A manufacturing process of transparent diaphragm

Abstract

The invention discloses a transparent diaphragm and a manufacturing process thereof, and relates to the technical field of sound-generating devices; the transparent diaphragm comprises a shielding spray coating and a supporting layer, and the shielding spray coating is coated on the upper surface of the supporting layer; the shielding spray coating is a resin multilayer diaphragm formed by mixing PET resin, ester solvents, ketone solvents and aluminum-silver paste, or the shielding spray coating is a resin multilayer diaphragm formed by mixing PET resin, ester solvents, ketone solvents and copper-gold paste; the material of the supporting layer is any one of PET, PEN, PEI and PEEK; the beneficial effects of the invention are: improving the sound quality of mid- and high-frequency, showing good acoustic characteristics in the high-frequency range, and meeting market demand.

Description

Technical Field

[0001] The present invention relates to the technical field of sound-generating devices, and more specifically, to a manufacturing process for a transparent diaphragm. Background Art

[0002] In recent years, electronic devices such as mobile phones, laptops, electronic notepads, electronic clocks, digital cameras or game consoles usually have sound functions. Inside the shell of electronic devices with sound functions, there are sound-generating devices such as speakers and buzzers or microphone receiving parts. Existing products have extremely high requirements for sound quality, and the original single-layer PET / PEI / PEEK / PEN and other materials are difficult to meet market demand. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a process for manufacturing a transparent diaphragm, through which the sound quality of mid- and high-frequency sounds can be improved and good acoustic characteristics can be displayed.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a transparent diaphragm, which is improved in that it includes a shielding spray coating and a supporting layer, and the shielding spray coating is coated on the upper surface of the supporting layer; the shielding spray coating is a resin multilayer diaphragm formed by mixing PET resin, ester solvents, ketone solvents and aluminum silver paste, or the shielding spray coating is a resin multilayer diaphragm formed by mixing PET resin, ester solvents, ketone solvents and copper gold paste; the material of the supporting layer is any one of PET, PEN, PEI, and PEEK.

[0005] In the above structure, the thickness of the resin multilayer diaphragm is 2-4um.

[0006] In the above structure, the thickness of the resin multilayer diaphragm is 3um.

[0007] In addition, the present invention also proposes a process for manufacturing a transparent diaphragm, the improvement of which is that the process comprises the following steps:

[0008] A. Material selection and production of the support layer: any one of PET, PEN, PEI, and PEEK is selected as the material of the support layer, and the support layer is formed by heating and demolding on a demolding machine;

[0009] B. Preparation of the shielding spray coating: 70% PET resin, 10% ester solvent, 5% ketone solvent, and 15% copper-gold paste are selected according to the weight ratio, mixed and stirred evenly to form a mixture, and the mixture is sprayed multiple times with a spray gun to make the formed resin multilayer diaphragm adhere to the support layer, and the thickness of the resin multilayer diaphragm is controlled to be 2-4um, and the area ratio of the resin multilayer diaphragm to the support layer is 0.508:1; thereafter, the transparent diaphragm is heated in an oven and allowed to dry naturally;

[0010] C. Finished product test: stick 3M glue to the resin multilayer diaphragm on the spray-shielded surface of the transparent diaphragm and pull it. If the resin multilayer diaphragm does not fall off after 10 consecutive pulls, it is a qualified product, otherwise it is a defective product;

[0011] D. High and low temperature test: put the finished transparent diaphragm into a constant temperature and humidity tester for high and low temperature test, the test temperature is 65℃, humidity is 85%-90%, the test is continuous for 96 hours, after leaving it for 1 hour, observe, and use double-sided tape to remove the spray-shielded surface of the transparent diaphragm to ensure that there is no paint falling off; thereafter, put the transparent diaphragm into a constant temperature and humidity tester again for low temperature test, the test temperature is -30℃, humidity is 85%-90%, the test is continuous for 96 hours, after leaving it for 1 hour, observe, and use double-sided tape to remove the spray-shielded surface of the transparent diaphragm to ensure that there is no paint falling off;

[0012] E. Speaker test: install the transparent diaphragm into the speaker and test it. If there is no noise, short echo, or diaphragm defect, it is a good product, otherwise it is a defective product.

[0013] Furthermore, in the step A, if the selected material is PET, the heating temperature in the mold machine is 260°C-300°C; if the selected material is PEN, the heating temperature in the mold machine is 340°C-400°C; if the selected material is PEI, the heating temperature in the mold machine is 120°C-210°C; if the selected material is PEN, the heating temperature in the mold machine is 320°C-390°C.

[0014] Furthermore, in the step E, the outer diameter of the selected speaker is 50 mm, the rated impedance is 32Ω; the sweep speed is 3s-5s, the voltage is 0.8V / AC, and the resonant frequency of the audio signal is 50-10KHz.

[0015] The beneficial effect of the present invention is that the transparent diaphragm of the present invention has a significant improvement of 1-6dB for 2.5K-5KHz sounds and a significant improvement of 1-10dB for 7K-20KHz sounds, thereby improving the sound quality of mid- and high-frequency sounds, showing good acoustic characteristics in the high-frequency range, and meeting market demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the cross-sectional structure of a transparent diaphragm of the present invention.

[0017] Figure 2 The figure is a top view of a transparent diaphragm of the present invention.

[0018] Figure 3 The figure is a schematic diagram of a process for manufacturing a transparent diaphragm according to the present invention.

[0019] Figure 4 This is a diagram showing the acoustic characteristics of a transparent diaphragm of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0022] Reference Figure 1As shown, the present invention discloses a transparent diaphragm. Specifically, the transparent diaphragm includes a spray-on coating 10 and a support layer 20. The spray-on coating 10 is coated on the upper surface of the support layer 20. In this embodiment, the spray-on coating 10 is a resin multilayer diaphragm formed by spraying a mixture of PET resin, ester solvents, ketone solvents and aluminum silver paste. Of course, in other embodiments, the spray-on coating 10 can also be a resin multilayer diaphragm formed by spraying a mixture of PET resin, ester solvents, ketone solvents and copper gold paste. The thickness of the resin multilayer diaphragm is 2-4um. Preferably, the thickness of the resin multilayer diaphragm is 3um, so as to take into account both waterproofness and sound permeability. The resin multilayer diaphragm can be subjected to coloring treatment, and the resin multilayer diaphragm mainly presents transparent white and egg yolk white. Therefore, the resin multilayer diaphragm is subjected to coloring treatment according to the color of the housing of the sound-generating device, thereby realizing a striking multilayer diaphragm configured on the housing. In addition, the resin multilayer diaphragm can be subjected to multi-liquid repellent treatment. In this case, a resin multilayer diaphragm with excellent water repellency and oil repellency can be realized. Such a resin multilayer diaphragm is suitable for use as a waterproof sound-transmitting diaphragm, etc. The liquid repellent treatment can be achieved by a known method, and the liquid repellent used in the liquid repellent treatment is not particularly limited, but is typically a material containing a polymer having a perfluoroalkyl group.

[0023] Furthermore, the support layer 20 plays a supporting role, and its material is any one of PET, PEN, PEI, and PEEK; that is, the material of the support layer 20 is preferably a thermal elastomer. For example, when the thermal elastomer is PET (polyethylene terephthalate), its chemical formula is COC6H4COOCH2CH2O, which is obtained by ester exchange of dimethyl terephthalate with ethylene glycol or esterification of terephthalic acid with ethylene glycol to synthesize dihydroxyethyl terephthalate, and then polycondensation reaction. It is a crystalline saturated polyester, a milky white or light yellow, highly crystalline polymer, with a smooth and shiny surface; it is a common resin in life, which can be divided into APET, RPET and PETG. For example, when the thermoplastic elastomer is PEI (polyetherimide), PEI is an amber transparent solid, has inherent flame retardancy and low smoke without any additives, has an oxygen index of 47%, a combustion grade of UL94-V-0, and a density of 1.28-1.42 g / cm 3PEI has strong high temperature stability, and even non-reinforced PEI still has good toughness and strength. When the thermoelastic is PEEK (polyetheretherketone), PEEK is a special engineering plastic with excellent performance. Compared with other special engineering plastics, it has more significant advantages, such as high temperature resistance of 260 degrees, excellent mechanical properties, good self-lubrication, chemical corrosion resistance, flame retardancy, peeling resistance, wear resistance, strong nitric acid, concentrated sulfuric acid resistance, radiation resistance, and super mechanical properties. It can be used in high-end machinery, nuclear engineering, aviation and other technologies. When the thermoelastic is PEN (polyethylene naphthalate), PEN is one of the important members of the polyester family, and is formed by the polycondensation of dimethyl 2,6-naphthalene dicarboxylate (NDC) or 2,6-naphthalene dicarboxylic acid (NDA) and ethylene glycol (EG), and is an emerging excellent polymer; its chemical structure is similar to that of PET, except that the PEN molecular chain has a more rigid naphthalene ring instead of the benzene ring in PET; the naphthalene ring structure enables PEN to have higher physical and mechanical properties, gas barrier properties, chemical stability, and heat resistance, UV resistance, radiation resistance and other properties than PET.

[0024] like Figure 3 As shown, in this embodiment, the present invention also discloses a process for manufacturing a transparent diaphragm, by which the above-mentioned transparent diaphragm can be manufactured. Specifically, the process for manufacturing the transparent diaphragm includes the following steps:

[0025] A. Material selection and production of the support layer 20: any one of PET, PEN, PEI and PEEK is selected as the material of the support layer 20, and the support layer 20 is formed by heating and demolding on a demolding machine;

[0026] In this embodiment, if the selected material is PET, the heating temperature in the demoulding machine is 260°C-300°C; if the selected material is PEN, the heating temperature in the demoulding machine is 340°C-400°C; if the selected material is PEI, the heating temperature in the demoulding machine is 120°C-210°C; if the selected material is PEN, the heating temperature in the demoulding machine is 320°C-390°C;

[0027] B. Preparation of the shielding spray coating: 70% PET resin, 10% ester solvent, 5% ketone solvent, and 15% copper-gold paste are selected according to the weight ratio, mixed and stirred evenly to form a mixture, and the mixture is sprayed multiple times with a spray gun to make the formed resin multilayer diaphragm adhere to the support layer, and the thickness of the resin multilayer diaphragm is controlled to be 2-4um, and the area ratio of the resin multilayer diaphragm to the support layer is 0.508:1; thereafter, the transparent diaphragm is heated in an oven and allowed to dry naturally;

[0028] C. Finished product test: stick 3M glue to the resin multilayer diaphragm on the spray-shielded surface of the transparent diaphragm and pull it. If the resin multilayer diaphragm does not fall off after 10 consecutive pulls, it is a qualified product, otherwise it is a defective product;

[0029] D. High and low temperature test: put the finished transparent diaphragm into a constant temperature and humidity tester for high and low temperature test, the test temperature is 65℃, humidity is 85%-90%, the test is continuous for 96 hours, after leaving it for 1 hour, observe, and use double-sided tape to remove the spray-shielded surface of the transparent diaphragm to ensure that there is no paint falling off; thereafter, put the transparent diaphragm into a constant temperature and humidity tester again for low temperature test, the test temperature is -30℃, humidity is 85%-90%, the test is continuous for 96 hours, after leaving it for 1 hour, observe, and use double-sided tape to remove the spray-shielded surface of the transparent diaphragm to ensure that there is no paint falling off;

[0030] E. Speaker test: install the transparent diaphragm into the speaker and conduct the test. If there is no noise, short echo, or bad diaphragm, it is a good product, otherwise it is a bad product. In this embodiment, the outer diameter of the selected speaker is 50mm, and the rated impedance is 32Ω; the sweep speed is 3s-5s, and the resonant frequency of the audio signal is 50-10KHz; through the test, a one-time test chart of the speaker frequency response curve is formed, at this time 1KHz±3dB, which meets the requirements; through the THD test, a one-time test chart of the speaker distortion is formed, at this time 1KHz≤1%, which meets the requirements.

[0031] like Figure 4 The figure shows the acoustic characteristic diagram of the diaphragm, wherein the broken line at the bottom is the acoustic characteristic line of the diaphragm when the shielding spray coating 10 is not sprayed, and the broken line at the top is the acoustic characteristic line after the shielding spray coating 10 is sprayed. Through testing and analysis, it is known that the transparent diaphragm of the present invention has a significant improvement of 1-6dB for the sound of 2.5K-5KHz and 1-10dB for the sound of 7K-20KHz, thereby improving the sound quality of mid- and high-frequency, showing good acoustic characteristics in the high-frequency range, and meeting the needs of the market.

[0032] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A process for manufacturing a transparent diaphragm, characterized in that: The process includes the following steps: A. Material selection and production of the support layer: any one of PET, PEN, PEI, and PEEK is selected as the material of the support layer, and the support layer is formed by heating and demolding on a demolding machine; B. Preparation of the shielding spray coating: 70% PET resin, 10% ester solvent, 5% ketone solvent, and 15% copper-gold paste are selected according to the weight ratio, mixed and stirred evenly to form a mixture, and the mixture is sprayed multiple times with a spray gun to make the formed resin multilayer diaphragm adhere to the support layer, and the thickness of the resin multilayer diaphragm is controlled to be 2-4um, and the area ratio of the resin multilayer diaphragm to the support layer is 0.508:1; thereafter, the transparent diaphragm is heated in an oven and allowed to dry naturally; C. Finished product test: stick 3M glue to the resin multilayer diaphragm on the spray-shielded surface of the transparent diaphragm and pull it. If the resin multilayer diaphragm does not fall off after 10 consecutive pulls, it is a qualified product, otherwise it is a defective product; D. High and low temperature test: put the finished transparent diaphragm into a constant temperature and humidity tester for high and low temperature test, the test temperature is 65℃, humidity is 85%-90%, the test is continuous for 96 hours, after leaving it for 1 hour, observe, and use double-sided tape to remove the spray-shielded surface of the transparent diaphragm to ensure that there is no paint falling off; thereafter, put the transparent diaphragm into a constant temperature and humidity tester again for low temperature test, the test temperature is -30℃, humidity is 85%-90%, the test is continuous for 96 hours, after leaving it for 1 hour, observe, and use double-sided tape to remove the spray-shielded surface of the transparent diaphragm to ensure that there is no paint falling off; E. Speaker test: install the transparent diaphragm into the speaker and test it. If there is no noise, short echo, or diaphragm defect, it is a good product, otherwise it is a defective product.

2. The process for manufacturing a transparent diaphragm according to claim 1, characterized in that: In the step A, if the selected material is PET, the heating temperature in the demolding machine is 260°C-300°C; if the selected material is PEN, the heating temperature in the demolding machine is 340°C-400°C; if the selected material is PEI, the heating temperature in the demolding machine is 120°C-210°C; if the selected material is PEN, the heating temperature in the demolding machine is 320°C-390°C.

3. The process for manufacturing a transparent diaphragm according to claim 1, characterized in that: In the step E, the outer diameter of the selected speaker is 50 mm, the rated impedance is 32Ω; the sweep speed is 3s-5s, the voltage is 0.8V / AC, and the resonant frequency of the audio signal is 50-10KHz.

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