Diaphragm of sounding device and sounding device

Abstract

The invention discloses a diaphragm of a sounding device and the sounding device. The diaphragm comprises at least one layer of an elastomer layer; the elastomer layer is made of a EPDM rubber; the EPDM rubber is formed by polymerization of three monomers, wherein the three monomers include an ethylene monomer, a propylene monomer and a non-conjugated diene monomer, the mass ratio of the ethylene monomer to the propylene monomer ranges from 0.25 to 4, and the content of the non-conjugated diene monomer is 1%-15% of the total content of the ethylene monomer and the propylene monomer. The EPDM rubber has good high temperature resistance and thermo-oxidative aging resistance; after the EPDM rubber is made into the diaphragm, the diaphragm can work in a high temperature environment for a long time, not only can maintain excellent elasticity, but also has excellent fatigue resistance, and thus has excellent reliability.

Description

technical field [0001] The present invention relates to the technical field of electroacoustic conversion, more specifically, to a diaphragm of a sound generating device and a sound generating device Background technique [0002] With the advancement of science and technology, the application of electronic products is becoming more and more extensive, especially the market for personal consumer electronics products such as smartphones, tablet computers, and smart watches is becoming more and more popular. Consequently, there is an increasing demand for miniature sound generating devices used in personal consumer electronics products. [0003] In the existing miniature sound generating devices, single-layer or multi-layer composite engineering plastics or thermoplastic elastomers are mostly used as the diaphragm material. Due to the limitation of the vibration space, the total thickness of the existing diaphragm is usually controlled within 100 μm, while the thickness of the...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the membrane layer of the diaphragm is relatively thin, and the diaphragm is prone to stress concentration points during the vibration process

At the same time, the diaphragm needs to work at high temperature and vibrate repeatedly, and the stress concentration of the diaphragm will become extremely fragile

In the place where the stress is concentrated, the engineering plastic diaphragm is prone to rupture. During high temperature operation, the thermoplastic elastomer diaphragm is prone to softening and deformation, resulting in deterioration of the acoustic performance of the diaphragm or complete failure of the diaphragm as a whole. Happening

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