Security document with attached security device which demonstrates increased harvesting resistance
A security document has a security substrate, a security device and a structural weakness element, wherein the security device is coupled to the security substrate, wherein the structural weakness element is integrated with at least one of the security substrate or the security device, the structural weakness element defining an anti-harvesting area and a bulk area, and wherein the anti-harvesting area has one or more of structural fidelity or optical fidelity with the bulk area.
1. A security document, comprising:
a security substrate;
a security device,
wherein the security device comprises an array of image icons, an optical spacer and an array of focusing elements, wherein the array of focusing elements projects a synthetically magnified image of image elements within the array of image icons,
wherein the array of focusing elements is disposed on the optical spacer and comprises a polymeric material; and
a structural weakness element,
wherein the security device is coupled to the security substrate,
wherein the structural weakness element comprises a set of perforations extending through the array of focusing elements,
wherein the structural weakness element is not visible in reflected light; and
wherein the structural weakness element does not affect the synthetically magnified image of image elements projected by the array of focusing elements.
2. The security document of claim 1 , wherein the security device is a micro-optic security device.
3. The security document of claim 1 , wherein the set of perforations comprises perforations which extend at either a normal or oblique angle relative to a plane parallel to a top surface of the security device.
4. The security document of claim 1 , wherein the set of perforations extends through at least a portion of a depth of the optical spacer.
5. The security document of claim 1 , wherein the set of perforations:
extends fully through the security device.
6. The security document of claim 1 , wherein the set of perforations extends through a major portion of the security substrate.
7. The security document of claim 1 , wherein all perforations of the set of perforations have substantially a same shape and same lateral dimensions parallel to a surface of the security document and same axial dimensions perpendicular to a surface of the security substrate.
8. The security document of claim 1 , wherein perforations of the set of perforations have different shapes or different lateral dimensions parallel to a surface of the security substrate or different axial dimensions perpendicular to a surface of the security substrate.
9. The security document of claim 1 , wherein the set of perforations is located wholly within the security device.
10. The security document of claim 1 , wherein the set of perforations extends beyond boundaries of the security device.
11. The security document of claim 1 , wherein the security document is a banknote.
12. The security document of claim 1 , wherein the security document is a banknote, and the set of perforations comprises a serial number for the banknote, and extends across boundaries of the security device.
13. The security document of claim 1 , wherein the set of perforations forms a pattern visible in transmitted light.
14. The security document of claim 1 , wherein the set of perforations comprises one or more of line-shaped perforations or polygon-shaped perforations.
15. The security document of claim 1 , wherein the set of perforations extends fully across a width of the security device, cutting the security device into smaller pieces.
16. A method for making a security document, comprising:
providing a security device coupled to a security substrate,
wherein the security device comprises an array of image icons, an optical spacer and an array of focusing elements,
wherein the array of focusing elements projects a synthetically magnified image of image elements within the array of image icons,
wherein the array of focusing elements is disposed on the optical spacer and comprises a polymeric material; and
integrating a structural weakness element into the security device, wherein the structural weakness element comprises a set of perforations extending through the array of focusing elements,
wherein the security device is coupled to the security substrate before integration of the structural weakness element,
wherein the structural weakness element is not visible in reflected light, and
wherein the structural weakness element does not affect the synthetically magnified image of image elements projected by the array of focusing elements.
17. A security document made in accordance with the method of claim 16 .