PIEZOELECTRIC-TYPE ELECTROACOUSTIC CONVERSION DEVICE

摘要

A lower surface of a circular support plate made of resin is fixed to an upper surface of a ring-shaped frame. A circular through hole is provided in a center portion of the support plate, a lower surface of a circular metal plate is fixed to a portion of an upper surface of the support plate positioned at the circumference of the through hole. An upper-groove is provided in a ring shape positioned inward of an upper surface of the metal plate. A shock absorbing member made of elastic materials is provided in the upper groove of the metal plate. A piezoelectric element is provided on a portion of the upper surface of the metal plate positioned inward from the shock absorbing member, and a portion of an upper surface of the shock absorbing member positioned on an inner periphery portion of the shock absorbing member.