MANUFACTURING METHOD OF DIAPHRAGM FOR ELECTROACOUSTIC TRANSDUCER

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of a diaphragm for an electroacoustic transducer capable of realizing cost reduction and improvement of the acoustic characteristics through the uniformized physical properties. SOLUTION: A non-molded sheet-like raw material 31 being a raw material of a second diaphragm layer 5 is fitted to a mating face of one metallic mold 13 for injection molding and thereafter another injection molding metallic mold 11 is closed to provide a prescribed diaphragm shape to the sheet-like raw material 31, and a synthetic resin material 26 being a first diaphragm layer 3 is injected into the closed injection molding metallic mold 11 to form the first diaphragm layer 3, thereby obtaining a multilayer structure comprising the second diaphragm layer 5 closely laminated to the first diaphragm layer 3 without the need for an exclusive forming step for the second diaphragm layer 5. Thus, the cost can be reduced by decreasing number of manufacturing steps. COPYRIGHT: (C)2006,JPO&NCIPI