Composite vibrating diaphragm of loudspeaker, preparation method of composite vibrating diaphragm and loudspeaker

Abstract

The invention discloses a composite diaphragm of a loudspeaker, a preparation method of the composite diaphragm and the loudspeaker. The preparation method comprises the following steps: compounding apolysulfide rubber layer and a thermoplastic elastomer layer together to form the composite diaphragm, forming the composite diaphragm to form a composite vibrating diaphragm, and in the forming process, attaching the thermoplastic elastomer layer to a forming mold. In the present invention, the polysulfide rubber layer and the thermoplastic elastomer layer form a composite structure, the inventor accidentally discovers that the composite structure generates function complementation and synergistic interaction, an unexpected technical effect is achieved, the problem that the polysulfide rubber single-layer vibrating diaphragm is easily attached to a mold in the forming process and consequently demolding is difficult can be solved, the medium-frequency sensitivity is remarkably improved, the composite vibrating diaphragm has good rebound resilience and rigidity, the composite vibrating diaphragm can automatically recover after being stressed, contacted and deformed in the turnover process, and the yield of the vibrating diaphragm in the turnover process is remarkably improved.

Description

technical field [0001] The invention relates to the field of acoustic products, in particular to a composite diaphragm of a loudspeaker, a preparation method thereof, and a loudspeaker. Background technique [0002] The loudspeaker is used to convert electrical energy into sound energy, and usually includes a basin-shaped shell, a vibration system and a magnetic circuit system housed in an inner cavity surrounded by the shell, and the vibration system includes a diaphragm and a voice coil connected together. Among them, the loudspeaker diaphragm is the main part of the loudspeaker. The loudspeaker (especially the mid-woofer) converts the electromagnetic force through the voice coil in the center of the diaphragm to the diaphragm closely connected with it to form a mechanical force and produce sound to complete the electric-force-acoustic conversion. In the process of electric-force-acoustic conversion, the diaphragm is the middle mechanical part and the most important part,...

AI Technical Summary

Problems solved by technology

[0004] However, the polysulfide rubber single-layer diaphragm has at least the following technical problems: the polysulfide rubber single-layer diaphragm is easy to fit closely with the mold during the molding process, which makes it difficult to remove the diaphragm, and at the same time, the diaphragm is stretched and deformed during the removal process. , which seriously affects the yield rate of the product; in addition, the modulus of polysulfide rubber is 0.7-10MPa, which is small. When used in speakers, in order to achieve the required F0, the thickness is usually thicker, which makes the weight too heavy, resulting in the intermediate frequency of the product. reduced sensitivity

[0006] However, in the process of implementing the embodiments of the present application, the inventors of the present application found that the above-mentioned technology has at least the following technical problems: the composite diaphragm formed by combining the polysulfide rubber layer and the engineering plastic layer has low elongation at break and poor resilience. This leads to a decline in the waterproof performance of the diaphragm product; and the diaphragm is prone to irreversible deformation during the turnover process, resulting in a high defect rate and virtually increasing the product cost

[0007] Therefore, a composite diaphragm is provided, which can not only improve the problem that the polysulfide rubber single-layer diaphragm is easily attached to the mold during the molding process, resulting in difficulty in demolding, improve sensitivity, but also have both resilience and rigidity, reducing the turnover of the diaphragm Deformation in the process, ensuring quality and reducing defective rate have become technical problems to be solved urgently in this field

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