The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 1988
Filed:
May. 01, 1986
Fumiaki Fujie, Oobu, JP;
Tetsuro Adachi, Okazaki, JP;
Tomonori Fukui, Kariya, JP;
Noboru Oyama, Okazaki, JP;
Yukiyasu Ueno, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
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.