Methods and ink compositions for invisibly printed security...

B - Operations – Transporting – 41 – J

Patent

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B41J 2/21 (2006.01) B41J 2/01 (2006.01) B41J 3/00 (2006.01)

Patent

CA 2524390

An article is marked with image indicia for authentication, information, or decoration by providing a plurality of inks having a plurality of fluorescence colors when exposed to excitation energy, separating colors of the image indicia into a plurality of image levels in accordance with the fluorescence colors of the inks, and printing each image level in mutual registration on the article using the corresponding ink. The image printed with each ink may be substantially invisible under illumination within the visible spectrum. The invisibly printed images have multiple authentication features, including the use of covert UV-fluorescent materials, IR-fluorophores, microparticles, and other chemical taggants. Ink compositions, methods for making the inks, and methods and apparatus for using the inks are also disclosed.

Un article est marqué au moyen d'images imprimées à des fins d'authentification, d'information ou de décoration. Pour ce faire, on prévoit une pluralité d'encres comportant une pluralité de couleurs fluorescentes lorsqu'elles sont exposées à une énergie d'excitation ; les couleurs des images imprimées sont séparées en une pluralité de niveaux d'image selon les couleurs fluorescentes des encres ; et chaque niveau d'image est imprimé sur l'article en superposition mutuelle au moyen de l'encre correspondante. L'image imprimée à l'aide de chaque encre peut être sensiblement invisible sous un éclairage actif dans la partie visible du spectre. Les images imprimées de manière invisible comprennent de multiples caractéristiques d'authentification, incluant l'utilisation de matières invisibles fluorescentes aux UV, de fluorophores IR, de microparticules et d'autres marqueurs chimiques. L'invention concerne aussi des compositions d'encre, des procédés de fabrication des encres ainsi que des procédés et des dispositifs d'utilisation de celles-ci.

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