EP3554846A1 - 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

Info

Publication number
EP3554846A1
EP3554846A1 EP17822133.9A EP17822133A EP3554846A1 EP 3554846 A1 EP3554846 A1 EP 3554846A1 EP 17822133 A EP17822133 A EP 17822133A EP 3554846 A1 EP3554846 A1 EP 3554846A1
Authority
EP
European Patent Office
Prior art keywords
microlenses
laser
metallic
lenticular
motif layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17822133.9A
Other languages
German (de)
English (en)
Other versions
EP3554846B1 (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
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3554846A1 publication Critical patent/EP3554846A1/fr
Application granted granted Critical
Publication of EP3554846B1 publication Critical patent/EP3554846B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 image for displaying one or more target images which are visible only from predetermined viewing directions and whose motifs are formed by visually discernible, contrasting metallic and demetallized partial areas of a motif layer.
  • Data carriers such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements which give the viewer a different image impression at different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • a lenticular image contains a metallic motif layer
  • the motifs shown can be formed by local demetallization of the metallic active layer.
  • the demetallization can be effected, for example, by direct inscription by guiding a laser beam over the metallic motif layer by means of a suitable scanning device, or else by applying a laser to a larger area using a mask. In both cases, a particular challenge is the generation of demetallized lines of a desired width in the motif layer.
  • the metallic motif layer for demetallization is successively applied with a finely focused laser beam from different angles and thus at different points in the focal plane until the subareas having the desired line width are demetallized, then the entire area of the lenticular image is scanned usually very complicated and tedious.
  • the demetallization can be much faster in this case defocusing, however, produces blurry tilting images with no more clearly defined image changes.
  • the present invention seeks to provide a method of the type mentioned, which avoids the disadvantages of the prior art, and in particular allows a high production speed generation of sharply demarcated demetallized portions of adjustable line width in a lenticular image.
  • This object is solved by the features of the independent claim. Further developments of the invention are the subject of the dependent claims.
  • a lenticular image is provided with a lenticular of a plurality of microlenses and a metallic motif layer arranged at a distance from the lenticular grid, wherein the refractive effect of the microlenses defines a focal plane and the metallic motif layer substantially in this Focusing plane is arranged, a line width is selected for the demetallized subregions to be generated in the metallic motif layer, a marking laser source is selected with a laser wavelength ⁇ , so that the resolution D (A) of the microlenses of the lenticular image at the selected laser wavelength ⁇ in WE corresponds substantially to the line width of the demetallized portions to be generated, and the metallic motif layer is applied through the microlenses with laser radiation of the selected marking laser source to produce demetallierie portions in the metallic motif layer.
  • the lenticular image is designed to display n> 2 target images, and a line width is selected for the demetallized partial regions to be generated which are between 0.6 * dML / n and 1.4 ML / n, preferably between 0, 8 * dML / n and l, 2 * dML / n, more preferably between 0.9 * dML / n and l, l * dML / n, where diviL 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 lies below the resolution limit of the naked eye in at least one lateral direction.
  • the microlenses can in principle be of spherical or aspherical design, but the use of plano-convex cylindrical lenses is currently preferred, so that in the mentioned method a lenticular image with a lenticular grid of a plurality of plano-convex microcylindrical lenses is advantageously provided.
  • the term "diameter" always refers to the dimension perpendicular to the cylinder axis Zy.
  • the length of the micro-cylindrical lenses is arbitrary, it may for example correspond to the use of security threads of the total width of the thread and be several millimeters.
  • the metallic motif layer of the lenticular image is arranged according to the invention substantially in the focal plane of the microlenses, which means in particular that the distance of the metallic motif layer from the focal plane less than 25%, preferably less than 10% and more preferably less than 5% of the focal length of the microlenses is.
  • the marking laser source is then advantageously selected so that the resolution D (A) deviates from the line width of the demetallized portions to be generated by less than 15%, preferably by less than 10%.
  • the resolution D (A) deviates from the line width of the demetallized portions to be generated by less than 15%, preferably by less than 10%.
  • Laser source used such as a 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, as long as they are only suitable for demetallizing the metallic motif layer. If two or more different laser sources of different wavelengths are used, differently sized line widths can be realized in a simple way in a security element.
  • the laser power of the marking laser source is adjusted in order to adapt the line width of the generated demetallelleen portions to the selected line width. It is advantageous to provide a lenticular image whose lenticular grid 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 lenticular grid can be adjacent to air, but in particular it can also be embedded in an embedding layer whose refractive index preferably differs by 0.2 or more from the refractive index of the microlenses.
  • FIG. 1 is a schematic representation of a banknote with a security element according to the invention in the form of a window security thread, which contains a tilted image with three different target images,
  • FIG. 2 shows schematically the structure of the window security thread of FIG. 1 in cross section
  • FIG. 3 is a schematic diagram of a lenticular image for explaining the principle used according to the invention, and schematically the structure of a window security thread according to another embodiment of the invention in cross section.
  • the invention will now be explained using the example of security elements for banknotes and other value documents.
  • 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 it is embedded in the intermediate web areas 16 in the interior of the banknote 10.
  • the security thread 12 shows a tilted image, which in each case presents the observer with a different desired 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 windowed security thread 12 of the embodiment obliquely viewed from above 30A shows a sequence of Euro symbols 22A against a metallic shiny background 20, while when viewed perpendicularly 30B a sequence of crest motifs 22B against metallic shiny background 20 and obliquely 30C from below one Sequence of numerical motifs 22C in the form of the denomination "10" in front of metallic shiny background 20 is visible.
  • the appearance of the window security thread 12 in the window regions 14 alternates between the three reference images 18A, 18B, 18C depending on the viewing direction.
  • Figure 2 shows schematically 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, which has in the grid of the cylindrical lenses 34 spaced, demetallisier- te partial areas 42.
  • Motif layer 40 are matched to one another such that the motif layer 40 is located in the focal plane of the cylindrical lenses 34.
  • FIG. 2 shows a detail of the lenticular image in which the motif layer 40 contains demetallized subregions 42 only in the regions 44B which are visible when viewed perpendicularly 30B.
  • the regions 44A and 44C which are visible obliquely from above (viewing direction 30A) or obliquely from below (viewing direction 30C) have no demetallizations in the section shown, so that the viewer in each case looks at metal regions of the motif layer 40 from these directions.
  • the individual demetallized portions 42 represent narrow strips arranged in the grid of the cylindrical lenses, they settle when viewed from the different viewing directions due to the fo kussierenden effect of the cylindrical lenses 34 to the desired sequence of motives 18A - 18C together.
  • the window security thread 12 typically includes additional layers, such as a full-area color layer 45 that permits coloring of the demetallized motif portions 22A-22C, an opaque white layer 46, and a heat seal lacquer layer 48.
  • additional layers such as a full-area color layer 45 that permits coloring of the demetallized motif portions 22A-22C, an opaque white layer 46, and a heat seal lacquer layer 48.
  • these or other functional layers are well-known to those skilled in the art However, the present invention is not essential and will therefore not be described in detail.
  • the line width D rea i of the demetallhyroiden portions 42 is substantially one third of the diameter dML of the microlenses 34.
  • the advantageous linewidth of the demetallized portions in a lenticular image for displaying two target images is substantially half the microlens diameter, and generally one
  • the active layer 40 is conventionally scanned with a finely focussed laser beam at different angles until partial regions 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 in Laserdemetallisation in the plane of the motif layer results in a widened and thus wider image of the incident laser radiation.
  • both variants have disadvantages in terms of the process duration or the quality of the generated target images, as already explained above.
  • the solution according to the invention uses the wavelength-dependent resolution capability of the optical system formed by the microlenses, in order to obtain a desired line width by targeted selection of the wavelength of the laser radiation used for demetalization without defocusing.
  • D () 2.44 * A * f / d M L (1)
  • ⁇ represents the wavelength of light
  • dML the diameter of the microlenses
  • f the focal length of the microlenses.
  • the size D is also referred to as resolving power, since two points are barely separable from an optical system if their diffraction slices (or diffraction lines in cylindrical lenses) cover one another in half.
  • the diffraction-limited resolving power of the optical system of the microlenses 34 thus leads, even with optimum focusing of the incident laser radiation, to a specific extent of the focal region which is dependent on the laser wavelength.
  • the present invention specifically uses the wavelength-dependent size of the diffraction spot in order to easily produce demetallisations of a desired linewidth in the focal plane and thus with maximum image sharpness.
  • the metallic surface layer 40 of the lenticular image which is still full-surface first, is to be provided with demetallized partial regions in order to generate the target images 18A-18C. Since three image areas 44A-44C are to lie under each microlens 34, the target line width for the demetallized subareas 42
  • D rei the demetallised line width
  • the actually achieved line width additionally depends slightly on the laser power used.
  • the area of the focused laser beam in which the laser intensity corresponds to that for the demetallization is decisive for the demetallization
  • Demetallization of the metallic motif layer exceeds required threshold. Since the laser intensity drops very sharply at the edge of the diffraction spot, only a small variation of the actual line width D re ai, which is suitable for fine tuning in practice, can be achieved by increasing or decreasing the laser intensity.
  • the wavelength dependence of the refractive index n of the lens material can also be used to produce another To achieve variation and in particular an increase in the 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, given a desired viewing of the security element in the visible spectral range, the metallic motif layer lies substantially in the focal plane of the microlenses.
  • the metallic motif layer is exposed to laser radiation, conditions are similar to those in the known method described above, in which the motif layer is arranged specifically outside the focal plane of the microlenses. Unlike in this known method, however, an arrangement "outside the focal plane" in the present invention is present only at the wavelength used for demetallization.
  • the metallic motif layer 40 is conveyed through the microlenses 34 from three irradiation directions 30A, 30B, 30C in the form of the motifs 18A-18C Laser radiation is applied to produce the desired demetallillone portions 42 in the metallic motif layer 40. If demetallizations with other line widths in the metallic motif layer 40 are to be produced in the lenticular image of FIG.
  • different line widths can also be used in a simple manner in a security element.
  • the lenticular image 60 shown in FIG. 4 is to be provided with two target images which are visible obliquely when viewed from above (viewing direction 30A) or obliquely from below (viewing direction 30C).
  • 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 on the underside of the support. Since two image areas are to be accommodated under each microlens, the target line width for the demetallized subregions 42 to be generated in the present exemplary embodiment is

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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)

Abstract

L'invention concerne un procédé permettant de fabriquer un élément de sécurité doté d'une image lenticulaire servant à représenter une ou plusieurs images cibles seulement visibles à partir de directions d'observation prédéfinies, images cibles dont les motifs sont formés par des parties métalliques et des parties démétallisées contrastées reconnaissables visuellement d'une couche à motifs. Selon le procédé, - une image lenticulaire comprenant un réseau lenticulaire constitué d'une pluralité de microlentilles (34) et d'une couche à motifs (40) métallique disposée à distance du réseau lenticulaire est produite, - l'effet réfractif des microlentilles (34) définissant un plan focal et la couche à motifs (40) métallique étant disposée sensiblement dans ce plan focal, - une largeur de ligne pour les parties (42) démétallisées à produire dans la couche à motifs (40) métallique est sélectionnée, - une source laser de marquage présentant une longueur d'onde de laser λ est sélectionnée de telle sorte que la résolution D(λ) des microlentilles de l'image lenticulaire à la longueur d'onde de laser λ sélectionnée corresponde sensiblement à la largeur de ligne des parties (42) démétallisées à produire, et - la couche à motifs (40) métallique est exposée au rayonnement laser de la source laser de marquage à travers les microlentilles (34), afin de produire des parties (42) démétallisées dans la couche à motifs métallique.
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 true EP3554846A1 (fr) 2019-10-23
EP3554846B1 EP3554846B1 (fr) 2022-03-23

Family

ID=60857000

Family Applications (1)

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

Country Status (5)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (7)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
DE102016015015A1 (de) 2018-06-21
US11040565B2 (en) 2021-06-22
EP3554846B1 (fr) 2022-03-23
AU2017377115B2 (en) 2022-03-10
US20190315150A1 (en) 2019-10-17
WO2018108318A1 (fr) 2018-06-21
AU2017377115A1 (en) 2019-06-20

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