Device for evaluating authenticity features that have a...

G - Physics – 06 – K

Patent

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G06K 7/10 (2006.01) G06K 19/16 (2006.01)

Patent

CA 2411687

An apparatus for evaluating distinguishing authenticity features with diffraction structures on a document, which is placed on an examining surface of a examining device and illuminated by an illumination source, the distinguishing authenticity feature, which is to be examined, diffracting the beam of the illuminating source and projecting it on an evaluating unit in the device. In order to be independent of the nature and location of the diffraction pattern, which is to be evaluated, the diffraction pattern, derived from the document to be examined, is projected onto a projection surface. The projected diffraction image is covered and evaluated by a camera (matrix or cells).

L'invention concerne un dispositif pour évaluer des caractéristiques d'authenticité présentant une structure de diffraction et appliquées sur un document qui est placé sur la surface d'examen d'un dispositif de contrôle et est éclairé par une source de lumière. La caractéristique d'authenticité à examiner diffracte le faisceau provenant de la source de lumière et le projette sur une unité d'évaluation se trouvant dans le dispositif. Le motif de diffraction dérivé du document à examiner est projeté sur une surface de projection, ce qui permet son évaluation quelle que soit la nature et l'emplacement du motif de diffraction à évaluer. L'image de diffraction projetée est captée par une caméra (matricielle ou à balayage linéaire), puis évaluée.

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