A sound-generating device

Abstract

The present invention discloses a sound-generating device, comprising a vibration system and a magnetic circuit system, wherein the vibration system comprises a diaphragm and a voice coil combined with the diaphragm, the magnetic circuit system forms a magnetic gap, the voice coil extends into the magnetic gap, the diaphragm comprises a vibration part located in the center and a folding ring part with a raised structure arranged around the vibration part; the vibration system also comprises a rigid skeleton structure fixedly connected to and arranged around the diaphragm, the skeleton structure comprises an inner fixing part, an outer fixing part, and an extension part connected between the inner fixing part and the outer fixing part and protruding toward the magnetic gap direction; the inner top is connected to the outer edge of the vibration part, the outer fixing part is connected to the inner edge of the folding ring part; the upper end of the voice coil is connected to the lower end of the extension part. The sound-generating device of the present invention has better acoustic performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic conversion, and in particular to a sound generating device. Background Art

[0002] Micro sound generators are important electro-acoustic conversion components in mobile communication devices, used to convert electrical signals into sound. They are used to form components such as speakers, receivers, and earphones in mobile communication devices. With the development of the mobile communication equipment industry, the micro sound generator industry has developed rapidly, and the requirements for the performance of micro sound generators are getting higher and higher.

[0003] Among them, the dynamic coil sound-generating device is a specific sound-generating device structure widely used in mobile communication equipment. The existing dynamic coil sound-generating device usually includes a shell and a vibration system and a magnetic circuit system fixed on the shell. Among them, the vibration system includes a diaphragm and a voice coil. The magnetic circuit system forms a magnetic gap to accommodate the voice coil. After current is passed through the voice coil, the voice coil is vibrated by force under the action of the magnetic field of the magnetic circuit system, thereby driving the diaphragm to vibrate and produce sound.

[0004] However, for the dynamic sound-generating device of the above-mentioned traditional structure, since the voice coil is in direct contact with the bottom of the diaphragm, the position of the voice coil in the magnetic gap cannot be freely adjusted, and most of the structure of the voice coil is located above the position of the dense magnetic flux lines. The driving force factor BL value (the length of the wire L for a certain number of turns multiplied by the magnetic flux density per unit area B) is not high, and the magnetic field cannot be fully utilized. This is mainly because the magnetic field utilization rate is low when the voice coil vibrates upward, resulting in an unbalanced driving force when the voice coil vibrates up and down, poor symmetry of the BL curve, and further poor amplitude symmetry of the vibration system. The sound-generating device has high distortion and low sensitivity, which affects the acoustic performance of the sound-generating device. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the problems in the prior art and provide a sound-generating device with better acoustic performance.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a sound-generating device, comprising a vibration system and a magnetic circuit system, wherein the vibration system comprises a diaphragm and a voice coil combined with the diaphragm, the magnetic circuit system forms a magnetic gap, and the voice coil extends into the magnetic gap.

[0007] The diaphragm comprises a vibration part located in the center and a folding ring part with a convex structure arranged around the vibration part;

[0008] The vibration system also includes a rigid skeleton structure fixedly connected to the diaphragm and arranged around it, the skeleton structure including an inner fixing portion, an outer fixing portion, and an extension portion connected between the inner fixing portion and the outer fixing portion and protruding toward the magnetic gap direction;

[0009] The inner top is connected to the outer edge of the vibration part, and the outer fixing part is connected to the inner edge of the folding ring part;

[0010] The upper end of the voice coil is connected to the lower end of the extension portion.

[0011] Preferably, the outer edge of the vibration part and the inner edge of the folding ring part are both located on the upper side of the skeleton structure, the outer edge of the vibration part is connected to the upper surface of the inner fixed part, and the inner edge of the folding ring part is connected to the upper surface of the outer fixed part.

[0012] Preferably, the outer edge of the vibration part and the inner edge of the folding ring part are both located at the lower side of the skeleton structure, the outer edge of the vibration part is connected to the lower surface of the inner fixing part, and the inner edge of the folding ring part is connected to the lower surface of the outer fixing part;

[0013] Alternatively, one of the outer edge of the vibration part and the inner edge of the folding ring part is located on the upper side of the skeleton structure, and the other is located on the lower side of the skeleton structure.

[0014] Preferably, the width of the extension portion decreases gradually from top to bottom; or, the width of the extension portion is consistent from top to bottom.

[0015] Preferably, the skeleton structure is made of metal material.

[0016] Preferably, the metal material is one of aluminum, aluminum-magnesium alloy, aluminum-lithium alloy and titanium alloy.

[0017] Preferably, the skeleton structure is made of a rigid plastic material or a carbon fiber material; wherein the rigid plastic material is one of PET, PEI, PEN, and PI.

[0018] Preferably, the extension portion is formed by stamping and bending a middle section of a plate material for making the skeleton structure.

[0019] Preferably, the thickness of the skeleton structure is less than or equal to 0.3 mm.

[0020] Preferably, the extension portion is formed by locally thickening the middle section of a plate material for making the skeleton structure.

[0021] Preferably, the raised structure of the folding ring portion is arranged downward; and a centering structure for elastically supporting the voice coil is arranged at the bottom of the voice coil, and the centering structure is distributed at the four corners of the voice coil.

[0022] After adopting the above technical solution, the beneficial effects of the present invention are:

[0023] The sound-generating device of the present invention adds a rigid skeleton structure between the vibration part and the folding ring part of the diaphragm, and the skeleton structure has an extension part protruding toward the direction of the magnetic gap, which is used to connect with the upper end of the voice coil. Through the above-mentioned structural design, when the position of the diaphragm remains unchanged, the position of the voice coil in the magnetic gap can be freely adjusted by adjusting the height of the extension part, so that the voice coil structure is located as much as possible in the area with dense magnetic flux lines, thereby improving the utilization rate of the magnetic field, especially the utilization rate of the magnetic field when the voice coil vibrates upward, improving the symmetry of the BL curve, making the driving force when the voice coil vibrates up and down more balanced, thereby improving the amplitude symmetry of the vibration system, effectively reducing the distortion of the sound-generating device, especially the low-frequency distortion, improving the sensitivity of the sound-generating device, and improving the acoustic performance of the sound-generating device as a whole.

[0024] Moreover, in the sound-generating device of the present invention, the skeleton structure is an independent component, which is connected to the vibration part and the folding ring part through the inner fixing part and the outer fixing part respectively. Therefore, the material selection and structural design of the skeleton structure are more flexible, and the installation position relationship with the vibration part and the folding ring part can also be freely combined according to the actual application situation, which is more feasible. In addition, the skeleton structure adopts an independent structure surround, and there is a hollow hole in the middle. When assembling with the voice coil, it can be positioned through the hollow hole in the middle, thereby improving the assembly accuracy between the two.

[0025] Furthermore, the skeleton structure of the present invention is connected to the vibration part and the folding ring part through the inner fixing part and the outer fixing part respectively, which is conducive to reducing the thickness compared with the assembly method in which the outer edge of the vibration part, the inner edge of the folding ring and the skeleton structure are stacked up and down in sequence. In addition, in the structure of the present invention, there is a gap between the vibration part and the folding ring part, which is more conducive to the heat dissipation generated by the voice coil, especially when the skeleton structure is made of metal material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 It is a schematic diagram of the exploded structure of the sound-generating device according to an embodiment of the present invention;

[0028] Figure 2 It is a schematic cross-sectional structure diagram of a sound-generating device according to an embodiment of the present invention;

[0029] Figure 3 for Figure 2 A partial enlarged view of the structure in the middle;

[0030] Figure 4 It is a schematic diagram comparing the BL(X) curves of the sound-generating device of the present invention and the sound-generating device in the prior art;

[0031] Figure 5 A schematic diagram comparing vibration displacement curves of the sound-generating device of the present invention and the sound-generating device in the prior art;

[0032] Figure 6 It is a schematic diagram comparing the test curves (SPL curves) of loudness at different frequencies of the sound-generating device of the present invention and the sound-generating device in the prior art;

[0033] Figure 7 The figure is a schematic diagram comparing the harmonic distortion test curves of the sound-generating device of the present invention and the sound-generating device in the prior art.

[0034] Description of Figure Numbers:

[0035] 1. Magnetic yoke, 21. Center magnet, 22. Center magnetic plate, 31. Side magnet, 32. Side magnetic plate, 4. Diaphragm, 41. Vibrating part, 42. Folding ring part, 5. Skeleton structure, 51. Internal fixing part, 52. External fixing part, 53. Extension part, 6. Voice coil, 7. Centering support plate.

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] The present invention provides a sound-generating device, which can be used in electronic devices capable of generating sound, such as earphones and mobile phones.

[0041] Please refer to Figure 1-Figure 3 As shown, the sound-generating device specifically includes a vibration system and a magnetic circuit system, wherein the magnetic circuit system includes a magnetic yoke 1 and an inner magnetic circuit part and an outer magnetic circuit part arranged on the magnetic yoke 1, and a magnetic gap is formed between the inner magnetic circuit part and the outer magnetic circuit part. In this specific embodiment, the inner magnetic circuit part includes a central magnet 21 and a central magnetic plate 22 arranged on the central magnet 21, and the outer magnetic circuit part includes a side magnet 31 surrounding the central magnet 21 and a side magnetic plate 32 arranged on the side magnet 31. In this embodiment, four side magnets 31 are provided. In other embodiments, the magnetic circuit system is not limited to the above design. The vibration system includes a diaphragm 4 and a voice coil 6 combined with the diaphragm 4, and the voice coil 6 extends into the magnetic gap. The diaphragm 4 includes a vibration part 41 located in the center and a folding ring part 42 of a convex structure arranged around the vibration part 41. The vibration part 41 has high rigidity and light weight, and is used to generate sound radiation. The folding ring part 42 is used to elastically suspend the vibration part 41 and deforms when the vibration part 41 vibrates. When current is passed through the voice coil 6 , the voice coil 6 is forced to vibrate under the action of the magnetic field of the magnetic circuit system, thereby driving the diaphragm 4 to vibrate and produce sound.

[0042] In the present invention, the vibration system further includes a rigid skeleton structure 5 fixedly connected to the diaphragm 4 and arranged around it, and the skeleton structure 5 includes an inner fixing portion 51, an outer fixing portion 52, and an extension portion 53 connected between the inner fixing portion 51 and the outer fixing portion 52 and protruding toward the magnetic gap. The inner fixing portion 51 is connected to the outer edge of the vibration portion 41, and the outer fixing portion 52 is connected to the inner edge of the folding ring portion 42; the upper end of the voice coil 6 is connected to the lower end of the extension portion 53.

[0043] The design of the skeleton structure 5 allows the position of the voice coil 6 in the magnetic gap to be freely adjusted by adjusting the height of the extension portion 53 while the position of the diaphragm 4 remains unchanged, so that the voice coil 6 structure is located as close as possible to the area with dense magnetic flux lines, thereby improving the utilization rate of the magnetic field, especially the utilization rate of the magnetic field when the voice coil 6 vibrates upward, improving the symmetry of the BL curve, and making the driving force of the voice coil 6 more balanced when vibrating up and down, thereby improving the amplitude symmetry of the vibration system, effectively reducing the distortion of the sound-generating device, especially the low-frequency distortion, improving the sensitivity of the sound-generating device, and improving the acoustic performance of the sound-generating device as a whole.

[0044] Combination Figure 4 and Table 1 below, Figure 4 1 is a schematic diagram comparing the BL(X) curves of the sound-generating device of this embodiment with the sound-generating device in the prior art. Table 1 is a schematic diagram comparing the BL(X) curves of the sound-generating device of this embodiment with the sound-generating device in the prior art. Figure 4 The simulation results show that compared with the prior art, the BL value of the diaphragm 4 of the sound-generating device in this embodiment when vibrating upward is significantly improved compared with the prior art, and the structure of this embodiment improves the utilization rate of the magnetic field. The difference between the BL values ​​when the diaphragm 4 vibrates upward and downward is reduced, which effectively improves the symmetry of the BL curve.

[0045] Table 1:

[0046]

[0047] Combination Figure 5 As shown, Figure 5 The figure is a schematic diagram comparing the vibration displacement curves of the sound-generating device of this embodiment and the sound-generating device in the prior art. With the vertical coordinate 0 as the symmetry axis, in the prior art, at different frequencies, the amplitude of the diaphragm 4 when vibrating upward is significantly lower than the amplitude of the diaphragm 4 when vibrating downward, and the amplitude symmetry is very poor. Compared with the prior art, this embodiment improves the symmetry of the BL curve, increases the amplitude of the diaphragm 4 when vibrating upward and reduces the amplitude of the diaphragm 4 when vibrating downward, so that the overall amplitude symmetry of the vibration system is better.

[0048] Combination Figure 6 and Figure 7 As shown, Figure 6 It is a schematic diagram comparing the test curves (SPL curves) of loudness at different frequencies of the sound-emitting device of this embodiment and the sound-emitting device in the prior art; Figure 7 Schematic diagram of the comparison of harmonic distortion test curves of the sound-generating device of this embodiment and the sound-generating device in the prior art. Figure 6 It can be seen that compared with the prior art, the sound pressure level of the sound-emitting device of this embodiment in the full frequency band is higher than that of the prior art, so this embodiment can improve the acoustic sensitivity of the sound-emitting device in the full frequency band and has a higher loudness. Figure 7It can be seen that the THD (total harmonic distortion) of the sound-emitting device of this embodiment is significantly lower than that of the prior art before 1 KHz, and the sound-emitting device of this embodiment has better sound quality.

[0049] Moreover, in the sound-generating device of the present invention, the skeleton structure 5 is an independent component, which is connected to the vibration part 41 and the folding ring part 42 through the inner fixing part 51 and the outer fixing part 52 respectively. Therefore, the material selection and structural design of the skeleton structure 5 are more flexible, and the installation position relationship with the vibration part 41 and the folding ring part 42 can also be freely combined according to the actual application situation, which is more feasible. In addition, the skeleton structure 5 adopts an independent structure surround, and there is a hollow hole in the middle. When assembling with the voice coil 6, it can be positioned through the hollow hole in the middle, thereby improving the assembly accuracy between the two.

[0050] Furthermore, the skeleton structure 5 in the present invention is connected to the vibration part 41 and the folding ring part 42 respectively through the inner fixing part 51 and the outer fixing part 52, which is conducive to reducing the thickness compared with the assembly method in which the outer edge of the vibration part 41, the inner edge of the folding ring part 42 and the skeleton structure 5 are sequentially stacked up and down. In addition, in the structure of the present invention, there is a gap between the vibration part 41 and the folding ring part 42, which is more conducive to the heat dissipation generated by the voice coil 6, especially when the skeleton structure 5 is made of metal.

[0051] like Figure 2 and Figure 3 As shown, in this specific embodiment, the outer edge of the vibration part 41 and the inner edge of the folding ring part 42 are both located on the upper side of the skeleton structure 5, the outer edge of the vibration part 41 is connected to the upper surface of the inner fixing part 51, and the inner edge of the folding ring part 42 is connected to the upper surface of the outer fixing part 52, and they are specifically fixed by adhesive. In this installation position relationship, since the skeleton structure 5 is located below the vibration part 41 and the folding ring part 42, the inner fixing part 51 and the outer fixing part 52 of the skeleton structure 5 are closer to the magnetic circuit system. Compared with other installation relationships, the voice coil 6 can be sent to the predetermined position of the magnetic gap when the height of the extension part 53 is made smaller.

[0052] In other embodiments, according to the needs of structural design, a structural design can also be adopted in which the outer edge of the vibration part 41 and the inner edge of the folding ring part 42 are both located on the lower side of the skeleton structure 5, the outer edge of the vibration part 41 is connected to the lower surface of the inner fixing part 51, and the inner edge of the folding ring part 42 is connected to the lower surface of the outer fixing part 52. In this design, the extension part 53 passes through the gap between the vibration part 41 and the folding ring part 42 and continues to extend downward. Alternatively, another structural design is adopted in which one of the outer edge of the vibration part 41 and the inner edge of the folding ring part 42 is located on the upper side of the skeleton structure 5, and the other is located on the lower side of the skeleton structure 5. In summary, the installation position relationship between the skeleton structure 5 and the vibration part 41 and the folding ring part 42 can be freely combined according to the actual application situation, with high flexibility.

[0053] Combination Figure 3 As shown, in this specific embodiment, the width of the extension portion 53 gradually decreases from top to bottom, forming a structure approximately in a trapezoidal shape. The support strength of the extension portion 53 is better, the support for the voice coil 6 is more stable, and the vibration system is not prone to polarization. Of course, in other embodiments, the extension portion 53 can also be a structure with the same width from top to bottom, which is simpler to manufacture, especially when the extension portion 53 is relatively small. Of course, the shape of the extension portion 53 is not limited to the above two designs.

[0054] In the selection of materials for the diaphragm 4, the vibration part 41 is usually made of a material with high rigidity, hard texture and relatively low density, which has a greater impact on the high-frequency performance of the sound-generating device. The material selection is, for example, aluminum, aluminum alloy, carbon fiber, or a composite structure of the above materials and foaming materials, etc. The use of composite structures is more common in the prior art. The folding ring part 42 is usually made of a material with high compliance, soft texture and high elasticity, which has a greater impact on the mid- and low-frequency performance of the sound-generating device. The material selection is, for example, a single layer or composite structure including PEEK, TPU, TPEE, silicone, rubber, etc.

[0055] The skeleton structure 5 also needs to be made of a material with a certain rigidity and light weight, which can reliably connect the vibration part 41 and the folding ring part 42 while not having a significant impact on the overall quality of the vibration system.

[0056] Compared with the structure in which the skeleton structure 5 is integrally formed with the vibration part 41 or with the folding ring part 42, the integrally formed structure may not be suitable for forming the skeleton structure 5 due to the materials used for the vibration part 41 and the folding ring part 42. First, it may be difficult to process and form. Second, even if it can be processed, it is difficult to ensure the overall performance requirements of the skeleton structure 5. Therefore, the integral forming method is less feasible. In this embodiment, the skeleton structure 5 is an independent component, and the material selection and structural design of the skeleton structure 5 are more flexible, easy to implement and can ensure performance reliability.

[0057] In addition, the skeleton structure 5 in this embodiment adopts an independent structure surround with a hollow hole in the middle. Compared with the one-piece molding structure described above, it is inconvenient to position the voice coil 6 and the skeleton structure 5 when assembling them, and the assembly accuracy is not high. When assembling the skeleton structure 5 with the voice coil 6, the skeleton structure 5 of this embodiment can be positioned through the hollow hole in the middle to improve the assembly accuracy between the two.

[0058] Preferably, the skeleton structure 5 is made of metal material. Specifically, one of aluminum, aluminum-magnesium alloy, aluminum-lithium alloy, titanium alloy, or other known metal materials that can be realized can be selected. The use of metal materials can ensure rigidity and strength in a thinner thickness. Specifically, the thickness of the skeleton structure 5 is less than or equal to 0.3 mm, or can be made thinner, for example, less than or equal to 0.1 mm.

[0059] When metal materials are used, a simple and quick forming method is that the extension portion 53 is formed by stamping and bending the middle section of the plate material for making the skeleton structure 5 .

[0060] By using the skeleton structure 5 made of metal material, the heat generated by the voice coil 6 can be quickly conducted to the metal skeleton structure 5 and then dissipated to the outside through the gap between the vibration part 41 and the folding ring part 42, which is more conducive to the heat dissipation generated by the voice coil 6.

[0061] In other embodiments, the material of the skeleton structure 5 may also be a rigid plastic material or a carbon fiber material; wherein the rigid plastic material may be selected from one of PET, PEI, PEN, PI, etc. When the rigid plastic material is a thermoplastic plastic, the extension portion 53 may also be formed by heating, stamping and bending the middle section of the plate material for making the skeleton structure 5.

[0062] In addition to being formed by stamping and bending, the extension portion 53 can also be formed by locally thickening the middle section of the plate material used to make the skeleton structure 5. For example, the two ends of the plate material are thinned to form the extension portion 53 in the thicker middle portion; or, a ring-shaped plate is pasted on the middle section of the plate material to form the extension portion 53; furthermore, the skeleton structure 5 can also be formed by integral injection molding, and the middle portion of the molded plate is thicker to form the extension portion 53, and so on.

[0063] Furthermore, in this specific embodiment, the raised structure of the folding ring portion 42 is arranged downward, which can reduce the height of the sound-generating device and is conducive to a thin design. On the basis of the above structure, because the folding ring portion 42 is raised downward, it is not convenient to set a centering structure above the voice coil 6, so in this embodiment, a centering structure for elastically supporting the voice coil 6 is arranged at the bottom of the voice coil 6. Moreover, in this specific embodiment, the centering structure is arranged at the four corners of the voice coil 6 and in the gap formed between the side magnets 31. In this specific embodiment, the centering structure is a centering support plate 7 made of FPCB material with a cantilever.

[0064] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, comprising a vibration system and a magnetic circuit system, wherein the vibration system comprises a diaphragm and a voice coil coupled to the diaphragm, the magnetic circuit system forms a magnetic gap, and the voice coil extends into the magnetic gap, characterized in that: The diaphragm comprises a vibration part located in the center and a folding ring part with a convex structure arranged around the vibration part, and there is a gap between the vibration part and the folding ring part; The vibration system also includes a rigid skeleton structure fixedly connected to the diaphragm and arranged around it, the skeleton structure including an inner fixing portion, an outer fixing portion, and an extension portion connected between the inner fixing portion and the outer fixing portion and protruding toward the magnetic gap direction; The inner fixing portion is connected to the outer edge of the vibrating portion, and the outer fixing portion is connected to the inner edge of the folding ring portion; The upper end of the voice coil is connected to the lower end of the extension portion.

2. A sound-generating device as claimed in claim 1, characterized in that: The outer edge of the vibration part and the inner edge of the folding ring part are both located on the upper side of the skeleton structure, the outer edge of the vibration part is connected to the upper surface of the inner fixing part, and the inner edge of the folding ring part is connected to the upper surface of the outer fixing part.

3. A sound-generating device as claimed in claim 1, characterized in that: The outer edge of the vibration part and the inner edge of the folding ring part are both located at the lower side of the skeleton structure, the outer edge of the vibration part is connected to the lower surface of the inner fixing part, and the inner edge of the folding ring part is connected to the lower surface of the outer fixing part; Alternatively, one of the outer edge of the vibration part and the inner edge of the folding ring part is located on the upper side of the skeleton structure, and the other is located on the lower side of the skeleton structure.

4. A sound-generating device as claimed in claim 1, characterized in that: The width of the extension portion gradually decreases from top to bottom; Alternatively, the width of the extension portion is consistent from top to bottom.

5. A sound-generating device as claimed in claim 1, characterized in that: The skeleton structure is made of metal material.

6. A sound-generating device as claimed in claim 5, characterized in that: The metal material is one of aluminum, aluminum-magnesium alloy, aluminum-lithium alloy and titanium alloy.

7. A sound-generating device as claimed in claim 1, characterized in that: The material of the skeleton structure is a rigid plastic material or a carbon fiber material; Wherein, the rigid plastic material is one of PET, PEI, PEN and PI.

8. A sound-generating device as claimed in claim 5, characterized in that: The extension portion is formed by stamping and bending the middle section of the plate material for making the skeleton structure.

9. A sound-generating device as claimed in claim 8, characterized in that: The thickness of the skeleton structure is less than or equal to 0.3 mm.

10. A sound-generating device as claimed in claim 1, characterized in that: The extension portion is formed by locally thickening the middle section of the plate material for making the skeleton structure.

11. A sound-generating device as claimed in claim 1, characterized in that: The raised structure of the folding ring portion is arranged downward; A centering structure for elastically supporting the voice coil is arranged at the bottom of the voice coil, and the centering structure is distributed at the four corners of the voice coil.

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