G - Physics – 06 – K
Patent
G - Physics
06
K
352/53.72
G06K 7/10 (2006.01)
Patent
CA 1326711
Abstract The present invention relates to a retro- reflective laser scanning system for reading indicia having portions of different light reflectivity. The scanning system is comprised of a laser diode which is operative for emitting a laser beam at a wavelength which is at least marginally visible to the human eye. An optical means is provided for optically forming and directing the laser beam along an optical path to the indicia. A scanning unit is provided for scanning the indicia in a scan across the same. The returning portion of the reflective laser light has a variable intensity over the scan. A sensor is provided for detecting the variable intensity of the returning portion of the reflected laser light over a field of view. The sensor generates an electrical signal indicative of the indicia being read. The sensor has a generally rectangular detector aperture to minimize interference between ambient light and the returning portion of the reflected laser light. The detector aperture has a long side extending along the scanned direction thereby forming a generally non-circular field of view. A unit is provided for adjustably positioning the laser beam to lie within the non- circular field of view.
610047
Barkan Edward
Shepard Howard M.
Kirby Eades Gale Baker
Symbol Technologies Inc.
LandOfFree
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