Conductive diaphragm and sound generation device

Abstract

Provided in the present invention is a conductive diaphragm, which comprises a main body part and a conductive part arranged in the main body part, wherein the conductive part comprises a matrix and a conductive material, which is dispersed in the matrix. The matrix comprises a film layer, wherein the film layer is formed by curing at least one of a thermoplastic elastomer, phenyl silicone rubber, isoprene rubber and fluororubber. The conductive diaphragm provided in the present invention has good mechanical properties and fatigue resistance, and can still maintain relatively good bonding strength and toughness in the case where the filling amount of the conductive material is high.

Description

Conductive diaphragm and sound generating device TECHNICAL FIELD

[0001] The present application relates to the technical field of electroacoustics, and in particular to a conductive diaphragm and a sound generating device. BACKGROUND

[0002] At present, the conductive part of the conductive diaphragm commonly used in the field of loudspeakers mainly consists of a polymer matrix and a conductive filler. In order to reduce the resistance of the conductive part and improve its conductivity, it is necessary to increase the filling amount of the conductive filler in the polymer matrix when preparing the conductive diaphragm. However, if the filling amount of the conductive filler in the polymer matrix is too large, the toughness of the conductive part will be affected, thereby reducing the toughness of the conductive diaphragm and failing to meet the use requirements of the conductive diaphragm.

[0003] Therefore, there is a need for a new technical solution to meet the toughness requirements of the conductive diaphragm. TECHNICAL PROBLEM

[0004] The purpose of the present application is to provide a conductive diaphragm with good toughness. TECHNICAL SOLUTION

[0005] The technical solution of the present application is as follows: a conductive diaphragm, comprising a main body part and a conductive part arranged on the main body part, the main body part being a high polymer material, the conductive part comprising a matrix and a conductive material dispersed in the matrix,

[0006] Preferably, the metal powder comprises at least one of silver powder, gold powder, copper powder, aluminum powder and nickel powder. The matrix comprises a film layer, which is formed by curing at least one of thermoplastic elastomer, phenyl silicone, isoprene rubber and fluorine rubber.

[0007] Preferably, the conductive material accounts for 15wt% to 95wt% of the mass percentage of the conductive part, and the conductive material comprises at least one of metal powder, carbon-based particles and conductive composite powder.

[0008] Preferably, the carbon-based particles comprise at least one of carbon black, graphene and carbon nanotubes.

[0009] Preferably, the conductive composite powder comprises at least one combination of silver and gold, silver and copper, silver and nickel, silver and aluminum, silver and vanadium, silver and indium, and silver and palladium.

[0010] Preferably, the conductive material is at least one of spherical, flaky, rod-shaped or irregular polygonal particles.

[0011] Preferably, the main body part comprises at least one of polyether ether ketone, thermoplastic polyester elastomer, thermoplastic polyurethane elastomer, silicone rubber, ethylene-acrylate rubber, acrylate rubber and hydrogenated nitrile rubber.

[0012] Preferably, a part of the conductive part is embedded in the main body part, and another part of the conductive part is exposed to be electrically connected with an external circuit.

[0013] Preferably, the conductive part is coated or adhered to one side surface of the main body part; or the main body part and the conductive part are integrally injection molded.

[0014] The application also provides a sound generating device, which comprises a vibration system and a magnetic circuit system for driving the vibration system to vibrate and generate sound, wherein the vibration system comprises the conductive diaphragm as described above. Advantages

[0015] The conductive diaphragm provided by the application comprises a main body part and a conductive part, the conductive part comprises a base and a conductive material dispersed in the base, and the base comprises a film layer which is cured from at least one of thermoplastic elastomer, phenyl silicone rubber, isoprene rubber and fluorine rubber; so that the conductive part has excellent adhesive strength, mechanical properties and fatigue resistance, can still maintain good adhesive strength and toughness even if the conductive material has a high filling amount, has strong adaptability to different types of main body part materials, high adhesion and good toughness. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0017] Fig. 1 is a structural schematic diagram of the diaphragm when the conductive part of the application is embedded in the main body part;

[0018] Fig. 2 is a structural schematic diagram of the diaphragm when the conductive part of the application is arranged on one side of the main body.

[0019] In the drawings: conductive diaphragm 100, main body part 1, conductive part 2. Embodiment of the application

[0020] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0021] Referring to FIG. 1 and FIG. 2, the present application provides a conductive diaphragm 100, comprising a main body 1 and a conductive part 2 arranged on the main body 1, the conductive part 2 comprising a base and a conductive material dispersed in the base, the base comprising a film layer, the film layer being cured from at least one of thermoplastic elastomer, phenyl silicone rubber, isoprene rubber and fluorine rubber, so that the conductive part 2 has excellent elasticity, bonding strength, mechanical properties and fatigue resistance, can still maintain good bonding strength and toughness in the case of high filling amount of the conductive material, has strong adaptability to different types of main body 1 materials, high adhesion and good toughness.

[0022] Further, the conductive material accounts for 15wt% to 95wt% of the mass percentage of the conductive part 2, and the conductive material comprises at least one of metal powder, carbon particles and conductive composite powder.

[0023] Specifically, the metal powder comprises at least one of silver powder, gold powder, copper powder, aluminum powder and nickel powder. The carbon particles comprise at least one of carbon black, graphene and carbon nanotube. The conductive composite powder comprises at least one combination of silver and gold, silver and copper, silver and nickel, silver and aluminum, silver and vanadium, silver and indium and silver and palladium.

[0024] Optionally, the conductive material is at least one of spherical, flaky, rod-shaped or irregular polygonal particles.

[0025] The shape of the conductive material is highly related to the preparation process. The shapes of the conductive materials prepared by different processes are different, but their conductive properties are basically the same, but in reducing the contact resistance, different shapes and sizes of conductive materials need to be used in a certain proportion to achieve the target resistance value. The size of the conductive material is the maximum length of the conductive material. The size of the conductive material is related to the elongation at break of the base of the conductive part 2. The larger the size, the lower the elongation at break of the base of the conductive part 2 prepared by it, and the higher the roughness of its surface. Therefore, the appropriate size should be selected according to the actual needs. Preferably, the size of the conductive material is not more than 40μm.

[0026] Specifically, the main body 1 comprises at least one of polyether ether ketone, thermoplastic polyester elastomer, thermoplastic polyurethane elastomer, silicone rubber, ethylene-acrylate rubber, acrylate rubber and hydrogenated nitrile rubber.

[0027] Further, referring to Fig. 1, a part of the conductive part 2 is embedded in the main body part 1, and another part of the conductive part 2 is exposed to be electrically connected with the voice coil of the sound production device and the external circuit. The conductive diaphragm 100 with the structure can effectively ensure the assembly stability of the conductive part 2 on the main body part 1, and the conductive part 2 embedded in the main body part 1 can reduce the thickness of the conductive diaphragm 100 to a certain extent and increase the design space of the product. In addition, the conductive part 2 embedded in the main body part 1 can improve the vibration consistency of the conductive part 2 and the main body part 1, improve the sound production effect of the conductive diaphragm 100, and the other part of the conductive part 2 exposed can facilitate the circuit connection operation.

[0028] Alternatively, referring to Fig. 2, the conductive part 2 is coated or bonded on one side surface of the main body part 1; or the main body part 1 and the conductive part 2 are integrally injection molded. That is, when the conductive part 2 is arranged on the surface of the main body part 1, the conductive part 2 and the main body part 1 can have various bonding modes, such as arranging the conductive part 2 on the surface of the main body part 1 by coating, or arranging the conductive part 2 on the surface of the main body part 1 by bonding, or arranging the conductive part 2 on the surface of the main body part 1 by integrally injection molding.

[0029] The application further provides a sound production device, which comprises a vibration system and a magnetic circuit system for driving the vibration system to vibrate and produce sound, wherein the vibration system comprises the conductive diaphragm 100 as described above.

[0030] Compared with the related art, the base of the conductive diaphragm provided by the application comprises a film layer, which is cured from at least one of thermoplastic elastomer, phenyl silicone, isoprene rubber and fluorine rubber; so that the conductive part has excellent adhesive strength, mechanical properties and fatigue resistance, can still maintain good adhesive strength and toughness in the case of high filling amount of conductive material, has strong adaptability to different types of main body part materials, high adhesion and good toughness.

[0031] The above is only an embodiment of the application, and it should be noted that those skilled in the art can make improvements without departing from the inventive concept, and these all belong to the protection scope of the application.

Claims

1. A conductive diaphragm comprising a main body portion and a conductive portion provided on the main body portion, the main body portion being a polymer material, the conductive portion comprising a matrix and a conductive material dispersed in the matrix, characterized in that, The base body comprises a film layer, which is cured by at least one of thermoplastic elastomer, phenyl silicone rubber, isoprene rubber and fluorine rubber.

2. The conductive diaphragm of claim 1, wherein, The conductive material accounts for 15wt%-95wt% of the conductive part, and the conductive material comprises at least one of metal powder, carbon-based particles and conductive composite powder.

3. The conductive diaphragm of claim 2, wherein, The metal powder comprises at least one of silver powder, gold powder, copper powder, aluminum powder and nickel powder.

4. The conductive diaphragm of claim 2, wherein, The carbon-based particles comprise at least one of carbon black, graphene and carbon nanotube.

5. The conductive diaphragm of claim 2, wherein, The conductive composite powder comprises at least one combination of silver and gold, silver and copper, silver and nickel, silver and aluminum, silver and vanadium, silver and indium and silver and palladium.

6. The conductive diaphragm of claim 1, wherein, The conductive material is at least one of spherical, flaky, rod-shaped or irregular polygonal particles.

7. The conductive diaphragm of claim 1, wherein The main body part comprises at least one of polyether ether ketone, thermoplastic polyester elastomer, thermoplastic polyurethane elastomer, silicone rubber, ethylene-acrylate rubber, acrylate rubber and hydrogenated nitrile rubber.

8. The conductive diaphragm of claim 1, wherein, Part of the conductive part is embedded in the main body part, and another part of the conductive part is exposed to be electrically connected with an external circuit.

9. The conductive diaphragm of claim 1, wherein, The conductive part is coated or bonded on one side surface of the main body part; or the main body part and the conductive part are integrally injection molded.

10. A sound producing device, characterized by The vibration system comprises a conductive diaphragm as claimed in any one of claims 1-9.

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