Photo-electric smoke detector with light shielding electrode

Details Photo-electric smoke detector with light shielding electrode Photo-electric smoke detector with light shielding electrode

1985-02-11

1987-07-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250211J, 250237R, G01N 1506

Patent

active

046789219

ABSTRACT:
In a photo-electric smoke detector device, a first photo-detector receives the light emitted from a light emitter and scattered by smoke, and a second photo-detector directly receives the light emitted from the light emitter. The second photo-detector has an element surface on which trimmed electrodes are arranged. The electrodes of the second detector act to limit the amount of light emitted from the light emitter and transmitted to the elements of the second detector.

REFERENCES:
patent: 3600588 (1981-08-01), Sayce
patent: 4242673 (1980-12-01), Cooper

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