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US 5,817,205 AGranted
Method and apparatus for making paper of value having an optically variable security element
AssigneeGiesecke & Devrient GmbH
InventorWittich Kaule
Life of this patent
Estimating the term…
Abstract
A method and apparatus for making a data carrier (1) such as a paper of value or the like having an optically variable element (5,6) such as a hologram, applied to the surface, and an additional printed pattern (2), applied for example by steel intaglio printing, wherein the surface of the data carrier (15,16,20,21) is made smoother in the area of the optically variable element than in the remaining surface and the optically variable element is applied to the smoother area.
Claims8
A method for producing a data carrier with an optically variable element, comprising the steps of:
- providing a paper substrate with a first finished surface area having a first surface roughness that produces distortion of a film optical element bonded thereon;
- calendaring and thereby compressing the substrate at a pressure causing a depression below the surface of the first finished area in a partial area of the first finished surface area to produce a second finished surface area with a second surface roughness that will not distort a film optical element bonded thereon;
- applying a film optical element to at least a partial area of the second finished surface area.
Dependencies are inferred from the claim text.