阅读说明：本技术 振动板和发声装置 (Vibrating plate and sound generating device ) 是由 王述强 惠冰 凌风光 李春 于 2020-05-20 设计创作，主要内容包括：本发明公开一种振动板和发声装置。其中,所述所述振动板包括至少一层复合纤维层和至少一层发泡体材料层,至少一层所述复合纤维层和至少一层所述发泡体材料层层叠设置,所述复合纤维层中的复合纤维包括碳纤维。本发明的技术方案能够提高振动板的模量,扩宽其频响范围。(The invention discloses a vibrating plate and a sound generating device. The vibrating plate comprises at least one composite fiber layer and at least one foam material layer, wherein the at least one composite fiber layer and the at least one foam material layer are arranged in a laminated mode, and composite fibers in the composite fiber layer comprise carbon fibers. The technical scheme of the invention can improve the modulus of the vibrating plate and widen the frequency response range of the vibrating plate.)

1. The vibrating plate is applied to a sound generating device and is characterized by comprising at least one composite fiber layer and at least one foam material layer, wherein the composite fiber layer and the foam material layer are arranged in a laminated mode, and composite fibers in the composite fiber layer comprise carbon fibers.

2. A vibrating plate according to claim 1, wherein a content of the carbon fiber is 5% to 50% by mass of the composite fiber.

3. A vibration plate according to claim 1, wherein the carbon fiber is a staple fiber, and a length of the staple fiber ranges from 0.5mm to 20 mm.

4. A vibrating plate according to claim 1, wherein the composite fibers in the composite fiber layer further comprise at least one of polyetherimide fibers, polyamide fibers, polypropylene fibers, polyester fibers, and polyethylene fibers.

5. A vibrating plate according to claim 1, wherein the composite fiber layer modulus ranges from 4GPa to 20 GPa; and/or the presence of a gas in the gas,

the thickness of the composite fiber layer ranges from 20 μm to 200 μm.

6. A vibration plate according to claim 1, wherein the foam material in the foam material layer is at least one selected from the group consisting of foamed rubber, thermoplastic elastomer foam, foamed SEBS, foamed nylon, and plastic foam.

7. A vibration plate according to claim 1, wherein the foam material in the foam material layer has an average cell diameter of 3 μm to 200 μm; and/or the presence of a gas in the gas,

the foam material layer has a thickness in a range of 20 to 200 μm.

8. A vibration plate according to claim 1, wherein a thickness of the vibration plate is in a range of 20 μm to 600 μm.

9. A vibrating plate according to any one of claims 1 to 8, wherein said composite fiber further comprises a binder fiber selected from at least one of a polyvinyl alcohol fiber, a polyethylene fiber, a polyamide-nitrile fiber, and a polyvinyl chloride fiber.

10. A vibration plate according to claim 9, wherein the content of the binder fiber is 1 to 10% by mass of the composite fiber.

11. A sound-emitting device characterized by comprising the vibration plate according to any one of claims 1 to 10.

Technical Field

The invention relates to the technical field of sound generating devices, in particular to a vibrating plate and a sound generating device.

Background

The vibration plate is a main component of a sound generating device (such as a speaker), and a material of the vibration plate is required to have a low density in order to improve the sensitivity of the sound generating device, and a sufficient elastic modulus in order to improve the high-frequency cutoff frequency thereof, and a suitable internal damping in order to prevent excessive distortion of the vibration plate. In the related art, the vibrating plate is usually made of paper, the paper vibrating plate is also called a cone, the cone has small density and proper internal damping, and middle and low frequency sound is soft, but the cone is made of a low modulus material and has a low high frequency cut-off frequency, so that the cone is difficult to have a good sound generating effect in a high frequency band, and the frequency response range is narrow.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a vibrating plate and a sound generating device, aiming at improving the modulus of the vibrating plate and widening the frequency response range of the vibrating plate.

In order to achieve the above object, the present invention provides a vibrating plate, which includes at least one composite fiber layer and at least one foam material layer, wherein the at least one composite fiber layer and the at least one foam material layer are stacked, and composite fibers in the composite fiber layer include carbon fibers.

Optionally, the carbon fibers are present in an amount of 5 to 50% by mass of the composite fiber.

Optionally, the carbon fibers are staple fibers having a length in the range of 0.5mm to 20 mm.

Optionally, the composite fibers in the composite fiber layer further include at least one of polyetherimide fibers, polyamide fibers, polypropylene fibers, polyester fibers, and polyethylene fibers.

Optionally, the composite fiber layer modulus ranges from 4GPa to 20 GPa; and/or the thickness of the composite fiber layer ranges from 20 μm to 200 μm.

Optionally, the foam material in the foam material layer is selected from at least one of foamed rubber, thermoplastic elastomer foam, foamed SEBS, foamed nylon and plastic foam.

Optionally, the foam material in the foam material layer has an average foam cell size of 3 to 200 μm; and/or the foam material layer has a thickness in the range of 20 to 200 μm.

Optionally, the thickness of the vibrating plate ranges from 20 μm to 600 μm.

Optionally, the composite fiber further comprises a binder fiber selected from at least one of polyvinyl alcohol fiber, polyethylene fiber, polyamide-nitrile fiber, polyvinyl chloride fiber.

Optionally, the binder fiber is present in an amount of 1% to 10% by mass of the composite fiber.

The invention further provides a sound production device which comprises a vibration plate, wherein the vibration plate comprises at least one composite fiber layer and at least one foam material layer, the at least one composite fiber layer and the at least one foam material layer are arranged in a laminated mode, and composite fibers in the composite fiber layer comprise carbon fibers.

According to the technical scheme, the vibrating plate comprises at least one composite fiber layer and at least one foaming material layer which are arranged in a laminated mode, compared with a paper vibrating plate, the vibrating plate is high in modulus, low in density and proper in damping, when the vibrating plate is applied to a sound generating device, the sound generating device is soft in sound generation, wide in frequency response range and good in sound generating effect in a high frequency band. Furthermore, the composite fibers in the composite fiber layer comprise carbon fibers, and the carbon fibers are uniformly dispersed in the composite fibers to form a three-dimensional network structure, so that the modulus of the composite fiber layer can be further enhanced, and the modulus of the vibrating plate can be further enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic partial structure diagram of a sound generating device according to an embodiment of the present invention;

FIG. 2 is a graph of the effect of carbon fiber content on modulus in a composite fiber;

FIG. 3 is a graph of the effect of carbon fiber length on its modulus;

FIG. 4 is a graph showing the effect of the average cell size of the foam on the damping of the foam;

FIG. 5 is a graph showing the effect of foam occupancy on diaphragm density and internal damping;

fig. 6 is a graph showing the frequency response of the diaphragm and cone of the present invention applied to a speaker.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Sound producing device	20	Ball top
10	Folded ring part	30	Voice coil

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a vibrating plate, which is applied to a sound generating device 100, wherein the sound generating device 100 can be a loudspeaker.

Referring to fig. 1, the sound generating device 100 includes a dome portion 20, a folded ring portion 10 and a voice coil 30, the folded ring portion 10 is disposed at an edge position of the sound generating device 100, the dome portion 20 is located at a central position of the sound generating device 100, the dome portion 20 is connected to one side of the folded ring portion 10, the voice coil 30 is connected to the other side of the folded ring portion 10, the dome portion 20 is a vibration plate of the present invention, and the vibration plate vibrates by sensing external sound changes. When the sound generating device 100 is assembled, the edge portion 10 is attached to a housing of the sound generating device 100, the housing is provided with a sound through hole corresponding to the vibrating plate, and the sound generating device generates corresponding sound through vibration of the vibrating plate.

In an embodiment of the present invention, a vibrating plate includes at least one composite fiber layer and at least one foam material layer, the at least one composite fiber layer and the at least one foam material layer are stacked, and composite fibers in the composite fiber layer include carbon fibers.

The vibrating plate is of a composite layer structure, and can be two layers, namely a composite fiber layer and a foaming material layer, and the composite fiber layer and the foaming material layer are connected through gluing or hot pressing. Naturally, the vibrating plate may also be two or more layers, including at least one composite fiber layer and at least one foam material layer, the multiple layers are stacked, and the two adjacent layers are connected by gluing or hot pressing. The composite fiber in the composite fiber layer comprises carbon fiber, and the other is polymer fiber, that is, the composite fiber is formed by compounding the carbon fiber and the polymer fiber, and the composite fiber is also called carbon paper. Because the carbon fiber has extremely high modulus, the modulus of the composite fiber is also high, and the modulus of the composite fiber is usually about 3 to 10 times that of the paper material. The vibrating plate is compounded by the composite fiber layer and the foam material layer, so that the vibrating plate not only has lower density, but also has proper internal damping, soft sounding and wider frequency response range.

Therefore, it can be understood that, according to the technical scheme of the invention, the vibrating plate comprises at least one composite fiber layer and at least one foam material layer which are arranged in a laminated manner, compared with a paper vibrating plate, the vibrating plate has the advantages of higher modulus, lower density and proper damping, when the vibrating plate is applied to a sound generating device, the sound generation is softer, the frequency response range is wider, and the sound generating effect is better in a high-frequency range. Furthermore, the composite fibers in the composite fiber layer comprise carbon fibers, and the carbon fibers are uniformly dispersed in the composite fibers to form a three-dimensional network structure, so that the modulus of the composite fiber layer can be further enhanced, and the modulus of the vibrating plate can be further enhanced.

Optionally, the content of the carbon fiber is 5 to 50% by mass of the composite fiber.

The carbon fibers are the main components of the composite fibers, the carbon fibers play a decisive role in enhancing the modulus of the composite fiber layer, the enhancing effect of the carbon fibers depends on the content of the carbon fibers, please refer to fig. 2, fig. 2 is a graph showing the influence of the content of the carbon fibers in the composite fibers on the modulus, and it can be seen from the graph that the higher the content of the carbon fibers is, the better the enhancing effect on the modulus of the composite fiber layer is, but when the content of the carbon fibers is too high, the composite fiber layer material is brittle, the toughness is poor, and the composite fiber layer material is difficult to process, so the content of the carbon fibers needs to be selected appropriately. Generally, the carbon fiber may be contained in an amount of 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, or 50 parts, based on 100 parts of the total mass of the composite fiber material.

Optionally, the carbon fibers are staple fibers having a length in the range of 0.5mm to 20 mm.

The carbon fibers are short fibers, namely chopped fibers. The length of the carbon fibers in the composite fibers also has a significant effect on the modulus-enhancing effect of the composite fibers. Referring to fig. 3, fig. 3 is a graph illustrating the effect of the length of carbon fiber on its modulus. It can be understood that, in the case of a certain carbon fiber content, the longer the carbon fiber length is, the easier the three-dimensional net-shaped reinforcing structure is formed in the composite fiber material, and the better reinforcing effect is achieved. When the length of the carbon fiber is too short, the modulus reinforcing effect is not obvious; however, when the length of the carbon fiber is increased to a certain extent, the modulus-enhancing effect thereof is no longer enhanced as the length of the carbon fiber is increased. So optionally the length of the carbon fibres may be 0.5mm, 1.5mm, 3.5mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm or 20 mm.

Optionally, the composite fibers in the composite fiber layer further comprise at least one of polyetherimide fibers, polyamide fibers, polypropylene fibers, polyester fibers, and polyethylene fibers.

The polyetherimide fiber is a high-modulus fiber, the modulus of the polyetherimide fiber is higher than that of paper, and the polyetherimide fiber has excellent high-temperature resistance and can be used at 180 ℃ for a long time. After the carbon fiber is compounded with the carbon fiber, the carbon fiber can be inserted into the polyetherimide fiber to form a reinforced three-dimensional network structure, so that the modulus of the composite fiber material can be effectively improved, and the loss factor of the composite fiber material is also improved. When the composite fiber layer made of the composite fiber material is used as vibration, the composite fiber layer not only has a wider frequency response range, is accurate in sound production and lower in distortion, but also can bear higher power due to excellent high-temperature resistance, and ensures that a sound production device has a better sound production effect under larger using power.

The polyamide fiber has higher modulus, can form a three-dimensional grid structure after being compounded with the carbon fiber, has higher modulus and more proper damping, so that the vibrating plate made of the composite fiber layer has wider frequency response range, lower distortion and better sound production effect. Meanwhile, the polyamide fiber has better abrasion resistance and elasticity, so that the manufactured vibrating plate has better friction and impact resistance.

Polypropylene fibers have better hydrophobicity and generally have better stability before and after exposure to water. After polypropylene fiber and carbon fiber are compounded, a three-dimensional network structure can be formed, the modulus of the composite fiber layer is effectively improved, the composite fiber layer is of a sparse structure with gaps, the density of the composite fiber layer is close to that of paper, but the specific elasticity of the composite fiber layer is far higher than that of the paper, and the composite fiber layer has a higher frequency response range. In addition, the composite fiber also has proper damping and good hydrophobic performance, so that the acoustic performance of the sound generating device is not easily influenced by the environmental humidity, and the composite fiber has good stability.

The polyester fiber is also called terylene, has higher modulus, elasticity, high temperature resistance and wear resistance, can form a three-dimensional grid structure after being compounded with the carbon fiber, has higher modulus and more proper damping, so that the vibrating plate made of the composite fiber layer has wider frequency response range, lower distortion and better sound production effect. Meanwhile, the polyester fiber has better abrasion resistance and elasticity, so that the manufactured vibrating plate has better friction and impact resistance.

Polyethylene fibers, also known as polyethylene, have a high modulus, good chemical and corrosion resistance, and good heat resistance. After being compounded with carbon fibers, the composite fiber layer can form a three-dimensional network structure, the modulus is high, the damping is proper, and the vibrating plate made of the composite fiber layer has a wide frequency response range, low distortion and a good sound production effect. Meanwhile, the manufactured vibrating plate has good chemical resistance, corrosion resistance and heat resistance.

It is understood that the other polymer fibers in the composite fiber may be one or more of polyetherimide fiber, polyamide fiber, polypropylene fiber, polyester fiber, and polyethylene fiber.

Optionally, the composite fiber layer modulus ranges from 4GPa to 20 GPa.

The composite fiber layer adopts the composite fiber material compounded by the carbon fibers and the polymer fibers, and the carbon fibers are uniformly dispersed in the composite fibers to form a three-dimensional reticular reinforced structure through the compounding of the carbon fibers and the polymer fibers, so that the storage modulus of the composite fiber layer is effectively improved. Typically, the modulus of the composite fiber layer is 4GPa, 8GPa, 12GPa, 15GPa, 18GPa or 20 GPa.

In general, aiming at different requirements, the mass and rigidity of the vibrating plate can be adjusted by adjusting the thickness of the vibrating plate so as to meet the requirements of the sounding devices with different sizes. Smaller size sound generator products may use thinner diaphragms to reduce the mass of the diaphragms; larger size sound generator products use thicker vibration plates to provide rigidity to the vibration plates. Generally, the thickness of the vibrating plate is in the range of 20 μm to 600 μm, and preferably in the range of 30 μm to 500 μm. For example, the thickness of the vibrating plate may be 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm or 500 μm.

Optionally, the composite fiber layer has a thickness in a range of 20 μm to 200 μm. The thickness of the composite fiber layer also influences the basic modulus of the vibrating plate, on the premise that the thickness of the vibrating plate is not changed, the modulus of the vibrating plate is higher the later the thickness of the composite fiber layer is, and when the composite fiber layer is too thick, the damping of the vibrating plate is reduced, so that the composite fiber layer with the proper thickness needs to be selected. Generally, the thickness of the composite fiber layer is 10% to 70% based on 100% of the total thickness of the vibration plate. Optionally, the thickness of the composite fibre layer ranges from 20 μm to 200 μm, such as the thickness of the composite fibre layer is 20 μm, 50 μm, 80 μm, 100 μm, 120 μm, 150 μm, 180 μm or 200 μm.

Optionally, the foam material in the foam material layer is selected from at least one of foamed rubber, thermoplastic elastomer foam, foamed SEBS, foamed nylon and plastic foam.

The foam material layer is used as a component of the vibration plate, and can play a role in reducing the density of the vibration plate, and meanwhile, the foam material layer also provides proper internal damping for the vibration plate, so that the distortion of the sound production device is reduced. The foaming material can be one or more of foaming rubber, thermoplastic elastomer foaming body, foaming SEBS, foaming nylon and plastic foaming body.

Optionally, the foam material in the foam material layer has an average foam cell diameter of 3 μm to 200 μm.

Referring to fig. 4, fig. 4 is a graph illustrating the influence of the average cell diameter of the foam on the damping of the foam. It can be seen from the figure that the average cell size of the foam material has a certain influence on the density and damping of the foam material, and under the condition that the structure of the vibrating plate is not changed, the smaller the average cell size of the foam is, the higher the damping of the foam material is, and the vibrating plate has higher damping. However, when the cell diameter is too high, the density of the foam material also increases, and the foam material has too high a density, which affects the quality of the diaphragm. Therefore, an appropriate average cell diameter should be selected, and in general, the average cell diameter of the foam is 3 μm, 50 μm, 100 μm, 150 μm or 200. mu.m.

Optionally, the foam material layer has a thickness in a range of 20 μm to 200 μm.

In the case where the total thickness of the vibration plate is not changed, the density of the composite vibration plate can be adjusted by adjusting the thickness of the foam material layer, and the damping of the vibration plate can be adjusted at the same time. Generally, the thickness of the foam material layer is 30% to 90% based on 100% of the total thickness of the vibration plate. The thickness of the foam material layer may be 3 μm, 50 μm, 100 μm, 150 μm or 200 μm.

Referring to fig. 5, fig. 5 is a schematic diagram of an influence curve of the foam content to the density and the internal damping of the vibrating plate, and it can be seen from the diagram that as the foam content increases, the density of the vibrating plate gradually decreases and the damping of the vibrating plate gradually increases, so that the density of the composite vibrating plate can be adjusted by adjusting the thickness of the foam material layer, and the damping of the vibrating plate can be adjusted, so that the vibrating plate has a proper density and damping.

Further, the composite fiber also comprises a binding fiber, and the binding fiber is selected from at least one of polyvinyl alcohol fiber, polyethylene fiber, polyamide nitrile fiber and polyvinyl chloride fiber.

In the composite fiber, the polymer fiber and the carbon fiber are combined together through fiber melting, the better the bonding strength of the carbon fiber and the polymer fiber is, and the better the reinforcing effect of the carbon fiber is. In order to enhance the bonding force between the carbon fibers and the polymer fibers, the bonding fibers are added to increase the bonding between the fibers and enhance the bonding effect of the fibers. When the binder fiber is selected, one or more of polyvinyl alcohol fiber, polyethylene fiber, polyamide nitrile fiber and polyvinyl chloride fiber can be selected.

Since the binder fiber mainly plays a role in enhancing the inter-fiber bonding, and if the content is too low, the bonding effect is affected, and if the content is too high, the overall modulus of the composite fiber material is affected, the binder fiber is suitably used, and optionally, the content of the binder fiber is 1 to 10% by mass of the composite fiber. That is, the binder fiber may be included in an amount of 1 part, 3 parts, 5 parts, 8 parts, or 10 parts, based on 100 parts of the total mass of the composite fiber.

It should be noted that the vibrating plate of the present invention can be prepared by the following steps:

firstly, dispersing polymer fibers and carbon fibers into a solvent, uniformly mixing, and removing the solvent to obtain the composite fiber material. Wherein, the content of the polymer fiber is 50-90 parts and the content of the carbon fiber is 5-50 parts based on 100 parts of the total mass of the composite fiber. The solvent can be water or organic solvent, and the organic solvent can be one or more of methanol, ethanol, isopropanol, acetone, butanone, ethyl acetate, butyl acetate, n-hexane, cyclohexane, petroleum ether and toluene.

Secondly, the composite fiber material is placed in a hot-pressing mould, and the conical basin-shaped composite fiber layer is hot-pressed at the hot-pressing temperature of 180-200 ℃.

And simultaneously, cutting and molding the foaming body material, putting the foaming body material into a hot-pressing die, carrying out hot-pressing treatment on the foaming body material and the composite fiber layer together, and carrying out hot-pressing treatment at the temperature of 80-120 ℃ to obtain the vibrating plate.

In order to enhance the adhesion between the carbon fiber and the polyamide fiber in the composite fiber, a binder fiber is further added to the solvent, and the content of the binder fiber is 1 to 20 parts by mass based on 100 parts by mass of the polyamide fiber.

Furthermore, in order to enhance the dispersion effect of the carbon fibers in the solvent, a surfactant can be added into the solvent, and the adding amount of the surfactant is 0.2-5 parts by mass of the solvent. Here, the surfactant may be one or more of Disodium Lauryl Sulfosuccinate (DLS), disodium fatty alcohol-polyoxyethylene ether (3) sulfosuccinate Monoester (MES), disodium coconut monoethanolamide sulfosuccinate monoester (DMSS), monolauryl phosphate (MAP), potassium monolauryl phosphate (MAPK), potassium laureth phosphate (MAEPK), ammonium fatty alcohol-polyoxyethylene ether (EO ═ 3) sulfate (AESA), Coconut Monoethanolamide (CMEA), cocamidopropyl betaine (CAB-35), lauramidopropyl betaine (LAB-35), Cocamidopropyl Hydroxysultaine (CHSB), lauramidopropyl hydroxysultaine (LHSB-35), and fatty acid potassium Soap (SFP).

Further, the carbon fiber may be carbon fiber treated with a silane coupling agent in order to enhance adhesion of the carbon fiber to the polyamide fiber, where the silane coupling agent may be at least one of KH-540, KH-550, KH-560, KH-570, KH-590, KH-792, Si-602, Si-563, and A-151.

It should be noted that the addition of the silane coupling agent can also improve the dispersibility of the carbon fibers in water, and it can be understood that when the silane coupling agent is selected to treat the carbon fibers, the surfactant can not be added, and the dispersing effect of the carbon fibers can also be enhanced, so that the material cost for preparing the composite fibers can be saved to a certain extent.

The invention also provides a sound generating device, which comprises the vibrating plate as described above, and the specific structure of the vibrating plate refers to the foregoing embodiment. Since the sound generating device adopts all technical solutions of all the foregoing embodiments, at least all the beneficial effects brought by the technical solutions of the foregoing embodiments are achieved, and no further description is given here.

The diaphragm and the speaker of the present invention will be described in detail below with reference to specific examples.

Example 1

The vibration plate of the present example was prepared by the following steps:

1. weighing 100 parts by mass of polymer fibers with the diameter of 10 mu m, cutting into short fibers with the length of 20mm-40mm, dispersing into 400 parts by mass of ethanol solvent, and stirring to uniformly disperse the short fibers.

2. 40 parts of carbon fibers with the diameter of 7 mu m are weighed, cut into short fibers with the average length of 20mm, added into the ethanol solvent, and stirred continuously to ensure that the two fibers are uniformly dispersed in the ethanol solvent.

3. Removing the two fibers from the ethanol solvent, drying to remove the ethanol solvent, and obtaining the composite fiber material with the carbon fibers and the polymer fibers uniformly compounded, wherein the composite fiber material is in a three-dimensional net structure.

4. Placing the composite fiber material in a mold, and performing hot press molding at the temperature of 190 ℃ to obtain a cone-basin-shaped composite fiber layer;

5. and (4) repeating the step so as to obtain two composite fiber layers.

6. And cutting and molding a thermoplastic elastomer foaming body with the thickness of 100 mu m, putting the thermoplastic elastomer foaming body between the two composite fiber layers, putting the two composite fiber layers together into a hot-pressing mold, and performing hot-pressing molding at the temperature of 100 ℃ to obtain the vibrating plate, wherein the vibrating plate comprises two composite fiber layers and a thermoplastic elastomer foaming body layer which are connected in a hot-pressing mode.

The prepared vibrating plate and the paper cone are applied to a loudspeaker, and the frequency response curve of the loudspeaker is measured, as shown in figure 6, the loudspeaker applied by the vibrating plate has higher sensitivity and wider frequency response range, the frequency response curve is flatter, and the sound production state is easy to control.

Example 2

The carbon fiber of example 1 was treated with a coupling agent, and the other steps were the same as those of example 1.

The specific steps of treating the carbon fiber by the coupling agent are as follows:

firstly, 10 parts of coupling agent is added into a blending solvent of 100 parts of water and 900 parts of ethanol, and the mixture is fully stirred to obtain the pretreating agent.

Then, 40 parts of 7 μm diameter carbon fibers were cut into short fibers having an average length of 20mm, and the short fibers were added to the above pretreating agent, sufficiently stirred, and then allowed to stand for 4 hours.

And then filtering and taking out the treated carbon fiber, and drying to obtain the carbon fiber after surface treatment.

Here, the coupling agent may be one or more selected from KH-540, KH-550, KH-560, KH-570, KH-590, KH-792, Si-602, Si-563 and A-151. And the amount of the coupling agent is in the range of 0.1 to 2 parts by mass based on 100 parts by mass of the blending solvent.

When the diaphragm obtained in example 2 was applied to a speaker, it was found through experiments that the diaphragm also had a high sensitivity and a wide frequency response range, and the frequency response curve was flat, and the sound emission state was easily controlled.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.