| 摘要 |
PURPOSE:To decrease the difference between peaks and dips at high frequencies of a frequency sound pressure characteristic and to increase internal loss, by paper-making the mixture of mica flaky pieces and inorganic short fibers or organic fibrit and impregnating and curing a thermosetting resin composite or an optical curing resin composite. CONSTITUTION:The mica flaky pieces and the inorganic short fibers or the organic fibrit are mixed and paper-maked, and an electroacoustic diaphragm is formed by impregnating and curing the thermosetting resin or the optical curing resin composite. An aromatic polyamide fibrit is used as the organic fibrit. Thus, since the internal loss is larger than that of diaphragms using conventional mica flaky pieces and the elasticity is suitably larger, peaks and dipts at high frequencies of the frequency sound pressure characteristics are decreased, allowing to attain the flat characteristics at the high frequencies. |
