EP3196044B1 - Data carrier with film security element - Google Patents

Data carrier with film security element Download PDF

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Publication number
EP3196044B1
EP3196044B1 EP17000082.2A EP17000082A EP3196044B1 EP 3196044 B1 EP3196044 B1 EP 3196044B1 EP 17000082 A EP17000082 A EP 17000082A EP 3196044 B1 EP3196044 B1 EP 3196044B1
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EP
European Patent Office
Prior art keywords
data carrier
region
photochromic
security element
modified
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.)
Active
Application number
EP17000082.2A
Other languages
German (de)
French (fr)
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EP3196044A1 (en
Inventor
Andreas Zinke
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.)
Veridos GmbH
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Veridos GmbH
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Publication date
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Priority to PL17000082T priority Critical patent/PL3196044T3/en
Publication of EP3196044A1 publication Critical patent/EP3196044A1/en
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Publication of EP3196044B1 publication Critical patent/EP3196044B1/en
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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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • 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
    • B42D25/24—Passports
    • 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
    • B42D25/309—Photographs
    • 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
    • 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

Definitions

  • the invention relates to a data carrier, in particular a value or security document, with a film security element, and a manufacturing method for such a data carrier.
  • Data carriers such as banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports or other identity documents, are often provided with security elements for security, which allow a verification of the authenticity of the value document and at the same time serve as protection against unauthorized reproduction.
  • security elements for security, which allow a verification of the authenticity of the value document and at the same time serve as protection against unauthorized reproduction.
  • transparent security features such as see-through windows in identification cards and other identity documents are becoming increasingly attractive.
  • see-through security features are often personalized using laser engraving equipment. If such facilities are also available to counterfeiters, personal information may be subsequently manipulated or falsified.
  • ID documents are partially equipped with negative images that show an inverse effect on positive images when exposed to laser light.
  • compensation layers or further functional layers usually have to be provided in the document, so that the production is complicated and cost-intensive because of the many manual steps required.
  • a security device for a security substrate which comprises a carrier made of at least partially translucent material Polymer material, wherein the carrier has a plurality of fine opaque lines, which are separated by gaps.
  • the appearance of the lines may be increased or decreased by increasing the width of the lines, by changing the density of the lines, by changing the color of the lines, by dividing the lines into several smaller lines, by activating an activatable material or by using an optical variable medium in areas to be changed.
  • the invention has for its object to provide a data carrier of the type mentioned, which can be provided in a simple and cost-effective manner with a hidden, personalizable security element. Ideally, the personalized information contained in the security element is sustainably protected and the data carrier can easily be verified with the aid of the security element.
  • the invention is also intended to provide a suitable method for producing such data carriers. This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.
  • a data carrier according to the invention is defined in claim 1.
  • Photochromism refers to a reversible change in state of a substance caused by exposure to light, in particular a color change.
  • the reverse reaction can take place spontaneously with a specific time constant or likewise photochemically by irradiation with light of a different wavelength.
  • the reversibility of the change of state is an essential feature of photochromism, which distinguishes it from other light-induced reactions.
  • inorganic and organic photochromic substances are known per se and can be used in the context of the present invention.
  • Spiropyrane are about colorless in the initial state and go on irradiation with UV light in a blue state, which can be converted by irradiation with visible light back to the colorless state.
  • the feature area of the film security element can be arranged in an opaque area of the data carrier, but at present it is preferred that the feature area is arranged in a see-through area of the data carrier, since in this way, in particular see-through security elements can be protected effectively and reliably.
  • the action of light can usually take place from both sides, so that the photochromic effect can be triggered, for example, by the action of light from the rear side, while the viewing takes place from the front side.
  • the modified subregion is preferably designed in the form of patterns, characters or codes.
  • the modified subarea comprises a personalized identification, for example the name, a date of birth or a portrait of a user or holder of an identification document.
  • the modified subarea may, for example, also include a nationality, the issuing authority or the issue date of an identity document.
  • the modified subregion forms a hidden marking which has substantially no contrast to the surrounding regions of the feature region without the action of light on the film security element.
  • the film security element is applied to the data carrier, for example glued.
  • the data carrier represents a multilayer data carrier and the film security element forms an inner layer of the multilayer data carrier.
  • the foil security element can also occupy only a portion of the volume surface.
  • one or both sides of the foil security element advantageously includes an opaque layer of the data carrier.
  • the opaque layer or the opaque layers are expediently expedient in the feature area, so that the view of the feature area is released from at least one side of the data carrier.
  • the data carrier is advantageously an identification card, in particular an identity card, a data page for a document of identification, a bank card, a credit card or a driver's license.
  • the invention also includes a method as defined in claim 8 for manufacturing a data carrier with a film security element.
  • the photochromic substance is modified by the action of laser radiation, but it is also possible to produce the modification with a strong, in particular focused light source.
  • the modification of the photochromic substance can be carried out prior to integration or application of the photochromic film in or on the data carrier. However, it is particularly advantageous if the photochromic substance is modified only after the incorporation / application of the photochromic film in / on a multilayer data carrier. In this way, the data carrier with the photochromic film can be produced at a production site and later personalized at another location, that is to say provided with personal data of a user.
  • the photochromic film may also already be partially pre-modified.
  • a generic motif such as a state coat of arms, can already be introduced into the feature area by laser application during the production of the document.
  • Another, individual motif such as a portrait of the cardholder, however, is later inscribed in the photochromic film in connection with the issue of the identity document to a specific owner.
  • FIG. 1 shows an identification card 10, such as an identity card, bank card, credit card or driver's license.
  • the identification card 10 typically includes a plurality of open tags, such as a serial number 12 or a portrait 14 of the cardholder.
  • the identification card 10 has a hidden tag 16 integrated with a photochromic film security element 20.
  • the hidden label 16 is not visible under normal viewing conditions and in FIG Fig. 1 therefore only indicated dotted. Rather, the film security element 20 appears structurally transparent under normal viewing conditions.
  • a motif-shaped subregion of the film security element 20 shows a significant change in color, while the remaining areas of the film element remain unchanged, so that the 16 formed by the motif-shaped portion of marking 16 appears in high contrast in appearance. After completion of the lighting, the color change is completely back, so that the label 16 fades and after some time, the original, featureless appearance of the film security element 20 sets again.
  • the film security element 20 is arranged in a see-through region 18 of the identification card 10, so that the action of light can take place both from the front side and from the back side of the card.
  • a photochromic film security element 20 can also be arranged in an opaque subarea of a data carrier, as described below with reference to FIG Fig. 4 explained.
  • FIGS Figures 2 and 3 show Fig. 2 the identification card 10 initially in the initial state without Lichtbeierschlagung, ie under normal viewing conditions. It puts Fig. 2 (a) a cross section of the map along the line AA the Fig. 1 and Fig. 2 (b) schematically shows the visual appearance of the film security element 20 in supervision.
  • the layer sequence of the identification card 10 contains in this order a first transparent cover film 22, a first opaque film 24, a photochromic film 30 forming the photochromic film security element 20, a second opaque film 26 and a second transparent cover film 28.
  • the Both opaque films 24, 26 are recessed congruent in the see-through area 18 of the identification card 10, so that there the view of the photochromic film 30 is released.
  • the photochromic film 30 contains in a feature region a photochromic substance which, upon exposure to light, exhibits a reversible state change, in particular a color change.
  • the photochromic substance is colorless transparent in the initial state and reversibly turns into a state of blue color upon excitation by UV irradiation.
  • the back reaction to the colorless state occurs spontaneously with a certain time constant, but can also be accelerated by irradiation with visible light.
  • the photochromic substance was deactivated by the action of laser radiation in a marking region 32, that is, the photochromic substance was modified so that it no longer shows any color change on illumination.
  • the inventors have found that it is possible by appropriate adjustment of the laser parameters on the photochromic substance used in each case to mitigate the photochromic properties of the photochromic substance or even completely disable, without causing a further, always recognizable changes in the visual appearance.
  • the identification region 32 with the modified (deactivated) photochromic substance can therefore not be distinguished from the surrounding region 34 with the unmodified photochromic substance without the action of light.
  • the film security element 20 thus appears as a structureless transparent surface 36, as in FIG Fig. 2 (b) shown.
  • the modified identification region 32 can easily be formed in the form of desired patterns, characters or codes.
  • the identification area 32 in the exemplary embodiment represents a copy of the portrait 14 of the cardholder.
  • the photochromic film security element 20 is then illuminated with suitable light 42 of a light source 40, as in FIG Fig. 3
  • the unmodified photochromic substance in region 34 shows the desired color change, in this case from colorless to blue, while the deactivated photochromic substance in region 32 remains unchanged colorlessly transparent. Therefore, after exposure to the light, when viewing the film security member 20, the portrait of the cardholder formed by the tagging portion 32 becomes rich in contrast, as in FIG Fig. 3 (b) illustrated. Since the photochromic portrait 32 has a copy of the open portrait 14 (FIG. Fig. 1 ), it can easily be checked for consistency by the viewer and thus used for an additional authenticity check of the card 10.
  • the security element 20 spontaneously returns to the colorless state with a certain time constant Fig. 2 (b) or may be returned to the colorless state by further irradiation with light of other wavelengths.
  • the reversible change of state can be triggered as often as required by renewed lighting.
  • FIG. 4 shows as another embodiment an identification card 50, wherein the feature area 38 of the photochromic film security element 20 is disposed in an opaque region of the identification card 50.
  • the layer sequence of the identification card 50 in the relevant subarea contains a first transparent cover film 22, a continuous opaque film 52, a photochrome film 30 forming the photochromic film security element 20, and a second transparent cover film 28.
  • the photochromic sheet 30 contains in the feature area 38 a photochromic substance which has been deactivated by the action of laser radiation in a motif-type marking area 32, while remaining unmodified in the areas 34 outside the marking area 32.
  • the unmodified photochromic substance When illuminated with a suitable light source 40, the unmodified photochromic substance then shows the desired color change in region 34, while the deactivated photochromic substance in region 32 does not change its appearance. After exposure to light, therefore, the motif formed by the marking area 32 appears in high contrast and can serve as an authenticity assurance of the identification card 50.

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

Description

Die Erfindung betrifft einen Datenträger, insbesondere ein Wert- oder Sicherheitsdokument, mit einem Foliensicherheitselement, sowie ein Herstellungsverfahren für einen derartigen Datenträger.The invention relates to a data carrier, in particular a value or security document, with a film security element, and a manufacturing method for such a data carrier.

Datenträger, wie beispielsweise Banknoten, Aktien, Anleihen, Urkunden, Gutscheine, Schecks, hochwertige Eintrittskarten, aber auch andere fälschungsgefährdete Papiere, wie Pässe oder sonstige Ausweisdokumente, werden zur Absicherung oft mit Sicherheitselementen versehen, die eine Überprüfung der Echtheit des Wertdokuments gestatten und die zugleich als Schutz vor unerlaubter Reproduktion dienen. Dabei gewinnen zunehmend Durchsichtssicherheitsmerkmale, wie etwa Durchsichtsfenster in Identifikationskarten und anderen Ausweisdokumenten an Attraktivität.Data carriers, such as banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other forgery-prone papers, such as passports or other identity documents, are often provided with security elements for security, which allow a verification of the authenticity of the value document and at the same time serve as protection against unauthorized reproduction. In the process, transparent security features such as see-through windows in identification cards and other identity documents are becoming increasingly attractive.

Gegenwärtig werden Durchsichtssicherheitsmerkmale oft mit Hilfe von Lasergravuranlagen personalisiert. Falls Fälschern solche Anlagen ebenfalls zur Verfügung stehen, können personenbezogene Angaben unter Umständen nachträglich manipuliert oder verfälscht werden. Um solche Manipulationen zu verhindern, werden Ausweisdokumenten teilweise mit Negativ-Bildern ausgestattet, die bei Laserbeaufschlagung eine zu Positiv-Bildern inverse Wirkung zeigen. Allerdings müssen bei der Herstellung solcher Negativ-Bilder meist Kompensationsschichten oder weitere funktionelle Schichten im Dokument vorgesehen werden, so dass die Herstellung wegen der vielen erforderlichen manuellen Arbeitsschritte aufwendig und kostenintensiv ist.At present, see-through security features are often personalized using laser engraving equipment. If such facilities are also available to counterfeiters, personal information may be subsequently manipulated or falsified. In order to prevent such manipulation, ID documents are partially equipped with negative images that show an inverse effect on positive images when exposed to laser light. However, in the production of such negative images compensation layers or further functional layers usually have to be provided in the document, so that the production is complicated and cost-intensive because of the many manual steps required.

Aus der Druckschrift EP 1 928 669 B1 ist eine Sicherheitsvorrichtung für ein Sicherheitssubstrat bekannt, die einen Träger aus zumindest teilweise lichtdurchlässigem Polymermaterial umfasst, wobei der Träger mehrere feine opake Linien aufweist, die durch Zwischenräume getrennt sind. Das Erscheinungsbild der Linien kann dabei durch Vergrößern oder Verringern der Breite der Linien, durch Verändern der Dichte der Linien, durch Verändern der Farbe der Linien, durch Aufteilen der Linien in mehrere kleinere Linien, durch die Aktivierung eines aktivierbaren Materials oder durch die Verwendung eines optisch variablen Mediums in Bereichen verändert werden.From the publication EP 1 928 669 B1 For example, a security device for a security substrate is known which comprises a carrier made of at least partially translucent material Polymer material, wherein the carrier has a plurality of fine opaque lines, which are separated by gaps. The appearance of the lines may be increased or decreased by increasing the width of the lines, by changing the density of the lines, by changing the color of the lines, by dividing the lines into several smaller lines, by activating an activatable material or by using an optical variable medium in areas to be changed.

Die Dokumente US 5 289 547 A und DE 10 2011 010 127 A1 offenbaren Datenträger mit photochromen Stoffen.The documents US 5 289 547 A and DE 10 2011 010 127 A1 disclose media with photochromic substances.

Das Dokument DE 10 2008 005 136 A1 offenbart einen Datenträger nach dem Oberbegriff des unabhängigen Anspruchs 1.The document DE 10 2008 005 136 A1 discloses a data carrier according to the preamble of independent claim 1.

Der Erfindung liegt die Aufgabe zugrunde, einen Datenträger der eingangs genannten Art anzugeben, der in einfacher und kostengünstiger Art mit einem versteckten, personalisierbaren Sicherheitselement versehen werden kann. Idealerweise ist die im Sicherheitselement enthaltene personalisierte Information nachhaltig geschützt und der Datenträger mit Hilfe des Sicherheitselements leicht zu verifizieren. Die Erfindung soll auch ein geeignetes Verfahren zur Herstellung solcher Datenträger bereitstellen. Diese Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst. Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.The invention has for its object to provide a data carrier of the type mentioned, which can be provided in a simple and cost-effective manner with a hidden, personalizable security element. Ideally, the personalized information contained in the security element is sustainably protected and the data carrier can easily be verified with the aid of the security element. The invention is also intended to provide a suitable method for producing such data carriers. This object is solved by the features of the independent claims. Further developments of the invention are the subject of the dependent claims.

Ein Datenträger gemäß der Erfindung ist in dem Anspruch 1 definiert.A data carrier according to the invention is defined in claim 1.

Photochromie bezeichnet dabei eine durch Lichteinwirkung hervorgerufene reversible Zustandsänderung einer Substanz, insbesondere eine Farbänderung. Die Rückreaktion kann dabei spontan mit einer bestimmten Zeitkonstante oder ebenfalls photochemisch durch Bestrahlen mit Licht einer anderen Wellenlänge erfolgen. Dabei ist die Reversibilität der Zustandsänderung ein wesentliches Kennzeichen der Photochromie, das sie von anderen lichtinduzierten Reaktionen unterscheidet.Photochromism refers to a reversible change in state of a substance caused by exposure to light, in particular a color change. The reverse reaction can take place spontaneously with a specific time constant or likewise photochemically by irradiation with light of a different wavelength. The reversibility of the change of state is an essential feature of photochromism, which distinguishes it from other light-induced reactions.

Zahlreiche anorganische und organische photochrome Substanzen sind an sich bekannt und können im Rahmen der vorliegenden Erfindung eingesetzt werden. Beispielhaft sei etwa das im Ausgangszustand orangefarbene Triphenylfulgid genannt, das sich bei Bestrahlung mit kurzwelligem Licht bläulich färbt und dessen ursprüngliche Färbung sich im Dunklen oder bei Bestrahlung mit rotem Licht wieder einstellt. Spiropyrane sind etwa im Ausgangszustand farblos und gehen bei Bestrahlung mit UV-Licht in einen blauen Zustand über, der durch Bestrahlung mit sichtbarem Licht wieder in den farblosen Zustand überführt werden kann.Numerous inorganic and organic photochromic substances are known per se and can be used in the context of the present invention. By way of example, mention may be made of the orange-colored triphenylfulgide in the initial state, which turns bluish upon irradiation with short-wave light and whose original color changes again in the dark or upon irradiation with red light. Spiropyrane are about colorless in the initial state and go on irradiation with UV light in a blue state, which can be converted by irradiation with visible light back to the colorless state.

Der Merkmalsbereich des Foliensicherheitselements kann in einem opaken Bereich des Datenträgers angeordnet sein, bevorzugt ist derzeit allerdings, dass der Merkmalsbereich in einem Durchsichtsbereich des Datenträgers angeordnet ist, da auf diese Weise insbesondere Durchsichtssicherheitselemente wirkungsvoll und zuverlässig abgesichert werden können. Zudem kann bei Durchsichtssicherheitselementen die Lichteinwirkung meist von beiden Seiten erfolgen, so dass der photochrome Effekt beispielsweise durch Lichteinwirkung von der Rückseite ausgelöst werden kann, während die Betrachtung von der Vorderseite her erfolgt.The feature area of the film security element can be arranged in an opaque area of the data carrier, but at present it is preferred that the feature area is arranged in a see-through area of the data carrier, since in this way, in particular see-through security elements can be protected effectively and reliably. In addition, in the case of see-through security elements, the action of light can usually take place from both sides, so that the photochromic effect can be triggered, for example, by the action of light from the rear side, while the viewing takes place from the front side.

Der modifizierte Teilbereich ist bevorzugt in Form von Mustern, Zeichen oder Codierungen ausgebildet. In besonders vorteilhaften Ausgestaltungen umfasst der modifizierte Teilbereich eine personalisierte Kennzeichnung, beispielsweise den Namen, ein Geburtsdatum oder ein Portrait eines Benutzers oder Inhabers eines Ausweisdokuments. Der modifizierte Teilbereich kann aber beispielsweise auch eine Nationalität, die Ausstellungsbehörde oder das Ausstellungsdatum eines Ausweisdokuments enthalten.The modified subregion is preferably designed in the form of patterns, characters or codes. In particularly advantageous embodiments, the modified subarea comprises a personalized identification, for example the name, a date of birth or a portrait of a user or holder of an identification document. However, the modified subarea may, for example, also include a nationality, the issuing authority or the issue date of an identity document.

Erfindungsgemäß bildet der modifizierte Teilbereich eine verborgene Kennzeichnung, die ohne Lichteinwirkung auf das Foliensicherheitselement im Wesentlichen keinen Kontrast zu den umgebenden Bereichen des Merkmalsbereichs aufweist.
In zweckmäßigen Gestaltungen ist das Foliensicherheitselement auf den Datenträger aufgebracht, beispielsweise aufgeklebt. Bevorzugt sind gegenwärtig allerdings Gestaltungen, bei denen der Datenträger einen mehrschichtigen Datenträger darstellt und das Foliensicherheitselement eine innere Schicht des mehrschichtigen Datenträgers bildet. Das Foliensicherheitselement kann dabei auch nur einen Teilbereich der Datenträgerfläche einnehmen.
In allen Gestaltungsvarianten schließt auf einer oder auf beiden Seiten des Foliensicherheitselements mit Vorteil eine opake Schicht des Datenträgers an. Die opake Schicht bzw. die opaken Schichten sind dabei im Merkmalbereich zweckmäßig ausgespart, so dass der Blick auf den Merkmalsbereich von zumindest einer Seite des Datenträgers her freigegeben wird. Schließt nur auf einer Seite des Foliensicherheitselements eine opake Schicht an, so kann, muss diese aber nicht zwingend im Merkmalsbereich ausgespart sein. Der Datenträger stellt mit Vorteil eine Identifikationskarte, insbesondere eine Ausweiskarte, eine Datenseite für ein Ausweisdokument, eine Bankkarte, eine Kreditkarte oder einen Führerschein dar.According to the invention, the modified subregion forms a hidden marking which has substantially no contrast to the surrounding regions of the feature region without the action of light on the film security element.
In appropriate configurations, the film security element is applied to the data carrier, for example glued. However, designs are currently preferred in which the data carrier represents a multilayer data carrier and the film security element forms an inner layer of the multilayer data carrier. The foil security element can also occupy only a portion of the volume surface.
In all design variants, one or both sides of the foil security element advantageously includes an opaque layer of the data carrier. The opaque layer or the opaque layers are expediently expedient in the feature area, so that the view of the feature area is released from at least one side of the data carrier. closes an opaque layer on only one side of the film security element can, however, not necessarily be omitted in the feature area. The data carrier is advantageously an identification card, in particular an identity card, a data page for a document of identification, a bank card, a credit card or a driver's license.

Die Erfindung enthält auch ein in dem Anspruch 8 definiertes Verfahren zum Herstellen eines Datenträgers mit einem Foliensicherheitselement.The invention also includes a method as defined in claim 8 for manufacturing a data carrier with a film security element.

Bevorzugt wird die photochrome Substanz durch Einwirkung von Laserstrahlung modifiziert, es ist jedoch auch möglich, die Modifikation mit einer starken, insbesondere fokussierten Lichtquelle zu erzeugen.Preferably, the photochromic substance is modified by the action of laser radiation, but it is also possible to produce the modification with a strong, in particular focused light source.

Die Modifikation der photochromen Substanz kann vor der Integration oder dem Aufbringen der photochromen Folie in bzw. auf den Datenträger erfolgen. Besonders vorteilhaft ist es allerdings, wenn die photochrome Substanz erst nach dem Integrieren/Aufbringen der photochromen Folie in/auf einen mehrschichtigen Datenträger modifiziert wird. Auf diese Weise kann der Datenträger mit der photochromen Folie an einer Produktionsstätte erzeugt und später an einem anderen Ort personalisiert, also mit personenbezogenen Daten eines Benutzers versehen werden.The modification of the photochromic substance can be carried out prior to integration or application of the photochromic film in or on the data carrier. However, it is particularly advantageous if the photochromic substance is modified only after the incorporation / application of the photochromic film in / on a multilayer data carrier. In this way, the data carrier with the photochromic film can be produced at a production site and later personalized at another location, that is to say provided with personal data of a user.

Die photochrome Folie kann auch bereits teilweise vormodifiziert sein. Beispielsweise kann bei einem Ausweisdokument ein generisches Motiv, wie etwa ein Staatswappen bereits bei der Herstellung des Dokuments durch Laserbeaufschlagung in den Merkmalsbereich eingebracht werden. Ein weiteres, individuelles Motiv, wie etwa ein Portrait des Ausweisinhabers wird dagegen erst später im Zusammenhang mit der Ausgabe des Ausweisdokuments an einen bestimmten Inhaber in die photochrome Folie eingeschrieben.The photochromic film may also already be partially pre-modified. For example, in the case of a document of identification, a generic motif, such as a state coat of arms, can already be introduced into the feature area by laser application during the production of the document. Another, individual motif, such as a portrait of the cardholder, however, is later inscribed in the photochromic film in connection with the issue of the identity document to a specific owner.

Weitere Ausführungsbeispiele sowie Vorteile der Erfindung werden nachfolgend anhand der Figur erläutert, bei deren Darstellung auf eine maßstabs- und proportionsgetreue Wiedergabe verzichtet wurde, um die Anschaulichkeit zu erhöhen.Further embodiments and advantages of the invention are explained below with reference to the figure, was omitted in their representation on a scale and proportionate reproduction in order to increase the clarity.

Es zeigen:

Fig. 1
eine schematische Darstellung einer Identifikationskarte nach einem Ausführungsbeispiel der Erfindung,
Fig. 2
die Identifikationskarte der Fig. 1 im Ausgangzustand ohne Lichtbeaufschlagung, wobei (a) einen Querschnitt entlang der Linie A-A der Fig. 1 zeigt, und in (b) schematisch das visuelle Erscheinungsbild des Foliensicherheitselements der Identifikationskarte in Aufsicht dargestellt ist,
Fig.3
in (a) und (b) eine Darstellung wie in Fig. 2, allerdings nach Beleuchtung des photochromen Foliensicherheitselements mit einer geeigneten Lichtquelle, und
Fig. 4
eine Identifikationskarte, bei der der Merkmalsbereich eines photochromen Foliensicherheitselements in einem opaken Bereich der Identifikationskarte angeordnet ist.
Show it:
Fig. 1
a schematic representation of an identification card according to an embodiment of the invention,
Fig. 2
the identification card of the Fig. 1 in the initial state without exposure to light, wherein (a) a cross section along the line AA of Fig. 1 shows and in (b) schematically the visual appearance of the film security element of the identification card is shown in plan view,
Figure 3
in (a) and (b) a representation as in Fig. 2 but after illumination of the photochromic film security element with a suitable light source, and
Fig. 4
an identification card in which the feature area of a photochromic film security element is arranged in an opaque area of the identification card.

Die Erfindung wird nun am Beispiel einer Identifikationskarte erläutert. Figur 1 zeigt dazu eine Identifikationskarte 10, wie etwa eine Ausweiskarte, Bankkarte, Kreditkarte oder einen Führerschein. Die Identifikationskarte 10 enthält typischerweise mehrere offene Kennzeichnungen, wie etwa eine Seriennummer 12 oder ein Portrait 14 des Karteninhabers. Zusätzlich weist die Identifikationskarte 10 eine verborgene Kennzeichnung 16 auf, die in ein photochromes Foliensicherheitselement 20 integriert ist. Die verborgene Kennzeichnung 16 ist bei normalen Betrachtungsbedingungen nicht sichtbar und in Fig. 1 daher nur punktiert angedeutet. Vielmehr erscheint das Foliensicherheitselement 20 bei normalen Betrachtungsbedingungen strukturlos transparent.The invention will now be explained using the example of an identification card. FIG. 1 shows an identification card 10, such as an identity card, bank card, credit card or driver's license. The identification card 10 typically includes a plurality of open tags, such as a serial number 12 or a portrait 14 of the cardholder. In addition, the identification card 10 has a hidden tag 16 integrated with a photochromic film security element 20. The hidden label 16 is not visible under normal viewing conditions and in FIG Fig. 1 therefore only indicated dotted. Rather, the film security element 20 appears structurally transparent under normal viewing conditions.

Wird das Foliensicherheitselement 20 mit einer starken Lichtquelle beleuchtet, so zeigt ein motivförmiger Teilbereich des Foliensicherheitselements 20 eine deutliche Farbänderung, während die verbleibenden Bereiche des Folienelements unverändert bleiben, so dass die durch den motivförmigen Teilbereich gebildete Kennzeichnung 16 kontrastreich in Erscheinung tritt. Nach Beendigung der Beleuchtung bildet sich die Farbänderung vollständig zurück, so dass die Kennzeichnung 16 verblasst und sich nach einiger Zeit wieder das ursprüngliche, strukturlose Erscheinungsbild des Foliensicherheitselements 20 einstellt.If the film security element 20 is illuminated with a strong light source, then a motif-shaped subregion of the film security element 20 shows a significant change in color, while the remaining areas of the film element remain unchanged, so that the 16 formed by the motif-shaped portion of marking 16 appears in high contrast in appearance. After completion of the lighting, the color change is completely back, so that the label 16 fades and after some time, the original, featureless appearance of the film security element 20 sets again.

Im Ausführungsbeispiel ist das Foliensicherheitselement 20 in einem Durchsichtsbereich 18 der Identifikationskarte 10 angeordnet, so dass die Lichteinwirkung sowohl von der Vorderseite als auch von der Rückseite der Karte her erfolgen kann. Grundsätzlich kann ein photochromes Foliensicherheitselement 20 jedoch auch in einem opaken Teilbereich eines Datenträgers angeordnet sein, wie weiter unten mit Bezug auf Fig. 4 erläutert.In the exemplary embodiment, the film security element 20 is arranged in a see-through region 18 of the identification card 10, so that the action of light can take place both from the front side and from the back side of the card. In principle, however, a photochromic film security element 20 can also be arranged in an opaque subarea of a data carrier, as described below with reference to FIG Fig. 4 explained.

Der Aufbau einer erfindungsgemäßen Identifikationskarte 10 und das Zustandekommen der beschriebenen selektiven Farbänderung werden nun mit Bezug auf die Figuren 2 und 3 näher erläutert. Dabei zeigt Fig. 2 die Identifikationskarte 10 zunächst im Ausgangzustand ohne Lichtbeaufschlagung, also bei normalen Betrachtungsbedingungen. Dabei stellt Fig. 2(a) einen Querschnitt der Karte entlang der Linie A-A der Fig. 1 dar und Fig. 2(b) zeigt schematisch das visuelle Erscheinungsbild des Foliensicherheitselements 20 in Aufsicht.The structure of an identification card 10 according to the invention and the realization of the described selective color change will now be described with reference to FIGS Figures 2 and 3 explained in more detail. It shows Fig. 2 the identification card 10 initially in the initial state without Lichtbeaufschlagung, ie under normal viewing conditions. It puts Fig. 2 (a) a cross section of the map along the line AA the Fig. 1 and Fig. 2 (b) schematically shows the visual appearance of the film security element 20 in supervision.

Der Schichtenfolge der Identifikationskarte 10 enthält in dieser Reihenfolge eine erste transparente Deckfolie 22, eine erste opake Folie 24, eine photochrome Folie 30, die das photochrome Foliensicherheitselement 20 bildet, eine zweite opake Folie 26 und eine zweite transparente Deckfolie 28. Die beiden opaken Folien 24, 26 sind in dem Durchsichtbereich 18 der Identifikationskarte 10 deckungsgleich ausgespart, so dass dort der Blick auf die photochrome Folie 30 freigegeben ist.The layer sequence of the identification card 10 contains in this order a first transparent cover film 22, a first opaque film 24, a photochromic film 30 forming the photochromic film security element 20, a second opaque film 26 and a second transparent cover film 28. The Both opaque films 24, 26 are recessed congruent in the see-through area 18 of the identification card 10, so that there the view of the photochromic film 30 is released.

Die photochrome Folie 30 enthält in einem Merkmalsbereich eine photochrome Substanz, die bei Lichteinwirkung eine reversible Zustandsänderung, insbesondere eine Farbänderung zeigt. Beispielsweise ist die photochrome Substanz im Ausgangszustand farblos transparent und geht bei Anregung durch UV-Bestrahlung reversibel in einen Zustand blauer Farbe über. Die Rückreaktion zu dem farblosen Zustand erfolgt spontan mit einer gewissen Zeitkonstante, kann aber auch durch Bestrahlung mit sichtbarem Licht beschleunigt werden.The photochromic film 30 contains in a feature region a photochromic substance which, upon exposure to light, exhibits a reversible state change, in particular a color change. For example, the photochromic substance is colorless transparent in the initial state and reversibly turns into a state of blue color upon excitation by UV irradiation. The back reaction to the colorless state occurs spontaneously with a certain time constant, but can also be accelerated by irradiation with visible light.

Um die Kennzeichnung 16 in der photochromen Folie 30 zu erzeugen, wurde die photochrome Substanz durch Einwirkung von Laserstrahlung in einem Kennzeichnungsbereich 32 deaktiviert, das heißt, die photochrome Substanz wurde so modifiziert, dass sie bei Beleuchtung keine Farbänderung mehr zeigt. Die Erfinder haben dabei festgestellt, dass es durch geeignete Abstimmung der Laserparameter auf die jeweils verwendete photochrome Substanz möglich ist, die photochromen Eigenschaften der photochromen Substanz abzuschwächen oder sogar vollständig zu deaktivieren, ohne dabei eine weitere, stets erkennbare Änderungen des visuellen Erscheinungsbilds zu bewirken. Der Kennzeichnungsbereich 32 mit der modifizierten (deaktivierten) photochromen Substanz ist daher ohne Lichteinwirkung nicht von dem umgebenden Bereich 34 mit der unmodifizierten photochromen Substanz zu unterscheiden. Bei normalen Betrachtungsbedingungen ohne Lichteinwirkung erscheint das Foliensicherheitselement 20 somit als strukturlose transparente Fläche 36, wie in Fig. 2(b) dargestellt.In order to generate the label 16 in the photochromic film 30, the photochromic substance was deactivated by the action of laser radiation in a marking region 32, that is, the photochromic substance was modified so that it no longer shows any color change on illumination. The inventors have found that it is possible by appropriate adjustment of the laser parameters on the photochromic substance used in each case to mitigate the photochromic properties of the photochromic substance or even completely disable, without causing a further, always recognizable changes in the visual appearance. The identification region 32 with the modified (deactivated) photochromic substance can therefore not be distinguished from the surrounding region 34 with the unmodified photochromic substance without the action of light. Under normal viewing conditions without the action of light, the film security element 20 thus appears as a structureless transparent surface 36, as in FIG Fig. 2 (b) shown.

Durch die Laserbeaufschlagung kann der modifizierte Kennzeichnungsbereich 32 ohne weiteres in Form von gewünschten Mustern, Zeichen oder Codierungen ausgebildet werden. Beispielsweise stellt der Kennzeichnungsbereich 32 im Ausführungsbeispiel eine Kopie des Portraits 14 des Karteninhabers dar.As a result of the laser application, the modified identification region 32 can easily be formed in the form of desired patterns, characters or codes. For example, the identification area 32 in the exemplary embodiment represents a copy of the portrait 14 of the cardholder.

Wird das photochrome Foliensicherheitselement 20 nun mit geeignetem Licht 42 einer Lichtquelle 40 beleuchtet, wie in Fig. 3 gezeigt, so zeigt die unmodifizierte photochrome Substanz im Bereich 34 die gewünschte Farbänderung, hier etwa von Farblos zu Blau, während die deaktivierte photochrome Substanz im Bereich 32 unverändert farblos transparent bleibt. Nach der Lichteinwirkung tritt daher bei Betrachtung des Foliensicherheitselements 20 das durch den Kennzeichnungsbereich 32 gebildete Portrait des Karteninhabers kontrastreich in Erscheinung, wie in Fig. 3(b) illustriert. Da das photochrome Portrait 32 eine Kopie des offenen Portraits 14 (Fig. 1) darstellt, kann es vom Betrachter leicht auf Übereinstimmung geprüft und somit für eine zusätzliche Echtheitsprüfung der Karte 10 eingesetzt werden.If the photochromic film security element 20 is then illuminated with suitable light 42 of a light source 40, as in FIG Fig. 3 The unmodified photochromic substance in region 34 shows the desired color change, in this case from colorless to blue, while the deactivated photochromic substance in region 32 remains unchanged colorlessly transparent. Therefore, after exposure to the light, when viewing the film security member 20, the portrait of the cardholder formed by the tagging portion 32 becomes rich in contrast, as in FIG Fig. 3 (b) illustrated. Since the photochromic portrait 32 has a copy of the open portrait 14 (FIG. Fig. 1 ), it can easily be checked for consistency by the viewer and thus used for an additional authenticity check of the card 10.

Je nach dem verwendetem photochromen Material und dessen Umfeld innerhalb des Folienmaterials kehrt das Sicherheitselement 20 mit einer gewissen Zeitkonstante spontan in den farblosen Zustand der Fig. 2(b) zurück oder kann durch eine weitere Bestrahlung mit Licht anderer Wellenlänge in den farblosen Zustand zurückgeführt werden. Die reversible Zustandsänderung kann durch erneute Beleuchtung beliebig oft ausgelöst werden.Depending on the photochromic material used and its environment within the film material, the security element 20 spontaneously returns to the colorless state with a certain time constant Fig. 2 (b) or may be returned to the colorless state by further irradiation with light of other wavelengths. The reversible change of state can be triggered as often as required by renewed lighting.

Figur 4 zeigt als weiteres Ausführungsbeispiel eine Identifikationskarte 50, bei der der Merkmalsbereich 38 des photochromen Foliensicherheitselements 20 in einem opaken Bereich der Identifikationskarte 50 angeordnet ist. Beispielsweise enthält die Schichtenfolge der Identifikationskarte 50 im relevanten Teilbereich eine erste transparente Deckfolie 22, eine durchgehende opake Folie 52, eine photochrome Folie 30, die das photochrome Foliensicherheitselement 20 bildet, und eine zweite transparente Deckfolie 28. FIG. 4 shows as another embodiment an identification card 50, wherein the feature area 38 of the photochromic film security element 20 is disposed in an opaque region of the identification card 50. For example, the layer sequence of the identification card 50 in the relevant subarea contains a first transparent cover film 22, a continuous opaque film 52, a photochrome film 30 forming the photochromic film security element 20, and a second transparent cover film 28.

Die photochrome Folie 30 enthält in dem Merkmalsbereich 38 eine photochrome Substanz, die durch Einwirkung von Laserstrahlung in einem motivförmigen Kennzeichnungsbereich 32 deaktiviert wurde, während sie in den Bereichen 34 außerhalb des Kennzeichnungsbereichs 32 unmodifiziert bleibt.The photochromic sheet 30 contains in the feature area 38 a photochromic substance which has been deactivated by the action of laser radiation in a motif-type marking area 32, while remaining unmodified in the areas 34 outside the marking area 32.

Bei Beleuchtung mit einer geeigneten Lichtquelle 40 zeigt die unmodifizierte photochrome Substanz dann im Bereich 34 die gewünschte Farbänderung, während die deaktivierte photochrome Substanz im Bereich 32 ihr Erscheinungsbild nicht verändert. Nach der Lichteinwirkung tritt daher das durch den Kennzeichnungsbereich 32 gebildete Motiv kontrastreich in Erscheinung und kann als Echtheitsabsicherung der Identifikationskarte 50 dienen.When illuminated with a suitable light source 40, the unmodified photochromic substance then shows the desired color change in region 34, while the deactivated photochromic substance in region 32 does not change its appearance. After exposure to light, therefore, the motif formed by the marking area 32 appears in high contrast and can serve as an authenticity assurance of the identification card 50.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Identifikationskarteidentification card
1212
Seriennummerserial number
1414
Portraitportrait
1616
verborgene Kennzeichnunghidden marking
1818
DurchsichtsbereichThrough area
2020
photochromes Foliensicherheitselementphotochromic film security element
22, 2822, 28
transparente Deckfolientransparent cover foils
24, 2624, 26
opake Folienopaque films
3030
photochrome Foliephotochromic film
3232
Kennzeichnungsbereichmarking area
3434
umgebender Bereichsurrounding area
3636
strukturlose transparente Flächestructureless transparent surface
3838
Merkmalsbereichfeature region
4040
Lichtquellelight source
4242
Lichtlight
5050
Identifikationskarteidentification card
5252
durchgehende opake Foliecontinuous opaque film

Claims (11)

  1. A data carrier (10) having a foil security element (20) that comprises, in a feature region (38), a photochromic substance whose photochromic properties are permanently modified in a sub-region (32) of the feature region by the action of electromagnetic radiation, characterized in that the modified sub-region (32) forms a hidden marking that, without the action of light on the foil security element (20), has substantially no contrast to the surrounding regions of the feature region (38), while the modified sub-region (32) stands out in contrast within the feature region (38) when light acts on the foil security element (20).
  2. The data carrier according to claim 1, characterized in that the feature region (38) is arranged in a see-through-region of the data carrier (10).
  3. The data carrier according to claim 1 or 2, characterized in that the modified sub-region (32) is developed in the form of patterns, characters or codes.
  4. The data carrier according to at least one of claims 1 to 3, characterized in that the data carrier (10) is multilayer and the foil security element (20) forms an inner layer of the multilayer data carrier.
  5. The data carrier according to claim 4, characterized in that an opaque layer of the data carrier (10) connects to one or both sides of the foil security element (20).
  6. The data carrier according to at least one of claims 1 to 5, characterized in that the data carrier (10) constitutes a value or security document, preferably is an identification card, especially an identity card, a data page for an identification document, a bank card, a credit card or a driver's license.
  7. The data carrier according to one of claims 1 to 6, characterized in that the photochromic properties of the photochromic substance in the said sub-region (32) are attenuated or deactivated by the action of electromagnetic radiation.
  8. A method for manufacturing a data carrier (10) having a foil security element (20), in which
    - a photochromic foil (30) is provided that comprises a photochromic substance in a feature region (38),
    - the photochromic foil (30) is applied to a data carrier (10) or is integrated into the interior of a data carrier (10), and
    - the photochromic properties of the photochromic substance are permanently modified in a sub-region (32) of the feature region (38) by the action of electromagnetic radiation, the modified sub-region (32) forming a hidden marking that, without the action of light on the foil security element (20), has substantially no contrast to the surrounding regions of the feature region, while the modified sub-region (32) stands out in contrast within the feature region (38) when light acts on the foil security element (20).
  9. The method according to claim 8, characterized in that the photochromic substance is modified by the action of laser radiation.
  10. The method according to claim 8 or 9, characterized in that the photochromic substance is modified only after the integration of the photochromic foil (30) into a multilayer data carrier (10).
  11. The method according to one of claims 8 to 10, characterized in that the photochromic properties of the photochromic substance in said sub-region (32) are attenuated or deactivated by the action of electromagnetic radiation.
EP17000082.2A 2016-01-19 2017-01-18 Data carrier with film security element Active EP3196044B1 (en)

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PL17000082T PL3196044T3 (en) 2016-01-19 2017-01-18 Data carrier with film security element

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Application Number Priority Date Filing Date Title
DE102016000428.2A DE102016000428A1 (en) 2016-01-19 2016-01-19 Disk with film security element

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EP3196044A1 EP3196044A1 (en) 2017-07-26
EP3196044B1 true EP3196044B1 (en) 2019-01-16

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Application Number Title Priority Date Filing Date
EP17000082.2A Active EP3196044B1 (en) 2016-01-19 2017-01-18 Data carrier with film security element

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PL (1) PL3196044T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3135917B1 (en) 2022-05-24 2024-04-12 Idemia France Method for manufacturing an identity document, identity document and method for authenticating such an identity document

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289547A (en) * 1991-12-06 1994-02-22 Ppg Industries, Inc. Authenticating method
DE19961841A1 (en) * 1999-12-21 2001-06-28 Joergen Brosow Fraud-proof data carrier useful for security, e.g. banknote or check, contains photochromic substance converted from one stable isomer to another by light, embedded in substrate transmitting conversion and read-out light
GB2430647B (en) 2005-09-29 2008-09-17 Rue De Int Ltd Security device for security substrates
DE102008005136A1 (en) * 2008-01-16 2009-07-23 U-Nica Technology Ag Document and method for producing a document
US8314828B2 (en) * 2009-10-18 2012-11-20 Gemalto Sa Personalization of physical media by selectively revealing and hiding pre-printed color pixels
DE102011010127A1 (en) * 2011-02-02 2012-08-02 Giesecke & Devrient Gmbh Authenticity assurance of value documents by means of photochromic dyes
US8385640B2 (en) * 2011-07-13 2013-02-26 Eastman Kodak Company System for controlling dynamic optical illusion images

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