Method and apparatus for visual indication of optical alignment of photoelectric switch
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United States of America Patent
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Jul 10, 1990
Grant Date -
N/A
app pub date -
Aug 15, 1989
filing date -
Aug 15, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An alignment system for photoelectric switch includes a variable frequency oscillator producing a frequency which varies according to a light reception signal from a light receiving element in the photoelectric switch. A light emitting device is energized by the output of the variable frequency oscillator to give a visual indication of alignment. A threshold compares the amplitude of the light reception signal with a preset voltage. When the light reception signal exceeds the preset voltage, a logic element provide steady illumination of the light emitting device as an indication that alignment is completed. A lower threshold is then applied to the threshold to keep the light emitting device steadily illuminated until misalignment or propagation conditions reduce the amount of light received.
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