| 摘要 |
PROBLEM TO BE SOLVED: To provide a material for a speaker diaphragm, having lightweight, high elastic modulus without deteriorating sound quality caused by a change in the elastic modulus and the internal loss due to a temperature change, by solving the problem of a conventional synthetic resin made diaphragm that has deteriorated sound quality especially at a high temperature, because the characteristic change due to temperature is rapid in spite of its lightweight advantage, while the requirements of a material for the speaker diaphragm are light-weight, high elastic force and a large internal loss and the synthetic resin made diaphragm, such as polystyrene or polypropylene providing lighter weight in recent use frequently, in place of pulp-made diaphragm which has been in use over a long time. SOLUTION: Material for the speaker diaphragm is characterized in its employment of an aromatic polycarbonate resin foamed body having a density of 0.03-0.6 g/cm3 and a thickness of 0.5-10 mm.
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