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 the die of a drying apparatus having a gap corresponding to the shape of a diaphragm 400, and the object is heated and dried so that one part of a vibrating portion 420 becomes thick, thereby forming a foaming thick portion 421 and a non-foaming portion 422. By improvement in bending rigidity by thickness by foaming and improvement in strength by tangling of fibers by fine fiber-like binding material, the diaphragm can be partially reinforced in a state of even weight by preventing increase in weight without reinforcement such as lamination of a different sheet-like member or impregnation of a composite resin, and frequency characteristic is flattened and satisfactory acoustic characteristic can be obtained. COPYRIGHT: (C)2005,JPO&NCIPI