VIBRATING PLATE FOR ELECTRICITY-SOUND TRANSFORMER AND METHOD FOR PRODUCING THE SAME, AND ELECTRICITY-SOUND TRANSFORMER AND EQUIPMENT USING THE SAME

摘要

A diaphragm for an electro-acoustic converter is made of an aromatic polyimide film. A glass transition temperature of the film is 230°C - 300°C. The aromatic polyimide film is made from a carboxylic acid component containing dicarboxylic acid compound having two or more number of ether-linked benzene rings as the major component and a diamine component containing diaminophenyl ether as the major component.