Security document and security element for a security document
AssigneeGiesecke & Devrient GmbH
InventorManfred Heim
Life of this patent
Estimating the term…
Abstract
Security element 2, 4 to be embedded in or applied to a security document so that it is visually recognizable from both sides of security document 1 is of multilayer construction and includes interference element I with a color shift effect and diffraction structures 8. Depending on the arrangement of the layers and existing diffraction structures 8 on transparent substrate S the color shift effect and/or the diffractive effects are perceptible from one or both sides of security element 2, 4. The security element is suitable in particular as two-sided windowed thread 4 and as label or transfer element 2 over hole 3.
Claims37
A security document, or semifinished product for producing the security document, comprising:
- a substrate with first and second opposing substrate surfaces;
- and
- a multilayer security element that is so connected with the substrate that it is visually recognizable at least from one of the two substrate surfaces, wherein the security element includes a multilayer interference element producing a color shift effect and a layer with diffraction structures that at least partly overlaps the interference element wherein the security element is semitransparent, the interference element has gaps in at least one absorber layer, and the diffraction structures directly adjoin the interference element;
- wherein an effect caused by at least one of the diffraction structures and a color shift effect produced by the interference element is visually recognizable from both sides of the security element depending on the way of viewing the security element;
- and wherein the gaps are only present in at least one of the absorber layers.
A security element to be embedded in or applied to a security document wherein the security element includes a multilayer interference element producing a color shift effect and a layer with diffraction structures that at least partly overlaps the interference element, characterized in that the security element is semitransparent, the interference element has gaps in at least one absorber layer, and the diffraction structures directly adjoin the interference element,
- wherein an effect caused by at least one of the diffraction structures and a color shift effect produced by the overlying interference element are visually recognizable from both sides of the security element depending on the way of viewing the security element;
- and wherein the gaps are only present in at least one of the absorber layers.
Transfer material for applying a security element to a document of value, wherein the transfer material includes the following layer structure:
- a multilayer interference element with a color shift effect, and
- a layer with diffraction structures that at least partly overlaps the interference element, characterized in that the security element is semitransparent, the interference element has gaps in at least one absorber layer, and the diffraction structures directly adjoin the interference element,
- wherein an effect caused by at least one of the diffraction structures and a color shift effect produced by the overlying interference element are visually recognizable from both sides of the security element depending on the way of viewing the security element;
- and wherein the gaps are only present in at least one of the absorber layers.
Dependencies are inferred from the claim text.