EP2094502B1 - Élément de sécurité comportant des couches de cristaux liquides - Google Patents

Élément de sécurité comportant des couches de cristaux liquides Download PDF

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Publication number
EP2094502B1
EP2094502B1 EP07846489.8A EP07846489A EP2094502B1 EP 2094502 B1 EP2094502 B1 EP 2094502B1 EP 07846489 A EP07846489 A EP 07846489A EP 2094502 B1 EP2094502 B1 EP 2094502B1
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EP
European Patent Office
Prior art keywords
liquid crystal
layers
layer
security element
viewing direction
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
EP07846489.8A
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German (de)
English (en)
Other versions
EP2094502A2 (fr
Inventor
Winfried HOFFMÜLLER
Theodor Burchard
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.)
Giesecke and Devrient GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP2094502A2 publication Critical patent/EP2094502A2/fr
Application granted granted Critical
Publication of EP2094502B1 publication Critical patent/EP2094502B1/fr
Active 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
    • B42D25/20—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
    • B42D25/36—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
    • 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D2033/26—

Definitions

  • the invention relates to a security element (see DE 10 2004 039355 ) for security papers, value documents and the like having two superposed layers of cholesteric liquid crystalline material each selectively reflecting light from a first, longer wavelength spectral range in a first viewing direction perpendicular to its surface and a second viewing direction at an angle to the normal to its Surface selectively reflect light from a second, shorter wavelength spectral range.
  • Valuables such as branded goods or documents of value, are often provided with security elements for the purpose of protection, which allow verification of the authenticity of the object of value and at the same time serve as protection against unauthorized reproduction.
  • security elements for the purpose of protection, which allow verification of the authenticity of the object of value and at the same time serve as protection against unauthorized reproduction.
  • the special properties of liquid-crystalline materials are exploited for this purpose, and above all the viewing angle-dependent color impression of liquid crystal layers, which is referred to below as the color-shift effect.
  • the color shift effect of a single liquid crystal layer always results in a shift of the reflected light wavelength from a longer wavelength region to a shorter wavelength region due to the physical situation when the liquid crystal layer is tilted out of the perpendicular viewing direction.
  • the document describes EP 0 720 753 B1 a colored material having two superimposed chiral liquid crystal polymer sheets, wherein a leaflet when viewed infrared light perpendicular to its surface and red light when viewed at an angle to the normal to its surface.
  • the second leaflet when viewed perpendicular to its surface, reflects blue light and, when viewed at an angle to the normal to its surface, reflects ultraviolet light.
  • the layer arrangement If such a layer arrangement is viewed perpendicular to its main surface, it appears blue, since the first leaflet reflects infrared light and therefore appears transparent. In oblique view, the layer arrangement appears red, however, because then the second leaflet reflects ultraviolet light and therefore appears transparent. Overall, the layer arrangement therefore exhibits a color-shift effect from blue to red which is inverse to normal liquid-crystal layers.
  • the object of the invention is to avoid the disadvantages of the prior art and, in particular, to specify a security element of the type mentioned at the outset with a conspicuous visual tilt effect and high counterfeit security.
  • the inventive coordination of the color shift effects of the liquid crystal layers on the dependence of the sensitivity of the human eye on the wavelength of light allows a surprising and visually spectacular tilting effect:
  • the motif to be displayed appears for a viewer with bright green a clearly contrasting background. If the observer tilts the security element out of the vertical in an oblique viewing direction, the motif disappears and the image impression appears to be a uniform green surface without any recognizable contrast differences.
  • the green spectral range encompasses all wavelengths which produce a substantially green color impression in the viewer.
  • the first layer is formed so that it in the first viewing direction light from the wavelength range between 490 nm and 590 nm, more preferably between 520 nm and 570 nm.
  • the second layer is preferably designed such that it reflects light in the second viewing direction from the wavelength range between 490 nm and 590 nm, particularly preferably between 520 nm and 570 nm.
  • the first layer is designed such that it reflects light from the blue or ultraviolet spectral range in the second viewing direction.
  • the second layer advantageously reflects light from the red or infrared spectral range in the first viewing direction.
  • the two layers are expediently arranged on a carrier, wherein in a first variant of the invention the first layer is arranged below the second layer.
  • the sequence of the two liquid crystal layers plays no role for the effect according to the invention, so that alternatively the first layer can also be arranged above the second layer.
  • the support preferably contains a light-absorbing background.
  • the support may contain a dark, for example, black background, or, in order to be able to influence the color impression of the liquid crystal layers in a targeted manner, also a light-absorbing colored background.
  • a support with a light-diffractive background, in particular with a diffractive black background, is also considered, as the color effect of the liquid crystals is also emphasized by such a background.
  • At least one of the two liquid-crystalline layers is applied over the whole area as a film coating and optionally structured in the form of a motif.
  • at least one of the two liquid-crystalline layers is formed by printing liquid crystal pigments embedded in a binder matrix.
  • the security element contains at least one further security feature, in particular a layer with magnetic, electrically conductive, phosphorescent, fluorescent or other luminescent feature substances or a polarizing or phase-shifting layer.
  • the further layer can be arranged above, below or between the two layers of liquid-crystalline material.
  • security elements according to the invention are not limited to designs with two liquid crystal layers, but rather that additional liquid crystal layers may be provided to achieve additional effects or effects.
  • the invention further comprises a data carrier, in particular a value document, such as a banknote, an identity card or the like, which is equipped with a security element of the type described.
  • a data carrier in particular a value document, such as a banknote, an identity card or the like, which is equipped with a security element of the type described.
  • the second layer is designed such that it reflects light from the blue or ultraviolet spectral range in the second viewing direction.
  • the first layer reflects into the first viewing direction with advantage light from the red or infrared spectral range.
  • the second layer reflects light from the green spectral region in the first viewing direction
  • the first image can not be seen in plan view (first viewing direction)
  • the first layer reflects light from the red or infrared spectral region into the first viewing direction reflected first viewing direction and the human eye is much more sensitive to green light. It thus appears to the viewer in the first viewing direction, a uniform green area without apparent contrast differences, while tilting the security element from the vertical in an oblique viewing direction, the green motif to be displayed against a contrasting blue background appears.
  • the effect of the invention is based on the coordination of the color shift effects of the two liquid crystal layers on each other and on the spectral sensitivity of the human eye, which will be explained in more detail below.
  • Fig. 1 shows a schematic representation of a banknote 10, which is provided with a security element 12 according to the invention, which has a conspicuous visual tilting effect.
  • the security element 12 shows a high-contrast green motif against a red background, which, when tilting the security element from the vertical, merges into a monochrome green area without any recognizable contrast differences.
  • the security element 12 has an absorbing, in particular black background 20 and two layers 22, 24, arranged on the black background 20, of cholesteric liquid-crystalline material.
  • the first liquid crystal layer 22 is in the form of the desired motif, for example of the in Fig. 3 (b) shown coat of arms motif, applied.
  • the second liquid crystal layer 24 is arranged over the entire surface of the first liquid crystal layer 22 in the exemplary embodiment.
  • the second liquid crystal layer may itself also be in the form of a motif as long as it provides only a background for the motif of the first liquid crystal layer.
  • the liquid crystal layers 22, 24 may first be applied over the whole area as a film coating, wherein at least the first liquid crystal layer 22 after application is patterned by known methods in the form of the motif to be displayed.
  • the liquid crystal layers may also be formed by printing liquid crystal pigments embedded in a binder matrix.
  • alignment layers may be provided between the background 20 and the first liquid crystal layer 22 and / or between the two liquid crystal layers 22 and 24.
  • the security element is not necessarily produced by directly applying the layers to a suitable data medium. Rather, it is also possible to use a so-called transfer method in which z. B. at least the two liquid crystal layers on a suitable substrate, for. As a film applied, then provided the outer layer with an adhesive layer and using the adhesive layer, the two layers on an absorbent Background be applied to a disk. Subsequently, the film is peeled off and the security element is arranged on a data carrier with the layer sequence shown in the figures.
  • transfer methods are known to the person skilled in the art with which a data carrier according to the invention can be obtained.
  • the cholesteric liquid crystal layers 22, 24 each have a defined color shift effect, thus each reflect light in a first viewing direction perpendicular to its surface light from a first, longer wavelength spectral range, and reflect in a second viewing direction at an angle to the perpendicular to its surface selectively light from a second, shorter wavelength spectral range.
  • the effect according to the invention is based on the coordination of the color shift effects of the two liquid crystal layers on one another and on the spectral sensitivity of the human eye. It is exploited that cholesteric liquid crystal layers reflect circularly polarized light in the relevant spectral range with a reflectance of up to 50%. In the longer wavelength range, the bands become wider and the height of the reflection maximum decreases slightly. Overall, however, the amount of light reflected in the optical range remains approximately the same.
  • the human eye has a pronounced sensitivity maximum in the green spectral range.
  • V ( ⁇ ) of the eye of a normal observer as determined by the International Commission on Illumination (CIE)
  • the light-adapted eye has a sensitivity maximum at a wavelength of 555 nm.
  • the sensitivity of the eye is already only 10% of the maximum sensitivity and decreases further towards the edges of the visible spectral range.
  • the sensitivity curve V '( ⁇ ) is shifted slightly to the blue, where the sensitivity maximum lies at 507 nm.
  • the second liquid crystal layer 24 is designed in such a way that it has a color shift effect from red to green, ie in the first viewing direction perpendicular to its surface selectively light 30 from the red spectral region (FIG. R in Fig. 2 and selectively reflecting light 32 from the green spectral range (G) in a second viewing direction at an angle to the normal to its surface.
  • the green spectral range encompasses all wavelengths which produce an essentially green color impression in an average viewer, in particular the wavelength range between 490 nm and 590 nm, and particularly preferably between 520 nm and 570 nm.
  • the first liquid crystal layer 22 applied as a pattern is formed to have a color shift effect from green to blue, that is, light 34 from the green spectral range (G) perpendicular to its surface and a second viewing direction at an angle in the first viewing direction to the perpendicular to its surface selectively reflects light 36 from the blue spectral region (B).
  • the security element 12 With a vertical view of the security element 12 results in a total of a high-contrast image impression for the viewer, as based on the FIGS. 2 and 3 (a) illustrated.
  • the overall color impression 40 is determined solely by the red light 30 reflected by the second liquid crystal layer 24 in the first viewing direction, so that the background 50 of the security element 12 appears red.
  • the overall color impression 42 results from the superposition of the red light 30 reflected from the second liquid crystal layer 24 and the green light 34 reflected from the first liquid crystal layer 22. From the green light comparison For the viewer, the green color impression of the first liquid crystal layer 22 is dominated by the significantly higher spectral sensitivity of the human eye to red light, so that the interior of the coat of arms motif 52 appears in bright, glowing green.
  • the overall color impression 44 is again only by the green reflected by the second liquid crystal layer 24 in the viewing direction
  • Light 32 determines that background 54 of security element 12 will appear green when viewed obliquely.
  • the overall color impression 46 results from the superposition of the green light 32 reflected by the second liquid crystal layer 24 and the blue light 36 reflected from the first liquid crystal layer 22 Compared to blue light significantly higher spectral sensitivity of the human eye dominates for the viewer the green color impression of the second liquid crystal layer 24, so that the inside of the coat of arms motif 56 likewise appears green.
  • both the area of the coat of arms motif 56 and the background area 54 thus appear green, so that the image motif disappears for lack of contrast for the viewer.
  • the tilted security element 12 presents itself to the viewer as a uniform green area, as in Fig. 4 (b) illustrated.
  • a layer 64 of cholesteric liquid-crystalline material is initially printed on an absorbent colored background 66, which, like the second liquid-crystal layer of the exemplary embodiment of FIGS. 2 to 4 , has a color shift effect from red to green.
  • a further layer 62 of cholesteric liquid-crystalline material in the form of the motif to be displayed is then printed.
  • the further layer 62 has, as the first liquid crystal layer of the embodiment of FIGS. 2 to 4 , a color-shift effect of Green to blue.
  • the illustrated motif also highlights in contrast with this security element in supervision and disappears when tilting the security element.
  • the color impression can be influenced in a top view and in an oblique view.
  • liquid crystal layers described can be combined with further layers which serve, for example, the protection of the security element or one of its partial layers, improved alignment or adhesion of the layers or a further increase in the security against counterfeiting.
  • a security element 70 according to a further embodiment of the invention, in which on a diffractive black background 72, a magnetic feature substance 74 in the form of another motif, such as a machine-readable barcode applied.
  • a layer sequence of two superimposed liquid crystal layers 22, 24 is then provided, as in the embodiment of Fig. 2 described.
  • alignment layers may also be provided below the first and / or second liquid crystal layer to facilitate or enhance alignment of the liquid crystalline material.
  • the first liquid crystal layer has a color shift effect of z. B. red (first viewing direction, top view) to green (second viewing direction) and the second liquid crystal layer a color shift effect of green (first viewing direction) after z. B. blue (second viewing direction) have.
  • results in a vertical view of the security element is a substantially uniform green area without apparent contrast differences, while the viewer recognizes the green motif against a blue background from an oblique viewing direction. In other words, the subject can only be recognized at an oblique angle when viewing the security element.
  • all statements made for the claimed variants of the description apply mutatis mutandis. This also applies to the representation of the claimed variants in the FIGS. 1 to 6 ,

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Credit Cards Or The Like (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)

Claims (15)

  1. Elément de sécurité pour papiers de sécurité, documents de valeur et analogues, comportant deux couches (22, 24) disposées l'une au-dessus de l'autre, en un matériau cristal liquide cholestérique, dont chacune réfléchit sélectivement, dans une première direction d'observation, normale à sa surface, une lumière appartenant à un premier domaine spectral à plus grande longueur d'onde, et réfléchit sélectivement, dans une deuxième direction d'observation, selon un certain angle par rapport à la normale à sa surface, une lumière appartenant à un deuxième domaine spectral à longueur d'onde plus courte,
    caractérisé en ce que
    - une première des deux couches (22) se présente sous forme d'un motif à représenter et réfléchit dans la première direction d'observation une lumière appartenant au domaine spectral vert, et que
    - la deuxième des deux couches (24) réfléchit une lumière appartenant au domaine spectral vert dans la deuxième direction d'observation.
  2. Elément de sécurité selon la revendication 1, caractérisé en ce que la première, couche (22) réfléchit dans la première direction d'observation une lumière appartenant au domaine de longueurs d'onde compris entre 490 et 590 nm, de préférence entre 520 et 570 nm, et/ou que la deuxième couche (24) réfléchit dans la deuxième direction d'observation une lumière appartenant au domaine de longueurs d'onde compris entre 490 et 590 nm, de préférence entre 520 et 570 nm.
  3. Elément de sécurité selon au moins l'une des revendications 1 à 2, caractérisé en ce que la première couche (22) réfléchit dans la deuxième direction d'observation une lumière appartenant au domaine spectral bleu ou ultraviolet, et/ou que la deuxième couche (24) réfléchit dans la première direction d'observation une lumière appartenant au domaine spectral rouge ou infrarouge.
  4. Elément de sécurité selon au moins l'une des revendications 1 à 3, caractérisé en ce que les deux couches (22, 24) sont disposées sur un support, et la première couche (22) est disposée en-dessous ou au-dessus de la deuxième couche (24).
  5. Elément de sécurité selon la revendication 4, caractérisé en ce que le support contient un fond (20) absorbant la lumière, de préférence foncé, en particulier noir, ou un fond (20) coloré, absorbant la lumière.
  6. Elément de sécurité selon la revendication 4, caractérisé en ce que le support contient un fond diffractant la lumière, en particulier un fond noir (20) diffractif.
  7. Elément de sécurité selon au moins l'une des revendications 1 à 6, caractérisé en ce qu'au moins l'une des deux couches en un cristal liquide (22, 24) est appliquée en pleine surface en tant que revêtement en film et éventuellement est structurée sous forme d'un motif, ou qu'au moins l'une des deux couches en un cristal liquide est formée par surimpression de pigments cristaux liquides incorporés dans une matrice liante.
  8. Elément de sécurité selon au moins l'une des revendications 1 à 7, caractérisé en ce que l'élément de sécurité contient au moins une caractéristique de sécurité supplémentaire, en particulier une couche comportant des substances caractéristiques (74) magnétiques, conductrices de l'électricité, phosphorescentes, fluorescentes ou autrement luminescentes, ou contient une couche polarisante ou de déphasage, la couche supplémentaire étant de préférence disposée au-dessus ou en-dessous des deux couches en un matériau cristal liquide, ou entre ces dernières.
  9. Elément de sécurité selon au moins l'une des revendications 1 à 8, caractérisé en ce qu'une couche d'alignement est disposée entre les deux couches (22, 24) en un matériau cristal liquide.
  10. Procédé de fabrication d'un élément de sécurité pour papiers de sécurité, documents de valeur et analogues, dans lequel deux couches (22, 24) en un matériau cristal liquide cholestérique sont disposées l'une au-dessus de l'autre, qui chacune réfléchit sélectivement, dans une première direction d'orientation, normale à sa surface, une lumière appartenant à un premier domaine spectral à plus grande longueur d'onde, et, dans une deuxième direction d'orientation, selon un certain angle avec la normale à sa surface, une lumière appartenant à un deuxième domaine spectral à longueur d'onde plus courte,
    caractérisé en ce que
    - on produit une première des deux couches (22) sous forme d'un motif à représenter, et on la configure de façon qu'elle réfléchisse dans la première direction d'orientation une lumière appartenant au domaine spectral vert, et que
    - on configure la deuxième des deux couches (24) de façon qu'elle réfléchisse la lumière appartenant au domaine spectral vert dans la deuxième direction d'observation.
  11. Procédé selon la revendication 10, caractérisé en ce que les deux couches (22, 24) sont disposées sur un support, et la première couche est disposée en-dessous ou au-dessus de la deuxième couche.
  12. Procédé selon au moins l'une des revendications 10 à 11, caractérisé en ce qu'au moins l'une des deux couches en un cristal liquide (22, 24) est appliquée en pleine surface en tant que revêtement en film et éventuellement est structurée sous forme d'un motif, ou qu'au moins l'une des deux couches en un cristal liquide est formée par surimpression de pigments cristaux liquides incorporés dans une matrice liante.
  13. Procédé selon au moins l'une des revendications 10 à 12, caractérisé en ce que l'élément de sécurité est combiné à au moins une caractéristique de sécurité supplémentaire, en particulier à une couche comportant des substances caractéristiques (74) magnétiques, conductrices de l'électricité, phosphorescentes, fluorescentes ou autrement luminescentes, ou une couche polarisante ou de déphasage, la couche supplémentaire étant de préférence disposée au-dessus ou au-dessous des deux couches en un matériau cristal liquide, ou entre ces dernières.
  14. Procédé selon au moins l'une des revendications 10 à 13, caractérisé en ce qu'une couche d'alignement est disposée entre les deux couches (22, 24) en un matériau cristal liquide.
  15. Support de données (10), en particulier document de valeur, tel que billet de banque, carte d'identité ou analogues, qui comprend un élément de sécurité (12) selon au moins l'une des revendications 1 à 9 et un élément de sécurité fabriqué selon au moins l'une des revendications 10 à 14.
EP07846489.8A 2006-10-19 2007-10-04 Élément de sécurité comportant des couches de cristaux liquides Active EP2094502B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006049951A DE102006049951A1 (de) 2006-10-19 2006-10-19 Sicherheitselement für Flüssigkristallschichten
PCT/EP2007/008584 WO2008046515A2 (fr) 2006-10-19 2007-10-04 Élément de sécurité comportant des couches de cristaux liquides

Publications (2)

Publication Number Publication Date
EP2094502A2 EP2094502A2 (fr) 2009-09-02
EP2094502B1 true EP2094502B1 (fr) 2013-07-31

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EP07846489.8A Active EP2094502B1 (fr) 2006-10-19 2007-10-04 Élément de sécurité comportant des couches de cristaux liquides

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Country Link
EP (1) EP2094502B1 (fr)
CN (1) CN101528473B (fr)
DE (1) DE102006049951A1 (fr)
WO (2) WO2008046515A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102529215B (zh) * 2011-12-29 2014-12-03 中钞油墨有限公司 层状液晶复合材料及其制备方法和应用
EP2778212B1 (fr) 2013-03-15 2016-01-20 OpSec Security Group, Inc. Dispositif de sécurité utilisant des cristaux liquides
AT516128B1 (de) * 2014-07-17 2018-05-15 Hueck Folien Gmbh Sicherheitselement mit Farbkippeffekt und Manipulationsnachweis

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000065383A1 (fr) * 1999-04-21 2000-11-02 Nippon Mitsubishi Oil Corporation Stratifie optique
JP2003231380A (ja) * 2002-02-12 2003-08-19 Nhk Spring Co Ltd 対象物の識別媒体及び識別方法
JP4392826B2 (ja) * 2003-05-16 2010-01-06 日本発條株式会社 対象物の識別媒体及び識別方法
JP2005022292A (ja) * 2003-07-03 2005-01-27 Nippon Oil Corp 対象物の識別構造およびその構造が設けられた対象物
DE102004021247A1 (de) * 2004-04-30 2005-11-24 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102004039355A1 (de) * 2004-08-12 2006-02-23 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102004021246A1 (de) * 2004-04-30 2005-11-24 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung

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Publication number Publication date
WO2008046537A2 (fr) 2008-04-24
DE102006049951A1 (de) 2008-04-24
EP2094502A2 (fr) 2009-09-02
WO2008046515A2 (fr) 2008-04-24
CN101528473A (zh) 2009-09-09
CN101528473B (zh) 2011-06-08
WO2008046515A3 (fr) 2008-06-12

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