Add-on bar-code reading apparatus in a bar-code reader

Details Add-on bar-code reading apparatus in a bar-code reader Add-on bar-code reading apparatus in a bar-code reader

1995-10-06

1997-11-11

Hajec, Donald T.

Registers

Coded record sensors

Readout control

235463, 235494, G06K 700

Patent

active

056867158

ABSTRACT:
An add-on bar code reading apparatus used in a bar code reader identifies a block of a main-part bar code by detecting start and end guard-bars, determines a right end of the main-part bar code based upon whether all the characters in the block carry even parity, detects the add-on bar code a predetermined interval after the right end, and reads the add-on bar code thus-detected. The apparatus also determines whether a plurality of sets of add-on characters are read which have differing numbers of characters, compares the plurality of sets of add-on characters character-by-character for equality in character code and in parity, and determines whether the number of characters is equal to that of the set having the smallest number of characters. When a match is determined the set of add-on characters having the largest number of characters for the add-on bar code is selected.

REFERENCES:
patent: 4973829 (1990-11-01), Ishida
patent: 5128527 (1992-07-01), Kawai et al.
patent: 5189289 (1993-02-01), Watanabe
patent: 5198649 (1993-03-01), Brooks
patent: 5262625 (1993-11-01), Tom
patent: 5278398 (1994-01-01), Pavlidis et al.

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