Rain sensor with ambient light compensation
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United States of America Patent
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Mar 24, 2009
Grant Date -
Jun 21, 2007
app pub date -
May 13, 2004
filing date -
May 15, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal processing circuit provided with an outside-light component reducing circuit capable of reducing an outside light component in the frequency separation method is provided. This is a signal detecting circuit which irradiates a pulse light from an LED to a windshield of a vehicle, receives a reflected light by a PD, processes the pulse signal from the PD and inputs it to a processing unit in order to automatically control a wiper for eliminating raindrops on the windshield of the vehicle. This is provided with a current—voltage converter circuit for converting the pulse signal from the LED to a voltage signal, an outside-light component reducing circuit provided in parallel with the current—voltage converter circuit for reducing the outside light component included in the output signal of the current—voltage converter circuit and a band-pass filter circuit/amplifier circuit for reducing the noise in the output signal of the current—voltage converter circuit and amplifying the output signal.
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