Multi-layer bar code arrangement using wavelength separation

A substrate capable of receiving and retaining imaging is coded so as to maximize the amount of the scannable information that can be packed into an area, and/or to provide an effective security feature. A first machine readable identification code (e.g. bar code) is imaged on a predetermined area o...

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Bibliographic Details
Main Author ORRIN D. CHRISTY
Format Patent
LanguageEnglish
Published 28.10.1999
Edition6
Subjects
CALCULATING
COMPUTING
COUNTING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:A substrate capable of receiving and retaining imaging is coded so as to maximize the amount of the scannable information that can be packed into an area, and/or to provide an effective security feature. A first machine readable identification code (e.g. bar code) is imaged on a predetermined area of the substrate, and is opaque to a first predetermined wavelength range of electromagnetic energy (e.g. the infra-red region of light). An overlay is applied over and at least partially covering the first code. The overlay is transparent to the first wavelength range, and opaque to a second wavelength range (e.g. the visible spectrum of light). The overlay may be a security block which substantially completely covers the first code, or may be a second bar code (or additional codes) which is transparent to the second range. The codes may be read by multiple passes of different scanner heads by relative movement between the heads and the substrate, or by a scanner in which first and second (or more) different scanner heads are mounted together so that two different wavelength range bar codes on the substrate may be read at the same time.
Bibliography:Application Number: AU4509896