Security document containing an authentication device

B - Operations – Transporting – 42 – D

Patent

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B42D 15/10 (2006.01)

Patent

CA 2665097

A flexible security document is provided which contains an authentication device including: a) source of electrical potential (5), the source including a piezoelectric polymeric material including at least one terpolymer of vinylidene fluoride (VDF), trifluoroethylene (TrFE) and a halogenated ethylene based monomer containing at least one non-fluorine halogen atom, the source of electrical potential being activated by mechanical deformation; b) reporter element (3) including a material capable of switching electrically between a first state and a second state, the difference between the first state and the second state being able to be perceived by an unaided human; and c) conducting elements (8) electrically connecting the source of electrical potential and the reporter element to produce an electric circuit. The reporter element (3) may take a number of different forms, such as a light emitting device which lights up or undergoes colour change when activated by the source of electrical potential to provide an indication of authenticity. In a particularly preferred embodiment, the flexible security document is a banknote and the source of electrical potential is applied by printing.

L'invention concerne un document de sécurité flexible, contenant un dispositif d'authentification comportant : a) une source de potentiel électrique (5), comprenant une matière polymère piézo-électrique incluant au moins un terpolymère de fluorure de vinylidène (VDF), de trifluoroéthylène (TrFE) et un monomère à base d'éthylène halogéné incluant au moins un atome d'halogène non fluor, la source de potentiel électrique étant activée par déformation mécanique ; b) un élément reporteur (3) comprenant un matériau capable de se commuter électriquement entre un premier état et un second état, la différence entre le premier état et le second état pouvant être perçue à l'AEil nu; et c) des éléments conducteurs (8) connectant électriquement la source de potentiel électrique et l'élément reporteur pour produire un circuit électrique. L'élément reporteur (3) peut prendre plusieurs formes, dont un dispositif d'émission de lumière qui s'éclaire ou subit un changement de couleur lorsqu'il est activé par la source de potentiel électrique pour fournir une indication d'authenticité. Dans un mode de réalisation particulièrement préféré, le document de sécurité flexible est un billet de banque et la source de potentiel électrique est appliquée par impression.

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