Volume hologram comprising expansion agent layer or...

G - Physics – 03 – H

Patent

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Details

G03H 1/00 (2006.01) B42D 15/10 (2006.01) G03H 1/18 (2006.01)

Patent

CA 2740536

The invention relates to a security element in the form of a multi-layer foil body containing a volume hologram layer (3) which is accommodated using a relief hologram (4). The Bragg grating of the volume hologram is expanded (8) locally using an expansion agent (5) or a contraction agent, in the form of a color image, for example, in order to add a second piece of optional information. A pattern, such as an image, is created either by partially imprinting the expansion agent or using an inserted mask layer (6) that is locally pervious to the expansion agent.

L'invention concerne un élément de sécurité sous la forme d'un corps pelliculaire multicouche qui contient une couche (3) d'hologramme de volume, qui est logée à l'aide d'un hologramme en relief (4). Le réseau de Bragg de l'hologramme de volume est gonflé (8) localement à l'aide d'un agent d'expansion (5) ou d'un agent de contraction sous la forme, par exemple, d'une image en couleur afin d'ajouter une deuxième information optique. Un motif, par exemple une image, est produit soit par application partielle de l'agent d'expansion, soit à l'aide d'une couche de masquage (6) ajoutée qui est localement perméable à l'agent d'expansion.

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