EP3109060B1 - Element de securite et procede destines a la fabrication d'un element de securite - Google Patents

Element de securite et procede destines a la fabrication d'un element de securite Download PDF

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Publication number
EP3109060B1
EP3109060B1 EP15173371.4A EP15173371A EP3109060B1 EP 3109060 B1 EP3109060 B1 EP 3109060B1 EP 15173371 A EP15173371 A EP 15173371A EP 3109060 B1 EP3109060 B1 EP 3109060B1
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EP
European Patent Office
Prior art keywords
layer
luminescent layer
security element
luminescent
embossed
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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Application number
EP15173371.4A
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German (de)
English (en)
Other versions
EP3109060A1 (fr
Inventor
Sonja Landertshamer
Stephan Trassl
Klaus Schmidegg
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.)
Hueck Folien GmbH
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Hueck Folien GmbH
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Publication date
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Priority to EP15173371.4A priority Critical patent/EP3109060B1/fr
Publication of EP3109060A1 publication Critical patent/EP3109060A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—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
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light

Definitions

  • the invention relates to a security element and to a method for producing a security element, in which a flexible substrate is provided with a luminescent layer at least in regions and in a further step a diffraction structure is produced by embossing the luminescent layer in such a way that the luminescence intensity of the layer depends on the Viewing angle on this layer changed visually recognizable.
  • Multilayer security elements are known from the prior art ( WO2011 / 042010A1 . DE102010108170A1 ), which achieve a dependence of a luminescence intensity on the viewing angle by providing a layer with a diffraction structure on a luminescent layer.
  • such laminates have a high background luminescence, which disturbs the optical recognizability of the dependence of the luminescence intensity on the viewing angle and thus jeopardizes the security function of the security element. Therefore, narrow process parameters usually have to be followed in order to ensure comparatively high reproducibility in the production of the security element.
  • the security element can be produced comparatively quickly and procedurally in a simple manner.
  • a single applied layer can now be sufficient to allow both the optical radiation or luminescence and the diffraction structure for the angle-dependent change in the luminescence intensity.
  • the invention may be distinguished by the fact that the possibility of adjusting the background luminescence over the depth of the embossing or correspondingly minimizing it with the embossing of the luminescent layer in order to compensate for process fluctuations and manufacturing tolerances.
  • the inventive method can therefore reproducibly always ensure good visual recognition and thus high security against forgery of the security element.
  • the luminescent layer can be a liquid curable lacquer or even a thermoplastic material, which material can be provided with an embossed structure by forming with an embossing tool and by the action of pressure and / or temperature and / or electromagnetic radiation, for example UV radiation. This can also be, for example, a hot stamping process.
  • a luminescent layer can be any layer based on thermoplastic polymers such as PMMA, acrylates, PVC, PU or similar materials.
  • a luminescent layer may further consist of free-radically or cationically curable UV lacquers which are based inter alia on polyester, PU or acrylate binders.
  • a non-luminescent layer having a diffraction structure can additionally be applied to the substrate and embossed to produce the diffraction structure, wherein the embossing of the non-luminescent layer can optionally be effected separately or together with the luminescent layer.
  • the luminescent substances contained in the layer can be, for example, organic fluorescent dyes which emit light in the visible spectral range upon excitation with UV radiation.
  • a disadvantage of such materials is that they usually have a low light fastness, ie, the fluorescence intensity under continuous irradiation - such as sunlight - decreases rapidly.
  • Better light fastness can be achieved with inorganic, fluorescent pigments.
  • such pigments have high pigment sizes, whereby visible light is scattered on the pigments.
  • Such layers usually appear opaque to the viewer.
  • Nanocrystalline materials can combine the advantages of organic fluorescent dyes with the better lightfastness of pigments. Fluorescent nanoparticles based on compound semiconductors, which usually have particle sizes of 10-50 nm, have proven to be particularly suitable, whereby scattering of the visible light on the particles can be avoided.
  • nanoparticles consist of CdSe, PbS, ZnS, ZnO or other comparable materials.
  • the nanoparticles can be designed as core-shell particles.
  • the surface of the nanoparticles can be functionalized.
  • the process can be accelerated if the luminescent layer is applied to the substrate in a liquid or pasty manner, embossed and cured.
  • a liquid or pasty application preferably coating, can react extremely flexibly to changing process parameters, which can increase the reproducibility of the process. Furthermore, this application reproducibly produces a stable cohesive connection.
  • a diffraction structure following a tight manufacturing tolerance can be produced when the luminescent layer is cured during embossing.
  • the curing of the luminescent layer is thus comparatively easily controlled, which can benefit the reproducibility of the method.
  • the method can be further simplified if the luminescent layer is cured by radiation, in particular by UV radiation.
  • the flexible substrate is permeable to this radiation, whereby irradiation of the luminescent layer through the substrate can take place.
  • the embossing tool shadows the layer and thus uncontrollably influences the hardening of the layer, depending on the position.
  • the security against counterfeiting of the security element can be further improved.
  • the wavelengths of the luminescent colors and the size of the diffraction structures are tuned to each other, the color mixing ratio can be set advantageously for each viewing angle.
  • the process can be accelerated if a liquid paint is mixed with at least one luminescent substance and applied as a luminescent layer on the substrate.
  • a fluorescent varnish can not only be made comparatively easy, but also provide for a mechanically particularly stable cohesive connection with the flexible substrate, which can significantly increase the reproducibility of the process.
  • a continuous process may be enabled if the luminescent layer is embossed with a rotating embossing tool.
  • a nearly bump-free embossing of the layer can be ensured, which can greatly facilitate the process.
  • this cover layer may be a protective lacquer layer which is at least partially transparent to the luminescent color in order to be able to precisely follow not only the diffraction structure of the luminescent layer, but also to reduce the intensity of the luminescence as little as possible.
  • This cover layer can also be an adhesive layer in order to be able to provide the security element in a handling-friendly manner on a document of value.
  • Such an adhesive layer can be, for example, a pigmented or pigment-free heat-sealable, cold-seal or self-adhesive coating.
  • the adhesive layer may also be additionally applied to an existing protective lacquer layer.
  • a reflection layer can be applied beforehand. To form a reflection layer, a metal is conceivable.
  • the flexible substrate is peeled off the security element to provide a slim designed security element. This can be the case in particular after the security element has been laminated on a value document.
  • the luminescent layer can be applied to the flexible substrate in a roll coating process. This ensures a particularly high degree of homogeneity in the application of the luminescent layer. This may be particularly advantageous in the subsequent embossing step, since the roller application method increases the reproducibility of the method and at the same time ensures a more uniform impression of the embossed structure in the luminescent layer. A uniform impression of the embossed structure can in turn accelerate the process and increase the throughput, since the time required for complete molding of the embossed structures can be reduced.
  • the luminescent layer can be applied to a flexible substrate designed as a plastic film. This can be compared to the prior art, thinner and more flexible security element can be generated.
  • a plastic film a PET, PP, PC, PEN, PMMA, PVC or PE material may be suitable.
  • a transparent substrate with which the cohesive bonding with the luminescent layer can be facilitated.
  • the invention achieves the stated object with regard to the security element by the features of claim 10.
  • the luminescent layer has an embossing structure which forms the diffraction structure, both the change in the luminescence intensity dependent on the viewing angle and the luminescence itself can be structurally simply contained in a single layer and thus adjusted extremely precisely to one another.
  • the security element can be produced less expensively by the single-layer solution in order to create a diffraction structure which interacts with the luminescent layer to visually detectable change in the luminescence intensity as a function of the viewing angle on the luminescent layer.
  • the security element can be used to secure against forgery of a value document, in particular a banknote, a credit card, a passport, an identity card or the like.
  • the security element can be suitable for embedding in a value document in the form of a thread, in the form of a strip or in the form of a fabric.
  • the security element can have additional security features, such as diffractive layers, liquid-crystalline layers, layers with optical features, or layers with electrically conductive or magnetic features.
  • Layers with optical features may in this context be, for example, additional colored layers or luminescent layers.
  • the security against forgery of the security element can be further increased if the luminescent layer luminesces in at least two different colors.
  • the luminescent layer can have a change in the luminescence intensity which is dependent on the viewing angle for each luminescent color.
  • the viewing angle having the maximum luminescence intensity can here be determined by the wavelength of the respective luminescence color and the diffraction structure size.
  • the luminescent layer has a lacquer with a luminescent substance, homogeneous luminescence over the surface of the luminescent layer can be made possible.
  • a particularly accurate diffraction structure can be constructively and procedurally easily generated in a paint, which makes it possible to further improve the security against forgery of the security element.
  • the luminescent layer has a radiation-curing, preferably UV-crosslinking, lacquer.
  • a flexible substrate 2 is at least partially provided with a luminescent layer 3 and these are connected to one another cohesively.
  • a coating method 4 in which with a slot die a uniform layer 3 is generated or applied to the substrate 2.
  • this is also a roller application process conceivable.
  • this applied luminescent layer 3 is embossed by means of an embossing tool 5 in order to produce a diffraction structure 6.
  • a change in the luminescence intensity which can be visually recognized as a function of the viewing angle 10 on the layer 3 can be created - which is particularly evident in the US Pat Fig. 2 is shown.
  • light beams 7 emitted in the region of the diffraction structure 6 interfere with each other on exiting the diffraction structure 6. This interference leads to a weakening or amplification of the luminescence - depending on the exit angle 8.
  • This luminescence can be excited and generated by suitable radiation, preferably by UV radiation. If the security element 1 is illuminated with white light, in particular with light from the visible wavelength range, then the white light is split into its color components as a function of the angle, and the observer 9 can perceive different, reflected colors as a function of the viewing angle.
  • Fig. 1 in addition to the partially applied luminescent layer 3 also other layers 3 'can be applied in some areas. It would be conceivable in this context that, for example, non-luminescent layers or luminescent layers equipped with another luminescent color are applied. It is also conceivable that no layer 3 'is applied to the flexible substrate 2.
  • the security against forgery and recognizability of the security element 1 can accordingly be improved, since 8 different luminescent colors are perceived at different viewing angles.
  • a liquid, hardenable lacquer 12 with luminescent substances 13 is homogeneously mixed and this mixture 14 is applied to the flexible substrate 2.
  • luminescent substances 13 are added to the liquid paint 12 at different wavelengths.
  • the applied liquid paint 12 is embossed with an embossing tool 5 and activated in a further step, the curing process of the luminescent layer 3 and the varnish 12, whereby this polymerized and the diffraction structure 6 steadily preserved.
  • the activation of the curing process takes place during embossing with the embossing tool 5, since the embossed layer 3 can be more easily detached from the embossing tool 5 after at least partial polymerization. It is both conceivable that the polymerization after embossing is already completely completed, as well as that the liquid layer 3 has been pre-gelled or the curing process has been activated before embossing.
  • a radiation source 15 can be used for hardening the luminescent layer 3.
  • the use of UV radiation 16 has proven to be particularly simple and thus advantageous in this context. If a transparent substrate 2 is used, at least for the radiation 16, the irradiation of the luminescent layer 3 can take place through the substrate 2. This offers procedurally great advantages, since in this case the embossing tool 5 does not shade the radiation 16 and thus a more homogeneous and larger-area irradiation of the luminescent layer 3 is possible. It is also conceivable to provide additional radiation sources before and after the embossing step in order to carry out a pre or postpolymerization of the layer 3.
  • the curing by UV radiation 16 through the embossing tool 5 can take place.
  • the UV radiation source 15 could in this case be mounted in the middle of the embossing tool 5.
  • the application method 4 of the luminescent layer 3 shown as a slot die can be a roller application method.
  • Such a method can be distinguished, in particular, by the fact that very homogeneous layers can be produced therewith.
  • a homogeneous luminescent layer 3 is advantageous, in particular for the subsequent embossing step, because a more uniform impression of the embossed structure 20 is thereby possible.
  • the homogeneity of the luminescent layer 3 also has an effect on the contact time of the stamping tool 5 with the layer 3, since the time required for the impression of the stamping structure 20 is reduced and thus the throughput of the entire method can be increased.
  • the luminescent layer can be embossed with a rotating embossing tool 5.
  • the security element 1 can be moved continuously during production. This is particularly advantageous in roll-to-roll manufacturing processes where a continuous manufacturing process is desired.
  • a rotating embossing tool 5 has the advantage that successive embossings can be performed almost bum-free and make expensive alignment procedures of the embossing tool unnecessary.
  • the luminescent layer 3 can be applied, in particular, to a substrate 2 designed as a plastic film.
  • a substrate can in particular serve to improve the cohesive connection to the applied layer 3 and additionally provide good light transmission for the UV radiation 16 used for the curing.
  • a cover layer 17 is applied to the embossed luminescent layer 3 with a common application method 18.
  • This cover layer 17 is after Fig. 3 applied as a protective lacquer layer 19 on the luminescent layer 3.
  • this protective lacquer layer 19 must be transparent to the luminescent colors contained in the luminescent layer 3.
  • the light transmission is limited to certain subregions of the protective lacquer layer 19 in order to incorporate luminescent shapes or patterns in the security element and thus to further increase the security against counterfeiting.
  • an adhesive layer 23 applied to the security element 102 the opposite to the security element 101 after Fig. 3 is shown turned upside down.
  • the security element 102 can be adhesively bonded by means of the adhesive layer 23 to the value document 22 and in a further step the flexible substrate 2 away from the security element 102, in particular peeled off.
  • This process was in Fig. 4 indicated.
  • the removal of the flexible substrate 2 can be facilitated inter alia by the application of a Haftverminderers, in particular a release layer, between the flexible substrate 2 and luminescent layer 3, which is not shown in more detail in the figures.
  • the security element 1 has a luminescent layer 3, which in turn has a diffraction structure 6 for visually recognizable change in the luminescence intensity as a function of the viewing angle 10.
  • emitted light beams 7 interfere with similar light beams 7 depending on the exit angle 8 constructive or destructive. This leads to a viewing angle-dependent amplification or attenuation of the luminescence. This results in a tilting effect with respect to the luminescence for the viewer 9.
  • the diffraction structure 6 is designed as an embossed structure 20. This allows a procedurally simple and fast introduction of the diffraction structure 6 in the luminescent layer 3.
  • Fig. 3 shows by way of example a security element 101 with an embossing depth 21 of the embossed structure 20, which does not completely penetrate the luminescent layer 3.
  • all security elements 1, 101, 102 have a flexible substrate 2 on which the luminescent layer 3 is applied. This can be of great advantage, in particular when handling the security element in the method steps, and considerably simplify this. However, if necessary, the flexible substrate 2 can be removed again from the luminescent layer 3 in a further step.
  • the luminescent layer 3 has at least two different luminescent colors.
  • Each luminescent color has its own viewing angle dependence of the luminescence intensity. This viewing angle dependence follows from the interference condition as a function of the respective luminescence wavelength and the diffraction pattern size 11. By overlaying all the luminescent colors, a color play which is dependent on the viewing angle 10 results, in which each viewing angle 10 can be assigned a unique mixed color.
  • the embossing structure 20 according to the invention is designed in such a way that it penetrates the luminescent layer 3.
  • the embossing depth 21 corresponds to the thickness of the luminescent layer 3. This may prove to be advantageous because it minimizes the background luminescence and the detectability of the change in the luminescence intensity can be improved. This in turn is conducive to the security against forgery of the security element.
  • a security element 101 not according to the invention is shown, in which the embossed structure 20 does not completely penetrate the luminescent layer 3, ie the embossing depth 21 is smaller than the thickness of the luminescent layer 3.
  • the embossed structure 20 does not completely penetrate the luminescent layer 3, ie the embossing depth 21 is smaller than the thickness of the luminescent layer 3.
  • the in the Fig. 2a and 2b shown luminescent layers 3, are designed in one embodiment as a radiation-curing, in particular UV-crosslinking paint. This is particularly advantageous from a procedural point of view since such a lacquer layer 3 can be easily embossed and polymerized or hardened by UV radiation 16 in order to produce an embossed structure 6 (cf. Fig. 1 ).
  • a cover layer 17 is applied to the embossed structure 20.
  • This cover layer 17 is designed in particular as a transparent, radiation-curing protective lacquer layer 19.
  • the applied covering layer 17 must be transparent to the luminescent colors and to the exciting radiation.
  • Such a cover layer 17 can improve the life of the security element 1 and its resistance to external influences. It is thus possible, for example, to protect the luminescent layer 3 from oxidation caused by UV radiation.
  • the embossed structure 20 has a metallic reflection layer 24 in regions.
  • This reflection layer 24 is applied directly to the embossed structure 20 of the luminescent layer 3 and preferably has a homogeneous thickness.
  • a security element 102 is shown which is provided with an adhesive layer 23 on the side opposite the flexible substrate 2.
  • the adhesive layer 23 is applied directly to the luminescent layer 3 or to the reflection layer 24 applied to the luminescent layer 3.
  • the security element 102 is at the same time adhesively connected via the adhesive layer 23 to a value document 22, the flexible substrate 2 having been detached from the security element 102 after the security element 102 has been connected to the value document 22.
  • the adhesive layer 23 may in this case be designed in particular as a self-adhesive coating.
  • a top view of the security elements 1, 101, 102 is shown, wherein the two-dimensional embossed structure 20 is shown in the form of circles.
  • the circles thus include areas of the luminescent layer 3, while outside of the circles no luminescent layer 3 is present and thus a view of the value document 22 is released.
  • the periodicity 25 of the embossed structure 20 differs in the longitudinal direction 26 of the periodicity 27 of the embossing pattern 20 in the transverse direction 28. This difference causes the interference condition for the amplification or extinction of the emitted light in these two directions 26, 28 to also be different. So you tilt a security element 1 according to Fig. 5 along the tilting directions 26 and 28 shown, this results in different optical effects. This mechanism again significantly increases the security against forgery of the security feature 1 according to the invention.

Claims (15)

  1. Procédé de fabrication d'un élément de sécurité dans lequel un substrat souple (2) est doté sur au moins certaines parties d'une couche luminescente (3) et une structure de diffraction (6) est créée dans une étape suivante par estampage de la couche luminescente (3) de telle manière que l'intensité de luminescence de la couche (3) change de façon visible en fonction de l'angle de vue (10) sur ladite couche (3), caractérisé en ce que la couche luminescente (3) est estampée de part en part pour créer la structure de diffraction (6).
  2. Procédé selon la revendication 1, caractérisé en ce que la couche luminescente (3) est appliquée, estampée et durcie sur le substrat (2) à l'état liquide ou pâteux.
  3. Procédé selon la revendication 2, caractérisé en ce que la couche luminescente (3) est durcie pendant l'estampage.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce que la couche luminescente (3) est durcie par rayonnement (16), plus particulièrement par rayonnement UV (16).
  5. Procédé selon une des revendications 1 à 4, caractérisé en ce qu'une couche luminescente (3) en au moins deux couleurs différentes est appliquée sur le substrat souple (2).
  6. Procédé selon une des revendications 1 à 5, caractérisé en ce qu'un vernis liquide (12) est mélangé avec au moins une substance luminescente (13) et appliqué comme couche luminescente (3) sur le substrat (2).
  7. Procédé selon une des revendications 1 à 6, caractérisé en ce que la couche luminescente (3) est estampée à l'aide d'un outil d'estampage rotatif (5).
  8. Procédé selon une des revendications 1 à 7, caractérisé en ce qu'une couche de revêtement (17) est appliquée sur la couche luminescente estampée (3), plus particulièrement une couche de vernis protectrice (19) au moins par endroits translucide et laissant transparaître la couleur de luminescence et/ou une couche de colle (23), avec une couche réfléchissante (24) éventuellement appliquée auparavant.
  9. Procédé selon une des revendications 1 à 8, caractérisé en ce que le substrat souple (2) est retiré de l'élément de sécurité (1, 101, 102).
  10. Élément de sécurité comportant une couche luminescente (3) et une structure de diffraction (6) de la couche luminescente (3) obtenue par estampage qui, par interaction avec la couche luminescente (3), permet de faire changer l'intensité de luminescence de façon visible en fonction de l'angle de vue (10) sur la couche luminescente (3), caractérisé en ce que la couche luminescente (3) possède une structure estampée (20) traversant la couche luminescente (3) qui forme la structure de diffraction (6).
  11. Élément de sécurité selon la revendication 10, caractérisé en ce que la couche luminescente (3) produit une luminescence en au moins deux couleurs différentes.
  12. Élément de sécurité selon la revendication 10 ou 11, caractérisé en ce que la couche luminescente (3) comporte un vernis (12), plus particulièrement un vernis durcissable par rayonnement, préférablement réticulant aux UV, avec une substance luminescente (13).
  13. Élément de sécurité selon une des revendications 10 à 12, caractérisé en ce que l'élément de sécurité (1, 101, 102) comporte une couche de revêtement (17), plus particulièrement une couche de vernis protectrice (19), au moins par endroits translucide et laissant transparaître la couleur de luminescence et/ou une couche de colle (23), éventuellement sur une couche réfléchissante (24), la dite couche de revêtement (17) recouvrant la structure estampée (20).
  14. Élément de sécurité selon une des revendications 10 à 13, caractérisé en ce que l'élément de sécurité (1, 101, 102) comporte un substrat souple (2), sur lequel est prévue la couche luminescente (3).
  15. Document de valeur, plus particulièrement billet de banque, passeport, permis de conduire ou carte d'identité comportant au moins un élément de sécurité (1, 101, 102) selon une des revendications 10 à 14.
EP15173371.4A 2015-06-23 2015-06-23 Element de securite et procede destines a la fabrication d'un element de securite Active EP3109060B1 (fr)

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EP15173371.4A EP3109060B1 (fr) 2015-06-23 2015-06-23 Element de securite et procede destines a la fabrication d'un element de securite

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EP15173371.4A EP3109060B1 (fr) 2015-06-23 2015-06-23 Element de securite et procede destines a la fabrication d'un element de securite

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EP3109060A1 EP3109060A1 (fr) 2016-12-28
EP3109060B1 true EP3109060B1 (fr) 2018-08-15

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Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
GB0326576D0 (en) * 2003-11-14 2003-12-17 Printetch Ltd Printing composition
BRPI0610706B8 (pt) * 2005-05-18 2021-06-22 Nanoventions Holdings Llc sistema de imagem ótica sintética, dispositivo de segurança de documentos, sistema de apresentação de imagem e dispositivo de segurança ou sistema de autenticação
BRPI0719110A2 (pt) * 2006-11-21 2013-12-10 Ciba Holding Inc Aparelho e método para fabricação de um produto de segurança
DE102007007029A1 (de) 2007-02-08 2008-08-14 Bundesdruckerei Gmbh Sicherheits- und/oder Wertdokument mit photonischem Kristall
CA2656506A1 (fr) * 2009-02-27 2010-08-27 Bank Of Canada Dispositif de verification des caracteristiques de securite
DE102009048870B3 (de) 2009-10-09 2011-02-24 Zahedi Fariborz Martin Loessl Sicherheitselement zur Echtheitserkennung
DE102012108170B4 (de) 2012-09-03 2015-01-22 Bundesdruckerei Gmbh Sicherheitselement und Verfahren zur Herstellung eines Sicherheitselements
GB201317195D0 (en) * 2013-09-27 2013-11-13 Rue De Int Ltd Method of manufacturing a pattern and apparatus therefor

Non-Patent Citations (1)

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Title
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