OPTICAL VARIABLE ELEMENT HAVING A VARIABLE DISTANCE-LAYER THICKNESS

摘要

The security element (6) has a thin-film layer sequence (62,63,64,66,69) incorporating a diffractive structure (67) and at least one spacer layer (65) for providing a color shift via interference. The spacer layer is formed as 2 partial layers (65a,65b) and has a different layer thickness in a first region of the thin-film layer sequence to its thickness in a second region of the thin-film layer sequence, for providing 2 differing color shifts. Also included are Independent claims for the following: (a) a security product with an optically-variable element; (b) a foil with an optically-variable element; (c) a manufacturing method for an optically-variable element