Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-10-27
1996-03-05
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340630, 356438, G01N 1506, G08B 1710
Patent
active
054970091
ABSTRACT:
A photoelectric sensor of the present invention includes a light emitting device and a light receiving device for detecting scattered light due to smoke, a light emitting confirming device which lights up when a quantity of light received by the light receiving device is greater than or equal to a threshold and a test light emitting device for emitting light to the light receiving device during the test, wherein a blinking of the light emitting confirming device is started at a time of a test start, and a quantity of light received by the light receiving device is increased in steps so that the blinking is stopped when the quantity is greater than or equal to the threshold. Accordingly, the sensitivity test can be performed by visually counting the number of blinkings of the light emitting device.
REFERENCES:
patent: Re34704 (1994-08-01), Cole
patent: 4232307 (1980-11-01), Marsocci
patent: 4317113 (1982-02-01), Honma
patent: 4647785 (1987-03-01), Morita
patent: 4749871 (1988-06-01), Galvin et al.
patent: 4827247 (1989-05-01), Giffone
Kosugi Naoki
Nagashima Tetsuya
Torikoshi Yasuo
Allen Stephone B.
Hochiki Corporation
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