Verification of barcodes
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United States of America Patent
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Dec 15, 1998
Grant Date -
N/A
app pub date -
Aug 3, 1995
filing date -
Aug 3, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
Verification patterns are associated with barcodes to provide rapids visual confirmation that a barcode is printed within acceptable tolerances. A master of a barcode to be produced includes at least one verification pattern including a wedge formed by an unprinted area or areas bounded by a printed area or areas. During reproduction, an anticipated degree of ink-spread will cause a predetermined degree of shortening of the wedge, while abnormal degrees of shortening are an indication of press and/or pre-press errors and/or an inappropriately specified master. With a suitably dimensioned wedge, compliance with bar and space width tolerances can be assessed. Two types of verification patterns may be used in conjunction with a single bar code to enable detection of different types of errors.
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