Passive remote photoelectric surveillance alarm with telescopic

Details Passive remote photoelectric surveillance alarm with telescopic Passive remote photoelectric surveillance alarm with telescopic

1990-04-03

1991-09-10

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250206, 250221, G08B 1318

Patent

active

050477498

ABSTRACT:
An intruder alarm includes a circuit with a photoresistive cell located in a housing with a piezoelectric crystal sound generator and battery to power the circuit and sound generator. A telescope concentrates light from a distance in a limited field of view upon the photoresistive cell to trigger the piezoelectric crystal sound generator when light intensity on the cell changes sufficiently from an ambient light intensity level.

REFERENCES:
patent: 3636542 (1972-01-01), Apple
patent: 3842257 (1974-10-01), Kohler
patent: 3932746 (1976-01-01), Swanson

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