A micromechanical inertial sensor is provided having a reduced pickoff Q, while maintaining a high motor Q. A polarizing filter is positioned between an ultraviolet light source and a photopolymer plate. Special provision is made for detecting an electrical discharge, or smoldering or burning of a printing medium inside the microwave mechanism, and then initiating suitable countermeasures. The floating gate and a pair of control gates positioned on opposite sides of the floating gate constitute one memory cell, the adjacent memory cells share the control gate positioned between the memory cells. The contact part faces the supporting column at a corresponding place to guide a communication between the supporting column and the common line. These processes are repeated until photographing operation is performed by operating a release unit.