Object having a holographic security feature and method for...

G - Physics – 03 – H

Patent

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G03H 1/04 (2006.01) B42D 15/00 (2006.01) G03H 1/26 (2006.01) G07D 7/12 (2006.01)

Patent

CA 2594367

An optical security feature, e.g. for a banknote or other security documents, comprises a first and a second holographic layer (6, 7) arranged on top of each other. Each layer comprises a comparatively simple reflective volume hologram (8, 9), such as it can e.g. be recorded by the interference pattern of two Gaussian light beams. The volume holograms (8, 9) have different grating spacing and/or orientation as well as different extension such that the observer can distinguish and verify them easily. The simple nature of the holograms make the security feature easy to manufacture, while its two-layer structure makes it hard to copy and yields high diffraction efficiency.

L'invention concerne une caractéristique de sécurité optique, par exemple pour un billet de banque ou d'autres documents de sécurité, comprenant des première et seconde couches holographes (6, 7) disposées l'une sur l'autre. Chaque couche comprend un hologramme volumique réfléchissant comparativement simple (8, 9), de manière qu'il puisse être, par exemple, enregistré par le modèle d'interférence de deux faisceaux lumineux gaussiens. Les hologrammes volumiques (8, 9) comprennent différents espacements et/ou orientation de réseaux, ainsi qu'une extension distincte, de manière que l'observateur puisse les distinguer et les vérifier facilement. La nature simple des hologrammes rend la caractéristique de sécurité facile à fabriquer, alors que la structure à deux couches la rend difficile à copier et produit un rendement de diffraction élevé.

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