Security element, value document comprising such a security element and method for producing such a security element
First Claim
1. A security element for a security paper, the security element comprisinga carrier having a reflective areal region which is divided into a multiplicity of reflective pixels,the area of each pixel being smaller than the area of the reflective areal region by at least one order of magnitude,each pixel comprising at least one reflective facet which is formed in a surface of the carrier, the at least one reflective facet reflecting light incident along a predetermined direction on the areal region directionally in a reflection direction predefined by the orientation of said facet, andthe orientations of the facets of different pixels having a random variation over the reflective areal region,wherein the orientations of the facets of different pixels have a random variation around different average orientations predefined in a region-based manner, resulting in regionally different average reflection directions of the pixels.
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Abstract
A security element for a security paper, value document or the like, having a carrier which has a reflective areal region which is divided into a multiplicity of reflective pixels. The area of each pixel is smaller than the area of the reflective areal region by at least one order of magnitude. Each pixel has at least one reflective facet which is formed in a surface of the carrier, and the at least one reflective facet reflects light incident along a predetermined direction on the areal region directionally in a reflection direction predefined by the orientation of the facet. The orientations of the facets of different pixels have a substantially random variation over the reflective areal region.
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Citations
22 Claims
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1. A security element for a security paper, the security element comprising
a carrier having a reflective areal region which is divided into a multiplicity of reflective pixels, the area of each pixel being smaller than the area of the reflective areal region by at least one order of magnitude, each pixel comprising at least one reflective facet which is formed in a surface of the carrier, the at least one reflective facet reflecting light incident along a predetermined direction on the areal region directionally in a reflection direction predefined by the orientation of said facet, and the orientations of the facets of different pixels having a random variation over the reflective areal region, wherein the orientations of the facets of different pixels have a random variation around different average orientations predefined in a region-based manner, resulting in regionally different average reflection directions of the pixels.
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21. A method of making a security element for security papers, the method comprising the steps:
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providing a carrier having a surface that is so height-modulated in an areal region that the areal region is divided into a multiplicity of pixels with respectively at least one facet; coating said facets so as to form reflective facets which reflect light incident along a predetermined direction on the areal region per pixel respectively directionally in a reflection direction predefined by their orientation; making the area of each pixel smaller than the area of the areal region by at least one order of magnitude; and arranging the orientations of the facets of different pixels to have random variation over the reflective areal region, wherein in arranging the orientations of the facets, the orientations of the facets of different pixels are arranged to have a random variation around different average orientations predefined in a region-based manner, resulting in regionally different average reflection directions of the pixels. - View Dependent Claims (22)
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Specification