| 摘要 |
The speaker diaphragm of the present invention includes a nonwoven fabric impregnated with at least a thermosetting resin composition, molded, and cured. The nonwoven fabric is formed of a fiber material containing protein fibers. The thermosetting resin composition contains an unsaturated polyester resin as a main component. The speaker diaphragm of the present invention has excellent acoustic characteristics and is produced with high production efficiency.
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