SOUND TRANSMITTING MEMBRANE, ELECTRONIC PART WITH SOUND TRANSMITTING MEMBRANE, AND PROCESS FOR PRODUCING CIRCUIT BOARD HAVING THE ELECTRONIC PART MOUNTED THEREON

摘要

Sound transmitting membrane (11) comprising porous membrane (13) composed mainly of polytetrafluoroethylene which permits sound transmission but inhibits passage of foreign matter, such as water drop; and heat resistant double coated pressure sensitive adhesive sheet (15) disposed on a partial region of at least one major surface of the porous membrane (13).