Identifying medium and identifying method for object

G - Physics – 09 – F

Patent

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Details

G09F 3/03 (2006.01) B42D 15/10 (2006.01) G07D 7/12 (2006.01) G09F 3/00 (2006.01) G09F 19/12 (2006.01)

Patent

CA 2475317

An identifying medium (A) for identifying the authenticity of an object by providing an optically identifiable mark on the object. A film (20) having the light reflection layer of polymer cholesteric liquid crystal having in turn a circularly polarized light selectivity of reflecting a specific circular polarized light is fixed to part of the surface of a support (10), and printing is made on the portions other than the film (20) of the support (10) in the same color as that shown when the film (20) is viewed from the front. The identifying medium (A) appears to be red at the support (10) and the film (20) when viewed from the front (although the film has a metallic gloss), but, at a larger viewing angle, the film (20) changes to blue by the blue-shift of polymer cholesteric liquid crystal to show a color different from the support (10) does.

La présente invention concerne un moyen (A) d'identification qui permet d'identifier l'authenticité d'un objet du fait de la formation d'une marque identifiable sur l'objet. Un film (20) comportant la couche de réflexion de la lumière en cristal liquide cholestérique polymère ayant à son tour une sélectivité de la réflexion de la lumière polarisée circulairement d'une lumière polarisée circulaire spécifique est fixé sur une partie de la surface d'un support (10) et une impression est réalisée sur les parties du support autres que le film, (20), cette impression étant de la même couleur que celle qu'on voit lorsque le film (20) est regardé depuis le devant. Le moyen (A) d'identification semble être rouge au niveau du support (10) et le film (20), lorsqu'on le regarde depuis le devant (bien que le film ait un brillant métallique) mais avec un angle visuel plus grand, change de couleur et devient bleu du fait du déplacement hypsochrome du cristal liquide cholestérique polymère, pour présenter une couleur différente de celle du support (10).

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