Photoelectric color sensor
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United States of America Patent
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-
Sep 22, 1992
Grant Date -
N/A
app pub date -
Mar 25, 1991
filing date -
Mar 25, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
At least one pair of light emitting diodes (LEDs) is disposed to direct a beam of common discrete chromaticity each to a separate target area located at different distances from a centrally disposed photodetector. Upon pulsing of the diodes at a common time, the photodetector receives the sum of the diffused light reflected from a target disposed at a location between the separate target areas to substantially reduce the affects of variation in distance of a target from the photodetector. The photodetector output is corrected for the effects on the LEDs of variations in ambient temperature.
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