Smoke detector

Details Smoke detector Smoke detector

1975-09-08

1977-12-13

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

250552, 250574, G08B 1710

Patent

active

040632270

ABSTRACT:
Smoke detector apparatus characterized in the utilization of solid state components in conjunction with standard primary batteries as a power source. Operating under photo-optical principles, the apparatus incorporates a solid state detector which, while having a low current drain characteristic, exhibits dark current phenomena. A stabilization network is provided to accommodate for this phenomena which includes an amplifier having a transistor stage and means for clamping that stage in a partially forwardly biased state. Detection of smoke causes the amplifier to generate a signal output as a step function.

REFERENCES:
patent: 3534351 (1970-10-01), Harnden, Jr. et al.
patent: 3887836 (1975-06-01), Leete
patent: 3917956 (1975-11-01), Malinowski

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