Light-transmissible foreign object sensor

Details Light-transmissible foreign object sensor Light-transmissible foreign object sensor

1984-03-30

1987-06-30

Willis, Davis L.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

250573, 318483, 318DIG2, 356136, G01N 2141

Patent

active

046766383

ABSTRACT:
A sensor for detecting a light-transmissible foreign object, such as a raindrop, attached on a transparent body, such as a windowglass of a vehicle includes a light source, a light receiving unit disposed on the inside of the transparent body, and a prism fixedly attached on the transparent body on the inside thereof and arranged in a manner so that the light emitted toward the transparent body from the light source is caused to advance through the prism to reach the light receiving unit and that the quantity of light received by the light receiving unit changes when a light-transmissible foreign object attaches on the outside of the transparent body. The prism includes a restriction surface for preventing external light which enters the prism through the transparent body from coming into the light receiving unit.

REFERENCES:
patent: 4481450 (1984-11-01), Watanabe et al.

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