Method of checking the authenticity of a document with a co-laminated fabric layer inside
AssigneeHID Global Corporation
InventorsHermann Hecker, Andreas Griesbach
Life of this patent
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Abstract
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.
Claims16
A method of checking the authenticity of at least one of a document, a passport, and a card, with a structure consisting of several co-laminated layers, one of the inside layers being a fabric layer extending at least over a part of said document and having at least first predefined zones with fabric material and second predefined zones without fabric material, wherein said method comprises at least the steps of:
- illuminating different spots on a surface of the document
- detecting the light emitted by each said spots
- determining if each spot at the surface of the document is located at the vertical of said first or second zones in the inside of the document.
Dependencies are inferred from the claim text.