Security element and security document with such a security...

B - Operations – Transporting – 42 – D

Patent

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Details

B42D 15/00 (2006.01)

Patent

CA 2476213

A security element ( 2, 4) for insertion in or application to a security document, whereupon said element is visually recognisable from both sides of the security document (1), structured in various layers, and comprising two interference elements (I~1, I~2) having a colour-varying effect, a metal reflecting layer (R) disposed therebetween, and, optionally, diffraction structures (8). The colour-varying effect and/or the optical diffracting effects of one or two sides of the security element (2,4) can be perceived according to the arrangement of the layers (I~1, R, I~2 ) and the optionally provided diffraction structures (8) on a transparent substrate (S). The security element is particularly suitable for use as a double-sided window thread (4) and as a label or transfer element (2) above a hole (3) in the security document (1).

L'invention concerne un élément de sécurité (2, 4) à incorporer dans un document de sécurité ou à appliquer sur ce dernier de sorte qu'il soit visible des deux côtés du document de sécurité (1). Cet élément de sécurité est constitué de plusieurs couches et comporte deux éléments d'interférence (I1, I2) provoquant une variation de couleur en fonction de l'angle d'observation, une couche réfléchissante métallique (R), intercalée entre les deux éléments d'interférence, ainsi qu'éventuellement des structures de diffraction (8). En fonction de l'agencement des couches (I1, R, I2), et éventuellement des structures de diffraction (8), sur un substrat transparent (S), l'effet de variation de couleur et/ou les effets de diffraction optique peuvent être perçus d'un côté ou des deux côtés de l'élément de sécurité (2, 4). Cet élément de sécurité est particulièrement approprié comme fil à fenêtre (4) à deux côtés et comme étiquette ou élément de transfert (2) recouvrant un trou (3) pratiqué dans le document de sécurité (1).

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