EP2225107B1 - Élément de sécurité et procédé de fabrication - Google Patents

Élément de sécurité et procédé de fabrication Download PDF

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Publication number
EP2225107B1
EP2225107B1 EP08863457A EP08863457A EP2225107B1 EP 2225107 B1 EP2225107 B1 EP 2225107B1 EP 08863457 A EP08863457 A EP 08863457A EP 08863457 A EP08863457 A EP 08863457A EP 2225107 B1 EP2225107 B1 EP 2225107B1
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EP
European Patent Office
Prior art keywords
layer
security element
security
micro
ink layer
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Active
Application number
EP08863457A
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German (de)
English (en)
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EP2225107A1 (fr
Inventor
Manfred Heim
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Giesecke and Devrient GmbH
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Giesecke and Devrient GmbH
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Publication of EP2225107A1 publication Critical patent/EP2225107A1/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
    • B42D25/20—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
    • B42D25/324—Reliefs
    • 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
    • B42D25/30—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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B42D2033/26—

Definitions

  • the invention relates to a security element for securing valuables, a method for producing such a security element and a security paper and a data carrier with such a security element.
  • Security elements for the purpose of security, which permit verification of the authenticity of the data carrier and at the same time serve as protection against unauthorized reproduction.
  • security elements can be designed, for example, in the form of a security thread embedded in a banknote, a covering film for a banknote with a hole, an applied security strip, a self-supporting transfer element or else in the form of a feature area applied directly to a value document.
  • WO 2005/029135 shows such a security element.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression at different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • the present invention seeks to further improve a security element of the type mentioned above and in particular to provide a security element with an attractive visual appearance and high security against counterfeiting.
  • the microrelief structure of the security element may be a diffractive structure, such as a hologram, a hologram lattice image, or a hologram-like diffraction structure, or an achromatic structure, such as a matte structure having a noncolored, typically silvery matte appearance, a micromirror array, a blazed lattice sawtooth groove profile or a Fresnel lens arrangement.
  • the dimensions of the structural elements of the diffractive microrelief structures are usually in the order of magnitude of the light wavelength, that is to say generally between 300 nm and 1 ⁇ m.
  • Some microrelief structures also have smaller features, such as sub-wavelength gratings or moth-eye structures, whose features may also be less than 100 nm.
  • achromatic microrelief structure is sometimes also larger than 1 .mu.m, the dimensions of micromirrors or Blazegitterlinien extend approximately to a height of about 15 microns and a lateral extent of about 30 microns.
  • Relief structures with structural elements of a dimension of less than 30 ⁇ m and in particular relief structures with structural elements of the order of the wavelength of light or below are referred to as microrelief structures in the context of this description.
  • phase-retarding layers which in the context of this description also partly phase-shifting Layers are called optically active layers, which act on the phase of a transmitted light wave.
  • the partial beams of an incident polarized light wave receive a path difference and thus a phase difference due to different refractive indices. If the phase difference of the two partial beams is just one-half or one-quarter wavelength, so-called ⁇ / 2 or ⁇ / 4 layers are obtained.
  • the phase delay of the phase retardation layer in the invention corresponds to a retardation between about ⁇ / 6 and about ⁇ / 2, more preferably between about ⁇ / 4 and about ⁇ / 2.
  • the path difference is given modulo ⁇ , ie in the range between 0 and ⁇ , since a layer with a path difference of, for example, 5/4 * ⁇ or 9/4 * ⁇ causes the same phase delay as a ⁇ / 4 layer.
  • the phase-shifting layer is formed from nematic liquid-crystalline material and / or that the phase-delay layer is in the form of patterns, characters or a coding.
  • the semi-transparent color layer has several partial areas with different color impression.
  • the differently colored color layer areas can represent, for example, national colors, company colors, eye-catching or characteristic color combinations or else the colors of objects which are reproduced by the shape of the partial areas.
  • the semitransparent color layer or its differently colored subareas are in the form of characters, patterns or codes. This includes designs in which the color layer or whose sections have recesses in the form of characters, patterns or codes.
  • the semitransparent color layer has a light transmission between 30% and 95%, more preferably between 60% and 95% and very particularly preferably between 80% and 95% in the visible spectral range.
  • the semi-transparent ink layer can be applied in various ways, advantageously it is printed, for example in screen printing, gravure printing, flexographic printing or another suitable printing process.
  • the semitransparent ink layer may be printed directly onto the microrelief structure, but intermediate layers may also be provided between the ink layer and the microrelief structure, for example the layers of the thin-film element mentioned below or transparent intermediate layers which act, for example, as a protective layer or adhesive layer. It is also possible to provide such transparent intermediate layers between the color layer and the phase delay layer.
  • the semi-transparent ink layer is selected to substantially preserve the polarization state of transmitted light from the visible wavelength range.
  • the patterns, characters or codes formed by the phase retardation layer can be made equally visible both in the areas covered by the color layer and in the areas not covered, as explained in more detail below.
  • the metallization of the microrelief structure is preferably by an opaque or by a semi-transparent metal layer, in particular aluminum, educated.
  • a metallization also an at least partially magnetic layer can be used, so that a further authenticity feature can be integrated without requiring an additional layer in the layer structure.
  • the metallization of the microrelief structure may advantageously have recesses in the form of patterns, characters or codes which form transparent or semitransparent regions in the security element.
  • the observer has a striking contrast to the surrounding color and relief structure effects.
  • the patterns, characters or codes in transmitted light can light up brightly when the security element is applied to a transparent or translucent support.
  • the recesses in the metallization can also be grid-like, preferably with a small areal proportion of 40% or less, so that they are practically inconspicuous in reflected light and only appear in transmitted light.
  • the security element additionally has a thin-film element with a color-shift effect, over which the semitransparent ink layer is arranged, the color impression of the thin-film element and the color impression of at least one subregion of the semi-transparent ink layer being adapted to one another when viewed under predetermined viewing conditions.
  • the thin-film element has a reflection layer formed by the metallization of the microrelief structure, an absorber layer and a dielectric spacer layer arranged between the reflection layer and the absorber layer.
  • the color shift effect in such thin-film elements is based on viewing angle-dependent interference effects due to interference of the light beams reflected at the different sub-layers of the element.
  • the path difference of the light reflected at the different layers depends on the one hand on the optical thickness of the dielectric spacer layer, which determines the distance between the absorber layer and the reflection layer, and on the other hand varies with the respective viewing angle.
  • the path difference is on the order of the wavelength of the visible light, the result is an angle-dependent color impression for the viewer due to the extinction and amplification of certain wavelengths.
  • a multiplicity of different color-shift effects can be designed, for example tilting effects in which the color impression changes with the viewing angle from green to blue, from blue to magenta or from magenta to green.
  • the thin-film element contains an absorber layer with recesses, in the region of which no color-shift effect can be recognized, the semitransparent ink layer being arranged above the thin-film element in the region of the recesses of the absorber layer.
  • the security element is a security thread, a security tape, a security strip, a patch or a label for application to a security paper, document of value or the like.
  • the security element can also have further layers, such as protective layers or additional effect layers with other security features.
  • the invention also includes a method for producing a security element of the type described according to claim 10.
  • the semitransparent ink layer is advantageously printed in the process according to the invention, in particular in screen printing, gravure printing or flexographic printing processes.
  • the phase delay layer can also be printed with advantage over the microrelief structure and optionally the previously applied ink layer or further intermediate layers. Alternatively, the phase delay layer can be applied to a separate carrier foil and transferred to the microrelief structure with the applied color layer.
  • the invention further comprises a security paper with a security element of the type described and a data carrier which is equipped with such a security element.
  • the data carrier may in particular be a banknote, a value document, a passport, a document or an identity card.
  • the security elements described, security papers or data carriers can be used in particular for securing objects of any kind.
  • Fig.1 shows a schematic representation of a banknote 10, which is provided with two security elements 12 and 16 according to embodiments of the invention.
  • the first security element represents a security thread 12 which protrudes at certain window areas 14 on the surface of the banknote 10, while it is embedded in the intervening areas in the interior of the banknote 10.
  • the second security element 16 is formed by a glued transfer element of any shape.
  • the security element 16 may also be designed in the form of a cover film, which is arranged in or above a window area or a through opening of the banknote.
  • Fig. 2 represents a cross section through the security thread and Fig. 3 in (a) and (b) shows schematically the visual impression of the security thread when viewed without aids or when viewed with an applied circular polarizer.
  • the security thread 12 contains a carrier foil 20 and an embossed and cured UV lacquer layer 22 applied to the carrier foil 20.
  • the embossing structures of the lacquer layer 22 form a diffractive microrelief structure in the form of a hologram.
  • the embossed structures can also be a holographic grating image, a hologram-like diffraction structure or an achromatic microstructure with a non-colored, for example, silvery matt appearance.
  • the dimensions of the structural elements of the diffractive microrelief structures are of the order of magnitude of the wavelength of light, that is to say typically have dimensions of between approximately 300 nm and approximately 1 ⁇ m.
  • microrelief structures according to the invention can also have smaller structural elements with dimensions down to 100 nm or less.
  • the structural elements of achromatic microrelief structures can also be greater than 1 ⁇ m.
  • achromatically reflecting micromirrors or blazed grating lines typically have a height of approximately 10 ⁇ m and a lateral extent of approximately 20 ⁇ m.
  • an opaque aluminum layer is applied as a reflection layer 24.
  • the reflective layer 24 has recesses 26 in the form of patterns, characters, or codings that form transparent or translucent areas in the security thread.
  • a semi-transparent ink layer 34 is printed in first regions 30, which has a plurality of partial regions 34-1, 34-2, 34-3 with different color impressions.
  • the colors of the subareas 34-1 to 34-3 may represent the country colors of the issuing state. In other applications also corporate colors, eye-catching or characteristic color combinations or, in particular in the arrangement of the subregions in the form of a pattern, the colors of one of the pattern come questioned object.
  • the microrelief structure without printed ink layer is present.
  • Fig. 3 (a) The color impression of the security thread 12 in supervision is in Fig. 3 (a) is shown schematically, wherein the holographic image generated by the microrelief structure for the sake of clarity itself is not shown.
  • the periodically repeating regions 30 covered by the color layer 34 show a multicolored flag representation which is composed of the three differently colored color layer subregions 34 - 1, 34 - 2, 34 - 3.
  • the security thread 12 appears with the metallic luster of the reflection layer 24.
  • the security thread is translucent, so that there is additionally a noticeable contrast effect in the transmitted light.
  • the security thread 12 also includes a hidden security feature formed by a transparent phase retardation layer 36 that is patterned in second regions 38 over the microrelief structure.
  • the phase retardation layer 36 is made of a birefringent material, for example of nematic liquid crystalline material.
  • the layer thickness of the phase retardation layer 36 is typically chosen such that its phase delay corresponds to a path difference between about ⁇ / 6 and about ⁇ / 2, preferably about ⁇ / 4, where ⁇ represents a wavelength in the visible spectral range.
  • the second regions 38 with the phase retardation layer 36 are virtually undetectable because the phase retardation of the layer 36 acts equally on all polarization directions of the incident light and its light absorption is negligibly small.
  • the right circularly polarized light is converted by the phase retardation layer 36 into linearly polarized light prior to reflection at the reflector layer 24.
  • the unchanged linearly polarized, reflected light passes through the phase retardation layer 36 again and is thereby converted into right-circularly polarized light, which can pass through the circular polarizer 40 in the selected conditions without further notice.
  • the pattern 30, 32 of the open security feature therefore appears to the viewer essentially unchanged as bright.
  • the semi-transparent ink layer 34 largely preserves the polarization state of the transmitted light. This ensures that the pattern formed by the phase retardation layer 36 can be made equally visible in the covered and uncovered areas 30, 32.
  • the microrelief structure and the semi-transparent ink layer 34 may be applied to a first carrier film and the phase retardation layer 36 may be applied to a second carrier film in the form of the desired pattern.
  • the second carrier film is then transferred together with the phase retardation layer 36 by means of laminating adhesive 42 onto the microrelief structure with the semitransparent ink layer 34, and the second carrier film is then stripped off.
  • Fig. 4 Another embodiment of the invention is in Fig. 4 shown. Unlike the design of the Fig. 2 In this exemplary embodiment, the phase retardation layer 36 lies below the semitransparent ink layer 34.
  • the layer denoted by reference numeral 44 represents a transparent layer, for example an adhesive layer, a protective lacquer layer, a primer or the like.
  • the semitransparent ink layer 34 is also covered with a protective lacquer layer 46 , Since the semi-transparent ink layer 34 largely preserves the polarization state of the transmitted light, the operation of the embodiment corresponds to Fig. 4 already at Fig. 2 described mode of action.
  • transparent intermediate layers such as the layers 44 or 46, also in the embodiment of the Fig. 2 be provided.
  • a transparent lacquer layer 48 is first applied to the microrelief structure, and the phase delay layer 36 and the semitransparent ink layer 34 are then printed thereon.
  • the relative arrangement of the color layer regions 34-1 to 34-3 and the regions 38 with the phase delay layer 36 on the lacquer layer 48 are arbitrary.
  • Fig. 6 shows as a further embodiment of the invention, a color shift hologram in which the effects described above are combined with an optically variable thin-film element.
  • the security element 50 of Fig. 6 contains in addition to those already in connection with the FIGS. 2 to 5 described elements a thin-film element 58 with color shift effect, which is applied to the embossed and cured UV lacquer layer 22.
  • the thin-film element 58 comprises a reflection layer 52 formed by an opaque aluminum layer, a vapor-deposited layer on the reflection layer dielectric SiO 2 spacers 54 and a partially transparent absorber layer 56 made of chromium. As explained above, the color shift effect of such a thin-film element 58 is based on interferences of the light beams reflected by the sublayers 52, 54, 56.
  • the reflection layer 52 of the thin-film element 58 simultaneously forms the metallization of the microrelief structure.
  • the absorber layer 56 of the thin-film element has in the exemplary embodiment recesses 60, in the region of which the thin-film element 58 has no color-shift effect due to the absence of interference.
  • Subregions 34-1 and 34-2 of a semitransparent ink layer 34 are respectively applied in the recessed areas 60 of the absorber layer 56.
  • the ink layer areas 34-1 and 34-2 end in registration with the recesses 60 of the absorber layer.
  • the ink layer areas may slightly overlap the absorber, or the non-recessed absorber area may protrude slightly into the ink layer areas 34.
  • the thin-film element 58 and the ink layer regions 34-1 and 34-2 are now matched to one another such that they produce substantially the same color impression at certain viewing angles.
  • the color impression of the thin-film element 58 changes from magenta when viewed perpendicularly to green when obliquely viewed.
  • the semi-transparent ink layer 34 is selected such that it gives a magenta color impression in the ink layer area 34-1 and a green color impression in the ink layer area 34-2.
  • the color impression of the ink layer areas 34-1 and 34-2 practically does not change when the security element 50 is tilted.
  • the green color impression of the regions 66, in which a green color layer 34-2 is present in the recesses 60 clearly stands out.
  • the color impression of the thin-film element 58 changes from magenta to green as the tilt angle increases, while the color impression in the subregions 34-1 and 34-2 covered with the ink layer 34 remains unchanged.
  • those areas 62 in which the thin-film element 58 is present without applied ink layer and without recesses and those areas 66 in which the recesses 60 have a green color layer 34-2 mediate a very similar or even very similar same green color impression.
  • the magenta color impression of the regions 64 clearly stands out from this viewing direction.
  • the regions 66 which clearly protrude when viewed vertically occur visually in the background when the security element is tilted, while the regions 64, which are originally color-matched and thus inconspicuous, visually come to the fore when tilted.
  • the areas 64, 66 may in particular be patterns, characters or Encodings that visually appear or disappear as the security element tilts.
  • the ink layer areas may also be present in non-recessed areas of the absorber layer 56 of the thin-film element 58. Unlike the completely color constant areas 34-1, 34-2 of Fig. 6 When the security element is tilted, the color impression of such areas varies to a certain extent, since the changing tilt color of the thin-film element then somewhat shines through the semitransparent ink layer. The extent of the color change can be determined by the degree of transparency of the semitransparent ink layer. Especially with small structures and compared to the adjacent, strongly farbkippenden areas a slightly lower color consistency for the viewer is virtually imperceptible.
  • the mentioned recesses in the reflection layers can also be grid-like, preferably with a small areal proportion of 40% or less.
  • the recesses of the reflection layers are then practically not incident on reflected light, but only appear in transmitted light.

Claims (15)

  1. Elément de sécurité (12) pour sécuriser des objets de valeur, comportant :
    - une structure en microrelief métallisée, comportant des éléments de structure ayant une dimension inférieure à 30 µm,
    - une couche colorée semi-transparente (34), qui dans des premières zones (30) est disposée au-dessus de la structure en microrelief, et qui comprend plusieurs zones partielles (34-1, 34-2), présentant des impressions colorées différentes,
    - une couche retardatrice de phase transparente (36), qui dans des deuxièmes zones (38) est disposée au-dessus de la structure en microrelief, et qui forme une couche de déphasage pour la lumière émanant de la gamme de longueurs d'onde visibles, et se présente sous forme de motifs, de caractères ou de codages,
    - où la couche colorée semi-transparente (34) présente dans le domaine de couleurs spectrales visibles une transparence à la lumière comprise entre 30 et 95 %, et pour l'essentiel conserve l'état de polarisation de la lumière qui la traverse, qui émane de la gamme de longueurs d'onde visibles.
  2. Elément de sécurité selon la revendication 1, caractérisé en ce que la couche colorée semi-transparente présente dans le domaine de couleurs spectrales visibles une transparence à la lumière comprise entre 60 et 95 %, et de préférence entre 80 et 95 %.
  3. Elément de sécurité selon la revendication 1 ou 2, caractérisé en ce que la couche colorée semi-transparente, ou ses zones partielles ayant des couleurs différentes, se présente sous forme de caractères, de motifs ou de codages.
  4. Elément de sécurité selon au moins l'une des revendications 1 à 3, caractérisé en ce que la structure en microrelief représente une structure diffractive telle que par exemple un hologramme, un motif holographique à réseau diffractant ou une structure de diffraction analogue à un hologramme, ou représente une structure achromatique telle que par exemple une structure mate, un arrangement de micromiroirs, un réseau blazé ayant un profil de rainures de type dents de scie, ou un arrangement de lentilles de Fresnel.
  5. Elément de sécurité selon au moins l'une des revendications 1 à 4, caractérisé en ce que la métallisation de la structure en microrelief est formée d'une couche métallique opaque ou semi-transparente, de préférence d'une couche d'aluminium opaque ou semi-transparente.
  6. Elément de sécurité selon au moins l'une des revendications 1 à 5, caractérisé en ce que la métallisation de la structure en microrelief comprend des évidements sous forme de motifs, de caractères ou de codages, qui forment dans l'élément de sécurité des zones transparentes ou translucides.
  7. Elément de sécurité selon au moins l'une des revendications 1 à 6, caractérisé en ce que l'élément de sécurité comprend en outre un élément en couche mince à effet goniochromatique, au-dessus duquel est disposée la couche colorée semi-transparente, l'impression colorée de l'élément en couche mince et l'impression colorée d'au moins une zone partielle de la couche colorée semi-transparente étant adaptées l'une à l'autre lors d'une observation dans les conditions d'observation prédéterminées.
  8. Elément de sécurité selon la revendication 7, caractérisé en ce que l'élément en couche mince contient une couche réfléchissante formée par la métallisation de la structure en microrelief, une couche absorbante, et une couche d'écartement diélectrique disposée entre la couche réfléchissante et la couche absorbante.
  9. Elément de sécurité selon la revendication 7 ou 8, caractérisé en ce que l'élément en couche mince contient une couche absorbante comportant des évidements, dans la zone desquels aucun effet goniochromatique ne peut être reconnu, et que la couche colorée semi-transparente est, dans la zone des évidements de la couche absorbante, disposée au-dessus de l'élément en couche mince.
  10. Procédé de fabrication d'un élément de sécurité selon au moins l'une des revendications 1 à 9, dans lequel
    - on applique sur un substrat une couche de vernis d'estampage (22), et on l'estampe et la métallise sous forme d'une structure en microrelief telle que souhaitée, comportant des éléments de structure ayant une dimension inférieure à 30 µm,
    - on dispose au-dessus de la structure métallisée en microrelief, dans des premières zones (30), une couche colorée semi-transparente (34) qui comprend plusieurs zones partielles (34-1, 34-2), présentant des impressions colorées différentes,
    - dans des deuxièmes zones (38), on dispose au-dessus de la structure en microrelief une couche transparente retardatrice de phase (36), qui pour la lumière émanant de la gamme de longueurs d'onde visibles forme une couche de déphasage, et est constituée sous forme de motifs, de caractères ou d'un codage,
    - où la couche colorée semi-transparente (34) est constituée de telle sorte qu'elle présente dans le domaine spectral visible une transparence à la lumière comprise entre 30 et 95 %, et pour l'essentiel conserve l'état de polarisation de la lumière qui la traverse, émanant de la gamme de longueurs d'onde visibles.
  11. Procédé selon la revendication 10, caractérisé en ce que la couche retardatrice de phase est imprimée sur la structure en microrelief et éventuellement sur la couche colorée.
  12. Procédé selon la revendication 10, caractérisé en ce que la couche retardatrice de phase est disposée sur une feuille formant support, et est transférée sur la structure en microrelief avec la couche colorée appliquée.
  13. Papier de sécurité pour la fabrication de documents de sécurité ou de valeur tels que des billets de banque, des chèques, des cartes d'identité, des certificats ou analogues, qui est muni d'un élément de sécurité selon au moins l'une des revendications 1 à 9.
  14. Support de données, en particulier article de marque, document de valeur ou analogues, ayant un élément de sécurité selon l'une des revendications 1 à 9.
  15. Utilisation d'un élément de sécurité selon au moins l'une des revendications 1 à 9, d'un papier de sécurité selon la revendication 13 ou d'un support de données selon la revendication 14 pour protéger contre une falsification des articles de toute nature.
EP08863457A 2007-12-20 2008-12-17 Élément de sécurité et procédé de fabrication Active EP2225107B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007061838A DE102007061838A1 (de) 2007-12-20 2007-12-20 Sicherheitselement und Verfahren zu seiner Herstellung
PCT/EP2008/010743 WO2009080264A1 (fr) 2007-12-20 2008-12-17 Élément de sécurité et procédé de fabrication

Publications (2)

Publication Number Publication Date
EP2225107A1 EP2225107A1 (fr) 2010-09-08
EP2225107B1 true EP2225107B1 (fr) 2011-07-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08863457A Active EP2225107B1 (fr) 2007-12-20 2008-12-17 Élément de sécurité et procédé de fabrication

Country Status (4)

Country Link
EP (1) EP2225107B1 (fr)
AT (1) ATE516967T1 (fr)
DE (1) DE102007061838A1 (fr)
WO (1) WO2009080264A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201003136D0 (en) 2010-02-24 2010-04-14 Rue De Int Ltd Optically variable security device comprising a coloured cast cured hologram
GB201301788D0 (en) 2013-02-01 2013-03-20 Rue De Int Ltd Security devices and methods of manufacture thereof
DE102013002137A1 (de) 2013-02-07 2014-08-07 Giesecke & Devrient Gmbh Optisch variables Flächenmuster
FR3028801B1 (fr) 2014-11-24 2021-11-19 Arjowiggins Security Element de securite
DE102015006793A1 (de) * 2015-05-27 2016-12-01 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement
DE102017006507A1 (de) * 2017-07-10 2019-01-10 Giesecke+Devrient Currency Technology Gmbh Strukturelement

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6761959B1 (en) 1999-07-08 2004-07-13 Flex Products, Inc. Diffractive surfaces with color shifting backgrounds
US6544369B1 (en) * 1999-12-28 2003-04-08 Japan Tobacco Inc. Process for producing thin film-like material having decorative surface
JP4121773B2 (ja) * 2002-05-15 2008-07-23 大日本印刷株式会社 光回折層を有する偽造防止用紙、及び有価証券
DE10342674B4 (de) * 2003-09-16 2007-07-19 Leonhard Kurz Gmbh & Co. Kg Verfahren und Foliensystem zur Herstellung eines individualisierten optisch variablen Elements
WO2005101069A1 (fr) * 2004-04-14 2005-10-27 Dai Nippon Printing Co., Ltd. Support de jugement d’authenticité, matériau de base capable de juger de l’authenticité, étiquette de jugement d’authenticité, feuille transfert de jugement d’authenticité, feuille pouvant juger de l’authenticité et élément d’
EP1744904B2 (fr) * 2004-04-30 2019-11-06 Giesecke+Devrient Currency Technology GmbH Materiau en feuille et son procede de fabrication
DE102004049118A1 (de) * 2004-10-07 2006-04-13 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung

Also Published As

Publication number Publication date
ATE516967T1 (de) 2011-08-15
EP2225107A1 (fr) 2010-09-08
WO2009080264A1 (fr) 2009-07-02
WO2009080264A8 (fr) 2009-08-13
DE102007061838A1 (de) 2009-06-25

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