Diaphragm assembly, sound-generating unit, sound-generating device and electronic equipment

Abstract

The present invention discloses a diaphragm assembly, a sound-emitting unit, a sound-emitting device and an electronic device. The diaphragm assembly includes a diaphragm body and a dome. The diaphragm body includes a central part, a folding ring part and a fixing part. The fixing part is arranged around the periphery of the folding ring part and connected to the folding ring part. The folding ring part is arranged around the periphery of the central part and connected to the central part. The dome is coated with a thermosetting adhesive layer, and the central part is combined with the thermosetting adhesive layer by injection molding or hot pressing. The diaphragm body is made of rubber material, and at least the surface part of the dome is made of metal material. The dome in the diaphragm assembly is combined with the central part by injection molding or hot pressing through the thermosetting adhesive layer coated outside the dome, so that the dome is integrally injected or hot pressed on the diaphragm body, which not only ensures the waterproof performance of the sound-emitting unit, but also the dome can be made of a material with good thermal conductivity, so that the dome can quickly radiate heat to the outside of the shell, thereby improving the heat dissipation performance of the diaphragm assembly and ensuring the acoustic performance and sensitivity of the sound-emitting unit.

Description

Technical Field

[0001] The present invention relates to the field of electroacoustic technology, and in particular to a diaphragm assembly, a sound-emitting unit, a sound-emitting device and an electronic device. Background Art

[0002] Speakers, as electroacoustic transducers, are widely used in electronic devices such as smart watches and smart bracelets. To ensure the waterproof performance of electronic devices, the diaphragm and dome in the speaker are usually injection molded or hot-pressed into one piece. Currently, the dome is usually made of materials with good injection molding or hot pressing affinity, such as PEN (Polyethylene naphthalate two formic acid glycol ester) or LCP (Liquid Crystal Polymer). However, domes made of these materials usually have poor thermal conductivity. As a result, when the heat generated by the voice coil is transferred to the dome, the dome is unable to radiate the heat outside the housing, resulting in poor heat dissipation effect of the speaker. Therefore, using a metal material with good thermal conductivity for the dome can help dissipate heat from the speaker. However, the metal dome has poor affinity with the rubber diaphragm through injection molding or hot pressing. During the vibration of the speaker diaphragm, the diaphragm and the dome are very likely to crack, affecting the acoustic performance and stability of the speaker. Summary of the Invention

[0003] The main purpose of the present invention is to provide a diaphragm assembly, a sound-emitting unit, a sound-emitting device and an electronic device, aiming to solve the problem of poor affinity between the metal dome and the rubber diaphragm during injection molding or hot pressing.

[0004] To achieve the above objectives, the present invention provides a diaphragm assembly, comprising:

[0005] A diaphragm body, the diaphragm body comprising a central portion, a rim portion, and a fixing portion, the fixing portion being disposed around and connected to the rim portion, the rim portion being disposed around and connected to the central portion;

[0006] A dome, wherein the dome is coated with a thermosetting adhesive layer, and the central portion is bonded to the thermosetting adhesive layer by injection molding or hot pressing;

[0007] The diaphragm body is made of rubber material, and at least the surface portion of the dome is made of metal material.

[0008] Optionally, the diaphragm body is made of ethylene acrylate rubber, and the central portion is hot-pressed to the thermosetting adhesive layer.

[0009] Optionally, the thermosetting adhesive layer includes an inner thermosetting adhesive film attached to the inner side of the dome and an outer thermosetting adhesive film attached to the outer side of the dome, and the inner thermosetting adhesive film and the outer thermosetting adhesive film are pressed together at the edge of the dome to form an extended edge.

[0010] Optionally, the dome includes a first reinforcing portion and a second reinforcing portion, the first reinforcing portion is protruding toward the outer thermosetting adhesive film, the second reinforcing portion is arranged around the periphery of the first reinforcing portion and connected to the first reinforcing portion, and the extended edge is arranged around the periphery of the second reinforcing portion.

[0011] Optionally, a center hole is opened on the central portion, and the second reinforcement portion is embedded in the center hole.

[0012] Optionally, an annular embedding groove is provided on the hole wall of the central hole, and the second reinforcement portion and the extension edge are embedded in the annular embedding groove.

[0013] Optionally, the annular groove separates the central portion into an inner layer and an outer layer, and the width of the inner layer is smaller than the width of the outer layer.

[0014] Optionally, the width of the extended edge is 0.050 mm to 0.100 mm.

[0015] Optionally, the thickness of the inner thermosetting adhesive film is 0.003 mm to 0.009 mm; the thickness of the outer thermosetting adhesive film is 0.003 mm to 0.009 mm.

[0016] Optionally, the dome is made of an aluminum-magnesium alloy; or, the dome is made of a titanium alloy; or, the dome is made of an aluminum alloy.

[0017] The present invention also proposes a sound-emitting unit, which includes a shell and a vibration system and a magnetic circuit system accommodated in the shell. The vibration system includes the diaphragm assembly as described above and a voice coil for driving the diaphragm assembly to vibrate. The outer periphery of the fixed part is fixed to the shell, the magnetic circuit system has a magnetic gap, one end of the voice coil is connected to the central part, and the other end of the voice coil is suspended in the magnetic gap.

[0018] The present invention further provides a sound-generating device, which includes a housing and the sound-generating unit as described above, wherein the sound-generating unit is accommodated in the housing.

[0019] The present invention further provides an electronic device, comprising a protective shell and the sound-generating device as described above, wherein the sound-generating device is accommodated in the protective shell.

[0020] In the technical solution of the present invention, the dome is combined with the central part of the rubber material by injection molding or hot pressing through a thermosetting adhesive layer covering the outside of the dome, so that the dome is integrally injection molded or hot pressed on the diaphragm body, which not only ensures the waterproof performance of the sound unit, but also the material selection of the dome is not restricted by the affinity of injection molding or hot pressing. That is, the dome can be made of a metal material with good thermal conductivity, so that the dome can quickly radiate the heat conducted by the voice coil to the outside of the shell, thereby improving the heat dissipation performance of the diaphragm assembly, effectively preventing the temperature rise of the sound unit from being too high, and ensuring the acoustic performance and sensitivity of the sound unit. In addition, the connection strength between the dome, the thermosetting adhesive layer and the central part is strong and not easy to crack, thereby improving the structural stability of the diaphragm assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a schematic structural diagram of a sound-emitting unit according to an embodiment of the present invention;

[0023] Figure 2 Schematic cross-sectional view of a sound-emitting unit according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic structural diagram of a diaphragm assembly according to an embodiment of the present invention;

[0025] Figure 4 for Figure 3 A magnified schematic diagram of area A in the middle;

[0026] Figure 5 Schematic diagram of an exploded view of the diaphragm body and the dome in the diaphragm assembly according to an embodiment of the present invention.

[0027] Description of Figure Numbers:

[0028]

[0029]

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in this embodiment with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0034] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] In addition, the technical solutions of the various embodiments of the present invention may be combined with each other, but this must be based on the premise that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is inconsistent or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the present invention.

[0036] In the present invention, the descriptions of directions such as "up", "down", "front", "back", "left", and "right" are as follows: Figure 3 The directions shown are for reference only and are used to explain the Figure 3 The relative positional relationship between the components in the shown posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] The present invention provides a diaphragm assembly.

[0038] like Figures 1 to 5 As shown, in one embodiment, the diaphragm assembly 100 includes a diaphragm body 10 and a dome 20, wherein the diaphragm body 10 includes a central portion 11, a folding ring portion 12 and a fixing portion 13, the fixing portion 13 is arranged around the periphery of the folding ring portion 12 and is connected to the folding ring portion 12, and the folding ring portion 12 is arranged around the periphery of the central portion 11 and is connected to the central portion 11; the dome 20 is covered with a thermosetting adhesive layer 30, and the central portion 11 and the thermosetting adhesive layer 30 are injection molded or hot-pressed; wherein the material of the diaphragm body 10 is rubber material, and the material of at least the surface portion of the dome 20 is metal material.

[0039] It should be noted that the diaphragm assembly 100 of the present invention is applied to a sound-emitting unit, which can be a speaker unit. The sound-emitting unit is applied to a sound-emitting device, which can be a speaker module. The sound-emitting device can be applied to electronic devices such as mobile phones, tablets, and wearable devices. The sound-emitting device in this embodiment is described by taking a speaker applied to wearable devices such as smart watches and smart bracelets as an example.

[0040] Specifically, if Figures 1 to 5 As shown, the diaphragm body 10 includes a central portion 11, a folding ring portion 12 disposed around the central portion 11, and a fixing portion 13 disposed around the folding ring portion 12, wherein the fixing portion 13 is used to fix to the housing 201, and the central portion 11 is injection-molded or hot-pressed with the dome 20. The central portion 11, the folding ring portion 12, and the fixing portion 13 are integrally formed rubber parts, that is, the diaphragm body 10 is an integrally formed rubber part, and at least the surface portion of the dome 20 is made of metal, that is, the dome 20 can be a metal part, or it can be a laminated structure with a metal surface portion and at least one of other non-metallic layers suitable for use in the dome, such as a foam layer, a carbon fiber layer, etc., between the metal materials. The surface of the dome 20 is covered with a thermosetting adhesive layer 30, that is, the thermosetting adhesive layer 30 completely wraps the dome 20 and is attached to the surface of the dome 20; when the central portion 11 of the diaphragm body 10 and the dome 20 are injection-molded or hot-pressed, since the dome 20 is covered with the thermosetting adhesive layer 30, and the thermosetting adhesive layer 30 has a large bonding force with the central portion 11 and a high affinity for injection molding or hot pressing, the thermosetting adhesive layer 30 can be directly integrated with the central portion 11 by injection molding or hot pressing, which not only avoids direct contact between the dome 20 and the central portion 11, but also ensures that the dome 20 and the central portion 11 are tightly connected. 1, so that the dome 20 can be stably fixed on the diaphragm body 10 during the vibration of the diaphragm body 10, and the structure is stable and reliable; moreover, the dome 20 containing metal material has good thermal conductivity. When the heat generated by the voice coil 2021 is conducted to the dome 20, the dome 20 containing metal parts can efficiently dissipate the heat to the outside of the shell 201, effectively reducing the temperature rise of the sound unit 200 by 10 degrees to 15 degrees, preventing the impedance value of the sound unit 200 from increasing, and ensuring the acoustic performance and sensitivity of the sound unit 200.

[0041] In the diaphragm assembly 100 of this embodiment, the dome 20 is combined with the central part 11 of rubber material by injection molding or hot pressing through the thermosetting adhesive layer 30 covering the outside of the dome 20, so that the dome 20 is integrally injection molded or hot pressed on the diaphragm body 10, which not only ensures the waterproof performance of the sound unit 200, but also the material selection of the dome 20 is not restricted by the affinity of injection molding or hot pressing. That is, the dome 20 can be made of metal material with good thermal conductivity, so that the dome 20 can quickly radiate the heat conducted by the voice coil 2021 to the outside of the shell 201, thereby improving the heat dissipation performance of the diaphragm assembly 100, effectively preventing the temperature of the sound unit 200 from rising too high, and ensuring the acoustic performance and sensitivity of the sound unit 200. In addition, the connection strength between the dome 20, the thermosetting adhesive layer 30 and the central part 11 is strong and not easy to crack, thereby improving the structural stability of the diaphragm assembly.

[0042] In a preferred embodiment, the diaphragm body 10 is made of ethylene acrylate rubber, and the dome 20 is made of an aluminum-magnesium alloy. The central portion 11 of the diaphragm body 10 is heat-pressed to the dome 20. Aluminum-magnesium alloy has the advantage of strong thermal conductivity, and using the dome 20 in this alloy further enhances the heat dissipation of the diaphragm assembly 100. In other embodiments, the dome 20 can also be made of other metal materials with good thermal conductivity, such as titanium alloy or aluminum, to ensure that the diaphragm assembly 100 meets the heat dissipation requirements of the speaker 200.

[0043] In one embodiment, the thermosetting adhesive layer 30 includes an inner thermosetting adhesive film 31 attached to the inner side of the dome 20 and an outer thermosetting adhesive film 32 attached to the outer side of the dome 20. The inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32 are pressed together at the edge of the dome 20 to form an extended edge 33. Figures 1 to 5 As shown, the side of the dome 20 facing the voice coil 2021 is the inner side of the dome 20, and the side of the dome 20 facing the housing 201 is the outer side of the dome 20. The thermosetting adhesive layer 30 includes an inner thermosetting adhesive film 31 and an outer thermosetting adhesive film 32 that are arranged opposite to each other. The inner thermosetting adhesive film 31 is laid on the inner side of the dome 20 and attached to the dome 20, and the outer thermosetting adhesive film 32 is laid on the outer side of the dome 20 and attached to the dome 20. The inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32 are laid on the outer side of the dome 20 and attached to the dome 20. The film 32 is used to completely wrap the dome 20 between the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32, so that the dome 20 can be injection molded or hot-pressed with the central part 11 through the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32, which not only ensures the connection strength between the dome 20 and the central part 11, but also ensures the waterproof performance of the diaphragm assembly 100. In addition, the dome 20 can be made of a material with good thermal conductivity, which improves the heat dissipation effect of the diaphragm assembly 100.

[0044] Furthermore, the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32 are press-fitted together near the outer edge on the outer periphery of the dome 20 to form an extended edge 33, that is, the area of ​​the inner thermosetting adhesive film 31 and the area of ​​the outer thermosetting adhesive film 32 are both larger than the area of ​​the dome 20, so that the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32 cooperate to cover the outside of the dome 20, ensuring that the central part 11 can be injection molded or hot-pressed with the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32, thereby ensuring the connection strength between the central part 11 and the dome 20. Furthermore, the width of the extended edge 33 is 0.050 mm to 0.100 mm, so that the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32 are tightly connected and stably covered on the outside of the dome 20, thereby improving the connection strength. Moreover, the extended edge 33 is arranged around the outer periphery of the dome 20 to prevent the end of the dome 20 from extending outside the thermosetting adhesive layer 30, avoiding direct contact between the dome 20 and the central portion 11, thereby improving the reliability of injection molding or hot pressing.

[0045] In one embodiment, the thickness of the inner thermosetting adhesive film 31 is 0.003 mm to 0.009 mm; the thickness of the outer thermosetting adhesive film 32 is 0.003 mm to 0.009 mm; the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32 are respectively attached to the inner and outer sides of the dome 20 to completely cover the dome 20 between the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32, and the thickness of the inner thermosetting adhesive film 31 and the outer thermosetting adhesive film 32 are reasonably set to further improve the connection strength; preferably, the thickness of the inner thermosetting adhesive film 31 is 0.006 mm, and the thickness of the outer thermosetting adhesive film 32 is 0.006 mm.

[0046] In other embodiments, nanocarbon can be coated on the outer surface of the dome 20 to form a nanocarbon layer, so that the dome 20 is injection molded or hot-pressed to the central part 11 through the nanocarbon layer; or, the dome 20 can be electrophoretically treated to cover the outer surface of the dome 20 with a layer of non-metallic material, so that the dome 20 is injection molded or hot-pressed to the central part 11 through the non-metallic layer; or, the dome 20 can be vacuum-coated to cover the outer surface of the dome 20 with a layer of non-metallic material, such as silicon, ceramic, etc., so that the dome 20 is injection molded or hot-pressed to the central part 11 through the non-metallic layer, which ensures that the connection strength between the dome 20 and the central part 11 meets the waterproof requirements and can also use a material with good thermal conductivity to make the dome 20, thereby improving the heat dissipation performance.

[0047] In one embodiment, the dome 20 includes a first reinforcement portion 21 and a second reinforcement portion 22. The first reinforcement portion 21 is protruding toward the outer thermosetting adhesive film 32. The second reinforcement portion 22 is disposed around the periphery of the first reinforcement portion 21 and connected to the first reinforcement portion 21. The extension edge 33 is disposed around the periphery of the second reinforcement portion 22. Figures 3 to 5As shown, the second reinforcing part 22 is arranged around the first reinforcing part 21. The first reinforcing part 21 protrudes outward to increase the structural strength, and a groove is formed inside the first reinforcing part 21. Adhesive can be filled in the groove to bond other components, and the groove plays a role in preventing the adhesive from overflowing. Further, a central hole 111 is formed in the central part 11, and the second reinforcing part 22 is embedded in the central hole 111. The second reinforcing part 22 protrudes toward the central hole 111 and is embedded in the central hole 111, and the top of the second reinforcing part 22 is higher than the central part 11, increasing the structural strength and improving the structural stability.

[0048] As Figures 3 to 5 shown, in an embodiment, an annular embedding groove 112 is formed on the hole wall of the central hole 111. The annular embedding groove 112 extends from the hole wall of the central hole 111 toward the folded ring part 12. The second reinforcing part 22 and the extending edge 33 are embedded in the annular embedding groove 112. The second reinforcing part 22 and the thermosetting glue layer 30 coated outside the second reinforcing part 22 extend into the annular embedding groove 112, so that the thermosetting glue layer 30 is injection-molded or hot-pressed with the groove wall of the annular embedding groove 112, and further the second reinforcing part 22 is stably clamped in the annular embedding groove 112, further increasing the connection strength between the dome 20 and the diaphragm body 10.

[0049] Further, the annular embedding groove 112 divides the central part 11 into an inner layer 113 and an outer layer 114. The width of the inner layer 113 is smaller than the width of the outer layer 114. As Figure 5 shown, the distance between the edge of the inner layer 113 and the bottom of the annular embedding groove 112 is d1, and the distance between the edge of the outer layer 114 and the bottom of the annular embedding groove 112 is d2, d1 < d2, that is, the width of the inner layer 113 is smaller than the width of the outer layer 114, which is convenient for embedding the second reinforcing part 22 into the annular embedding groove 112, and the structural design is reasonable.

[0050] The present invention also proposes a sounding monomer 200. The sounding monomer 200 includes a housing 201, a vibration system 202 and a magnetic circuit system 203 housed in the housing 201. The vibration system 202 includes the diaphragm assembly 100 as described above and a voice coil 2021 for driving the diaphragm assembly 100 to vibrate. The outer periphery of the fixing part 13 is fixed to the housing 201. The magnetic circuit system 203 has a magnetic gap 2031. One end of the voice coil 2021 is connected to the central part 11, and the other end of the voice coil 2021 floats in the magnetic gap 2031. As Figures 1 to 5As shown, the sound unit 200 includes a shell 201, a vibration system 202 and a magnetic circuit system 203, wherein the vibration system 202 includes a voice coil 2021 and a diaphragm assembly 100, and the vibration system 202 and the magnetic circuit system 203 are both installed in the shell 201, the magnetic circuit system 203 has a magnetic gap 2031, the voice coil 2021 is inserted in the magnetic gap 2031 and the voice coil 2021 is connected to the central part 11 of the diaphragm body 10; the specific structure of the diaphragm assembly 100 refers to the above embodiment. Since the sound unit 200 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0051] The present invention also proposes a sound-emitting device, which includes a shell and the sound-emitting unit 200 as described above. The sound-emitting unit 200 is accommodated in the shell. The specific structure of the sound-emitting unit 200 refers to the above embodiment. Since the sound-emitting device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0052] The present invention also proposes an electronic device, which includes a protective shell and the sound-emitting device as described above. The sound-emitting device is housed in the protective shell. The specific structure of the sound-emitting device refers to the above embodiment. Since the electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A diaphragm assembly, characterized in that: The diaphragm assembly comprises: A diaphragm body, the diaphragm body comprising a central portion, a folding ring portion and a fixing portion, the fixing portion being arranged around the outer periphery of the folding ring portion and connected to the folding ring portion, the folding ring portion being arranged around the outer periphery of the central portion and connected to the central portion; A dome, the dome is coated with a thermosetting adhesive layer, and the central portion is combined with the thermosetting adhesive layer by injection molding or hot pressing; Wherein, the material of the diaphragm body is rubber material, and at least the surface part of the dome is metal material; The thermosetting adhesive layer includes an inner thermosetting adhesive film attached to the inner side of the dome and an outer thermosetting adhesive film attached to the outer side of the dome. The inner thermosetting adhesive film and the outer thermosetting adhesive film are pressed together at the edge of the dome to form an extended edge.

2. The diaphragm assembly according to claim 1, characterized in that: The material of the diaphragm body is ethylene acrylate rubber, and the central portion is thermally pressed and bonded to the thermosetting adhesive layer.

3. The diaphragm assembly according to claim 1, characterized in that: The dome includes a first reinforcement portion and a second reinforcement portion, wherein the first reinforcement portion is protruding toward the outer thermosetting adhesive film, the second reinforcement portion is arranged around the periphery of the first reinforcement portion and connected to the first reinforcement portion, and the extension edge is arranged around the periphery of the second reinforcement portion.

4. The diaphragm assembly according to claim 3, characterized in that: The central portion is provided with a central hole, and the second reinforcing portion is embedded in the central hole.

5. The diaphragm assembly according to claim 4, characterized in that: An annular embedding groove is provided on the hole wall of the central hole, and the second reinforcing portion and the extended edge are embedded in the annular embedding groove.

6. The diaphragm assembly according to claim 5, characterized in that: The annular embedding groove separates the central portion into an inner layer and an outer layer, and the width of the inner layer is smaller than the width of the outer layer.

7. The diaphragm assembly according to claim 1, characterized in that: The width of the extended edge is 0.050 mm to 0.100 mm.

8. The diaphragm assembly according to claim 1, characterized in that: The thickness of the inner thermosetting adhesive film is 0.003 mm to 0.009 mm; the thickness of the outer thermosetting adhesive film is 0.003 mm to 0.009 mm.

9. The diaphragm assembly according to any one of claims 1 to 8, characterized in that: The dome is made of an aluminum-magnesium alloy; or, the dome is made of a titanium alloy; or, the dome is made of an aluminum alloy.

10. A sound-emitting unit, characterized in that: The sound unit includes a shell and a vibration system and a magnetic circuit system accommodated in the shell, the vibration system includes a diaphragm assembly as described in any one of claims 1 to 9 and a voice coil for driving the diaphragm assembly to vibrate, the outer periphery of the fixed part is fixed to the shell, the magnetic circuit system has a magnetic gap, one end of the voice coil is connected to the central part, and the other end of the voice coil is suspended in the magnetic gap.

11. A sound-generating device, characterized in that: The sound-generating device comprises a housing and a sound-generating unit as claimed in claim 10, wherein the sound-generating unit is accommodated in the housing.

12. An electronic device, characterized in that: The electronic device comprises a protective shell and the sound-generating device as claimed in claim 11, wherein the sound-generating device is accommodated in the protective shell.

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