Optically variable areal pattern
AssigneeGiesecke+Devrient Currency Technology GmbH
InventorChristian Fuhse
Life of this patent
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Abstract
An optically variable areal pattern has a reflection layer and a micromirror arrangement comprising a plurality of semitransparent micromirrors developed on the reflection layer. The micromirrors are inclined with respect to the reflection layer, such that, by specular reflection, light incident on the micromirror arrangement is reflected on the semitransparent micromirrors. The incident light is reflected partly in a first direction and partly in a second direction that is different from the first direction, in that it passes through the semitransparent micromirrors, impinges on the reflection layer, and is reflected there and, thereafter, again passes through the semitransparent micromirrors.
Claims20
An optically variable areal pattern comprising:
- a reflection layer;
- and
- a micromirror arrangement developed on the reflection layer, the micromirror arrangement comprising a plurality of semitransparent micromirrors;
- wherein the semitransparent micromirrors are inclined with respect to the reflection layer, such that, by specular reflection, light incident on the micromirror arrangement is reflected on the semitransparent micromirrors, partly in a first direction and partly in a second direction that is different from the first direction, in that it passes through the semitransparent micromirrors, impinges on the reflection layer, is reflected there and, thereafter, again passes through the semitransparent micromirrors.
An optically variable areal pattern comprising:
- a reflection layer;
- and
- a micromirror arrangement developed on the reflection layer, the micromirror arrangement comprising a plurality of semitransparent micromirrors;
- wherein the semitransparent micromirrors are inclined with respect to the reflection layer, such that, by specular reflection, light incident on the micromirror arrangement is reflected on the semitransparent micromirrors, partly in a first direction and partly in a second direction that is different from the first direction, in that it passes through the semitransparent micromirrors, impinges on the reflection layer, is reflected there and, thereafter, again passes through the semitransparent micromirrors, and
- wherein the micromirror arrangement comprises a transparent or semitransparent layer developed on the reflection layer, the side of the transparent or semitransparent layer facing away from the reflection layer being patterned in a predetermined region to develop the micromirrors, and
- wherein the semitransparent micromirrors in the predetermined region further comprise a semi-reflective coating developed on the side of the transparent or semitransparent layer facing away from the reflection layer.
Dependencies are inferred from the claim text.