Water drop detection sensor

Electricity: motive power systems – Automatic and/or with time-delay means – Moisture content or wetness

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Details

318642, 318480, 318DIG2, 1535117, 307 91, 307 101, 307 108, G05B 500

Patent

active

061539953

ABSTRACT:
A water drop detection sensor for detecting water drops W adhering to or present upon a windshield by detecting changes in an amount of reflection light and also for detecting the ambient brightness outside of a car or other vehicle, comprising: a windshield 2; a light emitting means 5 for introducing detection light into the windshield 2; and a light receiving means 6 for detecting reflected detection light. The reflected detection light is reflected by total internal reflection within the windshield 2, and the light emitting means 5 and said light receiving means 6 are provided on the windshield 2.

REFERENCES:
patent: 4871917 (1989-10-01), O'Farrell et al.
patent: 4960996 (1990-10-01), Hochstein
patent: 5998782 (1999-12-01), Koyama et al.

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