CN212910054U - Composite vibration plate for loudspeaker and loudspeaker comprising same - Google Patents
Composite vibration plate for loudspeaker and loudspeaker comprising same Download PDFInfo
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- CN212910054U CN212910054U CN202022206841.1U CN202022206841U CN212910054U CN 212910054 U CN212910054 U CN 212910054U CN 202022206841 U CN202022206841 U CN 202022206841U CN 212910054 U CN212910054 U CN 212910054U
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Abstract
The utility model provides a compound vibration board and contain its speaker for speaker, compound vibration board includes first superficial layer, first carbon fiber layer, porous intermediate layer and the enhancement layer that sets gradually, the enhancement layer includes second carbon fiber layer and/or second superficial layer; the first surface layer and the second surface layer are metal layers. The utility model discloses a special design with the hierarchical structure of light and high strength characteristic has given composite vibrating board low density, high strength and high modulus's characteristic are showing the mechanical properties who has improved the vibration board under the condition that does not increase weight, can realize diversified outward appearance through surface treatment process moreover. The composite vibration plate is used as a vibration part 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
Technical Field
The utility model belongs to the technical field of the speaker, concretely relates to a speaker that is used for compound vibration board of speaker and contains it.
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. Since the component 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, it is one of effective ways to develop vibration components with various properties 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 also has a large lifting 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 has good acoustic performance, can not absorb water and moisture in a humid environment, but has lower mechanical performance, 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 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.
SUMMERY OF THE UTILITY MODEL
To the deficiency of the prior art, an object of the utility model is to provide a speaker that is used for compound vibration board of speaker and contains it, through the structural design of first superficial layer, first carbon fiber layer, porous intermediate level and enhancement layer, make compound vibration board has excellent rigidity and elastic modulus, and density is little, the quality is light simultaneously, can satisfy speaker high sensitivity and high cut-off frequency's performance requirement.
In order to achieve the purpose of the utility model, the utility model adopts the following technical proposal:
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 reinforcing layer, which are sequentially disposed, 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.
The utility model provides a composite vibration board is including the first superficial layer, first fibrous stratum fibrosum, porous intermediate level and the enhancement layer of range upon range of setting in proper order, the enhancement layer includes arbitrary one or the combination of the two in second fibrous stratum fibrosum, the second superficial layer, specifically includes three kinds of stacked structures promptly: (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. The utility model discloses a hierarchical structure's design has given composite vibration board low density, high strength and high modulus's characteristic are showing the mechanical properties who has improved panel under the condition that does not increase weight, make composite vibration board can the fully provided loudspeaker demand such as high sensitivity, high frequency cut-off frequency and diversified outward appearance.
Preferably, the first surface layer and the second surface layer are each independently an aluminum layer, an aluminum alloy layer, a magnesium alloy layer, a titanium layer, or a titanium alloy layer, and more preferably an aluminum alloy layer.
Preferably, the magnesium alloy layer is a magnesium aluminum alloy layer.
Preferably, the thickness of the first surface layer and the second surface layer is 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 present invention is not exhaustive.
As the utility model discloses a preferred technical scheme, first superficial layer, the preferred aluminum alloy layer that is of second superficial layer, the aluminum alloy has the characteristics of light, has higher mechanical strength simultaneously, easily processes moreover, and the formability is good, and appearance treatment method is various, can carry out surface treatment through spraying or anodic oxidation, and corrosion resistance is strong. 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 first carbon fiber layer and the second carbon fiber layer each independently include at least one carbon fiber composite layer, and the carbon fiber composite layer is a carbon fiber prepreg layer or a carbon fiber woven fabric layer.
As the preferred technical scheme of the utility model, first carbon fiber layer, second carbon fiber layer independently include at least one deck carbon fiber composite bed respectively, and carbon-fibre composite material (CFRP)'s proportion is less than the quarter of steel material (like A3 steel), and tensile strength can reach 3500MPa more than, is 7 ~ 9 times of steel material, and tensile elastic modulus can reach 23 ~ 43GPa, also is higher than steel material; therefore, the specific strength (strength to density ratio) of the carbon fiber composite layer can reach 2000 MPa-g-1·cm3Whereas the specific strength of A3 steel is only 59MPa g-1·cm3On the left and right, itThe specific modulus is also higher than that of steel materials. The utility model discloses an at least one deck high strength's carbon fiber composite bed is introduced in at least one side in porous intermediate level, is showing and is improving composite vibration board's intensity and modulus.
Preferably, the carbon fiber prepreg layer 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 includes any one of an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin.
Preferably, the length of the carbon fiber is 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 the specific point values between the above point values are limited to space and for the sake of brevity, the present invention does not exhaustive list the specific point values included in the range.
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 between the above points are limited to space and for the sake of brevity, and the present invention does not provide an exhaustive list of specific points included in the range.
Preferably, the mass percentage of the carbon fiber in the carbon fiber composite layer is 40-60%, for example, 41%, 43%, 45%, 47%, 49%, 50%, 51%, 53%, 55%, 57% or 59%, and the specific values therebetween are limited to space and for the sake of brevity, and the present invention does not provide an exhaustive list of the specific values included in the range.
As the preferable technical scheme of the utility model, the mass percentage content of the carbon fiber in the carbon fiber composite layer 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 layer cannot meet the use requirement.
Preferably, the carbon fiber composite layer is a carbon fiber prepreg layer, and the carbon fiber prepreg layer comprises 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 layer.
As the utility model discloses an optimized technical scheme, the carbon fiber composite bed is the carbon fiber prepreg layer, carbon fiber random (non-directional) dispersion in the resin in the carbon fiber prepreg layer makes first carbon fiber layer, second carbon fiber layer have isotropy, can avoid the uneven phenomenon of speaker vibration board mechanical properties distribution, also can avoid the vibration board to produce the crackle easily in the lower direction of intensity, make the tone quality of speaker more penetrating clear.
Preferably, the carbon fiber composite layer is a carbon fiber prepreg layer, and the carbon fiber prepreg layer comprises resin and carbon fibers dispersed in the resin along a single direction; the first carbon fiber layer and the second carbon fiber layer comprise at least 2 carbon fiber prepreg layers, and the directions of carbon fibers in the carbon fiber prepreg layers are different from each other.
As another preferred technical solution of the present invention, the carbon fiber composite layer is a carbon fiber prepreg layer, and carbon fibers in the carbon fiber prepreg layer are dispersed in resin along a single direction; the first carbon fiber layer and the second carbon fiber layer comprise at least 2 carbon fiber prepreg layers, and the directions of carbon fibers in each carbon fiber prepreg layer are different from each other (preferably 90-degree staggered), that is, the carbon fibers in the first carbon fiber layer and the second carbon fiber layer are in staggered distribution, so that the carbon fiber distribution of the first carbon fiber layer and the second carbon fiber layer has certain isotropy, and cracks of the loudspeaker vibration plate in the direction with lower strength are avoided.
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 limited in space and for the sake of brevity, and the present invention is not intended to be exhaustive of the specific point values included in the range.
Preferably, the porous intermediate layer is a honeycomb core layer, a foam layer or a balsa layer.
The density of the porous intermediate 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 stated values, 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.
The thickness of the porous intermediate layer is 500-1200 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, but for reasons of brevity and clarity.
As the utility model discloses a preferred technical scheme, porous intermediate level includes honeycomb sandwich layer, foam blanket (expanded material) or bal sand wood layer, and above-mentioned material layer density is less, has certain intensity again, can provide when the certain thickness of composite vibrating board, reduce the holistic weight of vibration board as far 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 like.
Preferably, the foam layer comprises a polymethacrylimide foam layer (PMI foam), a polyimide foam layer or a polyester foam layer.
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 like.
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 like.
Preferably, the first surface layer, the first carbon fiber layer, the porous middle layer and the reinforcing layer are connected through bonding layers; the thickness of the adhesive layer is 8-30 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 point values between the above point values are limited to space and for simplicity, the present invention does not exhaust the specific point values included in the range, and further preferably 9-11 μm.
Preferably, the adhesive layers each independently comprise an epoxy layer, a phenolic layer, an acrylic layer, or a silicone layer.
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 carbon fiber composite layer, and the carbon fiber composite layer is a carbon fiber prepreg layer or a carbon fiber woven fabric layer.
Illustratively, the composite vibration plate is prepared by the following method: 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.
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 of the utility model is particularly suitable for being used as a sound basin of a flat panel loudspeaker, the sound source of the flat panel loudspeaker is the whole surface, but not the point sound source of the traditional sound equipment, 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 is required to have the characteristics of light weight and high strength; the utility model discloses above-mentioned composite vibration board has light, high strength and high modulus's characteristics concurrently through the design of hierarchy structure, can fully satisfy flat loudspeaker's performance requirement.
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 utility model discloses following beneficial effect has:
the utility model provides a composite vibration board has been given including the first superficial layer, first carbon fiber layer, porous intermediate level and the enhancement layer that set gradually through the special design that has the hierarchical structure of light and high strength characteristic composite vibration board low density, high strength and high modulus's characteristic is showing the mechanical properties who has improved panel under the condition that does not increase weight, can realize diversified outward appearance through surface treatment process moreover. 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 part 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 will be further explained by the following embodiments. It should be understood by those skilled in the art that the described embodiments are merely provided to assist in understanding the present invention and should not be construed as specifically limiting 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 carbon fiber composite layers, and the thicknesses of the carbon fiber composite layers are both 30 micrometers; the carbon fiber composite layer is a carbon fiber prepreg layer and comprises epoxy resin (HS 835A, Panyu Heyu company) and chopped carbon fibers (the length is 6-12 mm, the average diameter is 7 mu m) randomly dispersed in the epoxy resin, and the mass percentage content of the carbon fibers in the carbon fiber composite layer is 55%;
(3) the porous middle layer is a PMI foam layer 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 bonding layer (the trade name is HS835B, purchased from Panyu Heyu constant acoustic 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 layer (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 layer;
(2) sequentially overlapping the carbon fiber composite layer 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 carbon fiber prepreg layers, and the thicknesses of the carbon fiber prepreg layers are both 50 micrometers; the carbon fibers in the carbon fiber prepreg layer are randomly dispersed;
(3) the porous intermediate layer has a thickness of 1000 μmPMI foam layer of (1) having a 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 bonding layer 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 layer with the thickness of 9 mu m.
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 carbon fiber prepreg layers, and the thicknesses of the carbon fiber prepreg layers are both 100 micrometers; the carbon fibers in the carbon fiber prepreg layer are randomly dispersed;
(3) the porous intermediate layer is a PMI foam layer with the thickness of 600 mu m and the density of 0.205g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous intermediate layer, the second carbon fiber layer and the second surface layer are connected through an epoxy resin bonding layer with the thickness of 10 mu m.
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 carbon fiber prepreg layers, and the thicknesses of the carbon fiber prepreg layers are both 80 micrometers; the carbon fibers in the carbon fiber prepreg layer are randomly dispersed;
(3) the porous intermediate layer is a 900 μm thick balsa layer with a density of 0.08g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous intermediate layer, the second carbon fiber layer and the second surface layer are connected through an acrylic resin adhesive layer with the thickness of 11 mu m.
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 carbon fiber prepreg layers, and the thicknesses of the carbon fiber prepreg layers are both 100 micrometers; the carbon fibers in the carbon fiber prepreg layer are randomly dispersed;
(3) the porous middle layer is a nylon honeycomb core layer 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 an epoxy resin bonding layer with the thickness of 11 mu m.
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 carbon fiber prepreg layers, and the thicknesses of the carbon fiber prepreg layers are both 80 micrometers; the carbon fibers in the carbon fiber prepreg layer are randomly dispersed;
(3) the porous middle layer is aramid fiber bee with the thickness of 1200 mu mA pit core layer with a density of 0.04g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous intermediate layer, the second carbon fiber layer and the second surface layer are connected through an epoxy resin bonding layer with the thickness of 10 mu m.
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 carbon fiber prepreg layers, and the thicknesses of the carbon fiber prepreg layers are both 70 micrometers; the carbon fibers in the carbon fiber prepreg layer are randomly dispersed;
(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 intermediate layer and the second carbon fiber layer are connected through epoxy resin bonding layers with the thickness of 12 mu m.
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 a carbon fiber prepreg layer, and the thickness of the first carbon fiber layer is 80 mu m; the carbon fibers in the carbon fiber prepreg layer are randomly dispersed;
(3) the porous middle layer is an aramid fiber honeycomb core layer with the thickness of 1000 mu m and the density of 0.04g/cm3；
(4) The first surface layer, the first carbon fiber layer, the porous intermediate layer and the second surface layer are connected through an epoxy resin bonding layer with the thickness of 10 mu m.
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 carbon fiber prepreg layers; the carbon fibers in the carbon fiber prepreg layer are dispersed along a single direction; the carbon fiber directions of the 2 carbon fiber prepreg layers in the first carbon fiber layer are mutually vertical; the carbon fiber directions of the 2 carbon fiber prepreg layers in the second carbon fiber layer are mutually vertical; the other hierarchical structures are 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 layer having a thickness of 50 μm (designation C6442, available from changtou roughcast company); the other hierarchical structures are the same as in example 1.
Comparative example 1
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 arrangements and their thicknesses 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 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 arrangements and their thicknesses 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 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 arrangements and their thicknesses 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 3 according to the test method described above, and the results are shown in table 1.
TABLE 1
According to the data in Table 1, the utility model provides a composite vibration board has low density, high modulus and high tensile strength's characteristic, and its density is low to 0.3 ~ 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 also be used for preparing the loudspeaker coneThe loudspeaker is prevented from being broken and failed in working, and the reliability is guaranteed.
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 described through the above embodiments, but the present invention is not limited to the above embodiments, that is, the present invention must not rely on the above embodiments to be implemented. It should be clear to those skilled in the art that any improvement of the present invention is to the equivalent replacement of the selected raw materials, the addition of auxiliary components, the selection of specific modes, etc., all fall within the protection scope and disclosure scope of 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. The composite vibration plate according to claim 1, wherein the first surface layer and the second surface layer are each independently an aluminum layer, an aluminum alloy layer, a magnesium alloy layer, a titanium layer, or a titanium alloy layer; the thicknesses of the first surface layer and the second surface layer are respectively and independently 30-50 mu m.
3. The composite vibration plate according to claim 1, wherein the first carbon fiber layer and the second carbon fiber layer each independently include at least one carbon fiber composite layer, and the carbon fiber composite layer is a carbon fiber prepreg layer or a carbon fiber woven fabric layer.
4. The composite vibration plate according to claim 1, wherein the first carbon fiber layer and the second carbon fiber layer each independently have a thickness of 30 to 100 μm.
5. The composite vibrating plate of claim 1, wherein the porous intermediate layer is a honeycomb core layer, a foam layer, or a balsa layer; the density of the porous intermediate layer is 0.02-0.6 g/cm3(ii) a The thickness of the porous middle layer is 500-1200 mu m.
6. The composite vibration plate according to claim 1, wherein the first surface layer, the first carbon fiber layer, the porous intermediate layer, and the reinforcing layer are connected by an adhesive layer; the thickness of the bonding layers is 8-30 μm.
7. The composite vibrating plate of claim 6, wherein the adhesive layers each independently comprise an epoxy layer, a phenolic layer, an acrylic layer, or a silicone layer.
8. The composite vibration plate according to any one of claims 1 to 7, 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 carbon fiber composite layer, and the carbon fiber composite layer is a carbon fiber prepreg layer or a carbon fiber woven fabric layer.
9. A speaker comprising the composite vibration plate according to any one of claims 1 to 8.
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.
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