Rain sensor with improved avoidance of reflected light

Details Rain sensor with improved avoidance of reflected light Rain sensor with improved avoidance of reflected light

1989-08-10

1991-01-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340602, G01V 904, G08B 2100

Patent

active

049872966

ABSTRACT:
A rain sensor operates such that when a raindrop cuts off a direct light beam from a transmitter to a detector, the output level of the detector is lowered. A convex member is disposed to prevent a portion of the light emitted from the transmitter from reflecting and then reaching the detector. Thus, detecting error due to such reflected light is reduced.

REFERENCES:
patent: 3648054 (1972-03-01), Nance
patent: 4737634 (1988-04-01), Sasaki et al.

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