Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-05-01
1988-05-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356439, G01N 1506, G01N 2100
Patent
active
047483369
ABSTRACT:
An optical dust detector assembly includes an air duct member having an introductory portion and a base portion for permitting a flow of air passing therethrough, the duct member having a pair of radial holes formed in its peripheral wall, a pair of cylindrical casings secured to the peripheral wall of the duct member at both sides thereof and having respective opening ends communicating with the interior of the duct member through the respective radial holes thereof, a light emission element arranged within one of the casings to emit a light beam and pass it through the radial holes toward the other casing, and a light receiving element arranged within the other casing to receive the light beam emitted from the light emission element and passed through the radial holes. The air duct member is bent in such a manner as to form therein an inclined internal surface for deflecting upwardly the flow of air introduced through the introductory portion, and the radial holes are formed in a peripheral wall of the base portion of the duct member to face the flow of air deflected by the inclined internal surface so that foreign particles like rain or snow are not deflected upward toward the optical detector.
REFERENCES:
patent: 3313946 (1967-04-01), Goodwin et al.
patent: 3659278 (1972-04-01), Jensen
patent: 3816004 (1974-06-01), Bignardi
patent: 3946234 (1976-04-01), Vandermark
patent: 4662758 (1987-05-01), Fukui et al.
Adachi Tetsuro
Fujie Fumiaki
Fukui Tomonori
Oyama Noboru
Ueno Yukiyasu
Allen Stephone B.
Nelms David C.
Nippondenso Co. Ltd.
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