Alarm system for detecting glass breakage

Details Alarm system for detecting glass breakage Alarm system for detecting glass breakage

1993-12-06

1995-02-14

Peng, John K.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

340428, 307 102, 70371, 180287, B60R 2510

Patent

active

053899113

ABSTRACT:
An alarm system for detecting glass breakage has a switch having an input terminal, output terminal, and control terminal. The input terminal is electrically connected to a power source such as a battery. An electrically conductive trace is formed on glass, and is electrically connected to the output terminal of the switch. A controller is electrically connected to the control terminal of the switch and controls the operation of the switch between conducting and non-conducting states. The controller measures and compares a reference output terminal voltage of said switching means while said switching means is in the conducting state, a second output terminal voltage while the switch is in the non-conducting state and a third output terminal voltage of the switch while the switching is in the conducting state. The controller generates a control signal in response to a comparison of said measured voltages.

REFERENCES:
patent: 3643756 (1972-02-01), Soreghy
patent: 3947837 (1976-03-01), Bitterice
patent: 4263584 (1981-04-01), Spirig
patent: 4665379 (1987-05-01), Howell et al.
patent: 4792784 (1988-12-01), Kaplan
patent: 5136275 (1992-08-01), Madau et al.
patent: 5172093 (1992-12-01), Nose et al.
patent: 5181010 (1993-01-01), Chick
patent: 5229748 (1993-07-01), Ehringer et al.

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