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Machine translation
1. (WO1981003507) PAPER SECURITIES WITH AUTHENTICITY MARK OF LUMINESCENT MATERIAL
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/003507    International Application No.:    PCT/DE1981/000078
Publication Date: 10.12.1981 International Filing Date: 29.05.1981
IPC:
B41M 3/14 (2006.01), D21H 21/48 (2006.01), G06K 19/14 (2006.01), G07D 7/12 (2006.01)
Applicants:
Inventors:
Priority Data:
3022329 13.06.1980 DE
Title (EN) PAPER SECURITIES WITH AUTHENTICITY MARK OF LUMINESCENT MATERIAL
(FR) PAPIER-VALEUR AVEC MARQUE D"AUTHENTICITE EN MATIERE LUMINESCENTE
Abstract: front page image
(EN)Paper security with luminescent authenticity mark overprinted or incorporated, which is absorbant in the visible spectrum but has a transparency window in the infrared The luminescent substance emits in that window. By the absorption in the visible spectrum, the undesirable stray emissions are suppressed making then visible the luminescent substance by excitation. To check the authenticity of the document, an emission into the infrared is used. Appropriate luminescent substances are metal rare earths into appropriate host networks, particularly in ferrite or garnet networks, which contain transition metal ions as absorbing elements.
(FR)Papier-valeur avec marque d"authenticite luminescente surimprimee ou incorporee, laquelle est absorbante dans le spectre visible mais a une fenetre de transparence dans l"infrarouge. La substance luminescente emet dans cette fenetre. Par l"absorption dans le spectre visible on supprime des emissions parasites indesirables pouvant par excitation rendre visible la substance luminescente. Pour verifier l"authenticite du document, on emploie une emission dans l"infrarouge. Des substances luminescentes qui conviennent sont des terres rares metalliques dans des reseaux hotes appropries, notamment dans des reseaux ferrites ou des grenats, lesquels contiennent comme elements absorbants des ions metalliques de transition.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)