Composite vibrating diaphragm of sound production device and preparation method thereof and sound production device

Abstract

The invention discloses a composite vibrating diaphragm of a sound production device and a preparation method thereof and the sound production device. The composite vibrating diaphragm comprises at least one thermoplastic elastomer layer and at least one thermosetting polyurethane rubber layer, the preparation method comprises the following steps of: providing the rubber layer, wherein the preparation method of the rubber layer comprises the steps of: adopting polyurethane rubber to be prepared into a film body through a film forming technology, wherein the film body is an uncrosslinked polyurethane rubber layer or a semi-crosslinked polyurethane rubber layer; fitting the rubber layer with a thermoplastic elastomer layer to form a composite film; and carrying out molding treatment on the composite film to form a vibrating diaphragm, and carrying out a crosslinking reaction on the non-crosslinked polyurethane rubber layer or the semi-crosslinked polyurethane rubber layer in the moldingtreatment to form a thermosetting polyurethane rubber layer. According to the invention, the bonding force between the diaphragm layers in the composite diaphragm can be improved, the reliability of the existing composite diaphragm structure is improved, the problems of layering and even diaphragm breaking after long-term vibration are avoided, and the overall resilience of the diaphragm is obviously improved.

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...

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Problems solved by technology

[0004] 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: (1) The adhesive force between the thermoplastic elastomer layer and the adhesive film layer is not strong enough, resulting in product failure. Reliability declines, and there will be problems of delamination or even membrane rupture after long-term vibration; (2) The overall resilience of the composite diaphragm is lacking, resulting in the diaphragm membrane fracture of the sounding device after large-amplitude vibration or harsh air-tightness tests , subsidence and other risks

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