Sensor of the theft and the like of automobiles
AssigneeIwata Electric Co., Ltd.
InventorKeisuke Iwata
Life of this patent
Estimating the term…
Abstract
A piezo-electric film is pasted to one surface of an elastic film fixed at the ends and a weight is attached substantially to the middle of the other surface of this elastic film.
Claims5
A vehicular anti-theft sensor comprising a resonant piezoelectric film bonded to one surface of an elongated elastic carrier film for conjoint vibration, said carrier film being supported at its end in a substantially horizontal position and being provided with a weight attached substantially midway, its ends on its other surface whereby changes in vibration of said vehicle modifies the response of said piezoelectric film to produce an output signal reflective therof.
A vehicular anti-theft sensor comprising an elongated thin elastic carrier film, means for mounting said carrier film under tension on said vehicle to vibrate in response to movement on said vehicle, a weight secured to the underside of said carrier film to regulate the frequency of the vibration, and a resonant piezoelectric film bonded to the upper surface of said carrier film for conjoint vibration therewith, the resonance of said piezoelectric film being modified by the conjoint vibration to produce an output signal reflective thereof.
Dependencies are inferred from the claim text.