Optical switching device employing a frequency synchronous circuit
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United States of America Patent
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-
Nov 27, 1990
Grant Date -
N/A
app pub date -
Jul 1, 1988
filing date -
Jul 14, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Optical switching device for sensing an object. The optical switching device includes an oscillator, an light-emitting circuit for emitting a light pulse train corresponding to a pulse train from the oscillator to the object, a light-receiving circuit for converting the light pulse train depending on the presence of the object into an electrical detection pulse train, a synchronous circuit for synchronizing the frequency of the detection pulse train with an adjustable frequency to provide a certain logic signal in synchronism, and a switching circuit for generating object detection logic signals in response to the logic signal from the synchronous circuit.
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