EP0493268A1 - Tamper-proof laminated document, and method of fabrication of such a document - Google Patents

Tamper-proof laminated document, and method of fabrication of such a document Download PDF

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Publication number
EP0493268A1
EP0493268A1 EP91403562A EP91403562A EP0493268A1 EP 0493268 A1 EP0493268 A1 EP 0493268A1 EP 91403562 A EP91403562 A EP 91403562A EP 91403562 A EP91403562 A EP 91403562A EP 0493268 A1 EP0493268 A1 EP 0493268A1
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EP
European Patent Office
Prior art keywords
hologram
information
layer
support
laminated
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.)
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EP91403562A
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German (de)
French (fr)
Inventor
Hugues Souparis
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Surys SA
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Hologram Industries SAS
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Publication date
Application filed by Hologram Industries SAS filed Critical Hologram Industries SAS
Publication of EP0493268A1 publication Critical patent/EP0493268A1/en
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    • 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
    • B42D25/328—Diffraction gratings; Holograms

Definitions

  • Holographic films are now commonly affixed to numerous documents (credit cards, passports, banknotes, etc.) which they make very difficult to counterfeit. They include the recording of an interference figure which it is impossible to reproduce without having the original matrix. They are therefore in themselves tamper-proof.
  • known techniques have been associated with holography (hot-stamping films, methods for producing security stickers, etc.) for affixing holograms on these documents.
  • a hologram stamped on a document or an object.
  • the hologram is then perfectly secured to its support and cannot be dissociated from it without deterioration.
  • the object of the invention is to make this type of falsification impossible.
  • EP-A-0 201 323 discloses a hologram of transparent type making it possible to forge certain documents. However, it does not describe a way to make a stamped document unforgeable.
  • the hologram is fixed on the face of the marking area carrying the intaglio information and it comprises an adhesive layer ensuring the fixing of the hologram on the marking area.
  • the hologram of the unforgeable document includes an index layer bearing the figure of holographic interference.
  • This layer is preferably associated with a layer of varnish and can be covered with a protective layer of plastic.
  • a marking area 2 of a support 1 is deformed on one of its faces 2a the information 3 forms the reliefs 3a while on the other face 2b this same information forms hollows 3b.
  • This support can itself be laminated and carry other information recorded by different means (printed information, magnetic information, etc.).
  • the information 3 is generally readable by observation of the face of the card 2a on which the information forms reliefs.
  • a hologram 4 is fixed on the face 2b of the support 2 in which the recording of the information has formed hollows 3b using a layer of adhesive 5.
  • the process for manufacturing a laminated tamper-evident document of the type described above comprises a first phase according to which the information 3 is recorded on the support. This registration is generally done by embossing, hot or cold.
  • the carrier layer of the holographic interference figure can be either a transparent layer 6 called the index layer because its refractive index is different from at least one of the layers with which it is in contact.
  • It can also be a metallized layer (most often of aluminum) also deformed by stamping.
  • the stamping can be carried out directly on the index layer or on the metallization layer 6; according to another manufacturing process, the hologram comprises a layer of varnish 7. This layer is stamped and then covered with the index layer or the metallization which then adopt the shape of the surface of the stamped varnish layer.
  • This protective layer 8 can for example be a plastic material of the polyvinyl chloride or polyester type. It can also help to ensure the flatness of the hologram.
  • the hologram is preferably covered with an additional layer of protective varnish 10.
  • the detachment layer 9 which has the effect that any attempt to modify the information leads to a very apparent destruction of the hologram 4.
  • Such a wax-based layer is known in itself. It does not reduce the resistance, for example the abrasion resistance of the hologram 4 during normal use of the card but will produce the detachment of the protective layer 8 during an attempt to modify the information 3 recorded.

Abstract

The invention relates to the protection of documents against tampering. It relates more particularly to a tamper-proof laminated document comprising a support (1) having a marked zone (2) with two sides (2a and 2b) carrying information (3b) which forms reliefs (3a) on one of its sides (2a) and indentations (3b) on its other side (2b) and comprising a hologram (4) bearing an image formed by holographic interferences, covering at least part of the marked zone (2). The hologram (4) is attached to the side (2b) of the marked zone (2) bearing the information that forms the indentations. An adhesive layer (5) fixes the hologram (4) to the marked zone (2). <IMAGE>

Description

L'invention concerne les documents de sécurité tels que les cartes d'identité, passeports, billets de banque, cartes de crédit etc... qui sont fabriqués ou traités de manière à être rendus infalsifiables et être authentifiés.The invention relates to security documents such as identity cards, passports, banknotes, credit cards, etc. which are manufactured or processed in such a way as to be tamper-proof and to be authenticated.

Les films holographiques sont maintenant couramment apposés sur de nombreux documents (cartes de crédit, passeports, billets de banque, ...) qu'ils rendent très difficiles à contrefaire. Ils comportent l'enregistrement d'une figure d'interférence qu'il est impossible de reproduire sans disposer de la matrice originale. Ils sont donc en eux-mêmes infalsifiables. Par ailleurs, des techniques connues ont été associées à l'holographie (films de marquage à chaud, méthodes de réalisation d'autocollants sécuritaires, ...) pour réaliser l'apposition des hologrammes sur ces documents.Holographic films are now commonly affixed to numerous documents (credit cards, passports, banknotes, etc.) which they make very difficult to counterfeit. They include the recording of an interference figure which it is impossible to reproduce without having the original matrix. They are therefore in themselves tamper-proof. In addition, known techniques have been associated with holography (hot-stamping films, methods for producing security stickers, etc.) for affixing holograms on these documents.

On peut par exemple transférer à chaud un hologramme, estampé sur un document ou un objet. L'hologramme est alors parfaitement solidaire de son support et ne peut en être dissocié sans détérioration. On peut également estamper les hologrammes sur des films très fragiles quine permettent pas de déplacer les hologrammes sans qu'ils soient détruits.We can for example heat transfer a hologram, stamped on a document or an object. The hologram is then perfectly secured to its support and cannot be dissociated from it without deterioration. We can also stamp the holograms on very fragile films which do not allow the holograms to be moved without being destroyed.

Certains documents tels que par exemple les cartes de crédit portent des informations en relief dont la protection présente des difficultés particulières.Certain documents such as, for example, credit cards carry information in relief, the protection of which presents particular difficulties.

En effet, un certain nombre de falsifications ont été constatées par désembossage des cartes, cette opération faisant disparaître les informations initiales et réembossage de manière à enregistrer de nouvelles informations.Indeed, a certain number of falsifications were noted by embossing of the cards, this operation removing the initial information and re-embossing so as to record new information.

Le but de l'invention est de rendre impossible ce type de falsification.The object of the invention is to make this type of falsification impossible.

On connaît de EP-A-0 201 323 un hologramme de type transparent permettant de rendre infalsifiable certains documents. Il n'y est cependant pas décrit une manière de rendre infalsifiable un document estampé.EP-A-0 201 323 discloses a hologram of transparent type making it possible to forge certain documents. However, it does not describe a way to make a stamped document unforgeable.

FR-A-2 621 863 décrit la protection d'une carte bancaire par l'application d'un hologramme en forme de bandeau sur la ligne numérique au recto de la carte, cet hologramme étant déposé par transfert à chaud avant estampage de la carte.FR-A-2 621 863 describes the protection of a bank card by the application of a band-shaped hologram on the digital line on the front of the card, this hologram being deposited by hot transfer before stamping of the card .

Cette solution présente plusieurs inconvénients, notamment du fait qu'un estampage après transfert à chaud de l'hologramme peut endommager ce dernier. En outre la détection d'une falsification éventuelle est délicate car elle demande une manipulation de la carte devant une source de lumière et n'est pas immédiate. Enfin, l'hologramme étant situé sur la zone de marquage de la carte, il n'est pas possible d'en faire un support publicitaire ou décoratif suffisant. La présente invention a pour but d'obvier à ces inconvénients.This solution has several disadvantages, in particular the fact that stamping after hot transfer of the hologram can damage the latter. In addition, the detection of a possible forgery is delicate because it requires manipulation of the card in front of a light source and is not immediate. Finally, the hologram being located on the marking area of the card, it is not possible to make it a sufficient advertising or decorative medium. The object of the present invention is to overcome these drawbacks.

A cet effet l'invention concerne un document stratifié infalsifiable comportant un support ayant une zone de marquage ayant deux faces, portant des informations formant des reliefs sur l'une de ses faces et des creux sur l'autre de ses faces et comportant un hologramme recouvrant au moins partiellement la zone de marquage.To this end, the invention relates to a forgery-resistant laminated document comprising a support having a marking area having two sides, carrying information forming reliefs on one of its faces and recesses on the other of its faces and comprising a hologram at least partially covering the marking area.

Selon l'invention l'hologramme est fixé sur la face de la zone de marquage portant les informations en creux et il comporte une couche adhésive assurant la fixation de l'hologramme sur la zone de marquage.According to the invention, the hologram is fixed on the face of the marking area carrying the intaglio information and it comprises an adhesive layer ensuring the fixing of the hologram on the marking area.

Selon un mode de réalisation préféré l'hologramme du document infalsifiable comporte une couche d'indice portant la figure d'interférences holographiques.According to a preferred embodiment, the hologram of the unforgeable document includes an index layer bearing the figure of holographic interference.

Cette couche est préférentiellement associée à une couche de vernis et peut être recouverte d'une couche de protection en matière plastique.This layer is preferably associated with a layer of varnish and can be covered with a protective layer of plastic.

L'invention concerne également un procédé de fabrication d'un document infalsifiable stratifié comportant un support ayant une zone de marquage ayant deux faces portant des informations formant des reliefs sur l'une de ses faces et des creux sur l'autre de ses faces et comportant un hologramme porteur d'une figure d'interférence holographique selon l'invention :

  • on enregistre les informations sur le support
  • on fixe ensuite l'hologramme sur la face du support sur laquelle les informations forment des creux à l'aide d'une couche d'adhésif.
The invention also relates to a method of manufacturing a laminated unforgeable document comprising a support having a marking area having two faces carrying information forming reliefs on one of its faces and indentations on the other of its faces and comprising a hologram carrying a holographic interference figure according to the invention:
  • we save the information on the support
  • the hologram is then fixed on the face of the support on which the information forms hollows using a layer of adhesive.

L'invention sera décrite plus en détail en référence aux dessins dans lesquels :

  • la figure 1 est une représentation de face d'une carte de crédit conforme à l'invention
  • la figure 2 est une vue en coupe partielle A - A de la carte de crédit représentée sur la figure 1 dans un premier mode de réalisation
  • la figure 3 est une vue en coupe partielle A - A de la carte de crédit représentée sur la figure 1 selon un deuxième mode de réalisation.
The invention will be described in more detail with reference to the drawings in which:
  • Figure 1 is a front view of a credit card according to the invention
  • Figure 2 is a partial sectional view A - A of the credit card shown in Figure 1 in a first embodiment
  • Figure 3 is a partial sectional view A - A of the credit card shown in Figure 1 according to a second embodiment.

Les cartes de crédit comportent des éléments d'information en relief.Credit cards have embossed pieces of information.

Ils sont généralement enregistrés sur un support 1 par matriçage, embossage ou estampage.They are generally recorded on a support 1 by stamping, embossing or stamping.

Plus précisément par un tel procédé une zone de marquage 2 d'un support 1 est déformée sur l'une de ses faces 2a les informations 3 forment les reliefs 3a alors que sur l'autre face 2b ces mêmes informations forment des creux 3b.More precisely by such a method a marking area 2 of a support 1 is deformed on one of its faces 2a the information 3 forms the reliefs 3a while on the other face 2b this same information forms hollows 3b.

Différents matériaux peuvent être utilisés pour constituer le support 1. Généralement des matières synthétique dites matières plastiques sont utilisées pour le réaliser. Ce support peut lui-même être stratifié et porter d'autres informations enregistrées par des moyens différents (informations imprimées, informations magnétiques ...).Different materials can be used to form the support 1. Generally synthetic materials called plastics are used to make it. This support can itself be laminated and carry other information recorded by different means (printed information, magnetic information, etc.).

Les informations 3 sont généralement lisibles par observation de la face de la carte 2a sur laquelle les informations forment des reliefs.The information 3 is generally readable by observation of the face of the card 2a on which the information forms reliefs.

Un hologramme 4 est fixé sur la face 2b du support 2 dans laquelle l'enregistrement des informations a formé des creux 3b à l'aide d'une couche d'adhésif 5.A hologram 4 is fixed on the face 2b of the support 2 in which the recording of the information has formed hollows 3b using a layer of adhesive 5.

Ainsi, par cette disposition, toute tentative de désembossage de la carte qui conduirait à l'élimination des reliefs 3a sur la face 2a, suivi d'une opération de réembossage nécessaire pour donner à la carte un aspect classique induirait une déformation de l'hologramme 4 produisant sa destruction irréversible.Thus, by this arrangement, any attempt to de-emboss the card which would lead to the elimination of the reliefs 3a on the face 2a, followed by a re-embossing operation necessary to give the card a classic appearance would induce a deformation of the hologram 4 producing its irreversible destruction.

Ainsi, de manière surprenante cette disposition de l'hologramme sur la carte de crédit augmente considérablement sa fiabilité et permet d'éviter une forme particulière de falsification.Thus, surprisingly, this arrangement of the hologram on the credit card considerably increases its reliability and makes it possible to avoid a particular form of forgery.

Le procédé de fabrication d'un document infalsifiable stratifié du type décrit plus haut comporte une première phase selon laquelle on enregistre les informations 3 sur le support. Cet enregistrement est généralement fait par embossage, à chaud ou à froid.The process for manufacturing a laminated tamper-evident document of the type described above comprises a first phase according to which the information 3 is recorded on the support. This registration is generally done by embossing, hot or cold.

Ensuite et donc seulement après que les informations 3 aient été enregistrées l'hologramme 4 est fixé sur la face 2b du support 1 sur laquelle les informations préalablement enregistrées forment des creux 3b.Then and therefore only after the information 3 has been recorded, the hologram 4 is fixed on the face 2b of the support 1 on which the previously recorded information forms hollows 3b.

Cette fixation est réalisée à l'aide d'une couche d'adhésif.This fixing is carried out using a layer of adhesive.

Différents types d'hologrammes 4 peuvent être utilisés pour la réalisation du document infalsifiable.Different types of holograms 4 can be used for the production of the tamper-proof document.

On appelle ici hologramme un objet généralement constitué de plusieurs couches dont l'une porte une figure d'interférences holographiques.Here we call a hologram an object generally made up of several layers, one of which bears a holographic interference pattern.

La couche porteuse de la figure d'interférences holographiques peut être soit une couche transparente 6 dite couche d'indice car son indice de réfraction est différent de l'une au moins des couches avec lesquelles elle est en contact.The carrier layer of the holographic interference figure can be either a transparent layer 6 called the index layer because its refractive index is different from at least one of the layers with which it is in contact.

Ainsi des déformations produites par matriçage sur cette couche d'indice permet la réalisation d'un hologramme dit hologramme estampé.Thus deformations produced by stamping on this index layer allows the production of a hologram called stamped hologram.

Il peut également s'agir d'une couche métallisée (le plus souvent d'aluminium) également déformée par estampage.It can also be a metallized layer (most often of aluminum) also deformed by stamping.

L'estampage peut être réalisé directement sur la couche d'indice ou sur la couche de métallisation 6 ; selon un autre procédé de fabrication l'hologramme comporte une couche de vernis 7. Cette couche est estampée puis recouverte de la couche d'indice ou de la métallisation qui adoptent alors la forme de la surface de la couche de vernis matricée.The stamping can be carried out directly on the index layer or on the metallization layer 6; according to another manufacturing process, the hologram comprises a layer of varnish 7. This layer is stamped and then covered with the index layer or the metallization which then adopt the shape of the surface of the stamped varnish layer.

Afin d'améliorer la résistance de l'hologramme 4 lors d'un usage normal de la carte de crédit celui-ci est avantageusement recouvert d'une couche protectrice 8 en matière plastique. Cette couche protectrice 8 peut par exemple être une matière plastique de type polychlorure de vinyle ou polyester. Elle peut également contribuer à assurer la planéité de l'hologramme.In order to improve the resistance of the hologram 4 during normal use of the credit card, it is advantageously covered with a protective layer 8 of plastic. This protective layer 8 can for example be a plastic material of the polyvinyl chloride or polyester type. It can also help to ensure the flatness of the hologram.

Lorsque cette couche de protection 8 n'est pas à la surface du document, l'hologramme est de préférence recouvert d'une couche complémentaire de vernis de protection 10.When this protective layer 8 is not on the surface of the document, the hologram is preferably covered with an additional layer of protective varnish 10.

Le document infalsifiable décrit plus haut est d'excellente qualité et les tests qui ont été réalisés ne permettent pas d'imaginer de quelle manière des éléments d'information 3 initialement enregistrés pourraient être modifiés ou substitués par d'autres éléments d'information par des faussaires.The forgery-proof document described above is of excellent quality and the tests which have been carried out do not make it possible to imagine how elements of information 3 initially recorded could be modified or replaced by other elements of information by counterfeiters.

Toutefois il peut être jugé utile d'introduire dans l'hologramme 4 une couche dite couche de détachement 9 qui a pour effet que toute tentative de modifications des informations entraîne une destruction très apparente de l'hologramme 4.However, it may be considered useful to introduce into the hologram 4 a layer called the detachment layer 9 which has the effect that any attempt to modify the information leads to a very apparent destruction of the hologram 4.

Cette couche de détachement 8 est généralement placée entre la couche de vernis et la couche de protection.This release layer 8 is generally placed between the varnish layer and the protective layer.

Une telle couche, à base de cire est connue en elle-même. Elle ne diminue pas la résistance, par exemple la résistance à l'abrasion de l'hologramme 4 lors d'un usage normal de la carte mais produira le détachement de la couche protectrice 8 lors d'une tentative de modification des informations 3 enregistrées.Such a wax-based layer is known in itself. It does not reduce the resistance, for example the abrasion resistance of the hologram 4 during normal use of the card but will produce the detachment of the protective layer 8 during an attempt to modify the information 3 recorded.

Claims (9)

Document infalsifiable stratifié comportant un support (1) ayant une zone de marquage (2) ayant deux faces (2a et 2b) portant des informations (3b) formant des reliefs (3a) sur l'une de ses faces (2a) et des creux (3b) sur l'autre de ses faces (2b) et comportant un hologramme (4) porteur d'une figure d'interférences holographiques, recouvrant au moins partiellement la zone de marquage (2) caractérisé en ce que l'hologramme (4) est fixé sur la face (2b) de la zone de marquage (2) portant les informations formant des creux, et qu'il comporte une couche d'adhésif (5) assurant la fixation de l'hologramme 4 sur la zone de marquage (2).Falsifiable laminated document comprising a support (1) having a marking area (2) having two faces (2a and 2b) carrying information (3b) forming reliefs (3a) on one of its faces (2a) and recesses (3b) on the other of its faces (2b) and comprising a hologram (4) carrying a holographic interference pattern, at least partially covering the marking area (2) characterized in that the hologram (4 ) is fixed on the face (2b) of the marking area (2) carrying the information forming recesses, and that it comprises a layer of adhesive (5) ensuring the fixing of the hologram 4 on the marking area (2). Document infalsifiable stratifié selon la revendication 1 caractérisé en ce que le support (1) est en matière plastique.Falsifiable laminated document according to claim 1 characterized in that the support (1) is made of plastic. Document infalsifiable stratifié selon la revendication 2 caractérisé en ce que les informations (3) sont enregistrées sur le support (1) par estampage.Falsifiable laminated document according to claim 2 characterized in that the information (3) is recorded on the support (1) by stamping. Document infalsifiable stratifié selon l'une quelconque des revendications 1 à 3 caractérisé en ce que l'hologramme (4) comporte une couche d'indice (6) portant la figure d'interférence holographique.An unforgeable laminated document according to any one of claims 1 to 3 characterized in that the hologram (4) comprises an index layer (6) carrying the holographic interference figure. Document infalsifiable stratifié selon l'une quelconque des revendications 1 à 3 caractérisé en ce que l'hologramme (4) comporte une couche métallisée portant la figure d'interférence holographique.Falsifiable laminated document according to any one of claims 1 to 3 characterized in that the hologram (4) comprises a metallized layer carrying the holographic interference figure. Document infalsifiable stratifié selon l'une quelconque des revendications 4 ou 5 caractérisé en ce que l'hologramme (4) comporte une couche de vernis (7).Falsifiable laminated document according to any one of claims 4 or 5 characterized in that the hologram (4) comprises a layer of varnish (7). Document infalsifiable stratifié selon l'une quelconque des revendications 4 à 6 caractérisé en ce que l'hologramme (4) comporte une couche de protection (8) en matière plastique.A laminated unforgeable document according to any one of claims 4 to 6, characterized in that the hologram (4) comprises a protective layer (8) made of plastic. Document infalsifiable stratifié selon l'une quelconque des revendications 4 à 8 caractérisé en ce que l'hologramme (4) comporte une couche de détachement (9).Falsifiable laminated document according to any one of claims 4 to 8 characterized in that the hologram (4) comprises a release layer (9). Procédé de fabrication d'un document infalsifiable stratifié comportant un support (1) ayant une zone de marquage (2) ayant deux faces (2a et 2b) portant des informations (3) formant des reliefs (3a) sur l'une de ses faces (2a) et des creux (3b) sur l'autre de ses faces (2b) et comportant un hologramme (4) porteur d'une figure d'interférence holographique caractérisé en ce que : - on enregistre les informations (3) sur le support (1) - on fixe ensuite l'hologramme (4) sur la face (2b) du support sur laquelle les informations forment des creux à l'aide d'une couche d'adhésif. Method for manufacturing a laminated unforgeable document comprising a support (1) having a marking area (2) having two faces (2a and 2b) carrying information (3) forming reliefs (3a) on one of its faces (2a) and hollows (3b) on the other of its faces (2b) and comprising a hologram (4) carrying a holographic interference figure characterized in that: - the information (3) is recorded on the support (1) - The hologram (4) is then fixed on the face (2b) of the support on which the information forms hollows using a layer of adhesive.
EP91403562A 1990-12-28 1991-12-27 Tamper-proof laminated document, and method of fabrication of such a document Withdrawn EP0493268A1 (en)

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Application Number Priority Date Filing Date Title
FR9016460 1990-12-28
FR9016460A FR2671032A1 (en) 1990-12-28 1990-12-28 INFALSIFIABLE DOCUMENT LAMINATED WITH HOLOGRAM AND METHOD FOR MANUFACTURING SUCH A DOCUMENT.

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EP0493268A1 true EP0493268A1 (en) 1992-07-01

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259049A (en) * 1991-08-12 1993-03-03 Landis & Gyr Betriebs Ag Identification card with machine-readable optically encoded information in diffraction structures
WO1995021747A1 (en) * 1994-02-14 1995-08-17 Commonwealth Scientific And Industrial Research Organisation Diffractive device with enhanced anti-copying protection
US5825547A (en) * 1993-08-06 1998-10-20 Commonwealth Scientific And Industrial Research Organisation Diffractive device for generating one or more diffracting images including a surface relief structure at least partly arranged in a series of tracks
US5912767A (en) * 1993-11-23 1999-06-15 Commonwealth Scientific And Industrial Research Organisation Diffractive indicia for a surface
US6737154B2 (en) 1995-06-26 2004-05-18 3M Innovative Properties Company Multilayer polymer film with additional coatings or layers

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EP0145481A2 (en) * 1983-12-12 1985-06-19 E.I. Du Pont De Nemours And Company Improved holographic image transfer process
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FR2621863A1 (en) * 1987-10-16 1989-04-21 Oberthur Card Systems Francois BANK CARD PROTECTED AGAINST FRAUD
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EP0145481A2 (en) * 1983-12-12 1985-06-19 E.I. Du Pont De Nemours And Company Improved holographic image transfer process
EP0201323B1 (en) * 1985-05-07 1994-08-17 Dai Nippon Insatsu Kabushiki Kaisha Article incorporating a transparent hologramm
GB2181993A (en) * 1985-10-31 1987-05-07 Bpcc Holographic Security Syst Method and means for preventing counterfeiting of documents
FR2621863A1 (en) * 1987-10-16 1989-04-21 Oberthur Card Systems Francois BANK CARD PROTECTED AGAINST FRAUD

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259049A (en) * 1991-08-12 1993-03-03 Landis & Gyr Betriebs Ag Identification card with machine-readable optically encoded information in diffraction structures
GB2259049B (en) * 1991-08-12 1995-09-27 Landis & Gyr Betriebs Ag Identification card production.
US5825547A (en) * 1993-08-06 1998-10-20 Commonwealth Scientific And Industrial Research Organisation Diffractive device for generating one or more diffracting images including a surface relief structure at least partly arranged in a series of tracks
US5912767A (en) * 1993-11-23 1999-06-15 Commonwealth Scientific And Industrial Research Organisation Diffractive indicia for a surface
WO1995021747A1 (en) * 1994-02-14 1995-08-17 Commonwealth Scientific And Industrial Research Organisation Diffractive device with enhanced anti-copying protection
US6737154B2 (en) 1995-06-26 2004-05-18 3M Innovative Properties Company Multilayer polymer film with additional coatings or layers

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