Vehicle windshield and wiper with rain sensor

Details Vehicle windshield and wiper with rain sensor Vehicle windshield and wiper with rain sensor

1988-02-09

1989-05-02

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Moisture content or wetness

318444, 318DIG2, 15250C, B60S 108

Patent

active

048271985

ABSTRACT:
A pair of outer conducting members on the outside of a windshield are separated by a long common insulating border defining a border resistance in parallel with a first capacitance. Each of the outer conducting members is capacitively coupled through a layer of the windshield to an inner conducting member to form coupling capacitances in series with the combination of the border resistance and first capacitance. The preceding elements form a timing circuit for an oscillator, the timing circuit having an equivalent capacitance varying with the border resistance. When water droplets bridge the border of the outer conducting members, the border resistance decreases from infinity to change the equivalent capacitance of the timing circuit and thus the frequency of the oscillator circuit; and this change is detected to modify wiper operation.

REFERENCES:
patent: 2206820 (1940-07-01), Mydlil
patent: 3786330 (1974-01-01), Inoue et al.
patent: 3826979 (1974-07-01), Steinmann
patent: 4238799 (1980-12-01), Parfitt
patent: 4567412 (1986-01-01), Graham
patent: 4588935 (1986-05-01), Kaneiwa et al.
patent: 4613802 (1986-09-01), Kraus et al.
patent: 4665351 (1987-05-01), Nyberg
patent: 4703237 (1987-10-01), Hochstein
patent: 4740735 (1988-04-01), Hayashi
patent: 4748390 (1988-05-01), Okushima et al.

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