Holographic security device

G - Physics – 03 – H

Patent

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Details

G03H 1/26 (2006.01) B42D 15/00 (2006.01) B42D 15/10 (2006.01)

Patent

CA 2329936

A holographic security device comprising first and second holographic generating structures (2, 3) recorded in respective sets of substantially non- overlapping regions of a record medium. The regions of one set are interleaved with regions of the other set, whereby both interleaved line structures are substantially non-visible to the unaided eye, whereby the holographic security device generates two or more holographic images (A, B) viewed from separate viewing directions around the device and normally seen by tilting the device. Each particular holographic image in a viewing direction is generated in whole or part by the holographic structure associated with one set of interleaved lines.

L'invention concerne un dispositif de sécurité holographique comportant une première et une deuxième structures (2, 3) productrices d'hologramme enregistrées dans des ensembles respectifs de zones sensiblement non chevauchantes d'un support d'enregistrement. Les zones d'un ensemble sont entrelacées avec des zones d'un autre ensemble, ce qui rend les deux structures de lignes entrelacées sensiblement non visibles à l'oeil nu. Le dispositif de sécurité holographique produit deux ou davantage d'images (A, B) holographiques vues à partir de directions de visée séparées autour du dispositif, et qu'on voit normalement en inclinant le dispositif. Chaque image holographique particulière dans une direction de visée est produite en totalité ou en partie par la structure holographique associée à un ensemble de lignes entrelacées.

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