Optically variable element and the use thereof

Details Optically variable element and the use thereof Optically variable element and the use thereof

G - Physics

02

B

G02B 5/32 (2006.01) B42D 15/10 (2006.01) G02B 5/18 (2006.01) G02B 26/00 (2006.01) G09F 19/12 (2006.01)

Patent

CA 2506838

Proposed is an optically variable element which at least in surface portions has an interface which is embedded between two layers and which forms an optically effective structure, that interface having a free-form surface which appears three-dimensionally for a viewer. To emphasise that free-form surface it is proposed in accordance with the invention that the free-form surface is formed by a partial region of the interface, which is of a lens-like configuration and which produces a magnification, reduction or distortion effect. Further subject-matter of the application is the use of such optically variable elements as a security element to prevent forgery of value-bearing documents or for articles to be safeguarded, in particular as part of the decorative layer arrangement of a transfer or laminating film.

L'invention concerne un élément optiquement variable comprenant, au moins dans des zones partielles, une surface limite (3) qui est intégrée entre deux couches (1, 2), forme une structure optiquement active et comporte une zone de forme libre perçue en trois dimensions. Cette zone de forme libre peut être accentuée si elle est formée par une zone partielle de la surface limite (3) qui est configurée à la manière d'une lentille de façon à générer un effet d'agrandissement, de réduction ou de déformation. Cette invention concerne en outre l'utilisation dudit élément optiquement variable en tant qu'élément de sécurité pour empêcher la falsification de documents de valeur ou pour protéger des objets, en particulier en tant que partie d'un ensemble de couches décoratives d'une feuille de transfert ou d'une feuille stratifiée.

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