Patent
Optical positive feedback sensor circuit
TLDR
In this article, an optical positive feedback sensor circuit which converts regularly coded information into electrical signals is presented, and a circuit is included to maintain a light level at least sufficient to restart the operation after a period of light obstruction.Abstract:
An optical positive feedback sensor circuit which converts regularly coded information into electrical signals. When not obstructed by the coded opaque pattern on a moving information carrier light from a light emitting diode is detected by a phototransistor. The output of the phototransistor is then amplified. A portion of the amplifier output provides positive feedback through the light emitting diode, driving the circuit into saturation. A circuit is included to maintain a light level at least sufficient to restart the operation after a period of light obstruction.read more
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