Improvements in security devices

B - Operations – Transporting – 42 – D

Patent

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Details

B42D 15/00 (2006.01) B42D 15/10 (2006.01)

Patent

CA 2705278

The present invention relates to improvements in security devices that can be used in varying shapes and sizes for various authenticating or security applications, and in particular to an optically variable security device utilising colourshift materials. The security device (10) comprises a first and a second layer (11a, 1ib) of a colourshifting material at least partially overlying each other and each having different colourshifting properties. At least partially applied over surface of one of the colourshifting layers is a light control layer (12) having a surface structure which modifies the angle of reflected light, such that light reflected by the security device is seen at a different viewing angle.

La présente invention porte sur des améliorations apportées à des dispositifs de sécurité. Ces améliorations peuvent être utilisées en des formes et dimensions diverses pour des applications d'authentification et de sécurité diverses, et en particulier sur un dispositif de sécurité optiquement variable qui utilise des matériaux à changement de couleur. Le dispositif de sécurité (10) comprend une première et une seconde couche (11a, 11b) d'un matériau à changement de couleur se chevauchant au moins partiellement entre elles et présentant chacune différentes propriétés de changement de couleur, une couche de commande de couleur (12), appliquée au moins partiellement sur la surface de l'une des couches de changement de couleur, et dont la structure superficielle modifie l'angle de la lumière réfléchie de sorte que la lumière réfléchie par le dispositif de sécurité est observée à un angle de visualisation différent.

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