Optical dust detector assembly for use in an automotive vehicle
First Claim
1. An optical dust detector assembly adapted for use in an automotive vehicle for detecting the concentration of dust, smoke or the like contained in a flow of air passing therethrough, the detector assembly comprising:
- air duct means arranged parallel to said air flow and having an introductory portion with an inlet opening, a base portion with an outlet opening, and a pair of radial holes formed in a base portion in peripheral wall and opposed to each other;
a pair of casings disposed at said base portion peripheral wall on both sides thereof and having respective openings ends communicating with the interior of said base portion through the respective radial holes thereof;
a light emission element arranged within one of said casings to emit a light beam therefrom and pass it through the radial holes of said base portion toward the other casing; and
a light receiving element arranged within the other casing to receive the light beam emitted from said light emission element and passed through the radial holes of said base portion;
wherein said air duct member is bent in such a manner as to provide therein an inclined internal surface for deflecting upwardly the flow of air introduced through the introductory portion thereof, and wherein the radial holes are formed in the peripheral wall of the base portion of said duct member to face the flow of air after deflection by the inclined internal surface.
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Accused Products
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.
108 Citations
4 Claims
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1. An optical dust detector assembly adapted for use in an automotive vehicle for detecting the concentration of dust, smoke or the like contained in a flow of air passing therethrough, the detector assembly comprising:
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air duct means arranged parallel to said air flow and having an introductory portion with an inlet opening, a base portion with an outlet opening, and a pair of radial holes formed in a base portion in peripheral wall and opposed to each other; a pair of casings disposed at said base portion peripheral wall on both sides thereof and having respective openings ends communicating with the interior of said base portion through the respective radial holes thereof; a light emission element arranged within one of said casings to emit a light beam therefrom and pass it through the radial holes of said base portion toward the other casing; and a light receiving element arranged within the other casing to receive the light beam emitted from said light emission element and passed through the radial holes of said base portion; wherein said air duct member is bent in such a manner as to provide therein an inclined internal surface for deflecting upwardly the flow of air introduced through the introductory portion thereof, and wherein the radial holes are formed in the peripheral wall of the base portion of said duct member to face the flow of air after deflection by the inclined internal surface. - View Dependent Claims (2, 3, 4)
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Specification