Diffractive indicia for a surface

Details Diffractive indicia for a surface Diffractive indicia for a surface

C - Chemistry, Metallurgy

09

D

C09D 11/00 (2006.01) B41M 3/12 (2006.01) B41M 3/14 (2006.01) B41M 5/03 (2006.01) B44C 1/10 (2006.01) B44C 1/165 (2006.01) B44F 1/12 (2006.01) B44F 1/14 (2006.01) G02B 27/42 (2006.01)

Patent

CA 2173838

Diffractive indicia for a surface (1) comprising a plurality of small separate diffractive elements (2) and means for adhering the diffractive elements to the surface. Each diffractive element has a diffractive surface relief structure and is not separately resolvable to the human eye. The appearance of the diffractive indicia, when applied to the surface, changes when the viewing angle and/or angle of ilumination relative to the surface changes. In preferred arrangements, the diffractive indicia are incorporated in an ink or a transfer medium. A palette of diffractive indicia with different characteristic colours and other optical properties may be provided.

Des repères diffractifs, destinés à une surface, comprennent plusieurs petits éléments (2) diffractifs séparés et un dispositif permettant de les faire adhérer à cette surface. Chaque élément diffractif comporte une structure en relief à surfaces diffractives et il n'est pas séparément résoluble par l'oeil humain. L'apparence des repères diffractifs, une fois qu'ils sont appliqués sur la surface, change selon l'angle d'observation et/ou d'éclairage de cette surface. Dans des variantes préférées, ces repères diffractifs sont incorporés dans une encre ou un milieu de transfert. On peut proposer une palette de repères diffractifs ayant des couleurs caractéristiques différentes ou d'autres propriétés optiques.

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