CN106060721B - Vibrating diaphragm and coating method thereof - Google Patents
Vibrating diaphragm and coating method thereof Download PDFInfo
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- CN106060721B CN106060721B CN201610627028.7A CN201610627028A CN106060721B CN 106060721 B CN106060721 B CN 106060721B CN 201610627028 A CN201610627028 A CN 201610627028A CN 106060721 B CN106060721 B CN 106060721B
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- -1 polyethylene terephthalate Polymers 0.000 claims abstract description 10
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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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
- H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
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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
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
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- Engineering & Computer Science (AREA)
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- Acoustics & Sound (AREA)
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Abstract
The invention relates to a diaphragmThe vibrating diaphragm comprises a base material layer, a strengthening layer and a glue layer coated on the surface of the strengthening layer, wherein the base material layer is a thin film made of any one of materials including polyetherimide, polyethylene terephthalate, polyether ether ketone, polyphenylene sulfide and polyurethane, the strengthening layer is made of graphene or a mixture of the graphene and graphite powder which are uniformly mixed through a diluent, and the weight ratio of the graphene to the diluent is (5-10) to (9995-9990); the weight ratio of the graphite powder, the graphene and the diluent is (5-10): 9990-9980; the glue layer is coated on the surface of the strengthening layer. The method comprises the following steps: adding graphene or a mixture of graphene and graphite powder into a diluent, and uniformly mixing to form a graphene suspension or a graphene-graphite powder suspension; coating the graphene suspension or the graphene-graphite powder suspension on the surface of a base material; and coating the glue on the surface of the strengthening layer and drying. The vibrating diaphragm of the invention has strong rigidity and reduces the resonant frequency f0The high-frequency sound pressure is increased, and the high-frequency and low-frequency characteristics are improved.
Description
Technical Field
The invention relates to the technical field of acoustic diaphragms, in particular to a diaphragm and a coating method thereof.
Background
With the rapid development of scientific technology, people have higher and higher requirements on the quality of electronic products, such as higher and higher requirements on the sound quality of products such as earphones and sound equipment, such as miniaturization, thinness, high sound quality and the like, and the effects depend on the core component of an acoustic device, namely the diaphragm of the acoustic device.
In the related art, in order to obtain a high-quality diaphragm, the material of the diaphragm is usually changed. Common vibrating diaphragm materials include cone paper, plastics, metal and the like, and the tone quality characteristic of the cone paper vibrating diaphragm is smooth and natural, clear and clear, but the cone paper vibrating diaphragm is easily influenced by the environment and has unstable performance. The metal diaphragm has strong rigidity, but the other side with strong rigidity has low internal loss, and energy can not be absorbed by the diaphragm material, so that when the basin is split, a very obvious resonance peak appears at the high end of frequency response, and metal sound easily appears. In addition, the metal material can increase the weight of the diaphragm, which is not favorable for the thinning and lightening development of the diaphragm. And the common diaphragm has poor rigidity and poor high-low frequency performance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a diaphragm and a coating method thereof aiming at the defects of poor rigidity and poor high-low frequency performance of the common diaphragm in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a diaphragm comprising:
comprises a substrate layer, a strengthening layer and a glue layer coated on the surface of the strengthening layer, wherein,
the substrate layer is a film made of any one of polyetherimide, polyethylene terephthalate, polyether ether ketone, polyphenylene sulfide and polyurethane;
the strengthening layer is prepared by uniformly mixing graphene or a mixture of graphene and graphite powder through a diluent, wherein,
the weight ratio of the graphene to the diluent is (5-10) to (9995-9990);
the weight ratio of the graphite powder, the graphene and the diluent is (5-10): 9990-9980;
and the glue layer is coated on the surface of the strengthening layer and completely covers the strengthening layer.
In the diaphragm, the thickness of the strengthening layer is preferably 0.5-1.5 μm.
The invention also provides a preparation method of the vibrating diaphragm, which comprises the following steps:
s1: providing a base material, graphene, graphite powder, a diluent and glue;
s2: adding the graphene or the mixture of the graphene and graphite powder into the diluent and uniformly mixing to form graphene suspension or graphene-graphite powder suspension;
s3: uniformly coating the graphene suspension or the graphene-graphite powder suspension on the surface of the substrate, and drying to form a strengthening layer, wherein the thickness of the strengthening layer is 0.5-1.5 mu m;
s4: and uniformly coating the glue on the surface of the strengthening layer and drying the glue to enable the glue to be solidified on the surface of the substrate to form a glue layer, wherein the glue completely covers the strengthening layer.
In the coating method of the diaphragm, it is preferable that before the step S3, the method further includes performing corona treatment on the surface of the substrate.
In the coating method of the diaphragm, preferably in the step S2, the weight ratio of the graphene to the diluent in the graphene suspension is (5-10): (9995-9990);
the weight ratio of the graphene to the graphite powder to the diluent in the graphene-graphite powder suspension is (5-10) to (9990-9980).
In the coating method of the diaphragm, the glue is preferably any one of polyurethane, vinyl fluoride, polyacrylate emulsion, vinyl acetate and ethylene-vinyl acetate.
In the coating method of the diaphragm, the thickness of the glue layer is preferably as follows.
In the coating method of the diaphragm, preferably, in step S3, the graphene suspension or the graphene-graphite powder suspension is uniformly coated on the surface of the base material in a slit coating manner.
In the coating method of the diaphragm, in step S3, the graphene suspension or the graphene-graphite powder suspension is preferably uniformly coated on the surface of the substrate by a screen coating method.
In the coating method of the diaphragm, the base material is preferably a film made of any one of polyetherimide, polyethylene terephthalate, polyether ether ketone, polyphenylene sulfide and polyurethane.
The diaphragm of the invention has the following beneficial effects: the vibrating diaphragm comprises a substrate layer, a reinforcing layer and a glue layer coated on the surface of the reinforcing layer, wherein the substrate layer is a thin film made of any one of materials of polyetherimide, polyethylene glycol terephthalate, polyether-ether-ketone, polyphenylene sulfide and polyurethane; the strengthening layer is prepared by uniformly mixing graphene or a mixture of graphene and graphite powder through a diluent, wherein the weight ratio of the graphene to the diluent is (5-10) to (9995-9990); the weight ratio of the graphite powder, the graphene and the diluent is (5-10): 9990-9980). According to the vibrating diaphragm, the graphene or the mixture of the graphene and the graphite powder is uniformly mixed by the diluent and then is uniformly coated on the surface of the substrate layer, so that the rigidity of the vibrating diaphragm is enhanced, and the high-frequency and low-frequency performances of the vibrating diaphragm are improved due to the adoption of the graphene.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a section of a diaphragm in which a reinforcing layer is graphene or graphene and graphite powder according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a coating method of a diaphragm according to an embodiment of the present invention;
FIG. 3 is a frequency response curve diagram of a diaphragm according to an embodiment of the present invention and a conventional diaphragm;
fig. 4 is an impedance curve diagram of a loudspeaker in which a diaphragm according to an embodiment of the present invention is assembled with a general diaphragm.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a diaphragm, which includes a substrate layer 100, a reinforcing layer 200, and a glue layer 300 coated on a surface of the reinforcing layer 200, wherein the glue layer 300 completely covers the reinforcing layer 200. The base material layer 100 is a film made of any one of polyetherimide, polyethylene terephthalate, polyether ether ketone, polyphenylene sulfide, and polyurethane. Preferably, the substrate layer 100 is a film made of polyethylene terephthalate, that is, a PET (polyethylene terephthalate) film is preferably used as a substrate of the diaphragm. The specific material is selected and determined according to the practical application, which is not limited in the present invention.
The strengthening layer 200 is prepared by uniformly mixing graphene or a mixture of graphene and graphite powder with a diluent, that is, the strengthening layer 200 may be prepared by uniformly mixing graphene with a diluent (as shown in fig. 1), or may be prepared by uniformly mixing a mixture of graphene and graphite powder with a diluent (as shown in fig. 1). It can be understood that in the strengthening layer 200, the graphene or the mixture of the graphene and the graphite powder is stirred uniformly by adding the diluent, so that the graphene is uniformly dispersed in the diluent. The diluent provided by the invention can be any one of ethyl acetate, toluene, xylene and butanone, and more preferably contains 5% of ethyl acetate. Compared with other materials, the ethyl acetate with the content of 5% is adopted as the diluent, so that the odor is low, and the method is economical and environment-friendly.
In the embodiment of the invention, if the strengthening layer 200 is prepared by uniformly mixing graphene with a diluent, the weight ratio of the graphene to the diluent is preferably (5-10): 9995-9990. If the strengthening layer 200 is prepared by uniformly mixing a mixture of graphene and graphite powder with a diluent, the weight ratio of the graphite powder to the graphene to the diluent is (5-10): 9990-9980.
It can be understood that, in the present invention, the graphite powder is added in the strengthening layer 200, because the graphite powder has good heat dissipation performance, and the diaphragm can generate high heat when vibrating, the addition of the graphite powder is helpful for the heat dissipation of the diaphragm, and when the diaphragm is applied to acoustic devices such as a loudspeaker, the bearing capacity of the loudspeaker can be improved. In addition, because the graphene has the characteristic of single atom rigidity, the rigidity of the graphene is strong, the overall performance is good, the characteristic of the vibrating diaphragm can be changed by adding the graphene into the strengthening layer 200, so that the vibrating diaphragm can achieve the high-frequency performance of metal plating, and simultaneously can achieve the better low-frequency performance, the high-frequency performance and the low-frequency performance of the vibrating diaphragm are improved, and meanwhile, the graphene can be directly contacted with the surface of the substrate, so that the rigidity of the formed vibrating diaphragm is better. Further, the thickness of the reinforcing layer 200 is preferably 0.5 to 1.5 μm, and more preferably 1 μm.
The diaphragm provided by the embodiment of the invention can be suitable for acoustic equipment such as a loudspeaker or a receiver and the like, has good high-low frequency characteristics and good rigidity, and the loudspeaker or the receiver adopting the diaphragm has good tone quality effect.
As shown in fig. 2, which is a flowchart of a coating method of a diaphragm provided in the present invention, the coating method includes the following steps:
s1: providing a base material, graphene, graphite powder, a diluent and glue.
In step S1, the base material is a film made of any one of polyetherimide, polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, and polyurethane. Polyethylene terephthalate (PET) is preferred.
The diluent can be any one of ethyl acetate, toluene, xylene and butanone, and more preferably the diluent comprises 5% of ethyl acetate. Compared with other materials, the ethyl acetate with the content of 5% is adopted as the diluent, so that the odor is low, and the method is economical and environment-friendly.
The glue is any one of polyurethane, vinyl fluoride, polyacrylate emulsion, vinyl acetate and ethylene-vinyl acetate, and preferably polyurethane.
S2: and adding the graphene or the mixture of the graphene and graphite powder into the diluent, and uniformly mixing to form a graphene suspension or a graphene-graphite powder suspension. It is understood that the graphene and the diluent can be mixed in different proportions in the graphene suspension, and the invention is not limited to the diluent as long as the graphene can be uniformly dispersed, and the weight ratio of the graphene to the diluent is preferably (5-10): 9995-9990). In the graphene-graphite powder suspension, the weight ratio of graphene to graphite powder to diluent is preferably (5-10) to (9990-9980).
S3: uniformly coating the graphene suspension or the graphene-graphite powder suspension on the surface of the substrate, and drying to form a strengthening layer 200, wherein the thickness of the strengthening layer 200 is 0.5-1.5 μm;
preferably, step S3 is preceded by performing corona treatment on the surface of the substrate. Before the surface of the film is coated with the graphene suspension or the graphene-graphite powder suspension, the surface of the film can be subjected to corona treatment to increase the adhesive force of the graphene suspension or the graphene-graphite powder suspension on the surface of the film and increase the adhesive force of the graphene or the graphene and the graphite powder coated on the surface of the film. Corona treatment is an electric shock treatment which provides higher adhesion of substances applied to its surface. The basic principle is that high-frequency high-voltage corona discharge (high-frequency alternating current voltage reaches 5000-. Further, since the graphene suspension or the graphene-graphite powder suspension is formed by uniformly mixing the diluent, the viscosity is low, and the coating fluidity is high, the coating speed is preferably 10-20 m/min, and more preferably 15m/min during coating. After the graphene suspension or the graphene or graphene-graphite powder suspension is uniformly coated on the surface of the substrate, a drying treatment is required to form the strengthening layer 200, in an embodiment of the present invention, an oven may be used for drying, the temperature may be set to 95-105 ℃, preferably 100 ℃, after the oven drying treatment, the graphene or the graphene and the graphite powder are uniformly dispersed and cured on the surface of the substrate, and the graphene or the graphene and the graphite powder cured on the surface of the substrate has no pressure-sensitive property.
Preferably, the thickness of the reinforcing layer 200 is 0.5 to 1.5 μm, and more preferably 1 μm.
Preferably, in the embodiment of the present invention, in step S3, the graphene suspension or the graphene-graphite powder suspension may be uniformly coated on the surface of the substrate layer by slit coating or by web coating. The slit coating or the reticulate pattern coating is adopted, so that the efficiency is high, and the thickness is uniform.
S4: and uniformly coating the glue on the surface of the strengthening layer 200, and drying to solidify the glue on the surface of the substrate layer to form a glue layer 300, wherein the glue completely covers the strengthening layer 200.
Further, the thickness of the glue layer 300 is preferably 0.5 to 1.5 μm, and preferably 1 μm.
Preferably, in the embodiment of the present invention, in step S4, glue may be uniformly coated on the surface of the reinforcing layer 200 by slot coating or by screen coating. The slit coating or the reticulate pattern coating is adopted, so that the efficiency is high, and the thickness is uniform.
In the embodiment of the invention, the graphene suspension or graphene-graphite powder suspension is uniformly coated on the surface of the film in a slit coating mode or a reticulate coating mode, compared with the existing spraying mode, the coating mode of the invention can ensure that the graphene has higher adhesiveness and better uniformity, and is uniformly cured on the surface of the film, and simultaneously, the graphene has stronger rigidity and good overall performance due to the characteristic that the graphene has rigidity of a single atom, so that the rigidity of the vibrating diaphragm can be enhanced. And the reinforcing layer 200 of the vibrating diaphragm is made of graphene materials, so that the high-frequency and low-frequency performance of the vibrating diaphragm can be improved.
The preparation of the strengthening layer 200 is illustrated by the following examples:
the strengthening layer 200 is prepared by uniformly mixing graphene with a diluent:
example 1
A. And mixing 5g of graphene and 9995g of diluent, mixing 5g of graphene into 9995g of diluent, and uniformly stirring to uniformly disperse the graphene in the diluent.
B. After the graphene is uniformly dispersed in the diluent, uniformly coating the formed graphene suspension on the surface (namely the surface of the film) of the substrate layer 100 by adopting a slit coating or anilox coating mode, wherein the coating speed is 20m/min, and the film coated with the graphene suspension on the surface is put into an oven to be dried, the temperature of the oven is set to be 100 ℃, and the drying time is set to be 2 min.
Example 2
A. And mixing 7g of graphene and 9993g of diluent, mixing 7g of graphene into 9993g of diluent, and uniformly stirring to uniformly disperse the graphene in the diluent.
B. After the graphene is uniformly dispersed in the diluent, uniformly coating the formed graphene suspension on the surface (namely the surface of the film) of the substrate layer 100 by adopting a slit coating or anilox coating mode, wherein the coating speed is 10m/min, and placing the film coated with the graphene suspension on the surface into an oven for drying, wherein the temperature of the oven is set to 95 ℃, and the drying time is set to 2 min.
Example 3
A. Mixing 10g of graphene and 9990g of diluent, mixing 10g of graphene into 9990g of diluent, and uniformly stirring to uniformly disperse the graphene in the diluent.
B. After the graphene is uniformly dispersed in the diluent, uniformly coating the formed graphene suspension on the surface (namely the surface of the film) of the substrate layer 100 by adopting a slit coating or anilox coating mode, wherein the coating speed is 15m/min, and placing the film coated with the graphene suspension on the surface into an oven for drying, wherein the temperature of the oven is set to be 105 ℃, and the drying time is set to be 2 min.
The strengthening layer 200 is prepared by uniformly mixing a mixture of graphene and graphite powder by a diluent:
example 4
A. The method comprises the steps of mixing a mixture of graphene and graphite powder in a diluent, taking 5g of graphene, 5g of graphite powder and 9990g of diluent, mixing 5g of graphene and 5g of graphite powder in 9990g of diluent, and uniformly stirring to uniformly disperse the graphene and the graphite powder in the diluent.
B. After the graphene and the graphite powder are uniformly dispersed in the diluent, uniformly coating the formed graphene-graphite powder suspension on the surface (namely the surface of the film) of the substrate layer 100 by adopting a slit coating or reticulate pattern coating mode, wherein the coating speed is 10m/min, and putting the film coated with the graphene suspension on the surface into an oven for drying, wherein the temperature of the oven is set to be 100 ℃, and the drying time is set to be 2 min.
Example 5
A. Mixing a mixture of graphene and graphite powder in a diluent, taking 7g of graphene, 7g of graphite powder and 9986g of diluent, mixing 7g of graphene and 7g of graphite powder in 9986g of diluent, and uniformly stirring to uniformly disperse the graphene and the graphite powder in the diluent.
B. After the graphene, the graphite powder and the diluent are uniformly dispersed in the diluent, uniformly coating the formed graphene-graphite powder suspension on the surface (namely the surface of the film) of the substrate layer 100 by adopting a slit coating or reticulate coating mode, wherein the coating speed is 15m/min, and putting the film coated with the graphene suspension on the surface into an oven for drying, wherein the temperature of the oven is set to be 95 ℃, and the drying time is set to be 2 min.
Example 6
A. The method comprises the steps of mixing a mixture of graphene and graphite powder in a diluent, taking 10g of graphene, 10g of graphite powder and 9980g of diluent, mixing 10g of graphene and 10g of graphite powder in 9980g of diluent, and uniformly stirring to uniformly disperse the graphene and the graphite powder in the diluent.
B. After the graphene and the graphite powder are uniformly dispersed in the diluent, uniformly coating the formed graphene-graphite powder suspension on the surface (namely the surface of the film) of the substrate layer 100 by adopting a slit coating or anilox coating mode, wherein the coating speed is 20m/min, and the film with the graphene suspension coated on the surface is put into an oven to be dried, the temperature of the oven is set to be 105 ℃, and the drying time is set to be 2 min.
The following performance tests were performed by comparing the conventional loudspeaker assembled with the diaphragm of the present invention (graphene is collectively referred to as graphene loudspeaker):
in the two schemes of adopting graphene or a mixture of graphene and graphite powder, the rigidity of the vibrating diaphragm is mainly improved by the rigid characteristic of a single atom of graphene, so that the influence effect of the two schemes on the vibrating diaphragm is the same, and the two schemes do not need to be compared with a common vibrating diaphragm independently during evaluation. The specific evaluation method comprises the following steps:
the frequency response of the diaphragms manufactured in embodiments 1 to 6 in the vibration process is evaluated to reflect the high and low frequency performance of the diaphragms. The method specifically comprises the following steps:
the prepared vibrating diaphragm is formed into a loudspeaker diaphragm and assembled into a finished product, namely the graphene loudspeaker, the graphene loudspeaker and a common loudspeaker are subjected to acoustic performance testing, a specific testing method is that a standard acoustic performance tester is adopted, the graphene loudspeaker and the common loudspeaker are tested simultaneously, the testing time is 10 minutes, corresponding data recording (including testing data of the vibrating diaphragms in the embodiments 1-6) is carried out, a corresponding frequency response curve graph is obtained according to the output of the acoustic performance tester, and as shown in fig. 3, an impedance curve graph of the graphene loudspeaker can be tested at the same time, and as shown in fig. 4.
According to the recorded data and the frequency response curve graph (shown in fig. 3), the high-frequency response curve of the graphene loudspeaker is 2-4 dB higher than that of the common loudspeaker (the high frequency band is 3000-40000 Hz), and the low-frequency response curve of the graphene loudspeaker is 3-6 dB higher than that of the common loudspeaker (the low frequency band is 20-50 Hz).
According to the impedance curve of the loudspeaker assembled by the diaphragm and the common diaphragm of the embodiment of the invention, as shown in fig. 4, the resonant frequency f of the graphene loudspeaker0550Hz, resonant frequency f of a common horn0700Hz, the low-frequency resonant frequency f of the graphene horn can be obtained0150Hz lower than that of a common horn.
According to the experimental results, the high-low frequency performance of the vibrating diaphragm is better, and the rigidity of the vibrating diaphragm is better because the graphene can be in direct contact with the base material.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (7)
1. A diaphragm is characterized by comprising a substrate layer, a strengthening layer and a glue layer coated on the surface of the strengthening layer,
the substrate layer is a film made of any one of polyetherimide, polyethylene terephthalate, polyether ether ketone, polyphenylene sulfide and polyurethane;
the strengthening layer is prepared by uniformly mixing a mixture of graphene and graphite powder with a diluent for reducing viscosity, wherein,
the weight ratio of the graphite powder, the graphene and the diluent is (5-10): 9990-9980;
the glue layer is coated on the surface of the strengthening layer and completely covers the strengthening layer;
the thickness of the strengthening layer is 0.5-1.5 μm.
2. A coating method of a diaphragm is characterized by comprising the following steps:
s1: providing a base material, graphene, graphite powder, a diluent and glue; the base material is a film made of any one of polyetherimide, polyethylene terephthalate, polyether-ether-ketone, polyphenylene sulfide and polyurethane;
s2: adding the mixture of the graphene and the graphite powder into the diluent, and uniformly mixing to form a graphene-graphite powder suspension; the weight ratio of the graphene to the graphite powder to the diluent in the graphene-graphite powder suspension is (5-10) to (9990-9980);
s3: uniformly coating the graphene-graphite powder suspension on the surface of the substrate, and drying to form a strengthening layer, wherein the thickness of the strengthening layer is 0.5-1.5 mu m;
s4: and uniformly coating the glue on the surface of the strengthening layer and drying the glue to enable the glue to be solidified on the surface of the substrate to form a glue layer, wherein the glue completely covers the strengthening layer.
3. The method for coating a diaphragm of claim 2, further comprising performing corona treatment on the surface of the substrate before step S3.
4. The method for coating a diaphragm of claim 2, wherein the glue is any one of polyurethane, vinyl fluoride, polyacrylate emulsion, vinyl acetate, and ethylene-vinyl acetate.
5. The coating method of the diaphragm according to claim 2, wherein the thickness of the glue layer is 0.5 to 1.5 μm.
6. The method for coating a diaphragm according to claim 2, wherein in step S3, the graphene-graphite powder suspension is uniformly coated on the surface of the substrate by slit coating.
7. The method for coating a diaphragm of claim 2, wherein in step S3, the graphene-graphite powder suspension is uniformly coated on the surface of the substrate by means of web coating.
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| PCT/CN2016/096778 WO2018023843A1 (en) | 2016-08-02 | 2016-08-25 | Vibration diaphragm and coating method thereof, and electroacoustic transducer |
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| CN108810754B (en) * | 2017-05-03 | 2021-12-03 | 常州阿木奇声学科技有限公司 | Vibrating diaphragm and manufacturing method thereof |
| CN107454544A (en) * | 2017-08-15 | 2017-12-08 | 深圳清华大学研究院 | A kind of diaphragm of loudspeaker preparation method based on graphene and PEI |
| CN109218924A (en) * | 2018-08-20 | 2019-01-15 | 歌尔股份有限公司 | Vibrating diaphragm, sounding device and its assemble method for sounding device |
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| CN204634038U (en) * | 2014-10-22 | 2015-09-09 | 李亚宁 | A kind of audio devices with compound voice diaphragm |
| CN204810529U (en) * | 2015-07-10 | 2015-11-25 | 瑞声光电科技(常州)有限公司 | Miniature loudspeaker diaphragm |
| CN105792077A (en) * | 2016-03-04 | 2016-07-20 | 歌尔声学股份有限公司 | Loudspeaker diaphragm, manufacturing method thereof and moving coil type loudspeaker |
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| CN204634038U (en) * | 2014-10-22 | 2015-09-09 | 李亚宁 | A kind of audio devices with compound voice diaphragm |
| CN204810529U (en) * | 2015-07-10 | 2015-11-25 | 瑞声光电科技(常州)有限公司 | Miniature loudspeaker diaphragm |
| CN105792077A (en) * | 2016-03-04 | 2016-07-20 | 歌尔声学股份有限公司 | Loudspeaker diaphragm, manufacturing method thereof and moving coil type loudspeaker |
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