Vibrating diaphragm and sound production device

A polyurethane prepolymer and isocyanate technology, which is applied to the fixing/tensioning of the diaphragm, transducer diaphragm, electromechanical sensor, etc., can solve the problems of uneven diaphragm thickness, reduced diaphragm yield, and increased loss , to achieve the effect of small residual stress, good acoustic performance and flat diaphragm

Pending Publication Date: 2022-07-29
GOERTEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thermoplastic elastomer diaphragms are often molded by air pressure, and the stretching is uneven during the molding process, resulting in uneven thickness of the diaphragm after molding and uneven molding, which leads to a decrease in the yield of the diaphragm and affects the acoustic performance; On the other hand, due to the linear structure of the thermoplastic elastomer diaphragm, on the one hand, under large strains, the molecules are prone to slip, the viscous part increases, and the loss increases. After the external force is removed, the unrecoverable part increases and the resilience Poor

Method used

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  • Vibrating diaphragm and sound production device
  • Vibrating diaphragm and sound production device
  • Vibrating diaphragm and sound production device

Examples

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Example Embodiment

[0067] Example 1: This example is a diaphragm prepared by using cast-type polyurethane. In parts by weight, the main raw materials of the diaphragm and its dosage are as follows: 100 parts of polyurethane prepolymer, 5 parts of white carbon black, trimethylolpropane 2 parts, 8 parts of 1,4-butanediol, wherein, trimethylolpropane and 1,4-butanediol are chain extenders, and the proportion of chain extenders is 10% of the polyurethane prepolymer. After mixing the above-mentioned raw materials evenly, injecting into the diaphragm mold, and vulcanizing at 100°C, the diaphragm can be prepared. The thickness of the prepared diaphragm is 110 μm and the hardness is 40A.

Example Embodiment

[0068] Example 2: This example is a diaphragm prepared by using cast polyurethane. In parts by weight, the main raw materials of the diaphragm and its dosage are as follows: 100 parts of polyurethane prepolymer, 10 parts of white carbon black, trimethylolpropane 5 parts, 25 parts of 1,4-butanediol, wherein, trimethylolpropane and 1,4-butanediol are chain extenders, and the amount of chain extenders is 30% of the polyurethane prepolymer. After the above-mentioned raw materials are mixed uniformly, they are injected into the diaphragm mold, and the diaphragm is formed after vulcanization at 100° C. The prepared diaphragm has a thickness of 70 μm and a hardness of 75A.

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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, and the elastic recovery rate of the vibrating diaphragm after 20% strain is greater than 70%. According to the technical scheme, the problem that the thermoplastic elastomer vibrating diaphragm is poor in recovery rate after being vibrated at a high temperature or for a long time can be solved, the vibrating diaphragm can be uniform in thickness and smooth in forming in the air pressure forming process, and therefore it is guaranteed that the vibrating diaphragm has good acoustic performance.

Description

technical field [0001] The invention relates to the technical field of electro-acoustic conversion, in particular to a vibrating membrane and a sound-generating device. Background technique [0002] At present, the diaphragm in the sound generating device usually adopts a thermoplastic elastomer diaphragm, such as a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer diaphragm. Because thermoplastic polyurethane elastomer and thermoplastic polyester elastomer diaphragm have good plasticity, damping and temperature resistance, with the high demand for high power and high sound quality of speakers, thermoplastic elastomer diaphragm has been widely used in the field of speakers. Promote the application. However, the thermoplastic elastomer diaphragm is often formed by air pressure, and the stretching is uneven during the molding process, resulting in uneven thickness of the diaphragm after molding and uneven molding, resulting in a decrease in the yiel...

Claims

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Application Information

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IPC IPC(8): H04R31/00H04R9/02H04R9/06H04R7/18
CPCH04R31/003H04R9/025H04R9/06H04R7/18H04R2231/001H04R2307/023H04R2307/025H04R9/02H04R31/00C08G18/10C08L75/04C08J5/18H04R7/00
Inventor 闫付臻王伟超李春
Owner GOERTEK INC
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