Security thread having an optically variable security feature
View Patent ↗Embodiments disclosed herein include such relating to security elements for embedment in security papers, value documents and the like, having a substrate foil having opposing first and second main surfaces, an optically variable security feature disposed on the first main surface and an adhesive layer applied to the second main surface. Further embodiments are disclosed including methods for manufacturing security elements, embodiments relating to security papers and value documents, and other embodiments.
1. A security element for embedment in security papers, value documents and the like, having:
a substrate foil having opposing first and second main surfaces, and
an optically variable security feature having viewing-angle-dependent effects disposed on the first main surface;
wherein the first main surface is provided with a first structured adhesive layer in the form of patterns, characters or a code, and the first structured adhesive layer is provided only outside any optically variable security feature, and wherein the second main surface is provided with a second structured adhesive layer in the form of patterns, characters or a code.
2. The security element according to claim 1 , characterized in that the first main surface is provided with the first structured adhesive layer only in border regions.
3. The security element according to claim 2 , characterized in that the first structured adhesive layer of the first main surface is applied in register with the optically variable security feature.
4. The security element according to claim 1 , characterized in that the second structured adhesive layer of the second main surface is applied in register with the optically variable security feature of the first main surface.
5. The security element according to claim 1 , characterized in that the structured adhesive layer of the first and/or second main surface includes a feature substance, especially a magnetic, electrically conductive, luminescent or infrared-absorbing feature substance.
6. The security element according to claim 1 , characterized in that the optically variable security feature includes microlenses, a matte pattern, a hologram, a holographic grating image or another hologram-like diffraction pattern.
7. The security element according to claim 1 , characterized in that the first structured adhesive layer of the first main surface is applied in register with the optically variable security feature.
8. The security element according to claim 1 , characterized in that the first structured adhesive layer of the first main surface and the second structured adhesive layer of the second main surface are applied in register with the optically variable security feature of the first main surface.
9. A security paper for manufacturing value documents or the like, having an at least partially embedded security element according to claim 1 .
10. A value document, such as a banknote, identification card or the like, having an at least partially embedded security element according to claim 1 .
11. A method for manufacturing a security element for embedment in security papers, value documents and the like, having the steps of:
providing a substrate foil having opposing first and second main surfaces,
providing the first main surface with an optically variable security feature having viewing-angle-dependent effects disposed on the first main surface,
providing the first main surface with a first structured adhesive layer in the form of patterns, characters or a code, where the first structured adhesive layer is provided only outside any optically variable security feature, and
providing the second main surface with a second structured adhesive layer in the form of patterns, characters or a code;
thereby manufacturing the security element.
12. The method according to claim 11 , characterized in that the first main surface is provided with the first structured adhesive layer only in border regions.
13. The method according to claim 12 , characterized in that the first structured adhesive layer of the first main surface is applied in register with the optically variable security feature.
14. The method according to claim 11 , characterized in that the second structured adhesive layer of the second main surface is applied in register with the optically variable security feature of the first main surface.
15. The method according to claim 11 , characterized in that the structured adhesive layer of the first and/or second main surface is applied together with a feature substance, especially a magnetic, electrically conductive, luminescent or infrared-absorbing feature substance.
16. The method according to claim 11 , characterized in that the first structured adhesive layer of the first main surface is applied in register with the optically variable security feature.
17. The method according to claim 11 , characterized in that the first structured adhesive layer of the first main surface and the second structured adhesive layer of the second main surface are applied in register with the optically variable security feature of the first main surface.