A method of checking the authenticity of a document with a...

G - Physics – 07 – D

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G07D 7/00 (2006.01) G06K 19/10 (2006.01) G07D 7/12 (2006.01)

Patent

CA 2720561

A method to test the authenticity of a document (1 ), such as an ID, a passport or a card, protected against forgery, wherein it comprises at least an inner co-laminated fabric layer (2) forming an optical watermark. This layer presents cuts, and so separated zones with fabric material and other zones without fabric material, forming well recognizable forms or pictures. Co-laminating one or a plurality of such fabric layers inside of the document body allows to create a multiple watermark having both surface relief and opacity effect, without adding any volume to the body of the document.

L'invention concerne un procédé de test de l'authenticité d'un document (1) protégé contre la falsification, par exemple une carte d'identité, un passeport ou une carte, comprenant au moins une couche intérieure de tissu (2) co-stratifiée qui forme un filigrane optique. Cette couche présente des découpes et donc des zones séparées à matière de tissu et d'autres zones sans matière de tissu, ce qui permet d'obtenir des formes ou dessins aisément reconnaissables. La co-stratification d'une ou plusieurs de ces couches de tissu à l'intérieur du corps du document permet de créer un filigrane multiple qui présente à la fois un relief de surface et un effet d'opacité, sans ajouter aucun volume au corps du document.

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