EP1972463A2 - Elément de sécurité - Google Patents

Elément de sécurité Download PDF

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Publication number
EP1972463A2
EP1972463A2 EP08004395A EP08004395A EP1972463A2 EP 1972463 A2 EP1972463 A2 EP 1972463A2 EP 08004395 A EP08004395 A EP 08004395A EP 08004395 A EP08004395 A EP 08004395A EP 1972463 A2 EP1972463 A2 EP 1972463A2
Authority
EP
European Patent Office
Prior art keywords
security
security element
feature area
feature
element according
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.)
Granted
Application number
EP08004395A
Other languages
German (de)
English (en)
Other versions
EP1972463A3 (fr
EP1972463B1 (fr
Inventor
Christoph Dr. Mengel
Thorsten Dr. Pillo
Winfried Dr. Hoffmüller
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
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Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP1972463A2 publication Critical patent/EP1972463A2/fr
Publication of EP1972463A3 publication Critical patent/EP1972463A3/fr
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Publication of EP1972463B1 publication Critical patent/EP1972463B1/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
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D2033/12—
    • B42D2033/20—
    • B42D2035/24—
    • 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
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • 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 for security papers, documents of value and the like with an incident electromagnetic radiation selectively influencing feature area.
  • the invention further relates to a corresponding security paper and a corresponding security film for the production of security or value documents, a data carrier with such a feature area and an associated manufacturing method.
  • Data carriers such as valuables or identity documents, but also other valuables, such as branded goods, are often provided with security features for security, which allow a verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • the security features can be present, for example, in the form of separately produced security elements which are inserted or applied to the data carriers, for example in the form of a security thread embedded in a banknote, a covering sheet for a banknote with a hole, an applied security strip or a self-supporting transfer element that is in accordance with his Production is applied to a document of value.
  • the security features are also printed directly on the disk to be protected or introduced into the volume of the data carrier substrate.
  • the object of the present invention is to further improve security elements, security papers, security films and value documents of the type mentioned above with regard to their security against imitation.
  • the feature area contains a material with a photonic band gap.
  • materials often referred to as photonic crystals, are periodically constructed nanostructures that act on light waves in a manner similar to semiconductor crystals on electron waves.
  • a periodic modulation of the dielectric constant By a periodic modulation of the dielectric constant, light in the photonic crystal can propagate only in certain wavelength ranges, while in other wavelength ranges leads to a destructive interference of the light waves in all spatial directions. Light from this wavelength range can therefore not propagate because of lack of suitable modes of the electromagnetic field in the crystal, so that this wavelength range is referred to as a photonic band gap in analogy to the electronic band gap in semiconductors.
  • a perfect photonic crystal is a perfect reflector for light from the wavelength range of the band gap. Similar to semiconductors, the targeted incorporation of defects that disturb the periodic structure of the crystal and control its band structure in a controlled manner, within the bandgap defect modes are generated. Light from the forbidden area can be controlled in the crystal in such localized modes.
  • Photonic crystals may consist, for example, of structured semiconductors, glasses or polymers.
  • the feature region selectively absorbs incident electromagnetic radiation in a narrow spectral range.
  • the narrow spectral range of selective absorption in the near infrared in particular in the range between 800 nm and 1500 nm, most preferably in the range between 800 nm and 1000 nm.
  • all known IR absorbers are usually colored, based on the photonic bandgap material, a colorless or white IR absorber. When used in security printing machine-readable, extremely brilliant shades can be realized that are hardly fake.
  • the feature regions can also have specific IR absorption properties. Since the position of the absorption bands can be adjusted within a wide range by varying the size and / or the refractive index difference of the matrix and photonic bandgap material (as a direct structure or as an inverse photonic crystal), a narrow polydispersity of the photonic crystals allows deliberately narrow absorption bands set in the infrared. Thus, two or more photonic crystals are different Size or combined with different refractive index, so can generate targeted band patterns that can be detected by an IR sensor as a mark of authenticity. For example, different photonic crystals may be mixed for this purpose, or different photonic crystals may be stacked in layers. Of course, one or more components can be specifically coded in the mixture.
  • the feature region selectively absorbs incident electromagnetic radiation in the ultraviolet spectral range.
  • a feature area can be used, for example, as protection of non-light-emitting materials by applying the feature area over the area to be protected in pigmented form as a protective lacquer or over the entire surface as a polymeric cover layer.
  • the selective reflection of the incident electromagnetic radiation is utilized by the feature area.
  • This spectral range of selective reflection can be, for example, in the ultraviolet spectral range.
  • a machine good detectable contrast between the feature area and the background can be obtained, for example, by placing the feature area on a UV absorbing substrate, such as unlit paper.
  • the feature region is advantageously colorless in the visible spectral range, so that the selective influencing of the incident radiation is imperceptible to the naked eye.
  • the same advantage can be achieved if the feature region has a white body color in the visible spectral range.
  • the spectral range of selective reflection is in the visible spectral range.
  • the feature area can then in particular appear optically variable, so that the viewer is given different color impressions at different viewing angles.
  • the feature area can be present in all the embodiments mentioned in the form of patterns, characters or codes, which can be visible or invisible depending on the selected reflection and absorption behavior and thus form visually and / or machine-detectable security features.
  • the feature area is deformed in partial areas, in particular embossed, in order to create areas with different selective influencing of the incident electromagnetic radiation.
  • the feature region in the undeformed subregions may selectively reflect light of a first wavelength and light of a second, different wavelength in the deformed subregions reflect selectively.
  • the feature region in the undeformed subregions can selectively absorb light of a first wavelength and selectively absorb light of a second, different wavelength in the deformed subregions.
  • the material is introduced with a photonic band gap in a reversibly deformable matrix, for example in a gel, a soft paint or a soft color.
  • the material with a photonic band gap can also be reversibly deformable itself and, for example, have rubber-elastic properties.
  • the feature area therefore forms a piezochromic, optically variable system.
  • deformations of the photonic bandgap material can be generated not only by pressure but also by other external stimuli, such as temperature, voltage, magnetism, light or sound.
  • the material having a photonic band gap can be formed, in particular, by nanoparticles that are spherical in the undeformed state.
  • the preparation of such nanoparticle structures is based on the self-organized arrangement of monodisperse spheres, for example of latex, PMMA, polystyrene or inorganic-polymer hybrid particles. These materials can be used, for example, by emulsion polymerization or by means of wet chemistry and subsequent sintering for the production of photonic bandgap material.
  • latex beads can be sedimented to lie in a three-dimensional hexagonal array.
  • the system can be in a gas phase process are filled with a dielectric and the latex balls are then removed by dissolution, so that a periodic arrangement in the form of an artificial inverted opal, which has a photonic band gap.
  • an inverse opal structure is created by coating monodisperse SiO 2 particles with photopolymers and then photopolymerizing them. The SiO 2 is then dissolved by addition of hydrofluoric acid to give an inverse opal in a deformable acrylate matrix whose "holes" are filled with air.
  • the described piezochromic effects can thus be achieved both with direct structures in which photonic bandgap material is introduced into a matrix, as well as with inverse photonic crystals, which are also referred to as inverse opals in the context of this description and in which initially present balls in the course of Removed manufacturing process to produce a matrix with air-filled holes.
  • photonic crystals can also be produced with a top-down approach, that is, by artificial structuring of bulk material.
  • suitable channels are etched or etched into the starting material, for example by lithographic techniques, which lead to a photonic bandgap in the remaining material.
  • the photonic bandgap material may form a shell for a functional system such as a thermochromic leuco dye or thermochromic liquid crystals.
  • a functional system such as a thermochromic leuco dye or thermochromic liquid crystals.
  • the feature area can thus form a thermochromic, optically variable system.
  • the functional systems can be introduced, for example, in an emulsion polymerization, wherein the embedding in the shells promises as a further advantage a consistency improvement. It is also conceivable to use inverse structures as a matrix, which are then also filled with functional systems.
  • the photonic crystals can be encoded by laser exposure and / or ablated in subregions to provide further information.
  • the invention also includes a security paper and a security sheet for the production of security or value documents having a feature area selectively influencing incident electromagnetic radiation containing a photonic bandgap material.
  • the feature area can be further developed in particular in the manner described above.
  • the feature area can be present in the interior of the security paper or the security film, or can be present in a layer applied to the security paper or the security film, in particular in a printed printing layer.
  • the feature area can also be present in a separate security element of the type described above, which is introduced into or applied to the security paper or the security film.
  • the invention further comprises a data carrier, in particular a value document, such as a banknote, an identity card or the like, with a feature region selectively influencing incident electromagnetic radiation, which contains a material having a photonic bandgap.
  • a data carrier in particular a value document, such as a banknote, an identity card or the like
  • a feature region selectively influencing incident electromagnetic radiation which contains a material having a photonic bandgap.
  • the feature area is advantageously designed further in the manner described above in more detail.
  • the feature area of the data carrier may be present in the interior of the data carrier, or in a layer applied to the data carrier, in particular in an imprinted print layer.
  • the feature area may also be present in a separate security element of the type described above that has been introduced or applied to the data carrier.
  • the feature area is arranged at least partially over an information applied to the data carrier.
  • the feature area in a first state hinders the view of the underlying information.
  • an external stimulus such as pressure, temperature, voltage, magnetism, light or sound, the feature area is transitioned to a second state where it releases the view of the underlying information.
  • the invention further includes a method for producing a security feature of a security element, security paper, security film, or data carrier in which a feature area is provided with a photonic band gap material to provide a range of features selectively influencing incident electromagnetic radiation.
  • the feature region can be produced in particular by printing on a printing ink containing photonic bandgap material by imprinting a printing ink containing interference pigments from photonic bandgap material or by introducing photonic bandgap material into the bulk of a substrate.
  • Fig. 1 1 shows a schematic representation of a banknote 10 having a feature area 12 according to the invention.
  • the feature area 12 is in the illustrated embodiment in the form of an imprinted machine-readable barcode that does not stand out in the visible spectral range due to a white body color of the ink used from the likewise white background. Due to the photonic band gap material contained in the feature area 12 exhibit the printed areas in the near infrared have a characteristic narrow-band absorption, which can easily be detected by machine.
  • Fig. 2 shows a cross section through a banknote 20, on the substrate 22 in a feature area, a print layer 24 is printed.
  • the print layer 24 contains a binder matrix in which interference pigments of photonic bandgap material 26 are introduced.
  • the interference pigments or the photonic band gap material are represented schematically by an arrangement of circular disks.
  • suitable wet-chemical methods such as by a sol-gel method or by emulsion polymerization, such interference pigments can be produced comparatively inexpensively.
  • a dispersion varnish layer containing photonic bandgap material is also suitable.
  • this material is formed by spherical nanoparticles.
  • the reflection and absorption characteristics of the photonic bandgap material 26 can be made as desired by suitably adjusting the location and size of the photonic band gap, and optionally by introducing defect modes into the bandgap in a wide range.
  • the bandgap of the material 26 and the defect modes in the bandgap are selected so that the material 26 of the incidental electromagnetic radiation 30 substantially completely reflects the visible and ultraviolet radiation component 32 and absorbs a very narrow band near infrared region from the infrared radiation component.
  • the set absorption wavelength is preferably between 800 nm and 1000 nm, for example at about 850 nm.
  • the printed print layer 24 has a white body color for the viewer.
  • the narrow band near infrared absorption can be readily detected by illuminating the feature area with infrared radiation and recording the reflected radiation with a suitable detector, such as a silicon detector.
  • the feature area can be designed in particular in the form of patterns, characters or codes, as in FIG Fig. 1 shown.
  • Fig. 3 shows a cross section through a value document 40 with a feature area 42 containing a printed in the form of a pattern, a character or a coding photonic bandgap material 44.
  • the feature area 42 may be combined with other printing or functional layers 46, 48 that are applied to the value document substrate above and / or below the feature area.
  • the photonic bandgap material 44 may be selected to be colorless in the visible spectral region, or to have a white body color and to absorb only narrow band in the infrared.
  • the photonic bandgap material 44 may be selected to be colorless in the visible spectral region, or to have a white body color and to absorb only narrow band in the infrared.
  • the feature area may also be located inside a value document substrate, as in FIG Fig. 4 shown.
  • the value document 50 shown there contains a security film 52 in whose volume in a feature area 54 a photonic bandgap material 56 is introduced, which in turn is designed for narrow-band absorption in the near infrared.
  • the thus provided with an authenticity feature security film 52 is then combined in a conventional manner with other pressure and / orjansschichen 58.
  • the body color of the band gap material 56 is matched to the body color of the security film 52 by the choice of the band gap and the defect structure, so that the feature region 54 visually does not appear.
  • the printed or functional sheaths 58 may also be matched to the optical properties of the bandgap material 56 in order, for example, to enable a detection of the IR absorption of the bandgap material 56 from the top side of the value document 50.
  • the bandgap and defect structure of the photonic bandgap material may also be adjusted to form a UV-reflective feature area on a UV-absorbing substrate, such as unlit paper.
  • the feature region can be invisible in the visible spectral range.
  • the photonic bandgap material can be used as a UV-absorbing feature area, for example for the protection of non-lightfast materials.
  • the colorless material is applied over the entire area over the area to be protected, for example as a protective coating in pigmented form or over the entire surface as a polymeric cover layer.
  • the photonic bandgap material in further embodiments is adjusted so that it selectively reflects light from the visible spectral range, optically variable systems are obtained which change color when the viewing angle is changed.
  • Fig. 5 shows for illustration the feature area 60 of a value document which contains a photonic bandgap material in the form of spherical nanoparticles 64 in an undeformed portion 62.
  • the photonic bandgap material in the undeformed portion 62 has a reflection wavelength ⁇ 1 , which may be in the visible, ultraviolet or infrared spectral range.
  • the order of the periodic nanoparticle structures has been permanently changed by a blind embossing, that is to say by local exertion of considerable pressure.
  • the embossing causes the nanoparticles 68 to be deformed and / or arranged with a changed intermediate spacing, as in FIG Fig. 5 shown schematically.
  • the altered order of the nanoparticles 68 causes a change in the photonic bandgap and thus also a change in the reflection properties of the material, so that the photonic bandgap material in the deformed subregions 66 has a reflection wavelength ⁇ 2 different from ⁇ 1 .
  • the deformation by blind embossing can be carried out with very high accuracy, so that in this way detailed color cuts highest Create resolution.
  • IR-absorbing nanoparticles 64 are used, the wavelength of the narrow-band IR absorption due to the deformation can be shifted out of the sensitivity range of the selected IR detector or out of the passband of a suitably chosen filter. In this way, an extremely fine IR cut can be generated, which can be detected mechanically with corresponding sensors.
  • the photonic band gap material in the form of spherical nanoparticles 70 is embedded in a reversibly deformable matrix 72, for example in a gel, a soft lacquer or a soft color.
  • a reversibly deformable matrix 72 for example in a gel, a soft lacquer or a soft color.
  • the photonic bandgap material according to the selected band gap on a reflection wavelength ⁇ 1 which may be in the visible, ultraviolet or infrared spectral range.
  • the shape and / or arrangement of the spherical nanoparticles changes, as in the right half of FIG Fig. 6 shown.
  • the band gap and thus the reflection wavelength of the material changes, so that by applying pressure 74, a shift of the reflection wavelength can be achieved to a value ⁇ 2 different from ⁇ 1 .
  • the reversibly deformable matrix 72 restores the initial state and thus the original reflection wavelength ⁇ 1 .
  • the feature area with the photonic bandgap material therefore exhibits piezochromic, optically variable behavior that can be triggered interactively by a user for authenticity testing.
  • the initial state is represented by spherical rubber-elastic nanoparticles 80 in which the feature region has a reflection wavelength ⁇ 1 corresponding to the selected band gap.
  • the shape and / or arrangement of the nanoparticles 80 changes, so that the reflection wavelength of the material shifts to a value ⁇ 2 .
  • the restoring force of the rubber-elastic nanoparticles 80 restores the initial state and thus the original reflection wavelength ⁇ 1 of the feature region.
  • the described deformations can be generated not only by pressure but also by other external stimuli, such as temperature, electrical voltage, magnetism, light or sound.
  • other external stimuli such as temperature, electrical voltage, magnetism, light or sound.
  • an embedding matrix with a high coefficient of thermal expansion may be used, such that the distance of the nanoparticles 70 changes with temperature.
  • embedding in thermoactive hydrogels is possible.
  • the spherical nanoparticles 90 form shells for a functional system. If these shells are filled, for example, with thermochromic leuco dye systems 92 or thermochromic liquid crystals, the result is a thermochromic, optically variable system whose reflection wavelength ⁇ 1 or ⁇ 2 changes with temperature 94. As indicated by the double arrow 94 in Fig. 8 implied, too this color change on return to the starting temperature reversible, so that a thermochromic, optically variable system is formed.
  • the banknote 100 is provided with a security element 102 which comprises a through-hole 103, an imprint 104 on the banknote substrate 101, a foil 105 covering the through-hole 103 and the imprint 104, and a photonic band-gap material feature region 106 according to the invention.
  • a security element 102 which comprises a through-hole 103, an imprint 104 on the banknote substrate 101, a foil 105 covering the through-hole 103 and the imprint 104, and a photonic band-gap material feature region 106 according to the invention.
  • the imprint 104 is imprinted with a color contrasting with the substrate, it being possible to use a method customary in banknote printing, such as offset printing or nyloprinting. Subsequently, the multi-part through hole 103 is punched out of the substrate to fit the imprint 104, so that the resulting recesses together with parts of the imprint 104 represent desired information, in this case the numerical sequence "20". As in Fig. 9 to recognize the imprint 104 encloses on the one hand the information "20" over the entire surface and contributes at the same time with individual components to represent the information. Not printed is an area 104 'immediately adjacent to the information "20". This area 104 'thereby forms a negative contour to the information shown.
  • the transparent film 105 is applied as a film strip extending over the entire banknote width. Regardless of the feature area 106, the information "20" is particularly clearly visible when the banknote 100 is viewed against a dark background, since then the printed parts 104 of the information complement the background visible through the through-hole 103 for the information "20". by virtue of However, the negative contour 104 ', the information is also visible against a light background, albeit with a lower contrast.
  • the feature area 106 is applied over the information "20".
  • the properties of the photonic bandgap material are set such that the feature region 106 in an initial state obstructs the view of the underlying information "20", for example by appearing opaque in the relevant wavelength range.
  • a suitable stimulus By a suitable stimulus, the band gap of the material in the feature area and thus the optical properties of the feature area 106 is changed, so that the view of the information "20" is released.
  • the stimulation of the feature area can be done for example by applying pressure, a change in temperature or another external stimulus.
  • the substrate 101 further has a background pressure 107, which is indicated in the exemplary embodiment by arcuate lines and is typically realized as a guilloche pattern in the form of an intertwined line pattern.
  • the imprint 104 and the background printing 107 can be produced in the same operation, for example in offset printing or Nyloprint.
  • the film 105 may have line patterns 108 corresponding to the background printing 107, wherein care should be taken to ensure register-accurate application of the film 105, so that the patterns 107 and 108 complement or overlap with an exact fit.
  • the line patterns 107 of the film 105 can in particular be formed as a metallization and thus on the one hand further increase the complexity and security against forgery of the arrangement, on the other hand provide a simple visual inspection possibility of tailor-made application of the film 105.
  • the photonic band gap material can be applied or introduced in various aggregation forms.
  • a particularly simple possibility is the application of a dispersion varnish containing the photonic bandgap material.
  • This method is particularly suitable for application to substrates with low surface roughness, so that in particular films as carriers come into question.
  • the pigment production can be based on the one hand on a direct spalling of the pigments of a film.
  • a film can be coated with a lacquer which promotes peeling of the pigments or which itself can be dissolved in a suitable solvent without destroying the pigments to be prepared.
  • the solvent may in particular also be water.
EP08004395.3A 2007-03-13 2008-03-10 Elément de sécurité Not-in-force EP1972463B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007012042A DE102007012042A1 (de) 2007-03-13 2007-03-13 Sicherheitselement

Publications (3)

Publication Number Publication Date
EP1972463A2 true EP1972463A2 (fr) 2008-09-24
EP1972463A3 EP1972463A3 (fr) 2011-06-22
EP1972463B1 EP1972463B1 (fr) 2013-08-14

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EP08004395.3A Not-in-force EP1972463B1 (fr) 2007-03-13 2008-03-10 Elément de sécurité

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EP (1) EP1972463B1 (fr)
DE (1) DE102007012042A1 (fr)

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WO2010046125A3 (fr) * 2008-10-24 2010-08-05 Giesecke & Devrient Gmbh Elément de sécurité avec élément visuel sensible à la pression
DE102009016533A1 (de) 2009-04-06 2010-10-07 Giesecke & Devrient Gmbh Piezochromes Sicherheitselement auf Flüssigkristallbasis
DE102009016525A1 (de) 2009-04-06 2010-10-07 Giesecke & Devrient Gmbh Mikrokapsel mit Flüssigkristall
WO2010142391A1 (fr) * 2009-06-10 2010-12-16 Giesecke & Devrient Gmbh Élément de sécurité comprenant un fluide magnétique
DE102010045569A1 (de) * 2010-09-16 2012-03-22 Giesecke & Devrient Gmbh Tragbarer Datenträger mit einem Flux-Detektor als Anzeigeelement
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DE102010063982A1 (de) 2010-12-22 2012-06-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zum Erzeugen einer dreidimensionalen Struktur auf einem Substrat
EP2662806A1 (fr) * 2012-05-11 2013-11-13 Sick AG Caractéristique d'identification optique
EP3098086A1 (fr) * 2015-05-27 2016-11-30 Giesecke & Devrient GmbH Élement de securite piezochrome
DE102013225517B4 (de) * 2013-12-10 2018-05-03 Bundesdruckerei Gmbh Sicherheitsdokument mit Prüfeinrichtung für eine Schaltung und Verfahren zum Prüfen einer Schaltung in einem Sicherheitsdokument
CN114236811A (zh) * 2021-12-20 2022-03-25 北京京东方技术开发有限公司 一种反射型电致变色材料、显示装置、制作及驱动方法

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WO2010046125A3 (fr) * 2008-10-24 2010-08-05 Giesecke & Devrient Gmbh Elément de sécurité avec élément visuel sensible à la pression
EP2818919A1 (fr) 2009-04-06 2014-12-31 Giesecke & Devrient GmbH Méthode pour produire une encre d'imprimerie piezochromique, encre d'imprimerie piezochromique, et méthode pour produire un élément de sécurité piézochrome
DE102009016533A1 (de) 2009-04-06 2010-10-07 Giesecke & Devrient Gmbh Piezochromes Sicherheitselement auf Flüssigkristallbasis
DE102009016525A1 (de) 2009-04-06 2010-10-07 Giesecke & Devrient Gmbh Mikrokapsel mit Flüssigkristall
WO2010115803A2 (fr) 2009-04-06 2010-10-14 Giesecke & Devrient Gmbh Élément de sécurité piézochromique à base de cristaux liquides
WO2010115809A1 (fr) 2009-04-06 2010-10-14 Giesecke & Devrient Gmbh Microcapsule à cristal liquide
RU2537610C2 (ru) * 2009-04-06 2015-01-10 Гизеке Унд Девриент Гмбх Микрокапсула с жидким кристаллом
US9411074B2 (en) 2009-04-14 2016-08-09 De La Rue International Limited Security device
US20120139230A1 (en) * 2009-04-14 2012-06-07 De La Rue International Limited Security device
WO2010142391A1 (fr) * 2009-06-10 2010-12-16 Giesecke & Devrient Gmbh Élément de sécurité comprenant un fluide magnétique
DE102010045569A1 (de) * 2010-09-16 2012-03-22 Giesecke & Devrient Gmbh Tragbarer Datenträger mit einem Flux-Detektor als Anzeigeelement
DE102010063982A1 (de) 2010-12-22 2012-06-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zum Erzeugen einer dreidimensionalen Struktur auf einem Substrat
DE102010063982B4 (de) 2010-12-22 2020-07-16 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zum Erzeugen einer dreidimensionalen Struktur auf einem Substrat
EP2662806A1 (fr) * 2012-05-11 2013-11-13 Sick AG Caractéristique d'identification optique
DE102013225517B4 (de) * 2013-12-10 2018-05-03 Bundesdruckerei Gmbh Sicherheitsdokument mit Prüfeinrichtung für eine Schaltung und Verfahren zum Prüfen einer Schaltung in einem Sicherheitsdokument
EP3098086A1 (fr) * 2015-05-27 2016-11-30 Giesecke & Devrient GmbH Élement de securite piezochrome
CN114236811A (zh) * 2021-12-20 2022-03-25 北京京东方技术开发有限公司 一种反射型电致变色材料、显示装置、制作及驱动方法

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