ELECTRET STRUCTURE AND METHOD FOR MANUFACTURING SAME, AND ELECTROSTATIC INDUCTION-TYPE CONVERSION ELEMENT

摘要

An electret-structure encompasses a fluorine-resin film 21, an electrode 22 formed on one surface of the fluorine-resin film 21, and a silica layer 21 formed on another surface of the fluorine-resin film 21. The silica layer 21 is implemented by a plurality of island-shaped silica regions 201 for covering the fluorine-resin film 21 in a topology such that the island-shaped silica regions 201 are isolated from each other. And negative charges are deposited on the island-shaped silica regions 201. The static-induction conversion element with the electret-structure 1 can be mounted on a substrate by reflow-process through Pb-free solder.