CN111935625A - Composite diaphragm of sound production device, preparation method of composite diaphragm and sound production device - Google Patents
Composite diaphragm of sound production device, preparation method of composite diaphragm and sound production device Download PDFInfo
- Publication number
- CN111935625A CN111935625A CN202011010788.6A CN202011010788A CN111935625A CN 111935625 A CN111935625 A CN 111935625A CN 202011010788 A CN202011010788 A CN 202011010788A CN 111935625 A CN111935625 A CN 111935625A
- Authority
- CN
- China
- Prior art keywords
- rubber
- layer
- diaphragm
- thermoplastic elastomer
- composite diaphragm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/16—Layered products comprising a layer of natural or synthetic rubber comprising polydienes homopolymers or poly-halodienes homopolymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/001—Moulding aspects of diaphragm or surround
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/025—Diaphragms comprising polymeric materials
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a composite vibrating diaphragm of a sound generating device, a preparation method thereof and the sound generating device, wherein the composite vibrating diaphragm comprises at least one thermoplastic elastomer layer and at least one rubber layer, and the rubber layer is made of rubber compound; the rubber compound is obtained by mixing raw rubber and filler-containing raw materials, wherein the raw rubber comprises at least one of nitrile rubber and hydrogenated nitrile rubber, and the content of the raw rubber is 40-96% of the total amount of the rubber compound. The composite diaphragm provided by the invention can be used for solving the problem that demoulding is difficult due to the fact that the single-layer diaphragm of the nitrile rubber layer is easy to adhere to a mould in the forming process, the sensitivity is improved, the composite diaphragm has resilience and rigidity, the deformation of the diaphragm in the turnover process is reduced, and the yield of products is improved.
Description
Technical Field
The invention relates to the field of acoustic products, in particular to a composite vibrating diaphragm of a sound generating device, a preparation method of the composite vibrating diaphragm and the sound generating device.
Background
Sound generators are important acoustic devices for consumer electronics that convert electrical signals into sound. In recent years, consumer electronics have been developed rapidly, and the performance requirements of consumers on the electronics are higher and higher, and the application fields and environments of the electronics are more and more complicated. Under such application requirements, the performance of the sound emitting device also needs to be improved. The existing sound generating device usually adopts a vibrating diaphragm as a vibration sound generating element, and the vibrating diaphragm plays a crucial role in the sound reproduction performance of the sound generating device and determines the conversion quality from electric energy to sound energy of the sound generating device.
The existing sound generating device mainly adopts a nitrile rubber single-layer vibrating diaphragm, the nitrile rubber single-layer vibrating diaphragm has the characteristics of high temperature resistance, high damping, excellent chemical resistance, excellent waterproof performance and the like, and along with the requirements of the modern sound generating device on high water resistance, high temperature resistance and high quality, the nitrile rubber single-layer vibrating diaphragm is widely applied to the sound generating device.
But the nitrile rubber single-layer diaphragm at least has the following technical problems: in the forming process of the nitrile rubber single-layer vibrating diaphragm, the nitrile rubber single-layer vibrating diaphragm is easy to be tightly attached to a mold, so that the vibrating diaphragm is difficult to take the film, and meanwhile, the vibrating diaphragm is stretched and deformed in the film taking process, so that the yield of products is seriously influenced; in addition, the modulus of the nitrile rubber is 3-30MPa, the modulus is small, the thickness of the nitrile rubber single-layer vibrating diaphragm is large, the mass is large, and the medium-frequency sensitivity of the vibrating diaphragm is low.
In order to solve the technical problem, the nitrile rubber layer and the engineering plastic layer are compounded to form the composite vibrating diaphragm, so that the problem that demolding is difficult due to the fact that the single-layer vibrating diaphragm of the nitrile rubber layer is easily attached to a mold in the forming process can be solved, and the sensitivity of the vibrating diaphragm is improved.
However, in the process of implementing the embodiments of the present application, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: the composite diaphragm formed by compounding the nitrile rubber layer and the engineering plastic layer has low elongation at break and poor rebound resilience, so that the waterproof performance of the diaphragm product is reduced; and the vibrating diaphragm is easy to produce unrecoverable deformation in the process of turnover, the reject ratio is high, and the product cost is increased invisibly.
Therefore, the vibrating diaphragm not only can improve the problem that the nitrile rubber layer single layer vibrating diaphragm is easy to be attached to a mold in the forming process to cause difficulty in demolding, improves the sensitivity, but also has rebound resilience and rigidity, reduces the deformation of the vibrating diaphragm in the turnover process, ensures the quality, reduces the reject ratio, and becomes the technical problem to be solved urgently in the field.
Disclosure of Invention
The invention mainly aims to provide a composite vibrating diaphragm of a sound generating device, a preparation method of the composite vibrating diaphragm and the sound generating device, which can solve the problem that demoulding is difficult because a single-layer vibrating diaphragm of a nitrile rubber layer is easy to be attached to a mould in a forming process, improve sensitivity, have rebound resilience and rigidity, reduce deformation of the vibrating diaphragm in a turnover process and improve the yield of products.
The technical problem to be solved by the invention is realized by the following technical scheme:
the invention provides a composite vibrating diaphragm of a sound generating device, which comprises at least one thermoplastic elastomer layer and at least one rubber layer, wherein the rubber layer is made of rubber compound; the rubber compound is obtained by mixing raw rubber and filler-containing raw materials, wherein the raw rubber comprises at least one of nitrile rubber and hydrogenated nitrile rubber, and the content of the raw rubber is 40-96% of the total amount of the rubber compound.
Optionally, the nitrile rubber is made of butadiene-acrylonitrile copolymer, wherein the mass of acrylonitrile is 18-50% of the total mass of the butadiene-acrylonitrile copolymer.
Optionally, the hydrogenated nitrile rubber is prepared by hydrogenation reaction of a butadiene-acrylonitrile copolymer, wherein the mass of acrylonitrile is 18-50% of the total mass of the butadiene-acrylonitrile copolymer.
Optionally, the filler adopts at least one of carbon materials, silicon oxide, silicate, carbonate and sulfate; the mass of the filler is 1-45% of the total mass of the rubber compound.
Optionally, the raw materials of the rubber compound further comprise a vulcanizing agent, and a vulcanizing system of the vulcanizing agent comprises at least one of a sulfur vulcanizing system, a sulfur-free vulcanizing system, a peroxide vulcanizing system and a resin vulcanizing system; the mass of the vulcanizing agent is 0.5-5% of the total mass of the rubber compound.
Optionally, the raw materials of the rubber compound further comprise an auxiliary agent, wherein the auxiliary agent comprises at least one of a vulcanization accelerator, an anti-aging agent, a plasticizer and a coloring agent; the content of the auxiliary agent is 2-15% of the total amount of the rubber compound.
Optionally, the hardness of the rubber layer is 25-85A, the room-temperature storage modulus of the rubber layer is 2-35 MPa, and the loss factor of the rubber layer at room temperature is 0.1-1.
Optionally, the material of the thermoplastic elastomer layer is at least one selected from polyester thermoplastic elastomer, polyurethane thermoplastic elastomer, polyamide thermoplastic elastomer, polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer, polyvinyl chloride thermoplastic elastomer, PE/EPDM dynamic vulcanized elastomer, PP/EPDM dynamic vulcanized elastomer, and natural rubber/PP dynamic vulcanized elastomer.
According to another aspect of the present invention, a method for preparing the composite diaphragm of the sound generating apparatus is provided, which includes the following steps:
compounding the thermoplastic elastomer layer and the rubber layer together to form a composite film;
and forming the composite membrane to form the composite diaphragm.
Optionally, the preparation method of the rubber layer comprises: preparing a membrane body through a coating process, and drying the membrane body at low temperature to form an uncrosslinked rubber layer or a semi-crosslinked rubber layer; or the membrane body is made by a calendaring process, and the membrane body is an uncrosslinked rubber layer.
Optionally, the molding process is air pressure molding or compression molding.
According to another aspect of the present invention, a sound generating apparatus is provided, which includes the composite diaphragm.
The invention has the following beneficial effects:
in the invention, the rubber layer and the thermoplastic elastomer layer are creatively compounded to form the composite diaphragm, wherein the rubber layer is made of rubber compound; the rubber compound is obtained by mixing raw rubber and filler-containing raw materials, wherein the raw rubber comprises at least one of nitrile rubber and hydrogenated nitrile rubber, and the content of the raw rubber is 40-96% of the total amount of the rubber compound. The inventor discovers that the composite diaphragm has complementary functions and synergistic interaction, an unexpected technical effect is obtained, the problem that the single-layer diaphragm of the nitrile rubber layer is difficult to demould due to the fact that the diaphragm is easily attached to a die in the forming process can be solved, the intermediate frequency sensitivity is obviously improved, the composite diaphragm has good resilience and rigidity, and the composite diaphragm can be automatically recovered after the stressed contact deformation in the turnover process, so that the yield of the turnover process of the diaphragm is obviously improved.
Drawings
FIG. 1 is a graph showing the influence of filler content on the hardness and resilience of a rubber layer;
FIG. 2 is a graph showing the effect of filler content on the storage modulus and elongation at break of a rubber layer;
fig. 3 is a total harmonic distortion test curve of the diaphragm provided in example 1 of the present invention and the diaphragm in comparative example 1;
fig. 4 is a plot showing the loudness of the diaphragms of example 1 and comparative example 1 at different frequencies.
Detailed Description
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
Unless otherwise defined, terms used in the present specification have the same meaning as those generally understood by those skilled in the art, but in case of conflict, the definitions in the present specification shall control.
The use of "including," "comprising," "containing," "having," or other variations thereof herein, is meant to encompass the non-exclusive inclusion, as such terms are not to be construed. The term "comprising" means that other steps and ingredients can be added that do not affect the end result. The term "comprising" also includes the terms "consisting of …" and "consisting essentially of …". The compositions and methods/processes of the present invention comprise, consist of, and consist essentially of the essential elements and limitations described herein, as well as any of the additional or optional ingredients, components, steps, or limitations described herein.
All numbers or expressions referring to quantities of ingredients, process conditions, etc. used in the specification and claims are to be understood as modified in all instances by the term "about". All ranges directed to the same component or property are inclusive of the endpoints, and independently combinable. Because these ranges are continuous, they include every value between the minimum and maximum values. It should also be understood that any numerical range recited herein is intended to include all sub-ranges within that range.
As described in the background art, in the prior art, the composite diaphragm formed by compounding the nitrile rubber layer and the engineering plastic layer has low elongation at break and poor resilience, which leads to the decrease of the waterproof performance of the diaphragm product; and the vibrating diaphragm is easy to generate unrecoverable deformation in the process of turnover, the reject ratio is high, and the product cost is increased virtually, but the problem is not noticed. In order to solve the technical problem, the invention provides a composite diaphragm of a sound generating device, a preparation method of the composite diaphragm and the sound generating device.
In a first aspect, a composite diaphragm of a sound generating device is provided, which comprises at least one thermoplastic elastomer layer and at least one rubber layer, wherein the rubber layer is made of rubber compound; the rubber compound is obtained by mixing raw rubber and filler-containing raw materials, wherein the raw rubber comprises at least one of nitrile rubber and hydrogenated nitrile rubber, and the content of the raw rubber is 40-96% of the total amount of the rubber compound.
In the invention, a rubber layer and a thermoplastic elastomer layer are creatively compounded to form the composite diaphragm, wherein the rubber layer is made of rubber compound; the rubber compound is obtained by mixing raw rubber and filler-containing raw materials, wherein the raw rubber comprises at least one of nitrile rubber and hydrogenated nitrile rubber, and the content of the raw rubber is 40-96% of the total amount of the rubber compound. The inventor discovers that the composite diaphragm has complementary functions and synergistic interaction, an unexpected technical effect is obtained, the problem that the single-layer diaphragm of the nitrile rubber layer is difficult to demould due to the fact that the diaphragm is easily attached to a die in the forming process can be solved, the intermediate frequency sensitivity is obviously improved, the composite diaphragm has good resilience and rigidity, and the composite diaphragm can be automatically recovered after the stressed contact deformation in the turnover process, so that the yield of the turnover process of the diaphragm is obviously improved.
In the invention, the nitrile rubber is prepared from butadiene-acrylonitrile copolymer, and the molecular structural formula of the nitrile rubber can be shown as follows:
wherein x, y and z are natural numbers.
In the invention, the nitrile rubber has good temperature resistance, rebound resilience, chemical resistance and damping performance; the butadiene part has good molecular flexibility, so that the elasticity, resilience and low-temperature performance are excellent; the acrylonitrile moiety is strongly polar and therefore has good chemical resistance and high mechanical properties.
In the invention, the hydrogenated nitrile rubber is prepared by hydrogenation reaction of butadiene-acrylonitrile copolymer, and the molecular structural formula of the hydrogenated nitrile rubber can be shown as follows:
wherein x, y, m and n are natural numbers.
In the invention, the hydrogenated nitrile rubber is prepared by chemically crosslinking a butadiene-acrylonitrile copolymer after hydrogenation reaction, and the double bonds in butadiene are subjected to hydrogenation reaction, so that the hydrogenated butadiene unit is equivalent to an ethylene propylene rubber chain segment, and the hydrogenated nitrile rubber has good heat resistance, aging resistance and low-temperature performance.
In the nitrile rubber and the hydrogenated nitrile rubber, the mass of acrylonitrile is usually 15 to 60% of the total amount of the butadiene-acrylonitrile copolymer. The inventor finds that the mass of the acrylonitrile is controlled to be 18-50% of the total amount of the butadiene-acrylonitrile copolymer, the rubber layer has good rebound resilience, large damping and chemical resistance, the overall comprehensive performance is excellent, and an unexpected technical effect is achieved. If the mass of the acrylonitrile is less than 18 percent of the total mass of the butadiene-acrylonitrile copolymer, the rubber layer has good elasticity and rebound resilience and excellent low-temperature performance, but the chemical resistance is reduced and the damping is reduced; if the mass of the acrylonitrile is less than 50% of the total mass of the butadiene-acrylonitrile copolymer, the rubber layer has high damping and good chemical resistance, wear resistance and heat resistance, but the elasticity and low-temperature properties are deteriorated.
In the present invention, the raw rubber content is 40 to 96% of the total amount of the rubber compound, for example, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 96%, and any value therebetween. According to the invention, the resilience of the vulcanized rubber can be improved by controlling the content of the raw rubber to be 40-96% of the total amount of the rubber compound.
The nitrile rubber/hydrogenated nitrile rubber belongs to amorphous polymers, has low self-strength and has no self-reinforcement in the stretching process. In the invention, the filler is added, so that the tensile strength, the tearing strength, the wear resistance and the hardness of the nitrile rubber/hydrogenated nitrile rubber can be improved.
In the present invention, the kind of the filler is not particularly limited, and may be a general filler known to those skilled in the art, and preferably, the filler reinforcing agent includes at least one of a carbon-based material, silica, silicate, carbonate, and sulfate. Wherein for carbon-based materials, including but not limited to carbon black, graphite, graphene, carbon nanotubes, and the like; for silica, including but not limited to fumed silica, precipitated silica, and the like; for silicates, including, but not limited to, talc, bentonite, kaolin, china clay, wollastonite, diatomaceous earth, mica; for carbonates, including but not limited to calcium carbonate, magnesium carbonate; for sulfates, including but not limited to calcium sulfate, barium sulfate.
In the present invention, the mass of the filler is 1 to 45% of the total amount of the rubber compound, for example, 1%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% and any value therebetween. As shown in FIG. 1, the effect of the filler content on the hardness and resilience of the rubber layer; as shown in FIG. 2, the effect of the filler content on the storage modulus and elongation at break of the rubber layer is shown. The inventors have found in their studies that the hardness, tensile strength, storage modulus, tear properties and abrasion resistance of the rubber layer are improved with an increase in the filler content, but the rebound resilience and elongation at break are reduced. In the invention, the mass of the filler is controlled to be 1-45% of the total amount of the rubber compound, and the rubber layer has good hardness, tensile strength, storage modulus, rebound resilience and elongation at break.
In the present invention, the raw material of the rubber compound further includes a vulcanizing agent, and in the present invention, the kind of the vulcanizing agent is not particularly limited, and may be any of the usual vulcanizing agent kinds for nitrile rubber well known to those skilled in the art, and preferably, the vulcanizing system of the vulcanizing agent includes at least one of a sulfur vulcanizing system, a sulfur-free vulcanizing system, a peroxide vulcanizing system, and a resin vulcanizing system.
For sulfur curing systems, the sulfur curing system includes sulfur and a cure accelerator including, but not limited to, thiurams, thiazoles, sulfenamides, oxides.
For sulfur-free cure systems, the sulfur-free cure system includes thiurams including, but not limited to, tetramethylthiuram disulfide, tetraethylthiuram disulfide, dipentamethylenethiuram tetrasulfide, dithiomorphine.
For peroxide curing systems, but are not limited to, benzoyl 2, 4-dichloroperoxide, benzoyl peroxide, dicumyl peroxide, 2, 5-dimethyl-2, 5-di-t-butylperoxyhexane, di-t-butyl peroxide.
For resin curing systems, including but not limited to alkyl phenol-formaldehyde resins. The resin vulcanization system can crosslink polymers containing unsaturated bonds such as double bonds and ether bonds, has short vulcanization time and high vulcanization efficiency, can improve the heat resistance and flexing resistance of the polymers, and hardly has a vulcanization reversion phenomenon during vulcanization.
When the raw rubber is nitrile rubber, vulcanization may be performed by at least one of a sulfur vulcanization system, a sulfur-free vulcanization system, a peroxide vulcanization system, and a resin vulcanization system. When the raw rubber is hydrogenated nitrile rubber, the hydrogenated nitrile rubber is prepared by hydrogenation reaction of butadiene-acrylonitrile copolymer, and the amount of double bonds is reduced. If the hydrogenation degree is small, at least one of a sulfur vulcanization system, a sulfur-free vulcanization system, a peroxide vulcanization system and a resin vulcanization system can be adopted for vulcanization; if the degree of hydrogenation is high, only peroxide curing systems can be used.
In the present invention, the mass of the vulcanizing agent is 0.5 to 5% of the total amount of the rubber compound, for example, 0.5%, 0.8%, 1%, 2%, 3%, 4%, 5%, and any value therebetween. If the mass of the vulcanizing agent is less than 0.5 percent of the total mass of the rubber compound, the rubber layer has low crosslinking degree and poor rebound resilience, and is easy to deform and lose efficacy in the large-amplitude vibration process; if the mass of the vulcanizing agent is more than 5 percent of the total mass of the rubber compound, the crosslinking degree of the rubber layer is too high, the low-temperature resilience is poor, and the elongation at break is small, so that the low-temperature performance of the vibrating diaphragm is poor, and the diaphragm is easy to break. According to the invention, the mass of the vulcanizing agent is controlled to be 0.5-5% of the total amount of the rubber compound, so that the nitrile rubber/hydrogenated nitrile rubber has a proper crosslinking degree, and has good rebound resilience and elongation at break.
In the invention, the raw materials of the rubber compound can also comprise an auxiliary agent, wherein the auxiliary agent comprises at least one of a vulcanization accelerator, an anti-aging agent, a plasticizer and a coloring agent. The content of the auxiliary agent is 2-15% of the total amount of the rubber compound, such as 2%, 5%, 8%, 10%, 12%, 15% and any value therebetween.
The anti-aging agent is mainly used for stopping the reaction of nitrile rubber/hydrogenated nitrile rubber molecules under the action of thermal oxygen light and free radicals with the rubber molecules, so that the service life of the rubber is obviously prolonged, and the performance reduction of the rubber is reduced. In the present invention, the kind of the antioxidant is not particularly limited, and may be a kind of a commonly used antioxidant known to those skilled in the art, and examples thereof include at least one of antioxidant N-445, antioxidant 246, antioxidant 4010, antioxidant SP, antioxidant RD, antioxidant ODA, antioxidant OD and antioxidant WH-02. The content of the anti-aging agent is 0.5-3% of the total amount of the rubber compound.
The nitrile rubber/hydrogenated nitrile rubber has high viscosity in the mixing process due to high-CN polarity. The plasticizer is mainly used for improving the mixing property of the nitrile rubber, increasing the molecular chain spacing, reducing the system viscosity and improving the plasticity of the nitrile rubber. The kind of the plasticizer is not particularly limited, and may be a kind of a commonly used plasticizer well known to those skilled in the art, and preferably, the plasticizer includes at least one of coumarone resin, alkyd resin, liquid nitrile rubber, coal tar, dibutyl phthalate, dioctyl sebacate, tricresyl phosphate, dioctyl adipate, and epoxidized soybean oil.
The content of the plasticizer is 1.5-13% of the total amount of the rubber compound, the larger the content of the plasticizer is, the better the plasticity of the nitrile rubber/hydrogenated nitrile rubber is, but the plasticizer can be caused to migrate to the surface of the rubber to influence the product quality, and the more the plasticizer is, the compression permanent deformation of the rubber can be increased; if the plasticizer content is small, the nitrile rubber/hydrogenated nitrile rubber has poor plasticity, and the mixing process is difficult.
In the present invention, the material of the thermoplastic elastomer layer is not particularly limited, and may be a common thermoplastic elastomer well known to those skilled in the art, and the material of the thermoplastic elastomer layer is at least one selected from the group consisting of a polyester-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, a polyamide-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, a polyvinyl chloride-based thermoplastic elastomer, a PE/EPDM dynamic vulcanized elastomer, a PP/EPDM dynamic vulcanized elastomer, and a natural rubber/PP dynamic vulcanized elastomer, for example.
The F0 of the sound generating device is related to the Young modulus and the weight of the material, and the F0 of the diaphragm can be adjusted by adjusting the Young modulus of the material and the thickness of the diaphragm, wherein the calculation formula of the F0 is as follows:
wherein Mms is the equivalent vibration mass of the sounding device, and Cms is the equivalent compliance of the sounding device. The Young modulus of the material has positive correlation with the hardness of the material, and the higher the modulus of the material is, the higher the hardness of the material is; in order to ensure that the response performance of the diaphragm at low frequency is improved, F0 is generally required to be lower, but the diaphragm also needs to be ensured to have certain rigidity, so that the distortion caused by polarization generated in the vibration process of the large diaphragm is avoided. In the invention, the hardness of the rubber layer is 25-85A, and the room-temperature storage modulus of the rubber layer is 2-35 MPa, so that the diaphragm F0 can reach 500-1500hz, and the low-frequency performance is excellent.
In the invention, the storage modulus of the thermoplastic elastomer is higher than that of the rubber layer, and the modulus of the composite diaphragm formed by compounding the rubber layer and the thermoplastic elastomer is higher than that of a single-layer butyronitrile/hydrogenated butyronitrile, so that the thickness of the composite diaphragm can be thinner, the mass is smaller, and the medium-frequency response capability of the composite diaphragm is better.
In the invention, the loss factor of the rubber layer at room temperature is 0.1-1. The nitrile rubber/hydrogenated nitrile rubber has high-CN polarity and high resistance in the molecular chain segment movement process, so that the loss factor of the nitrile rubber/hydrogenated nitrile rubber is high, the loss factor of the rubber layer is 0.1-1 at room temperature, the rubber layer has good damping performance, the damping performance of the vibrating diaphragm is improved, the polarization of the vibrating diaphragm can be effectively inhibited in the vibration process, and the vibration consistency of each point of the vibrating diaphragm is excellent.
In the invention, the composite diaphragm can be a two-layer, three-layer, four-layer or five-layer composite diaphragm, wherein at least one layer is a thermoplastic elastomer layer, and at least one layer is a rubber layer, and a person skilled in the art can select a more optimal number of layers according to actual needs.
In a second aspect, a method for preparing the composite diaphragm of the sound generating device is provided, which includes the following steps:
compounding the thermoplastic elastomer layer and the rubber layer together to form a composite film;
and forming the composite membrane to form the composite diaphragm.
In the invention, the preparation method of the rubber layer comprises the following steps: preparing a membrane body through a coating process, and drying the membrane body at low temperature to form an uncrosslinked rubber layer or a semi-crosslinked rubber layer; or the membrane body is made by a calendaring process, and the membrane body is an uncrosslinked rubber layer.
Specifically, the rubber layer can be prepared into a membrane body by rolling the rubber compound through a calendaring process, the membrane body is an uncrosslinked rubber layer, and the membrane body is attached to the thermoplastic elastomer layer to form a composite membrane; or preparing the mixed rubber into a membrane body through a coating process, drying the membrane body at low temperature to form an uncrosslinked rubber layer or a semi-crosslinked rubber layer, and attaching the uncrosslinked rubber layer or the semi-crosslinked rubber layer to the thermoplastic elastomer layer to form the composite membrane. It is understood that the compounding method includes, but is not limited to, the above-listed compounding methods, and other compounding methods not listed in the present embodiment but known to those skilled in the art may be used.
In the embodiment of the present application, the specific drying temperature for the low-temperature drying is not particularly limited, and those skilled in the art can set the drying temperature according to actual needs as long as the film body is not chemically crosslinked or semi-chemically crosslinked during the drying process.
In the invention, the rubber layer is formed by adopting a coating process or a rolling process, so that chemical crosslinking or semi-chemical crosslinking is not generated; and in the process of forming the composite membrane, chemical crosslinking and shaping are carried out. The rubber layer is in an uncrosslinked or semi-crosslinked state when the thermoplastic elastomer layer and the rubber layer are adhered, and the rubber is not in a net structure but in a linear structure, so that the rubber layer is more easily infiltrated with the thermoplastic elastomer; and the rubber layer is vulcanized in the vibrating diaphragm forming process, and the rubber layer can be further infiltrated in the vulcanizing process, so that the bonding force between the rubber layer and the vibrating diaphragm is further increased. Therefore, the composite vibrating diaphragm can obviously increase the bonding force between the thermoplastic elastomer layer and the rubber layer, improve the reliability of the traditional composite vibrating diaphragm structure, and avoid the problems of layering and even breaking after long-term vibration. Compared with the traditional composite diaphragm of the thermoplastic elastomer layer and the film layer, the stripping force is obviously improved, and an unexpected technical effect is achieved.
In the invention, the molding treatment is air pressure molding or compression molding.
In a third aspect, the sound generating device comprises a magnetic circuit system and a vibration system which are matched with each other, wherein the vibration system comprises the diaphragm.
The sound generating device may be a sound generating device used in a portable device such as a headset, a mobile phone, a tablet computer, and a notebook computer, but is not limited thereto, and may be other sound generating devices that are not listed in the present embodiment but are well known to those skilled in the art.
In order to better understand the technical solutions, the technical solutions will be described in detail with reference to specific examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Example 1
A composite diaphragm of a sound generating device comprises at least one thermoplastic elastomer layer and at least one rubber layer;
the preparation method of the composite diaphragm comprises the following steps:
compounding the thermoplastic elastomer layer and the rubber layer together to form a composite film;
and carrying out air pressure forming or compression molding treatment on the composite membrane to form the composite diaphragm.
The preparation method of the rubber layer comprises the following steps: (1) providing a rubber compound; wherein, the rubber compound comprises the following raw materials by weight percent: 60% of raw rubber, 27% of filler, 3% of vulcanizing agent and 10% of auxiliary agent, wherein the sum of the weight of the raw materials is one hundred percent; (2) and preparing the rubber compound into a membrane body through a coating process, and drying the membrane body at low temperature to form an uncrosslinked rubber layer or a semi-crosslinked rubber layer.
The raw rubber is nitrile rubber, the nitrile rubber is made of butadiene-acrylonitrile copolymer, and the mass of acrylonitrile is 30% of the total mass of the butadiene-acrylonitrile copolymer.
The filler is carbon black.
The vulcanizing system of the vulcanizing agent comprises a sulfur vulcanizing system, the sulfur vulcanizing system comprises sulfur and a vulcanization accelerator, and the vulcanization accelerator is thiuram.
The auxiliary agent comprises an anti-aging agent and a plasticizer; the anti-aging agent comprises anti-aging agent N-445, and the content of the anti-aging agent is 2% of the total amount of the rubber compound; the plasticizer comprises alkyd resin, and the content of the plasticizer is 8% of the total amount of the rubber compound.
The thermoplastic elastomer layer is made of polyester thermoplastic elastomer.
Example 2
A composite diaphragm of a sound generating device comprises at least one thermoplastic elastomer layer and at least one rubber layer;
the preparation method of the composite diaphragm comprises the following steps:
compounding the thermoplastic elastomer layer and the rubber layer together to form a composite film;
and carrying out air pressure forming or compression molding treatment on the composite membrane to form the composite diaphragm.
The preparation method of the rubber layer comprises the following steps: (1) providing a rubber compound; wherein, the rubber compound comprises the following raw materials by weight percent: 40% of raw rubber, 45% of filler, 5% of vulcanizing agent and 10% of auxiliary agent, wherein the sum of the weight of the raw materials is one hundred percent; (2) and (3) preparing the rubber compound into a membrane body through a calendaring process, wherein the membrane body is an uncrosslinked rubber layer.
Wherein the raw rubber is hydrogenated nitrile rubber; the hydrogenated nitrile rubber is prepared by hydrogenation reaction of butadiene-acrylonitrile copolymer, wherein the mass of acrylonitrile is 18% of the total mass of the butadiene-acrylonitrile copolymer.
The filler is talcum powder and calcium sulfate, and the vulcanizing agent comprises 2, 4-dichlorobenzoyl peroxide.
The auxiliary agent comprises a plasticizer; the plasticizer comprises coal tar and dibutyl phthalate.
The thermoplastic elastomer layer is made of polyurethane thermoplastic elastomer and polyamide thermoplastic elastomer.
Example 3
A composite diaphragm of a sound generating device comprises at least one thermoplastic elastomer layer and at least one rubber layer;
the preparation method of the composite diaphragm comprises the following steps:
compounding the thermoplastic elastomer layer and the rubber layer together to form a composite film;
and carrying out air pressure forming or compression molding treatment on the composite membrane to form the composite diaphragm.
The preparation method of the rubber layer comprises the following steps: (1) providing a rubber compound; wherein, the rubber compound comprises the following raw materials by weight percent: 96% of raw rubber, 1% of filler, 0.5% of vulcanizing agent and 2.5% of auxiliary agent, wherein the sum of the weight of the raw materials is one hundred percent; (2) and preparing the rubber compound into a membrane body through a coating process, and drying the membrane body at low temperature to form an uncrosslinked rubber layer or a semi-crosslinked rubber layer.
Wherein the raw rubber comprises nitrile rubber and hydrogenated nitrile rubber; the nitrile rubber is prepared from butadiene-acrylonitrile copolymer, wherein the mass of acrylonitrile is 50% of the total mass of the butadiene-acrylonitrile copolymer; the hydrogenated nitrile rubber is prepared by hydrogenation reaction of butadiene-acrylonitrile copolymer, wherein the mass of acrylonitrile is 20% of the total mass of the butadiene-acrylonitrile copolymer.
The filler adopts graphite and bentonite.
The cure system for the curative comprises a peroxide cure system comprising dicumyl peroxide and 2, 5-dimethyl-2, 5 di-t-butylperoxyhexane.
The auxiliary agent comprises an anti-aging agent; the antioxidant comprises antioxidant OD.
The thermoplastic elastomer layer is made of polystyrene thermoplastic elastomer.
Comparative example 1
Based on example 1, the difference is only that: comparative example 1 did not contain a thermoplastic elastomer layer.
Comparative example 2
Based on example 1, the difference is only that: in comparative example 2 the thermoplastic elastomer layer was replaced with an engineering plastic layer.
In order to verify the performance of the product of the invention, 100 parallel products were manufactured for each example according to the preparation methods of examples 1 to 3 and comparative examples 1 to 2, and the manufactured diaphragms were subjected to yield loss tests, wherein the yield loss of the diaphragms mainly includes yield loss caused by the adhesive film, yield loss in the turnaround process, and yield loss in the assembly process, and the test results are shown in table 1.
It should be noted that the yield loss caused by the adhesive film means that in the forming process of the vibrating diaphragm, the vibrating diaphragm is difficult to take the film due to the fact that the vibrating diaphragm is tightly attached to the mold, and the yield loss of the product is caused by the stretching deformation in the demolding process of the vibrating diaphragm.
Turnover process yield loss means the vibrating diaphragm drawing of patterns back, at the transfer vibrating diaphragm in-process, because the vibrating diaphragm atress contact produces the yield loss that the deformation that can not resume caused the product.
The yield loss in the assembling process refers to the yield loss of products caused by the difficulty in positioning in the process of assembling the vibrating diaphragm to the sound generating device.
TABLE 1
| Mucosa-caused yield loss% | Turnover process yield loss/%) | Yield loss of assembly process% | Production yield% | |
| Example 1 | 1 | 1 | 1 | 97 |
| Example 2 | 1 | 0 | 1 | 98 |
| Example 3 | 1 | 1 | 1 | 97 |
| Comparative example 1 | 10 | 1 | 3 | 86 |
| Comparative example 2 | 1 | 5 | 1 | 93 |
As can be seen from Table 1, the single-layer rubber diaphragm in the comparative example 1 is tightly attached to the die head, so that the diaphragm is easy to stretch and deform in the mold removal process, and certain yield loss is caused. Compared with the prior art, the nitrile rubber and engineering plastic composite film in the comparative example 2 has high modulus at normal temperature, small elongation at break and poor rebound resilience, and when the vibrating diaphragm deforms under external force, creases are easily generated, so that the turnover yield loss is large; the nitrile rubber/hydrogenated butyronitrile and thermoplastic elastomer composite film has rebound elasticity and rigidity, and the production yield is optimal.
To verify the performance of the product of the present invention, total harmonic distortion test curves of the diaphragms in the embodiment 1 and the comparative example 1 are tested, and specific results are shown in fig. 3, where fig. 3 is a total harmonic distortion test curve of the diaphragm provided in the embodiment 1 of the present invention and the diaphragm in the comparative example 1, a dotted line is a total harmonic distortion test curve of the diaphragm provided in the comparative example 1, and a solid line is a total harmonic distortion test curve of the diaphragm in the embodiment 1. As can be seen from fig. 3, the diaphragm of example 1 of the present invention has a lower THD (total harmonic distortion) than the diaphragm of comparative example 1. This shows that the diaphragm of embodiment 1 of the present invention has better polarization resistance and better sound quality.
In order to verify the performance of the product of the present invention, the test curves (SPL curves) of the loudness of the diaphragms in example 1 and comparative example 1 at different frequencies were tested, with the frequency (Hz) on the abscissa and the loudness on the ordinate. Specific results referring to fig. 4, fig. 4 is a test curve of loudness of the diaphragm of example 1 of the present invention at different frequencies from the diaphragm of comparative example 1, the dotted line is the test curve of loudness of the diaphragm of example 1 at different frequencies, and the solid line is the test curve of loudness of the diaphragm of comparative example 1 at different frequencies.
The above-mentioned embodiments only express the embodiments of the present invention, and the description is more specific and detailed, but not understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by using the equivalent substitution or the equivalent transformation should fall within the protection scope of the present invention.
Claims (11)
1. The composite diaphragm of the sound production device is characterized by comprising at least one thermoplastic elastomer layer and at least one rubber layer, wherein the rubber layer is made of rubber compound; the rubber compound is obtained by mixing raw rubber and filler-containing raw materials, wherein the raw rubber comprises at least one of nitrile rubber and hydrogenated nitrile rubber, and the content of the raw rubber is 40-96% of the total amount of the rubber compound.
2. The composite diaphragm of the sounding device according to claim 1, wherein the nitrile rubber is made of butadiene-acrylonitrile copolymer, wherein the mass of acrylonitrile is 18-50% of the total mass of the butadiene-acrylonitrile copolymer; the hydrogenated nitrile rubber is prepared by hydrogenation reaction of a butadiene-acrylonitrile copolymer, wherein the mass of acrylonitrile is 18-50% of the total mass of the butadiene-acrylonitrile copolymer.
3. The composite diaphragm of claim 1, wherein the filler is at least one of a carbon material, silica, silicate, carbonate, and sulfate; the mass of the filler is 1-45% of the total mass of the rubber compound.
4. The composite diaphragm of the sound production device as claimed in claim 1, wherein the raw material of the rubber compound further includes a vulcanizing agent, and a vulcanizing system of the vulcanizing agent includes at least one of a sulfur vulcanizing system, a sulfur-free vulcanizing system, a peroxide vulcanizing system, and a resin vulcanizing system; the mass of the vulcanizing agent is 0.5-5% of the total mass of the rubber compound.
5. The composite diaphragm of the sound production device as claimed in claim 1, wherein the raw material of the rubber compound further includes an auxiliary agent, and the auxiliary agent includes at least one of a vulcanization accelerator, an anti-aging agent, a plasticizer, and a coloring agent; the content of the auxiliary agent is 2-15% of the total amount of the rubber compound.
6. The composite diaphragm of the sound production device as claimed in claim 1, wherein the hardness of the rubber layer is 25-85A, the room temperature storage modulus of the rubber layer is 2-35 MPa, and the loss factor of the rubber layer at room temperature is 0.1-1.
7. The composite diaphragm of claim 1, wherein the thermoplastic elastomer layer is made of at least one of a polyester-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, a polyamide-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, a polyvinyl chloride-based thermoplastic elastomer, a PE/EPDM dynamically vulcanized elastomer, a PP/EPDM dynamically vulcanized elastomer, and a natural rubber/PP dynamically vulcanized elastomer.
8. The method for preparing a composite diaphragm of a sound generating apparatus according to any one of claims 1 to 7, comprising the steps of:
compounding the thermoplastic elastomer layer and the rubber layer together to form a composite film;
and forming the composite membrane to form the composite diaphragm.
9. The method for preparing the composite diaphragm of the sound generating device as claimed in claim 8, wherein the method for preparing the rubber layer comprises the following steps: preparing a membrane body through a coating process, and drying the membrane body at low temperature to form an uncrosslinked rubber layer or a semi-crosslinked rubber layer; or the membrane body is made by a calendaring process, and the membrane body is an uncrosslinked rubber layer.
10. The method for preparing a composite diaphragm of a sound generating apparatus according to claim 8, wherein the molding process is air pressure molding or compression molding.
11. A sound-emitting device, characterized in that it comprises a composite diaphragm according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010788.6A CN111935625B (en) | 2020-09-23 | 2020-09-23 | Composite diaphragm of sound production device, preparation method of composite diaphragm and sound production device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010788.6A CN111935625B (en) | 2020-09-23 | 2020-09-23 | Composite diaphragm of sound production device, preparation method of composite diaphragm and sound production device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111935625A true CN111935625A (en) | 2020-11-13 |
| CN111935625B CN111935625B (en) | 2021-01-22 |
Family
ID=73334068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011010788.6A Active CN111935625B (en) | 2020-09-23 | 2020-09-23 | Composite diaphragm of sound production device, preparation method of composite diaphragm and sound production device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111935625B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021135870A1 (en) * | 2019-12-31 | 2021-07-08 | 歌尔股份有限公司 | Diaphragm and speaker |
| CN113773533A (en) * | 2021-08-31 | 2021-12-10 | 歌尔股份有限公司 | Vibrating diaphragm of sound generating device and sound generating device thereof |
| CN114071328A (en) * | 2021-10-29 | 2022-02-18 | 歌尔股份有限公司 | Sound generating device's vibrating diaphragm and sound generating device |
| WO2022062816A1 (en) * | 2020-09-23 | 2022-03-31 | 歌尔股份有限公司 | Diaphragm and sound generating apparatus |
| CN114827872A (en) * | 2021-01-29 | 2022-07-29 | 歌尔股份有限公司 | Vibrating diaphragm and sound generating device |
| WO2022160690A1 (en) * | 2021-01-29 | 2022-08-04 | 歌尔股份有限公司 | Diaphragm and sound producing device |
| WO2022262559A1 (en) * | 2021-06-18 | 2022-12-22 | 歌尔股份有限公司 | Diaphragm applicable to sound production device, preparation method thereof, and sound production device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080157631A1 (en) * | 2006-12-29 | 2008-07-03 | Artificial Muscle, Inc. | Electroactive polymer transducers biased for increased output |
| JP5483362B2 (en) * | 2010-12-13 | 2014-05-07 | 信越ポリマー株式会社 | Manufacturing method of speaker diaphragm film and speaker diaphragm film |
| CN106957466A (en) * | 2016-12-12 | 2017-07-18 | 瑞声科技(新加坡)有限公司 | Vibrating diaphragm for electroacoustics system and preparation method thereof |
| CN107849412A (en) * | 2015-08-11 | 2018-03-27 | 德莎欧洲股份公司 | Pressure-sensitive adhesive based on acrylonitrile butadiene rubber |
| CN207475849U (en) * | 2017-08-17 | 2018-06-08 | 歌尔科技有限公司 | For the composite diaphragm of sound-producing device |
| CN110267167A (en) * | 2019-06-14 | 2019-09-20 | 歌尔股份有限公司 | A kind of vibrating diaphragm and sounding device of sounding device |
| CN110708638A (en) * | 2019-10-31 | 2020-01-17 | 歌尔股份有限公司 | Vibrating diaphragm for miniature sound generating device and miniature sound generating device |
| CN111065024A (en) * | 2019-12-31 | 2020-04-24 | 歌尔科技有限公司 | Vibrating diaphragm and loudspeaker |
-
2020
- 2020-09-23 CN CN202011010788.6A patent/CN111935625B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080157631A1 (en) * | 2006-12-29 | 2008-07-03 | Artificial Muscle, Inc. | Electroactive polymer transducers biased for increased output |
| JP5483362B2 (en) * | 2010-12-13 | 2014-05-07 | 信越ポリマー株式会社 | Manufacturing method of speaker diaphragm film and speaker diaphragm film |
| CN107849412A (en) * | 2015-08-11 | 2018-03-27 | 德莎欧洲股份公司 | Pressure-sensitive adhesive based on acrylonitrile butadiene rubber |
| CN106957466A (en) * | 2016-12-12 | 2017-07-18 | 瑞声科技(新加坡)有限公司 | Vibrating diaphragm for electroacoustics system and preparation method thereof |
| CN207475849U (en) * | 2017-08-17 | 2018-06-08 | 歌尔科技有限公司 | For the composite diaphragm of sound-producing device |
| CN110267167A (en) * | 2019-06-14 | 2019-09-20 | 歌尔股份有限公司 | A kind of vibrating diaphragm and sounding device of sounding device |
| CN110708638A (en) * | 2019-10-31 | 2020-01-17 | 歌尔股份有限公司 | Vibrating diaphragm for miniature sound generating device and miniature sound generating device |
| CN111065024A (en) * | 2019-12-31 | 2020-04-24 | 歌尔科技有限公司 | Vibrating diaphragm and loudspeaker |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021135870A1 (en) * | 2019-12-31 | 2021-07-08 | 歌尔股份有限公司 | Diaphragm and speaker |
| WO2022062816A1 (en) * | 2020-09-23 | 2022-03-31 | 歌尔股份有限公司 | Diaphragm and sound generating apparatus |
| CN114827872A (en) * | 2021-01-29 | 2022-07-29 | 歌尔股份有限公司 | Vibrating diaphragm and sound generating device |
| WO2022160690A1 (en) * | 2021-01-29 | 2022-08-04 | 歌尔股份有限公司 | Diaphragm and sound producing device |
| WO2022262559A1 (en) * | 2021-06-18 | 2022-12-22 | 歌尔股份有限公司 | Diaphragm applicable to sound production device, preparation method thereof, and sound production device |
| CN113773533A (en) * | 2021-08-31 | 2021-12-10 | 歌尔股份有限公司 | Vibrating diaphragm of sound generating device and sound generating device thereof |
| CN113773533B (en) * | 2021-08-31 | 2023-12-22 | 歌尔股份有限公司 | Vibrating diaphragm of sound production device and sound production device thereof |
| CN114071328A (en) * | 2021-10-29 | 2022-02-18 | 歌尔股份有限公司 | Sound generating device's vibrating diaphragm and sound generating device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111935625B (en) | 2021-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111935625B (en) | Composite diaphragm of sound production device, preparation method of composite diaphragm and sound production device | |
| CN110708638B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device | |
| EP3985996A1 (en) | Vibration diaphragm of sound producing device and sound producing device | |
| CN111866669B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device | |
| KR102636232B1 (en) | Vibrating plate and sound generating device of sound generating device | |
| EP3985067A1 (en) | Diaphragm for sound generating device and sound generating device | |
| CN111935603B (en) | Composite diaphragm of sound production device, preparation method of composite diaphragm and sound production device | |
| CN110818991A (en) | Sound generating device's vibrating diaphragm and sound generating device | |
| CN110708636B (en) | Sound generating device's vibrating diaphragm and sound generating device | |
| CN110708637B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device | |
| CN111935605B (en) | Composite diaphragm of sound production device, preparation method of composite diaphragm and sound production device | |
| CN110708635B (en) | Sound generating device's vibrating diaphragm and sound generating device | |
| CN111866671B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device | |
| CN111866670B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device | |
| CN111849103B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device | |
| CN111923527A (en) | Composite diaphragm of loudspeaker, preparation method of composite diaphragm and loudspeaker | |
| CN110798779B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device | |
| CN111848994B (en) | Miniature sound generating device | |
| CN111923526A (en) | Composite diaphragm of loudspeaker, preparation method of composite diaphragm and loudspeaker | |
| CN116074700A (en) | Vibrating diaphragm of sound generating device and sound generating device | |
| CN111935606B (en) | Composite diaphragm, preparation method thereof and sound production device | |
| CN111849109B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device | |
| CN116074703A (en) | Vibrating diaphragm of sound generating device and sound generating device | |
| CN111935604B (en) | Vibrating diaphragm, preparation method thereof and sound production device | |
| CN111849110B (en) | Vibrating diaphragm for miniature sound generating device and miniature sound generating device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |