Document security system having thermo-activated pantograph...

Details Document security system having thermo-activated pantograph... Document security system having thermo-activated pantograph...

B - Operations, Transporting

41

M

283/25

B41M 3/14 (2006.01) B42D 15/00 (2006.01) B42D 15/10 (2006.01)

Patent

CA 2281218

A document protection system is disclosed which employs a thermochromic pantograph and a validation mark. Also disclosed is a method to print thermochromic pantographs onto a substrate. A thermochromic pantograph according to the present invention has a latent image which is rendered visible when sufficient heat is applied to the document to activate the reactive properties of the thermochromic ink. The latent image could form a warning message such as "STOP" or "ALERT" which would alert recipients that a counterfeit copy has potentially been created. The thermochromic pantograph may also comprise a camouflage background pattern which conceals the printed ink of the latent image. A validation mark preferably has a latent "validation" image which can be visually identified on an original document, but which cannot be accurately reproduced by conventional copying or scanning means, and thus will not be visible on an unauthorized copy or duplicate. The use of both thermochromic pantograph and validation mark in the present invention provides multiple levels of protection against the unauthorized alteration or counterfeiting of valuable documents. Used in conjuction, these features allow the present invention to provide efficient and effective protection against unauthorized alterations and counterfeits.

Système de protection de documents reposant sur une pantographie thermochrome et sur une marque de validation. L'invention porte également sur une méthode d'impression de pantographies thermochromes sur un substrat. La pantographie thermochrome visée par l'invention comporte une image latente qui est rendue visible lorsqu'une quantité suffisante de chaleur est appliquée contre le document pour activer les propriétés réactives de l'encre thermochrome. L'image latente peut donner un message d'alerte, comme le mot "STOP" ou "ALERTE" conçus pour alerter l'usager contre le risque de contrefaçon. La pantographie thermochrome peut également comprendre un dessin de fond de camouflage, qui masque l'impression de l'encre de l'image latente. La marque de validation présente de préférence une image latente de "VALIDATION" pouvant être identifiée visuellement sur le document original sans pouvoir être reproduite avec précision par les moyens classiques de reprographie, et qui n'appaît donc pas sur une copie ou un duplicata non autorisé. L'utilisation conjuguée d'une pantographie thermochrome et d'une marque de validation apporte plusieurs degrés de protection contre la modification non autorisée ou la contrefaçon de documents de valeur. Utilisés conjointement, ces systèmes apportent une protection efficace contre les modifications non autorisées et les contrefaçons.

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