Sound production apparatus, sound production module and electronic device

Abstract

The present application discloses a sound production apparatus, a sound production module and an electronic device. The sound production apparatus comprises a housing, a magnetic circuit system and a vibration system; the housing is provided with an accommodating space, and the housing is provided with a first sound outlet hole; the magnetic circuit system is arranged in the accommodating space, and the magnetic circuit system has a magnetic gap; the vibration system comprises a first diaphragm, a second diaphragm, an intermediate diaphragm and a voice coil, wherein the first diaphragm is arranged on the side of the housing away from the magnetic circuit system, the second diaphragm is arranged on the side of the first diaphragm facing the magnetic circuit system, and the intermediate diaphragm is arranged between the first diaphragm and the second diaphragm; the voice coil is at least partially arranged in the magnetic gap, the voice coil is connected to the first diaphragm, and the second diaphragm and the intermediate diaphragm are located on the outer side of the voice coil; the outer edges of the second diaphragm and the intermediate diaphragm are both connected to the housing, and the inner edges of the second diaphragm and the intermediate diaphragm are both connected to the first diaphragm; and a closed second sound production cavity is formed between the second diaphragm and the intermediate diaphragm, and the second sound production cavity is communicated with the first sound outlet hole.

Description

A sound-generating device, a sound-generating module, and an electronic device Technical Field

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

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

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

[0006] The outer casing has an accommodating space and a first sound outlet.

[0007] A magnetic circuit system disposed in the accommodating space, the magnetic circuit system having a magnetic gap;

[0008] A vibration system comprising a first diaphragm, a second diaphragm, a middle septum, and a voice coil, wherein 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 middle septum is disposed between the first diaphragm and the second diaphragm;

[0009] The voice coil is at least partially disposed in the magnetic gap, and the voice coil is connected to the first diaphragm, while the second diaphragm and the intermediate septum are located outside the voice coil;

[0010] The outer edges of the second diaphragm and the intermediate septum are both connected to the outer shell, 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, and the second sound cavity is connected to the first sound outlet.

[0011] Optionally, 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 diaphragm and is connected to the first diaphragm.

[0012] Optionally, the inner side of the second vibrating plate includes an inclined portion that is set at a predetermined angle to the vibration direction.

[0013] Optionally, the intermediate septum is a flexible component, and the intermediate septum includes an outer connecting portion, a deformable portion, and an inner connecting portion, with the deformable portion located between the outer connecting portion and the inner connecting portion;

[0014] The inner connecting portion is positioned closer to the first diaphragm than the outer connecting portion; or, the inner connecting portion is located between the inner edge of the first diaphragm and the inner edge of the second vibrating plate; or, the inner edge of the second vibrating plate is located between the first diaphragm and the inner connecting portion; or, the inner connecting portion and the inner edge of the second vibrating plate are respectively connected to the first diaphragm.

[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 first vibrating plate is provided with a first protrusion, and the first protrusion is connected to the second vibrating plate and the intermediate diaphragm.

[0016] Alternatively, the first diaphragm may include a first folded ring, a first vibrating plate, and a first support. The outer edge of the first folded ring is connected to the outer shell, the inner edge of the first folded ring is connected to the first vibrating plate, one end of the first support is connected to the first vibrating plate, and the other end of the first support is connected to the second vibrating plate and the intermediate septum.

[0017] Optionally, the first diaphragm includes a first folded ring and a first diaphragm plate, the outer edge of the first folded ring is connected to the outer shell, the inner edge of the first folded ring is connected to the first diaphragm plate, and the first diaphragm plate is provided with a second protrusion, the second protrusion being connected to the voice coil;

[0018] Alternatively, the first diaphragm may include a first folded ring, a first diaphragm plate, and a second support. The outer edge of the first folded ring is connected to the outer shell, the inner edge of the first folded ring is connected to the first diaphragm plate, one end of the second support plate is connected to the first diaphragm plate, and the other end of the second support plate is connected to the voice coil.

[0019] Optionally, the intermediate diaphragm is a flexible component, 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.

[0020] Optionally, in the projection along the vibration direction, the width of the deformed portion of the intermediate septum is greater than or equal to the width of the deformed portion of the second folded ring, and the ratio of the width of the deformed portion of the intermediate septum to the width of the deformed portion of the second folded ring is 1:1-3:1.

[0021] And / or, 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, the inner edge of the first folded ring is connected to the first vibrating plate, and the compliance of the second folded ring and the compliance of the first folded ring are both less than the compliance of the intermediate septum.

[0022] Optionally, a first rear cavity is formed between the first diaphragm and the intermediate septum, and a second rear cavity is formed between the first diaphragm, the second diaphragm, and the outer shell; the first rear cavity and the second rear cavity are connected, and a notch for connecting the first rear cavity and the second rear cavity is provided on the first protrusion or the first bracket.

[0023] Optionally, the first diaphragm includes a first folded ring, the intermediate septum includes a deformable portion, the first folded ring protrudes in a direction away from the second diaphragm, and the deformable portion protrudes in a direction close to the second diaphragm;

[0024] And / or, the intermediate diaphragm includes a deformable portion, the second fold protrudes toward the direction close to the first diaphragm, the deformable portion protrudes toward the direction away from the first diaphragm, and the second fold and the deformable portion are offset in the horizontal direction.

[0025] 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 diaphragm, and the inner fixing part is provided with a solder pad electrically connected to the voice coil.

[0026] 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 being connected to the second diaphragm, and the extension part or the body part being provided with a solder pad electrically connected to the voice coil;

[0027] And / or, the magnetic circuit system includes a magnetic yoke and an inner magnetic part and a side magnetic part disposed on the magnetic yoke, the magnetic gap being formed between the inner magnetic part and the side magnetic part, and the magnetic yoke being provided with a clearance structure to avoid the inner fixed part.

[0028] Optionally, the magnetic circuit system includes a magnetic yoke and an inner magnetic portion and a side magnetic portion disposed on the magnetic yoke. The side magnetic portion is disposed outside the inner magnetic portion, and the magnetic gap is formed between the inner magnetic portion and the side magnetic portion. The side magnetic portion is provided with a notch, and the voice coil has a first protrusion extending into the notch.

[0029] Optionally, the inner magnetic part has a second protrusion, which is disposed corresponding to the first protrusion.

[0030] 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.

[0031] Optionally, the notch of the edge magnetic part has two opposing third sides, which are arranged parallel to the first side.

[0032] Optionally, the outer casing includes a first housing and a second housing, the first housing and the second housing forming the accommodating space, the outer edge of the first diaphragm being fixed to the first housing, the outer edge of the second diaphragm being sandwiched between the first housing and the second housing, and the first sound outlet being disposed in the first housing.

[0033] Optionally, the first housing includes a first sidewall and an inner bent wall that bends from the first sidewall into the accommodating space, wherein the outer edge of the first diaphragm and the outer edge of the intermediate septum are fixed to the inner bent wall.

[0034] Optionally, the outer edge of the first diaphragm and the outer edge of the intermediate septum are both fixed to the outside of the inner bending wall or respectively fixed to the opposite sides of the inner bending wall;

[0035] And / or, the first diaphragm further includes a first flange located outside the outer edge of the first diaphragm, the first flange being connected to the first sidewall;

[0036] And / or, the second diaphragm further includes a second flange located outside the outer edge of the second diaphragm, the second flange being connected to the first sidewall or the second housing.

[0037] Optionally, the sound-generating device further includes an elastic support member disposed between the second housing and the second 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 sandwiched between the outer edge of the second diaphragm and the second housing, and the inner fixing part is fixed to the inner edge of the second diaphragm.

[0038] Optionally, the sound-generating device includes two opposing long axis sides and a short axis side connecting the two long axis sides, and the vibrating arm extends from the short axis side and along the long axis side.

[0039] 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.

[0040] Optionally, the sound-generating module has an airflow channel connecting the first sound outlet and the sound port, and the second sound-generating cavity is connected to the sound port via the first sound outlet and the airflow channel.

[0041] Optionally, the first sound outlet and the sound outlet are directly opposite each other and connected.

[0042] According to a third aspect of this application, an electronic device is provided, the electronic device including a sound-emitting module as described in the second aspect, the sound-emitting module having a rear sound output channel, the electronic device having an electronic device cavity, the rear sound output channel communicating with the electronic device cavity, and the effective volume of the electronic device cavity being ≥2.5cc.

[0043] In the sound-generating device provided in this application embodiment, since the second diaphragm and the intermediate septum also vibrate in addition to the first diaphragm while the voice coil vibrates, the effective vibration area of ​​the vibration system is increased, thereby improving the acoustic performance of the sound-generating device.

[0044] 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

[0045] 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.

[0046] Figure 1a shows an exploded structural diagram of a sound-generating device according to an embodiment of this application;

[0047] Figure 1b shows a cross-sectional structural schematic diagram of a sound-generating device according to an embodiment of this application;

[0048] Figure 1c shows a cross-sectional structural schematic diagram of a sound-generating device according to an embodiment of this application;

[0049] Figure 1d shows a cross-sectional structural schematic diagram of a sound-generating device according to an embodiment of this application;

[0050] Figure 1e shows a schematic diagram of the voice coil in a sound-generating device according to an embodiment of this application;

[0051] Figure 1f shows a schematic diagram of the structure of an elastic support member in a sound-generating device according to an embodiment of this application;

[0052] Figure 1g shows a partial structural schematic diagram of a sound-generating device according to an embodiment of this application;

[0053] Figure 1h shows a partial structural exploded view of a sound-generating device according to an embodiment of this application;

[0054] Figure 1i shows a schematic diagram of the overall structure of a sound-generating device according to an embodiment of this application;

[0055] Figure 1j shows a schematic diagram of the overall structure of a sound-generating device according to an embodiment of this application;

[0056] Figure 2 shows a structural schematic diagram of a sound-generating module according to an embodiment of this application;

[0057] Figure 3 is a schematic diagram of the structure of an electronic device according to an embodiment of this application;

[0058] Figure 4 shows a schematic diagram of the structure of an electronic device according to an embodiment of this application.

[0059] Explanation of reference numerals in the attached drawings: 1. Sound-generating device; 10. Outer shell; 101. First shell; 1011. First side wall; 1012. Inner bent wall; 102. Second shell; 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 side; 15. Elastic support Support component; 151, External fixing part; 152, Internal fixing 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 guide 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 guide plate; 1720, Fourth sub-side; 1721, First side magnetic guide plate; 1722, Second side magnetic guide plate; 18, Magnetic yoke; 180, Clearance structure; 19, Welded protrusion; 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

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] Referring to Figures 1a-2, according to an embodiment of this application, a sound-generating device 1 is provided. The sound-generating device 1 includes a housing 10, the housing 10 has an accommodating space, and the housing 10 has a first sound outlet 100.

[0066] It also includes a magnetic circuit system, which is disposed in the accommodating space and has a magnetic gap;

[0067] It also includes a vibration system, which includes a first diaphragm 11, a second diaphragm 12, a middle septum 13 and a voice coil 14. 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 middle septum 13 is disposed between the first diaphragm 11 and the second diaphragm 12.

[0068] The voice coil 14 is at least partially disposed in the magnetic gap, and the voice coil 14 is connected to the first diaphragm 11, while the second diaphragm 12 and the intermediate septum 13 are located outside the voice coil 14.

[0069] The outer edges of the second diaphragm 12 and the intermediate septum 13 are both connected to the outer shell 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, and the second sound cavity Q2 is connected to the first sound outlet 100.

[0070] In the sound-generating device 1 provided in this application 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.

[0071] In the sound-generating device 1 provided in this application 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, thereby improving the acoustic performance of the sound-generating device. That is, by increasing the effective vibration area of ​​the vibration system, the sound-generating device 1 provided in this application 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 application 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.

[0072] Referring to Figures 1a to 1c, in one embodiment, 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 diaphragm 11 and is connected to the first diaphragm 11.

[0073] Optionally, the inner side of the second vibrating plate 122 includes an inclined portion 1220 that is set at a predetermined angle to the vibration direction.

[0074] In this specific example, the second diaphragm 12 includes a second folded ring 121 made of flexible material and a second vibrating plate 122 made of rigid material. The second folded ring 121 and the second vibrating plate 122 are connected to each other, thereby improving the vibration performance of the second diaphragm 12. Furthermore, 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 in the sound-generating device 1 and saving internal volume. In addition, as shown in Figures 1a-1c, the inner portion of the second vibrating plate 122 includes an inclined portion 1220. The inclined portion 1220 enhances 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] Referring to Figures 1a to 1c, in one embodiment, the intermediate diaphragm 13 is a flexible member. The intermediate diaphragm 13 includes an outer connecting portion 131, a deformable portion 132, and an inner connecting portion 133. The outer connecting portion 131 is connected to the outer shell 10, the deformable portion 132 is located between the outer connecting portion 131 and the inner connecting portion 133, and the inner connecting portion 133 is connected to the second diaphragm 12 or the first diaphragm 11.

[0076] In this specific example, the intermediate septum 13 is made entirely of a flexible material, and its outer connecting part 131 is connected to the outer shell 10 to form a fixed end. Its effective vibration area for providing anti-phase acoustic waves is small, thus having minimal impact on the performance of the vibration system. Furthermore, the intermediate septum 13 serves a sealing and isolation function. Optionally, the intermediate septum can be a single-layer PEEK (polyether ether ketone) membrane, a composite PEEK (polyether ether ketone) membrane, etc.

[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] Referring to Figures 1b to 1d, 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] Referring to Figures 1b to 1d, 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 effective vibration area of ​​the intermediate diaphragm 13 is smaller than that of the second diaphragm 12, and 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.

[0084] 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, thus increasing the air volume 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] Referring to Figures 1a and 2, in one embodiment, a first rear cavity H1 is formed between the first diaphragm 11 and the intermediate septum 13, and a second rear cavity H2 is formed between the first diaphragm 11, the second diaphragm 12, and the outer shell 10; 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 protrusion 1121 is 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 has a notch for connecting the first rear cavity H1 and the second rear cavity H2.

[0090] In one embodiment, the first diaphragm 11, the second diaphragm 12, the outer shell 10, and the magnetic circuit system together form a second rear cavity H2. As shown in Figures 1b-1d and 2, 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 openings, and the first diaphragm 11, the second diaphragm 12, the outer shell 10, and the magnetic circuit system together form a second rear cavity H2.

[0091] Referring to FIG1b, 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 in a direction away from the second diaphragm 12, and the deformable portion 132 protrudes in a direction closer to 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.

[0092] 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.

[0093] 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.

[0094] Referring to FIG1a, in one embodiment, the sound-generating device further includes an elastic support 15. 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. 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.

[0095] Furthermore, the inner fixing part 152 includes a body part and an extension part extending toward and connected to the voice coil 14. The body part is connected to the second diaphragm 12, and the extension part or the body part is provided with a solder pad that is electrically connected to the voice coil 14.

[0096] Further, referring to FIG1f, 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. In addition, 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 axis sides and a short axis side connecting the two long axis sides. The vibrating arm 153 extends from the short axis side and along the long axis side. This helps to increase the vibrating arm length of the elastic support 15, ensuring its reliability when the sound-generating device operates at large amplitude.

[0097] Optionally, the elastic support 15 can be a single integral structure; or, the elastic support 15 can include two or four separate discrete structures.

[0098] Referring to Figures 1a, 1e, and 1g, in one embodiment, the magnetic circuit system includes a yoke 18 and an inner magnetic portion 16 and a side magnetic portion 17 disposed on the yoke 18. The side magnetic portion 17 is disposed outside the inner magnetic portion 16, and a magnetic gap is formed between the inner magnetic portion 16 and the side magnetic portion 17. The side magnetic portion 17 is provided with a notch, and the voice coil 14 has a first protrusion 140 extending into the notch. Further optionally, the inner magnetic portion 16 has a second protrusion, which is correspondingly disposed to the first protrusion 140.

[0099] In this specific example, the first protrusion 140 on the voice coil 14 reduces the distance between the voice coil 14 and the second diaphragm 12, facilitating the connection and assembly of the elastic support 15 and the voice coil 14. The inner magnet 16 has a second protrusion corresponding to the first protrusion 140. By matching the shape of the inner magnet 16 with the voice coil 14, the voice coil 14 can effectively utilize the magnetic field gap at the corner of the magnetic circuit system, increasing the BL of the sound-generating device 1 and thus improving its overall acoustic performance.

[0100] Furthermore, 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, the first protrusion 140 includes a first side 141 disposed opposite to each other, and the 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 protrusion 140, the first sub-protrusion 1610, and the second sub-protrusion 1620 are all disposed correspondingly.

[0101] Referring to Figures 1e and 1h, 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.

[0102] Referring to FIG1h, 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.

[0103] 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.

[0104] Furthermore, the side magnetic section 17 includes a side magnet 171 and a side magnetic guide plate 172. The notch includes both the notch structure formed by the side magnet 171 and the notch structure formed by the side magnetic guide plate 172. In addition, the side magnetic section 17 includes two opposing third sides at the notch; wherein the third sides are parallel to the first side 141. This ensures a uniform width of the magnetic gap, allowing the voice coil 14 to vibrate in a stable magnetic field.

[0105] Specifically, referring to FIG1h, 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.

[0106] More specifically, referring to Figure 1e, the voice coil 14 is roughly rectangular, so that the shape of the voice coil 14 better matches the outline of the sound-generating device. The four first protrusions 140 are located at the four corners of the rectangle, so that stress concentration is less likely to occur in the voice coil 14, thereby improving the service life of the voice coil 14.

[0107] 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.

[0108] More specifically, referring to FIG1h, the number of side magnets 171 and side magnetic plates 172 are both four. 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.

[0109] Further, referring to FIG1a, the inner magnetic part 16 and the side magnetic part 17 are mounted on the magnetic yoke 18. The magnetic yoke 18 is provided with a clearance structure 180 for avoiding the inner fixing part 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 of the sound generating device 1, and the leakage hole connects the internal space and the external space of the sound generating device.

[0110] In this sound-generating device 1, since the voice coil 14 has the aforementioned irregular shape design, and the shape of the magnetic circuit system is adapted to the voice coil, the voice coil 14 can effectively utilize the gap at the notch structure of the side magnetic part 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.

[0111] Referring to Figures 1a to 1c, in one embodiment, the outer shell 10 includes a first shell 101 and a second shell 102, which together form an accommodating space. The outer edge of the first diaphragm 11 is fixed to the first shell 101, and the outer edge of the second diaphragm 12 is sandwiched between the first shell 101 and the second shell 102. The first sound outlet 100 is disposed in the first shell 101.

[0112] 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.

[0113] Referring to FIG1b, 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 on the first sidewall 1011 or the inner bent wall 1012 of the first housing 101.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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, 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.

[0119] Referring to Figures 1a and 1b, in one embodiment, the sound-generating device further includes an elastic support member 15 disposed between the second housing 102 and the second diaphragm 12. The elastic support member 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 may be connected to the second vibrating plate 122.

[0120] In this specific example, the elastic support 15 is connected to the second diaphragm 12, and the inner edge of the second diaphragm 12 is connected to the first diaphragm 11, ensuring 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.

[0121] According to another embodiment of this application, as shown in FIG2, a sound-generating module is provided, the sound-generating module including the sound-generating device 1 as described above; and further including 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 having a sound outlet 20, and the first sound-generating cavity Q1 communicating with the sound outlet 20.

[0122] 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. Alternatively, as shown in FIG2, the first sound outlet 100 and the sound outlet 20 are directly opposite each other and connected.

[0123] According to another embodiment of this application, referring to Figures 3 and 4, an electronic device is provided, the electronic device including the sound-emitting module as described above.

[0124] 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.

[0125] In one embodiment, as shown in FIG4, 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.

[0126] In other embodiments, as shown in FIG3, 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.

[0127] 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: The outer casing has an accommodating space and a first sound outlet. A magnetic circuit system disposed in the accommodating space, the magnetic circuit system having a magnetic gap; A vibration system comprising a first diaphragm, a second diaphragm, a middle septum, and a voice coil, wherein 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 middle septum is disposed between the first diaphragm and the second diaphragm; The voice coil is at least partially disposed in the magnetic gap, and the voice coil is connected to the first diaphragm, while 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 outer shell, 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, and the second sound cavity is connected to the first sound outlet.

2. The sound-generating device according to claim 1, characterized in that, 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 diaphragm and is connected to the first diaphragm.

3. The sound-generating device according to claim 2, characterized in that, The inner side of the second vibrating plate includes an inclined portion that is set at a predetermined angle to the vibration direction.

4. The sound-generating device according to claim 2, characterized in that, The intermediate septum is a flexible component, and the intermediate septum includes an outer connecting part, a deformable part, and an inner connecting part, with the deformable part located between the outer connecting part and the inner connecting part; The inner connecting portion is positioned closer to the first diaphragm than the outer connecting portion; or, the inner connecting portion is located between the inner edge of the first diaphragm and the inner edge of the second vibrating plate; or, the inner edge of the second vibrating plate is located between the first diaphragm and the inner connecting portion; or, the inner connecting portion and the inner edge of the second vibrating plate are respectively connected to the first diaphragm.

5. The sound-generating device according to claim 2, 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 first vibrating plate is provided with a first protrusion, and the first protrusion is connected to the second vibrating plate and the intermediate diaphragm. Alternatively, the first diaphragm may include a first folded ring, a first vibrating plate, and a first support. The outer edge of the first folded ring is connected to the outer shell, the inner edge of the first folded ring is connected to the first vibrating plate, one end of the first support is connected to the first vibrating plate, and the other end of the first support is connected to the second vibrating plate and the intermediate septum.

6. The sound-generating device according to claim 1, characterized in that, The first diaphragm includes a first folded ring and a first diaphragm 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 diaphragm plate. The first diaphragm plate is provided with a second protrusion, and the second protrusion is connected to the voice coil. Alternatively, the first diaphragm may include a first folded ring, a first diaphragm plate, and a second support. The outer edge of the first folded ring is connected to the outer shell, the inner edge of the first folded ring is connected to the first diaphragm plate, one end of the second support plate is connected to the first diaphragm plate, and the other end of the second support plate is connected to the voice coil.

7. The sound-generating device according to claim 2, characterized in that, The intermediate diaphragm is a flexible component, and the effective vibration area of ​​the intermediate diaphragm is smaller than the effective vibration area of ​​the second diaphragm. 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.

8. The sound-generating device according to claim 7, characterized in that, In the projection along the vibration direction, the width of the deformed portion of the intermediate septum is greater than or equal to the width of the deformed portion of the second folded ring, and the ratio of the width of the deformed portion of the intermediate septum to the width of the deformed portion of the second folded ring is 1:1-3:

1. And / or, 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, the inner edge of the first folded ring is connected to the first vibrating plate, and the compliance of the second folded ring and the compliance of the first folded ring are both less than the compliance of the intermediate septum.

9. The sound-generating device according to claim 5, characterized in that, The first diaphragm and the intermediate septum form a first rear cavity, and the first diaphragm, the second diaphragm and the outer shell form a second rear cavity; the first rear cavity and the second rear cavity are connected, and a notch for connecting the first rear cavity and the second rear cavity is provided on the first protrusion or the first bracket.

10. The sound-generating device according to claim 2, characterized in that, The first diaphragm includes a first folded ring, and the intermediate septum includes a deformable portion. The first folded ring protrudes in a direction away from the second diaphragm, and the deformable portion protrudes in a direction close to the second diaphragm. And / or, the intermediate diaphragm includes a deformable portion, the second fold protrudes toward the direction close to the first diaphragm, the deformable portion protrudes toward the direction away from the first diaphragm, and the second fold and the deformable portion are offset in the horizontal direction.

11. The sound-generating device according to claim 1, 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 diaphragm, and the inner fixing part is provided with a solder pad electrically connected to the voice coil.

12. The sound-generating device according to claim 11, 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 connected to the second diaphragm, and the extension part or the body part is provided with a solder pad electrically connected to the voice coil. And / or, the magnetic circuit system includes a magnetic yoke and an inner magnetic part and a side magnetic part disposed on the magnetic yoke, the magnetic gap being formed between the inner magnetic part and the side magnetic part, and the magnetic yoke being provided with a clearance structure to avoid the inner fixed part.

13. The sound-generating device according to claim 1, characterized in that, The magnetic circuit system includes a magnetic yoke and an inner magnetic portion and a side magnetic portion disposed on the magnetic yoke. The side magnetic portion is disposed outside the inner magnetic portion, and a magnetic gap is formed between the inner magnetic portion and the side magnetic portion. The side magnetic portion is provided with a notch, and the voice coil has a first protrusion extending into the notch.

14. The sound-generating device according to claim 13, characterized in that, The inner magnetic part has a second protrusion, which is provided correspondingly to the first protrusion.

15. The sound-generating device according to claim 14, 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.

16. The sound-generating device according to claim 15, characterized in that, The notch of the edge magnetic part has two opposing third sides, which are arranged parallel to the first side.

17. The sound-generating device according to claim 1, characterized in that, The outer casing includes a first casing and a second casing, which together form the accommodating space. The outer edge of the first diaphragm is fixed to the first casing, and the outer edge of the second diaphragm is sandwiched between the first casing and the second casing. The first sound outlet is located in the first casing.

18. The sound-generating device according to claim 17, characterized in that, The first housing includes a first sidewall and an inner bent wall that bends from the first sidewall into the accommodating space, wherein the outer edge of the first diaphragm and the outer edge of the intermediate septum are fixed to the inner bent wall.

19. The sound-generating device according to claim 18, characterized in that, The outer edge of the first diaphragm and the outer edge of the intermediate septum are both fixed to the outside of the inner bending wall or respectively fixed to the opposite sides of the inner bending wall; And / or, the first diaphragm further includes a first flange located outside the outer edge of the first diaphragm, the first flange being connected to the first sidewall; And / or, the second diaphragm further includes a second flange located outside the outer edge of the second diaphragm, the second flange being connected to the first sidewall or the second housing.

20. The sound-generating device according to claim 18, characterized in that, The sound-generating device further includes an elastic support member disposed between the second housing and the second 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 sandwiched between the outer edge of the second diaphragm and the second housing, and the inner fixing part is fixed to the inner edge of the second diaphragm.

21. The sound-generating device according to claim 20, characterized in that, The sound-generating device includes two opposing long axis sides and a short axis side connecting the two long axis sides, and the vibrating arm extends from the short axis side and along the long axis side.

22. A sound-generating module, characterized in that, The sound-generating module includes a sound-generating device as described in any one of claims 1-21; 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-generating cavity communicates with the sound outlet.

23. The sound-generating module according to claim 22, characterized in that, The sound-generating module has an airflow channel connecting the first sound outlet and the sound outlet, and the second sound-generating cavity is connected to the sound outlet via the first sound outlet and the airflow channel.

24. The sound-generating module according to claim 22, characterized in that, The first sound outlet and the sound outlet are directly opposite each other and connected.

25. An electronic device, characterized in that, The electronic device includes a sound-emitting module as described in claims 22-24, the sound-emitting module having a rear sound output channel, the electronic device having an electronic device cavity, the rear sound output channel communicating with the electronic device cavity, and the effective volume of the electronic device cavity being ≥2.5cc.

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