Vibrating diaphragm and sound production device

Abstract

The invention discloses a vibrating diaphragm and a sound production device. Wherein the vibrating diaphragm is prepared from pouring type polyurethane, the pouring type polyurethane is prepared by vulcanizing a polyurethane prepolymer and a compounding agent, the polyurethane prepolymer is a block polymer, the block polymer is formed by alternately arranging hard segments and soft segments, the hard segments are isocyanate, the soft segments are polyol flexible long chains, and the flexible long chains are made of polyurethane. The end groups of the block polymer are isocyanate hard segments. According to the technical scheme, the defect that a thermoplastic elastomer vibrating diaphragm is poor in swelling resistance can be overcome, and the vibrating diaphragm has good swelling resistance.

Description

technical field [0001] The invention relates to the technical field of electro-acoustic conversion, in particular to a vibrating membrane and a sound producing device. Background technique [0002] The diaphragm in the existing sounding device usually adopts a thermoplastic elastomer diaphragm, the common ones are the thermoplastic polyurethane elastomer diaphragm and the thermoplastic polyester elastomer diaphragm, because the thermoplastic polyurethane elastomer and the thermoplastic polyester elastomer diaphragm have Good damping and resilience, with the high demand for waterproof and sound quality in the speaker field, these two types of elastomer diaphragms have been popularized and applied in the speaker field. [0003] However, thermoplastic elastomer diaphragms often have some defects during use: speakers using thermoplastic elastomer diaphragms need to be glued and fixed with glue when the diaphragm is assembled and connected to the sound-emitting device, because th...

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Problems solved by technology

[0003] However, thermoplastic elastomer diaphragms often have some defects during use: speakers using thermoplastic elastomer diaphragms need to be glued and fixed when the diaphragm is assembled and connected to the sounding device, because the small molecules in the glue will penetrate into the The interior of the thermoplastic elastomer layer causes swelling problems, which damages the performance of the thermoplastic elastomer and seriously affects the acoustic performance and reliability of the sound-generating device; on the other hand, electronic products such as mobile phones, Watches, Drivers, etc. are inevitably It will touch the skin, and the cosmetics, sunscreen, and oil secreted on the surface of the skin will penetrate into the product, causing the diaphragm to swell, affecting the performance and life of the product, and bringing a bad experience to the user

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