EP3554846B1 - Procédé permettant de fabriquer un élément de sécurité doté d'une image lenticulaire - Google Patents

Procédé permettant de fabriquer un élément de sécurité doté d'une image lenticulaire Download PDF

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Publication number
EP3554846B1
EP3554846B1 EP17822133.9A EP17822133A EP3554846B1 EP 3554846 B1 EP3554846 B1 EP 3554846B1 EP 17822133 A EP17822133 A EP 17822133A EP 3554846 B1 EP3554846 B1 EP 3554846B1
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EP
European Patent Office
Prior art keywords
microlenses
laser
line width
lenticular image
metallic
Prior art date
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EP17822133.9A
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German (de)
English (en)
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EP3554846A1 (fr
Inventor
Andreas Rauch
Christian Fuhse
Josef Schinabeck
André Gregarek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3554846A1 publication Critical patent/EP3554846A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials

Definitions

  • the invention relates to a method for producing a security element with a lenticular pattern image for displaying one or more target images that are only visible from predetermined viewing directions, the motifs of which are formed by visually recognizable, contrasting metallic and demetallized partial areas of a motif layer.
  • Data carriers such as value or ID documents, but also other valuables, such as branded items, are often provided with security elements for protection, which allow the authenticity of the data carrier to be checked and which also serve as protection against unauthorized reproduction.
  • Security elements with effects that depend on the viewing angle play a special role in securing authenticity, as these cannot be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and/or a different graphic motif depending on the viewing angle.
  • the pamphlet EP 0 219 012 A1 describes an identity card with a partial lenticular structure, through which desired information is written into the card with a laser at different angles. This information can subsequently only be recognized from this angle when viewed, so that the different information appears when the map is tilted.
  • a lenticular pattern image contains a metallic motif layer
  • the motifs shown can be formed by local demetallization of the metallic motif layer.
  • Various possibilities are known for introducing a design into a metallization with a laser by demetallization.
  • the demetallization can be carried out, for example, by direct inscription, in that a laser beam is guided over the metallic motif layer using a suitable scanning device, or also by a larger-area laser impingement using a mask. In both cases, a particular challenge is the generation of demetallized lines of a desired width in the motif layer.
  • a method for producing a security element with a lenticular pattern in which a marking laser source for generating pulsed laser radiation is provided and the pulsed laser radiation in the beam path between the laser source and the lenticular pattern is provided with a motif-shaped beam cross section by a beam shaper or a switchable mask.
  • a plurality of microlenses of the lens raster is simultaneously exposed to the laser beam with the pattern-shaped beam cross-section in order to simultaneously produce a plurality of sub-pattern-shaped demetallized partial areas in the underlying metallic pattern layer.
  • the pamphlet DE 10 2013 007 484 A1 describes a security element with an arrangement of similar microlenses arranged on the first main surface of a central body, a laser-sensitive recording layer arranged on the second main surface of the central body with a large number of micro-characteristics generated by the action of laser radiation, and a mask layer between the arrangement of microlenses and the laser-sensitive recording layer and is arranged outside the focal plane of the microlenses.
  • the pamphlet EP 3 015 279 A1 discloses a method according to the preamble of claim 1.
  • the metallic motif layer is subjected to demetallization with a finely focused laser beam from different angles and thus successively at different points in the focal plane, until the partial areas with the desired line width are demetallized, scanning the entire surface of the lenticular image is usually very complex and tedious.
  • the demetallization can be significantly faster be carried out, but the defocusing produces blurred tilting images with image changes that are no longer clearly defined.
  • the invention is based on the object of specifying a method of the type mentioned at the outset which avoids the disadvantages of the prior art and which, particularly at high production speeds, enables the production of sharply delimited demetallized partial areas of adjustable line width in a lenticular screen image.
  • the lenticular grid image is designed to represent n ⁇ 2 target images, and a line width is selected for the demetallized partial areas to be produced, which is preferably between 0.6*d ML /n and 1.4*d ML /n between 0.8*d ML /n and 1.2*d ML /n, particularly preferably between 0.9*d ML /n and 1.1*d ML /n, where d ML is the diameter of the microlenses.
  • the number n of target images to be displayed is in particular 2, 3, 4 or 5.
  • microlenses are lenses whose size is below the resolution limit of the naked eye in at least one lateral direction.
  • the microlenses can in principle be spherical or aspherical, but the use of plano-convex cylindrical lenses is currently preferred, so that with the method mentioned, a lenticular grid image with a lens grid of a plurality of plano-convex micro-cylindrical lenses is advantageously provided.
  • the term "diameter” always refers to the dimension perpendicular to the cylinder axis.
  • the micro-cylindrical lenses can be of any length; for example, when used in security threads, they can correspond to the overall width of the thread and be several millimeters.
  • the metallic motif layer of the lenticular image is arranged essentially in the focal plane of the microlenses, which means in particular that the distance between the metallic motif layer and the focal plane is less than 25%, preferably less than 10% and particularly preferably less than 5% of the focal length of the microlenses amounts to.
  • the marking laser source is then advantageously selected in such a way that the resolving power D( ⁇ ) deviates from the line width of the demetallized partial areas to be produced by less than 15%, preferably by less than 10%.
  • a readily available laser source is advantageously used as the marking laser source, such as an Nd:YAG laser, a frequency-doubled Nd:YAG laser, a frequency-tripled Nd:YAG laser or an Er:glass laser.
  • the marking laser source such as an Nd:YAG laser, a frequency-doubled Nd:YAG laser, a frequency-tripled Nd:YAG laser or an Er:glass laser.
  • other laser sources with other wavelengths such as the diode lasers available for numerous wavelengths, can also be used as long as they are only suitable for the demetallization of the metallic motif layer. If two or more different laser sources of different wavelengths are used, line widths of different sizes can easily be implemented in a security element.
  • the laser power of the marking laser source is adjusted for fine tuning in order to adapt the line width of the demetallized partial areas produced to the selected line width.
  • a lens raster image whose lens raster has microlenses with a lens diameter between 5 ⁇ m and 20 ⁇ m and whose lens period is between 100% and 125% of the lens diameter.
  • the lens raster can border on air, but in particular it can also be embedded in an embedding layer whose refractive index preferably differs from the refractive index of the microlenses by 0.2 or more.
  • figure 1 shows a schematic representation of a banknote 10 which is provided with a security element according to the invention in the form of a window security thread 12.
  • the window security thread 12 emerges in window areas 14 on the surface of the banknote 10 while being embedded in the interior of the banknote 10 in the land areas 16 lying between them.
  • the security thread 12 shows a tilting image which presents the viewer with a different target image 18A, 18B or 18C from three different viewing directions 30A, 30B, 30C.
  • the target images 18A-18C each show a motif that is formed from visually recognizable and contrasting metallic motif parts 20 and demetallized motif parts 22A, 22B, 22C.
  • the window security thread 12 of the exemplary embodiment shows a sequence of euro symbols 22A against a shiny metallic background 20 when viewed at an angle 30A from above, while a sequence of coat of arms motifs 22B against a shiny metallic background 20 when viewed perpendicularly 30B and a Sequence of number motifs 22C in the form of the denomination "10" against a shiny metallic background 20 is visible.
  • the appearance of the window security thread 12 in the window areas 14 changes back and forth between the three target images 18A, 18B, 18C, depending on the viewing direction.
  • FIG 2 12 schematically shows the structure of the window security thread 12 of FIG 1 in cross section.
  • the window security thread 12 has a carrier 32 in the form of a transparent plastic film, for example a PET film.
  • a motif layer 40 made of aluminum is formed on the underside of the carrier 32 and has demetallized partial regions 42 spaced apart in the grid of the cylindrical lenses 34 .
  • the carrier 32, the cylindrical lenses 34 and the motif layer 40 are matched to one another in such a way that the motif layer 40 is in the focal plane of the cylindrical lenses 34.
  • FIG. 2 For illustration shows figure 2 a section of the lenticular grid image in which the motif layer 40 contains demetallized sub-areas 42 only in the areas 44B visible when viewed perpendicularly 30B.
  • the areas 44A and 44C visible when viewed obliquely from above (viewing direction 30A) or obliquely from below (viewing direction 30C) do not have any demetallization in the section shown, so that the viewer looks at metal areas of the motif layer 40 from these directions.
  • the individual demetallized partial areas 42 represent narrow strips arranged in the grid of the cylindrical lenses, they settle when viewed from the different viewing directions due to the focusing Action of the cylindrical lenses 34 to the desired sequence of motifs 18A - 18C together.
  • the window security thread 12 typically contains further layers, such as a full-surface color layer 45, which allows coloring of the demetallized motif parts 22A - 22C, an opaque white layer 46 and a heat-sealing lacquer layer 48.
  • a full-surface color layer 45 which allows coloring of the demetallized motif parts 22A - 22C
  • an opaque white layer 46 and a heat-sealing lacquer layer 48.
  • these or other functional layers are not essential for the present invention and are therefore not described in detail.
  • the line width D real of the demetallized partial areas 42 is essentially one third of the diameter d ML of the microlenses 34 .
  • the advantageous line width of the demetallized partial areas in a lenticular grid image for the display of two target images is essentially half the microlens diameter, and generally with a number n of target images to be displayed essentially one nth of the diameter d ML of the microlenses. In this way, on the one hand, the available area of the motif layer is optimally utilized and, on the other hand, Tilting the lenticular image achieves a clearly defined switching between the different target images.
  • the motif layer 40 is conventionally scanned with a finely focused laser beam at different angles, for example, until partial areas 42 of the desired width are demetallized, or the motif layer is arranged outside the focal plane of the microlenses 34 to increase the process speed, so that During laser demetallization, an expanded and thus broader image of the incident laser radiation results in the plane of the motif layer.
  • both variants have disadvantages with regard to the process duration or the quality of the target images generated, as already explained above.
  • the solution according to the invention uses the wavelength-dependent resolution of the optical system formed by the microlenses in order to obtain a desired line width without defocusing through a targeted selection of the wavelength of the laser radiation used for the demetallization.
  • the quantity D is also referred to as the resolving power, since two points can just about be separated from an optical system if their diffraction disks (or diffraction lines in the case of cylindrical lenses) overlap by half.
  • the diffraction-limited resolving power of the optical system of the microlenses 34 thus leads to a specific extension of the focus area, which is dependent on the laser wavelength, even when the incident laser radiation is optimally focused.
  • the present invention uses the wavelength-dependent size of the diffraction spot in a targeted manner in order to easily generate demetallizations of a desired line width in the focal plane and thus with maximum image sharpness.
  • the demetallized line width D real in practice does not always result in exactly the value for D calculated according to equation (1), but that the line width actually achieved also depends slightly on the laser power used. Specifically, that area of the focused laser beam in which the laser intensity exceeds the threshold required for the demetallization of the metallic motif layer is decisive for the demetallization. Since the laser intensity drops very sharply at the edge of the diffraction spot, only a small variation of the actual line width D real can be achieved by increasing or decreasing the laser intensity, but in practice it is suitable for fine tuning.
  • the wavelength dependence of the refractive index n of the lens material can also be used to achieve a further To achieve variation and in particular an increase in line width.
  • the refractive index n of the lens material which generally varies as a function of the wavelength, the focal length f of the microlenses used also varies depending on the wavelength of the incident radiation.
  • the demetallization takes place in such a way that the metallic motif layer lies essentially in the focal plane of the microlenses when the security element is viewed as desired in the visible spectral range.
  • an additional broadening of the lines can result from the fact that the focus length at 1064 nm is already deviates significantly from the focal length in the visible spectral range.
  • the conditions are therefore similar to those in the known method described above, in which the motif layer is arranged in a targeted manner outside the focal plane of the microlenses.
  • the motif layer is arranged in a targeted manner outside the focal plane of the microlenses.
  • the metallic motif layer 40 is illuminated through the microlenses 34 from three irradiation directions 30A, 30B, 30C in the form of the motifs 18A-18C Laser radiation applied to produce the desired demetallized portions 42 in the metallic layer 40 motif.
  • line widths of different sizes can also be used in a security element in a simple manner.
  • the 4 lenticular image 60 shown are provided with two target images which become visible when viewed obliquely from above (viewing direction 30A) or obliquely from below (viewing direction 30C).
  • a metallic motif layer 40 On the underside of the carrier are as in the embodiment of the 2 a metallic motif layer 40, a full-surface color layer 45, an opaque white layer 46 and a heat-sealing lacquer layer 48 are arranged.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laser Beam Processing (AREA)
  • Credit Cards Or The Like (AREA)

Claims (10)

  1. Procédé, destiné à fabriquer un élément de sécurité, pourvu d'une image à réseau lenticulaire, pour la reproduction d'une ou de plusieurs images de consigne, uniquement visibles à partir de directions d'observation prédéfinies, dont les motifs sont formés de zones partielles visuellement perceptibles, métalliques contrastées et démétallisées d'une couche de motif, lors du procédé
    - une image à réseau lenticulaire dotée d'une multiplicité de microlentilles (34) et d'une couche de motif (40) métallique, placée à distance du réseau lenticulaire étant mise à disposition,
    - l'effet réfringent des microlentilles (34) définissant un plan focal et la couche de motif (40) métallique étant placée majoritairement dans ledit plan focal,
    - une largeur de ligne pour les zones partielles (42) démétallisées qui doivent être créées étant sélectionnée dans la couche de motif (40) métallique,
    caractérisé en ce que
    - l'on sélectionne une source laser de marquage d'une longueur d'onde de laser λ, de telle sorte qu'à la longueur d'onde de laser λ, le pouvoir de résolution D(λ) des microlentilles de l'image à réseau lenticulaire corresponde sensiblement à la largeur de ligne des zones partielles (42) démétallisées qui doivent être créées, le pouvoir de résolution D(λ) des microlentilles de l'image à réseau lenticulaire étant déterminé par la relation D(λ) = 2,44*λ*f/ dML, f étant la longueur focale des microlentilles et dML étant le diamètre des microlentilles, et
    - l'on soumet la couche de motif (40) métallique à travers les microlentilles (34) au rayonnement laser de la source laser de marquage sélectionnée, pour créer des zones partielles (42) démétallisées dans la couche de motif métallique.
  2. Procédé selon la revendication 1, caractérisé en ce que l'image à réseau lenticulaire est conçue pour représenter n ≥ 2 images de consigne, et que l'on sélectionne pour les zones partielles démétallisées qui doivent être créées une largeur de ligne, qui se situe entre 0,6*dML/n et 1,4*dML/n, de préférence entre 0,8*dML/n et 1,2*dML/n, de manière particulièrement préférentielle, entre 0,9*dML/n et 1,1*dML/n, dML étant le diamètre des microlentilles.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on met à disposition une image à réseau lenticulaire dotée d'un réseau lenticulaire composé d'une multiplicité de microlentilles cylindriques.
  4. Procédé selon au moins l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on met à disposition une image à réseau lenticulaire, dont la couche de motif métallique est placée par rapport au plan focal avec un écart qui s'élève à moins de 25 %, de préférence à moins de 10% de la longueur focale des microlentilles.
  5. Procédé selon au moins l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on sélectionne la source laser de marquage de telle sorte que D diverge de moins de 15 %, de préférence de moins de 10 % de la largeur de ligne des zones partielles démétallisées qui doivent être créées.
  6. Procédé selon au moins l'une quelconque des revendications 1 à 5, caractérisé en ce que l'on utilise en tant que source laser de marquage un laser Nd : YAG, un laser Nd : YAG à fréquence doublée, un laser Nd : YAG à fréquence triplée ou un laser Er : verre.
  7. Procédé selon au moins l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on met en œuvre deux différentes sources laser de marquage ou plus, de différentes longueurs d'onde.
  8. Procédé selon au moins l'une quelconque des revendications 1 à 7, caractérisé en ce que pour le réglage fin, l'on règle la puissance laser de la source laser de marquage, pour adapter la largeur de ligne des zones partielles démétallisées créées à la largeur de ligne sélectionnée.
  9. Procédé selon au moins l'une quelconque des revendications 1 à 8, caractérisé en ce que l'on met à disposition une image à réseau lenticulaire dont le réseau lenticulaire comporte des microlentilles avec un diamètre de lentilles compris entre 5 µm et 20 µm et dont la période lenticulaire est comprise entre 100 % et 125 % du diamètre des lentilles.
  10. Procédé selon au moins l'une quelconque des revendications 1 à 9, caractérisé en ce que l'on met à disposition une image à réseau lenticulaire dont le réseau lenticulaire est enrobé d'une couche d'enrobage dont l'indice de réfraction diverge de préférence de 0,2 ou plus de l'indice de réfraction des microlentilles.
EP17822133.9A 2016-12-15 2017-12-15 Procédé permettant de fabriquer un élément de sécurité doté d'une image lenticulaire Active EP3554846B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016015015.7A DE102016015015A1 (de) 2016-12-15 2016-12-15 Verfahren zum Herstellen eines Sicherheitselements mit einem Linsenrasterbild
PCT/EP2017/001429 WO2018108318A1 (fr) 2016-12-15 2017-12-15 Procédé permettant de fabriquer un élément de sécurité doté d'une image lenticulaire

Publications (2)

Publication Number Publication Date
EP3554846A1 EP3554846A1 (fr) 2019-10-23
EP3554846B1 true EP3554846B1 (fr) 2022-03-23

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EP17822133.9A Active EP3554846B1 (fr) 2016-12-15 2017-12-15 Procédé permettant de fabriquer un élément de sécurité doté d'une image lenticulaire

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Country Link
US (1) US11040565B2 (fr)
EP (1) EP3554846B1 (fr)
AU (1) AU2017377115B2 (fr)
DE (1) DE102016015015A1 (fr)
WO (1) WO2018108318A1 (fr)

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KR102456159B1 (ko) * 2018-11-19 2022-10-18 한국조폐공사 위변조 방지용 보안제품
FR3103736B1 (fr) * 2019-11-29 2021-12-10 Idemia France Image personnalisée formée à partir d’un hologramme métallique
FR3116761B1 (fr) * 2020-11-30 2024-02-09 Idemia France Image personnalisée formée à partir d’une couche métallique et d’un réseau lenticulaire
EP4279291A1 (fr) * 2022-05-19 2023-11-22 MB Automation GmbH & Co. KG Dispositif de traitement de documents
FR3147515A1 (fr) * 2023-04-04 2024-10-11 Idemia France Document sécurisé et procédé de fabrication d’un document sécurisé

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Publication number Priority date Publication date Assignee Title
EP0219012B1 (fr) 1985-10-15 1993-01-20 GAO Gesellschaft für Automation und Organisation mbH Porteur d'informations pourvu d'une marque d'authenticité optique ainsi que procédé de réalisation et de contrôle du porteur d'informations
US20120091703A1 (en) * 2009-04-06 2012-04-19 Reserve Bank Of Australia Security document with an optically variable image and method of manufacture
NL2004481C2 (nl) * 2010-03-31 2011-10-04 Sagem Identification B V Werkwijze voor het vervaardigen van een driedimensionale afbeelding op basis van berekende beeldrotaties.
DE102010031713A1 (de) * 2010-07-21 2012-01-26 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement mit Kippbild
US8755121B2 (en) * 2011-01-28 2014-06-17 Crane & Co., Inc. Laser marked device
DE102013007484A1 (de) 2013-04-29 2014-10-30 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement
DE102014016009A1 (de) 2014-10-28 2016-04-28 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines Sicherheitselements mit einem Linsenrasterbild

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DE102016015015A1 (de) 2018-06-21
US11040565B2 (en) 2021-06-22
AU2017377115B2 (en) 2022-03-10
EP3554846A1 (fr) 2019-10-23
US20190315150A1 (en) 2019-10-17
WO2018108318A1 (fr) 2018-06-21
AU2017377115A1 (en) 2019-06-20

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