Raindrop detection apparatus and method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 3, 2004
Grant Date -
Sep 12, 2002
app pub date -
Mar 11, 2002
filing date -
Mar 12, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A raindrop detection apparatus has an amplifier circuit, including a plurality of resistors and resistor selection switches. The control circuit performs the first adjustment to an output of the amplifier circuit, roughly adjusting the output to a target value. The first adjustment is made by selecting one of or a combination of resistors. The control circuit then performs the second adjustment to the output, closely adjusting the output to the target value. The second adjustment is made by adjusting a driving instruction signal, which actually adjusts a light emitting device driving current. These adjustments are performed after an IG switch and an AUTO mode switch of a wiper switch are turned on.
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Cited Art Landscape
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