Optically variable security arrangement

Patent metadata

Field	Value
Publication number	US-11345179-B2
Application number	US-201816628397-A
Country	US
Kind code	B2
Filing date	Jul 6, 2018
Priority date	Jul 7, 2017
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

An optically variable security arrangement for securing valuable articles, comprises a first sub-element having a two-dimensional relief grid composed of a plurality of grid elements and that has, in at least one spatial direction R 1 , a first line screen p below 500 μm, and in which the grid elements are each formed from at least two relief elements that are directionally reflective in different directions, and a second sub-element having at least one dot and/or line grid that, in a spatial direction R 2 , has a second line screen q. A movement effect is created by the interplay of the relief grid and the dot and/or line grid when the security arrangement is tilted.

First claim

The invention claimed is:

1. An optically variable security arrangement for securing valuable articles, comprising:
a first sub-element having a two-dimensional relief grid that is composed of a plurality of grid elements and that has, in at least one spatial direction R 1 , a first line screen p below 500 μm, and in which the grid elements are each formed from at least two relief elements that are directionally reflective in different directions; and
a second sub-element having at least one dot and/or line grid that, in a spatial direction R 2 , has a second line screen q;
wherein the first and second sub-elements, in a verification position, are stacked vertically in such a way that said spatial direction R 1 of the first sub-element is parallel to said spatial direction R 2 of the second sub-element and a vertical spacing between the relief grid and the dot and/or line grid is less than half of the line screen p;
wherein the second line screen q differs only slightly from the first line screen p, by less than one-fifth, and/or the first line screen p and/or the second line screen q being location-dependently modulated such that, in said verification position, a movement effect is created by an interplay of the relief grid and the dot and/or line grid when the security arrangement is tilted;
wherein the grid elements of the first sub-element each produce substantially a reflection behavior of a given curvature, being concave and/or convex, that is defined at each position by a normalized local normal vector; and
wherein the grid elements of the first sub-element including, as directionally reflective relief elements, a plurality of micromirrors whose inclination against an x-y plane of the first sub-element is determined by indicating its normalized normal vector, and the normal vector of a micromirror at a position (x 0 ,y 0 ) being determined by the local normal vector of the given curvature at said position, modified, by a random or pseudorandom angle modulation of the normal vector in at least one spatial direction.

2. The security arrangement according to claim 1 , wherein only in one spatial direction is there a modification by a random or pseudorandom angle modulation of the normal vector, the angle modulation having a maximum value of less than 5°.

3. The security arrangement according to claim 1 , wherein there is a modification by a random or pseudorandom angle modulation of the normal vector in two spatial directions that are perpendicular to each other, the maximum angle modulation being of different sizes in the two spatial directions and a larger maximum angle modulation being at least 2 times larger than the smaller maximum angle modulation.

4. The security arrangement according to claim 1 , wherein the grid elements of the first sub-element produce substantially the reflection behavior of a concave or convex mirror, the reflection behavior being of a parabolic concave or parabolic convex mirror.

5. An optically variable security arrangement for securing valuable articles, comprising:
a first sub-element having a two-dimensional relief grid that is composed of a plurality of grid elements and that has, in at least one spatial direction R 1 , a first line screen p below 500 μm, and in which the grid elements are each formed from at least two relief elements that are directionally reflective in different directions; and
a second sub-element having at least one dot and/or line grid that, in a spatial direction R 2 , has a second line screen q;
wherein the first and second sub-elements, in a verification position, being stacked vertically in such a way that said spatial direction R 1 of the first sub-element is parallel to said spatial direction R 2 of the second sub-element and a vertical spacing between the relief grid and the dot and/or line grid is less than half of the line screen p;
wherein the second line screen q differs only slightly from the first line screen p, by less than one-fifth, and/or the first line screen p and/or the second line screen q being location-dependently modulated such that, in the verification position, a movement effect is created by an interplay of the relief grid and the dot and/or line grid when the security arrangement is tilted; and
wherein the relief elements of at least a portion of the grid elements are arranged aperiodically in an areal region of the respective grid element.

6. The security arrangement according to claim 5 , wherein the relief elements are formed by micromirrors that are inclined against an x-y plane of the first sub-element and the micromirrors are arranged in varying shapes and/or sizes in the areal region of the respective grid element.

7. The security arrangement according to claim 5 , wherein the micromirrors in the plane of the areal region of the respective grid element have a minimum dimension of 2 μm or more.

8. The security arrangement according to claim 5 , wherein the relief elements of all grid elements are arranged aperiodically in the areal region of the respective grid element.

9. The security arrangement according to claim 1 , wherein the first sub-element and the second sub-element are firmly joined together in the verification position.

10. The security arrangement according to claim 1 , wherein, in a sub-region, the two-dimensional relief grid includes first and second optically equivalent grid elements whose composition composed of relief elements differs and/or in which the arrangement of the relief elements differs, the first and second grid elements being arranged in the form of a motif, not visible with a naked eye, in the form of a pattern, characters or a code.

11. The security arrangement according to claim 10 , wherein the first and second grid elements differ in the spatial arrangement of the relief elements within the grid elements, wherein the relief elements of the first grid elements are arranged periodically and the relief elements of the second grid elements aperiodically, or vice versa.

12. The security arrangement according to claim 10 , wherein the first and second grid elements differ in the contour shape and/or size of the relief elements included.

13. The security arrangement according to claim 10 , wherein the first and second grid elements differ by the angle modulation of the normal vector in at least one spatial direction.

14. A data carrier having a security arrangement according to claim 1 , at least one line grid of the security arrangement covering the relief grid in sub-regions and, in sub-regions outside of the relief grid, extending to the data carrier provided with the security arrangement.

15. The security arrangement according to claim 5 , wherein the first sub-element and the second sub-element are firmly joined together in the verification position.

16. The security arrangement according to claim 5 , wherein, in a sub-region, the two-dimensional relief grid includes first and second optically equivalent grid elements whose composition composed of relief elements differs and/or in which the arrangement of the relief elements differs, the first and second grid elements being arranged in the form of a motif, not visible with a naked eye, in the form of a pattern, characters or a code.

17. The security arrangement according to claim 16 , wherein the first and second grid elements differ in the spatial arrangement of the relief elements within the grid elements, wherein the relief elements of the first grid elements are arranged periodically and the relief elements of the second grid elements aperiodically, or vice versa.

18. The securit

Assignees

• Giesecke & Devrient Currency Technology Gmbh

Inventors

• Imhof Martin
• Dehmel Raphael
• Fuhse Christian

Classifications

• B42D25/29

  Securities; Bank notes · CPC title

• B42D25/23 Primary

  Identity cards · CPC title

• B42D25/324 Primary

  Reliefs · CPC title

• B42D25/24

  Passports · CPC title

• B42D25/21

  for multiple purposes · CPC title