US 12,227,021 B2
Security document including a transparent window formed in the substrate thereof
Arnaud Crassous, La Tour-de-Peilz (CH); Robert Stewart, La Tour-de-Peilz (CH); and Robert Stierman, Alphen aan den Rijn (NL)
Assigned to KOENIG & BAUER AG, Würzburg (DE)
Appl. No. 18/722,671
Filed by KOENIG & BAUER AG, Würzburg (DE)
PCT Filed Apr. 6, 2023, PCT No. PCT/EP2023/059176
§ 371(c)(1), (2) Date Jun. 21, 2024,
PCT Pub. No. WO2023/213494, PCT Pub. Date Nov. 9, 2023.
Claims priority of application No. 10 2022 111 097.4 (DE), filed on May 5, 2022.
Prior Publication US 2024/0416672 A1, Dec. 19, 2024
Int. Cl. B42D 25/351 (2014.01); B42D 25/29 (2014.01); B42D 25/324 (2014.01); B42D 25/369 (2014.01); B42D 25/382 (2014.01); B42D 25/387 (2014.01)
CPC B42D 25/351 (2014.10) [B42D 25/324 (2014.10); B42D 25/369 (2014.10); B42D 25/382 (2014.10); B42D 25/387 (2014.10); B42D 25/29 (2014.10)] 11 Claims
OG exemplary drawing
 
1. A security document including:
a substrate having a transparent window formed in the substrate;
a micro-optical structure composed of microlenses being arranged on a first side of the substrate, at least in a region of the transparent window, and at least one first print image being arranged on a second side of the substrate, located opposite the micro-optical structure, at least in the region of the transparent window;
the at least one first print image including a plurality of image elements in a punctiform or linear grid;
a dot size or a line thickness of the image elements being smaller than a lens width of the microlenses arranged in the micro-optical structure;
a layer being arranged on and covering at least a section of the at least one first print image, on a side of the at least one first print image facing away from the micro-optical structure; and
the layer covering at least the section of the at least one first print image being created in an ink jet printing method,
wherein:
the layer is designed to allow electromagnetic radiation having a wavelength in a range of 380 nm to 780 nm to pass,
a degree of transparency of the layer with respect to the electromagnetic radiation is in a range between 10% and 90%;
the transparency is designed so as to vary over a two-dimensional planar portion of the layer covering at least the section of the at least one first print image so that at least one area of the layer is designed to have a different degree of transparency than other areas of the layer;
a second print image is arranged on the layer covering at least the section of the at least one first print image, on a side of the layer facing away from the micro-optical structure; and
the second print image is arranged on the layer covering at least the section of the at least one first print image in such a way that the second print image can be brought into alignment with the micro-optical structure arranged on the first side of the substrate after carrying out a folding process at a bending line, so that the second print image, or at least a piece of information contained therein, is visible when viewed from a direction of the micro-optical structure.