Optical barcodes having spatially phase shifted clock and reference tracks
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United States of America Patent
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Nov 22, 2016
Grant Date -
Apr 7, 2016
app pub date -
Nov 25, 2015
filing date -
Oct 1, 2010
priority date (Note) -
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Abstract
Barcodes are provided that are applied to or integrated with a moving carrier, where the barcodes have a plurality of information modules, at least one clock track having a plurality of alternating clock track modules and at least one reference track having a plurality of alternating reference track modules, where the at least one reference track is a second clock track and has a same periodicity as the clock track but a spatial phase shift when compared to the clock track. The barcode is configured to allow at least one barcode reader to determine a direction of movement of the carrier from at least one signal from a clock track detector and at least one signal from a reference detector.
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