| 摘要 |
PURPOSE:To obtain a high resonance frequency by coating Japanese lacquer on one face of a molding product obtained by heat compression of a prepreg sheet made of flaky mica and epoxy resin to suppress the deformation and split vibration of a liquid of diaphragm. CONSTITUTION:Japanese lacquer is coated on at least one face of a molding product obtained by heat compression of the prepreg sheet made of flaky mica and epoxy resin to form a diaphragm. The distortion factor of a speaker using the diaphragm is less because of the composite of the flaky mica and epoxy resin having a large elastic modulus, the high resonance frequency is high and the exfoliation of the composite substance is prevented by coating the Japanese lacquer.
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