Wiper control apparatus

Details Wiper control apparatus Wiper control apparatus

1998-07-22

1999-06-29

Font, Frank G.

Optics: measuring and testing

By configuration comparison

356445, 356448, 356343, G01B 1100

Patent

active

059176032

ABSTRACT:
A wiper control apparatus of the water drop sensitive type for detecting of the amount of water or water drops adhering to or present upon the front surface of a windshield and for driving a wiper, comprising: a light emitting means for introducing light into the inside of the windshield so that the light experiences total internal reflection upon interior surfaces of the windshield; a light receiving means for receiving the light reflected within the windshield; means for turning a first output D1, a second output D2, and a third output D3 to either an H level or an L level in response to the level of a signal output from the light receiving means, the outputs being preset in sequence of height of sensitivity thereof; means for outputting a drive signal WD for the wiper when outputs D1, D2, and D3 are switched into the H level; means for maintaining the drive signal as long as the second output signal D2 is in the H level even if the third output D3 turns to the L level; and means for stopping the drive signal WD for the wiper when the second output D2 turns OFF.

REFERENCES:
patent: 3971956 (1976-07-01), Jakeman et al.
patent: 5414518 (1995-05-01), Yazejian

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