PIEZO-ELECTRIC DETECTOR FOR DETECTING MOTIONS COMPRISING A RECORDER APPARATUS FOR RECORDING DETECTED MOTIONS

摘要

A motion sensor comprises a piezoelectric element (26, 27) provided with electrodes (28) and mounted inside an enclosure (31) into which is enclosed movably a flyweight (25 ). The piezoelectric element outputs a pulse when struck by the inertia block (25). A microcomputer (18) adds and records the pulses across the electrodes of said piezoelectric elements (26, 27).