Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1992-04-16
1994-02-22
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340426, 340566, 340665, 340683, 340689, B60R 2510
Patent
active
052891593
ABSTRACT:
An automobile theft sensor has a piezo-electric element adhered at one side to a base member and which generates a voltage in response to vibration of the automobile body, a weight adhered to the opposite side of the piezo-electric element, a silicon rubber coating covering at least a portion of the surface of the piezo-electric element and weight, a low pass filter for receiving the output voltage of the piezo-electric element and for providing an ultra low frequency signal within the range of 1-5 Hz produced by the above mentioned piezo-electric element; and a band pass filter for receiving the output voltage of the piezo-electric element and for providing a low frequency bandpass signal centered on the 30-50 Hz produced by the above mentioned piezo-electric element in response to vibration of the above mentioned automobile body. When either of the filter outputs exceeds a predetermined level it is judged that theft or tampering is occurring.
REFERENCES:
patent: 4307387 (1981-12-01), Baxendale
patent: 4356364 (1982-10-01), Soto
patent: 4636775 (1987-01-01), Burgess et al.
patent: 4656458 (1987-04-01), Iwata
patent: 4661939 (1987-04-01), Braunling
patent: 4732041 (1988-03-01), Iwata
patent: 4814753 (1989-03-01), Coppola
patent: 4853677 (1989-08-01), Yarbrough et al.
patent: 4972713 (1990-11-01), Iwata
Crosland Donnie L.
Kabushiki Kaisha Iwata Electric
Lefkowitz Edward
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