| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker diaphragm with high sound quality, which provides a sufficient sonic velocity and reduces an environmental load by mixing a proper binder when composing polylactic acid that is a resin derived from a plant, and bamboo fiber. SOLUTION: A material obtained by composing the polylactic acid 1A of plant material, the bamboo fiber 1B and a binder 1C of natural system is formed by injection-molding. The polylactic acid 1A that is the resin derived from the plant, and the bamboo fiber 1B are easily bound by improving compatibility thereof and rigidity is improved, thereby obtaining a speaker diaphragm with high sound quality, which provides the sufficient sonic velocity and reduces an environmental load. COPYRIGHT: (C)2010,JPO&INPIT
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