| 摘要 |
PURPOSE:To make it possible to expand a reproduction frequency band, by making a high elasticity fiber impregnating epoxy resin exist between aluminum foils whose surface has been oxidized, forming a sound diaphragm by unifying them, and making a sound speed of the diaphragm a high value. CONSTITUTION:A high elasticity fiber impregrating epoxy resin is made to exist between aluminum foils whose surface has been oxidized to specified thickness, and a sound diaphragm is formed by unifying them. The ratio occupied by these aluminum foils is made not to exceed 50% of the total weight, and also the ratio of this impregnated epoxy resin is made not to exceed 20%. Furthermore, the high elasticity fiber shall be made a fiber of 1X10<5>kg/cm<2> or more in Young's modulus, and its fiber shall be made of one of a carbon fiber or a ceramic fiber at least. And a reproduction frequency band is expanded by making a diaphragm light in weight and making it have a high sound speed. |
