Security document and security element for a security document

Details Security document and security element for a security document Security document and security element for a security document

B - Operations, Transporting

42

D

B42D 15/00 (2006.01)

Patent

CA 2476882

A security element (2, 4), for inclusion in or application to a security document such as to be visually recognisable from both sides of the security document, is made up of multiple layers and comprises an interference element (I) with coloration effect and diffraction structures (8). According to the arrangement of the layers and the diffraction structures (8) on a transparent substrate (S), the coloration effect and/or the diffractive optical effects can be seen from one or both sides of the security element (2, 4). The security element is particularly suitable as double-sided window strands (4) and as label or transfer element (2) over a hole (3).

L'invention concerne un élément de sécurité (2, 4) destiné à être intégré dans un document sécurisé ou appliqué sur un document sécurisé. L'élément de sécurité selon l'invention est caractérisé en ce qu'il est discernable visuellement des deux côtés du document sécurisé (1), en ce qu'il présente une structure multicouche et en ce qu'il comprend un élément d'interférence (I), à effet de changement de couleur et pourvu de structures de diffraction (8). L'effet de changement de couleur ou les effets optiques de diffraction sont perceptibles d'un ou des deux côtés de l'élément de sécurité (2, 4) selon l'agencement des couches et des structures de diffraction existantes (8) sur un substrat transparent (S). L'élément de sécurité selon l'invention convient notamment comme fil de fenêtre (4) double face et comme étiquette ou élément de transfert (2) au-dessus d'une perforation (3).

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