Window mounted optical moisture sensor having light pipes with d

Details Window mounted optical moisture sensor having light pipes with d Window mounted optical moisture sensor having light pipes with d

1992-05-27

1993-11-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

318483, H01J 516

Patent

active

052626407

ABSTRACT:
Mounting of a sensing unit upon the interior surface of a vehicle windshield for detecting the presence of moisture upon the exterior surface and controlling operation of windshield wipers in response thereto is disclosed. The sensing unit comprises a block in which angularly oriented bores are disposed. Light pipes in a first set of the bores communicate with light sources for transmitting light to the outer surface of the windshield, and light pipes in a second set of the bores transmit light reflected from the outer surface to photo-detectors. The lower ends of the light pipes are coplaner with or raised slightly above the surface of the block which is to be secured to the windshield. The block is affixed to the interior surface of the windshield by a double faced adhesive interlayer which both securely adheres the block to the windshield surface and optically couples the light pipes to the windshield.

REFERENCES:
patent: 4701613 (1987-10-01), Watanabe et al.
patent: 4859867 (1989-08-01), Larson et al.
patent: 4935621 (1990-06-01), Pikulski

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