Security device based on customised microprism film

Details Security device based on customised microprism film Security device based on customised microprism film

B - Operations, Transporting

42

D

B42D 15/00 (2006.01) B44F 1/10 (2006.01) G02B 5/04 (2006.01) G02B 5/124 (2006.01)

Patent

CA 2600431

A security device comprises at least two regions, each region comprising a prismatic surface structure defining an array of substantially planar facets. Each region forms a reflector due to total internal reflection when viewed at at least one first viewing angle and is transparent when viewed at at least one second viewing angle. The said at least one first viewing angle of one region is different from the at least one first viewing angle of the other region. Furthermore, a security device comprising an asymmetrical or truncated prismatic surface structure is located in a transparent area of an article.

L'invention concerne un dispositif de sécurité comprenant au moins deux régions présentant individuellement une structure de surface prismatique définissant un réseau de facettes sensiblement planes. Chaque région constitue un réflecteur en raison de la réflexion interne totale lors de la visualisation au niveau d'au moins un premier angle de visualisation et est transparente lors de la visualisation au niveau d'un second angle de visualisation. Le premier angle de visualisation d'une région est différent du premier angle de visualisation d'une autre région.

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