Composite diaphragm of a sounding device, preparation method thereof, and sounding device

A sounding device and composite film technology, which is applied in the direction of polymer material diaphragm, planar diaphragm, chemical instrument and method, etc., can solve the problem of product yield reduction, diaphragm size change, single-layer ethylene-propylene rubber diaphragm sensitivity limitation, etc. Problems, achieve the effect of meeting the external dimensions, reducing warping deformation, and improving the difficulty of demoulding

Active Publication Date: 2021-01-22
GOERTEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the process of implementing the embodiment of the present application, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: (1) The nitrile rubber single-layer diaphragm product is easy to warp and deform, which causes the diaphragm size to change, and the flatness Deterioration, resulting in lower product yield; (2) The sensitivity of the single-layer ethylene-propylene rubber diaphragm is limited

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  • Composite diaphragm of a sounding device, preparation method thereof, and sounding device
  • Composite diaphragm of a sounding device, preparation method thereof, and sounding device
  • Composite diaphragm of a sounding device, preparation method thereof, and sounding device

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preparation example Construction

[0038] In a first aspect, a method for preparing a composite diaphragm of a sounding device is provided, comprising the following steps:

[0039] The nitrile rubber layer and the engineering plastic layer are combined to form a composite film;

[0040] The composite film is subjected to forming treatment to form a composite diaphragm, and in the forming process, the engineering plastic layer is pasted on the forming mold.

[0041] In the embodiment of the present application, the nitrile rubber layer is made of butadiene-acrylonitrile copolymer, wherein the mass of the acrylonitrile is 20-40% of the total amount of the butadiene-acrylonitrile copolymer , such as 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40%, and any value in between. In the present invention, the quality of the acrylonitrile is controlled to be 20-40% of the total amount of the butadiene-acrylonitrile copolymer, so that the diaphragm has good low-temperature resilience and chemical resistance at the same time. ...

Embodiment 1

[0084] Such as figure 1 As shown, a composite diaphragm of a sounding device is composed of an engineering plastic layer 101 and a nitrile rubber layer 102 stacked in sequence.

[0085] The preparation method of the composite diaphragm comprises the following steps:

[0086] S1. Laminating the nitrile rubber layer 102 and the engineering plastic layer 101 to form a composite film; wherein, the nitrile rubber layer 102 adopts a butadiene-acrylonitrile copolymer to make a film body through a calendering process, and the film body is an uncrosslinked rubber layer;

[0087] S2. Air pressure forming is performed on the composite film, and in the air pressure forming, the engineering plastic layer 101 is pasted on the forming mold, and the nitrile rubber layer 102 is located away from the engineering plastic layer 101. Forming mold side.

[0088] The thickness of the nitrile rubber layer 102 is 50 μm; the hardness of the nitrile rubber layer 102 is 50A.

[0089] The material of ...

Embodiment 2

[0091] Such as figure 2 As shown, a composite diaphragm of a sound generating device includes a first engineering plastic layer 201 , a nitrile rubber layer 202 and a second engineering plastic layer 203 stacked in sequence.

[0092] The preparation method of the diaphragm comprises the following steps:

[0093] S1. The first engineering plastic layer 201, the nitrile rubber layer 202 and the second engineering plastic layer 203 are pasted together to form a composite film; wherein, the nitrile rubber layer 202 adopts butadiene-acrylonitrile copolymer by coating process to make a membrane body, and dry the membrane body at a low temperature to form an uncrosslinked rubber layer or a semi-crosslinked rubber layer; the temperature of the low-temperature drying is 80°C;

[0094] S2. Perform compression molding on the composite film, and in the compression molding, attach the first engineering plastic layer 201 to a molding mold.

[0095] The thickness of the nitrile rubber lay...

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Abstract

The invention discloses a composite vibrating diaphragm of a sound production device and a preparation method thereof and the sound production device, and the preparation method comprises the following steps: compounding a nitrile rubber layer and an engineering plastic layer together to form a composite diaphragm; and forming the composite diaphragm to form a composite vibrating diaphragm, and inthe forming process, attaching the engineering plastic layer to a forming mold. According to the composite vibrating diaphragm, the nitrile rubber layer and the engineering plastic layer are compounded to form a composite structure, and the inventor accidentally finds that the composite structure generates functional complementation and synergistic interaction, so that an unexpected technical effect is achieved, and the sensitivity is effectively improved; and in the molding treatment of the composite diaphragm, the engineering plastic layer is attached to the molding die, so that the problemthat the single-layer diaphragm with the nitrile rubber layer is difficult to demold in the molding process is solved, the buckling deformation of the diaphragm product is reduced, and the boundary dimension of the diaphragm is ensured to meet the design and use requirements.

Description

technical field [0001] The invention relates to the field of acoustic products, in particular to a composite diaphragm of a sounding device, a preparation method thereof, and a sounding device. Background technique [0002] Sound generating devices are important acoustic devices in consumer electronics, which are used to convert electrical signals into sound. With the rapid development of consumer electronics products in recent years, consumers have higher and higher performance requirements for electronic products, and the application fields and environments of electronic products are becoming more and more complex. Under such application requirements, the performance of the sound generating device also needs to be improved. In the existing sound generating devices, the diaphragm is usually used as the element for vibrating and sounding. The diaphragm plays a vital role in the sound reproduction performance of the sound generating device, and it determines the conversion q...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04R7/10H04R31/00B32B25/16B32B25/08B32B27/28B32B27/34B32B27/36
CPCB32B25/08B32B25/16B32B27/28B32B27/34B32B27/36B32B27/365H04R7/10H04R31/003H04R2231/001H04R2307/025
Inventor周厚强闫付臻李春
OwnerGOERTEK INC