Label with a diffractive bar code and a reading arrangement...

G - Physics – 06 – K

Patent

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Details

G06K 19/16 (2006.01) G06K 7/10 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2460671

A label (1) comprising a layer composite (15) includes at least one machine-readable diffractive bar code (3) consisting of narrow rectangular fields (4) occupied by the optically active structures and intermediate surfaces (5). The optically active structures which are covered by a reflection layer are embedded between layers of the layer composite (15). The diffractive relief structure used in the diffractive bar code (3) for the fields (4) diffracts and polarizes incident light and scatters the diffracted light into a half-space above the diffractive relief structure. A second diffractive relief structure differs at least in respect of the polarization of the polarizedly backscattered light with respect to the first diffractive relief structure. The second diffractive relief structure can be used for example for field surfaces of a second bar code in the bar code field (9) on the label (1) or for the intermediate surfaces (5). The light which is polarizedly backscattered at the diffractive bar code (3) can be detected by means of one of the known commercially available reading apparatuses for bar codes produced by printing. The bar code produced by printing can be used for individualizing the labels (1).

L'invention concerne une étiquette (1) à base d'un composite stratiforme (15) contenant au moins un code-barres (3) diffractif lisible par machine, à base de champs (4) minces, rectangulaires, recouverts des structures optiquement actives et de faces intermédiaires (5). Les structures optiquement actives revêtues d'une couche de réflexion sont intégrées entre les couches du composite stratiforme (15). La structure en relief diffractive utilisée dans le code-barres (3) pour les champs (4), diffracte et polarise la lumière incidente et diffuse la lumière diffractée dans un espace semi-infini au-dessus de la structure en relief diffractive. Une seconde structure en relief diffractive diffère, au moins dans la polarisation de la lumière diffractée en retour de manière polarisée, de la première structure en relief diffractive. La seconde structure en relief diffractive s'utilise par exemple pour des faces de champ d'un second code-barres dans le champ du code-barres (9) sur l'étiquette (1) ou pour les faces intermédiaires (5). La lumière diffractée en retour de manière polarisée sur le code-barres (3) diffractif peut être détectée au moyen d'un des appareils de lectures du commerce connus, pour code-barres produits par technique d'impression. Le code-barres obtenu par technique d'impression s'utilise pour individualiser les étiquettes (1).

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