See-through security element with microstructures
First Claim
Patent Images
1. A see-through security element for security papers and value documents, comprising:
- a see-through region in the security element,wherein the see-through region includes at least one micropattern formed from an arrangement of a plurality of pattern elementswherein the see-through region is capable of allowing visible light to be transmitted therethrough,wherein the at least one micropattern is not visible in the transmitted visible light when seen looking toward the see-through region in a direction perpendicular to a plane of the security element, andwherein the at least one micropattern is visible in the transmitted visible light when seen looking at the see-through region at an angle oblique to the perpendicular direction.
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Abstract
The present invention relates to a see-through security element (12), for security papers, value documents and the like, having at least one micropattern having a visual appearance that is viewing-angle dependent when looked through (26, 28). According to the present invention, the at least one micropattern is formed from an arrangement of a plurality of pattern elements (24) having a characteristic pattern spacing of 1 μm or more, and the see-through security element (12) exhibits a total thickness of 50 μm or less.
65 Citations
32 Claims
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1. A see-through security element for security papers and value documents, comprising:
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a see-through region in the security element, wherein the see-through region includes at least one micropattern formed from an arrangement of a plurality of pattern elements wherein the see-through region is capable of allowing visible light to be transmitted therethrough, wherein the at least one micropattern is not visible in the transmitted visible light when seen looking toward the see-through region in a direction perpendicular to a plane of the security element, and wherein the at least one micropattern is visible in the transmitted visible light when seen looking at the see-through region at an angle oblique to the perpendicular direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification