Method and apparatus for extending operating range of bar code scanner
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United States of America Patent
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Nov 29, 2005
Issued Date -
N/A
app pub date -
Dec 20, 2002
filing date -
Jul 10, 1998
priority date (Note) -
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Abstract
Briefly stated, the operating depth of field for a bar code scanner, preferably a laser scanner, is increased by placing a cubic phase mask (CPM) in the scanning beam. The masked beam is then scanned and reflected off a bar code and received by a photodetector. The received signal is then processed to recover the original unperturbed representation of the bar code pattern. The processed signal has an increased depth of field over an unmasked scanner signal.
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