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

摘要

A vibrating plate for an electricity-sound transformer which comprises a film of an aromatic polyimide having a second order transition temperature of 230 to 300˚C, wherein the aromatic polyimide film is prepared from a carboxylic acid component comprising a di-carboxylic acid having a structure obtained by binding two or more of benzene rings through an ether bond as a main component and a diamine component comprising a diaminophenyl ether as a main component.