Patent ID: 7405879
Filing Date: 2008-07-29
Classification: B42D,G02B,G03H,Y10T

Abstract:
1. An optically variable element, wherein the optically variable element has a thin film layer succession with at least one spacer layer for producing color shifts by means of interference, wherein in a first region of the thin film layer succession the spacer layer is of a different layer thickness from in a second region of the thin film layer succession, wherein the layer thicknesses of the spacer layer in the first and second regions are so selected that in the first region of the thin film layer succession a first color shift is produced by means of interference and in the second region of the thin film layer succession a second color shift which is different from the first color shift is produced, wherein the optically variable element has a diffractive structure for producing diffraction effects, wherein the diffractive structure covers the first and/or the second regions of the thin film layer succession.