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A kind of diaphragm and its preparation method, sounding device

A technology of rubber film and composite film, which is applied in the direction of planar diaphragm, lamination device, chemical instrument and method, etc., can solve problems such as difficulty in demoulding, achieve the effects of improving difficulty in demoulding, satisfying external dimensions, and improving intermediate frequency sensitivity

Active Publication Date: 2022-03-15
GOERTEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to make up for the defects of the prior art, the main purpose of the present invention is to propose a vibrating membrane of a sounding device and its preparation method, and a sounding device, so as to improve the problem of difficult demoulding of an ethylene-vinyl acetate rubber single-layer vibrating membrane during the molding process. , reduce the deformation of the diaphragm when it is demoulded, ensure that the external dimensions of the diaphragm meet the design and use requirements, and effectively improve the sensitivity of the intermediate frequency and reduce the split vibration

Method used

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  • A kind of diaphragm and its preparation method, sounding device
  • A kind of diaphragm and its preparation method, sounding device
  • A kind of diaphragm and its preparation method, sounding device

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preparation example Construction

[0051] The second aspect provides a method for preparing the diaphragm of the sound emitting device in the first aspect, comprising the following steps:

[0052] Combine the rubber layer and the engineering plastic layer together to form a composite film;

[0053] Air pressure or compression molding is performed on the composite film, and in the air pressure or compression molding, the engineering plastic layer is pasted on the forming mold, and the rubber layer is placed on the engineering plastic layer.

[0054] In the embodiment of the present application, the preparation of the rubber layer is as follows: a film body is formed by a film forming process, and the film body is dried at a low temperature to form an uncrosslinked rubber layer or a semi-crosslinked rubber layer.

[0055] In the embodiment of the present application, the film forming process is not particularly limited, and a film forming process well known to those skilled in the art may be used. Preferably, th...

Embodiment 1

[0077] Such as figure 1 As shown, a vibrating membrane of a sounding device includes an engineering plastic layer 101 and a rubber layer 102 stacked in sequence, and the rubber layer 102 is made of ethylene-vinyl acetate rubber; the vibrating membrane is prepared by air pressure molding In the air pressure forming, the engineering plastic layer 101 is pasted on the forming mold.

[0078] The ethylene-vinyl acetate rubber is formed by copolymerization of ethylene and vinyl acetate, and the content of the vinyl acetate is 60% of the total amount of the ethylene-vinyl acetate rubber.

[0079] The thickness of the rubber layer 102 is 50 μm; the hardness of the rubber layer 102 is 60A; the dissipation factor of the rubber layer 102 is greater than 0.1 at room temperature.

[0080] The engineering plastic layer 101 is made of polyether ether ketone.

[0081]The thickness of the engineering plastic layer 101 is 5 μm.

Embodiment 2

[0083] Such as figure 2 As shown, a diaphragm of a sounding device includes a first engineering plastic layer 201, a rubber layer 202 and a second engineering plastic layer 203 stacked in sequence, and the rubber layer 202 is made of ethylene-vinyl acetate rubber; The diaphragm is prepared by air pressure forming, and in the air pressure forming, the first engineering plastic layer 201 is pasted on the forming mold.

[0084] The ethylene-vinyl acetate rubber is formed by copolymerization of ethylene and vinyl acetate, and the content of the vinyl acetate is 40% of the total amount of the ethylene-vinyl acetate rubber.

[0085] The thickness of the rubber layer 202 is 30 μm; the hardness of the rubber layer 202 is 30A; the dissipation factor of the rubber layer 202 is greater than 0.1 at room temperature.

[0086] The material of the first engineering plastic layer 201 is polyether ether ketone, and the material of the second engineering plastic layer 203 is polyether ether k...

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Abstract

The invention discloses a vibrating membrane, a preparation method thereof and a sounding device, comprising at least one rubber layer and at least one engineering plastic layer, the rubber layer is made of ethylene-vinyl acetate rubber; the vibrating membrane is made of air pressure or compression molding, and in the air pressure or compression molding, the engineering plastic layer is attached to the molding mold, which not only ensures the excellent high temperature resistance, ozone resistance and aging resistance of the rubber layer itself, It also effectively improves the sensitivity of the intermediate frequency and reduces the split vibration; and the diaphragm is prepared by air pressure or compression molding, and in the air pressure or compression molding, the engineering plastic layer is attached to the molding mold, so The above-mentioned rubber layer is placed on the engineering plastic layer. Through the above-mentioned arrangement, the problem of difficult demoulding of the ethylene-vinyl acetate rubber single-layer diaphragm during the molding process is improved, the deformation amount of the diaphragm when demoulding is reduced, and the vibration diaphragm is ensured. The dimensions of the membrane meet the design and use requirements.

Description

technical field [0001] The invention relates to the field of acoustic products, in particular to a diaphragm, a preparation method thereof, and a sound generating device. Background technique [0002] With the rapid development of electronic information technology, more and more sound generating devices are applied to various electronic products, especially mobile communication equipment widely used by people. People not only care about its miniaturization and multi-function, but also require its voice effect High quality, no distortion. The diaphragm is the core component of the sound-generating device, and its design directly affects the performance of the acoustic device. [0003] The diaphragm of existing sounding devices mostly adopts ethylene-vinyl acetate rubber single-layer diaphragm, which has excellent high temperature resistance, ozone resistance and aging resistance, and the molded The diaphragm can still maintain excellent elasticity at high temperature, so it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R7/10B32B25/14B32B25/08B32B27/42B32B27/36B32B37/10
CPCH04R7/10B32B25/14B32B25/08B32B27/42B32B27/36B32B37/10B32B2307/306B32B2307/714
Inventor 闫付臻周厚强李春
Owner GOERTEK INC