Data carrier having identifiers
AssigneeGiesecke & Devrient GmbH
InventorsGünter Endres, Georg Kruse, Josef Riedl
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Abstract
The invention relates to a data carrier into which, by means of a laser beam, identifiers are introduced that are visible in the form of irreversible changes, caused by the laser beam, in the optical properties of the data carrier. According to the present invention, the data carrier comprises a laser-sensitive layer (20) that is opaque in the visible spectral range, and that is combined with a securing layer (22) that is metallized at least in a sub-area, the identifiers (30, 32) being introduced by the laser beam simultaneously and in perfect register into the laser-sensitive layer (20) and the metallized sub-area (24) of the securing layer (22).
Claims13
A data carrier having identifiers, wherein into said data carrier by means of a laser beam, identifiers are introduced that are visible in the form of irreversible changes in the optical properties of the data carrier, caused by the laser beam, wherein:
- the data carrier comprises, in the stated order, a first metal layer, a transparent foil, a second metal layer and a fluorescent layer, and;
- the identifiers are introduced into the first metal layer and the second metal layer simultaneously and in perfect register, the identifiers being gaps in the metal layers that are produced by metal ablation by means of the laser beam wherein the fluorescent layer can be seen through the gaps in the metal layers.
Dependencies are inferred from the claim text.