Security document with a perforation pattern

Details Security document with a perforation pattern Security document with a perforation pattern

B - Operations, Transporting

42

D

B42D 15/00 (2006.01)

Patent

CA 2359937

The invention relates to a forge-proof document comprising a security feature in the form of a perforation pattern which displays grey tones when viewed against a bright background, wherein the document is manufactured from a material which transmits light to a limited extent, at least some of the perforations forming part of the perforation pattern extend over only a part of the thickness of the document at the position of the perforation, and the thickness of the remaining part of the document at the position of the perforation is modulated in accordance with the image to be displayed. The invention also relates to such a document comprising a security feature in the form of a perforation pattern which displays grey tones when viewed against a bright background, wherein at least some of the perforations forming part of the perforation pattern extend at an angle differing from 90° relative to the main plane of the document.

L'invention se rapporte à un document protégé contre la contrefaçon, qui comprend un élément de sécurité en forme de motif à perforations présentant des tons de gris lorsqu'il est visualisé contre un fond éclairé. Le document est fabriqué à partir d'un matériau qui transmet la lumière; dans une certaine mesure, au moins quelques-unes des perforations constituant une partie du motif s'étendent uniquement sur une partie de l'épaisseur du document à la position de la perforation, et l'épaisseur de la partie restante du document à la position de la perforation est modulée en fonction de l'image à afficher. L'invention se rapporte également à un tel document muni d'un élément de sécurité en forme de motif à perforations présentant des tons de gris lorsqu'il est visualisé contre un fond éclairé. Au moins quelques-unes des perforations constituant une partie du motif s'étendent à un angle différent de 90 DEG relativement au plan principal du document.

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