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US 6,293,468 B1Granted
Pulsed barcode scanner
AssigneeNCR Corporation
InventorsEdward G. Rantze, Joseph M. Lindacher
Life of this patent
Estimating the term…
Abstract
A barcode is scanned by a scanner having a laser emitting a pulsed laser beam which reflects off the barcode and is detected by a light detector. A receiver operatively joined to the light detector is tuned to the frequency of the pulsed laser beam for increasing signal gain.
Claims16
A scanner for scanning a barcode comprising:
- a pulse-mode laser for emitting across said barcode a laser beam pulsed at a pulse frequency;
- a light detector for detecting said laser beam reflected off said barcode at a data rate different than said pulse frequency;
- and
- a receiver operatively joined to said light detector and tuned to said pulse frequency for resolving said reflected laser beam at said pulse frequency to decode said barcode.
1 more element
A method of scanning a barcode comprising:
- sweeping across said barcode a laser beam pulsed at a pulse frequency;
- detecting said laser beam reflected off said barcode at a data rate different than said pulse frequency by tuning to said pulse frequency;
- and
- decoding said barcode by resolving said detected pulsed laser beam at said pulse frequency.
1 more element
Dependencies are inferred from the claim text.