Security document with nano-pattern

Details Security document with nano-pattern Security document with nano-pattern

B - Operations, Transporting

42

D

B42D 15/00 (2006.01) B41M 3/14 (2006.01)

Patent

CA 2422773

A counterfeit-resistant document (10) comprises a substrate (22) and a nano- pattern (32) of nano-structures (38) disposed on the substrate (22), wherein the nano-pattern (32) is configured for forming a latent message (24) (e.g., a warning or alert message) that appears on a copy (20') of the document (20). The nano-pattern (32) forms one of a foreground (28) and a background (30) of the latent message (24); and another pattern, e.g., a conventional pattern (30) or another nano-pattern, forms the other of the foreground (28) and background (30) of the latent message (24). The nano-pattern (32) and the other pattern are configured, such that the foreground (28) and background (30) exhibit substantially similar visual densities on an original of the document, and exhibit substantially different visual densities on the copied document (20').

L'invention concerne un document (10) résistant à la contrefaçon qui comporte un substrat (22), et un nanomotif (32) constitué de nanostructures (38) placé sur le substrat (22). Le nanomotif (32) est conçu pour former un message (24) latent (p. ex. message d'avertissement ou d'alerte) qui apparaît sur une copie (20') du document (20). Le nanomotif (32) forme soit le premier plan (28), soit l'arrière-plan (30) du message (24) latent ; et un autre motif, p. ex. un motif classique (30) ou un autre nanomotif, forme l'autre plan du message (24) latent. Le nanomotif (32) et l'autre motif sont conçus de sorte que le premier plan (28) et l'arrière-plan (30) présentent des densités visuelles sensiblement similaires sur un original du document, et des densités visuelles sensiblement différentes sur le document (20') copié.

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