Optically variable security element
View Patent ↗An optically variable security element has a motif region. A plurality of differently oriented facets are arranged in the motif region. A pattern includes visible pattern elements is visible in the motif region to a viewer at least at a first viewing angle. The visible pattern elements are designed differently to portray a motif to the viewer. The motif is a three-dimensional motif. The pattern elements are designed differently such that they portray a perspective of the three-dimensional motif to the viewer.
1. An optically variable security element having a motif region, wherein
(a) a multiplicity of variously aligned facets are arranged in the motif region,
(b) a pattern having visible pattern elements is visible to a viewer in the motif region at least at a first viewing angle,
(c) wherein the visible pattern elements have shapes that are differently configured in order to represent a motif for the viewer,
(d) wherein the motif is a three-dimensional motif that imparts an impression to a viewer that a pattern having pattern elements with identical shapes has been placed on a three-dimensional surface, and
(e) wherein the shapes of the pattern elements are differently configured such that they represent a perspective of the three-dimensional motif for the viewer.
2. The optically variable security element according to claim 1 , wherein during tilting of the optically variable security element about an axis which lies in a plane of the security element, a kinematic effect is perceptible to the viewer in the pattern, a movement of at least one of the pattern elements or a movement of the three-dimensional motif or a movement of an additional independent motif in the motif region.
3. The optically variable security element according to claim 2 , wherein the kinematic effect is perceptible to the viewer by:
a variation of contours of pattern elements; and/or
by a variation of positions of pattern elements; and/or
by a variation of areas of the pattern elements; and/or
by a variation of sizes of the pattern elements; and/or
by a variation of shapes of the pattern elements; and/or
by a variation of a position of a brightly acting first perceptible section that exhibits a higher relative reflected light intensity in a direction of the viewer than a second perceptible section.
4. The optically variable security element according to claim 2 , wherein the kinematic effect is a movement of an independent additional motif, including a movement of an additional motif having an independent geometrical motif shape, comprising a brightly acting first perceptible section or is a brightly acting first perceptible section, wherein the brightly acting first perceptible section exhibits a higher relative reflected light intensity in a direction of the viewer than a second perceptible section.
5. The optically variable security element according to claim 1 , wherein the visible pattern elements comprise:
perspectively distorted pattern elements, which are visible to the viewer in the motif in such a way that the pattern elements are perceptible as converging at a common vanishing point, and/or
undistorted pattern elements, which are visible to the viewer outside the motif.
6. The optically variable security element according to claim 1 , wherein a first pattern element of the pattern elements is perspectively distorted differently than a second pattern element of the pattern elements in such a way that the pattern elements are perceptible as converging at a common vanishing point.
7. The optically variable security element according to claim 1 , wherein the pattern elements are:
submotifs; or
line pattern elements, including L-shaped or cruciform pattern elements; or
area pattern elements, including filled area pattern elements; or
area contour pattern elements, including pattern elements having a contour or a frame.
8. The optically variable security element according to claim 1 , wherein the visible pattern elements are independent pattern elements or connected pattern elements.
9. The optically variable security element according to claim 1 , wherein a first kinematic effect is perceptible to the viewer in the pattern by tilting the optically variable security element about a first axis which lies in a plane of the security element, and a second kinematic effect is perceptible to the viewer in the pattern by tilting the optically variable security element about a second axis which lies in a plane of the security element, the first axis and the second axis being nonparallel.
10. The optically variable security element according to claim 9 , wherein the first kinematic effect is a movement of the pattern elements or a movement of the three-dimensional motif.
11. The optically variable security element according to claim 9 , wherein the second kinematic effect is a movement of additional, independent, motif, including a movement of a brightly acting first perceptible section that exhibits a higher relative reflected light intensity in a direction of the viewer than a second perceptible section.
12. The optically variable security element according to claim 1 , wherein the motif is perceptible to the viewer in the pattern as a nonplanar or curved surface of the pattern.
13. The optically variable security element according to claim 1 , wherein at least some of the pattern elements are perceptible in a regular or irregular grid, wherein pattern elements are perceptible in a regular grid outside the motif and an irregular grid inside the motif, the irregular grid inside the motif having an impression of a regular grid placed on a three-dimensional object such that a three-dimensional impression is obtained.
14. The optically variable security element according to claim 1 , wherein the motif is perceptible in the pattern by a distortion, including a perspective distortion, of the pattern elements.
15. The optically variable security element according to claim 1 , wherein:
the optically variable security element comprises an arrangement of microreflectors and each of the facets is respectively a surface of a microreflector, wherein the microreflectors are micromirrors; and/or
the facets comprise a relief structure having a reflection-increasing coating, including a metal coating, an optically variable coating; and/or
the arrangement comprises an embossed embossing lacquer layer.
16. The optically variable security element of claim 15 , wherein the optically variable coating is a liquid crystal coating or an optically variable multilayer structure, or an HRI coating.
17. A document of value having an optically variable security element according to claim 1 .