Optical security element

G - Physics – 06 – K

Patent

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Details

G06K 19/16 (2006.01) B42D 15/00 (2006.01) B42D 15/10 (2006.01)

Patent

CA 2528352

The invention relates to an optical security element comprising a substrate layer, into some areas of a planar zone (2) of which a first microstructure is molded so as to create a first, optically recognizable effect. Said planar zone (2) is divided into microscopically fine pattern regions (21 to 40) and a background region (20), the first microstructure being molded into the pattern region (21 to 40) but not into the background region (20). The microscopically fine pattern regions (21 to 40) in the planar zone (2) are arranged in the form of a moiré pattern into which a hidden piece of information that can be evaluated by means of an allocated verification element is encoded as a security feature. The microscopically fine pattern regions (21 to 40) are also substructured according to a substructuring function that describes a microscopic substructure of the moiré pattern, which is used as an additional security feature.

L'invention concerne un élément de sécurité optique comprenant une couche substrat dans une zone de surface (2) de laquelle est façonnée par endroits une première microstructure servant à générer un premier effet optiquement perceptible. La zone de surface (2) est subdivisée en zones de motifs microscopiquement fines (21 à 40) et en une zone d'arrière-plan (20). La première microstructure est réalisée dans les zones de motifs (21 à 40), mais pas dans la zone d'arrière-plan (20). Les zones de motifs microscopiquement fines (21 à 40) dans la zone de surface (2) sont placées selon un motif moiré dans lequel est codée, en tant qu'attribut de sécurité, une information cachée évaluable au moyen d'un élément de vérification associé. Les zones de motifs microscopiquement fines (21 à 40) sont en outre sous-structurées selon une fonction de sous-structuration qui décrit une sous-structuration microscopique, servant d'attribut de sécurité supplémentaire, du motif moiré.

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