Giesecke & Devrient Gmbh

Giesecke+devrient Mobile Security Gmbh

Georg Kruse

Günter Endres

Josef Riedl

Matthias Bergmann

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 () that is opaque in the visible spectral range, and that is combined with a securing layer () that is metallized at least in a sub-area, the identifiers () being introduced by the laser beam simultaneously and in perfect register into the laser-sensitive layer () and the metallized sub-area () of the securing layer ().

Data carrier having identifiers

The invention relates to a data carrier into which, by a laser beam, identifiers () are introduced in the form of patterns, letters, numbers and/or images that are visible due to local changes in the optical properties of the data carrier, effected by the laser beam and resulting from material transformations. According to the present invention, the data carrier comprises a laser-sensitive recording layer () that is transparent in the visible spectral range and that is provided with a surface relief in the form of a lens grid (). The identifiers are introduced with the laser beam from different directions through the lens grid () into the recording layer () and are perceptible when later viewed from those same directions. The data carrier is transparent at least in the area of the introduced identifiers ().

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Aschheim, Germany

Georg Kruse