A diffractive device

G - Physics – 02 – B

Patent

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Details

G02B 5/18 (2006.01) B42D 15/10 (2006.01) B44F 1/12 (2006.01) G02B 27/44 (2006.01)

Patent

CA 2168772

A diffractive device having a surface relief structure which, when illuminated by a light source, generates one or more diffraction images which are observable from particular ranges of viewing angles around the device, wherein at least part of the surface relief structure (1) is arranged in a series of tracks (2), each track (4, 5) having a diffracting surface (3) which generates a component of a diffraction image, such that at least one of the diffraction images generated by the diffractive device is formed from image components generated by a plurality of the tracks.

L'invention se rapporte à un dispositif de diffraction ayant une structure à surface en relief qui, lorsqu'elle est éclairée par une source lumineuse, produit une ou plusieurs images diffractées qu'on peut observer depuis un point situé autour du dispositif selon des angles de vue compris dans des plages particulières. Dans ce dispositif, au moins une partie de la structure à surface en relief (1) est constituée par une série de pistes (2), chaque piste (4, 5) ayant une surface de diffraction (3) qui produit une composante d'une image diffractée, de sorte qu'au moins l'une des images diffractées produites par le dispositif de diffraction soit formée à partir de composantes d'image produites par plusieurs pistes.

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