Patent ID: 6337752
Filing Date: 2002-01-08
Classification: B42D,B44C,G03H,G06K,Y10S

Abstract:
A system comprising a series of data carriers which are manufactured and thereafter issued for use, each of the data carriers having a body provided with a multilayer, optically variable element, said optically variable element comprising diffraction structures and a reflective layer structure, said diffraction structures being visible in the visual spectral range against a background provided by the reflective layer structure in order to present visually recognizable information which is identical for all data carriers of the system, wherein at least a portion of the reflective layer structure is impermeable in the visual spectral range, but at least partly permeable in the invisible spectral range and wherein a printed pattern is disposed below the portion of the reflective layer structure, said printed pattern being recognizable in the in the invisible spectral range but unrecognizable in the visual spectral range.