Banknotes incorporating security devices

Details Banknotes incorporating security devices Banknotes incorporating security devices

B - Operations, Transporting

42

D

B42D 15/00 (2006.01)

Patent

CA 2266579

A security document (1), such as a banknote is formed from a sheet-like substrate (10) of clear plastics material with layers (13, 14, 15, 16) of opacifying ink applied to the surfaces (11, 12) of the substrate (10). The security document (1) includes a security device (20) which is at least partially obscured by the layers (13, 14) of opacifying ink on a first surface (11) of the substrate (10). The layers (15, 16) on the second surface (12) of the substrate (10) are applied in such a manner so as to leave a "half-window" area uncovered by opacifying ink through which the security device (20) is visible from one side of the document (1). The security device (20) may extend transversely outside the half-window area and be visible in transmission, enabling a different contrasting effect to be observed from both sides of the document.

La présente invention concerne un document de sécurité (1), tel qu'un billet de banque formé à partir d'un substrat en feuille (10) faite en matière plastique transparente, des couches (13, 14, 15, 16) d'encres opacifiantes étant appliquées sur les faces (11, 12) du substrat (10). Le document de sécurité (1) inclut un dispositif de sécurité (20) qui est au moins partiellement masqué par les couches (13, 14, 15, 16) d'encres opacifiantes d'une première face (11) du substrat (10). Les couches (15, 16) garnissant la seconde face (12) du substrat (10) sont appliquées de façon à ne dégager dans l'encre opacifiante qu'une "demi-fenêtre" au travers de laquelle le dispositif de sécurité (20) est apparent sur une face du document (1). Ce dispositif de sécurité peut déborder latéralement en dehors de la zone formée par la "demi-fenêtre" de façon à être visible par transparence, permettant ainsi d'observer un effet de contraste différent d'une face à l'autre du document.

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