corner structure with a smooth transition. In this case, the two second long straight sides and the two second short sides of the folded ring portion 2112 form a rounded rectangle or a racetrack-shaped structure, that is, the second short side has a first straight segment extending along the third direction and two first arc segments connecting the two ends of the first straight segment, and the second long straight side extends along the second direction and connects to the end of the first arc segment away from the first straight segment. Alternatively, the second short side can be entirely arc-shaped, which is not limited here.

[0053] In this embodiment, as Figures 5 to 9 As shown, the voice coil 22 has two first long straight sides 221 extending along a second direction and two first short sides 222 connecting the two first long straight sides 221. The two first long straight sides 221 and the two first short sides 222 are connected end to end, making the voice coil 22 a square or rectangular ring structure. In this embodiment, the ratio of the dimension of the voice coil 22 along the second direction to the dimension of the voice coil 22 along the third direction can optionally be greater than 2, that is, the aspect ratio of the voice coil 22 is greater than 2, thus making the voice coil 22 a long strip structure.

[0054] It should be noted that the connection between the first long straight side 221 and the first short side 222 of the voice coil 22 can be a right angle perpendicular to each other. In this case, the two first long straight sides 221 and the two first short sides 222 of the voice coil 22 are connected end to end to form a right-angled rectangular structure. That is, the first long straight side 221 extends along the second direction and the first short side 222 extends along the third direction. The length-to-width ratio of the voice coil 22 is the ratio of the dimension of the first long straight side 221 along the second direction to the dimension of the first short side 222 along the third direction. Of course, for aesthetic reasons, structural strength requirements, and manufacturing specifications, the connection between the first long straight side 221 and the first short side 222 of the voice coil 22 can also be a rounded corner structure with a smooth transition. In this case, the two first long straight sides 221 and the two first short sides 222 of the voice coil 22 connect end to end to form a rounded rectangle or racetrack-shaped structure. That is, the first short side 222 has a second straight segment extending along a third direction and two second arc-shaped segments connecting the two ends of the second straight segment. The first long straight side 221 extends along a second direction and connects to the end of the second arc-shaped segment away from the second straight segment. The aspect ratio of the voice coil 22 is the ratio of the distance between the two second straight segments along the second direction to the distance between the two first long straight sides 221 along the third direction. Alternatively, the first short side 222 can be entirely arc-shaped, and the aspect ratio of the voice coil 22 can be the ratio of the maximum distance between the two first short sides 222 along the second direction to the distance between the two first long straight sides 221 along the third direction. This is not limited here.

[0055] Optionally, the ratio of the dimension of the voice coil 22 along the second direction to the dimension of the voice coil 22 along the third direction is 4:1 to 9:1. In this embodiment, the aspect ratio of the voice coil 22 is 4:1 to 9:1, thus making the voice coil 22 have an elongated shape. Optionally, the aspect ratio of the voice coil 22 is 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, etc., and is not limited here.

[0056] In this embodiment, as Figures 3 to 11 As shown, by setting the frame 23 as a top wall 231 and connecting walls 232 that bend and extend from both ends of the top wall 231 along the second direction, the top wall 231 of the frame 23 is connected to the middle part of the diaphragm assembly 21, and the two connecting walls 232 of the frame 23 are correspondingly connected to the two first short sides 222 of the voice coil 22, and the connecting walls 232 are connected to the side surface 225 of the first short side 222 of the voice coil 22. In this way, the voice coil 22 is connected to the diaphragm assembly 21 through the frame 23, and the connection area is increased, thereby improving the connection stability and reliability.

[0057] Understandably, by connecting the connecting wall 232 of the frame 23 to the first short side 222 of the voice coil 22, the voice coil 22 can be connected and fixed to the diaphragm assembly 21 through the frame 23, while avoiding the connecting wall 232 of the frame 23 from occupying the size of the first long straight side 221 of the voice coil 22. This avoids the magnetic circuit system 3 from reducing its volume to avoid the connecting wall 232, thereby ensuring that the size between the two first long straight sides 221 of the voice coil 22 is expanded, maximizing the setting size of the magnetic circuit assembly 32, increasing the magnet volume, improving the BL value, and thus improving the acoustic performance of the sound-generating device 100.

[0058] Optionally, the outer periphery of the top wall 231 of the frame 23 does not extend beyond the edge of the middle portion of the diaphragm assembly 21. It is understood that by setting the top wall 231 of the frame 23 to not extend beyond the edge of the middle portion, interference between the frame 23 and the folded portion 2112 of the diaphragm assembly 21 is avoided.

[0059] In one embodiment, the diaphragm assembly 21 includes a diaphragm 211 and a vibrating plate 212. The diaphragm 211 includes a central portion 2111, a folded ring portion 2112 and a fixing portion 2113 connected in sequence. The fixing portion 2113 is connected to one end of the metal housing 1, and the vibrating plate 212 is connected to the central portion 2111.

[0060] In this embodiment, as Figure 1 , Figures 3 to 9 As shown, the vibrating plate 212 is connected to the center portion 2111 of the diaphragm 211, so that the vibrating plate 212 and the center portion 2111 of the diaphragm 211 form the middle portion of the diaphragm assembly 21. Optionally, the center portion 2111 of the diaphragm 211, the folded ring portion 2112, and the fixing portion 2113 can be selected as an integrally formed structure.

[0061] Understandably, the central portion 2111 of the diaphragm 211 can be a flat or planar structure; alternatively, the central portion 2111 of the diaphragm 211 can also be an annular structure, i.e., the central portion 2111 has a perforated hole, which can reduce the weight of the diaphragm assembly 21. By providing a vibrating plate 212, which is connected to the central portion 2111, the vibrating plate 212 and the central portion 2111 form an intermediate part, thus the vibrating plate 212 can be used to strengthen the structural strength of the central portion 2111 of the diaphragm 211.

[0062] Optionally, the diaphragm 212 is located on the side of the center portion 2111 facing away from the voice coil 22. In this embodiment, the top wall 231 of the frame 23 is connected to the center portion 2111.

[0063] Optionally, the diaphragm 212 is located on the side of the center portion 2111 facing the voice coil 22. In this embodiment, the top wall 231 of the frame 23 is connected to the diaphragm 212.

[0064] In this embodiment, as Figures 4 to 6 As shown, the dimension of the top wall 231 along the third direction is not greater than the dimension of the vibrating plate 212 along the third direction. It can be understood that the dimension of the vibrating plate 212 is the same as the dimension of the center portion 2111 of the diaphragm 211. By setting the dimension of the top wall 231 along the third direction to be no greater than the dimension of the vibrating plate 212 along the third direction, interference between the frame 23 and the folded portion 2112 of the diaphragm assembly 21 is avoided.

[0065] Optionally, the ratio of the dimension of the top wall 231 along the third direction to the dimension of the vibrating plate 212 along the third direction is 1:2 to 1:1. In this embodiment, the ratio of the dimension of the top wall 231 along the third direction to the dimension of the vibrating plate 212 along the third direction is 1:2, 1:1.5, 1:1, etc., and is not limited here.

[0066] In one embodiment, the distance between the two first long straight edges 221 is greater than the dimension of the vibrating plate 212 along a third direction.

[0067] In this embodiment, as Figures 4 to 6 As shown, by setting the distance between the two first long straight edges 221 of the voice coil 22 to be greater than the dimension of the diaphragm 212 along a third direction, that is, the projection of the two first long straight edges 221 of the voice coil 22 along the first direction is located outside the inner edge of the second long straight edge. This ensures that the first long straight edges 221 of the voice coil 22 will not interfere with the loop portion 2112 of the diaphragm assembly 21, while simultaneously increasing the width between the two first long straight edges 221 of the voice coil 22 along a third direction. This allows the magnetic circuit assembly 32 to be enlarged along a third direction when the voice coil 22 surrounds the magnetic circuit assembly 32, thereby increasing the magnet volume, improving the BL value, and thus enhancing the acoustic performance of the sound-generating device 100.

[0068] In one embodiment, the projection of the connecting wall 232 along the first direction is located outside the magnetic circuit assembly 32, and the projections of the connecting wall 232 and the first short side 222 along the first direction are both located inside the second short side.

[0069] In this embodiment, as Figures 3 to 5As shown, by placing the projections of the connecting wall 232 and the first short side 222 of the voice coil 22 along the first direction inside the second short side of the surround portion 2112 of the diaphragm assembly 21, the voice coil 22 can be connected to the diaphragm assembly 21 via the frame 23, while ensuring that the connecting wall 232 of the frame 23 and the first short side 222 of the voice coil 22 do not interfere with the surround portion 2112 of the diaphragm assembly 21. Furthermore, by placing the projection of the first long straight side 221 of the voice coil 22 along the first direction outside the inner edge of the second long straight side of the surround portion 2112, the sound... The first long straight edge 221 of the voice coil 22 will not interfere with the folded ring portion 2112 of the diaphragm assembly 21. At the same time, the width between the two first long straight edges 221 of the voice coil 22 along the third direction is increased, and the projection of the connecting wall 232 along the first direction is located outside the magnetic circuit assembly 32. Thus, when the voice coil 22 is arranged around the magnetic circuit assembly 32, the connecting wall 232 of the frame 23 will not interfere with the magnetic circuit assembly 32. At the same time, the size of the magnetic circuit assembly 32 along the third direction can be increased, thereby increasing the magnet volume, improving the BL value, and thus improving the acoustic performance of the sound generating device 100.

[0070] In this embodiment, given the limited space, the two voice coils 22 of the sound-generating device 100 are connected to the diaphragm assembly 21 via two frames 23, respectively. This ensures that the projections of the first short side 222 of each voice coil 22 and the connecting wall 232 of each frame 23 along the first direction are both located inside the second short side of the surround portion 2112 of the diaphragm assembly 21, and the projection of the first long straight side 221 of each voice coil 22 along the first direction is located outside the inner edge of the second long straight side of the surround portion 2112. This expands the two first long straight sides of each voice coil 22. The width between the straight edges 221 means that the outer diameter of each voice coil 22 along the third direction can be made larger and exceed the inner diameter of the middle part along the third direction, thereby increasing the size of the voice coil 22 and increasing the L value of the voice coil 22. At the same time, the size of the magnetic circuit assembly 32 located in the voice coil 22 along the third direction can be increased, which means that a larger magnetic circuit can be set on the inner side of the voice coil 22, thereby increasing the magnet volume of the magnetic circuit system 3. This allows the voice coil 22 to effectively increase the BL value when it vibrates in the magnetic field formed by the magnetic circuit system 3, thereby improving the acoustic performance of the sound generating device 100.

[0071] In one embodiment, the folded ring portion 2112 has a centerline position, and the portion of the second long straight edge located outside the centerline position at least partially overlaps with the projection of the first long straight edge 221 along the first direction.

[0072] In this embodiment, as Figure 4 As shown, the centerline of the folded ring portion 2112 is located at the midpoint of the line connecting the inner edge and the outer edge of the folded ring portion 2112. The second long straight edge of the folded ring portion 2112 has a first portion located outside the centerline position and a second portion located inside the centerline position.

[0073] Understandably, by at least partially overlapping the projection of the first long straight edge 221 of the voice coil 22 along the first direction with the projection of the portion of the second long straight edge of the loop 2112 located outside the centerline along the first direction, that is, by at least partially overlapping the projection of the first long straight edge 221 of the voice coil 22 along the first direction with the projection of the first portion of the second long straight edge located outside the centerline along the first direction, the width between the two first long straight edges 221 of the voice coil 22 is expanded. This means that the outer diameter of the voice coil 22 along the third direction can be made larger and exceed the inner diameter of the middle portion along the third direction, thereby increasing the size of the voice coil 22 and improving the L value of the voice coil 22. At the same time, the size of the magnetic circuit assembly 32 located in the voice coil 22 along the third direction can be increased, which means that a larger magnetic circuit can be provided on the inner side of the voice coil 22, thereby increasing the magnet volume of the magnetic circuit system 3. This allows the voice coil 22 to effectively increase the BL value when vibrating in the magnetic field formed by the magnetic circuit system 3, thereby improving the acoustic performance of the sound-generating device 100.

[0074] Optionally, the projection of the first long straight side 221 along the first direction is located outside the centerline position. In this embodiment, as... Figure 4 As shown, the projection of the first long straight edge 221 of the voice coil 22 along the first direction is located on the outer side of the center line along the first direction, that is, the side of the center line facing the fixing part 2113.

[0075] Optionally, the projection of the first long straight side 221 along the first direction is located inside the outer edge of the second long straight side. In this embodiment, as... Figure 4 As shown, the projection of the first long straight edge 221 along the first direction is located inside the outer edge of the second long straight edge of the folded ring portion 2112, that is, the projection of the first long straight edge 221 along the first direction does not coincide with the projection of the fixing portion 2113 along the first direction.

[0076] In this embodiment, as Figure 4 As shown, the projection of the first long straight edge 221 of the voice coil 22 along the first direction is located outside the centerline, and the projection of the first long straight edge 221 along the first direction is located inside the outer edge of the second long straight edge. That is, the projection of the first long straight edge 221 of the voice coil 22 along the first direction is located in the first part of the second long straight edge.

[0077] It should be noted that the number of skeletons 23 is the same as the number of voice coils 22, and the number of voice coils 22 is the same as the number of magnetic circuit components 32 in the magnetic circuit system 3. Of course, in other embodiments, the number of skeletons 23 may not be the same as the number of voice coils 22, and the number of magnetic circuit components 32 in the magnetic circuit system 3 may not be the same as the number of voice coils 22; this is not limited here.

[0078] In one embodiment, the top wall 231 of each frame 23 extends along a second direction and is located between two first short sides 222, and the two connecting walls 232 are respectively connected to the two ends of the top wall 231 along the second direction.

[0079] In this embodiment, the top wall 231 of the frame 23 extends along the second direction and connects to the middle portion of the diaphragm assembly 21. Two connecting walls 232 of the frame 23 are respectively connected to the two ends of the top wall 231 along the second direction, such that each connecting wall 232 is correspondingly connected to a first short side 222 of the voice coil 22. This arrangement allows for the connection of the two connecting walls 232 to the two first short sides 222 of the voice coil 22, and also increases the connection area between the top wall 231 and the middle portion, improving connection stability. Optionally, the top wall 231 is located between the two first short sides 222.

[0080] It is understandable that the dimension of the top wall 231 of the skeleton 23 extending along the second direction may be less than the distance between the two first short sides 222; or, the dimension of the top wall 231 of the skeleton 23 extending along the second direction may be greater than the distance between the two first short sides 222; or, the dimension of the top wall 231 of the skeleton 23 extending along the second direction may be equal to the distance between the two first short sides 222, and no limitation is made here.

[0081] In one embodiment, the top wall 231 is provided with a plurality of through holes 2311. In this embodiment, as shown... Figure 11 As shown, by providing multiple through holes 2311 in the top wall 231, the weight of the top wall 231 can be reduced, the sensitivity can be improved, the distortion can be reduced, and the connection area between the top wall 231 and the middle part can be ensured to improve the connection stability.

[0082] Optionally, the multiple through holes 2311 are spaced apart. It is understood that the multiple through holes 2311 are irregularly distributed; or, the multiple through holes 2311 are arranged in an array. In this embodiment, as... Figure 11 As shown, multiple through holes 2311 are arranged in an array along the second direction.

[0083] In one embodiment, the connecting wall 232 includes a first segment 2321 extending along a first direction, a second segment 2322 extending along a second direction from one end of the first segment 2321 away from the diaphragm assembly 21, and a third segment 2323 extending along the first direction from one end of the second segment 2322 away from the first segment 2321. The second segment 2322 is connected to the top surface 223, and the third segment 2323 is connected to the side surface 225.

[0084] In this embodiment, as Figure 10As shown, by configuring the connecting wall 232 as a first segment 2321, a second segment 2322, and a third segment 2323 connected in sequence, the first segment 2321 extends along a first direction, the second segment 2322 is formed by bending and extending the first segment 2321 away from the diaphragm assembly 21 along a second direction, and the third segment 2323 is formed by bending and extending the second segment 2322 away from the first segment 2321 along the first direction. In this way, the first segment 2321 supports the voice coil 22 away from the diaphragm assembly 21, avoiding interference between the voice coil 22 and the folded ring portion 2112 of the diaphragm assembly 21. By connecting the second segment 2322 and the third segment 2323 to the first short side 222 of the voice coil 22, that is, the second segment 2322 is connected to the top surface 223 of the first short side 222, and the third segment 2323 is connected to the side surface 225 of the first short side 222, the connection area is effectively increased, thereby improving the connection firmness and stability.

[0085] Understandably, the side surface 225 of the voice coil 22 includes an inner side facing the magnetic circuit assembly 32 and an outer side facing away from the magnetic circuit assembly 32. In this embodiment, the second segment 2322 may be formed by bending and extending the end of the first segment 2321 away from the diaphragm assembly 21 in a second direction toward the inside or outside. The inner side of the first segment 2321 is the side facing the inner side of the voice coil 22, and the outer side of the first segment 2321 is the side facing the outer side of the voice coil 22.

[0086] It should be noted that when the second segment 2322 is the end of the first segment 2321 that is away from the diaphragm assembly 21 and bends inward along the second direction, the third segment 2323 is connected to the inner surface of the first short side 222 of the voice coil 22. For example... Figure 10 As shown, when the second segment 2322 is the end of the first segment 2321 that is away from the diaphragm assembly 21 and bends outward in the second direction, the third segment 2323 is connected to the outer side of the first short side 222 of the voice coil 22, which is not limited here.

[0087] Optionally, the connecting wall 232 is connected to the first short side 222 of the voice coil 22 by adhesive. In this embodiment, the second segment 2322 of the connecting wall 232 is bonded to the top surface 223 of the first short side 222, and the third segment 2323 of the connecting wall 232 is bonded to the side surface 225 of the first short side 222 of the voice coil 22, which is not limited here.

[0088] Optionally, the first segment 2321, the second segment 2322, and the third segment 2323 of the connecting wall 232 are integrally formed structures. It is understood that the first segment 2321, the second segment 2322, and the third segment 2323 of the connecting wall 232 can be integrally stretched or integrally injection molded, and no limitation is made here.

[0089] In another embodiment, the connecting wall 232 includes a vertical wall 2324 extending along a first direction and a support wall 2325 extending from the vertical wall 2324 by bending along a second direction. The vertical wall 2324 is connected to the side surface 225, and the support wall 2325 is connected to the bottom surface 224.

[0090] In this embodiment, as Figure 9 , Figure 11 As shown, by setting the connecting wall 232 as a vertical wall 2324 and a supporting wall 2325, the vertical wall 2324 is connected to the side 225 of the first short side 222, and the supporting wall 2325 is connected to the bottom surface 224 of the first short side 222. This can effectively increase the connection area between the connecting wall 232 and the first short side 222 of the voice coil 22, and improve the connection stability and firmness.

[0091] Understandable, such as Figure 9 As shown, the vertical wall 2324 of the connecting wall 232 may be connected to the inner side of the first short side 222; or, the vertical wall 2324 of the connecting wall 232 may be connected to the outer side of the first short side 222, which is not limited here.

[0092] Optionally, the vertical wall 2324 and the supporting wall 2325 of the connecting wall 232 are integrally formed structures. It is understood that the vertical wall 2324 and the supporting wall 2325 of the connecting wall 232 can be integrally stretched or integrally injection molded, and there is no limitation here.

[0093] In another embodiment, the connecting wall 232 includes a vertical segment 2326 extending in a first direction and an edge portion 2327 extending from the vertical segment 2326 in a second direction, the vertical segment 2326 being connected to the side surface 225.

[0094] In this embodiment, as Figure 3 , Figure 5 , Figure 7 , Figure 8 As shown, by setting the connecting wall 232 as a vertical section 2326 and an edge portion 2327, the vertical section 2326 is connected to the side surface 225 of the first short side 222, that is, the vertical section 2326 is connected to the outer side surface of the first short side 222, so that the edge portion 2327 bends and extends from the vertical section 2326 in the second direction away from the first short side 222. In this way, the edge portion 2327 is connected and fixed to the centering support or elastic support, thereby increasing the connection area and improving the connection stability.

[0095] Optionally, the vertical section 2326 and the edge portion 2327 of the connecting wall 232 are integrally formed. It is understood that the vertical section 2326 and the edge portion 2327 of the connecting wall 232 can be integrally stretched or integrally injection molded, and there is no limitation here.

[0096] In one embodiment, the vibration system 2 further includes two centering supports 24, which are respectively disposed at both ends of the sound-generating device 100 along the second direction. The centering supports 24 include an outer connecting part 241, a deformation part 242, and an inner connecting part 243. The outer connecting part 241 is connected to the metal shell 1, and the inner connecting part 243 is connected to the first short side 222 and / or the connecting wall 232.

[0097] In this embodiment, as Figure 2 , Figure 3 , Figures 5 to 9 As shown, by setting a centering support 24, the outer connecting part 241 of the centering support 24 is connected to the metal shell 1, and the inner connecting part 243 is connected to the first short side 222 and / or the connecting wall 232. In this way, the centering support 24 is used to center the voice coil 22.

[0098] Understandably, the outer connecting part 241 of the centering support piece 24 is provided with an outer solder pad, which is used to connect and conduct with an external circuit. The inner connecting part 243 of the centering support piece 24 is provided with an inner solder pad, which is electrically connected to the lead wire of the voice coil 22. In this way, the centering support piece 24 can both center the voice coil 22 and connect the voice coil 22 to the external circuit.

[0099] It should be noted that the deformable portion 242 of the centering support 24 can deform during the vibration of the voice coil 22. To ensure the deformation capability of the deformable portion 242 of the centering support 24, the deformable portion 242 may optionally have at least one bend, which is not limited here. In this embodiment, the outer connecting portion 241, the deformable portion 242, and the inner connecting portion 243 of the centering support 24 may be an integrally formed structure.

[0100] In this embodiment, as Figure 2 , Figure 3 , Figures 5 to 9 As shown, by setting two centering supports 24, the two centering supports 24 are respectively set at both ends of the sound-generating device 100 along the second direction. In this way, the two centering supports 24 are set on the short axis of the sound-generating device 100, reducing the volume occupied, thereby avoiding the centering supports 24 occupying the volume of the long axis of the sound-generating device 100, thus ensuring the volume of the magnetic circuit system 3.

[0101] Optionally, such as Figure 6 , Figure 9As shown, the inner connecting portion 243 of the centering support 24 is connected to the first short side 222, for example, the inner connecting portion 243 is connected to the side surface 225 of the first short side 222; or, the inner connecting portion 243 is connected to the bottom surface 224 of the first short side 222. Alternatively, the inner connecting portion 243 of the centering support 24 is connected to the connecting wall 232, for example, the inner connecting portion 243 is connected to the end of the third segment 2323 of the connecting wall 232 away from the second segment 2322; or, the connecting wall 232 also includes an edge portion 2327 extending from the third segment 2323 along a second direction, and the inner connecting portion 243 is connected to the edge portion 2327; or, the inner connecting portion 243 is connected to the vertical wall 2324 of the connecting wall 232; or, the inner connecting portion 243 is connected to the support wall 2325 of the connecting wall 232; or, the inner connecting portion 243 is connected to the edge portion 2327 of the connecting wall 232. Or, as... Figure 8 As shown, the inner connecting portion 243 of the centering support 24 is connected to the first short side 222 and the connecting wall 232. For example, the inner connecting portion 243 is connected to the side surface 225 of the first short side 222 and the end of the third segment 2323 of the connecting wall 232 away from the second segment 2322; or, the inner connecting portion 243 is connected to the side surface 225 of the first short side 222 and the edge portion 2327 of the connecting wall 232. This is not limited here.

[0102] In one embodiment, the magnetic circuit assembly 32 includes a first magnet 321, a magnetic guide plate 322 and a second magnet 323 stacked along a first direction, with the second magnet 323 connected to the base plate 311.

[0103] In this embodiment, as Figures 3 to 5 As shown, the first magnet 321, the magnetic guide plate 322, and the second magnet 323 of the magnetic circuit assembly 32 are stacked along the first direction, and the second magnet 323 of the magnetic circuit assembly 32 is connected to the magnetic yoke 31, that is, the second magnet 323 is connected to the base plate 311 of the magnetic yoke 31. In this way, the magnetic circuit assembly 32 can be connected and fixed, and the second magnet 323 can form a magnetic circuit with the base plate 311, the side plate 312, and the magnetic guide plate 322 of the magnetic yoke 31, and the first magnet 321 can form another magnetic circuit with the magnetic guide plate 322 and the side plate 312. The magnetic field lines of the two magnetic circuits can be concentrated through the magnetic guide plate 322 and pass through the voice coil 22.

[0104] Optionally, at least a portion of the voice coil 22 is opposite to the magnetic plate 322 along a plane perpendicular to the first direction. In this embodiment, as... Figure 3 , Figure 4 As shown, at least a portion of the voice coil 22 is opposite to the magnetic plate 322 along the second or third direction. This arrangement ensures that more magnetic field lines pass through the voice coil 22, thereby increasing the driving force on the voice coil 22 and improving the BL value.

[0105] In this embodiment, as Figure 3 , Figure 4 As shown, the first magnet 321 and the second magnet 323 are both magnetized along the first direction but in opposite directions. This arrangement causes the magnetic circuit assembly 32 to form a magnetic pair structure, that is, the first magnet 321 and the second magnet 323 form a magnetic pair structure. At this time, a relatively long magnetic field region with a relatively uniform magnetic field distribution is formed between the first magnet 321 and the second magnet 323 in the first direction, making the magnetic field lines more dense and uniform. When the voice coil 22 reciprocates along the first direction, it can be in the dense magnetic field line region, thereby making the BLx curve flatter and reducing distortion.

[0106] Optionally, the ratio of the thickness of the first magnet 321 along the first direction to the thickness of the second magnet 323 along the first direction is 1:3 to 1:1. In this embodiment, by setting the thickness of the second magnet 323 along the first direction to be greater than or equal to the thickness of the first magnet 321 along the first direction, it is ensured that the magnetic circuit assembly 32 forms a magnetic field strength of the two magnetic loops formed in the magnetic structure relative to the voice coil 22. This ensures that the voice coil 22 can be in the magnetic field region formed between the first magnet 321 and the second magnet 323 when it reciprocates along the first direction, ensuring that more magnetic field lines pass through the voice coil 22, thereby making the BLx curve flatter and reducing distortion.

[0107] Optionally, the ratio of the thickness of the first magnet 321 along the first direction to the thickness of the second magnet 323 along the first direction is 1:3, 1:2, 1:1, etc., and is not limited here.

[0108] 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.

[0109] 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.

[0110] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents 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 patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: Metal casing, the metal casing is ring-shaped; A vibration system vibrates along a first direction, comprising a diaphragm assembly, two voice coils, and two frames. The outer periphery of the diaphragm assembly is connected to one end of a metal housing. The two voice coils are spaced apart along a second direction. Each voice coil has two first long straight sides extending along the second 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. The ratio of the size of the voice coil along the second direction to the size of the voice coil along a third direction is 4:1 to 9:

1. Each frame connects one voice coil and the diaphragm assembly. Each frame includes a top wall and two connecting walls extending from both ends of the top wall along the second direction. The two connecting walls are respectively connected to the two first short sides of each voice coil. The first direction, the second direction, and the third direction are arranged perpendicularly to each other. A magnetic circuit system, the magnetic circuit system including a magnetic yoke and two magnetic circuit components spaced apart from the magnetic yoke along a second direction, each voice coil surrounding one of the magnetic circuit components, the magnetic yoke including a base plate and a side plate bent and extended from the periphery of the base plate, the two magnetic circuit components spaced apart from the base plate along the second direction, the side plate being welded to the end of the metal housing away from the diaphragm assembly; The voice coil has a top surface facing the diaphragm assembly, a bottom surface facing away from the diaphragm assembly, and a side surface connecting the top surface and the bottom surface, and the connecting wall is connected to the side surface.

2. The sound-generating device as described in claim 1, characterized in that, The vibration system further includes two centering supports, which are respectively located at both ends of the sound-generating device along the second direction. The centering support includes an outer connecting part, a deformation part, and an inner connecting part. The outer connecting part is connected to the metal shell, and the inner connecting part is connected to the first short side and / or the connecting wall.

3. The sound-generating device as described in claim 2, characterized in that, The connecting wall includes a vertical wall extending along the first direction and a supporting wall extending from the vertical wall by bending along the second direction. The vertical wall is connected to the side surface, and the supporting wall is connected to the bottom surface. The inner connecting part is connected to the side or the supporting wall.

4. The sound-generating device as described in claim 2, characterized in that, The connecting wall includes a vertical segment extending along the first direction and an edge portion extending from the vertical segment by bending along the second direction. The vertical segment is connected to the side surface, and the inner connecting portion is connected to the edge portion.

5. The sound-generating device as described in claim 1, characterized in that, The outer wall of the side plate is flush with the outer wall of the metal shell; And / or, the side plate includes two, and the two side plates are respectively formed by bending and extending the two long sides of the bottom plate along the second direction; And / or, the metal casing includes an annular body extending along the first direction, the thickness of the annular body being 0.2mm to 0.8mm.

6. The sound-generating device as claimed in claim 1, characterized in that, The magnetic circuit assembly includes a first magnet, a magnetic guide plate, and a second magnet stacked along the first direction, wherein the second magnet is connected to the base plate. Wherein, along the second direction or the third direction upward, at least a portion of the voice coil is opposite to the magnetic plate; And / or, the ratio of the thickness of the first magnet along the first direction to the thickness of the second magnet along the first direction is 1:3 to 1:1; And / or, both the first magnet and the second magnet are magnetized along the first direction but in opposite directions.

7. The sound-generating device as claimed in claim 1, characterized in that, The diaphragm assembly includes a diaphragm and a vibrating plate. The diaphragm includes a central part, a folded ring part, and a fixing part connected in sequence. The fixing part is connected to one end of the metal shell, and the vibrating plate is connected to the central part. The vibrating plate is located on the side of the central part facing away from the voice coil, and the top wall is connected to the central part; Alternatively, the diaphragm is located on the side of the central portion facing the voice coil, and the top wall is connected to the diaphragm.

8. The sound-generating device as claimed in claim 7, characterized in that, The distance between the two first long straight edges is greater than the dimension of the vibrating plate along the third direction; And / or, the dimension of the top wall along the third direction is not greater than the dimension of the vibrating plate along the third direction; And / or, the ratio of the dimension of the top wall along the third direction to the dimension of the vibrating plate along the third direction is 1:2 to 1:1; And / or, the top wall is provided with multiple through holes; wherein, the multiple through holes are irregularly distributed; or, the multiple through holes are arranged in an array.

9. The sound-generating device as claimed in claim 1, characterized in that, The sound-generating device has a length along the second direction and a width along the third direction, and the ratio of the length to the width of the sound-generating device is 4:1 to 10:

1.

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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