Method for producing security elements, and security elements

Patent metadata

Field	Value
Publication number	US-10583680-B2
Application number	US-201615541181-A
Country	US
Kind code	B2
Filing date	Jan 5, 2016
Priority date	Jan 9, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A method for producing security elements, security elements, a security document with at least one security element as well as a transfer film with at least one security element wherein a three-dimensional object is recorded and a surface profile of the three-dimensional object, described by a function F(x,y), is determined, wherein the function F(x,y) describes the distance between the surface profile and a two-dimensional reference surface spanned by co-ordinate axes x and y at the co-ordinate points x and y. A first microstructure is determined in such a way that the structure height of the first microstructure is limited to a predetermined value smaller than the maximum distance between the surface profile and the two-dimensional reference surface, and the first microstructure provides an observer with a first optical perception which corresponds to the surface profile of the three-dimensional object described by the function F(x,y).

First claim

The invention claimed is:

1. A method for producing a security element wherein, in one or more first zones, a first microstructure is produced, by means of lithographic methods, wherein the first microstructure is molded in such a way that the first microstructure provides an observer with a first optical perception which corresponds to a spatial perception of a first object, and, in one or more second zones, a second microstructure is produced, by registered exposure, wherein the second microstructure is molded in such a way that the second microstructure provides the observer with a second optical perception which corresponds to a multicolored representation of the first object, and wherein the first microstructure and the second microstructure are produced in such a way that the first optical perception of the first object and the second optical perception of the first object can be perceived by the observer at the same time.

2. A security element, wherein the security element has, in one or more first zones, a first microstructure, wherein the first microstructure is molded in such a way that the first microstructure provides an observer with a first optical perception which corresponds to a spatial perception of a first object, wherein, in one or more second zones, the security element has a second microstructure produced by registered exposure, wherein the second microstructure is molded in such a way that the second microstructure provides the observer with a second optical perception which corresponds to a multicolored representation of the first object, and wherein the first optical perception of the first object and the second optical perception of the first object can be perceived by the observer at the same time.

3. The security element according to claim 2 , wherein the first microstructure has a binary surface relief, a multi-step surface relief or a continuous surface relief.

4. The security element according to claim 2 , wherein at least one of the parameters azimuthal angle, grating period or grating depth of the first microstructure is varied pseudo-randomly within a predefined variation range.

5. The security element according to claim 2 , wherein the multicolored representation of the first object comprises at least two different primary colors of the RGB color space.

6. The security element according to claim 5 , wherein the different primary colors lie in the wavelength range from 380 nm to 780 nm.

7. The security element according to claim 2 , wherein the second microstructure is a true color hologram and/or an optically diffractive active grating structure.

8. The security element according to claim 7 , wherein the one or more first zones and the one or more second zones are gridded into each other.

9. The security element according to claim 2 , wherein the one or more first zones and the one or more second zones are arranged according to a grid.

10. The security element according to claim 9 , wherein, in each case, a first zone of the one or more first zones is arranged adjacent to a second zone of the one or more second zones and the one or more first zones are arranged alternating with the one or more second zones.

11. The security element according to claim 9 , wherein the grid widths are smaller than 300 μm.

12. The security element according to claim 9 , wherein the grid is a one-dimensional grid, spanned by the x- or the y-axis.

13. The security element according to claim 12 , wherein the one-dimensional grid is formed in the shape of sinuous lines or wavy lines.

14. The security element according to claim 12 , wherein the grid width of the one-dimensional grid varies in the direction of the x-axis or of the y-axis within a predefined variation range.

15. The security element according to claim 9 , wherein the grid is a two-dimensional grid, spanned by the x- and the y-axis.

16. The security element according to claim 15 , wherein the grid is a periodic grid.

17. The security element according to claim 15 , wherein the grid width is varied within a predefined variation range.

18. The security element according to claim 2 , wherein the proportion of the one or more first zones in the total surface area consisting of the one or more first zones and the one or more second zones is between 10% and 90%.

19. A security document with at least one security element according to claim 2 .

20. A transfer film with at least one security element according to claim 2 , wherein the at least one security element is detachably arranged on a carrier film of the transfer film.

21. A laminating film with at least one security element according to claim 2 , wherein the at least one security element is incorporated in the laminating film.

22. A security element, wherein the security element has, in one or more first zones, a first microstructure, wherein the first microstructure is molded in such a way that the first microstructure provides an observer with a first optical perception which corresponds to a spatial perception of a first object, wherein, in one or more second zones, the security element has a second microstructure, wherein the second microstructure is molded in such a way that the second microstructure provides the observer with a second optical perception which corresponds to a multicolored representation of the first object, and wherein the first optical perception of the first object and the second optical perception of the first object can be perceived by the observer at the same time, and
wherein the first microstructure is molded in a layer of the security element in such a way that the structure height of the first microstructure is limited to a predetermined value smaller than the maximum distance between a surface profile of a three-dimensional object described by a function F(x,y) and a two-dimensional reference surface spanned by co-ordinate axes x and y, wherein the function F(x,y) describes the distance between the surface profile and the two-dimensional reference surface at the co-ordinate points x and y, and wherein the first optical perception provided to the observer by the first microstructure corresponds to the surface profile of the three-dimensional object described by the function F(x,y).

23. The security element according to claim 22 , wherein the layer of the security element comprising the first microstructure comprises a reflective layer.

24. The security element according to claim 22 , wherein the surface profile described by the function F(x,y) comprises one or more alphanumeric characters, geometric figures, portraits and/or other objects or motifs.

25. The security element according to claim 22 , wherein the function F(x,y) is a function that is continuous in some areas and differentiable in some areas.

26. The security element according to claim 22 , wherein the first microstructure is molded in such a way that the first microstructure brings about a deflection of incident light in the same directions as those in which the surface profile described by the function F(x,y) deflects incident light.

27. A security element, wherein the security element has, in one or more first zones, a first microstructure, wherein the first microstructure is molded in such a way that the first microstructure provides an observer with a first optical perception which corresponds to a spatial perception of a first object, wherein, in one or more second zones, the sec

Assignees

• Ovd Kinegram Ag

Inventors

• Tompkin Wayne Robert
• Schilling Andreas
• Mader Sebastian

Classifications

• B42D15/00 Primary

  Printed matter of special format or style not otherwise provided for · CPC title

• B42D25/328

  Diffraction gratings; Holograms · CPC title

• G02B5/1861

  Reflection gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials (G02B5/1809, G02B5/1828, G02B5/1833, G02B5/1838 and G02B5/1847 take precedence) · CPC title

• G07D7/207

  Matching patterns that are created by the interaction of two or more layers, e.g. moiré patterns · CPC title

• B42D25/20 Primary

  characterised by a particular use or purpose · CPC title