EP2391512B1 - Optically variable security element - Google Patents

Optically variable security element Download PDF

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Publication number
EP2391512B1
EP2391512B1 EP10703800.2A EP10703800A EP2391512B1 EP 2391512 B1 EP2391512 B1 EP 2391512B1 EP 10703800 A EP10703800 A EP 10703800A EP 2391512 B1 EP2391512 B1 EP 2391512B1
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EP
European Patent Office
Prior art keywords
optically variable
security element
recording layer
markings
card
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EP10703800.2A
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German (de)
French (fr)
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EP2391512A1 (en
Inventor
Andreas Minks
Günter Endres
Harald Reiner
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Giesecke and Devrient ePayments GmbH
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Giesecke and Devrient GmbH
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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
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/324—Reliefs
    • 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
    • B42D25/328—Diffraction gratings; Holograms
    • 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
    • B42D25/425—Marking by deformation, e.g. embossing
    • B42D2033/04—
    • B42D2033/20—
    • B42D2033/24—
    • B42D2033/26—
    • B42D2035/20—
    • B42D2035/26—

Definitions

  • the invention relates to an optically variable security element for securing data carriers, in which by the action of laser radiation visually recognizable identifications in the form of patterns, characters or a coding are introduced.
  • the invention also relates to a method for producing such a security element and to a data carrier equipped with such a security element.
  • Data carriers such as identification cards, credit cards, bank cards and the like are increasingly being used in various service sectors, but also in the in-house area. They usually have to meet two opposing conditions. Because of their widespread use, they are a mass-produced product that should be simple and inexpensive to produce. On the other hand, they should offer the greatest possible security against counterfeiting or falsification due to their legitimacy function.
  • the ISO 7810 standard specifies the physical characteristics of identification cards for three different sizes of cards, designated ID-1, ID-2 and ID-3.
  • ID-1 the physical characteristics of identification cards for three different sizes of cards, designated ID-1, ID-2 and ID-3.
  • the widest distribution has found the ID-1 card with dimensions of 85.60 mm x 53.98 mm, which is used for example in bank and credit cards, phone cards or the EU driving license.
  • WO 2006/102700 discloses an optically variable security element according to the preamble of claim 1.
  • the present invention seeks to provide a security element of the type mentioned above with attractive visual appearance and high security against counterfeiting.
  • a generic security element contains an optically variable recording layer, which is at least partially provided with a surface relief in the form of a lenticular grid.
  • at least first and second markings are introduced with laser radiation from different directions through the lens grid into the optically variable recording layer and can be seen when viewing each from the same directions.
  • the combination of a lens grid with an optically variable recording layer produces an optically multivariable security element in which the first tilting effect of a laser tilting image and the second tilting effect of an optically variable feature interact with one another and visually enhance each other.
  • the proposed security element thus combines high security against counterfeiting with an appealing visual appearance and a high attention and recognition value.
  • the optically variable recording layer is a color layer with optically variable pigments, in particular with interference layer pigments or liquid crystal pigments.
  • the optically variable recording layer can also be advantageously formed by a diffractive diffraction structure, such as a hologram or a hologram-like diffraction structure, or an achromatic matt structure.
  • the optically variable recording layer can additionally be provided with a relief structure.
  • the markings introduced by the load radiation advantageously represent non-blackened portions of the optically variable recording layer, which are visually recognizable due to their optical properties changed by the laser radiation.
  • the lens grid comprises cylindrical lenses and / or spherical lenses.
  • the axis of the cylindrical lenses can thereby straight or curved, parallel or at a certain angle to the outer edges of the data carrier.
  • the lenticular grid is in the form of a horizontal or a vertical lenticular grid.
  • the optically variable recording layer is expediently separated from the lenticular screen by a transparent spacer layer. It can be arranged on or near the surface, or even inside the security element.
  • the introduced markings can basically represent any data.
  • the markings represent personal data such as a signature, a date of birth, a portrait or the like, but may also or additionally contain data carrier related data such as a period of validity, a card number, information on the issuing authority or institution or the like.
  • Rasterized markings are particularly suitable for laser marking.
  • the individual raster elements can be generated in a controlled manner by pulsed irradiation of the recording layer, for example with an Nd: YAG laser, a Nd: glass laser or else a longer wavelength CO 2 laser.
  • the markings are introduced through the lens grid into the underlying optically variable recording layer.
  • the laser beam is held at different, predetermined angles to the plane of the lenticular grid, so that upon passage of the laser radiation through the lenses different locations of the recording layer are modified, but not blackened according to the intention of the invention.
  • the markings introduced in this way and visible through the locally altered optical properties of the recording layer are each essentially only at that angle recognizable under which they were introduced.
  • the size of the angle range under which an identification is recognizable depends on the size of the modified area, and can be adjusted, for example, via the pulse energy of the laser beam.
  • the data carrier can be provided with two or more different markings that can not be reproduced photographically or with copiers, since at a certain viewing angle, the entire information written is never recognizable.
  • the markings which can be recognized from different directions are expediently nested in one another in the recording layer.
  • the separation of the information content takes place when viewing the data carrier from the recording directions corresponding viewing directions, since the lens raster shows the viewer only the part of the markings associated with the viewing direction. This makes a technical reproduction of the written information practically impossible, since an exact alignment with a later applied lenticular does not succeed with the required accuracy.
  • the lenticular grid is preferably produced by lamination or embossing, optionally via a transparent intermediate layer, over the optically variable recording layer.
  • the invention also includes a data carrier, in particular a brand article, a document of value, an identity card and the like, with a security element of the type mentioned.
  • a data carrier in particular a brand article, a document of value, an identity card and the like, with a security element of the type mentioned.
  • the invention offers particular advantages in the case of data carriers in the form of cards such as credit cards, bank cards, cash cards, authorization cards, identity cards or passport personalization pages ,
  • FIG. 1 shows a schematic representation of an identification card 10 in ID-1 format, as used for example for bank cards, credit cards or driver's licenses.
  • the card 10 for securing a laser tipping image 14 which contains two different, inscribed by laser radiation markings 16 and 18, in Fig.1 are schematically represented by the letters "AAA" and "BBB". Unlike in the graphic representation of Fig.1 the markings 16,18 when viewing the card 10 not simultaneously, but only by tilting the card 10 in a different tilt angle recognizable.
  • the laser tipping image 14 is formed in the embodiment in the form of a horizontal lens grid, but may be formed in other embodiments, for example, in the form of a vertical lenticular grid.
  • cards in the ID-1 format are often designed with both a laser tipping image and an optically variable effect color print, such as a color layer with optically variable pigments or a hologram. Since the effect color printing requires a certain minimum surface area in order to be able to develop its visual effect, the result of known designs is often unsatisfactory due to the necessary compromises.
  • the laser tilting image 14 and the optically variable feature are arranged in the same surface area as with reference to the cross-sectional representation of FIG Fig. 2 explained in more detail, which shows a sectional view of the card 10 along the line II-II.
  • the card 10 contains a card body 20, which is provided in the region of the laser tilting image 14 with an optically variable recording layer 22 and a spacer layer 24 transparent over the recording layer 22.
  • the optically variable recording layer 22 is in the exemplary embodiment a color layer with optically variable pigments, in particular with interference layer pigments or with liquid crystal pigments.
  • the optically variable recording layer may be formed, for example, by a diffractive diffraction structure, such as a hologram or a hologram-like diffraction structure, or a matte structure.
  • the card body itself may be formed of a transparent, semi-transparent or translucent material.
  • the surface of the card 10 in the region of the laser tilting image 14 is provided with a surface relief in the form of a lenticular grid 26, which in the exemplary embodiment consists of a plurality of horizontal, parallel cylindrical lenses.
  • the markings 16 introduced into the laser tipping image, 18 were written into the optically variable recording layer 22 only after the application of the lens grid 26 by means of a pulsed infrared laser.
  • a laser beam from different directions 30 and 32 is directed to the lens grid 26.
  • the individual cylindrical lenses focus the laser beam on different small subregions 40 and 42 of the optically variable recording layer 22.
  • Wavelength, intensity and pulse duration of the laser radiation are matched to the properties of the recording layer 22 such that the subregions 40, 42 are not blackened, but visually recognizable because of their laser radiation by the locally changed optical properties against the background of the non-impacted areas.
  • the sections 40 together form the marking 16 of Fig. 1 , the subregions 42, the markings 18.
  • the appearance of the markings 16,18 within the optically variable recording layer 22 is visibly more attractive visually than the usual blackened areas of a white card body.
  • the sub-regions 40 inscribed in this direction can be seen because of the focusing effect of the cylindrical lenses, which form an image for the observer 50, in the exemplary embodiment the letter "AAA" of the marking 16.
  • the partial regions 42 inscribed in this direction can be recognized from the viewing direction 32 and, for the observer 50, form an image of the letters "BBB" of the marking 18.
  • the cylindrical lenses each show only portions of the optically variable recording layer that are not modified by laser radiation 22, which contain no markings.
  • the blackening can also be seen from the underside of the card, ie the side facing away from the lenses.
  • the laser tilting image 14 of the card 10 thus has an optically double-variable appearance when viewed.
  • the first optically variable effect is given by the tilting effect of the laser tilting image 14: If the card is tilted from the viewing direction 34 over the viewing directions 30 and 32 towards the viewing direction 36, the viewer first sees the recording layer 22 without marking (viewing direction 34). From the viewing direction 30, the first marking 16 is visible, then from the viewing direction 32 the second marking 18, until from the viewing direction 36 again only the recording layer 22 without markings can be recognized.
  • the second optically variable effect is generated by the optical variability of the recording layer 22 and depends on the type of the selected recording layer 22.
  • the second optically variable effect may, for example, be a viewing-angle-dependent color-shift effect, which conveys to the viewer a color impression that changes with the viewing direction. Viewing angle dependent diffraction effects, scattering effects or refractive effects are also possible.
  • the refraction of the cylindrical lenses of the lens grid 26 further modifies the second optically variable effect of the recording layer 22 compared to a separately present recording layer.
  • the optically variable recording layer 22 may additionally have a relief structure, for example an embossed structure be provided.
  • a relief structure for example an embossed structure be provided.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Holo Graphy (AREA)

Description

Die Erfindung betrifft ein optisch variables Sicherheitselement zur Absicherung von Datenträgern, in das durch Einwirkung von Laserstrahlung visuell erkennbare Kennzeichnungen in Form von Mustern, Zeichen oder einer Kodierung eingebracht sind. Die Erfindung betrifft auch ein Verfahren zum Herstellen eines solchen Sicherheitselements und einen mit einem derartigen Sicherheitselement ausgestatteten Datenträger.The invention relates to an optically variable security element for securing data carriers, in which by the action of laser radiation visually recognizable identifications in the form of patterns, characters or a coding are introduced. The invention also relates to a method for producing such a security element and to a data carrier equipped with such a security element.

Datenträger, wie beispielsweise Ausweiskarten, Kreditkarten, Bankkarten und dergleichen werden in steigendem Maß in verschiedenen Dienstleistungssektoren, aber auch im innerbetrieblichen Bereich eingesetzt. Sie müssen dabei in der Regel zwei gegenläufige Bedingungen erfüllen. So stellen sie wegen ihrer großen Verbreitung zum einen ein Massenprodukt dar, das einfach und kostengünstig herzustellen sein soll. Zum anderen sollen sie aufgrund ihrer Legitimationsfunktion größtmögliche Sicherheit gegen Fälschung oder Verfälschung bieten. Die Vielzahl der erhältlichen Arten von Karten, insbesondere von Magnetstreifenkarten und Chipkarten, ist Zeugnis für die zahlreichen Bemühungen und die verschiedenartigen Vorschläge, wie diese gegenläufigen Anforderungen in geeigneter Weise miteinander verbunden werden können.Data carriers such as identification cards, credit cards, bank cards and the like are increasingly being used in various service sectors, but also in the in-house area. They usually have to meet two opposing conditions. Because of their widespread use, they are a mass-produced product that should be simple and inexpensive to produce. On the other hand, they should offer the greatest possible security against counterfeiting or falsification due to their legitimacy function. The variety of available types of cards, particularly magnetic stripe cards and smart cards, is testimony to the numerous efforts and various suggestions as to how these conflicting requirements can be properly combined.

Die Norm ISO 7810 spezifiziert die physikalischen Eigenschaften von Identifikationskarten für drei verschiedene Größen von Karten, die mit ID-1, ID-2 und ID-3 bezeichnet werden. Die weiteste Verbreitung hat dabei die ID-1-Karte mit Abmessungen von 85,60 mm x 53,98 mm gefunden, die beispielsweise bei Bank- und Kreditkarten, bei Telefonkarten oder dem EU-Führerschein eingesetzt wird.The ISO 7810 standard specifies the physical characteristics of identification cards for three different sizes of cards, designated ID-1, ID-2 and ID-3. The widest distribution has found the ID-1 card with dimensions of 85.60 mm x 53.98 mm, which is used for example in bank and credit cards, phone cards or the EU driving license.

Zur Absicherung werden Datenträger im ID-Kartenformat und anderen Formaten oft mit lasergravierten Kippbildern versehen. Dabei werden zwei oder mehr verschiedene Kennzeichnungen, beispielsweise eine Seriennummer und ein Ablaufdatum, unter unterschiedlichen Winkeln durch eine Anordnung zylindrischer Linsen in die Karte lasergraviert. Die Laserstrahlung erzeugt dabei eine lokale Schwärzung des Kartenkörpers, die die eingravierten Kennzeichnungen visuell sichtbar macht. Bei der Betrachtung ist je nach Blickwinkel nur die jeweils aus dieser Richtung eingravierte Kennzeichnung sichtbar, so dass durch eine Verkippung der Karte senkrecht zur Achse der Zylinderlinsen ein optisch variabler Kippeffekt entsteht.To protect data carriers in ID card format and other formats are often provided with laser-engraved tilting images. In this case, two or more different markings, such as a serial number and an expiration date, are laser engraved at different angles by an array of cylindrical lenses in the card. The laser radiation generates a local blackening of the card body, which makes the engraved markings visually visible. When looking at it, depending on the viewing angle, only the marking engraved from this direction is visible, so that an optically variable tilting effect is produced by tilting the card perpendicular to the axis of the cylindrical lenses.

Das Dokument WO 2006/102700 offenbart ein optisch variables Sicherheitselement nach dem Oberbegriff des Anspruchs 1.The document WO 2006/102700 discloses an optically variable security element according to the preamble of claim 1.

Davon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein Sicherheitselement der eingangs genannten Art mit attraktivem visuellem Erscheinungsbild und hoher Fälschungssicherheit zu schaffen.Based on this, the present invention seeks to provide a security element of the type mentioned above with attractive visual appearance and high security against counterfeiting.

Diese Aufgabe wird durch das Sicherheitselement mit den Merkmalen des Hauptanspruchs gelöst. Ein Verfahren zum Herstellen eines derartigen Sicherheitselements und ein Datenträger mit einem solchen Sicherheitselement sind in den nebengeordneten Ansprüchen angegeben. Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the security element having the features of the main claim. A method for producing such a security element and a data carrier with such a security element are specified in the independent claims. Further developments of the invention are the subject of the dependent claims.

Gemäß der Erfindung enthält ein gattungsgemäßes Sicherheitselement eine optisch variable Aufzeichnungsschicht, die zumindest teilweise mit einem Oberflächenrelief in Form eines Linsenrasters versehen ist. Dabei sind zumindest erste und zweite Kennzeichnungen mit Laserstrahlung aus unterschiedlichen Richtungen durch das Linsenraster hindurch in die optisch variable Aufzeichnungsschicht eingebracht und bei der Betrachtung jeweils aus denselben Richtungen erkennbar.According to the invention, a generic security element contains an optically variable recording layer, which is at least partially provided with a surface relief in the form of a lenticular grid. In this case, at least first and second markings are introduced with laser radiation from different directions through the lens grid into the optically variable recording layer and can be seen when viewing each from the same directions.

Wie nachfolgend genauer erläutert, entsteht durch die Kombination eines Linsenrasters mit einer optisch variablen Aufzeichnungsschicht ein optisch multivariables Sicherheitselement, bei dem der erste Kippeffekt eines Laserkippbilds und der zweite Kippeffekt eines optisch variablen Merkmals miteinander wechselwirken und einander gegenseitig visuell aufwerten. Das vorgeschlagene Sicherheitselement verbindet so eine hohe Fälschungssicherheit mit einem ansprechenden visuellen Erscheinungsbild und einem hohem Aufmerksamkeits- und Wiedererkennungswert.As explained in more detail below, the combination of a lens grid with an optically variable recording layer produces an optically multivariable security element in which the first tilting effect of a laser tilting image and the second tilting effect of an optically variable feature interact with one another and visually enhance each other. The proposed security element thus combines high security against counterfeiting with an appealing visual appearance and a high attention and recognition value.

In einer vorteilhaften Ausgestaltung ist die optisch variable Aufzeichnungsschicht eine Farbschicht mit optisch variablen Pigmenten, insbesondere mit Interferenzschichtpigmenten oder Flüssigkristallpigmenten. Die optisch variable Aufzeichnungsschicht kann mit Vorteil auch durch eine diffraktive Beugungsstruktur, wie etwa ein Hologramm oder eine hologrammähnliche Beugungsstruktur, oder eine achromatische Mattstruktur gebildet sein.In an advantageous embodiment, the optically variable recording layer is a color layer with optically variable pigments, in particular with interference layer pigments or liquid crystal pigments. The optically variable recording layer can also be advantageously formed by a diffractive diffraction structure, such as a hologram or a hologram-like diffraction structure, or an achromatic matt structure.

Zur weiteren Erhöhung der Sicherheit und zur Erzielung reizvoller visueller Effekte kann die optisch variable Aufzeichnungsschicht zusätzlich mit einer Reliefstruktur versehen sein.To further increase the security and to achieve attractive visual effects, the optically variable recording layer can additionally be provided with a relief structure.

Die durch die Lasterstrahlung eingebrachten Kennzeichnungen stellen mit Vorteil nicht-geschwärzte Teilbereiche der optisch variablen Aufzeichnungsschicht dar, die aufgrund ihrer durch die Laserstrahlung veränderten optischen Eigenschaften visuell erkennbar sind.The markings introduced by the load radiation advantageously represent non-blackened portions of the optically variable recording layer, which are visually recognizable due to their optical properties changed by the laser radiation.

In einer vorteilhaften Ausgestaltung der Erfindung umfasst das Linsenraster Zylinderlinsen und/ oder sphärische Linsen. Je nach konkretem Anwendungsfall kann die Achse der Zylinderlinsen dabei geradlinig oder geschwungen, parallel oder in einem bestimmten Winkel zu den äußeren Kanten des Datenträgers verlaufen. In den gebräuchlichsten Varianten ist das Linsenraster in Form eines horizontalen oder eines vertikalen Linsenrasters ausgebildet.In an advantageous embodiment of the invention, the lens grid comprises cylindrical lenses and / or spherical lenses. Depending on the specific application, the axis of the cylindrical lenses can thereby straight or curved, parallel or at a certain angle to the outer edges of the data carrier. In the most common variants, the lenticular grid is in the form of a horizontal or a vertical lenticular grid.

Die optisch variable Aufzeichnungsschicht ist zweckmäßig durch eine transparente Abstandsschicht von dem Linsenraster getrennt. Sie kann an oder nahe der Oberfläche, oder auch im Inneren des Sicherheitselements angeordnet sein.The optically variable recording layer is expediently separated from the lenticular screen by a transparent spacer layer. It can be arranged on or near the surface, or even inside the security element.

Die eingebrachten Kennzeichnungen können grundsätzlich beliebige Daten darstellen. Typischerweise stellen die Kennzeichnungen personenbezogene Daten wie eine Unterschrift, ein Geburtsdatum, ein Portrait oder dergleichen dar, können aber auch oder zusätzlich datenträgerbezogene Daten wie eine Gültigkeitsdauer, eine Kartennummer, Angaben zur ausstellenden Behörde oder Institut oder dergleichen enthalten. Besonders geeignet für die Laserbeschriftung sind gerasterte Kennzeichnungen. Die einzelnen Rasterelemente können kontrolliert durch gepulste Bestrahlung der Aufzeichnungsschicht, beispielsweise mit einem Nd:YAG-Laser, einem Nd:Glas-Laser oder auch einem längerwelligen CO2-Laser erzeugt werden.The introduced markings can basically represent any data. Typically, the markings represent personal data such as a signature, a date of birth, a portrait or the like, but may also or additionally contain data carrier related data such as a period of validity, a card number, information on the issuing authority or institution or the like. Rasterized markings are particularly suitable for laser marking. The individual raster elements can be generated in a controlled manner by pulsed irradiation of the recording layer, for example with an Nd: YAG laser, a Nd: glass laser or else a longer wavelength CO 2 laser.

Bei der Laserbeschriftung werden die Kennzeichnungen durch das Linsenraster hindurch in die darunter liegende optisch variable Aufzeichnungsschicht eingebracht. Dabei wird der Laserstrahl in verschiedenen, vorbestimmten Winkeln zur Ebene des Linsenrasters gehalten, so dass bei Durchgang der Laserstrahlung durch die Linsen verschiedene Stellen der Aufzeichnungsschicht modifiziert, entsprechend der Intention der Erfindung jedoch nicht geschwärzt werden. Die so eingebrachten und durch die lokal veränderten optischen Eigenschaften der Aufzeichnungsschicht sichtbaren Kennzeichnungen sind jeweils im Wesentlichen nur aus demjenigen Winkel erkennbar, unter dem sie eingebracht wurden. Die Größe des Winkelbereichs, unter dem eine Kennzeichnung erkennbar ist, hängt von der Größe des modifizierten Bereichs ab, und kann beispielsweise über die Pulsenergie des Laserstrahls eingestellt werden. Somit kann der Datenträger mit zwei oder mehreren verschiedenen Kennzeichnungen versehen werden, die sich photographisch oder mit Kopiergeräten nicht reproduzieren lassen, da unter einem bestimmten Betrachtungswinkel niemals die gesamte eingeschriebene Information erkennbar ist.In laser marking, the markings are introduced through the lens grid into the underlying optically variable recording layer. In this case, the laser beam is held at different, predetermined angles to the plane of the lenticular grid, so that upon passage of the laser radiation through the lenses different locations of the recording layer are modified, but not blackened according to the intention of the invention. The markings introduced in this way and visible through the locally altered optical properties of the recording layer are each essentially only at that angle recognizable under which they were introduced. The size of the angle range under which an identification is recognizable depends on the size of the modified area, and can be adjusted, for example, via the pulse energy of the laser beam. Thus, the data carrier can be provided with two or more different markings that can not be reproduced photographically or with copiers, since at a certain viewing angle, the entire information written is never recognizable.

Die aus unterschiedlichen Richtungen erkennbaren Kennzeichnungen liegen in der Aufzeichnungsschicht zweckmäßig ineinander verschachtelt vor. Die Trennung des Informationsgehalts erfolgt beim Betrachten des Datenträgers aus den Aufzeichnungsrichtungen entsprechenden Betrachtungsrichtungen, da das Linsenraster dem Betrachter jeweils nur den der Betrachtungsrichtung zugeordneten Teil der Kennzeichnungen zeigt. Dies macht eine drucktechnische Reproduktion der eingeschriebenen Information praktisch unmöglich, da eine genaue Ausrichtung auf ein später aufgebrachtes Linsenraster nicht mit der erforderlichen Genauigkeit gelingt.The markings which can be recognized from different directions are expediently nested in one another in the recording layer. The separation of the information content takes place when viewing the data carrier from the recording directions corresponding viewing directions, since the lens raster shows the viewer only the part of the markings associated with the viewing direction. This makes a technical reproduction of the written information practically impossible, since an exact alignment with a later applied lenticular does not succeed with the required accuracy.

Die Erfindung enthält auch ein Verfahren zum Herstellen eines optisch variables Sicherheitselementes zur Absicherung von Datenträgern bei dem durch Einwirkung von Laserstrahlung visuell erkennbare Kennzeichnungen in Form von Mustern, Zeichen oder einer Kodierung eingebracht werden, indem

  • eine optisch variable Aufzeichnungsschicht zumindest teilweise mit einem Oberflächenrelief in Form eines Linsenrasters versehen wird, und
  • zumindest erste und zweite Kennzeichnungen mit Laserstrahlung aus unterschiedlichen Richtungen durch das Linsenraster hindurch in die optisch variable Aufzeichnungsschicht eingebracht werden, die bei der späteren Betrachtung des Sicherheitselements jeweils aus denselben Richtungen erkennbar sind.
The invention also includes a method for producing an optically variable security element for securing data carriers, in which markings which can be visually recognized by the action of laser radiation are introduced in the form of patterns, characters or a code by
  • an optically variable recording layer is at least partially provided with a surface relief in the form of a lenticular grid, and
  • at least first and second markings are introduced with laser radiation from different directions through the lens grid in the optically variable recording layer, which are recognizable from the same directions in the subsequent consideration of the security element.

Das Linsenraster wird dabei bevorzugt durch Laminieren oder Prägen, gegebenenfalls über eine transparente Zwischenschicht, über der optisch variablen Aufzeichnungsschicht erzeugt.The lenticular grid is preferably produced by lamination or embossing, optionally via a transparent intermediate layer, over the optically variable recording layer.

Die Erfindung umfasst auch einen Datenträger, insbesondere einen Markenartikel, ein Wertdokument, eine Ausweiskarte und dergleichen, mit einem Sicherheitselement der genannten Art. Besondere Vorteile bietet die Erfindung bei Datenträgern in Form von Karten, wie Kreditkarten, Bankkarten, Barzahlungskarten, Berechtigungskarten, Personalausweisen oder Passpersonalisierungsseiten.The invention also includes a data carrier, in particular a brand article, a document of value, an identity card and the like, with a security element of the type mentioned. The invention offers particular advantages in the case of data carriers in the form of cards such as credit cards, bank cards, cash cards, authorization cards, identity cards or passport personalization pages ,

Insgesamt bietet die vorgeschlagene Kombination einer optisch variablen Aufzeichnungsschicht mit einem Laserkippbild in einem Sicherheitselement insbesondere die folgenden Vorteile:

  • Die Kombination beider Effekte erlaubt die Erzeugung optisch multivariabler Sicherheitselemente mit nicht-schwarz/weißer Laserbeschriftung. Die lasergravierten Kennzeichnungen können vielmehr farbig, insbesondere mit einem metallisch glänzenden und/ oder einem changierenden visuellen Erscheinungsbild gestaltet werden.
  • Der Kippeffekt der optisch variablen Aufzeichnungsschicht wird durch das Linsenraster des Laserkippbild zusätzlich modifiziert. Weitere Kombinations- und Variationsmöglichkeiten und neuartige visuelle Effekte ergeben sich, wenn die Aufzeichnungsschicht zusätzlich mit einer Reliefstruktur versehen ist.
  • Die Fälschungssicherheit bekannter Laserkippbilder wird durch die Kombination mit dem optisch variablen Merkmal erhöht. Umgekehrt erhöht sich auch die Fälschungssicherheit des optisch variablen Merkmals durch die Verbindung mit dem Linsenraster, so dass sich beide Teilmerkmale gegenseitig aufwerten. Da der optisch variable Effekt der Aufzeichnungsschicht durch das Linsenraster modifiziert wird, ist die Fälschungssicherheit des Gesamtmerkmals höher als die zweier getrennt vorliegender Einzelmerkmale.
  • Neben der Fälschungssicherheit erhöht sich durch die vorgeschlagene Kombination auch der Aufmerksamkeits- und Wiedererkennungswert des Sicherheitselements. Das visuelle Erscheinungsbild wird aufgewertet und die Erkennbarkeit des Gesamtelements als Echtheitsmerkmal gerade bei schlechten Beleuchtungsverhältnissen erhöht.
  • Das kombinierte Sicherheitselement benötigt auf der Karte nicht mehr Platz als ein Laserkippbild allein und kann daher auch auf Karten mit kleiner zur Verfügung stehender Fläche, wie etwa ID-1-Karten, eingesetzt werden. Die durch die Zusammenlegung zweier Sicherheitsmerkmale verbleibende größere Fläche belässt dem Designer zudem einen höheren Gestaltungsspielraum.
Overall, the proposed combination of an optically variable recording layer with a laser tipping image in a security element offers the following advantages in particular:
  • The combination of both effects allows the generation of optically multivariable security elements with non-black and white laser marking. Instead, the laser-engraved markings can be colored, in particular with a metallic shiny and / or iridescent visual appearance.
  • The tilting effect of the optically variable recording layer is additionally modified by the lenticular of the laser tilting image. Further Combination and variation possibilities and novel visual effects arise when the recording layer is additionally provided with a relief structure.
  • The forgery security of known laser tipping images is increased by the combination with the optically variable feature. Conversely, the security against forgery of the optically variable feature also increases as a result of the connection with the lenticular grid, with the result that both partial features mutually enhance each other. Since the optically variable effect of the recording layer is modified by the lenticular grid, the tamper resistance of the overall feature is higher than that of two separate individual features.
  • In addition to the security against counterfeiting, the proposed combination also increases the attention and recognition value of the security element. The visual appearance is upgraded and the recognizability of the entire element as an authenticity feature is increased, especially in poor lighting conditions.
  • The combined security element does not require more space on the card than a laser tipping image alone, and therefore can be used on cards with a small footprint, such as ID-1 cards. The larger area remaining due to the merging of two security features also leaves the designer with more creative freedom.

Weitere Ausführungsbeispiele sowie Vorteile der Erfindung werden nachfolgend anhand der Figuren erläutert. Zur besseren Anschaulichkeit wird in den Figuren auf eine maßstabs- oder proportionsgetreue Darstellung verzichtet.Further embodiments and advantages of the invention are explained below with reference to the figures. For better clarity, in omitted the figures on a true to scale or proportions representation.

Es zeigen:

Fig. 1
eine Aufsicht auf eine Karte nach einem Ausführungsbeispiel der Erfindung in schematischer Darstellung, und
Fig. 2
eine Schnittdarstellung der Karte von Fig.1 entlang der Linie II-II.
Show it:
Fig. 1
a plan view of a card according to an embodiment of the invention in a schematic representation, and
Fig. 2
a sectional view of the map of Fig.1 along the line II-II.

Die Erfindung wird nun am Beispiel einer Identifikationskarte erläutert. Figur 1 zeigt dazu eine schematische Darstellung einer Identifikationskarte 10 im ID-1-Format, wie es beispielsweise für Bankkarten, Kreditkarten oder Führerscheine verwendet wird.The invention will now be explained using the example of an identification card. 1 shows a schematic representation of an identification card 10 in ID-1 format, as used for example for bank cards, credit cards or driver's licenses.

Neben in herkömmlicher Weise aufgebrachten, beispielsweise aufgedruckten Daten 12 enthält die Karte 10 zur Absicherung ein Laserkippbild 14, das zwei verschiedene, mittels Laserstrahlung eingeschriebene Kennzeichnungen 16 und 18 enthält, die in Fig.1 schematisch durch die Buchstabenfolgen "A A A" bzw. "B B B" dargestellt sind. Anders als in der zeichnerischen Darstellung der Fig.1 sind die Kennzeichnungen 16,18 bei der Betrachtung der Karte 10 nicht gleichzeitig, sondern nur durch Verkippen der Karte 10 in einem jeweils unterschiedlichen Kippwinkel erkennbar. Das Laserkippbild 14 ist im Ausführungsbeispiel in Form eines horizontalen Linsenrasters ausgebildet, kann aber in anderen Ausführungsformen beispielsweise auch in Form eines vertikalen Linsenrasters ausgebildet sein.In addition to conventionally applied, for example, printed data 12, the card 10 for securing a laser tipping image 14, which contains two different, inscribed by laser radiation markings 16 and 18, in Fig.1 are schematically represented by the letters "AAA" and "BBB". Unlike in the graphic representation of Fig.1 the markings 16,18 when viewing the card 10 not simultaneously, but only by tilting the card 10 in a different tilt angle recognizable. The laser tipping image 14 is formed in the embodiment in the form of a horizontal lens grid, but may be formed in other embodiments, for example, in the form of a vertical lenticular grid.

Trotz der geringen zur Verfügung stehenden Fläche sollen Karten im ID-1-Format oft sowohl mit einem Laserkippbild als auch mit einem optisch variablen Effektfarbendruck, etwa einer Farbschicht mit optisch variablen Pigmenten oder einem Hologramm ausgestattet werden. Da der Effektfarbendruck eine gewisse Mindestfläche benötigt, um seine visuelle Wirkung entfalten zu können, ergeben sich bei bekannten Gestaltungen aufgrund der nötigen Kompromisse oft nicht zufriedenstellende Ergebnisse.Despite the limited space available, cards in the ID-1 format are often designed with both a laser tipping image and an optically variable effect color print, such as a color layer with optically variable pigments or a hologram. Since the effect color printing requires a certain minimum surface area in order to be able to develop its visual effect, the result of known designs is often unsatisfactory due to the necessary compromises.

Zur Abhilfe ist bei der Karte 10 vorgesehen, dass das Laserkippbild 14 und das optisch variable Merkmal in demselben Flächenbereich angeordnet sind, wie anhand der Querschnittsdarstellung der Fig. 2 näher erläutert, die eine Schnittdarstellung der Karte 10 entlang der Linie II-II zeigt.As a remedy, it is provided in the case of the card 10 that the laser tilting image 14 and the optically variable feature are arranged in the same surface area as with reference to the cross-sectional representation of FIG Fig. 2 explained in more detail, which shows a sectional view of the card 10 along the line II-II.

Die Karte 10 enthält einen Kartenkörper 20, der im Bereich des Laserkippbilds 14 mit einer optisch variablen Aufzeichnungsschicht 22 und einer über der Aufzeichnungsschicht 22 transparenten Abstandsschicht 24 versehen ist. Die optisch variable Aufzeichnungsschicht 22 ist im Ausführungsbeispiel eine Farbschicht mit optisch variablen Pigmenten, insbesondere mit Interferenzschichtpigmenten oder mit Flüssigkristallpigmenten. In anderen Gestaltungen kann die optisch variable Aufzeichnungsschicht beispielsweise durch eine diffraktive Beugungsstruktur, wie etwa ein Hologramm oder eine hologrammähnliche Beugungsstruktur, oder eine Mattstruktur gebildet sein. Ferner kann auch der Kartenkörper selbst aus einem transparenten, semitransparenten oder transluzenten Material gebildet sein.The card 10 contains a card body 20, which is provided in the region of the laser tilting image 14 with an optically variable recording layer 22 and a spacer layer 24 transparent over the recording layer 22. The optically variable recording layer 22 is in the exemplary embodiment a color layer with optically variable pigments, in particular with interference layer pigments or with liquid crystal pigments. In other configurations, the optically variable recording layer may be formed, for example, by a diffractive diffraction structure, such as a hologram or a hologram-like diffraction structure, or a matte structure. Furthermore, the card body itself may be formed of a transparent, semi-transparent or translucent material.

Weiter ist die Oberfläche der Karte 10 im Bereich des Laserkippbilds 14 mit einem Oberflächenrelief in Form eines Linsenrasters 26 versehen, das im Ausführungsbeispiel aus einer Mehrzahl horizontaler, paralleler Zylinderlinsen besteht. Die in das Laserkippbild eingebrachten Kennzeichnungen 16, 18 wurden erst nach dem Aufbringen des Linsenrasters 26 mittels eines gepulsten Infrarotlasers in die optisch variable Aufzeichnungsschicht 22 eingeschrieben.Furthermore, the surface of the card 10 in the region of the laser tilting image 14 is provided with a surface relief in the form of a lenticular grid 26, which in the exemplary embodiment consists of a plurality of horizontal, parallel cylindrical lenses. The markings 16 introduced into the laser tipping image, 18 were written into the optically variable recording layer 22 only after the application of the lens grid 26 by means of a pulsed infrared laser.

Dazu wird ein Laserstrahl aus verschiedenen Richtungen 30 bzw. 32 auf das Linsenraster 26 gerichtet. Die einzelnen Zylinderlinsen fokussieren den Laserstrahl je nach Bestrahlungsrichtung 30, 32 auf unterschiedliche kleine Teilbereiche 40 bzw. 42 der optisch variablen Aufzeichnungsschicht 22. Wellenlänge, Intensität und Pulsdauer der Laserstrahlung sind dabei so auf die Eigenschaften der Aufzeichnungsschicht 22 abgestimmt, dass die Teilbereiche 40, 42 nicht geschwärzt werden, sondern aufgrund ihrer durch die Laserstrahlung lokal veränderten optischen Eigenschaften vor dem Hintergrund der nicht beaufschlagten Bereiche visuell erkennbar werden. Die Teilbereiche 40 bilden zusammengenommen die Kennzeichnung 16 der Fig. 1, die Teilbereiche 42 die Kennzeichnungen 18. Das Erscheinungsbild der Kennzeichnungen 16,18 innerhalb der optisch variablen Aufzeichnungsschicht 22 ist visuell deutlich attraktiver als die üblichen geschwärzten Bereiche eines weißen Kartenkörpers.For this purpose, a laser beam from different directions 30 and 32 is directed to the lens grid 26. Depending on the direction of irradiation 30, 32, the individual cylindrical lenses focus the laser beam on different small subregions 40 and 42 of the optically variable recording layer 22. Wavelength, intensity and pulse duration of the laser radiation are matched to the properties of the recording layer 22 such that the subregions 40, 42 are not blackened, but visually recognizable because of their laser radiation by the locally changed optical properties against the background of the non-impacted areas. The sections 40 together form the marking 16 of Fig. 1 , the subregions 42, the markings 18. The appearance of the markings 16,18 within the optically variable recording layer 22 is visibly more attractive visually than the usual blackened areas of a white card body.

Bei der späteren Betrachtung der Karte 10 aus Richtung 30 sind wegen der fokussierenden Wirkung der Zylinderlinsen gerade die aus dieser Richtung eingeschriebenen Teilbereiche 40 erkennbar, die sich für den Betrachter 50 zu einem Bild, im Ausführungsbeispiel den Buchstaben "A A A" der Kennzeichnung 16 zusammensetzen. Entsprechend sind aus der Betrachtungsrichtung 32 die aus dieser Richtung eingeschriebenen Teilbereiche 42 erkennbar und setzen sich für den Betrachter 50 zu einem Bild der Buchstaben "B B B" der Kennzeichnung 18 zusammen. Aus den flacheren Betrachtungsrichtungen 34, 36 zeigen die Zylinderlinsen jeweils nur nicht durch Laserstrahlung modifizierte Teilbereiche der optisch variablen Aufzeichnungsschicht 22, die keine Kennzeichnungen enthalten. Im Falle eines transparenten, semi-transparenten oder transluzenten Kartenkörpers 20 sind die Schwärzungen auch von der Kartenunterseite, d.h. der den Linsen abgewandten Seite erkennbar.In the later examination of the card 10 from the direction 30, the sub-regions 40 inscribed in this direction can be seen because of the focusing effect of the cylindrical lenses, which form an image for the observer 50, in the exemplary embodiment the letter "AAA" of the marking 16. Correspondingly, the partial regions 42 inscribed in this direction can be recognized from the viewing direction 32 and, for the observer 50, form an image of the letters "BBB" of the marking 18. From the shallower viewing directions 34, 36, the cylindrical lenses each show only portions of the optically variable recording layer that are not modified by laser radiation 22, which contain no markings. In the case of a transparent, semi-transparent or translucent card body 20, the blackening can also be seen from the underside of the card, ie the side facing away from the lenses.

Insgesamt weist das Laserkippbild 14 der Karte 10 somit bei der Betrachtung ein optisch doppelt variables Erscheinungsbild auf. Der erste optisch variable Effekt ist durch den Kippeffekt des Laserkippbilds 14 gegeben: Wird die Karte von der Betrachtungsrichtung 34 über die Betrachtungsrichtungen 30 und 32 zur Betrachtungsrichtung 36 hin gekippt, so sieht der Betrachter zunächst die Aufzeichnungsschicht 22 ohne Kennzeichnung (Betrachtungsrichtung 34). Aus der Betrachtungsrichtung 30 wird die erste Kennzeichnung 16 sichtbar, aus der Betrachtungsrichtung 32 dann die zweite Kennzeichnung 18, bis aus der Betrachtungsrichtung 36 wieder nur die Aufzeichnungsschicht 22 ohne Kennzeichnungen zu erkennen ist.Overall, the laser tilting image 14 of the card 10 thus has an optically double-variable appearance when viewed. The first optically variable effect is given by the tilting effect of the laser tilting image 14: If the card is tilted from the viewing direction 34 over the viewing directions 30 and 32 towards the viewing direction 36, the viewer first sees the recording layer 22 without marking (viewing direction 34). From the viewing direction 30, the first marking 16 is visible, then from the viewing direction 32 the second marking 18, until from the viewing direction 36 again only the recording layer 22 without markings can be recognized.

Der zweite optisch variable Effekt wird durch die optische Variabilität der Aufzeichnungsschicht 22 erzeugt und hängt von der Art der gewählten Aufzeichnungsschicht 22 ab. Bei dem zweiten optisch variablen Effekt kann es sich beispielsweise um einen betrachtungswinkelabhängigen Farbkippeffekt handeln, der dem Betrachter einen sich mit der Betrachtungsrichtung ändernden Farbeindruck vermittelt. Auch betrachtungswinkelabhängige Beugungseffekte, streuende Effekte oder refraktive Effekte kommen in Frage. Durch die Lichtbrechung der Zylinderlinsen des Linsenrasters 26 wird der zweite optisch variable Effekt der Aufzeichnungsschicht 22 verglichen mit einer separat vorliegenden Aufzeichnungsschicht noch modifiziert.The second optically variable effect is generated by the optical variability of the recording layer 22 and depends on the type of the selected recording layer 22. The second optically variable effect may, for example, be a viewing-angle-dependent color-shift effect, which conveys to the viewer a color impression that changes with the viewing direction. Viewing angle dependent diffraction effects, scattering effects or refractive effects are also possible. The refraction of the cylindrical lenses of the lens grid 26 further modifies the second optically variable effect of the recording layer 22 compared to a separately present recording layer.

In vorteilhaften Ausgestaltungen kann die optisch variable Aufzeichnungsschicht 22 zusätzlich mit einer Reliefstruktur, beispielsweise einer Prägestruktur versehen sein. In Verbindung mit der brechenden Wirkung des Linsenrasters 26 ergeben sich dadurch eindrucksvolle visuelle Effekte. Beispielsweise können trotz gleichen Lichteinfalls unterschiedliche Farbeindrücke wahrzunehmen sein, oder die Veränderung des Kippeffekts durch das Linsenraster kann ein dreidimensional anmutendes, optisch variables Erscheinungsbild erzeugen.In advantageous embodiments, the optically variable recording layer 22 may additionally have a relief structure, for example an embossed structure be provided. In conjunction with the refractive effect of the lens grid 26, this results in impressive visual effects. For example, despite the same incidence of light, different color impressions can be perceived, or the change of the tilting effect by the lenticular grid can produce a three-dimensional appearing, optically variable appearance.

Claims (16)

  1. An optically variable security element for safeguarding data carriers (10), in which there are incorporated by action of laser radiation visually recognizable markings (16, 18) in the form of patterns, characters or a coding, characterized in that the security element contains an optically variable recording layer (22) having a first tilt effect which is provided at least partly with a surface relief in the form of a lenticular grid (26), wherein at least first and second markings (16, 18) are incorporated with laser radiation from different directions (30, 32) through the lenticular grid into the optically variable recording layer, which markings are respectively recognizable upon viewing from the same directions and form a further tilt effect.
  2. The security element according to claim 1, characterized in that the optically variable recording layer is an ink layer with optically variable pigments, in particular with interference-layer pigments, with mica pigments or with liquid-crystal pigments.
  3. The security element according to claim 1, characterized in that the optically variable recording layer is a diffractive diffraction structure, in particular a hologram or a hologram-like diffractive structure or a matt structure.
  4. The security element according to claim 1, characterized in that the optically variable recording layer is formed by a metallized hot stamping foil.
  5. The security element according to at least one of claims 1 to 4, characterized in that the optically variable recording layer is provided with a relief structure.
  6. The security element according to at least one of claims 1 to 5, characterized in that the markings represent non-blackened partial regions of the optically variable recording layer, which are visually recognizable due to their optical properties changed by the laser radiation.
  7. The security element according to at least one of claims 1 to 6, characterized in that the lenticular grid comprises cylindrical lenses and/or spherical lenses.
  8. The security element according to at least one of claims 1 to 7, characterized in that the optically variable recording layer is separated from the lenticular grid by a transparent spacer layer.
  9. The security element according to at least one of claims 1 to 8, characterized in that the optically variable recording layer is arranged in the interior of the security element.
  10. The security element according to at least one of claims 1 to 9, characterized in that the first and second markings recognizable from different directions are present in the optically variable recording layer in mutually interlaced manner.
  11. The security element according to at least one of claims 1 to 10, characterized in that the card body is of transparent, semi-transparent or translucent configuration.
  12. A method for manufacturing an optically variable security element for safeguarding data carriers, in which there are incorporated by action of laser radiation visually recognizable markings in the form of patterns, characters or a coding, characterized in that
    - an optically variable recording layer having a first tilt effect is provided at least partly with a surface relief in the form of a lenticular grid; and
    - at least first and second markings are incorporated with laser radiation from different directions through the lenticular grid into the optically variable recording layer, which markings are respectively recognizable upon a later viewing of the security element from the same directions and form a further tilt effect.
  13. The method according to claim 12, characterized in that the grid elements are produced by irradiation of the lenticular grid with laser pulses.
  14. The method according to at least one of claims 12 or 13, characterized in that the lenticular grid is produced by laminating or embossing, where applicable via a transparent intermediate layer above the optically variable recording layer.
  15. A data carrier, in particular branded article, value document, identification card and the like, having a security element according to any of claims 1 to 11 or a security element manufacturable according to any of claims 12 to 14.
  16. The data carrier according to claim 15, characterized in that the data carrier represents a card, such as a credit card, bank card, cash payment card, authorization card, an identity card or a passport personalization page.
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DE102015015991A1 (en) 2015-12-10 2017-06-14 Giesecke & Devrient Gmbh Security element with lenticular image
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EP2391512A1 (en) 2011-12-07
DE102009006301A1 (en) 2010-07-29

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