Document with a moire-generating raster structure

B - Operations – Transporting – 44 – F

Patent

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B44F 1/12 (2006.01) B41M 1/10 (2006.01) B41M 3/14 (2006.01) B42D 15/00 (2006.01) B42D 15/10 (2006.01) G03G 21/04 (2006.01) G07D 7/12 (2006.01)

Patent

CA 2236326

A data carrier has at least one half-tone image (10) generated by structure elements (12). A predetermined symmetrical enlargement of the structure elements (12) represents a corresponding degree of grey of the half-tone image (10). The image (10) has predetermined areas (14, 16 and 22) in which a predetermined number of structure elements (12) is arranged. The number of structure elements (12) in the surface of each area (14, 16 and 22) differs between at least two areas (14, 16 and 22) and/or the structure elements (12) are mutually offset in at least two areas (14, 16 and 22). When a data carrier with such a half-tone image (10) is copied, a moiré pattern is generated in at least certain predetermined areas of the half-tone image (10), so that a copy of the data carrier is immediately visible to the naked eye.

L'invention concerne un support de données comportant au moins une image en demi-teintes (10) représentée par des éléments de structure (12), un élargissement symétrique prédéterminé des éléments de structure (12) représentant un niveau de gris correspondant de l'image en demi-teintes (10). Ces deux dernières présentent des régions prédéfinies (14, 16 et 22) dans lesquelles est respectivement disposé un nombre prédéfini d'éléments de structure (12), le nombre des éléments de structure (12) par surface d'une région (14, 16 et 22) étant différent entre au moins deux des régions (14, 16 et 22), et/ou des éléments de structure (12) étant mutuellement décalés dans au moins deux des régions (14, 16 et 22). Un support de données possédant une telle image en demi-teintes (10) conserve, lors du copiage, un moirage dans au moins des régions prédéfinies de l'image en demi-teintes (10), de sorte qu'une copie du support de données est détectable immédiatement à l'oeil nu.

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