Diffractive, polarization modulating optical devices

G - Physics – 03 – H

Patent

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Details

G03H 1/02 (2006.01) G02B 5/18 (2006.01) G02B 5/30 (2006.01) G06K 19/16 (2006.01) G07D 7/12 (2006.01)

Patent

CA 2553980

An optical device comprises an encoding surface having a micro-relief pattern (22) over at least part thereof designed to produce a predetermined diffracted first image when illuminated in use, and an optically anisotropic layer (26) such as a polymerised liquid crystal provided whereby at least part of said micro-relief pattern (22) induces local orientation of said optically anisotropic layer (26) thereby to impose a predetermined polarization modulation, thereby to produce a predetermined polarization dependent second image when illuminated in use.

La présente invention a trait à un dispositif optique comportant une surface de codage présentant une configuration de micro-reliets (22) sur au moins une partie de celle-ci destinée à produire une première image diffractée prédéterminée lors de son éclairage en utilisation, et une couche d'anisotropie optique (26) telle qu'un cristal liquide polymérisé permettant l'induction par au moins une partie de ladite configuration de micro-reliefs (22) d'une orientation locale de ladite couche d'anisotropie optique (26) permettant ainsi d'imposer une modulation de polarisation prédéterminée, pour obtenir une deuxième image dépendante de polarisation prédéterminée lors de son éclairage en utilisation.

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