Patent ID: 7049959

Claim:
A non-power source type monitor device in a non-power source type security device in which a power of the security device for monitoring whether the door or the window of a building is opened or closed, whether a person enters or exits from a building or a room, or whether a vehicle parks in or leaves from a parking place is supplied by a piezoelectric power generating device using a piezoelectric ceramics member, said piezoelectric power generating device generating power by applying a distortion deformation to the piezoelectric ceramics member, said piezoelectric power generating device comprising: a pair of piezoelectric ceramics members; a cushion material for holding each of the piezoelectric ceramics members under a soft state in which the natural oscillation of each piezoelectric ceramics member is hardly transmitted to other structural members; a pendulum member oscillating through one elastic member in accordance with an excitation; a pair of the other elastic members fixed to both the ends of the one elastic member and extending in a direction perpendicular to the one elastic member; and hard striking members respectively fixed to the end parts of the pair of the other elastic members to alternately strike the pair of the piezoelectric ceramics members and apply an impact respectively to the piezoelectric ceramics members; wherein during the oscillation of the pendulum member, a striking operation that one striking member of the pair of the striking members strikes one piezoelectric ceramics member of the pair of the piezoelectric ceramics members and a separating operation that the other striking member of the pair of the striking members is separated from the other piezoelectric ceramics member of the pair of the piezoelectric ceramics members are continuously alternately repeated to continuously generate power.