Sound generating device

Abstract

This invention relates to the field of electroacoustic conversion, and more particularly to a sound-generating device, comprising a frame, a vibration system fixed to the frame, and a magnetic circuit system for driving the vibration system to generate sound. The vibration system includes a diaphragm fixed to the frame and a voice coil that drives the diaphragm to vibrate. The frame includes a ring-shaped metal frame and plastic portions respectively injection-molded into the metal frame and covering a portion of the metal frame. The magnetic circuit system is fixedly connected to the metal frame by welding. The sound-generating device also includes conductive solder pads embedded in the plastic portions and exposed for introducing external electrical signals. The voice coil is electrically connected to the conductive solder pads. Compared with the prior art, the magnetic circuit system of the frame and lower clamp of this invention is increased, improving the connection and fixation effect between the frame and the magnetic circuit system. At the same time, since the flexible circuit board is housed in the clearance space and extends along the length direction of the clearance space, the conductivity reliability of the sound-generating device is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic conversion, and more particularly to a sound-generating device. Background Technology

[0002] A sound-generating device is an electroacoustic transducer that converts electrical signals into sound signals. It is widely used in audio equipment, communication terminals, automotive electronics, and many other fields, and is a core component for sound propagation. Its basic structure typically includes a vibration system, a magnetic circuit system, and a support system. The vibration system mainly consists of a diaphragm and a voice coil. The magnetic circuit system generally includes magnets, an upper clamp, and a lower clamp. The frame is a crucial part of the support system, playing a vital role in connecting and fixing the vibration system and the magnetic circuit system, ensuring that all components work together to achieve stable sound output.

[0003] Currently, the design and fixing methods of washbasins in the industry mainly suffer from two types of technical defects, making it difficult to simultaneously meet the comprehensive requirements of strength, insulation, space occupation, and reliable fixing:

[0004] Firstly, in terms of the design of the basin frame structure, existing solutions often adopt two types: all-metal basin frames or all-plastic basin frames, but both have obvious shortcomings.

[0005] All-metal basket frames pose a risk of electrical conductivity when in direct contact with conductive solder pads. Therefore, additional insulating components (such as insulating gaskets and coatings) are required to isolate the conductive solder pads. Furthermore, the connection method between the metal basket frame and the magnetic circuit system results in too few spot welds, leading to insufficient fixing strength and affecting the reliability of the sound-generating device. This method not only increases the number of parts and assembly steps but also occupies the limited internal space of the electroacoustic device. Some solutions use larger flexible printed circuits (FPCs) to replace solder pads to avoid the space occupied by insulating components. However, the size and flexibility of FPCs further compress the installation space of the magnetic circuit system, and their connection stability with the basket frame is poor, which can adversely affect the fixing accuracy of the basket frame and the magnetic circuit system, leading to problems such as loose parts and performance fluctuations during equipment operation.

[0006] Although all-plastic basket frames can achieve insulation between the conductive solder pads and the basket frame body through the material itself, eliminating the need for additional insulation components, the structural strength of plastic is far lower than that of metal. To meet the support requirements, the overall volume of the basket frame needs to be increased (such as increasing the wall thickness and expanding the outline dimensions) to improve strength. This will significantly occupy the internal space of the electroacoustic device, which goes against the current development trend of miniaturization and thinning of equipment, making it difficult to be suitable for scenarios with high spatial precision requirements.

[0007] Secondly, existing technologies mostly employ adhesive bonding to fix the frame and lower clamping system components (such as the lower clamping plate). Adhesive bonding relies on the adhesive force to connect the frame and lower clamping plate. However, limited by the coating process and curing characteristics of the adhesive, the effective contact area of ​​the adhesive region is usually small, and the bonding strength is easily weakened by environmental factors such as temperature and humidity. During long-term operation of electroacoustic devices, the magnetic circuit system will vibrate or be subjected to stress. The small adhesive area cannot provide sufficient fixing force, easily leading to problems such as separation of the frame and lower clamping plate, relative displacement, etc., directly affecting the stability of the magnetic circuit system, and consequently causing sound quality distortion and shortened lifespan of the equipment.

[0008] Therefore, it is necessary to provide a new sound-generating device to solve the above-mentioned technical problems. Summary of the Invention

[0009] The purpose of this invention is to provide a new sound-generating device to solve the problems of insufficient spot welding positions and poor conductivity reliability in the prior art.

[0010] To achieve the above objectives, the present invention provides a sound-generating device, including a basket frame, a vibration system fixed to the basket frame, and a magnetic circuit system for driving the vibration system to generate sound. The vibration system includes a diaphragm fixed to the basket frame and a voice coil for driving the diaphragm to vibrate. The magnetic circuit system is fixed to the basket frame and has a magnetic gap, and the voice coil is inserted into the magnetic gap.

[0011] The basin frame includes a ring-shaped metal basin frame and plastic parts that are respectively injection molded into the metal basin frame and wrap around a portion of the metal basin frame. The magnetic circuit system is fixedly connected to the metal basin frame by welding. The sound-generating device also includes a conductive solder piece, which is embedded in the plastic part and partially exposed for introducing external electrical signals. The voice coil is electrically connected to the conductive solder piece.

[0012] The metal frame includes two fixed walls disposed on opposite sides of the magnetic circuit system. The thickness direction of the fixed walls is parallel to the vibration direction of the diaphragm. The side of the magnetic circuit system facing away from the vibration system is welded and fixed to the two fixed walls respectively.

[0013] Preferably, the metal frame further includes two connecting walls respectively disposed on the other opposite sides of the magnetic circuit system, and two baffles extending from the sides of the two fixed walls that are far apart from each other, bent towards the diaphragm along the vibration direction; each of the connecting walls is connected to the two fixed walls and together forms a ring structure;

[0014] The plastic part comprises two parts, each of which wraps around one of the two connecting walls, and the two ends of each plastic part are bent and extended to abut against the two baffles.

[0015] Preferably, the magnetic circuit system further includes a lower clamping plate, a first flange formed by bending the opposite sides of the lower clamping plate, and a main magnet fixed to the lower clamping plate, wherein the first flange and the main magnet are spaced apart to form the magnetic gap; the opposite sides of the lower clamping plate are respectively fixed to the side of the two fixed walls that are close to each other, and the two first flanges are respectively spaced apart from the two baffles, wherein the baffles, the fixed walls and the first flanges located on the same side of the lower clamping plate together form a clearance space; the sound-generating device further includes a flexible circuit board, which is housed in the clearance space and extends along the length of the clearance space, the voice coil is electrically connected to the flexible circuit board, and the flexible circuit board is electrically connected to the conductive solder pad.

[0016] Preferably, the connecting wall includes a first connecting wall, a second connecting wall extending from opposite ends of the first connecting wall toward the fixed wall, and a third connecting wall extending from the second connecting wall away from the diaphragm and connected to the fixed wall.

[0017] Preferably, the baffle wall has a through hole extending through it along the vibration direction perpendicular to the diaphragm, and a damping adjustment mesh fixed to the side of the baffle wall away from the main magnet and covering the through hole.

[0018] Preferably, each of the plastic parts includes a plastic part body, two first extensions formed by extending from opposite ends of the plastic part body toward the other plastic part, and two second extensions formed by extending forward from the two first extensions. The plastic part body wraps around the connecting wall, and the connecting wall forms two corners with the two fixed walls. The first extensions wrap around the two corners and extend to abut against the corresponding fixed walls. The two second extensions extend into the two clearance spaces and abut against the side of the two fixed walls near the diaphragm. The two ends of each flexible circuit board are supported by the two second extensions in the corresponding clearance spaces.

[0019] Preferably, the metal basin frame has a rectangular structure, the fixed wall is disposed on the long axis side of the metal basin frame, and the connecting wall is disposed on the short axis side of the metal basin frame.

[0020] Preferably, the conductive solder sheet and the plastic part are integrally injection molded.

[0021] Preferably, the conductive pad includes a first pad portion embedded in the plastic portion, a second pad portion extending from one end of the first pad portion toward the flexible circuit board and exposed in the plastic portion, and a third pad portion extending from the other end of the first pad portion toward the direction away from the diaphragm and exposed in the plastic portion; the second pad portion is electrically connected to the flexible circuit board, and the third pad portion is used to introduce external electrical signals.

[0022] Preferably, the magnetic circuit system further includes two second flanges formed by bending the other opposite sides of the lower clamping plate. The second flanges are spaced apart from the main magnet, and adjacent first flanges and second flanges are spaced apart to form a clearance space; the main magnet, the first flanges and the second flanges together form the magnetic gap.

[0023] The flexible circuit board includes a circuit board body housed in the clearance space and a first pad portion and a second pad portion extending outward from opposite ends of the circuit board body. The first pad portion and the second pad portion are housed in the clearance space. The first pad portion is electrically connected to the lead of the voice coil, and the second pad portion is electrically connected to the conductive pad.

[0024] Compared with the prior art, the basket frame of the present invention includes a ring-shaped metal basket frame and plastic parts respectively injection molded into the metal basket frame and covering a portion of the metal basket frame. The magnetic circuit system is fixedly connected to the metal basket frame by welding. The sound-generating device also includes conductive solder pads, which are embedded in the plastic parts and exposed for introducing external electrical signals. The voice coil is electrically connected to the conductive solder pads. The metal basket frame includes two fixed walls disposed on opposite sides of the magnetic circuit system. The thickness direction of the fixed walls is parallel to the vibration direction of the diaphragm. The side of the magnetic circuit system facing away from the vibration system is welded and fixed to the two fixed walls respectively. Since the side of the fixed wall facing away from the diaphragm and perpendicular to the thickness direction is welded and fixed to the side of the magnetic circuit system facing away from the diaphragm, the surface of the fixed wall perpendicular to the thickness direction has a larger surface area, thereby increasing the number of spot welding positions between the basket frame and the magnetic circuit system and improving the connection and fixing effect between the basket frame and the magnetic circuit system. At the same time, since the flexible circuit board is housed in the clearance space and extends along the length direction of the clearance space, the space of the voice coil is not restricted, allowing the voice coil to be made larger, effectively improving the conductivity reliability of the sound-generating device and improving the acoustic performance of the sound-generating device. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort, wherein:

[0026] Figure 1 A three-dimensional structural schematic diagram of the sound-generating device provided in an embodiment of the present invention;

[0027] Figure 2 An exploded three-dimensional structural diagram of the sound-generating device provided in an embodiment of the present invention;

[0028] Figure 3 For along Figure 1 Cross-sectional view of line AA in the middle;

[0029] Figure 4 For along Figure 1 Cross-sectional view of the middle BB line;

[0030] Figure 5 This is a schematic diagram of the combined structure of the sound-generating device frame and the flexible circuit board provided in an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the combined structure of the frame and lower clamp of the sound-generating device provided in an embodiment of the present invention;

[0032] Figure 7 For along Figure 5 Cross-sectional view of the CC line.

[0033] In the diagram, 100 is the sound-generating device; 1 is the basket frame; 11 is the metal basket frame; 111 is the fixed wall; 112 is the connecting wall; 1121 is the first connecting wall; 1122 is the second connecting wall; 1123 is the third connecting wall; 113 is the baffle; 114 is the corner; 115 is the through hole; 12 is the plastic part; 12a is the first plastic part; 12b is the second plastic part; 121 is the plastic part body; 122 is the first extension; 123 is the second extension; 2 is the vibration system. 21. Diaphragm; 22. Voice coil; 3. Magnetic circuit system; 31. Lower clamping plate; 311. First flange; 312. Second flange; 32. Main magnet; 33. Upper clamping plate; 34. Magnetic gap; 4. Damping adjustment mesh; 5. Conductive solder pad; 51. First solder pad section; 52. Second solder pad section; 53. Third solder pad section; 6. Flexible circuit board; 61. Circuit board body; 62. First solder pad section; 63. Second solder pad section; 7. Clearance space; 8. Avoidance space. Detailed Implementation

[0034] 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.

[0035] Combination Figures 1 to 7As shown, this embodiment of the invention provides a sound-generating device 100, including a basket frame 1, a vibration system 2 fixed to the basket frame 1, and a magnetic circuit system 3 for driving the vibration system 2 to generate sound. The vibration system 2 includes a diaphragm 21 fixed to the basket frame 1 and a voice coil 22 for driving the diaphragm 21 to vibrate. The magnetic circuit system 3 is fixed to the basket frame 1 and has a magnetic gap 34, and the voice coil 22 is inserted into the magnetic gap 34.

[0036] The basin frame 1 includes a ring-shaped metal basin frame 11 and plastic parts 12 that are respectively injection molded into the metal basin frame 11 and wrap around a portion of the metal basin frame 11. The magnetic circuit system 3 is fixedly connected to the metal basin frame 11 by welding. The sound-generating device 100 also includes a conductive solder piece 5, which is embedded in the plastic part 12 and exposed to the outside for introducing external electrical signals. The voice coil 22 is electrically connected to the conductive solder piece 5.

[0037] The metal basin frame 11 includes two fixed walls 111 disposed on opposite sides of the magnetic circuit system 3. The thickness direction of the fixed walls 111 is parallel to the vibration direction of the diaphragm 21. The side of the magnetic circuit system 3 facing away from the vibration system 2 is welded and fixed to the two fixed walls 111 respectively.

[0038] By welding and fixing the metal frame 11 to the magnetic circuit system 3, the connection and fixation effect between the metal frame 11 and the magnetic circuit system 3 is enhanced, thereby improving the stability of the sound-generating device 100. Simultaneously, since the plastic part 12 is injection molded into the metal frame 11, the connection between the plastic part 12 and the metal frame 11 is more stable, further enhancing the stability of the sound-generating device 100. The conductive solder piece 5 is embedded in the plastic part 12 and exposed; the plastic part 12 is non-conductive, thus preventing conductive interference with the metal frame 11 and reducing the space occupied by the conductive solder piece 5. Furthermore, since the thickness direction of the fixing wall 111 is parallel to the vibration direction of the diaphragm 21, the weldable area between the fixing wall 111 and the magnetic circuit system 3 is effectively increased, enhancing the welding strength and improving the reliability of the sound-generating device 100.

[0039] In this embodiment, the metal frame 11 further includes two connecting walls 112 respectively disposed on the other opposite sides of the magnetic circuit system 3, and two baffles 113 extending from the two fixed walls 111 away from each other, bending towards the diaphragm 21 along the vibration direction of the diaphragm 21; each of the connecting walls 112 is connected to the two fixed walls 111 and together form a ring structure;

[0040] The plastic part 12 includes two parts, each of which wraps around the two connecting walls 112. The two ends of each plastic part 12 are bent and extended to abut against the two baffle walls 113.

[0041] Since the fixed wall 111 is welded to the magnetic circuit system 3, there are more spot welding positions, which makes the connection and fixation effect between the metal frame 11 and the magnetic circuit system 3 better and increases the stability of the sound-generating device 100.

[0042] In this embodiment, the connecting wall 112 includes a first connecting wall 1121, a second connecting wall 1122 extending from the opposite ends of the first connecting wall 1121 toward the fixed wall 111, and a third connecting wall 1123 extending from the second connecting wall 1122 away from the diaphragm 21 and connected to the fixed wall 111. This creates a stepped structure with a height difference between the connecting wall 112 and the fixed wall 111, enhancing the connection strength between the metal frame 11 and the plastic part 12, improving the reliability of the frame 1, and also facilitating welding of the fixed wall 111 to the lower clamping plate 31.

[0043] In this embodiment, the magnetic circuit system 3 further includes a lower clamping plate 31, a first flange 311 formed by bending the opposite sides of the lower clamping plate 31, and a main magnet 32 ​​fixed to the lower clamping plate 31. The first flange 311 and the main magnet 32 ​​are spaced apart to form the magnetic gap 34. The opposite sides of the lower clamping plate 31 are respectively fixed to the side of the two fixed walls 111 that are close to each other, and the two first flanges 311 are respectively spaced apart from the two baffles 113. The baffles 113, the fixed walls 111 and the first flanges 311 located on the same side of the lower clamping plate 31 together form a clearance space 7. The sound generating device 100 further includes a flexible circuit board 6. The flexible circuit board 6 is housed in the clearance space 7 and extends along the length direction of the clearance space 7. The voice coil 22 is electrically connected to the flexible circuit board 6, and the flexible circuit board 6 is electrically connected to the conductive solder sheet 5.

[0044] The flexible circuit board 6 is housed within the clearance space 7 and extends along the length of the clearance space 7, thereby spacing it from the metal frame 11 and preventing short circuits in the metal frame 11. This effectively improves the conductivity reliability of the sound-generating device 100. Furthermore, since the flexible circuit board 6 is housed within the clearance space 7 and extends along the length of the clearance space 7, it does not occupy the housing space of the voice coil 22, allowing the voice coil 22 to be made larger and improving the acoustic performance of the sound-generating device 100.

[0045] In this embodiment, the baffle 113 is provided with a through hole 115 extending through it along the vibration direction perpendicular to the diaphragm 21, and a damping adjustment mesh 4 fixed to the side of the baffle 113 away from the main magnet 32 ​​and covering the through hole 115. The acoustic impedance of the cavity inside the sound-generating device 100 can be adjusted by the damping adjustment mesh 4, thereby improving the low-frequency sound-generating performance of the sound-generating device 100.

[0046] In this embodiment, each plastic part 12 includes a plastic part body 121, two first extensions 122 formed by extending from opposite ends of the plastic part body 121 toward the other plastic part 12, and two second extensions 123 formed by extending forward from the two first extensions 122. The plastic part body 121 wraps around the connecting wall 112, and the connecting wall 112 forms two corners 114 with the two fixed walls 111. The first extensions 122 wrap around the two corners 114 and extend to abut against the corresponding fixed walls 111. The two second extensions 123 extend into the two clearance spaces 7 and abut against the side of the two fixed walls 111 near the diaphragm 21. The two ends of each flexible circuit board 6 are supported by the two second extensions 123 in the corresponding clearance spaces 7.

[0047] The plastic portion 12 includes a first plastic portion 12a and a second plastic portion 12b. The first plastic portion 12a includes a plastic portion body 121, two first extension portions 122 extending from opposite ends of the plastic portion body 121 toward the other plastic portion 12, and two second extension portions 123 extending longitudinally from the two first extension portions 122. The second plastic portion 12b includes a plastic portion body 121 and two first extension portions 122 extending from opposite ends of the plastic portion body 121 toward the other plastic portion 12.

[0048] In this embodiment, the metal frame 11 has a rectangular structure, the fixed wall 111 is disposed on the long axis side of the metal frame 11, and the connecting wall 112 is disposed on the short axis side of the metal frame 11. By designing the metal frame 11 as a rectangular structure, the clearance space 7 is made larger, the flexible circuit board 6 is more easily accommodated in the clearance space 7, and the voice coil 22 can be designed to be larger along the long axis, effectively improving the acoustic performance of the sound-generating device 100.

[0049] In this embodiment, the conductive solder sheet 5 is integrally injection molded with the plastic part 12. This improves the stability of the conductive solder sheet 5 and saves internal space in the sound-generating device 100. The conductive solder sheet 5 comprises a plurality of pieces respectively embedded in the plastic part 12.

[0050] In this embodiment, the conductive solder pad 5 includes a first solder pad portion 51 embedded in the plastic portion 12, a second solder pad portion 52 extending from one end of the first solder pad portion 51 toward the flexible circuit board 6 and exposed in the plastic portion 12, and a third solder pad portion 53 extending from the other end of the first solder pad portion 51 toward the direction away from the diaphragm 21 and exposed in the plastic portion 12; the second solder pad portion 52 is electrically connected to the flexible circuit board 6, and the third solder pad portion 53 is used to introduce external electrical signals.

[0051] In this embodiment, the magnetic circuit system 3 further includes an upper clamping plate 33 fixed to the side of the main magnet 32 ​​away from the lower clamping plate 31. This increases the magnetic field strength of the sound-generating device 100 and improves its acoustic performance.

[0052] In this embodiment, the magnetic circuit system 3 further includes two second flanges 312 formed by bending the other opposite sides of the lower clamping plate 31. The second flanges 312 are spaced apart from the main magnet 32, and adjacent first flanges 311 and second flanges 312 are spaced apart to form a clearance space 8. The main magnet 32, the first flanges 311, and the second flanges 312 together form the magnetic gap 34. The first flanges 311 and the second flanges 312 can be wall structures made of the same material as the lower clamping plate 31, or they can be side magnets.

[0053] The flexible circuit board 6 includes a circuit board body 61 housed in the clearance space 7, and a first pad portion 62 and a second pad portion 63 extending outward from opposite ends of the circuit board body 61. The first pad portion 62 and the second pad portion 63 are housed in the clearance space 8. The first pad portion 62 is electrically connected to the lead of the voice coil 22, and the second pad portion 63 is electrically connected to the conductive solder pad 5. Because the circuit board body 61 is housed in the clearance space 7, and the first pad portion 62 and the second pad portion 63 are housed in the clearance space 8, no additional internal space is occupied by the sound-generating device 100, allowing the magnetic circuit system 3 to be made larger, thereby enhancing the magnetic field strength and improving the acoustic performance of the sound-generating device 100.

[0054] Compared with the prior art, the basket frame of the present invention includes a ring-shaped metal basket frame and plastic parts respectively injection molded into the metal basket frame and covering a portion of the metal basket frame. The magnetic circuit system is fixedly connected to the metal basket frame by welding. The sound-generating device also includes conductive solder pads, which are embedded in the plastic parts and exposed for introducing external electrical signals. The voice coil is electrically connected to the conductive solder pads. The metal basket frame includes two fixed walls disposed on opposite sides of the magnetic circuit system. The thickness direction of the fixed walls is parallel to the vibration direction of the diaphragm. The side of the magnetic circuit system facing away from the vibration system is welded and fixed to the two fixed walls respectively. Because the side of the fixed wall facing away from the diaphragm and perpendicular to the thickness direction is welded and fixed to the side of the magnetic circuit system facing away from the diaphragm, the surface of the fixed wall perpendicular to the thickness direction has a larger surface area, thereby increasing the number of spot welding positions between the basket frame and the magnetic circuit system and improving the connection and fixing effect between the basket frame and the magnetic circuit system. At the same time, because the flexible circuit board is housed in the clearance space and extends along the length direction of the clearance space, the space of the voice coil is not restricted, allowing the voice coil to be made larger, effectively improving the conductivity reliability of the sound-generating device and improving the acoustic performance of the sound-generating device.

[0055] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A sound-generating device, comprising a frame, a vibration system fixed to the frame, and a magnetic circuit system for driving the vibration system to generate sound, wherein the vibration system includes a diaphragm fixed to the frame and a voice coil for driving the diaphragm to vibrate; the magnetic circuit system is fixed to the frame and has a magnetic gap, and the voice coil is inserted into the magnetic gap, characterized in that, The basin frame includes a ring-shaped metal basin frame and plastic parts that are respectively injection molded into the metal basin frame and wrap around a portion of the metal basin frame. The magnetic circuit system is fixedly connected to the metal basin frame by welding. The sound-generating device also includes a conductive solder piece, which is embedded in the plastic part and partially exposed for introducing external electrical signals. The voice coil is electrically connected to the conductive solder piece. The metal frame includes two fixed walls disposed on opposite sides of the magnetic circuit system. The thickness direction of the fixed walls is parallel to the vibration direction of the diaphragm. The side of the magnetic circuit system facing away from the vibration system is welded and fixed to the two fixed walls respectively. The metal frame also includes two connecting walls respectively disposed on the other opposite sides of the magnetic circuit system, and two baffles extending from the side of the two fixed walls that are far apart from each other, bending towards the diaphragm along the vibration direction; each of the connecting walls is connected to the two fixed walls and together forms a ring structure; The plastic part includes two parts, each of which wraps around the two connecting walls. The two ends of each plastic part are bent and extended to abut against the two baffles. The magnetic circuit system further includes a lower clamping plate, a first flange formed by bending the opposite sides of the lower clamping plate, and a main magnet fixed to the lower clamping plate. The first flange and the main magnet are spaced apart to form the magnetic gap. The opposite sides of the lower clamping plate are respectively fixed to the side of the two fixed walls that are close to each other, and the two first flanges are respectively spaced apart from the two baffles. The baffles, the fixed walls, and the first flanges located on the same side of the lower clamping plate together form a clearance space. The sound-generating device further includes a flexible circuit board, which is housed in the clearance space and extends along the length of the clearance space. The voice coil is electrically connected to the flexible circuit board, and the flexible circuit board is electrically connected to the conductive solder pad.

2. The sound-generating device as described in claim 1, characterized in that, The connecting wall includes a first connecting wall, a second connecting wall extending from opposite ends of the first connecting wall toward the fixed wall, and a third connecting wall extending from the second connecting wall away from the diaphragm and connected to the fixed wall.

3. The sound-generating device as described in claim 1, characterized in that, The baffle wall is provided with a through hole extending through it along the vibration direction perpendicular to the diaphragm, and a damping adjustment mesh fixed to the side of the baffle wall away from the main magnet and covering the through hole.

4. The sound-generating device as described in claim 1, characterized in that, Each of the plastic parts includes a plastic part body, two first extensions formed by extending from opposite ends of the plastic part body toward the other plastic part, and two second extensions formed by extending forward from the two first extensions. The plastic part body wraps around the connecting wall, and the connecting wall forms two corners with the two fixed walls. The first extensions wrap around the two corners and extend to abut against the corresponding fixed walls. The two second extensions extend into the two clearance spaces and abut against the side of the two fixed walls near the diaphragm. The two ends of each flexible circuit board are supported by the two second extensions in the corresponding clearance spaces.

5. The sound-generating device as described in claim 1, characterized in that, The metal basin frame has a rectangular structure, the fixed wall is located on the long axis side of the metal basin frame, and the connecting wall is located on the short axis side of the metal basin frame.

6. The sound-generating device as described in claim 1, characterized in that, The conductive solder pad is integrally injection molded with the plastic part.

7. The sound-generating device as described in claim 1, characterized in that, The conductive solder pad includes a first solder pad portion embedded in the plastic portion, a second solder pad portion extending from one end of the first solder pad portion toward the flexible circuit board and exposed in the plastic portion, and a third solder pad portion extending from the other end of the first solder pad portion toward the direction away from the diaphragm and exposed in the plastic portion; the second solder pad portion is electrically connected to the flexible circuit board, and the third solder pad portion is used to introduce external electrical signals.

8. The sound-generating device as described in claim 4, characterized in that, The magnetic circuit system also includes two second flanges formed by bending the other opposite sides of the lower clamping plate. The second flanges are spaced apart from the main magnet, and the adjacent first flanges and second flanges are spaced apart to form a clearance space. The main magnet, the first flanges and the second flanges together form the magnetic gap. The flexible circuit board includes a circuit board body housed in the clearance space and a first pad portion and a second pad portion extending outward from opposite ends of the circuit board body. The first pad portion and the second pad portion are housed in the clearance space. The first pad portion is electrically connected to the lead of the voice coil, and the second pad portion is electrically connected to the conductive pad.

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