Registers – Coded record sensors – Particular sensor structure
Patent
1989-11-01
1990-10-16
Levy, Stuart S.
Registers
Coded record sensors
Particular sensor structure
235463, 235470, 382 9, G06K 710
Patent
active
049637193
ABSTRACT:
A scanning method and scanning system according to the present invention determines the bar code data printed on a pair of concatenated, two-segment bar code labels, which labels have been scanned by repeatedly sweeping a beam in a succession of scanning passes to determine the left segment data and the right segment data of each of the pair of labels. The labels are of the type in which the left segment data and the right segment data are combinable to form a valid checksum. During scanning, it is noted if a left segment and a right segment were scanned during a single scanning pass across either or both of the pair of labels. Left segment data from a first left segment is combined with right segment data from a first right segment. If a valid first checksum results, the same left data is combined with right segment data from a second right segment. If a valid second checksum results, then left segment data from the second left segment is combined with right segment data from the first right segment. If a valid third checksum results, then the same left data is combined with the right segment data from the second right segment to calculate a fourth checksum. If all the checksums are valid, and if a left segment and a right segment were scanned during a single scanning pass, then those segments scanned are accepted as having been printed on the same label.
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patent: 4667089 (1987-05-01), Shirakabe et al.
patent: 4764668 (1988-08-01), Hayard
patent: 4776024 (1988-10-01), Katoh et al.
patent: 4873426 (1989-10-01), Sarna et al.
Brooks Michael T.
Cherry Craig D.
Levy Stuart S.
Mullins Kenton R.
Spectra-Physics
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