A security document with micro-prisms

B - Operations – Transporting – 42 – D

Patent

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Details

B42D 15/10 (2006.01) B41M 3/14 (2006.01) B44F 1/12 (2006.01) G07D 7/00 (2006.01)

Patent

CA 2665517

A security document (1) including a substrate (3) of transparent polymeric material, and opacifying layers (5, 6) provided on opposing sides of the substrate (3). The opacifying layers (5, 6) act to guide light propagating within the substrate (3). The opacifying layers (5, 6) only partially cover the substrate (3) to form one or more windows (9). The substrate (3) is formed with at least one micro-prism (13) for diverting light propagating within the substrate (3) out of the windows (9) to thereby provide a contrast enhancement between specific areas of the security document (1) and remaining areas. The micro-prisms (13) may also be arranged to direct light incident on the windows (9) to propagate along the substrate (3) and out of an (edge 19), (21) of the substrate (3). The light emission caused by the micro-prisms (13) may be used to determine a characteristic of the security document (1).

La présente invention concerne un document de sécurité (1) comprenant un substrat (3) en matériau polymère transparent, et des couches opacifiantes (5, 6) appliquées sur des côtés opposés du substrat (3). Les couches opacifiantes (5, 6) permettent de guider la lumière se propageant à l'intérieur du substrat (3). Les couches opacifiantes (5, 6) ne recouvrent que partiellement le substrat (3), formant ainsi une ou plusieurs fenêtres (9). Le substrat (3) comporte au moins un microprisme (13) permettant de dévier la lumière se propageant à l'intérieur du substrat (3) afin qu'elle sorte par les fenêtres (9) pour obtenir ainsi une amélioration du contraste entre des zones spécifiques du document de sécurité (1) et les zones restantes. Les microprismes (13) peuvent également être disposés pour diriger la lumière incidente sur les fenêtres (9) afin qu'elle se propage le long du substrat (3) et sorte par un bord (19, 21) du substrat (3). L'émission de lumière induite par les microprismes (13) peut être utilisée pour déterminer une caractéristique du document de sécurité (1).

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