Light Sensor for Broadband Solar and Twilight Function Control
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United States of America Patent
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Issued Date -
Aug 27, 2009
app pub date -
Nov 6, 2008
filing date -
Feb 27, 2008
priority date (Note) -
Abandoned
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Abstract
The present invention is directed to a sensor that detects external ambient light energy for automatically controlling vehicle headlights while also detecting solar loading within a vehicle passenger compartment for automatically controlling interior climate. The integrated circuit comprises a signal amplifier and a photodetector adapted for receiving ambient light energy. The integrated circuit produces a solar output signal having a first gain and a twilight output signal having a second gain, such that the spectral response of the sensor is dictated primarily by the spectral response of the photodetector. A transmissive layer covers the sensor, and the neutral density diffuser is disposed between the transmissive layer and the integrated circuit and lacks any pigments that would prevent light energy from reaching the photodetector at an undiminished level of intensity.
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