Bar code scanner system and scanner circuitry therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 13, 1990
Issued Date -
N/A
app pub date -
Oct 12, 1988
filing date -
Apr 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an exemplary wand type bar code scanner the scanner circuit includes a first control loop for reducing the LED driving current as the D.C. voltage level supplied to the digitizer tends to exceed a selected D.C. reference value; a second control loop becomes active when the LED is shut off by the first control loop, e.g. in the presence of sunlight. The second control loop controls the gain of the scanner amplifier so that the D.C. reference level at the input to the digitizer circuit is maintained as the scanner scans bar codes in the presence of sunlight but with the LED de-energized.
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Cited Art Landscape
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