EP2543521B1 - Document de sécurité et procédé de protection d'un document de sécurité contre la falsification et pour l'authentification du document de sécurité - Google Patents

Document de sécurité et procédé de protection d'un document de sécurité contre la falsification et pour l'authentification du document de sécurité Download PDF

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Publication number
EP2543521B1
EP2543521B1 EP11005575.3A EP11005575A EP2543521B1 EP 2543521 B1 EP2543521 B1 EP 2543521B1 EP 11005575 A EP11005575 A EP 11005575A EP 2543521 B1 EP2543521 B1 EP 2543521B1
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EP
European Patent Office
Prior art keywords
liquid
layer structure
crystal
crystal layer
security element
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.)
Not-in-force
Application number
EP11005575.3A
Other languages
German (de)
English (en)
Other versions
EP2543521A1 (fr
Inventor
Jérôme MARTIN
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.)
European Central Bank
Original Assignee
European Central Bank
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Filing date
Publication date
Application filed by European Central Bank filed Critical European Central Bank
Priority to EP11005575.3A priority Critical patent/EP2543521B1/fr
Priority to ES11005575.3T priority patent/ES2555061T3/es
Publication of EP2543521A1 publication Critical patent/EP2543521A1/fr
Application granted granted Critical
Publication of EP2543521B1 publication Critical patent/EP2543521B1/fr
Not-in-force legal-status Critical Current
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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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • 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
    • B42D25/346—Perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/391—Special inks absorbing or reflecting polarised light
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/128—Viewing devices

Definitions

  • the present invention relates to a security document comprising a substrate and an optical security element incorporated in the substrate and relates to a method for checking the authentication of the security document Moreover, the invention relates to a method for protecting a security document against forgery and for the authentication of the security document
  • security documents e.g. banknotes, credit cards, identity cards, tickets, stamps etc.
  • security elements have been developed to allow users and/or machines to discriminate between genuine and forged security documents, in particular banknotes, and/or to discriminate among different types of banknotes.
  • Special substrates, special inks, the inclusion of watermarks and security threads are commonly used for protecting security documents, in particular banknotes, against forgery.
  • Most of the security elements can be inspected with the naked eye.
  • Another type of security elements are not visible with the naked eye, but can be inspected with a special device. Examples of such security elements are optical security elements based on fluorescent and polarisation effects.
  • WO 98/52077 describes an optical security element based on a layer structure consisting of an orientation layer and a layer consisting of liquid-crystal monomers cross-linked with one another.
  • the orientation layer consists of a photo-arientable polymer network which is designated in literature as PPN or LPP layer.
  • the PPN or LLP layer defines in the oriented state regions of altemating orientations.
  • the liquid-crystal monomers are oriented through the interaction with the PNN layer in different zones. This orientation is fixed by a subsequent cross-linking step, after which a cross-linked, optical structured liquid-crystal (LCP) with a predetermined orientation pattern for storing information is formed. Under observation with the naked eye, the information which has been written in the LLP layer is not visible. Both layers have a transparent appearance. If the substrate on which the layers are located transmits light, then the stored Information becomes visible if the optical element is placed between two polariser sheets.
  • LCP optical structured liquid-crystal
  • optical liquid-crystal structure allows storing any kind of information in form of text and/or images for providing optical security elements which can be incorporated in security documents.
  • polarisers are necessary to make visible the information stored therein.
  • AU 2005 203 815 A1 discloses a security document having a plurality of PPN (photo-orientable polymer network) and LCP (liquid crystal polymer) layers. It also describes a polarizing layer which may be included in the security document. However, there is no disclosure regarding the arrangement of the LCP and PPN layers with respect to this polarizer.
  • WO 2007/137334 A1 discloses a similar security document having a plurality of PPN layers (14, 24) and LCP layers (16, 26).
  • Another object ofthe invention is providing a method for protecting a security document, in particular a banknote, against forgery and for the authentication of the security document, which simplifies the checking of the authentication of the security document.
  • the security document comprises a first liquid-crystal layer structure, a polariser, and a second liquid-aystal layer structure.
  • the liquid-crystal molecules of the first layer structure have a first predetermined orientation pattern for storing information, while the liquid-crystal molecules of the second layer structure have a second predetermined orientation pattern for storing information.
  • the information stored in the first and second liquid-crystal layer structures is not visible with the naked eye without an inspection tool.
  • Both the first information stored in the first liquid-crystal layer structure and the second information stored in the second liquid-crystal layer structure are independently visible for the public using an inspection tool.
  • the optical security element allow authentication of the security document by observing both the first and second information which can be a text or an image or a combination of text and image.
  • the method for checking the authentication of the optical security element according to the invention is based on the use of a liquid-crystal display as a means for providing polarised light.
  • Liquid-crystal displays emitting polarised light are well known. Since the screens of mobile telephones and cameras or other devices, e.g. a mobile TV, are liquid-crystal displays, mobile phones or cameras can be used by the public for making visible the stored information. Since the security document of the invention does not require a very special inspection tool, the inspection is simplified for the user.
  • the first information becomes visible when placing the optical security element of the security document on the liquid-crystal display in an orientation in which one of the sides of the optical security element is lying on the liquid-crystal display, while the second information becomes visible when placing the optical security element on the liquid-crystal display in an orientation in which the otherofthe sides of the optical security element is lying on the liquid-crystal display.
  • the first predetermined orientation pattern is different from the second predetermined orientation pattern so that the first and second information distinguish from each other.
  • the substrate of the security document comprises a cutout and the optical security element is located in the cutout of the substrate.
  • the optical security element can be placed on the upper or lower side of the substrate or can be incorporated in the substrate.
  • the optical security element is inserted into the substrate during the paper manufacturing process.
  • Each of the first and second liquid layer structures comprises an anisotropic layer comprising cross-linked liquid-crystal monomers and an orientation layer arranged on the anisotropic layer of the first and second liquid-crystal layer structure, respectively, so that the liquid-crystal molecules of the liquid-crystal layer structures align with the information stored in the orientation layer.
  • Both the orientation layers of the first and second liquid-crystal layer structures comprise a photo-oriented polymer network (PPN).
  • the optical security element of the invention is transparent under normal lighting conditions.
  • the security element can be combined with other security features having surface grating effects, in particular with holograms, diffractive optical elements (DOE) zero order gratings etc. These security features can be incorporated in an additional layer in the polariser between the first and second liquid-crystal layer structures.
  • DOE diffractive optical elements
  • Fig. 1 shows the front side of a banknote comprising an optical security element according to the invention.
  • the banknote comprises a substrate 1 made of a flexible material, e.g. the substrate is made of paper.
  • a graphical design printing 2 is provided on the front side and the backside of the banknote.
  • the banknote comprises conventional security elements, e.g. a security thread 3 made of a metal strip and a hologram 4.
  • the optical security element 5 of the banknote is a plastic band which has under normal lighting conditions a transparent appearance.
  • the plastic band of the optical security element 5 is located in a cutout 6 of the substrate 1 of the banknote.
  • the optical security element appears as a window in the banknote.
  • the information stored in the optical security element becomes visible for the public.
  • the plastic band of the optical security element is incorporated in the paper of the substrate during the paper manufacturing process.
  • a method for incorporating a plastic band in the paper of a banknote is described for example in AT 412 078 B .
  • Fig. 2 shows in a simplified schematic representation the layer structure of the optical security element.
  • the security element comprises a first liquid-crystal layer structure 7 and a second liquid-crystal layer structure 8 as well as polarizing sheet 9 arranged between the first and second liquid-crystal layer structures 7, 8.
  • the first liquid-crystal layer structure 7 comprises an anisotropic layer consisting of cross-linked liquid-crystal monomers 7A (LCP layer).
  • LCP layer cross-linked liquid-crystal monomers 7A
  • the orientation of the molecular arrangement of the LCP layer is predetermined by the orientation of an orientation layer 7B which adjoins the LCP layer 7A.
  • the orientation layer 7B is a photo-oriented polymer network (PPN) whose orientation varies locally over its surface. The orientation is determined by selective exposure to linearly polarized UV light.
  • PPN photo-oriented polymer network
  • This liquid-crystal layer structure allows storing of information, i.e. a first image in the preferred embodiment.
  • a method for producing the above liquid-crystal layer structure is described for example in EP-A 689 084 , WO 9953349 A1 , US-A 5 389 698 , and WO 98/52077 .
  • the second liquid-crystal layer structure 8 has the same structure as the first liquid-crystal layer structure 7.
  • Both layer structures 7, 8 are hybrid structures consisting of cross-linked liquid-crystal monomers 7A, 8A (LCP layer) and a photo-oriented polymer network (PPN) 7B, 8B.
  • the second liquid-crystal layer structure 8 stores a second image.
  • the directions of orientation of the first and second liquid-crystal layer structures 7, 8 include a right angle.
  • Fig. 3A to 3C illustrate the inspection of the optical security element.
  • the first and second liquid-crystal layer structures 7, 8 ( Fig. 2 ) showing the first and second images are designated with “1" and "2", respectively.
  • the first and second images are not visible for the public when observing both the upper side and the lower side of the banknote ( Fig. 3C ) and the optical security element is transparent. Under special lighting conditions, however, both images become visible.
  • the user does not need a very special tool rather than the screen (LCD) of a mobile phone or a camera for making visible the images.
  • LCD screen
  • the second image becomes visible when placing the optical security element of the banknote with its lower side on the screen (LCD) and observing the upper side of the banknote with the naked eye ( Fig. 3A ). Accordingly, the first image becomes visible when placing the optical security element with its upper side on the screen (LCD) and observing the lower side of the banknote with the naked eye ( Fig. 3B ).
  • the image is visible independent of the orientation of the optical security element on the screen. By rotating the security element on the screen, the image changes from positive to negative and vice versa.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Credit Cards Or The Like (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Claims (8)

  1. Procédé de vérification de l'authentification d'un document de sécurité présentant un substrat (1) et un élément de sécurité optique (5) incorporé dans le substrat, caractérisé en ce que l'élément de sécurité optique (5) présente :
    une première structure de couche de cristaux liquides (7), les molécules de cristaux liquides présentant un premier motif d'orientation prédéterminé pour mémoriser des informations,
    un polariseur (9), et
    une deuxième structure de couche de cristaux liquides (8), les molécules de cristaux liquides présentant un deuxième motif d'orientation prédéterminé pour mémoriser des informations,
    le polariseur (9) étant agencé entre la première et la deuxième structure de couche de cristaux liquides (7, 8),
    une découpe (6) dans le substrat, et l'élément de sécurité optique (5) étant agencé dans la découpe (6) du substrat,
    le procédé comprenant les étapes suivantes :
    fournissement d'un écran à cristaux liquides (LCD) pour émettre de la lumière polarisée,
    agencement de l'élément de sécurité optique (5) du document de sécurité sur l'écran à cristaux liquides (LCD) selon une orientation dans laquelle l'un des côtés de l'élément de sécurité optique (5) repose sur l'écran à cristaux liquides,
    observation de l'élément de sécurité optique (5) à l'oeil nu,
    agencement de l'élément de sécurité optique (5) sur l'écran à cristaux liquides (LCD) selon une orientation dans laquelle l'autre des côtés de l'élément de sécurité optique (5) repose sur l'écran à cristaux liquides, et
    observation de l'élément de sécurité optique (5) à l'oeil nu.
  2. Procédé selon la revendication 1, comprenant en outre les étapes suivantes :
    fournissement d'un téléphone portable ou d'une caméra présentant un écran à cristaux liquides pour transmettre de la lumière polarisée, l'élément de sécurité optique étant placé sur l'écran à cristaux liquides du téléphone mobile ou de la caméra.
  3. Procédé selon la revendication 1 ou 2, le premier motif d'orientation prédéterminé de la première structure de couche de cristaux liquides (7) étant différent du deuxième motif d'orientation prédéterminé de la deuxième structure de couche de cristaux liquides (8).
  4. Procédé selon la revendication 1 ou 2, la première structure de couche de cristaux liquides (7) et la deuxième structure de couche de cristaux liquides (8) présentant différents sens d'orientation.
  5. Procédé selon la revendication 4, les sens d'orientation de la première structure de couche de cristaux liquides (7) et de la deuxième structure de couche de cristaux liquides (8) incluant un angle droit.
  6. Procédé selon l'une des revendications précédentes, la première structure de couche de cristaux liquides (7) comprenant une couche anisotrope (7A) qui comporte des monomères de cristaux liquides réticulés, et la deuxième structure de couche de cristaux liquides (8) comprenant une couche anisotrope (8A) comportant des monomères de cristaux liquides réticulés.
  7. Procédé selon l'une des revendications précédentes, la première structure de couche de cristaux liquides (7) comprenant une couche d'orientation (7B) agencée sur la couche anisotrope (7A) de la première structure de couche de cristaux liquides, et la deuxième structure de couche de cristaux liquides (8) comprenant une deuxième couche d'orientation (8B) agencée sur la couche anisotrope (8A) de la deuxième structure de couche de cristaux liquides de sorte que les molécules de cristaux liquides de la première et de la deuxième structure de couche de cristaux liquides (7,8) s'alignent sur les informations mémorisées dans la couche d'orientation.
  8. Procédé selon la revendication 7, caractérisé en ce que la couche d'orientation (7B) de la première structure de couche de cristaux liquides (7) comporte un réseau polymère photo-orienté (PPN) et la couche d'orientation (8B) de la deuxième structure de couche de cristaux liquides (8) comporte un réseau polymère photo-orienté (PPN).
EP11005575.3A 2011-07-07 2011-07-07 Document de sécurité et procédé de protection d'un document de sécurité contre la falsification et pour l'authentification du document de sécurité Not-in-force EP2543521B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11005575.3A EP2543521B1 (fr) 2011-07-07 2011-07-07 Document de sécurité et procédé de protection d'un document de sécurité contre la falsification et pour l'authentification du document de sécurité
ES11005575.3T ES2555061T3 (es) 2011-07-07 2011-07-07 Documento de seguridad y método para proteger un documento de seguridad contra falsificación y para la autenticidad del documento de seguridad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11005575.3A EP2543521B1 (fr) 2011-07-07 2011-07-07 Document de sécurité et procédé de protection d'un document de sécurité contre la falsification et pour l'authentification du document de sécurité

Publications (2)

Publication Number Publication Date
EP2543521A1 EP2543521A1 (fr) 2013-01-09
EP2543521B1 true EP2543521B1 (fr) 2015-09-23

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EP11005575.3A Not-in-force EP2543521B1 (fr) 2011-07-07 2011-07-07 Document de sécurité et procédé de protection d'un document de sécurité contre la falsification et pour l'authentification du document de sécurité

Country Status (2)

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EP (1) EP2543521B1 (fr)
ES (1) ES2555061T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10800202B2 (en) 2015-07-10 2020-10-13 Universidad Politecnica De Madrid Method and device for document security by generating multiple reflective and transmissive latent images

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2015411341B2 (en) * 2015-10-08 2021-06-24 Alise Devices, S.L. Optical element and production method with multiple latent images for document security

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Publication number Priority date Publication date Assignee Title
DE4125270A1 (de) 1991-07-31 1993-02-04 Bayer Ag Chinolin-2-yl-methoxybenzylhydroxyharnstoffe
EP0689084B1 (fr) 1994-06-24 2003-06-04 Rolic AG Composant optique comprenant des couches en monomères liquides cristallins réticulés et procédé de sa production
EP2302425B1 (fr) 1997-05-09 2015-11-25 Rolic AG Elément optique
US6496287B1 (en) 1998-04-09 2002-12-17 Rolic Ag Optical identification element
AT412078B (de) 2002-04-08 2004-09-27 Oebs Gmbh Wertdokument
AU2005203815A1 (en) * 2004-01-12 2005-07-21 Securency International Pty Ltd Security document incorporating optical component
MX2008015239A (es) * 2006-05-31 2009-04-02 Securency Int Pty Ltd Documento de seguridad que incorpora componente optico.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10800202B2 (en) 2015-07-10 2020-10-13 Universidad Politecnica De Madrid Method and device for document security by generating multiple reflective and transmissive latent images

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Publication number Publication date
ES2555061T3 (es) 2015-12-28
EP2543521A1 (fr) 2013-01-09

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