Security element comprising micro-reflectors for a perspective representation of a motif

Patent metadata

Field	Value
Publication number	US-11325412-B2
Application number	US-201917283419-A
Country	US
Kind code	B2
Filing date	Oct 9, 2019
Priority date	Oct 15, 2018
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A flat security element with microreflectors arranged as a microreflector pattern in a main plane of the security element. The microreflectors present a motif made up of image points to a viewer. The motif appears for the viewer as lying outside the main plane of the security element. Two of the microreflectors are adjusted in each case to produce one of the image points of the motif appearing for the viewer as lying outside the main plane. The microreflector pattern has several groups of microreflectors. Each of the groups is provided to represent to the viewer a perspective view of the motif after tilting the security element about an axis lying in the main plane. Image points of the motif are shifted by shift ranges of different sizes through the tilting.

First claim

The invention claimed is:

1. A flat security element with microreflectors, wherein
the microreflectors are arranged as a microreflector pattern in a main plane of the security element,
the microreflectors present a motif made up of image points to a viewer,
the motif lies outside the main plane of the security element for the viewer, in that two of the microreflectors are adjusted in each case in order to produce one of the image points of the motif lying outside the main plane for the viewer,
the microreflector pattern has several groups of microreflectors,
each of the groups is provided in order to represent for the viewer a perspective view of the motif after the security element has been tilted about an axis lying in the main plane,
wherein different image points of the motif are shifted by differently large shift ranges through the tilting, each shift range being defined as the length of the distance by which an image point moves in.

2. The security element according to claim 1 , wherein the motif is a contour line representation, wherein the shift range changes continuously along the contour line.

3. The security element according to claim 2 , wherein the contour line as the represented motif is point-symmetrical to a center,
wherein the distance from the center or from a circle around the center is modulated according to a function with which the shift range is also modulated.

4. The security element according to claim 1 , wherein the security element comprises two motifs,
wherein the shift ranges of the image points of the two motifs lie at different intervals.

5. The security element according to claim 1 , wherein the image points of the motif appear for the viewer at a different distance to the main plane.

6. The security element according to claim 1 , wherein the image points shift in the same direction as the direction of tilting movement when tilted and the image points appear to float in front of the main plane.

7. The security element according to claim 1 , wherein the image points of the motif or image points of a second motif shift in the opposite direction to the direction of the tilting movement when tilted and the image points appear to lie behind the main plane.

8. The security element according to claim 1 , wherein the motif changes its perspective appearance in a conical region around a perpendicular to the main plane.

9. The security element according to claim 1 , wherein microreflectors of a group in the microreflector pattern are at least partially arranged at different grid positions.

10. The security element according to claim 1 , wherein the security element is adapted for a viewing distance of 20-50 cm and/or the contour line has a width of over 1 mm.

11. The security element according to claim 1 , wherein the motif has a center and the shift range depends at least in sections on a distance to the center.

12. The security element according to claim 1 , wherein the motif as a whole does not show a movement effect when tilted or is represented with a rotation or translation that is uniform for all image points of the motif.

13. A value document with a security element according to claim 1 .

14. A manufacturing method for a flat security element, in particular according to claim 1 , wherein
a flat substrate that defines a main plane due to this shape is equipped with microreflectors that are arranged in a microreflector pattern and each have an alignment so that they together present at least one motif made up of image points and appearing in perspective, wherein two of the microreflectors are adjusted in each case in order to produce one of the image points of the motif lying outside the main plane for the viewer,
the microreflector pattern is formed with several groups of microreflectors, wherein each group is assigned to a perspective view of the motif with regard to the alignment of their microreflectors, so that when the security element is tilted about an axis lying in the main plane the motif changes its perspective appearance, and
shift ranges of different sizes are assigned to image points of the motif when tilted by a tilt angle.

15. The manufacturing method according to claim 14 , wherein the microreflectors of the microreflector pattern for different views are at least partially arranged at different grid positions of a recurring grid in the microreflector pattern.

16. The manufacturing method according to claim 14 , wherein the motif is a contour line representation,
wherein the distance of the contour line from a center of the motif or from a circle around the center is modulated according to a function with which the shift range is also modulated.

17. A flat security element with microreflectors, wherein
the microreflectors are arranged as a microreflector pattern in a main plane of the security element,
the microreflectors present a motif made up of image points to a viewer,
the motif lies outside the main plane of the security element for the viewer, in that two of the microreflectors are adjusted in each case in order to produce one of the image points of the motif lying outside the main plane for the viewer,
the microreflector pattern has several groups of microreflectors,
each of the groups is provided in order to represent for the viewer a perspective view of the motif after the security element has been tilted about an axis lying in the main plane,
wherein different image points of the motif are shifted by differently large shift ranges through the tilting, each shift range being defined as the length of the distance by which an image point moves in,
wherein each shift range is proportional to the distance from the main plane to the image point.

Assignees

• Giesecke & Devrient Currency Technology Gmbh

Inventors

• Scherer Kai Hermann
• Dehmel Raphael
• Scherer Maik Rudolf Johann

Classifications

• B42D25/324 Primary

  Reliefs · CPC title

• B42D25/351

  Translucent or partly translucent parts, e.g. windows · CPC title

• B42D25/29

  Securities; Bank notes · CPC title

• B42D25/425

  by deformation, e.g. embossing · CPC title

• G02B5/12

  Reflex reflectors · CPC title