Sound production device and sound production module

Abstract

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, and the shell is provided with an accommodating space; the magnetic circuit system is arranged in the accommodating space, the magnetic circuit system comprises a magnet yoke, an inner magnetic part and an edge magnetic part, the inner magnetic part and the edge magnetic part are arranged on the magnet yoke, the edge magnetic part is located on the outer side of the inner magnetic part, a magnetic gap is formed between the inner magnetic part and the edge magnetic part, and the edge magnetic part is provided with a notch; the vibration system comprises a voice coil, at least part of the voice coil is arranged in the magnetic gap, the voice coil is provided with a first protruding part formed by extending into the notch of the side magnetic part, the inner magnetic part is provided with a second protruding part, and the second protruding part and the first protruding part are correspondingly arranged.

Description

Technical Field

[0001] This application relates to the field of electronic product technology, and more specifically, to a sound-generating device and a sound-generating module. Background Technology

[0002] With the rapid development of the consumer electronics industry, consumers' demands for electronic products are constantly increasing; in addition to the performance of the product itself, portability and comfort have become key aspects that consumers focus on. Currently, conventional speakers struggle to simultaneously meet multiple design requirements such as high performance and slim design.

[0003] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] One objective of this application is to provide a new technical solution for a sound-generating device and a sound-generating module.

[0005] According to a first aspect of this application, a sound-generating device is provided, the sound-generating device comprising:

[0006] An outer casing having a receiving space;

[0007] A magnetic circuit system is disposed in the accommodating space. The magnetic circuit system includes a magnetic yoke and an inner magnetic part and a side magnetic part disposed on the magnetic yoke. The side magnetic part is located outside the inner magnetic part. A magnetic gap is formed between the inner magnetic part and the side magnetic part. The side magnetic part is provided with a notch.

[0008] A vibration system, the vibration system including a voice coil, the voice coil being at least partially disposed in the magnetic gap, the voice coil having a first protrusion extending into a notch in the outer magnetic portion, the inner magnetic portion having a second protrusion, the second protrusion being disposed corresponding to the first protrusion.

[0009] Optionally, the voice coil is rectangular, and the first protrusion is located at the four corners of the voice coil.

[0010] Optionally, the first protrusion has two opposing first sides, and the second protrusion has two opposing second sides, with the first sides and the second sides arranged in parallel.

[0011] Optionally, the notch of the edge magnetic part has two opposing third sides, which are arranged parallel to the first side.

[0012] Optionally, the inner magnetic part includes an inner magnet and an inner magnetic plate that match each other in shape and size. The inner magnet is sandwiched between the inner magnetic plate and the magnetic yoke. The second protrusion includes a first sub-protrusion and a second sub-protrusion. The first sub-protrusion extends from the inner magnet and the second sub-protrusion extends from the inner magnetic plate. The first protrusion, the first sub-protrusion, and the second sub-protrusion are all correspondingly arranged. The first protrusion includes a first side and a connecting side. The number of first sides is two. The two first sides are arranged opposite each other. The connecting side connects the two first sides. The first sub-protrusion has two oppositely arranged first sub-sides. The second sub-protrusion has two oppositely arranged second sub-sides. The first sub-side and the second sub-side form the second side. The first side, the first sub-side, and the second sub-side are arranged in parallel.

[0013] Optionally, the side magnetic part includes a side magnet and a side magnetic guide plate that are matched in shape and size. The side magnet is sandwiched between the side magnetic guide plate and the magnetic yoke. Both the side magnet and the side magnetic guide plate are provided with the notch. The side magnet has two oppositely arranged third sub-sides at its notch, and the side magnetic guide plate has two oppositely arranged fourth sub-sides at its notch. The third sub-sides and the fourth sub-sides form the third side. The third sub-sides, the fourth sub-sides and the first side are arranged in parallel.

[0014] Optionally, the vibration system further includes a first diaphragm, a second diaphragm, and an intermediate septum. The first diaphragm is disposed on the side of the housing away from the magnetic circuit system, the second diaphragm is disposed on the side of the first diaphragm facing the magnetic circuit system, and the intermediate septum is disposed between the first diaphragm and the second diaphragm. The intermediate septum is a flexible component. The voice coil is connected to the first diaphragm, and the second diaphragm and the intermediate septum are located outside the voice coil. The outer edges of the second diaphragm and the intermediate septum are both connected to the housing, and the inner edges of the second diaphragm and the intermediate septum are both connected to the first diaphragm. A sealed second sound cavity is formed between the second diaphragm and the intermediate septum. The housing has a first sound outlet, and the second sound cavity communicates with the first sound outlet.

[0015] Optionally, the first diaphragm includes a first folded ring and a first vibrating plate, the outer edge of the first folded ring is connected to the outer shell, and the inner edge of the first folded ring is connected to the first vibrating plate; the second diaphragm includes a second folded ring and a second vibrating plate, the outer side of the second folded ring is connected to the outer shell, the inner side of the second folded ring is connected to the outer side of the second vibrating plate, and the inner side of the second vibrating plate is integrally bent and extended to the first vibrating plate and connected to the first vibrating plate.

[0016] Optionally, the intermediate diaphragm is a flexible component, comprising an outer connecting portion, a deformable portion, and an inner connecting portion. The deformable portion is located between the outer connecting portion and the inner connecting portion. The outer connecting portion is connected to the outer shell, and the inner connecting portion is located between the inner edges of the first vibrating plate and the second vibrating plate. The effective vibration area of ​​the intermediate diaphragm is smaller than the effective vibration area of ​​the second diaphragm, and the ratio of the effective vibration area of ​​the intermediate diaphragm to the effective vibration area of ​​the second diaphragm is 1:1.5 to 1:3.

[0017] Optionally, the sound-generating device further includes an elastic support member disposed on the side of the second diaphragm away from the first diaphragm. The elastic support member includes an outer fixing part, a vibrating arm, and an inner fixing part connected in sequence. The outer fixing part is fixed to the outer shell, the inner fixing part is fixed to the second vibrating plate, and the inner fixing part is provided with a solder pad electrically connected to the voice coil.

[0018] Optionally, the inner fixing part includes a body part and an extension part extending from the body part toward the voice coil and connected to the voice coil. The body part is fixed to the second diaphragm, the extension part is connected to the first protrusion, and the extension part or the body part is provided with a solder pad electrically connected to the voice coil.

[0019] According to a second aspect of this application, a sound-generating module is provided, the sound-generating module including the sound-generating device as described in the first aspect; and further including a module housing, wherein a first sound-generating cavity is formed between the module housing and the first diaphragm, the module housing having a sound outlet, and the first sound cavity communicating with the sound outlet.

[0020] In the sound-generating device provided in this application embodiment, since the voice coil has an irregular shape and the inner magnetic part is provided with a second protrusion, the second protrusion is provided in correspondence with the first protrusion. By using the shape of the inner magnetic part to match the voice coil, the voice coil can effectively utilize the gap at the notch structure of the side magnetic part. When the voice coil size is small, the length of the voice coil wire can be effectively increased, the BL value can be improved, thereby improving the overall performance of the sound-generating device.

[0021] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0023] Figure 1a The diagram shown is an exploded view of a sound-generating device according to an embodiment of this application.

[0024] Figure 1b The diagram shown is a cross-sectional view of a sound-generating device according to an embodiment of this application.

[0025] Figure 1c The diagram shown is a cross-sectional view of a sound-generating device according to an embodiment of this application. Figure 2 ;

[0026] Figure 1d The diagram shown is a cross-sectional view of a sound-generating device according to an embodiment of this application. Figure 3 ;

[0027] Figure 1e The diagram shown is a structural schematic of the voice coil in a sound-generating device according to an embodiment of this application;

[0028] Figure 1f The diagram shown is a structural schematic of an elastic support member in a sound-generating device according to an embodiment of this application.

[0029] Figure 1g The diagram shown is a partial structural schematic of a sound-generating device according to an embodiment of this application;

[0030] Figure 1h The diagram shown is a partial exploded view of a sound-generating device according to an embodiment of this application.

[0031] Figure 1i The diagram shown is a schematic diagram of the overall structure of a sound-generating device according to an embodiment of this application;

[0032] Figure 1j The diagram shown is a schematic representation of the overall structure of a sound-generating device according to an embodiment of this application. Figure 2 ;

[0033] Figure 2 The diagram shown is a structural schematic of a sound-generating module according to an embodiment of this application;

[0034] Figure 3 The diagram shown is a structural schematic of an electronic device according to an embodiment of this application;

[0035] Figure 4 The diagram shown is a structural schematic of an electronic device according to an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Sound-generating device; 10. Housing; 101. First housing; 1011. First sidewall; 1012. Inner bent wall; 102. Second housing; 100. First sound outlet; 11. First diaphragm; 111. First surround; 110. First flange; 112. First diaphragm; 1121. First protrusion; 1122. Second protrusion; 113. First support; 114. Second support; 12. Second diaphragm; 121. Second surround; 120. Second flange; 122. Second diaphragm; 1220. Inclined portion; 13. Intermediate septum; 131. Outer connecting portion; 132. Deformation portion; 133. Inner connecting portion; 14. Voice coil; 140. First protrusion; 141. First side; 142. Connecting... 15. Elastic support; 151. External fixing part; 152. Internal fixing part; 1521. Body part; 1522. Extension part; 153. Vibrating arm; 150. Conductive part; 16. Internal magnetic part; 161. Internal magnet; 1610. First sub-protrusion; 1611. First sub-side; 162. Internal magnetic plate; 1620. Second sub-protrusion; 1621. Second sub-side; 17. Side magnetic part; 171. Side magnet; 1710. Third sub-side; 1711. First side magnet; 1712. Second side magnet; 172. Side magnetic plate; 1720. Fourth sub-side; 1721. First side magnetic plate; 1722. Second side magnetic plate; 18. Magnetic yoke; 180. Avoidance structure; 19. Welding protrusion;

[0038] 2. Module housing; 20. Sound outlet; 21. Rear sound outlet channel; 22. Rear sound cavity; 3. Electronic device housing; 30. Electronic device cavity; 31. Electronic device sound outlet hole. Detailed Implementation

[0039] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0040] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0041] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0042] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0044] Reference Figures 1a-2 As shown, according to one embodiment of this application, a sound generating device 1 is provided. The sound generating device 1 includes a housing 10, a magnetic circuit system, and a vibration system. The housing 10 has an accommodating space. The magnetic circuit system is disposed in the accommodating space. The magnetic circuit system includes a magnetic yoke 18 and an inner magnetic part 16 and a side magnetic part 17 disposed on the magnetic yoke 18. The side magnetic part 17 is located outside the inner magnetic part 16. A magnetic gap is formed between the inner magnetic part 16 and the side magnetic part 17. The side magnetic part 17 is provided with a notch.

[0045] The vibration system includes a voice coil 14, which is at least partially disposed in the magnetic gap, and has a first protrusion 140 extending into the notch of the side magnetic portion 17.

[0046] In the sound-generating device 1 provided in this application embodiment, since the voice coil 14 has the above-mentioned irregular shape design, the voice coil 14 can effectively utilize the gap at the notch structure of the side magnet 17. When the voice coil size is small, the length of the voice coil wire can be effectively increased, the BL value can be improved, thereby improving the overall performance of the sound-generating device 1.

[0047] Reference Figure 1h As shown, in one embodiment, the inner magnetic part 16 has a second protrusion, which is disposed corresponding to the first protrusion 140.

[0048] In this specific example, the inner magnetic part 16 is provided with a second protrusion, which is provided in correspondence with the first protrusion 140. By utilizing the shape of the inner magnetic part 16 to match the voice coil 14, the voice coil 14 can effectively utilize the magnetic field gap at the corner of the magnetic circuit system, thereby increasing the BL of the sound-generating device 1 and thus improving its overall acoustic performance.

[0049] Reference Figure 1h As shown, in one embodiment, the first protrusion 140 has two opposing first sides 141, and the second protrusion has two opposing second sides, with the first sides 141 and the second sides arranged in parallel.

[0050] Specifically, the inner magnetic part 16 includes an inner magnet 161 and an inner magnetic plate 162 whose shapes and sizes are matched. The inner magnet 161 is sandwiched between the inner magnetic plate 162 and the magnetic yoke 18. The second protrusion includes both a protrusion formed by extending from the inner magnet 161 and a protrusion formed by extending from the inner magnetic plate 162. In addition, four first protrusions 140 are provided. Each first protrusion 140 includes a first side 141 arranged opposite to each other, and a second protrusion forms a second side opposite to the first side 141. The first side 141 and the second side are arranged parallel to each other. Specifically, the inner magnet 161 extends to form a first sub-protrusion 1610, and the inner magnetic plate 162 extends to form a second sub-protrusion 1620. The first protrusions 140, the first sub-protrusions 1610, and the second sub-protrusions 1620 are all correspondingly provided.

[0051] In this specific example, the inner magnetic part 16 includes an inner magnet 161 and an inner magnetic plate 162. The shape of the inner magnet 161 and the shape of the inner magnetic plate 162 are matched with the voice coil 14, which further ensures the compatibility of the voice coil 14 with the magnetic circuit system and improves the utilization rate of the voice coil 14 to the magnetic field gap formed in the magnetic circuit system.

[0052] Reference Figure 1e As shown, in one embodiment, the voice coil 14 is generally rectangular, with first protrusions 140 located at the four corners of the voice coil 14. The four first protrusions 140 are respectively located at the four corners of the rectangle. This reduces stress concentration in the voice coil 14, improving its service life.

[0053] More specifically, the shapes of the inner magnet 161 and the inner magnetic plate 162 are matched with the voice coil 14, that is, both the inner magnet 161 and the inner magnetic plate 162 are approximately rectangular, and the protrusions formed by the extension of the inner magnet 161 are located at the four corners, and the protrusions formed by the extension of the inner magnetic plate 162 are also located at the four corners. That is, the first sub-protrusion 1610 is located at the four corners, and the second sub-protrusion 1620 is also located at the four corners.

[0054] Reference Figure 1e and Figure 1h As shown, the first protrusion 140 includes a first side 141 and a connecting side 142. Two first sides 141 are provided, arranged opposite to each other, and the connecting side 142 connects the two first sides 141. Optionally, the connecting side 142 is an arc-shaped side. Further optionally, the two first sides 141 have an arc-shaped transition with adjacent sides.

[0055] Reference Figure 1hAs shown, in one embodiment, the first sub-protrusion 1610 has two oppositely arranged first sub-sides 1611, and the second sub-protrusion 1620 has two oppositely arranged second sub-sides 1621. The first sub-sides 1611 and the second sub-sides 1621 together constitute the second side, and the first side 141, the first sub-sides 1611 and the second sub-sides 1621 are arranged in parallel.

[0056] In this specific example, the first sub-side 1611 of the first sub-protrusion 1610 and the second sub-side 1621 of the second sub-protrusion 1620 are both arranged parallel to the first side 141 of the voice coil 14. This helps to maintain the uniformity of the magnetic gap, thereby ensuring the stable movement of the voice coil 14 within the magnetic gap.

[0057] Reference Figure 1h As shown, in one embodiment, the notch of the side magnetic portion 17 has two opposing third sides, which are arranged parallel to the first side 141.

[0058] Specifically, the side magnetic section 17 includes a side magnet 171 and a side magnetic plate 172 whose shapes and sizes are matched. The side magnet 171 is sandwiched between the side magnetic plate 172 and the magnetic yoke 18. Both the side magnet 171 and the side magnetic plate 172 are provided with notches. In addition, the side magnetic section 17 includes two opposing third sides at the notches; wherein the third sides are parallel to the first side 141. In this way, the width of the magnetic gap can be ensured to be uniform, so that the voice coil 14 vibrates in a stable magnetic field.

[0059] Specifically, refer to Figure 1h As shown, the side magnet 171 has two oppositely arranged third sub-sides 1710 at its notch, and the side magnetic plate 172 has two oppositely arranged fourth sub-sides 1720 at its notch. The third sub-sides 1710 and the fourth sub-sides 1720 together constitute the third side, and the third sub-sides 1710, the fourth sub-sides 1720 and the first side 141 are arranged in parallel.

[0060] In this specific example, the side magnetic part 17 includes a side magnet 171 and a side magnetic guide plate 172. Furthermore, the third sub-side 1710 of the side magnet 171 and the fourth sub-side 1720 of the side magnetic guide plate 172 are both arranged parallel to the first side 141 of the voice coil 14. This helps to further ensure the uniformity of the magnetic gap width, so that the voice coil 14 vibrates in a stable magnetic field and improves the performance of the sound-generating device.

[0061] To be more specific, refer to Figure 1hAs shown, four side magnets 171 and four side magnetic plates 172 are provided. More specifically, the side magnets 171 include two first side magnets 1711 and two second side magnets 1712; the side magnetic plates 172 include two first side magnetic plates 1721 and two second side magnetic plates 1722. The two first side magnets 1711 and the two first side magnetic plates 1721 correspond to the long rectangular side of the voice coil 14 and are relatively long; the two second side magnets 1712 and the two second side magnetic plates 1722 correspond to the short rectangular side of the voice coil 14 and are relatively short.

[0062] In one embodiment, the sound-generating device further includes an elastic support 15, which comprises an outer fixing part 151, a vibrating arm 153, and an inner fixing part 152 connected in sequence. The outer fixing part 151 is fixed to the outer shell 10, and the inner fixing part 152 is fixed to the first protrusion 140. The inner fixing part 152 is provided with a solder pad that is soldered and connected to the voice coil 14. The elastic support 15 can introduce external current into the voice coil 14 and simultaneously constrain the voice coil 14 to vibrate along the vibration direction, reducing the risk of polarization and ensuring the vibration performance of the vibration system.

[0063] Reference Figures 1a to 1d As shown, in one embodiment, the vibration system further includes a first diaphragm 11, a second diaphragm 12, and an intermediate septum 13. The first diaphragm 11 is disposed on the side of the housing 10 away from the magnetic circuit system, the second diaphragm 12 is disposed on the side of the first diaphragm 11 facing the magnetic circuit system, and the intermediate septum 13 is disposed between the first diaphragm 11 and the second diaphragm 12. The intermediate septum 13 is a flexible component. The voice coil 14 is connected to the first diaphragm 11, and the second diaphragm 12 and the intermediate septum 13 are located outside the voice coil 14. The outer edges of the second diaphragm 12 and the intermediate septum 13 are both connected to the housing 10, and the inner edges of the second diaphragm 12 and the intermediate septum 13 are both connected to the first diaphragm 11. A sealed second sound cavity Q2 is formed between the second diaphragm 12 and the intermediate septum 13. The housing 10 has a first sound outlet 100, and the second sound cavity Q2 communicates with the first sound outlet 100.

[0064] In the sound-generating device 1 provided in this embodiment, the magnetic circuit system is responsible for providing a constant magnetic field, and the voice coil 14 is placed in the constant magnetic field. When the audio current passes through the voice coil 14, the voice coil 14 vibrates under the action of the Ampere force in the magnetic field, thereby driving the first diaphragm 11 to vibrate and generate sound. Furthermore, since the second diaphragm 12 and the intermediate septum 13 are both connected to the first diaphragm 11, the first diaphragm 11 vibrates while also driving the second diaphragm 12 and the intermediate septum 13 to vibrate together in the same direction. A sealed second sound-generating cavity Q2 is formed between the second diaphragm 12 and the intermediate septum 13. The vibration of the first diaphragm 11, the second diaphragm 12 and the intermediate septum 13 will drive the sound waves of the second sound-generating cavity Q2 to radiate outward through the first sound outlet 100, thereby realizing the vibration sound generation of the sound-generating device 1.

[0065] In the sound-generating device 1 provided in this embodiment, a second diaphragm 12 and an intermediate septum 13 are added to the traditional first diaphragm 11 vibration sound generation. The second diaphragm 12 and the intermediate septum 13 form a sealed second sound-generating cavity Q2. The sound waves from the second sound-generating cavity Q2 radiate outward through the first sound outlet 100, thereby increasing the effective vibration area of ​​the vibration system, and thus improving the FR frequency response of the sound-generating device 1 and enhancing its acoustic performance. That is, by increasing the effective vibration area of ​​the vibration system, the sound-generating device 1 provided in this embodiment improves the acoustic performance of the sound-generating device 1 under the same amplitude conditions without increasing the size of the sound-generating device. In other words, if the sound-generating device 1 provided in this embodiment maintains the same acoustic performance as a conventional sound-generating device, the amplitude of the vibration system can be reduced, thereby enabling a thinner and lighter design for the sound-generating device 1.

[0066] Reference Figure 1a , 1f As shown, in one embodiment, the sound-generating device further includes an elastic support 15, which is disposed on the side of the second diaphragm 12 away from the first diaphragm 11, and is connected to the voice coil 14. The elastic support 15 includes an outer fixing part 151, a vibrating arm 153, and an inner fixing part 152 connected in sequence. The outer fixing part 151 is fixed to the outer shell 10, and the inner fixing part 152 is fixed to the second diaphragm 12. The inner fixing part 152 is provided with a solder pad electrically connected to the voice coil 14. Further, the second diaphragm 12 includes a second folded ring 121 and a second diaphragm plate 122. The outer side of the second folded ring 121 is connected to the outer shell 10, and the inner side of the second folded ring 121 is connected to the outer side of the second diaphragm plate 122. The inner fixing part 152 is fixed to the second diaphragm plate 122.

[0067] In this specific example, the elastic support 15 not only provides an electrical connection path between the voice coil 14 and the external circuit system, but also helps to improve the vibration stability of the vibration system and reduce polarization. The first protrusion 140 on the voice coil 14 can reduce the distance between the voice coil 14 and the second diaphragm 12, facilitating the connection and assembly of the elastic support 15 and the second diaphragm 12.

[0068] Reference Figure 1f As shown, in one embodiment, the inner fixing portion 152 includes a body portion 1521 and an extension portion 1522. The extension portion 1522 extends from the body portion 1521 toward the voice coil 14 and is connected to the voice coil 14. The body portion 1521 is connected to the second diaphragm 122, and the body portion 1521 or the extension portion 1522 is provided with pads electrically connected to the voice coil 14. Specifically, the extension portion 1522 is connected to the first protrusion 140.

[0069] In this specific example, the inner fixing part 152 includes a body part 1521 and an extension part 1522. This structural design helps to simplify the process of connecting and assembling the elastic support 15 and the voice coil 14, and ensures a reliable connection between the inner fixing part 152 and the first protrusion 140.

[0070] Furthermore, referring to Figure 1f As shown, the sound-generating device 1 is rectangular, with four inner fixing parts 152, each corresponding to one of the four corners of the voice coil 14. All four inner fixing parts 152 are located inside the outer fixing part 151. A gap is provided between the vibrating arm 153 and the outer fixing part 151 to ensure that the vibrating arm 153 can vibrate freely under the action of the voice coil 14. Furthermore, a conductive part 150 for providing electrical connection between the voice coil 14 and an external circuit system is connected to the outer side of the outer fixing part 151. It can be seen that the sound-generating device 1 includes two opposing long axes and a short axis connecting the two long axes. The vibrating arm 153 extends from the short axis and along the long axis. This helps to increase the length of the vibrating arm of the elastic support 15, ensuring its reliability when the sound-generating device operates at large amplitude.

[0071] Optionally, the elastic support 15 can be a single integral structure; or, the elastic support 15 can include two or four separate discrete structures.

[0072] In one embodiment, the magnetic circuit system includes a yoke 18, an inner magnetic portion 16, and a side magnetic portion 17. The inner magnetic portion 16 and the side magnetic portion 17 are mounted on the yoke 18. The yoke 18 is provided with a clearance structure 180 for avoiding the inner fixing portion 152 of the elastic support member 15. The clearance structure 180 can be a recessed groove or a through hole. When the clearance structure 180 is a through hole, it also serves as a leakage hole for the sound-generating device 1, connecting the internal space and the external space of the sound-generating device. The clearance structure 180 helps to prevent the yoke 18 from interfering with the vibration of the inner fixing portion 152 following the voice coil 14.

[0073] Reference Figure 1a , Figure 1b As shown, in one embodiment, the first diaphragm 11 includes a first folded ring 111 and a first vibrating plate 112. The outer edge of the first folded ring 111 is connected to the outer shell 10, and the inner edge of the first folded ring 111 is connected to the first vibrating plate 112. The second diaphragm 12 includes a second folded ring 121 and a second vibrating plate 122. The outer side of the second folded ring 121 is connected to the outer shell 10, and the inner side of the second folded ring 121 is connected to the outer side of the second vibrating plate 122. The inner side of the second vibrating plate 122 is integrally bent and extends to the first vibrating plate 112 and is connected to the first vibrating plate 112. Optionally, the inner side of the second vibrating plate 122 includes an inclined portion 1220 arranged at a predetermined angle to the vibration direction.

[0074] In this specific example, the first diaphragm 11 includes a first folded ring 111 made of flexible material and a first vibrating plate 112 made of rigid material, which are connected to each other. The second diaphragm 12 includes a second folded ring 121 made of flexible material and a second vibrating plate 122 made of rigid material, which are connected to each other. The second vibrating plate 122 also serves as a skeleton connecting the first diaphragm 11 and the intermediate septum 13, facilitating the integration of components of the sound-generating device 1 and saving internal volume. In addition, the inner side of the second vibrating plate 122 includes an inclined portion 1220. The inclined portion 1220 can improve the rigidity of the second vibrating plate 122 in the horizontal direction (i.e., perpendicular to the vibration direction of the vibration system), thereby improving the vibration performance of the second diaphragm 12 and increasing the feasibility of molding. Meanwhile, the inclined portion 1220 is further away from the magnetic circuit system relative to the inner edge of the second vibrating plate 122, which allows the outer edge of the magnetic circuit system to tilt and expand outward, thereby increasing the size of the magnetic circuit system and further improving the BL of the sound-generating device; and the inclined portion 1220 facilitates the positioning and connection of the second vibrating plate 122 and the second folding ring 121, improving the connection accuracy. In this embodiment, the second vibrating plate 122 can be a magnesium-aluminum alloy, a magnesium-lithium alloy, etc.

[0075] Reference Figure 1a As shown, in one embodiment, the intermediate diaphragm 13 is a flexible component. The intermediate diaphragm 13 includes an outer connecting portion 131, a deformable portion 132, and an inner connecting portion 133. The deformable portion 132 is located between the outer connecting portion 131 and the inner connecting portion 133. The outer connecting portion 131 is connected to the outer shell 10, and the inner connecting portion 133 is located between the inner edges of the first vibrating plate 112 and the second vibrating plate 122. The effective vibration area of ​​the intermediate diaphragm 13 is smaller than the effective vibration area of ​​the second diaphragm 12. Optionally, the intermediate diaphragm is a single-layer PEEK (polyether ether ketone) membrane, a composite PEEK (polyether ether ketone) membrane, etc.

[0076] In this specific example, when the sound-generating device 1 is working, the intermediate diaphragm 13 has a reaction effect on pushing the air volume, while the second diaphragm 12 has a positive effect on pushing the air volume. Since the effective vibration area of ​​the intermediate diaphragm 13 is smaller than that of the second diaphragm 12, the positive phase sound wave of the second sound cavity Q2 can be increased, thereby increasing the volume of air pushed by the sound-generating device 1 and improving the sound quality. It should be noted that the intermediate diaphragm 13 is a flexible component, and the second diaphragm 12 includes a second folded ring 121 and a second vibrating plate 122. Furthermore, the ratio of the effective vibration area of ​​the intermediate diaphragm 13 to the effective vibration area of ​​the second diaphragm 12 is 1:1.5 to 1:3.

[0077] In this embodiment, the inner connecting portion 133 is positioned closer to the first diaphragm 11 than the outer connecting portion 131, thereby increasing the volume of the second sound-generating cavity Q2 and improving the acoustic performance of the sound-generating device 1. Alternatively, the inner connecting portion 133 may be located between the inner edges of the first diaphragm 11 and the second vibrating plate 122; or, the inner edge of the second vibrating plate 122 may be located between the first diaphragm 11 and the inner connecting portion 133; this improves the connection stability of the three components. Alternatively, the inner connecting portion 133 and the inner edges of the second vibrating plate 122 may be connected to the first diaphragm 11 respectively, meaning that the inner connecting portion 133 and the inner edges of the second vibrating plate 122 may not be connected, and both may be connected to the first diaphragm 11. Various connection methods can be flexibly selected according to actual applications, and this invention does not impose any limitations.

[0078] Reference Figures 1b-1d As shown, in one embodiment, the first diaphragm 11 includes a first folded ring 111 and a first vibrating plate 112. The outer edge of the first folded ring 111 is connected to the outer shell 10, and the inner edge of the first folded ring 111 is connected to the first vibrating plate 112. Optionally, the first vibrating plate 112 is provided with a first protrusion 1121, which is connected to the second vibrating plate 122 and the intermediate septum 13; or, the first diaphragm 11 further includes a first support 113, one end of which is connected to the first vibrating plate 112, and the other end of which is connected to the second vibrating plate 122 and the intermediate septum 13.

[0079] In this specific example, the first diaphragm 11 can have two structural forms: In the first structural form, the first diaphragm 11 includes a first folded ring 111 and a first vibrating plate 112. The first vibrating plate 112 has a first protrusion 1121 integrally formed thereon. The first diaphragm 11 is connected to the second diaphragm 12 and the intermediate septum 13 through the first protrusion 1121. In this way, using the first protrusion 1121 as a connecting frame can save on the number of parts, reduce the assembly process of the sound-generating device 1, and save on manufacturing costs. In the second structural form, the first diaphragm 11 also includes a first support 113. The first vibrating plate 112 is connected to the second diaphragm 12 and the intermediate septum 13 through the first support 113. In this way, the connection position between the second diaphragm 12 and the intermediate septum 13 and the first diaphragm 11 can be flexibly adjusted by adjusting the height of the first support 113. Both of these structural forms of the first diaphragm 11 can ensure effective connection between the first diaphragm 11, the second diaphragm 12, and the intermediate septum 13, thereby ensuring the integrity of the vibration system of the sound-generating device 1.

[0080] Reference Figures 1b-1dAs shown, in one embodiment, the first diaphragm 11 includes a first folded ring 111 and a first diaphragm plate 112. The outer edge of the first folded ring 111 is connected to the outer casing 10, and the inner edge of the first folded ring 111 is connected to the first diaphragm plate 112. Optionally, the first diaphragm plate 112 is provided with a second protrusion 1122, which is connected to the voice coil 14; or, the first diaphragm 11 further includes a second support 114, one end of which is connected to the first diaphragm plate 112, and the other end of which is connected to the voice coil 14.

[0081] In this specific example, the first diaphragm 11 can be connected to the voice coil 14 through two structural forms: In the first structural form, the first diaphragm 11 includes a first surround 111 and a first diaphragm plate 112. The first diaphragm plate 112 has a second protrusion 1122 integrally formed thereon, and the first diaphragm 11 is connected to the voice coil 14 through the second protrusion 1122. Thus, using the second protrusion 1122 as a connecting frame can save on the number of components, reduce the assembly steps of the sound-generating device 1, and save on manufacturing costs. In the second structural form, the first diaphragm 11 also includes a second support 114, and the first diaphragm plate 112 is connected to the voice coil 14 through the second support 114. Thus, the position of the voice coil 14 in the magnetic gap can be flexibly adjusted by adjusting the height of the second support 114. Both structural forms of the first diaphragm 11 can ensure an effective connection between the first diaphragm 11 and the voice coil 14, thereby ensuring that the voice coil 14 can effectively drive the first diaphragm 11 to vibrate and produce sound.

[0082] In summary, the first diaphragm 112 can be integrally formed with a first protrusion 1121 connected to the second diaphragm 12, or the first diaphragm 112 can be integrally formed with a second protrusion 1122 connected to the voice coil 14; or the first diaphragm 112 can also be connected to the second diaphragm 12 via a first bracket 113 or to the voice coil 14 via a second bracket 114.

[0083] In one embodiment, the intermediate septum 13 is a flexible member, and the second diaphragm 12 includes a second folded ring 121 and a second vibrating plate 122. In the projection along the vibration direction, the width of the deformed portion of the intermediate septum 13 is greater than or equal to the width of the deformed portion of the second folded ring 121, and the ratio of the width of the deformed portion of the intermediate septum 13 to the width of the deformed portion of the second folded ring 121 is 1:1 to 3:1.

[0084] In this specific example, the width of the deformed portion of the intermediate septum 13 is greater than or equal to the width of the deformed portion of the second fold 121, which helps to improve the compliance of the intermediate septum 13.

[0085] In one embodiment, the first diaphragm 11 includes a first folded ring 111 and a first vibrating plate 112. The outer edge of the first folded ring 111 is connected to the outer shell 10, and the inner edge of the first folded ring 111 is connected to the first vibrating plate 112. The compliance of the intermediate septum 13 is greater than that of the second folded ring 121 and the first folded ring 111. That is, the compliance of the second folded ring and the first folded ring is less than that of the intermediate septum.

[0086] In this embodiment, the intermediate diaphragm 13 has a large compliance and only serves to form a closed second sound cavity Q2 with the second diaphragm 12. It will not affect the vibration performance of the first diaphragm 11 and the second diaphragm 12, thereby improving the low-frequency sensitivity of the sound generating device 1.

[0087] Reference Figure 1a , Figure 2 As shown, in one embodiment, the first diaphragm 11 and the intermediate septum 13 form a first rear cavity H1, and the first diaphragm 11, the second diaphragm 12, and the outer shell 10 form a second rear cavity H2; the first rear cavity H1 and the second rear cavity H2 are connected. This facilitates the flow of air inside the sound-generating device 1, improves the air pressure balance at different locations within the internal region of the sound-generating device 1, and enhances the vibration performance of the first diaphragm 11 and the second diaphragm 12. It should be noted that when the first diaphragm 11 is connected to the second diaphragm 12 and the intermediate septum 13 via the first protrusion 1121 of the first vibrating plate 112, the first protrusion 1121 is provided with a notch for connecting the first rear cavity H1 and the second rear cavity H2, that is, the first protrusions 1121 are spaced apart on the first vibrating plate. Alternatively, when the first diaphragm 11 is connected to the second diaphragm 12 and the intermediate septum 13 via the first bracket 113, the first bracket 113 is provided with a notch for connecting the first rear cavity H1 and the second rear cavity H2.

[0088] Furthermore, the first diaphragm 11, the second diaphragm 12, the outer shell 10, and the magnetic circuit system together form a second rear cavity H2. For example... Figures 1b-1d and Figure 2 As shown, the outer shell 10 is an annular structure with openings at both ends. The magnetic circuit system is connected to one end and covers the opening. The first diaphragm 11, the second diaphragm 12, the outer shell 10 and the magnetic circuit system form a second rear cavity H2.

[0089] Reference Figure 1b As shown, in one embodiment, the first diaphragm 11 includes a first folded ring 111, the second diaphragm 12 includes a second folded ring 121, and the intermediate septum 13 includes a deformable portion 132; the first folded ring 111 protrudes away from the second diaphragm 12, and the deformable portion 132 protrudes towards the second diaphragm 12. Thus, the intermediate septum 13 and the first diaphragm 11 will not interfere with each other during vibration, and it is convenient to position the intermediate septum 13 closer to the accommodating space, further reducing the effective vibration area of ​​the intermediate septum 13.

[0090] In one embodiment, the second diaphragm 12 includes a second folded ring 121, and the intermediate septum 13 includes a deformable portion 132. The second folded ring 121 protrudes towards the first diaphragm 11, and the deformable portion 132 protrudes away from the first diaphragm 11. The second folded ring 121 and the deformable portion 132 are offset in the horizontal direction, which is perpendicular to the vibration direction. This ensures sufficient vibration space between the intermediate septum 13 and the second diaphragm 12, preventing interference between them during vibration.

[0091] In the above embodiments, when the first diaphragm 11, the second diaphragm 12 and the deformable portion 132 of the intermediate diaphragm 13 vibrate together, the three will not interfere with each other, thereby ensuring that the sound-generating device 1 has excellent sound quality.

[0092] Reference Figures 1a to 1c As shown, in one embodiment, the outer shell 10 includes a first shell 101 and a second shell 102, the first shell 101 and the second shell 102 enclosing an accommodating space, the outer edge of the first diaphragm 11 is fixed to the first shell 101, the outer edge of the second diaphragm 12 is sandwiched between the first shell 101 and the second shell 102, and the first sound outlet 100 is provided in the first shell 101.

[0093] In this specific example, the outer casing 10 includes a first casing 101 and a second casing 102, with the outer edge of the second diaphragm 12 sandwiched between the first casing 101 and the second casing 102. This arrangement simplifies the assembly process of the sound-generating device, improves production efficiency, and enhances the connection reliability of the second diaphragm 12. Furthermore, since the outer edge of the second diaphragm 12 is sandwiched between the first casing 101 and the second casing 102, the height of the outer casing 10 can be adjusted according to the amplitude requirements of the sound-generating device 1 to increase or decrease the vibration space between the intermediate septum 13 and the second diaphragm 12, thereby adapting to the needs of different products.

[0094] Reference Figure 1b As shown, in one embodiment, the first housing 101 includes a first sidewall 1011 and an inner bent wall 1012. The inner bent wall 1012 is formed by bending and extending the first sidewall 1011 into the accommodating space. The outer edge of the first diaphragm 11 and the outer edge of the intermediate septum 13 are both fixed to the inner bent wall 1012. The first sound outlet 100 is opened in the first sidewall 1011 or the inner bent wall 1012 of the first housing 101.

[0095] In this specific example, the first housing 101 further includes a first sidewall 1011 and an inner bent wall 1012. The inner bent wall 1012 provides effective support and connection for the outer edge of the first diaphragm 11 and the outer edge of the intermediate septum 13. The outer edge of the second diaphragm 12 is sandwiched between the first sidewall 1011 and the second housing 102. The first sidewall 1011 provides effective support and connection for the outer edge of the second diaphragm 12.

[0096] In this embodiment, the outer edges of the intermediate septum 13 and the first diaphragm 11 are both fixed to the outer side of the inner bent wall 1012, or the outer edges of the intermediate septum 13 and the first diaphragm 11 are respectively fixed to the inner and outer sides of the inner bent wall 1012. No limitation is imposed, and the choice can be made flexibly according to the actual situation.

[0097] In this embodiment, the first diaphragm 11 further includes a first flange 110 located outside the outer edge of the first diaphragm 11, and the first flange 110 is connected to the first sidewall 1011; this can improve the connection stability of the first diaphragm 11 and the waterproof effect of the sound-generating device 1.

[0098] In this embodiment, the second diaphragm 12 further includes a second flange 120 located outside the outer edge of the second diaphragm 12, and the second flange 120 is connected to the first sidewall 1011 or the second housing 102; this can improve the connection stability of the second diaphragm 12 and the waterproof effect of the sound-generating device 1.

[0099] In this embodiment, the first housing 101 is made of metal, which further increases the accommodating space of the sound-generating device 1 and improves its heat dissipation performance. The second housing 102 can be made of metal or plastic, etc. The second housing 102 being made of metal further increases the accommodating space of the sound-generating device 1 and improves its heat dissipation performance. Further, referring to... Figures 1i-1j As shown, the magnetic yoke 18 is welded to either the first housing 101 or the second housing 102, improving the connection stability between the magnetic circuit system and the outer casing 10. Specifically, the magnetic yoke 18 has a welding protrusion 19 extending towards the first housing 101 or the second housing 102; or, the first housing 101 or the second housing 102 has a welding protrusion 19 extending towards the magnetic yoke 18; or, the welding connection between the first housing 101 or the second housing 102 and the magnetic yoke 18 is achieved through welding plates.

[0100] Reference Figure 1a , Figure 1bAs shown, in one embodiment, the sound-generating device further includes an elastic support 15 disposed between the second housing 102 and the second diaphragm 12. The elastic support 15 includes an outer fixing part 151, a vibrating arm 153, and an inner fixing part 152 connected in sequence. The outer fixing part 151 is sandwiched between the outer edge of the second diaphragm 12 and the second housing 102, and the inner fixing part 152 is connected to the inner edge of the second diaphragm 12. Specifically, the inner fixing part 152 is connected to the second vibrating plate 122.

[0101] In this specific example, the elastic support 15 is connected to the inner edge of the second diaphragm 12, and the inner edge of the second diaphragm 12 is connected to the first diaphragm 11. This ensures that the elastic support 15 achieves vertical constraint of the vibration system, improves vibration consistency, and reduces the risk of poor product performance caused by the polarization of the vibration system under large amplitude.

[0102] According to another embodiment of this application, refer to Figure 2 As shown, a sound-generating module is provided, which includes the sound-generating device 1 as described above; it also includes a module housing 2, a first sound-generating cavity Q1 is formed between the module housing 2 and the first diaphragm 11, the module housing 2 has a sound outlet 20, and the first sound-generating cavity Q1 is connected to the sound outlet 20.

[0103] The sound-generating module provided in this embodiment of the application, due to including the aforementioned sound-generating device 1, exhibits improved acoustic performance compared to conventional sound-generating modules under the same size conditions. In this sound-generating module, the first sound-generating cavity Q1 is connected to the sound outlet 20, and the second sound-generating cavity Q2 can also be connected to the sound outlet 20. Specifically, the sound-generating module has an airflow channel connecting the first sound outlet 100 and the sound outlet 20, and the second sound-generating cavity Q2 is connected to the sound outlet 20 via the first sound outlet 100 and the airflow channel.

[0104] According to yet another embodiment of this application, referring to Figure 3 and Figure 4 As shown, an electronic device is provided, which includes the sound-generating module as described above.

[0105] The electronic device provided in this application embodiment, due to including the aforementioned sound-generating module, achieves better acoustic performance while maintaining the same size as conventional electronic devices. The electronic device has an electronic device housing 3 to form an electronic device cavity 30, in which the sound-generating module is installed. The electronic device housing 3 also has an electronic device sound outlet 31, which communicates with the sound outlet 20 of the sound-generating module. The sound-generating module has a rear sound outlet channel 21, which communicates with the electronic device cavity 30; the effective volume of the electronic device cavity is ≥2.5cc. In the electronic device of this application embodiment, the rear sound outlet channel connects to the electronic device cavity 30, expanding the rear cavity space of the sound-generating module. This facilitates the diffusion of sound waves in the rear cavity, reduces the reaction force on the compressed air in the rear cavity during vibration when the effective vibration area of ​​the vibration system increases, thereby enabling large-amplitude vibration of the vibration system and improving the sound quality of the sound-generating module. Furthermore, the larger cavity volume provides better heat dissipation space, helping to reduce the temperature of the sound-generating module, thus improving its stability and service life.

[0106] In one embodiment, such as Figure 4 As shown, the magnetic circuit system of the sound-generating device is exposed in the module housing 2, and the sound-generating device is provided with a rear sound outlet channel 21. At this time, the electronic device cavity 30 is directly connected to the space behind the vibration system of the sound-generating device. Optionally, a rear sound outlet channel can be provided on the magnetic circuit system of the sound-generating device; or, a rear sound outlet channel can be provided on the outer shell of the sound-generating device; or, a rear sound outlet channel can be provided on both the magnetic circuit system and the outer shell of the sound-generating device. Specifically, when a rear sound outlet channel is provided on the magnetic circuit system of the sound-generating device, the rear sound outlet channel 21 is a leakage hole provided on the magnetic yoke 18.

[0107] In other embodiments, such as Figure 3 As shown, a rear acoustic cavity 22 is formed between the module housing 2 and the sound-generating device. A rear sound outlet channel 21 is disposed on the module housing 2, connecting the rear acoustic cavity 22 and the electronic device cavity 30. The diameter of the rear sound outlet channel 21 is ≥2.0mm. Specifically, the rear sound outlet channel is a circular through hole with a diameter greater than or equal to 2.0mm, which is more conducive to the diffusion of sound waves from the rear acoustic cavity 22 of the sound-generating module. It should be noted that in this embodiment, it is not necessary to provide damping components or other structures to cover the rear sound outlet channel. The function of the rear sound outlet channel 21 in this application is different from that of a traditional equalizing hole.

[0108] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A sound-generating device, characterized in that, The sound-generating device includes: An outer casing having a receiving space; A magnetic circuit system is disposed in the accommodating space. The magnetic circuit system includes a magnetic yoke and an inner magnetic part and a side magnetic part disposed on the magnetic yoke. The side magnetic part is located outside the inner magnetic part. A magnetic gap is formed between the inner magnetic part and the side magnetic part. The side magnetic part is provided with a notch. A vibration system, the vibration system including a voice coil, the voice coil being at least partially disposed in the magnetic gap, the voice coil having a first protrusion extending into a notch in the outer magnetic portion, the inner magnetic portion having a second protrusion, the second protrusion being disposed corresponding to the first protrusion.

2. The sound-generating device according to claim 1, characterized in that, The voice coil is rectangular, and the first protrusion is located at the four corners of the voice coil.

3. The sound-generating device according to claim 1, characterized in that, The first protrusion has two opposing first sides, and the second protrusion has two opposing second sides, with the first sides and the second sides arranged in parallel.

4. The sound-generating device according to claim 3, characterized in that, The notch of the edge magnetic part has two opposing third sides, which are arranged parallel to the first side.

5. The sound-generating device according to claim 3, characterized in that, The inner magnetic part includes an inner magnet and an inner magnetic guide plate that are matched in shape and size. The inner magnet is sandwiched between the inner magnetic guide plate and the magnetic yoke. The second protrusion includes a first sub-protrusion and a second sub-protrusion. The first sub-protrusion extends from the inner magnet and the second sub-protrusion extends from the inner magnetic guide plate. The first protrusion, the first sub-protrusion, and the second sub-protrusion are all correspondingly arranged. The first sub-protrusion has two oppositely arranged first sub-sides, and the second sub-protrusion has two oppositely arranged second sub-sides. The first sub-sides and the second sub-sides form the second side. The first side, the first sub-side, and the second sub-sides are arranged in parallel.

6. The sound-generating device according to claim 4, characterized in that, The side magnetic part includes a side magnet and a side magnetic plate that are matched in shape and size. The side magnet is sandwiched between the side magnetic plate and the magnetic yoke. Both the side magnet and the side magnetic plate are provided with the notch. The side magnet has two oppositely arranged third sub-sides at its notch, and the side magnetic plate has two oppositely arranged fourth sub-sides at its notch. The third sub-sides and the fourth sub-sides form the third side. The third sub-sides, the fourth sub-sides and the first side are arranged in parallel.

7. The sound-generating device according to any one of claims 1-6, characterized in that, The vibration system further includes a first diaphragm, a second diaphragm, and an intermediate septum. The first diaphragm is disposed on the side of the housing away from the magnetic circuit system, the second diaphragm is disposed on the side of the first diaphragm facing the magnetic circuit system, and the intermediate septum is disposed between the first diaphragm and the second diaphragm. The intermediate septum is a flexible component. The voice coil is connected to the first diaphragm, and the second diaphragm and the intermediate septum are located outside the voice coil. The outer edges of the second diaphragm and the intermediate septum are both connected to the housing, and the inner edges of the second diaphragm and the intermediate septum are both connected to the first diaphragm. A sealed second sound cavity is formed between the second diaphragm and the intermediate septum. The housing has a first sound outlet, and the second sound cavity communicates with the first sound outlet.

8. The sound-generating device according to claim 7, characterized in that, The first diaphragm includes a first folded ring and a first vibrating plate. The outer edge of the first folded ring is connected to the outer shell, and the inner edge of the first folded ring is connected to the first vibrating plate. The second diaphragm includes a second folded ring and a second vibrating plate. The outer side of the second folded ring is connected to the outer shell, and the inner side of the second folded ring is connected to the outer side of the second vibrating plate. The inner side of the second vibrating plate is integrally bent and extends to the first vibrating plate and is connected to the first vibrating plate.

9. The sound-generating device according to claim 8, characterized in that, The intermediate diaphragm includes an outer connecting portion, a deformable portion, and an inner connecting portion. The deformable portion is located between the outer connecting portion and the inner connecting portion. The outer connecting portion is connected to the outer shell. The inner connecting portion is located between the inner edges of the first vibrating plate and the second vibrating plate. The effective vibration area of ​​the intermediate diaphragm is smaller than the effective vibration area of ​​the second diaphragm, and the ratio of the effective vibration area of ​​the intermediate diaphragm to the effective vibration area of ​​the second diaphragm is 1:1.5 to 1:

3.

10. The sound-generating device according to claim 8, characterized in that, The sound-generating device further includes an elastic support member disposed on the side of the second diaphragm away from the first diaphragm. The elastic support member includes an outer fixing part, a vibrating arm, and an inner fixing part connected in sequence. The outer fixing part is fixed to the outer shell, the inner fixing part is fixed to the second vibrating plate, and the inner fixing part is provided with a solder pad electrically connected to the voice coil.

11. The sound-generating device according to claim 10, characterized in that, The inner fixing part includes a body part and an extension part extending from the body part toward the voice coil and connected to the voice coil. The body part is fixed to the second diaphragm, the extension part is connected to the first protrusion, and the extension part or the body part is provided with a solder pad that is electrically connected to the voice coil.

12. A sound-generating module, characterized in that, The sound-generating module includes a sound-generating device as described in any one of claims 7-11; it also includes a module housing, wherein a first sound-generating cavity is formed between the module housing and the first diaphragm, the module housing has a sound outlet, and the first sound cavity communicates with the sound outlet.

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