DIAPHRAGM, MANUFACTURING METHOD THEREOF, AND SPEAKER DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a diaphragm which is easily manufactured and has satisfactory characteristics. SOLUTION: At least any one kind of fiber material of wooden pulp, chemical fiber and inorganic fiber, a foaming agent and a fine fiber-like binding material of high beating degree are blended as necessary to prepare a paper making material and make paper. A molded object after paper making is attached in the inside of a die of a drying apparatus having a gap corresponding to the shape of a diaphragm 400, and the object is heated and dried to be foamed so that an edge 430 becomes thick. By improvement in rigidity by thickness by foaming and tangling between fibers by the fine fiber-like binding agent, the strength of the edge 430 can be improved without increasing the minimum resonant frequency without reinforcement such as lamination of a different sheet-like member or impregnation of a composite resin, and a satisfactory acoustic characteristic can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI