Battery powered smoke detector

Details Battery powered smoke detector Battery powered smoke detector

1978-01-26

1980-01-29

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

250574, 340636, G08B 1710

Patent

active

041863909

ABSTRACT:
A scatter type of smoke detector wholly supplied by a dry cell battery includes a clock circuit applying energy pulses to an LED light source which directs light pulses on a smoke sensing path. Light pulses scattered by smoke generate detection pulses in a photo diode whose amplitude is dependent on the smoke density. The clock pulses and detection pulses are applied to a control circuit including a dual, data-type flip-flop logic circuit and a threshold circuit driving an alarm horn. If the smoke density, and hence the detection pulse amplitude, exceeds a predetermined level the control circuit energizes the alarm in a continuous mode. If the battery drops below a preselected level the control circuit is actuated in an intermittent mode.

REFERENCES:
patent: 3316410 (1967-04-01), Meili et al.
patent: 3946241 (1976-03-01), Malinowski

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