Bragg diffracting security markers

Details Bragg diffracting security markers Bragg diffracting security markers

B - Operations, Transporting

41

M

B41M 3/10 (2006.01) B41M 3/14 (2006.01) G03F 7/16 (2006.01) G03F 7/00 (2006.01)

Patent

CA 2635807

A method of marking an article with a watermark that diffracts radiation according to Bragg's law is disclosed. The watermark includes a periodic array of particles fixed in a matrix. The watermark may change colors with viewing angle, disappear and reappear with viewing angle or may diffract non-visible radiation that is detectable at certain angles of detection.

L'invention concerne un procédé destiné à marquer un article avec un filigrane diffractant un rayonnement selon la loi de Bragg. Le filigrane comprend un réseau périodique de particules fixées dans une matrice. Ce filigrane peut changer de couleur selon l'angle de vue, disparaître et réapparaître, ou diffracter un rayonnement non visible détectable à certains angles de détection.

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