Infrared-ray sensitive alarm device built into electronic equipm

Details Infrared-ray sensitive alarm device built into electronic equipm Infrared-ray sensitive alarm device built into electronic equipm

1985-04-15

1987-02-24

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specified housing

250340, 340567, G08B 1318

Patent

active

046460713

ABSTRACT:
An alarm device is built into electrical equipment such as a portable radio receiver or tape recorder and connected to a loud speaker unit for producing an alarm sound by sensing infrared rays emitted from an intruder and sensed by an infrared ray detector included therein.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 3908180 (1975-09-01), Braginsky
patent: 4523095 (1985-06-01), Keller-Steinbach
patent: 4551711 (1985-11-01), Akiyama et al.

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