SEISMOSENSOR

摘要

PROBLEM TO BE SOLVED: To provide a seismosensor also having a switching function. SOLUTION: The seismosensor is composed of a columnar piezoelectric member 12 vertically installed in a printed circuit board 11 so as to be capable of swinging; a first electrode 14 and a second electrode 15 formed in the facing positions on the outer circumferential surface of the piezoelectric member 12; and a circular third electrode 17 concentrically arranged in the piezoelectric member 12.