Document of value and security marking having marking substance

Details Document of value and security marking having marking substance Document of value and security marking having marking substance

G - Physics

06

K

G06K 19/06 (2006.01) B41M 3/14 (2006.01) B41M 5/40 (2006.01) B42D 15/00 (2006.01) D21H 21/48 (2006.01)

Patent

CA 2462803

The invention relates to a valuable document, a security element and a security mark, which contain a marking substance that is absorbent in the infra-red spectral range between 1000 and 2500 nm, but is not significantly absorbent in either the visible spectral range, or at 800 nm. Said marking substance cannot therefore be recognised by the widespread simple IR reading devices, which operate at approximately 800 nm. Preferably, an additional overprint is added, which is absorbent in the visible spectral range and also at approximately 800 nm, but not in the 1000 to 2500 nm range. According to the inventive method, for verification the marked location is irradiated with infra-red light in the 1000 to 2500 nm range and the absorption is determined.

L'invention concerne un document de valeur, un élément de sécurité et un marquage de sécurité, lesquels comportent une substance de marquage absorbant dans le domaine spectral infrarouge entre 1000 et 2500 nm, cette substance n'absorbant de manière significative ni dans le domaine spectral visible ni à 800 nm. C'est pourquoi cette substance de marquage n'est pas lisible pour les appareils de lecture infrarouges simples et largement répandus, lesquels fonctionnent à environ 800 nm. Une impression en surcharge est de préférence ajoutée, laquelle absorbe dans le domaine spectral visible ainsi qu'à environ 800 nm, mais pas dans la zone de 1000 à 2500 nm. Selon la présente invention, la vérification est réalisée par irradiation de l'emplacement marqué avec de la lumière infrarouge dans la zone de 1000 à 2500 nm et par détermination de l'absorption.

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