Surface pattern

Details Surface pattern Surface pattern

B - Operations, Transporting

44

F

B44F 1/02 (2006.01) B44F 1/12 (2006.01) G02B 5/18 (2006.01)

Patent

CA 2241285

A surface pattern (10) has two surface portions (11; l2) with microscopically fine, light-diffracting relief structures. The relief structures are in the form of grating structures GS1 or GS2, respectively, which are composed of at least two superimposed gratings G1 and G2, G3 and G4, respectively. The light-diffracting properties of the gratings G1 to G4 are so selected in accordance with various criteria that novel optical effects which cannot be holographically copied can be achieved with the grating structures GS1 and GS2. Such surface patterns are suitable as optical security elements for documents or articles of all kinds as well as packaging foils.

Cette invention concerne un diagramme de surface (10) possédant deux parties de surface (11, 12) qui comportent des structures en relief diffractant la lumière et d'une finesse microscopique. Ces structures en relief se présentent sous forme de structures de réseau GS1 ou GS2, respectivement, qui se composent chacune d'au moins deux réseaux superposés G1 et G2, ainsi que G3 et G4, respectivement. Les propriétés de diffraction de la lumière des réseaux G1 à G4 sont choisies selon divers critères qui permettent d'obtenir, à l'aide des structures de réseaux GS1 et GS2, de nouveaux effets optiques qui ne peuvent être copiés par holographie. Ces diagrammes de surface peuvent être utilisés en qualité d'éléments de sécurité optique pour des documents ou des articles de tout genre, ainsi qu'en qualité de feuilles d'emballage.

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