Document counter and endorser with light source control
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United States of America Patent
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Mar 6, 1990
Issued Date -
N/A
app pub date -
Apr 7, 1989
filing date -
Apr 15, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for examining documents moved along a path between a light source normally energized at a first level and a photodetector, in which a first potential proportional to the long term average value of the photodetector output with no document between the light source and the photodetector and a second potential proportional to the instantaneous value of the photodetector output are compared to energize the light source at a higher level by shorting part of the resistance in the normal energizing circuit when the second potential falls below a predetermined percentage of the first potential.
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