WO2018023843A1

WO2018023843A1 - Vibration diaphragm and coating method thereof, and electroacoustic transducer

Info

Publication number: WO2018023843A1
Application number: PCT/CN2016/096778
Authority: WO
Inventors: 何朝阳; 易鹏飞; 孟献振
Original assignee: 常州阿木奇声学科技有限公司
Priority date: 2016-08-02
Filing date: 2016-08-25
Publication date: 2018-02-08

Abstract

The present invention relates to a vibration diaphragm and a coating method thereof, and an electroacoustic transducer. The vibration diaphragm comprises: a substrate layer, a strengthening layer, and an adhesive layer coated on the strengthening layer, wherein the substrate layer is a film manufactured using any one of a polyetherimide, polyethylene terephthalate, polyether ether ketone, polyphenylene sulfide, and polycarbamate material; the strengthening layer is manufactured by mixing a graphene, or a mixture of a graphene and graphite powder, with a diluting agent, wherein the weight ratio of the graphene and diluting agent is (5-10):(9995-9990); and the weight ratio of the graphene, graphite powder, and adhesive is (5-2):(5-10):(9990-9988). The adhesive layer is coated on a surface of the strengthening layer. The method comprises: adding a graphene, or a mixture of a graphene and graphite powder, into a diluting agent, and mixing evenly to form a graphene suspension or a graphene-graphite powder suspension; coating the graphene suspension or the graphene-graphite powder suspension on a surface of the strengthening layer; coating an adhesive on a surface of the strengthening layer and then baking to dryness. The invention provides strong vibrational rigidity, reduced resonance frequency f₀, increased high frequency sound pressure, and improved characteristics at high and low frequencies.

Description

Diaphragm and coating method thereof, electroacoustic transducer

[0001] The present invention relates to the technical field of acoustic diaphragms, and more particularly to a diaphragm and a coating method thereof, and an electroacoustic transducer.

Background technique

[0002] With the rapid development of science and technology, people have higher and higher requirements for the quality of electronic products, such as higher and higher sound quality requirements for products such as headphones and audio, such as miniaturization, thinning, and high sound quality requirements. These effects depend on the core components of the acoustic device, and the core component of the acoustic device is its diaphragm.

[0003] In the related art, in order to obtain a diaphragm of high sound quality, it is usually realized by changing the material of the diaphragm. Common diaphragm materials are paper cones, plastics, metals, etc. Usually, the sound quality of the paper cone diaphragm is smooth, clear and clear, but it is susceptible to environmental influences and unstable performance. The metal diaphragm is very rigid, but the other side with strong rigidity is low internal loss, and the energy is not absorbed by the diaphragm material itself. Therefore, in the case of basin splitting, there will be a distinct resonance peak appearing at the high end of the frequency response. It is easy to appear "metal sound". In addition, the metal material increases the weight of the diaphragm, which is not conducive to the thin and light development of the diaphragm. And the common common diaphragm has poor rigidity and poor performance at high and low frequencies.

technical problem

[0004] In the related art, in order to obtain a diaphragm of high sound quality, it is usually realized by changing the material of the diaphragm. Common diaphragm materials are paper cones, plastics, metals, etc. Usually, the sound quality of the paper cone diaphragm is smooth, clear and clear, but it is susceptible to environmental influences and unstable performance. The metal diaphragm is very rigid, but the other side with strong rigidity is low internal loss, and the energy is not absorbed by the diaphragm material itself. Therefore, in the case of basin splitting, there will be a distinct resonance peak appearing at the high end of the frequency response. It is easy to appear "metal sound". In addition, the metal material increases the weight of the diaphragm, which is not conducive to the thin and light development of the diaphragm. And the common common diaphragm has poor rigidity and poor performance at high and low frequencies.

Problem solution

Technical solution

[0005] The technical problem to be solved by the present invention is that the above-mentioned common diaphragms of the prior art have poor rigidity and high and low frequencies. A defect of poor performance, providing a diaphragm and a coating method thereof, and an electroacoustic transducer.

[0006] The technical solution adopted by the present invention to solve the technical problem thereof is: constructing a diaphragm, the diaphragm comprising:

[0007] comprising a substrate layer, a reinforcing layer, and a glue layer coated on a surface of the reinforcing layer, wherein

[0008] The substrate layer is a film made of any one of polyetherimide, polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, and polyurethane. ;

[0009] the strengthening layer is prepared by mixing graphene or a mixture of graphene and graphite powder through a diluent, wherein

[0010] The weight ratio of the graphene to the diluent is (5~10): (9995-9990);

[0011] The weight ratio of the graphite powder, graphene and diluent is (5~10): (5-10): (9990-9980);

[0012] The glue layer is coated on the surface of the strengthening layer, and the reinforcing layer is completely covered.

[0013] In the diaphragm, it is preferable that the thickness of the reinforcing layer is 0.5 to 1.5 μm.

[0014] The present invention also provides an electroacoustic transducer, the electroacoustic transducer comprising a magnetic circuit system, a vibration system coupled to the magnetic circuit system, wherein the vibration system includes the diaphragm, And a driving device that drives the diaphragm.

[0015] In the electroacoustic transducer, preferably, the magnetic circuit system is a moving iron magnetic circuit system or a moving coil magnetic circuit system.

[0016] In the electroacoustic transducer, preferably, the moving iron type magnetic circuit system includes an outer magnetic conductive plate, a magnet, an armature, a rotating shaft, and a coil.

[0017] In the electroacoustic transducer, preferably, the coil is provided with two coils and symmetrically distributed on both sides of the rotating shaft

The two coils are connected and the same direction of rotation.

[0018] In the electroacoustic transducer, preferably, the moving coil type magnetic circuit system includes a magnetic yoke, a magnet, and an iron core.

[0019] In the electroacoustic transducer, preferably, the driving device is a voice coil.

[0020] The present invention also provides a method for preparing a diaphragm, the method comprising the following steps:

[0021] S1: providing a substrate, graphene, graphite powder, a diluent, and a glue;

[0022] S2: adding the graphene or the mixture of the graphene and the graphite powder to the diluent to form a graphene suspension or a graphene-graphite powder suspension;

[0023] S3: uniformly coating the graphene suspension or the graphene-graphite powder suspension on the surface of the substrate to form a strengthening layer, wherein the reinforcing layer has a thickness of 0.5 to 1.5 μm _;

[0024] S4: uniformly coating the glue on the surface of the reinforcing layer and performing a drying process to cure the glue A glue layer is formed on the surface of the substrate, wherein the glue completely covers the reinforcement layer.

[0025] In the coating method of the diaphragm, it is preferable to further perform corona treatment on the surface of the substrate before the step S3.

[0026] 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);

[0027] The weight ratio of the graphene, graphite powder and diluent in the graphene-graphite powder suspension is (5~1)

0) : (5-10) : (9990-9980).

[0028] 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.

[0029] In the coating method of the diaphragm, the thickness of the glue layer is preferably.

[0030] In the coating method of the diaphragm, it is preferable that the graphene suspension or the graphene-graphite powder suspension is uniformly coated on the substrate by slit coating in the step S3. surface.

[0031] In the coating method of the diaphragm, it is preferable that the graphene suspension or the graphene-graphite powder suspension is uniformly coated on the surface of the substrate by using a screen coating method in the step S3. .

[0032] In the coating method of the diaphragm, the substrate is preferably polyetherimide, polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, polyurethane a film made of any one of the esters.

[0033] The present invention also provides an electroacoustic transducer comprising a magnetic circuit system, a vibration system coupled to the magnetic circuit system, wherein the vibration system comprises the above preparation method a diaphragm and a driving device for driving the diaphragm.

[0034] In the electroacoustic transducer, preferably, the magnetic circuit system is a moving iron magnetic circuit system or a moving coil magnetic circuit system.

[0035] In the electroacoustic transducer, preferably, the moving iron type magnetic circuit system includes an outer magnetic conducting plate, a magnet, an armature, a rotating shaft, and a coil.

[0036] In the electroacoustic transducer, preferably, the coil is provided with two coils and symmetrically distributed on both sides of the rotating shaft

The two coils are connected and the same direction of rotation.

[0037] In the electroacoustic transducer, preferably, the moving coil type magnetic circuit system includes a magnetic yoke, a magnet, and an iron core.

[0038] In the electroacoustic transducer, preferably, the driving device is a voice coil.

Advantageous effects of the invention

Beneficial effect [0039] The diaphragm of the present invention has the following advantageous effects: The diaphragm of the present invention is a diaphragm comprising a base layer, a reinforcing layer, and a three-layer structure of a glue layer coated on the surface of the reinforcing layer, wherein The substrate layer is a film made of any one of polyetherimide, polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, and polyurethane; the reinforcing layer is made of graphite. The mixture of ene or graphene and graphite powder is prepared by mixing with a diluent, wherein the weight ratio of graphene to diluent is (5~10): (9995-9990); graphite powder, graphene and thinner The weight ratio is (5~10) : (5-10) : (9990-9980). The invention uniformly coats the surface of the substrate layer by mixing the mixture of graphene or graphene and graphite powder through a diluent, and the structure enhances the rigidity of the diaphragm, and the vibration is improved by using graphene. High and low frequency performance of the film.

Brief description of the drawing

DRAWINGS

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic view showing the structure of a diaphragm of a graphene or graphene and graphite powder in an embodiment of the present invention;

2 is a schematic flow chart of a method for coating a diaphragm according to an embodiment of the present invention;

3 is a graph showing a frequency response curve of a diaphragm and a common diaphragm according to an embodiment of the present invention;

4 is an impedance curve diagram of a horn assembled with a diaphragm and a common diaphragm according to an embodiment of the present invention;

5 is a block diagram of an electroacoustic transducer according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0046] In order to more clearly understand the technical features, objects and advantages of the present invention, the specific embodiments of the present invention are described in detail with reference to the accompanying drawings.

As shown in FIG. 1 , the present invention provides a diaphragm including a substrate layer 100, a reinforcing layer 200, and a glue layer 300 coated on the surface of the reinforcing layer 200. The glue layer 300 is completely covered and strengthened. Layer 200. The base material layer 100 is a film made of any one of polyetherimide, polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, and polyurethane. Preferably, the substrate layer 100 is made of a film made of a polyethylene terephthalate material, that is, a PET (polyethylene terephthalate) film is preferably used as a substrate of the diaphragm. The specific material selection is determined according to the actual application, and the present invention does not limit this. [0048] The strengthening layer 200 is prepared by mixing graphene or a mixture of graphene and graphite powder through a diluent, that is, the strengthening layer 200 may be prepared by mixing graphene through a diluent (as shown in FIG. 1). ), can also be made by mixing a mixture of graphene and graphite powder through a diluent (as shown in Figure 1). Understandably

In the strengthening layer 200, the mixture of graphene or graphene and graphite powder is uniformly stirred by adding a diluent, so that the graphene is uniformly dispersed in the diluent. The diluent provided by the present invention may be any of ethyl acetate, toluene, xylene, and methyl ketone, and more preferably includes 5% of ethyl acetate. The use of ethyl acetate including 5% as a diluent is low in odor compared to other materials and economical.

[0049] In the embodiment of the present invention, if the reinforcing layer 200 is prepared by mixing graphene through a diluent, the weight ratio of graphene to diluent is preferably ( ₅ to 10): (9995-9990). If the strengthening layer 200 is prepared by mixing a mixture of graphene and graphite powder through a diluent, the weight ratio of graphite powder, graphene to diluent is (5-10) : (5-10) : (9990- 9980).

[0050] It can be understood that, in the present invention, graphite powder is added to the strengthening layer 200. Since the graphite powder has better heat dissipation performance, and the diaphragm generates high heat after vibration, the addition of the graphite powder contributes to the diaphragm. Heat dissipation, when the diaphragm is applied to an acoustic device such as a speaker, the horn can be increased. In addition, since graphene has the characteristics of single atomic rigidity, graphene has strong rigidity and good overall performance. Adding graphene to the strengthening layer 200 can change the characteristics of the diaphragm and make the diaphragm reach the metal-plated high frequency. The performance, the same can achieve better low-frequency performance, improve the high-low frequency performance of the diaphragm, and the same graphene can directly contact the surface of the substrate, so that the formed diaphragm is more rigid. Further, the thickness of the reinforcing layer 200 is preferably 0.5 to 1.5 μm, more preferably 1 μm.

[0051] The diaphragm provided in the embodiment of the present invention can be applied to an acoustic device such as a speaker or a receiver, has good high and low frequency characteristics and good rigidity, and the sound quality of the speaker or receiver using the diaphragm of the present invention The effect is good.

[0052] As shown in FIG. 2, it is a flowchart of a method for coating a diaphragm provided by the present invention, the coating method comprising the following steps:

[0053] S1: providing a substrate, graphene, graphite powder, a diluent, and a glue.

[0054] In step S1, the substrate is made of any one of polyetherimide, polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, and polyurethane. Film. Preferred polyethylene terephthalate (Ρ ET).

The diluent may be any one of ethyl acetate, toluene, xylene, and butanone, and more preferably includes ethyl acetate in an amount of 5%. The use of ethyl acetate containing 5% as a diluent is less odorous and economical than other materials.

[0056] The glue is any one of polyurethane, vinyl fluoride, polyacrylate emulsion, vinyl acetate, and ethylene vinyl acetate, preferably polyurethane.

[0057] S2: adding the graphene or the mixture of the graphene and the graphite powder to the diluent and uniformly forming a graphene suspension or a graphene-graphite powder suspension. It is to be understood that the graphene and the diluent may be mixed in different ratios in the graphene suspension. In the present invention, as long as the diluent for uniformly dispersing the graphene is applicable to the present invention, the present invention is not limited thereto. In the present invention, the weight ratio of graphene to diluent is preferably (5~10): (9995-9990). In the graphene-graphite powder suspension, the weight ratio of graphene, graphite powder to diluent is preferably (5~10) : (5-10) : (9990-9980).

[0058] S3: uniformly coating the graphene suspension or the graphene-graphite powder suspension on the surface of the substrate to form a strengthening layer 200, wherein the thickness of the strengthening layer 200 is 0.5~ 1.5μηι _;

[0059] Preferably, before the step S3, the surface of the substrate is subjected to corona treatment. That is, before coating the surface of the film with a graphene suspension or a graphene-graphite powder suspension, the surface of the film may be corona treated to increase the graphene suspension or the graphene-graphite powder suspension on the surface of the film. Adhesion, increase the adhesion of graphene or graphene to graphite powder coated on the surface of the film. Corona treatment is an electric shock treatment which allows a substance coated on its surface to have higher adhesion. The basic principle is to use a high frequency and high voltage to corona discharge on the surface of the treated plastic (high frequency AC voltage up to 5000-15000V/m2), and generate a low temperature plasma to generate a radical reaction on the plastic surface to cause the polymer to cross. The surface becomes rough and increases its wettability to polar solvents - these ions destroy the molecular structure by electric shock and penetration into the surface of the substrate, which in turn oxidizes and polarizes the surface molecules being treated, and ion shocks The surface, so as to increase the adhesion of the surface of the substrate. Further, since the graphene suspension or the graphene-graphite powder suspension is formed by mixing with a diluent, the viscosity is relatively small, and the fluidity of the coating is strong, and therefore, the coating speed is coated. It is preferably 10 to 20 m/min, more preferably 15 m/min. The graphene suspension or the graphene or graphene-graphite powder suspension is uniformly coated on the surface of the substrate and then subjected to a drying treatment to form the strengthening layer 200. In the embodiment of the present invention, the oven may be used for drying, and the temperature may be set. 95 ° C ~105 ° C, preferably 100 ° C, after drying in an oven, graphene or graphene and graphite powder are uniformly dispersed and solidified on the surface of the substrate, and the graphene or graphene and graphite powder solidified on the surface of the substrate are pressureless. Sensitivity

[0060] 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, the graphene suspension or the graphene-graphite powder suspension may be uniformly coated by using a slit coating method or a screen coating method in step S3. On the surface of the substrate layer. The method of slit coating or textured coating is high in efficiency and uniform in thickness.

[0062] S4: uniformly coating the glue on the surface of the strengthening layer 200 and performing a drying process to cure the glue to form a glue layer 300 on the surface of the substrate layer, wherein the glue completely covers the glue layer Strengthening layer 200

[0063] Further, the thickness of the glue layer 300 is preferably 0.5 to 1.5 μm, preferably 1 μm.

[0064] Preferably, in the embodiment of the present invention, the glue may be uniformly coated on the surface of the reinforcing layer 200 by a slit coating method or a mesh coating method in the step S4. The use of slit coating or textured coating is efficient and uniform in thickness.

[0065] In the embodiment of the present invention, the graphene suspension or the graphene-graphite powder suspension is uniformly coated on the surface of the film by slit coating or by net coating, and existing Compared with the spraying method, the coating method of the invention can make the graphene have higher adhesion, better uniformity, and the graphene is uniformly solidified on the surface of the film, and the graphene itself has the characteristics of single atom rigidity. Therefore, graphene has high rigidity and good overall performance, thereby enhancing the rigidity of the diaphragm. Moreover, the reinforcing layer of the diaphragm is made of graphene material, which can also improve the high and low frequency performance of the diaphragm.

As shown in FIG. 5, the present invention also provides an electroacoustic transducer comprising a magnetic circuit system 1, a vibration system 2 connected to the magnetic circuit system 1.

[0067] The magnetic circuit system 1 includes a moving iron type magnetic circuit system or a moving coil type magnetic circuit system.

[0068] Specifically, the moving iron magnetic circuit system includes a magnetic conductive plate, a magnet, an armature, a rotating shaft, and a coil. There are two coils, two coils are symmetrically distributed on both sides of the rotating shaft and the two coils are connected, and the two coils have the same direction of rotation. In the practice of the present invention, setting the coils to two can effectively ensure that the induced magnetic field strengths at both ends of the armature are the same, thereby reducing harmonic distortion.

[0069] The moving coil magnetic circuit system includes a magnetic yoke, a magnet, and an iron core. [0070] In an embodiment of the invention, the vibration system 2 includes a diaphragm and a driving device that drives the diaphragm.

In the present embodiment, the diaphragm in the vibration system 2 includes a base material layer 100, a reinforcing layer 200, and a glue layer 300 coated on the surface of the reinforcing layer 200, and 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, polyetheretherketone, polyphenylene sulfide, and polyurethane. Preferably, the substrate layer 100 is made of a film made of a polyethylene terephthalate material, that is, a PET (polyethylene terephthalate) film is preferable as a substrate of the diaphragm. The specific selection is determined according to the actual application, and the present invention does not limit this.

[0072] The strengthening layer 200 is prepared by mixing graphene or a mixture of graphene and graphite powder through a diluent, that is, the strengthening layer 200 may be prepared by mixing graphene through a diluent (as shown in FIG. 1). ), can also be made by mixing a mixture of graphene and graphite powder through a diluent (as shown in Figure 1). Understandably

[0073] It can be understood that, in the present invention, graphite powder is added to the strengthening layer 200, since the graphite powder has better heat dissipation performance, and the diaphragm can generate high heat after vibration, the graphite powder is added to help the diaphragm. Heat dissipation, when the diaphragm is applied to an acoustic device such as a speaker, the horn can be increased. In addition, since graphene has the characteristics of single atomic rigidity, graphene has strong rigidity and good overall performance. Adding graphene to the strengthening layer 200 can change the characteristics of the diaphragm and make the diaphragm reach the metal-plated high frequency. The performance, the same can achieve better low-frequency performance, improve the high-low frequency performance of the diaphragm, and the same graphene can directly contact the surface of the substrate, so that the formed diaphragm is more rigid. Further, the thickness of the reinforcing layer 200 is preferably 0.5 to 1.5 μm, more preferably 1 μm.

[0074] In the electroacoustic transducer of the present invention, the driving device is preferably a voice coil. In the embodiment of the invention, the graphene material is used, and the excellent thermal conductivity of the graphene material can be utilized to quickly dissipate heat generated by the voice coil, prevent heat accumulation at the voice coil and cause damage to the voice coil, and improve the electroacoustic transduction. The heat dissipation effect of the device further extends the life of the electroacoustic transducer. By the diaphragm of the present invention, the resonance frequency can be lowered, the high-frequency sound pressure can be increased, and the high-low frequency characteristics can be improved. Therefore, the electroacoustic transducer using the diaphragm has a resonance frequency f. Low, high frequency sound pressure, better high and low frequency performance, and stronger rigidity.

[0075] It will be appreciated that the electroacoustic transducer of the present invention may be a receiver, a speaker or the like.

[0076] The preparation of the strengthening layer 200 is exemplified below by a number of embodiments:

[0077] The strengthening layer 200 is prepared by mixing graphene through a diluent:

Embodiment 1

[0079] A, graphene is mixed into the diluent, and 5 g of graphene and 9995 g of a diluent are taken. 5 g of graphene is put into 9995 g of the diluent, and the mixture is uniformly stirred to uniformly disperse the graphene in the diluent.

[0080] B. After the graphene is uniformly dispersed in the diluent, the graphene suspension formed by the graphene is uniformly coated on the surface of the substrate layer 100 (ie, the surface of the film) by slit coating or textured coating. The coating speed was 20 m/min, and the film having the surface coated with the graphene suspension was placed in an oven for drying, the oven temperature was set to 100 ° C, and the drying time was set to 2 min.

Example 2

A. Graphene is mixed into the diluent, and 7 g of graphene and 9993 g of a diluent are taken. 7 g of graphene is put into 9993 g of the diluent, and the mixture is uniformly stirred to uniformly disperse the graphene in the diluent.

[0083] B. After the graphene is uniformly dispersed in the diluent, the graphene suspension formed by the graphene is uniformly coated on the surface of the substrate layer 100 (ie, the surface of the film) by slit coating or textured coating. The coating speed was 10 m/min, and the film having the surface coated with the graphene suspension was placed in an oven for drying, the oven temperature was set to 95 ° C, and the drying time was set to 2 min.

Example 3

A. Graphene is mixed into the diluent, and 10 g of graphene and 9990 g of a diluent are taken. 10 g of graphene is put into 9990 g of the diluent, and the mixture is uniformly stirred to uniformly disperse the graphene in the diluent.

[0086] B. After the graphene is uniformly dispersed in the diluent, the graphene suspension formed by the graphene is uniformly coated on the surface of the substrate layer 100 (ie, the surface of the film) by slit coating or textured coating. The coating speed was 15 m/min, and the film having the surface coated with the graphene suspension was placed in an oven for drying, the oven temperature was set to 105 ° C, and the drying time was set to 2 min.

[0087] The strengthening layer 200 is prepared by mixing a mixture of graphene and graphite powder through a diluent:

Embodiment 4

[0089] A, a mixture of graphene and graphite powder is mixed into the diluent for mixing, taking graphene 5g, graphite powder 5g , diluent 9990g, 5g graphene, 5g graphite powder into the 9990g diluent, stir evenly, so that graphene and graphite powder are evenly dispersed in the diluent.

[0090] B. After the graphene and the graphite powder are uniformly dispersed in the diluent, the graphene-graphite powder suspension formed by the graphene and the graphite powder is uniformly coated on the substrate layer 100 by slit coating or textured coating. Surface (ie film surface)

The coating speed was 10 m/min, and the film having the surface coated with the graphene suspension was placed in an oven for drying, the oven temperature was set to 100 ° C, and the drying time was set to 2 min.

Example 5

[0092] A, a mixture of graphene and graphite powder is mixed into the diluent to mix, taking 7g of graphene, 7g of graphite powder, 9986g of diluent, 7g of graphene, 7g of graphite powder into the 9986g thinner, stirring evenly , uniformly disperse graphene and graphite powder in the diluent.

[0093] B. After the graphene and the graphite powder and the diluent are uniformly dispersed in the diluent, the graphene-graphite powder suspension formed by the graphene and the graphite powder is uniformly coated on the base by slit coating or mesh coating. The surface of the layer 100 (ie, the surface of the film), the coating speed is 15 m / min, and the film coated with the graphene suspension on the surface is placed in an oven for drying, the oven temperature is set to 95 ° C, dry daytime Set to 2min.

Example 6

[0095] A, a mixture of graphene and graphite powder is mixed into the diluent to mix, 10 g of graphene, 10 g of graphite powder, 9980 g of diluent, 10 g of graphene, 10 g of graphite powder into 9980 g of diluent, stirring Uniformly, the graphene and graphite powder are uniformly dispersed in the diluent.

[0096] B. After the graphene and the graphite powder are uniformly dispersed in the diluent, the graphene-graphite powder suspension formed by the graphene and the graphite powder is uniformly coated on the substrate layer 100 by slit coating or textured coating. Surface (ie film surface)

The coating speed was 20 m/min, and the film having the surface coated with the graphene suspension was placed in an oven for drying, the oven temperature was set to 105 ° C, and the drying time was set to 2 min.

[0097] The ordinary horn assembled by the existing diaphragm is compared with the horn assembled by the diaphragm of the present invention (graphene collectively referred to as a lithene horn), and the following performance tests are performed:

[0098] In the two schemes of using graphene or a mixture of graphene and graphite powder, the rigidity of the single atom of graphene is mainly improved, thereby improving the rigidity of the diaphragm, so the effect of the two schemes on the diaphragm is the same. Evaluation does not require a separate comparison with the common diaphragm. Specific evaluation method:

[0099] The frequency response of the diaphragm made in Examples 1 to 6 during the vibration process was evaluated to reflect the level of the diaphragm. Frequency performance. Specifically:

[0100] The prepared diaphragm is formed into a horn diaphragm, and assembled into a finished product, that is, the graphene horn described above, and the graphene horn and the ordinary horn are subjected to acoustic performance test, and the specific test method is to adopt a standard method. Acoustic performance tester, the graphene speaker is tested with the ordinary speaker, the test time is 10 minutes, and the corresponding data record (including the test data of the diaphragm of the embodiment 1~6), according to the acoustic performance tester The output obtains the corresponding frequency response curve. As shown in Figure 3, the impedance curve of the graphene speaker can be tested, as shown in Figure 4.

[0101] According to the recorded data and the frequency response curve (shown in FIG. 3 ), the high frequency frequency response curve of the graphene speaker is 2 to 4 dB higher than that of the ordinary speaker (the high frequency band is 3000 to 40,000 Hz), and the low frequency response thereof. The curve is 3~6dB higher than the normal speaker (the low frequency band is 20~50Hz).

[0102] The impedance curve of the horn assembled with the diaphragm and the common diaphragm according to the embodiment of the present invention, as shown in FIG. 4, the resonance frequency f of the graphene horn. For 550Hz, the resonant frequency of the ordinary speaker f. 700Hz, which is available

, the low frequency resonant frequency of the graphene speaker f. 150Hz lower than the normal speaker.

[0103] From the above experimental results, it is understood that the diaphragm of the present invention has better high-low frequency performance, and since the graphene can be in direct contact with the substrate, the rigidity of the diaphragm is better.

The above embodiments are merely illustrative of the technical concept and the features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention without limiting the scope of the present invention. All changes and modifications made within the scope of the claims of the present invention are intended to be included within the scope of the appended claims.

[0105] It is to be understood that those skilled in the art can devise modifications or variations in accordance with the above description, and all such modifications and changes are intended to be included within the scope of the appended claims.

Claims

Claim

[Claim 1] A diaphragm comprising a base material layer, a reinforcing layer, and a glue layer coated on a surface of the reinforcing layer, wherein

The substrate layer is a film made of any one of polyetherimide, polyethylene terephthalate, polyetheretherketone, polyphenylene sulfide, and polyurethane; The reinforcing layer is prepared by 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): (9995-9990);

The weight ratio of the graphite powder, graphene and diluent is (5~10) : (5-10) : (9990

-9980);

The glue layer is coated on the surface of the reinforcing layer, and the reinforcing layer is completely covered.

[Claim 2] The diaphragm according to claim 1, wherein the reinforcing layer has a thickness of 0.5 to 1.

[Claim 3] A method of coating a diaphragm, wherein the coating method comprises the following steps:

S1: providing a substrate, graphene, graphite powder, thinner and glue;

S2: adding the graphene or the mixture of the graphene and the graphite powder to the diluent, and uniformly forming a graphene suspension or a graphene-graphite powder suspension;

S3: uniformly coating the graphene suspension or the graphene-graphite powder suspension on the surface of the substrate to form a strengthening layer, wherein the reinforcing layer has a thickness of 0.5 to 1.5 μ.

S4: uniformly coating the glue on the surface of the reinforcing layer and performing a drying process to cure the glue to form a glue layer on the surface of the substrate, wherein the glue completely covers the strengthening layer.

[Claim 4] The method of coating a diaphragm according to claim 3, further comprising performing a corona treatment on the surface of the substrate before the step S3.

[Claim 5] The method of coating a diaphragm according to claim 3, wherein in the step S2, a weight ratio of the graphene to the diluent in the graphene suspension For (5~10): (9995-9990); The weight ratio of the graphene, graphite powder and diluent in the graphene-graphite powder suspension is (5-10) : (5-10) : (9990-9980).

[Claim 6] The method of coating a diaphragm according to claim 3, wherein the glue is any one of polyurethane, vinyl fluoride, polyacrylate emulsion, vinyl acetate, and ethylene vinyl acetate. Kind.

The method of coating a diaphragm according to claim 3, wherein the thickness of the glue layer is 0.5 to 1.5 μm.

[Claim 8] The method of coating a diaphragm according to claim 3, wherein the graphene suspension or the graphene-graphite powder is suspended by slit coating in the step S3. The liquid is uniformly coated on the surface of the substrate.

[Claim 9] The method for coating a diaphragm according to claim 3, wherein the graphene suspension or the graphene-graphite powder suspension is used in the step S3 by means of a textured coating. Evenly coated on the surface of the substrate.

The method of coating a diaphragm according to claim 3, wherein the substrate is made of polyetherimide, polyethylene terephthalate, polyetheretherketone, A film made of any one of polyphenylene sulfide and polyurethane.

[Claim 11] An electroacoustic transducer comprising: a magnetic circuit system, a vibration system coupled to the magnetic circuit system, wherein the vibration system comprises the diaphragm of claim 1 or 2. And a driving device for driving the diaphragm.

[Claim 12] The electroacoustic transducer according to claim 11, wherein the magnetic circuit system is a moving iron type magnetic circuit system or a moving coil type magnetic circuit system.

[Claim 13] The electroacoustic transducer according to claim 12, wherein the moving iron type magnetic circuit system includes an outer magnetic conducting plate, a magnet, an armature, a rotating shaft, and a coil.

[Attachment 14] The electroacoustic transducer according to claim 13, wherein the coil is provided with two and symmetrically distributed on both sides of the rotating shaft, and the two coils are connected, and The direction of rotation is the same.

[Claim 15] The electroacoustic transducer according to claim 12, wherein the moving coil type magnetic circuit system includes a magnetic yoke, a magnet, and an iron core.

[Claim 16] The electroacoustic transducer according to claim 11, wherein the driving device is a voice coil.

[Claim 17] An electroacoustic transducer, comprising: a magnetic circuit system, a vibration system coupled to the magnetic circuit system, wherein the vibration system comprises any one of claims 3 to The diaphragm produced by the preparation method and the driving device for driving the diaphragm.

The electroacoustic transducer according to claim 17, wherein the magnetic circuit system is a moving iron type magnetic circuit system or a moving coil type magnetic circuit system.

[Claim 19] The electroacoustic transducer according to claim 18, wherein the moving iron type magnetic circuit system includes an outer magnetic conducting plate, a magnet, an armature, a rotating shaft, and a coil.

[Claim 20] The electroacoustic transducer according to claim 19, wherein the coil is provided with two and symmetrically distributed on both sides of the rotating shaft, and the two coils are connected, and The direction of rotation is the same.

[Claim 21] The electroacoustic transducer according to claim 18, wherein the moving coil type magnetic circuit system includes a magnetic yoke, a magnet, and an iron core.

[Claim 22] The electroacoustic transducer according to claim 17, wherein the driving device is a voice coil.