Patent ID: 9004540
Filing Date: 2015-04-14
Classification: B42D,Y10T

Abstract:
1. A security element for security papers, value documents and the like, comprising: a feature region that selectively influences incident electromagnetic radiation and that includes metallic nanopatterns in which volume or surface plasmons are excited and/or resonance effects are caused by the incident electromagnetic radiation, characterized in that the feature region includes, as metallic nanopatterns, one or more subwavelength gratings each having a grating period below the wavelength of visible light, wherein the subwavelength gratings are formed as binary patterns that include exclusively planar metallic areal sections on only two different height levels; characterized in that the feature region includes micropatterns having a line width between about 1 μm and about 10 μm, where the micropatterns form a motif image that is subdivided into a plurality of cells, in each of which are arranged depicted regions of a specified target image the lateral dimensions of the depicted regions being between about 5 μm and about 50 μm, especially between about 10 μm and about 35 μm, characterized in that a viewing grid is provided, composed of a plurality of viewing grid elements for reconstructing the specified target image when the motif image is viewed with the aid of the viewing grid, the lateral dimensions of the viewing grid elements being preferably between about 5 μm and about 50 μm, especially between about 10 μm and about 35 μm.