Electro-optical rain detector for windshields

Details Electro-optical rain detector for windshields Electro-optical rain detector for windshields

1985-11-12

1987-10-20

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250577, 340602, H01J 516

Patent

active

047016132

ABSTRACT:
An electro-optical liquid detector assembly comprises a support block having a flat front surface attached to the internal surface of a wind-shield and being formed therein with a pair of inclined bores opening toward the internal surface of the wind-shield, a transparent flat plate contained within the support block and fixed to the support block to form a common flat front surface with the support block, the transparent flat plate being formed in its rear surface with a pair of spaced v-grooved portions which are opposed to the inclined bores, a light emitting element disposed within one of the inclined bores to emit a beam of light into the wind-shield through one of the v-grooved portions of the flat plate so as to cause internal reflection of the beam between the external and internal surfaces of the wind-shield, and a light receiving element disposed within the other inclined bore to receive the incident beam reflected by the external surface of the wind-shield through the other v-grooved portion of the flat plate so as to produce an electric signal indicative of an amount of the incident beam.

REFERENCES:
patent: 3674335 (1972-07-01), Ashkin et al.
patent: 4518259 (1985-05-01), Ward
patent: 4589771 (1986-05-01), Watanabe et al.

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