B - Operations – Transporting – 42 – D
Patent
B - Operations, Transporting
42
D
B42D 15/10 (2006.01) B42D 15/00 (2006.01)
Patent
CA 2562262
The invention relates to a value document (10), particularly a banknote, comprising a sequence of layers into which visually and/or mechanically recognizable markings are introduced in the form of patterns, letters, numbers, or images under the effect of laser radiation. According to the invention, the sequence of layers encompasses a marking layer (22) that is composed of an ink mixture (24, 26) comprising a component (26) absorbing the laser radiation and a component (24) which is transparent to the laser radiation. The markings are visually and/or mechanically recognizable as a result of an irreversible change in the optical characteristics of the ink mixture (24, 26), said irreversible change being caused by the laser radiation.
L'invention concerne un document de valeur (10), notamment un billet de banque, qui comprend une suite de couches dans laquelle sont insérées, sous l'action d'un rayonnement laser, des identifications détectables visuellement et/ou par machine et ayant la forme de motifs, lettres, nombres ou images. Selon l'invention, la suite de couches contient une couche de marquage (22) constituée d'un mélange d'encre (24, 26) qui comprend un constituant (26) absorbant le rayonnement laser et un constituant (24) transparent pour le rayonnement laser. Les identifications peuvent être détectées visuellement et/ou par machine en raison d'une modification irréversible, provoquée par le rayonnement laser, des propriétés optiques du mélange d'encre (24, 26).
Baldus Christof
Depta Georg
Mayer Karlheinz
Schiffmann Peter
Blake Cassels & Graydon Llp
Giesecke & Devrient Gmbh
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