CN112211000A - Composite vibrating plate for loudspeaker and preparation method and application thereof - Google Patents

Composite vibrating plate for loudspeaker and preparation method and application thereof Download PDF

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Publication number
CN112211000A
CN112211000A CN202011065905.9A CN202011065905A CN112211000A CN 112211000 A CN112211000 A CN 112211000A CN 202011065905 A CN202011065905 A CN 202011065905A CN 112211000 A CN112211000 A CN 112211000A
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carbon fiber
layer
surface layer
resin
composite
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王世伟
陈进
司景航
黄汉雄
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Guoguang Electric Co Ltd
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Guoguang Electric Co Ltd
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    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/263—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/39—Aldehyde resins; Ketone resins; Polyacetals
    • D06M15/41—Phenol-aldehyde or phenol-ketone resins
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/693—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural or synthetic rubber, or derivatives thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a composite vibration plate for a loudspeaker and a preparation method and application thereof, wherein the composite vibration plate comprises a first surface layer, a first carbon fiber layer, a porous middle layer and a reinforcing layer which are sequentially arranged, and the reinforcing layer comprises a second carbon fiber layer and/or a second surface layer; the first surface layer and the second surface layer are metal layers. According to the invention, through screening of various materials with light and high-strength characteristics and special design of a hierarchical structure, the characteristics of low density, high strength and high modulus are endowed to the composite vibrating plate, the mechanical property of the material is obviously improved under the condition of no weight increment, and diversified appearances can be realized through a surface treatment process. The composite vibration plate is used as a vibration material of a loudspeaker, is particularly suitable for a flat panel loudspeaker, and can fully meet the performance requirements of the loudspeaker on high sensitivity and high cut-off frequency.

Description

Composite vibrating plate for loudspeaker and preparation method and application thereof
Technical Field
The invention belongs to the technical field of loudspeakers, and particularly relates to a composite vibrating plate for a loudspeaker and a preparation method and application thereof.
Background
A speaker is an important acoustic component in electronic equipment, used for performing conversion between an electric signal and a sound signal, and is an energy conversion device. The existing loudspeaker is mainly divided into three parts according to functions: a vibration part, a magnetic circuit part and a suspension part, wherein the vibration part comprises a vibration plate, a voice coil and the like. The material properties of the vibration part directly affect the stability of use, the life span, and the high and low frequency characteristics of sound of the speaker, and therefore, developing vibration materials with various properties is one of effective ways to improve the acoustic properties and use properties of the speaker.
CN204810540U discloses a micro speaker diaphragm, the diaphragm includes a dome and a folding ring, the dome includes the first layer, the second layer and the third layer that stack gradually, the first layer is one of an aluminum foil layer, a titanium alloy layer and a magnesium aluminum alloy layer, the second layer is a foamed polyester layer or a honeycomb foamed plate layer, the third layer is a graphite material layer or a polyimide layer. The micro loudspeaker diaphragm has high-frequency characteristics and reliability, but the strength of the material has a large promotion space.
CN109862482A discloses a dome material, a diaphragm and a speaker, wherein the dome material includes an intermediate layer, an adhesive layer, a film layer and a surface layer which are sequentially stacked; the middle layer is made of a foaming material, the surface layer is made of fiber prepreg comprising fibers and resin, and the fibers in the fiber prepreg are arranged in a unidirectional mode. The vibrating diaphragm and the loudspeaker containing the ball top material can improve the high-frequency cut-off frequency to 10KHz, but the fibers in the fiber layer have obvious orientation and are easy to crack in the direction with lower strength, so that the manufactured loudspeaker generates noise.
CN110677784A discloses a sound cone and a speaker using the sound cone, where the sound cone is made of a composite foam material, the composite foam material includes a foam core layer, the foam core layer includes a foam substrate layer and a surface layer disposed on at least one surface of the foam substrate layer, and the surface layer is made of parylene, polyp-chloro-p-xylene or poly-dichloro-p-xylene. The cone material has good acoustic performance, can not absorb water and moisture in a humid environment, but has low mechanical property, and the elastic modulus and the strength are difficult to meet higher performance requirements.
In recent years, flat panel speakers have been increasingly popular. Compared with the traditional sound equipment, the flat panel loudspeaker has the advantages of small vibration amplitude, extremely wide directivity, small distortion and better transient response. Because the flat sound source is the whole surface, and is not the point sound source of the traditional sound, the sound attenuation is slow, and the whole sound field is more uniform; moreover, the flat panel speaker can have a large area and a small thickness, meets the current requirements on lightness and thinness of electronic products, and has a wide development prospect. The vibration equation of the flat panel speaker follows the vibration equation of the thin plate, and the vibration plate material is required to have the characteristics of light weight and high strength. However, the vibrating plate disclosed in the prior art has a large lifting space in terms of strength; part of the vibrating plate achieves an improvement in rigidity by increasing the thickness, but also increases the mass of the vibrating plate, thereby affecting the high-frequency characteristics and sensitivity of the speaker.
Therefore, it is a research focus in the field to develop a vibrating plate with light weight, high strength and large modulus to meet the application requirements of high-performance flat panel speakers.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a composite vibration plate for a loudspeaker and a preparation method and application thereof, wherein the composite vibration plate has excellent rigidity and elastic modulus, small density and light weight and can meet the performance requirements of high sensitivity and high cut-off frequency of the loudspeaker through the material and structural design of a first surface layer, a first carbon fiber layer, a porous intermediate layer and a reinforcing layer.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a composite vibration plate for a speaker, the composite vibration plate comprising a first surface layer, a first carbon fiber layer, a porous intermediate layer and a reinforcement layer, which are sequentially arranged, wherein the reinforcement layer comprises a second carbon fiber layer and/or a second surface layer; the first surface layer and the second surface layer are metal layers.
The invention provides a composite vibration plate, which comprises a first surface layer, a first carbon fiber layer, a porous middle layer and a reinforcing layer which are sequentially stacked, wherein the reinforcing layer comprises any one or the combination of a second carbon fiber layer and a second surface layer, namely, the composite vibration plate specifically comprises three stacked structures: (1) the first surface layer, the first carbon fiber layer, the porous middle layer and the second carbon fiber layer are sequentially arranged; (2) the first surface layer, the first carbon fiber layer, the porous middle layer and the second surface layer are arranged in sequence; (3) the first surface layer, the first carbon fiber layer, the porous middle layer, the second carbon fiber layer and the second surface layer are arranged in sequence.
The porous intermediate layer contains a large number of pore structures and has extremely low density and high strength; the specific gravity of the first carbon fiber layer is small and is lower than one fourth of that of the steel material, and the first carbon fiber layer has excellent tensile strength and tensile elastic modulus, wherein the tensile strength is 7-9 times that of the steel material; the first surface layer is a metal layer, has light weight and high mechanical strength, is good in processing formability and is easy to prepare diversified appearances. According to the invention, through the selection of materials and the design of a hierarchical structure, the characteristics of low density, high strength and high modulus are endowed to the composite vibration plate, the mechanical property of the material is obviously improved under the condition of no weight increment, and the composite vibration plate can fully meet the requirements of high sensitivity, high frequency cut-off frequency, diversified appearance and the like of a loudspeaker.
Preferably, the materials of the first surface layer and the second surface layer each independently include aluminum, an aluminum alloy, a magnesium alloy, titanium or a titanium alloy, and further preferably an aluminum alloy.
Preferably, the magnesium alloy is a magnesium aluminum alloy.
In a preferred embodiment of the present invention, the first surface layer and the second surface layer are preferably made of aluminum alloy, and the aluminum alloy has a light weight, a high mechanical strength, easy processing, good formability, various appearance treatment methods, and high corrosion resistance. The aluminum alloy of the first surface layer can realize any desired color through powder or electrophoretic coating, including natural silver and colored anodic oxide films, and can meet the requirements of consumers on product appearance diversity.
Preferably, the thicknesses of the first surface layer and the second surface layer are respectively 30-50 μm, such as 31 μm, 33 μm, 35 μm, 37 μm, 39 μm, 40 μm, 41 μm, 43 μm, 45 μm, 47 μm or 49 μm, and the specific values therebetween are limited by space and for the sake of brevity, and the invention is not exhaustive.
Preferably, the first carbon fiber layer and the second carbon fiber layer each independently comprise at least one layer of carbon fiber composite material.
Preferably, the carbon fiber composite material comprises carbon fiber prepreg and/or carbon fiber woven cloth.
Preferably, the carbon fiber prepreg includes a resin, and carbon fibers dispersed in the resin; the dispersion includes a random dispersion or a dispersion in a single direction.
As a preferred technical scheme of the invention, the first carbon fiber layer and the second carbon fiber layer respectively and independently comprise at least one layer of carbon fiber composite material, the specific gravity of the carbon fiber composite material (CFRP) is lower than one fourth of that of a steel material (such as A3 steel), the tensile strength can reach more than 3500MPa and is 7-9 times of that of the steel material, and the tensile elastic modulus can reach 23-43 GPa and is also higher than that of the steel material; therefore, the specific strength (strength to density ratio) of the carbon fiber composite material can reach 2000 MPa-g-1·cm3Whereas the specific strength of A3 steel is only 59MPa g-1·cm3On the other hand, the specific modulus is higher than that of steel materials. The invention introduces at least one layer of high strength on at least one side of the porous intermediate layerThe strength and modulus of the composite vibration plate are obviously improved.
Preferably, the resin comprises any one of an epoxy resin, a phenolic resin, a polyamide resin or a polyimide resin or a combination of at least two thereof.
Preferably, the carbon fiber has a length of 6 to 12mm, such as 6.2mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.5mm, 7.8mm, 8mm, 8.2mm, 8.5mm, 8.8mm, 9mm, 9.2mm, 9.5mm, 9.8mm, 10mm, 10.2mm, 10.5mm, 10.8mm, 11mm, 11.2mm, 11.5mm, or 11.8mm, and specific point values therebetween are limited to space and are not exhaustive for the sake of brevity.
Preferably, the carbon fiber has a diameter of 5 to 10 μm, such as 5.2 μm, 5.5 μm, 5.8 μm, 6 μm, 6.2 μm, 6.5 μm, 6.8 μm, 7 μm, 7.2 μm, 7.5 μm, 7.8 μm, 8 μm, 8.2 μm, 8.5 μm, 8.8 μm, 9 μm, 9.2 μm, 9.5 μm, or 9.8 μm, and specific points therebetween are limited in space and for the sake of brevity, the present invention is not exhaustive of the specific points included in the range.
Preferably, the carbon fiber content in the carbon fiber composite material is 40-60% by mass, for example, 41%, 43%, 45%, 47%, 49%, 50%, 51%, 53%, 55%, 57% or 59%, and specific values therebetween are not exhaustive, and for brevity and clarity, the invention is not limited to the specific values included in the range.
As a preferred technical scheme, the mass percentage of the carbon fibers in the carbon fiber composite material is 40-60%; if the carbon fiber content is too high, the resin preimpregnation (also called sizing agent) can not completely cover the fibers, and the surface of the material can be fluffed; the resin is bonded with fibers in the matrix, a coherent system is formed after hot press molding, and if the content of the resin is low, the performance stability is not facilitated; if the content of the carbon fiber is too low, the strength of the carbon fiber composite material cannot meet the use requirement.
Preferably, the carbon fiber composite material is a carbon fiber prepreg comprising a resin, and carbon fibers randomly dispersed in the resin; the first carbon fiber layer and the second carbon fiber layer comprise at least 1 carbon fiber prepreg.
In a preferred embodiment of the present invention, the carbon fiber composite material is a carbon fiber prepreg, and carbon fibers in the carbon fiber prepreg are randomly (nondirectionally) dispersed in a resin, so that the first carbon fiber layer and the second carbon fiber layer have isotropy, which can prevent a phenomenon that a mechanical property of a speaker diaphragm is not uniformly distributed, and can prevent the diaphragm from easily cracking in a direction with low strength, so that sound quality of the speaker is more transparent and clear.
Preferably, the carbon fiber composite material is a carbon fiber prepreg comprising a resin and carbon fibers dispersed in the resin in a single direction; the first carbon fiber layer and the second carbon fiber layer comprise at least 2 layers of the carbon fiber prepreg, and the directions of carbon fibers in the carbon fiber prepreg in each layer are different from each other.
As another preferred technical scheme of the present invention, the carbon fiber composite material is a carbon fiber prepreg, and carbon fibers in the carbon fiber prepreg are dispersed in a resin along a single direction; the first carbon fiber layer and the second carbon fiber layer comprise at least 2 carbon fiber prepregs, and the directions of carbon fibers in the carbon fiber prepregs are different from each other (preferably 90-degree staggered), namely the carbon fibers in the first carbon fiber layer and the second carbon fiber layer are distributed in a staggered manner, so that the carbon fibers in the first carbon fiber layer and the second carbon fiber layer are distributed in a certain isotropic manner, and cracks are prevented from being easily generated on the loudspeaker vibration plate in the direction with lower strength.
Preferably, the first carbon fiber layer and the second carbon fiber layer each independently have a thickness of 30 to 100 μm, such as 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, or 95 μm, and specific point values therebetween are not exhaustive, and the invention is not limited to the specific point values included in the range for brevity and conciseness.
Preference is given toThe density of the porous middle layer is 0.02-0.6 g/cm3E.g. 0.05g/cm3、0.1g/cm3、0.15g/cm3、0.2g/cm3、0.25g/cm3、0.3g/cm3、0.35g/cm3、0.4g/cm3、0.45g/cm3、0.5g/cm3、0.55g/cm3Or 0.58g/cm3And the specific values between the foregoing, are not intended to be exhaustive or to limit the invention to the precise values encompassed within the scope, for reasons of brevity and clarity.
Preferably, the thickness of the porous intermediate layer is 500 to 1200 μm, such as 550 μm, 600 μm, 650 μm, 700 μm, 750 μm, 800 μm, 850 μm, 900 μm, 950 μm, 1000 μm, 1050 μm, 1100 μm or 1150 μm, and the specific values therebetween are not exhaustive, and for reasons of brevity and brevity, the invention is not intended to be exhaustive of the specific values included in the scope.
Preferably, the material of the porous intermediate layer comprises a honeycomb core material, a foam material or balsa wood.
As a preferable embodiment of the present invention, the material of the porous intermediate layer includes a honeycomb core material, a foam material (a foaming material), or balsa, which has a low density and a certain strength, and can provide the composite vibration plate with a certain thickness and reduce the weight of the entire vibration plate as much as possible.
Preferably, the honeycomb core material comprises an aramid honeycomb core or a nylon honeycomb core.
Preferably, the density of the honeycomb core material is 0.02-0.2 g/cm3E.g. 0.05g/cm3、0.08g/cm3、0.1g/cm3、0.11g/cm3、0.13g/cm3、0.15g/cm3、0.17g/cm3Or 0.19g/cm3And the specific values between the foregoing, are not intended to be exhaustive or to limit the invention to the precise values encompassed within the scope, for reasons of brevity and clarity.
Preferably, the foam material comprises polymethacrylimide foam (PMI foam), polyimide foam or polyester foam.
Preferably, the density of the polymethacrylimide foam is 0.03-0.32 g/cm3E.g. 0.05g/cm3、0.07g/cm3、0.09g/cm3、0.1g/cm3、0.11g/cm3、0.13g/cm3、0.15g/cm3、0.17g/cm3、0.19g/cm3、0.2g/cm3、0.22g/cm3、0.25g/cm3、0.28g/cm3、0.3g/cm3Or 0.31g/cm3And the specific values between the foregoing, are not intended to be exhaustive or to limit the invention to the precise values encompassed within the scope, for reasons of brevity and clarity.
Preferably, the density of the balsa wood is 0.05-0.15 g/cm3E.g. 0.07g/cm3、0.09g/cm3、0.1g/cm3、0.11g/cm3、0.12g/cm3、0.13g/cm3Or 0.14g/cm3And the specific values between the foregoing, are not intended to be exhaustive or to limit the invention to the precise values encompassed within the scope, for reasons of brevity and clarity.
Preferably, the first surface layer, the first carbon fiber layer, the porous intermediate layer and the reinforcing layer are connected through bonding layers.
Preferably, the thickness of the adhesive layers is 8 to 30 μm, such as 8.2 μm, 8.5 μm, 8.8 μm, 9 μm, 9.2 μm, 9.5 μm, 9.8 μm, 10 μm, 10.5 μm, 11 μm, 11.5 μm, 12 μm, 12.5 μm, 13 μm, 13.5 μm, 14 μm, 14.5 μm, 15 μm, 16 μm, 18 μm, 20 μm, 21 μm, 23 μm, 25 μm, 27 μm, or 29 μm, and the specific values therebetween are not limited to space and for the sake of brevity, and the invention does not exhaust the specific values included in the range, and is further preferably 9 to 11 μm.
Preferably, the materials of the adhesive layers each independently include any one of epoxy resin, phenolic resin, acrylic resin, or silicone resin, or a combination of at least two thereof.
Preferably, the composite vibration plate comprises a first surface layer, a first carbon fiber layer, a porous intermediate layer, a second carbon fiber layer and a second surface layer which are arranged in sequence; the first surface layer and the second surface layer are aluminum alloy layers; the first carbon fiber layer and the second carbon fiber layer respectively and independently comprise at least one layer of carbon fiber composite material, the carbon fiber composite material comprises resin and carbon fibers randomly dispersed in the resin.
In another aspect, the present invention provides a method of manufacturing a composite vibration plate as described above, the method including: sequentially bonding the first surface layer, the first carbon fiber layer, the porous intermediate layer and the reinforcing layer through an adhesive to obtain the composite vibrating plate; the reinforcement layer comprises a second carbon fibre layer and/or a second surface layer.
Preferably, the adhesive comprises any one of or a combination of at least two of epoxy resin adhesive, phenolic resin adhesive, acrylic resin adhesive or silica gel.
Preferably, the first fiber layer comprises at least one layer of carbon fiber composite material, and the carbon fiber composite material comprises carbon fiber prepreg and/or carbon fiber woven cloth.
Preferably, the method for preparing the carbon fiber prepreg comprises the following steps: and dispersing carbon fibers in resin, and carrying out hot pressing to obtain the carbon fiber composite material.
Preferably, the dispersion comprises a random dispersion or a dispersion in a single direction.
Preferably, the surface treatment process of the first surface layer and the second surface layer independently comprises spraying or anodizing.
In another aspect, the present invention provides a speaker including the composite vibration plate as described above.
Preferably, the speaker is a flat panel speaker, and a cone of the flat panel speaker includes the composite vibration plate.
The composite vibrating plate is particularly suitable for being used as a cone material of a flat panel loudspeaker, and the sound source of the flat panel loudspeaker is the whole surface, rather than a point sound source of the traditional sound, so that the sound attenuation is slow, and the whole sound field is more uniform; furthermore, the flat panel speaker can be made large in area and small in thickness. The vibration equation of the flat panel loudspeaker follows the vibration equation of the thin plate, and the vibration plate material is required to have the characteristics of light weight and high strength; the composite vibration plate has the characteristics of light weight, high strength and high modulus through the selection of materials and the design of a hierarchical structure, and can fully meet the performance requirements of a flat panel loudspeaker.
The GGEC FFC23 × 90 type loudspeaker made of the composite vibrating plate has the sensitivity of 84-86.5 dB/m and the cutoff frequency of 18.2-22.2 KHz, and can meet the performance requirements of high sensitivity and cutoff frequency.
Compared with the prior art, the invention has the following beneficial effects:
the composite vibrating plate provided by the invention comprises the first surface layer, the first carbon fiber layer, the porous middle layer and the reinforcing layer which are sequentially arranged, and various materials with light and high-strength characteristics are screened, and the special design of a hierarchical structure is adopted, so that the characteristics of low density, high strength and high modulus are given to the composite vibrating plate, the mechanical property of the material is obviously improved under the condition of no weight increment, and diversified appearances can be realized through a surface treatment process. The density of the composite vibrating plate is as low as 0.3-1.02 g/cm3The elastic modulus reaches 16.5-52.5 GPa, the tensile strength is 325-755.3 MPa, and the composite material has light weight and excellent mechanical property. The composite vibration plate is used as a vibration material of a loudspeaker, is particularly suitable for a flat panel loudspeaker, and can fully meet the performance requirements of the loudspeaker on high sensitivity and high cut-off frequency.
Drawings
FIG. 1 is a schematic structural diagram of a composite vibrating plate provided in embodiments 1 to 6;
fig. 2 is a schematic structural view of a composite vibration plate provided in embodiment 7;
fig. 3 is a schematic structural view of a composite vibration plate provided in embodiment 8;
the composite material comprises 1-a first surface layer, 2-a first carbon fiber layer, 3-a porous middle layer, 4-a reinforcing layer, 41-a second carbon fiber layer and 42-a second surface layer.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a composite vibration plate for a loudspeaker, which comprises a first surface layer, a first carbon fiber layer, a porous middle layer and a reinforcing layer, wherein the first surface layer, the first carbon fiber layer, the porous middle layer and the reinforcing layer are sequentially arranged; the structure diagram is shown in figure 1, wherein 1 is a first surface layer, 2 is a first carbon fiber layer, 3 is a porous middle layer, 4 is a reinforcing layer, 41 is a second carbon fiber layer, and 42 is a second surface layer.
The method specifically comprises the following steps:
(1) the first surface layer and the second surface layer are anodic aluminum alloy oxide layers, and the thickness of the first surface layer and the thickness of the second surface layer are both 30 micrometers;
(2) the first carbon fiber layer and the second carbon fiber layer are made of carbon fiber composite materials, and the thicknesses of the first carbon fiber layer and the second carbon fiber layer are both 30 micrometers; the carbon fiber composite material is a carbon fiber prepreg and comprises epoxy resin (the trade name is HS835A, purchased from Panyu Heyu Hengyu company) and chopped carbon fibers (the length is 6-12 mm, the average diameter is 7 mu m) randomly dispersed in the epoxy resin, the mass percentage content of the carbon fibers in the carbon fiber composite material is 55%, and the carbon fiber composite material is obtained by randomly dispersing the carbon fibers in the epoxy resin and carrying out hot pressing;
(3) the porous intermediate layer is PMI foam with the thickness of 1200 mu m and the density of 0.11g/cm3；
(4) The first carbon fiber layer, the porous intermediate layer and the second carbon fiber layer are connected through an epoxy resin adhesive (the trade name is HS835B, purchased from Panyu Heyu Hengyu company) with the thickness of 9 μm; the first surface layer and the first carbon fiber layer, and the second surface layer and the second carbon fiber layer were connected by an acrylic resin adhesive (No. HS750L, available from the company isopyu, constant sound) having a thickness of 9 μm.
The preparation method of the composite vibration plate comprises the following steps:
(1) randomly dispersing the chopped carbon fibers in epoxy resin, soaking and mixing, and then placing the mixture at 150 ℃ and under the pressure of 1MPa for hot pressing for 20s to obtain a carbon fiber composite material;
(2) sequentially overlapping the carbon fiber composite material obtained in the step (1), acrylic glue and an aluminum foil, and rolling and laminating at 80 ℃ and under the pressure of 0.2MPa to obtain a carbon fiber aluminum foil composite sheet;
(3) and (3) sequentially superposing the carbon fiber aluminum foil composite sheet, the epoxy resin adhesive, the PMI foam and the carbon fiber aluminum foil composite sheet, hot-pressing and laminating for 10min at the temperature of 150 ℃ and under the pressure of 1MPa, cooling to 30 ℃, opening the die, taking out, and cutting the shape to obtain the composite vibrating plate.
Example 2
The present embodiment provides a composite vibration plate for a speaker, which has a schematic structural view as shown in fig. 1, and includes a first surface layer 1, a first carbon fiber layer 2, a porous intermediate layer 3, and a reinforcing layer 4, which are sequentially disposed, wherein the reinforcing layer 4 includes a second carbon fiber layer 41 and a second surface layer 42.
The method specifically comprises the following steps:
(1) the first surface layer and the second surface layer are anodic aluminum alloy oxide layers, and the thickness of the first surface layer and the thickness of the second surface layer are both 40 micrometers;
(2) the first carbon fiber layer and the second carbon fiber layer are made of carbon fiber composite materials, and the thicknesses of the first carbon fiber layer and the second carbon fiber layer are both 50 micrometers; the carbon fiber composite material is a carbon fiber prepreg and comprises epoxy resin (the mark is SK138 and is purchased from Changsha Shenli company in Hunan province) and chopped carbon fibers (the length is 6-12 mm and the average diameter is 7 mu m) randomly dispersed in the epoxy resin, the mass percentage content of the carbon fibers in the carbon fiber composite material is 55 percent, and the carbon fiber composite material is obtained by randomly dispersing the carbon fibers in the epoxy resin and carrying out hot pressing;
(3) the porous intermediate layer is PMI foam with the thickness of 1000 μm and the density of 0.17g/cm3；
(4) The first carbon fiber layer, the porous middle layer and the second carbon fiber layer are connected through an epoxy resin adhesive with the thickness of 9 mu m; the first surface layer and the first carbon fiber layer, and the second surface layer and the second carbon fiber layer are connected through a phenolic resin adhesive (KT-36208, available from Kunzyi company, New society of Guangdong) with the thickness of 9 μm.
The composite vibration plate was prepared in the same manner as in example 1.
Example 3
The present embodiment provides a composite vibration plate for a speaker, which has a schematic structural view as shown in fig. 1, and includes a first surface layer 1, a first carbon fiber layer 2, a porous intermediate layer 3, and a reinforcing layer 4, which are sequentially disposed, wherein the reinforcing layer 4 includes a second carbon fiber layer 41 and a second surface layer 42.
The method specifically comprises the following steps:
(1) the first surface layer and the second surface layer are sprayed aluminum alloy layers, and the thickness of the first surface layer and the thickness of the second surface layer are both 50 micrometers;
(2) the first carbon fiber layer and the second carbon fiber layer are made of carbon fiber composite materials, and the thicknesses of the first carbon fiber layer and the second carbon fiber layer are both 100 micrometers; the carbon fiber composite material is a carbon fiber prepreg and comprises epoxy resin (with the brand number being DP100A and purchased from 3M company in Guangdong, Guangdong province) and chopped carbon fibers (with the length being 6-12 mm and the average diameter being 7 mu M) randomly dispersed in the epoxy resin, wherein the mass percentage content of the carbon fibers in the carbon fiber composite material is 55%, and the carbon fiber composite material is obtained by randomly dispersing the carbon fibers in the epoxy resin and carrying out hot pressing;
(3) the porous intermediate layer is PMI foam with a thickness of 600 μm and a density of 0.205g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous middle layer, the second carbon fiber layer and the second surface layer are connected through epoxy resin adhesives with the thickness of 10 mu m.
The composite vibration plate was prepared in the same manner as in example 1.
Example 4
The present embodiment provides a composite vibration plate for a speaker, which has a schematic structural view as shown in fig. 1, and includes a first surface layer 1, a first carbon fiber layer 2, a porous intermediate layer 3, and a reinforcing layer 4, which are sequentially disposed, wherein the reinforcing layer 4 includes a second carbon fiber layer 41 and a second surface layer 42.
The method specifically comprises the following steps:
(1) the first surface layer and the second surface layer are anodic aluminum alloy oxide layers, and the thickness of the first surface layer and the thickness of the second surface layer are both 30 micrometers;
(2) the first carbon fiber layer and the second carbon fiber layer are made of carbon fiber composite materials, and the thicknesses of the first carbon fiber layer and the second carbon fiber layer are both 80 micrometers; the carbon fiber composite material is a carbon fiber prepreg and comprises epoxy resin (the trade name is HS835A, purchased from Panyu Heyu Hengyu company) and chopped carbon fibers (the length is 6-12 mm, the average diameter is 7 mu m) randomly dispersed in the epoxy resin, the mass percentage content of the carbon fibers in the carbon fiber composite material is 55%, and the carbon fiber composite material is obtained by randomly dispersing the carbon fibers in the epoxy resin and carrying out hot pressing;
(3) the porous intermediate layer is made of Barsha wood with thickness of 900 μm and density of 0.08g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous middle layer, the second carbon fiber layer and the second surface layer are connected through an acrylic resin adhesive with the thickness of 11 mu m.
The composite vibration plate was prepared in the same manner as in example 1.
Example 5
The present embodiment provides a composite vibration plate for a speaker, which has a schematic structural view as shown in fig. 1, and includes a first surface layer 1, a first carbon fiber layer 2, a porous intermediate layer 3, and a reinforcing layer 4, which are sequentially disposed, wherein the reinforcing layer 4 includes a second carbon fiber layer 41 and a second surface layer 42.
The method specifically comprises the following steps:
(1) the first surface layer and the second surface layer are sprayed aluminum alloy layers, and the thickness of the first surface layer and the thickness of the second surface layer are both 30 micrometers;
(2) the first carbon fiber layer and the second carbon fiber layer are made of carbon fiber composite materials, and the thicknesses of the first carbon fiber layer and the second carbon fiber layer are both 100 micrometers; the carbon fiber composite material is a carbon fiber prepreg and comprises epoxy resin (the trade name is HS835A, purchased from Panyu Heyu Hengyu company) and chopped carbon fibers (the length is 6-12 mm, the average diameter is 7 mu m) randomly dispersed in the epoxy resin, the mass percentage content of the carbon fibers in the carbon fiber composite material is 55%, and the carbon fiber composite material is obtained by randomly dispersing the carbon fibers in the epoxy resin and carrying out hot pressing;
(3) the porous middle layer is a nylon honeycomb core with the thickness of 1200 mu m and the density of 0.024g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous middle layer, the second carbon fiber layer and the second surface layer are connected through epoxy resin adhesives with the thickness of 11 mu m.
The composite vibration plate was prepared in the same manner as in example 1.
Example 6
The present embodiment provides a composite vibration plate for a speaker, which has a schematic structural view as shown in fig. 1, and includes a first surface layer 1, a first carbon fiber layer 2, a porous intermediate layer 3, and a reinforcing layer 4, which are sequentially disposed, wherein the reinforcing layer 4 includes a second carbon fiber layer 41 and a second surface layer 42.
The method specifically comprises the following steps:
(1) the first surface layer and the second surface layer are anodic aluminum alloy oxide layers, and the thickness of the first surface layer and the thickness of the second surface layer are both 30 micrometers;
(2) the first carbon fiber layer and the second carbon fiber layer are made of carbon fiber composite materials, and the thicknesses of the first carbon fiber layer and the second carbon fiber layer are both 80 micrometers; the carbon fiber composite material is a carbon fiber prepreg and comprises epoxy resin (the trade name is HS835A, purchased from Panyu Heyu Hengyu company) and chopped carbon fibers (the length is 6-12 mm, the average diameter is 7 mu m) randomly dispersed in the epoxy resin, the mass percentage content of the carbon fibers in the carbon fiber composite material is 55%, and the carbon fiber composite material is obtained by randomly dispersing the carbon fibers in the epoxy resin and carrying out hot pressing;
(3) the porous middle layer is aramid fiber honeycomb core with thickness of 1200 μm and density of 0.04g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous middle layer, the second carbon fiber layer and the second surface layer are connected through epoxy resin adhesives with the thickness of 10 mu m.
The composite vibration plate was prepared in the same manner as in example 1.
Example 7
The present embodiment provides a composite vibration plate for a speaker, which has a schematic structural view as shown in fig. 2, and includes a first surface layer 1, a first carbon fiber layer 2, a porous intermediate layer 3, and a second carbon fiber layer 41, where the second carbon fiber layer 41 is a reinforcing layer, which are sequentially disposed.
The method specifically comprises the following steps:
(1) the first surface layer is an anodic aluminum alloy oxide layer with the thickness of 40 mu m;
(2) the first carbon fiber layer and the second carbon fiber layer are made of carbon fiber composite materials, and the thicknesses of the first carbon fiber layer and the second carbon fiber layer are both 70 micrometers; the carbon fiber composite material is a carbon fiber prepreg and comprises epoxy resin (the trade name is HS835A, purchased from Panyu Heyu Hengyu company) and chopped carbon fibers (the length is 6-12 mm, the average diameter is 7 mu m) randomly dispersed in the epoxy resin, the mass percentage content of the carbon fibers in the carbon fiber composite material is 40%, and the carbon fiber composite material is obtained by randomly dispersing the carbon fibers in the epoxy resin and carrying out hot pressing;
(3) the porous intermediate layer is PMI foam with the thickness of 900 mu m and the density of 0.17g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous middle layer and the second carbon fiber layer are connected through epoxy resin adhesive with the thickness of 12 mu m.
The composite vibration plate was prepared in the same manner as in example 1.
Example 8
The present embodiment provides a composite vibration plate for a speaker, which has a schematic structural view as shown in fig. 3, and includes a first surface layer 1, a first carbon fiber layer 2, a porous intermediate layer 3, and a second surface layer 42, i.e., a reinforcing layer, which are sequentially disposed.
The method specifically comprises the following steps:
(1) the first surface layer and the second surface layer are both anodic aluminum alloy layers, and the thickness of the first surface layer and the second surface layer is 40 mu m;
(2) the first carbon fiber layer is made of carbon fiber composite materials, and the thickness of the first carbon fiber layer is 80 micrometers; the carbon fiber composite material is a carbon fiber prepreg and comprises epoxy resin (the trade name is HS835A, purchased from Panyu Heyu Hengyu company) and chopped carbon fibers (the length is 6-12 mm, the average diameter is 7 mu m) randomly dispersed in the epoxy resin, the mass percentage content of the carbon fibers in the carbon fiber composite material is 50%, and the carbon fiber composite material is obtained by randomly dispersing the carbon fibers in the epoxy resin and carrying out hot pressing;
(3) the porous middle layer is aramid fiber honeycomb core with thickness of 1000 μm and density of 0.04g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous middle layer and the second surface layer are connected through epoxy resin adhesives with the thickness of 10 mu m.
The composite vibration plate was prepared in the same manner as in example 1.
Example 9
This embodiment provides a composite vibration plate for a speaker, which is different from embodiment 1 only in that the first carbon fiber layer and the second carbon fiber layer each have a thickness of 60 μm and are each composed of 2 layers of carbon fiber prepreg; the carbon fiber prepreg comprises epoxy resin (the trade name is HS835A, purchased from Panyu Heyu company) and carbon fibers dispersed in the epoxy resin along a single direction; the carbon fiber directions of the 2 layers of carbon fiber prepregs in the first carbon fiber layer are mutually vertical; the carbon fiber directions of the 2 carbon fiber prepregs in the second carbon fiber layer are mutually perpendicular. The other hierarchical structures and materials were the same as in example 1.
Example 10
This example provides a composite vibration plate for a speaker, which is different from example 1 only in that the first carbon fiber layer and the second carbon fiber layer are each a carbon fiber woven cloth having a thickness of 50 μm (designation C6442, available from changtou roughcast company, sich). The other hierarchical structures and materials were the same as in example 1.
Comparative example 1
This comparative example provides a composite vibration plate for a speaker, which is different from example 1 only in that the first carbon fiber layer and the second carbon fiber layer are single-layered carbon fiber composite materials, which are carbon fiber prepregs in which carbon fibers are arranged in a single direction; the other hierarchical structures and material compositions were the same as in example 1.
Comparative example 2
This comparative example provides a composite vibration plate for a speaker, which differs from example 1 only in that the first carbon fiber layer and the second carbon fiber layer are not contained; namely, the composite vibration plate comprises a first surface layer, a porous intermediate layer and a second surface layer which are arranged in sequence; the other layer thicknesses and material compositions were the same as in example 1.
Comparative example 3
This comparative example provides a composite vibration plate for a speaker, which differs from example 1 only in that the first surface layer and the second surface layer are not contained; namely, the composite vibration plate comprises a first carbon fiber layer, a porous intermediate layer and a second carbon fiber layer which are sequentially arranged; the other layer thicknesses and material compositions were the same as in example 1.
Comparative example 4
This comparative example provides a composite vibration plate for a speaker, which differs from example 1 only in that the first carbon fiber layer and the second surface layer are not contained; namely, the composite vibration plate comprises a first surface layer, a porous intermediate layer and a second carbon fiber layer which are arranged in sequence; the other layer thicknesses and material compositions were the same as in example 1.
Comparative example 5
This comparative example provides a composite vibration plate for a speaker, which is different from example 1 only in that the first surface layer and the second surface layer are both polyimide (NX 10 of SKC corporation, korea) layers having a thickness of 30 μm; the other layer thicknesses and material compositions were the same as in example 1.
And (3) performance testing:
(1) density: weighing mass by using an electronic balance, measuring and calculating volume by using a micrometer, and calculating to obtain density according to the ratio of the mass to the volume;
(2) modulus of elasticity: testing according to a three-point bending method in the national standard GB/T14452-1993 metal bending mechanical property test method, wherein a test instrument is an HD-513A-S tester of Dongguan Haidan International Instrument Co., Ltd;
(3) tensile strength: the test is carried out according to the method in the national standard GB/T1040-;
(4) frequency response curve (sensitivity, cut-off frequency): the composite vibrating plates to be tested are assembled into GGEC FFC23 × 90 type speakers to be measured according to the national standard GB/T12060-5-2011 and the standard IEC60268-5, and the test instrument is a USA Listen INC Soundcheck test system.
The performance test was performed on the composite vibration plates provided in examples 1 to 10 and comparative examples 1 to 5 according to the above test method, and the results are shown in table 1.
TABLE 1
Figure BDA0002713750160000181
As can be seen from the data in Table 1, the composite vibration plate provided by the present invention has low density, high modulus and high resistanceThe tensile strength is as low as 0.3 to 1.02g/cm3The elastic modulus can reach 16.5-52.5 GPa, the tensile strength can reach 325-755.3 MPa, and the preparation method is used for preparing a loudspeaker cone, is favorable for improving the sensitivity of the loudspeaker, widening the frequency response curve of the loudspeaker, inhibiting the segmentation vibration in the working process of the cone, and can avoid the fracture failure of the loudspeaker in the working process so as to ensure the reliability.
The GGEC FFC23 × 90 type loudspeaker made of the composite vibrating plate has the sensitivity of 84-86.5 dB/m and the cutoff frequency of 18.2-22.2 KHz, and can meet the performance requirements of high sensitivity and cutoff frequency.
The applicant states that the present invention is illustrated by the above embodiments of a composite vibration plate for a speaker and a method for manufacturing the same and application thereof, but the present invention is not limited to the above process steps, i.e., it does not mean that the present invention must be implemented depending on the above process steps. It will be apparent to those skilled in the art that any modification of the present invention, equivalent substitutions of selected materials and additions of auxiliary components, selection of specific modes and the like, which are within the scope and disclosure of the present invention, are contemplated by the present invention.

Claims (10)

1. A composite vibration plate for a loudspeaker is characterized by comprising a first surface layer, a first carbon fiber layer, a porous middle layer and a reinforcing layer which are sequentially arranged, wherein the reinforcing layer comprises a second carbon fiber layer and/or a second surface layer; the first surface layer and the second surface layer are metal layers.
2. A composite vibrating plate according to claim 1, wherein the material of the first surface layer, the second surface layer each independently comprises aluminum, an aluminum alloy, a magnesium alloy, titanium or a titanium alloy, preferably an aluminum alloy;
preferably, the thicknesses of the first surface layer and the second surface layer are respectively and independently 30-50 μm.
3. The composite vibration plate according to claim 1 or 2, wherein the first carbon fiber layer and the second carbon fiber layer each independently comprise at least one layer of a carbon fiber composite material;
preferably, the carbon fiber composite material comprises carbon fiber prepreg and/or carbon fiber woven cloth;
preferably, the carbon fiber prepreg includes a resin, and carbon fibers dispersed in the resin; the dispersion includes a random dispersion or a dispersion in a single direction;
preferably, the resin comprises any one of epoxy resin, phenolic resin, polyamide resin or polyimide resin or a combination of at least two of the epoxy resin, the phenolic resin, the polyamide resin or the polyimide resin;
preferably, the length of the carbon fiber is 6-12 mm;
preferably, the diameter of the carbon fiber is 5-10 μm;
preferably, the mass percentage content of the carbon fiber in the carbon fiber composite material is 40-60%;
preferably, the carbon fiber composite material is a carbon fiber prepreg comprising a resin, and carbon fibers randomly dispersed in the resin; the first carbon fiber layer and the second carbon fiber layer comprise at least 1 carbon fiber prepreg;
preferably, the carbon fiber composite material is a carbon fiber prepreg comprising a resin and carbon fibers dispersed in the resin in a single direction; the first carbon fiber layer and the second carbon fiber layer comprise at least 2 layers of the carbon fiber prepregs, and the directions of carbon fibers in each layer of the carbon fiber prepregs are different from each other;
preferably, the thicknesses of the first carbon fiber layer and the second carbon fiber layer are respectively and independently 30-100 μm.
4. The composite vibration plate according to any of claims 1 to 3, wherein the density of the porous intermediate layer is 0.02 to 0.6g/cm3；
Preferably, the thickness of the porous middle layer is 500-1200 μm;
preferably, the material of the porous intermediate layer comprises a honeycomb core material, a foam material or balsa wood;
preferably, the honeycomb core material comprises an aramid honeycomb core or a nylon honeycomb core;
preferably, the density of the honeycomb core material is 0.02-0.2 g/cm3；
Preferably, the foam material comprises polymethacrylimide foam, polyimide foam or polyester foam;
preferably, the density of the polymethacrylimide foam is 0.03-0.32 g/cm3；
Preferably, the density of the balsa wood is 0.05-0.15 g/cm3。
5. The composite vibration plate according to any of claims 1 to 4, wherein the first surface layer, the first carbon fiber layer, the porous intermediate layer and the reinforcing layer are connected by an adhesive layer;
preferably, the thicknesses of the bonding layers are respectively and independently 8-30 μm, and more preferably 9-11 μm;
preferably, the materials of the adhesive layers each independently include any one of epoxy resin, phenolic resin, acrylic resin, or silicone resin, or a combination of at least two thereof.
6. The composite vibration plate according to any one of claims 1 to 5, characterized in that the composite vibration plate comprises a first surface layer, a first carbon fiber layer, a porous intermediate layer, a second carbon fiber layer and a second surface layer, which are arranged in this order;
the first surface layer and the second surface layer are aluminum alloy layers;
the first carbon fiber layer and the second carbon fiber layer respectively and independently comprise at least one layer of carbon fiber composite material, the carbon fiber composite material comprises resin and carbon fibers randomly dispersed in the resin.
7. A method of manufacturing a composite vibration plate according to any of claims 1 to 6, characterized in that the method comprises: sequentially bonding the first surface layer, the first carbon fiber layer, the porous intermediate layer and the reinforcing layer through an adhesive to obtain the composite vibrating plate; the reinforcement layer comprises a second carbon fibre layer and/or a second surface layer.
8. The preparation method according to claim 7, wherein the adhesive comprises any one of or a combination of at least two of an epoxy resin adhesive, a phenolic resin adhesive, an acrylic resin adhesive or a silica gel;
preferably, the first fiber layer comprises at least one layer of carbon fiber composite material, and the carbon fiber composite material comprises carbon fiber prepreg and/or carbon fiber woven cloth;
preferably, the method for preparing the carbon fiber prepreg comprises the following steps: dispersing carbon fibers in resin, and carrying out hot pressing to obtain the carbon fiber composite material;
preferably, the dispersion comprises a random dispersion or a dispersion in a single direction;
preferably, the surface treatment process of the first surface layer and the second surface layer independently comprises spraying or anodizing.
9. A speaker comprising the composite vibration plate according to any one of claims 1 to 6.
10. The speaker of claim 9, wherein the speaker is a flat panel speaker, and wherein a cone of the flat panel speaker comprises the composite diaphragm.
CN202011065905.9A 2020-09-30 2020-09-30 Composite vibrating plate for loudspeaker and preparation method and application thereof Pending CN112211000A (en)

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