ELECTRET SHEET

摘要

PROBLEM TO BE SOLVED: To provide an electret sheet retaining a high piezoelectricity even at the time of the use of the same under high temperature.SOLUTION: This electret sheet is provided by implanting electric charges into a synthetic resin sheet containing a synthetic resin and inorganic particulates including silicon particulates and/or silicon carbide particulates so as to electrify the synthetic resin sheet.