Title: Photoelectric smoke detector with means for adjusting the amount of light projected into the detection region

Abstract: In a photoelectric smoke detector of the type wherein the quantity of light incident upon a light receiving element from a light source is varied in accordance with the concentration of the smoke to be detected thereby producing an electric signal, there are provided a light shielding member for preventing the light from the light source from impinging directly upon the light receiving element and an adjusting screw located near top of the light shielding member for adjusting the quantity of the light projecting to the detection region from the light source and the quantity of the reflected light impinging upon the light receiving element from the smoke.

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Inventors: Kajii, Shigeru (Kawasaki, JA)

Application Number: 567173
Filing Date: 1975-04-11
Publication_date: 1976-11-16
Assignee: Hochiki Corporation (Tokyo, JA)
Primary Class(es): 356/338 250/574, 340/630
Other Classes:
US Patent Ref:

3240109	Mar, 1966	Gran, Jr.	356/207.
3710365	Jan, 1973	Barnes	350/574.
3723747	Mar, 1973	Steele	356/207.
3868184	Feb, 1975	Marsocci	356/103.

Other Refs:
Primary Examiner: McGraw, Vincent P.
Assistant Examiner:
Attorney: Haseltine, Lake & Waters