Koenig & Bauer-Aktiengesellschaft

Arnaud Crassous

Robert Stierman

Robert Stewart

A security document includes a substrate having a transparent window formed in the substrate. A micro-optical structure including microlenses is arranged on one side of the substrate. A first print image is arranged on the other side of the substrate, opposite the micro-optical structure, and includes image elements having a dot size or line thickness smaller than a lens width of the microlenses. A layer is arranged on part of the first print image on the side facing away from the micro-optical structure. A second print image is arranged on the layer, facing away from the micro-optical structure, and so that the second print image can be brought into alignment with the micro-optical structure after folding the substrate at a bending line so that the second print image, or at least a piece of information contained therein, becomes visible and/or recognizable when viewed from a direction of the micro-optical structure.

Security document including a transparent window formed in the substrate thereof

Examples include a security document having a substrate with a transparent window. In the region of the transparent window, a micro-optical structure including microlenses is arranged on one side of the substrate and a first print image is arranged on the other side of the substrate, opposite the micro-optical structure. A layer covers at least a section of the first print image. The layer allows electromagnetic radiation having a wavelength in the range of 380 nm to 780 nm to pass with a transparency in a range between 10% and 90%. The transparency gradually varies over a planar extension of the layer. A second print image is arranged on the layer in such a way that the second print image, or at least a piece of information contained therein, can be brought into alignment with the micro-optical structure after carrying out a folding process and becomes visible and/or recognizable.

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La Tour-de-Peilz, Switzerland

Arnaud Crassous