• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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    • 专利摘要:

    公开号:AT510220A1
    申请号:T0121410
    申请日:2010-07-19
    公开日:2012-02-15
    发明作者:Juergen Dr Keplinger
    申请人:Hueck Folien Gmbh；
    IPC主号:
    专利说明:

    · * I ♦ I * ft
    Security element with an optically variable layer
    The invention relates to a security element with an optically variable layer 5 which conveys different color impressions at defined viewing angles.
    Security elements with optically variable layers, which impart different color impressions at certain viewing angles, or process 10 for the production thereof are known, for example, from EP 1 716 007 B or EP 1 558 449 A.
    WO 2006/040069 A discloses a security element for protecting valuables with an optically variable layer, which likewise imparts different color impressions at different viewing angles. In addition, a semitransparent ink layer is arranged in a limited coverage area over the optically variable layer, the color impression of which is adapted to the color impression of the optically variable layer under predetermined viewing conditions. 20
    A disadvantage of this security element is that by overprinting part of the optically variable layer with a color layer, the recesses in this area optionally integrated in the optically variable layer structure in one or more layers are, as it were, extinguished and not more recognizable.
    In addition, the color matching of a printing layer to the shiny metallic color impression of the optically variable layer is extremely problematic, so that only unsatisfactory results are achieved here. It was therefore an object of the present invention to provide a corresponding security element with high protection against counterfeiting, which avoids the disadvantages of the prior art.
    ♦ «« «4
    The invention therefore provides a security element with an optically variable layer which has different color impressions at different viewing angles, characterized in that a 5-colored metallic layer is arranged in a defined area above or next to the optically variable layer, the color impression of this layer the color impression of the optically variable layer is adjusted under a defined viewing angle.
    The colored metallic layer consists on the one hand of a layer of a metal compound with a defined thickness and defined optical properties (spectral absorption, refractive index, transparency) and on the other hand of an at least partially reflective metallic layer.
    Suitable metal compounds are transparent or partially transparent materials which have a defined or selective spectral absorption and ideally a refractive index> 1.6, in particular these may be oxides, sulfates or fluorides of metals or semiconductors. Examples are oxides of Ti, Zn, Cu, Zr, Al, Cr, Mg, Hf, Si, Y or Ta, complex oxides such as indium tin oxide (ITO), antimony tin oxide (ATO), fluorine tin Oxide (FTO) or Zn-20 chromate, as well as ZnS, BaF2, MgF2, CaF2.
    As at least partially reflective metallic layer, metals such as e.g. Al, Sn, Cu, Zn, Pt, Au, Ag, Cr, Ti, Mo, Fe or their alloys, e.g. Cu-Al, Cu-Sn, Cu-Zn, iron alloys, steel, 25 stainless steel or the like.
    The layers are preferably applied to a carrier substrate or a carrier substrate already coated with other layers by means of a PVD or CVD method. In a PVD process, the coating is applied under vacuum (up to 10'12 mbar, preferably 10'2 to 10'6 mbar) at a temperature dependent on the vapor pressure and the thickness of the coating to be applied on the carrier substrate, for example by thermal evaporation, arc or electron beam evaporation deposited.
    Another possibility is the application of the coating by AC or 5 DC sputtering, wherein the appropriate method is selected depending on the thickness of the layer to be applied and the material used.
    In a CVD process, the materials to be applied are introduced in the form of gaseous (e.g., organometallic) precursors (so-called 10 precursors) by means of an inert carrier gas (e.g., N 2, argon)
    Introduced vacuum coating system, broken up by the entry of energy and reacted. Part of the reaction products condenses on the substrate where it forms the desired layer, the remaining reaction products are removed via a vacuum system. Gaseous precursors may be e.g. CO, CO2, oxygen, silanes, methane, ammonia, ferrocene, trimethylaluminum, or the like.
    The introduction of the energy can e.g. by means of an ion or electron beam, a plasma or at elevated temperature. Considering such a layer sequence from the metal compound side, the light first passes through the metal compound layer, is reflected by the at least partially reflective metallic layer, and passes through the metal compound layer a second time. The color impression is now produced by a defined spectral absorption and interference in the layer of a metal compound in conjunction with the spectral reflection behavior of the underlying at least partially reflective metallic layer.
    The color impression is thus determined by the following parameters: • Optical properties of the layer of a metal compound • Thickness of the layer of a meta-layer • »4: * ♦ ♦ • Spectral reflection behavior of the at least partially reflective metallic layer
    The optical properties of the metal compound layer are dependent on the material chosen, which first determines the refractive index of the layer. Thus, e.g. For example, a TiOx layer has a refractive index of about 2.2, a CuOx layer has a refractive index of about 2.0, and MgF2 has a refractive index of 1.38. Also, absorption is an intrinsic property of the material and is typically spectrally characteristic, i. The material absorbs more in certain wavelength ranges than in other areas. This is e.g. the case when an absorption edge occurs in the visible range, or when the absorption coefficient uniformly increases with increasing wavelength. The absorption coefficient can also be influenced by the stoichiometry of the compound, which is controlled in the case of oxides, for example via the oxygen partial pressure during the vapor deposition process. If Ti is evaporated in vacuo without the addition of oxygen, a largely opaque layer is formed at thicknesses of 30-50 nm, but upon addition of oxygen during the sputtering process the transparency steadily increases until a stoichiometric oxide compound (T1O2) 20 is present on the carrier substrate , which has only a small residual absorption at the same layer thickness.
    In a partially transparent layer whose optical thickness, ie the product of refractive index (n) and the geometric layer thickness (d) nd, is in the range of the incident light wavelength (approximately in the range of 50-2000 nm), interference effects occur due to the partial reflection of the light at the upper and lower boundary surfaces of the layer. This results in a wavelength-selective amplification or attenuation of the incident light and thus a color effect that changes with the thickness of the layer. If a particular material, e.g. TiOx or CuO * used with constant stoichiometry and optical properties, the color can be adjusted alone on the layer thickness. For example, an 80 stops steaming
    nm thick CuOx layer selectively the green and blue portions and amplifies the yellow portions of the spectrum, while a 160 nm thick CuOx layer of the same composition attenuates the red and blue components and enhances the green components. 5
    The thickness of the layer of metal compounds is 10 - 700 nm, preferably 20 - 200 nm.
    By appropriate selection of the material of which the at least 10 partially reflecting metallic layer is made, the color impression of the overall system can also be influenced. For example, aluminum has a uniformly high reflection and thus a neutral reflection behavior in the entire visible range. Copper, on the other hand, appears reddish, i. the red parts of the light are reflected more strongly than the 15 blue parts. Gold appears yellowish, i. the yellow components are reflected more strongly than other wavelengths. An 80 nm thick CuOx layer (see above) appears yellow-reddish when using a 35 nm thick aluminum mirror, yellow when using a 35 nm thick gold mirror and orange-red when using a 70 nm thick Cu mirror. A 35 nm thick 20 TiOx layer in conjunction with a 200 nm thick Cu mirror appears bright red.
    The thickness of the at least partially reflective metallic layer is between 5 and 500 nm, preferably between 10 and 100 nm. 25
    Characteristic of such a colored metallic layer is the metallic luster, which arises due to the at least partially reflective metallic layer. This color impression differs markedly from other color effects produced, e.g. by overprinting and comes very close to the 30 color impression of an optically variable layer, which also uses a metal mirror. • · • ·
    6: »
    Furthermore, it is possible to produce partially applied layers, which are characterized in that the color layer, ie the layer of a metal compound, and the mirror layer, ie the at least partially reflective metallic layer, are applied without tolerance to one another and in the uncoated areas no layer is present. If a counterfeiter attempts to produce this effect by overprinting a metallically lustrous layer with a translucent color, it is only possible to apply the ink as precisely as possible because of the manufacturing tolerances, however, a color or metal space is always recognizable. The security against forgery of the inventive security feature is significantly increased.
    The preparation preferably takes place by means of a process in which a soluble, optionally pigmented printing ink is applied first, then the layer of a metal compound and the at least partially reflective metallic layer is vapor-deposited and subsequently the printing ink with the overlying layer sequence under the action of a solvent and if necessary removed with mechanical support again. This process is described, for example, in EP-A 1 291 463, the disclosure of which is incorporated herein by reference. 20
    By adapting the color impression of the colored metallic layer to the color of the optically variable layer at a defined viewing angle, a uniform color impression results under this viewing angle. When viewed under a different viewing angle, the color impression does not change in those areas in which the colored metallic layer is applied and visible, whereas in the areas in which the optically variable layer is visible, a distinct color change (color shift effect) is recognizable , 30 With a suitable design of the security element, it is possible to achieve such diverse and astounding visual effects that can also be quickly and easily verified by a layman. • * · 7 »» »*
    As a result, compared to a security element with only one layer, ie either a colored or a color-shifting layer, a significantly increased protection against counterfeiting is achieved. If the colored metallic or the optically variable layer has recesses, for example in the form of characters, symbols, lines, patterns or the like, additional safety effects which can be recognized by transmitted light or incident light can be achieved. If the security element has a diffraction structure or if another layer that has a diffraction structure is provided in the structure, the security can be further increased.
    The optically variable layer may be formed by a thin film structure comprising a reflective layer, a dielectric spacer layer and an absorber layer.
    In a preferred embodiment, the optically variable layer may be composed of an electromagnetic wave reflecting layer or a high refractive index (HRI) layer, and a polymeric spacer layer thereon and a layer formed of metallic clusters. Such layer systems and processes for their preparation are known, for example, from EP 1 716 007 B or EP 1 558 449 A, the content of which is included here. 25
    Each of the layers of this layer structure may have additional properties. Suitable measures for the integration of additional properties are disclosed in EP 1 716 007 B, the content of which is also included here. 30: 8: »» • · • ·
    In further embodiments, the optically variable layer may be defined by a printed ink layer having color-shifting pigments, such as e.g. known from US 5,171,363, or liquid crystals are formed. 5 The layer structure takes place on a carrier substrate.
    As carrier substrates, for example carrier films are preferably flexible plastic films, for example of PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PSU, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM, ABS, PVC , PTFE, 10 ETFE (ethylene tetrafluoroethylene), PFA (tetrafluoroethylene)
    Perfluoropropyl vinyl ether fluorocopolymer), MFA (tetrafluoromethylene-perfluoropropyl vinyl ether fluorocopolymer), PTFE (polytetrafluoroethylene), PVF (polyvinyl fluoride), PVDF (polyvinylidene fluoride), and EFEP (ethylene-tetrafluoroethylene-hexafluoropropylene fluoropolymer). The carrier films preferably have a thickness of 5 to 700 μm, preferably 5 to 200 μm, more preferably 5 to 50 μm.
    Furthermore, metal foils, for example Al, Cu, Sn, Ni, Fe or stainless steel foils having a thickness of 5 to 200 μm, preferably 20 to 80 μm, particularly preferably 20 to 50 μm, may serve as the carrier substrate. The films can also be surface-treated, coated or laminated, for example with plastics, or painted.
    Further, as carrier substrates also pulp-free or cellulose-containing paper, heat-activatable paper or composites with paper, for example composites with plastics having a basis weight of 20-500 g / m2, preferably 40-200 g / m2. be used.
    If the optically variable layer is formed by a thin-film element, the reflective layer is preferably formed by an opaque or by a semitransparent metal layer.
    The reflective layer may also have recesses in the form of patterns, characters or codes that form transparent or semi-transparent regions in the thin-film element.
    The dielectric spacer layer is preferably formed by a print layer or by an ultrathin film, in particular a stretched polyester film.
    As an alternative or in addition to recesses in the reflection layer, the absorber layer and / or the spacer layer may also have recesses in the form of patterns, characters, symbols, lines or codes. There is no color shift effect in the recessed areas of the absorber layer or the spacer layer.
    Optionally, the security element of the invention may additionally comprise a thermoplastic or UV-curable lacquer layer having structures such as diffraction patterns, diffraction gratings, surface reliefs, holograms, kinegrams and the like.
    Such layers having diffraction structures and their production are known, for example, from EP-A 1 352 732 or EP-A 1 310 381, the disclosure of which is incorporated herein by reference.
    The security element according to the invention may additionally contain further security features known to the person skilled in the art. Examples are fluorescent, phosphorescent, magnetic, electrically conductive, thermochromic, photochromic features or other optical security features such as e.g. Microlens systems.
    FIGS. 1 to 6 show embodiments of the security element according to the invention.
    In the figures, 1 means a banknote 2 an at least partially embedded security element in the form of a thread or strip according to the present invention 3 an applied security element 4 a window area in which the security element 2 on the surface of the banknote 1 emerges 5 the area of the security thread, the one FIG. 6 shows the region of the security thread which shows a color independent of the viewing angle. 7 The optically variable layer 8 The colored metallic layer consisting of a layer of metal compounds 8a and an at least partially reflecting metallic layer 8b 9 recesses in the reflective layer variable layer 9a recesses in the colored metallic layer 10 a carrier substrate 11 an electromagnetic wave reflecting layer 12 a polymeric spacer layer 13 a layer formed of metallic clusters 14 a lacquer layer 15 Pr conditions at the surface of the resist layer 14
    Fig. 1 shows a schematic representation of a banknote 1 with an at least partially embedded security element 2 and an applied security element 3 respectively according to an embodiment of the present invention. * · · · «· ::: u • ·
    Fig. 2a shows the structure of a security element 2 according to the invention (here in the form of a security thread) in supervision, i. when viewed at approximately 90 ° to the surface of the security element. When viewed vertically, the color impression in areas 5 and 6 is different. Both in the region 5 and in the region 6, the recesses 9 and 9a are clearly visible. In the region of the recess 9a, the optically variable layer 7 is visible, in the region 9, the security element is at least partially transparent.
    FIG. 2b shows the same security element under a flat viewing angle, in which the color of the security element in region 5 (the so-called tilt color) now corresponds to the color of the colored metallic layer in region 6. The lettering, which is formed by the recesses 9a, is now no longer visible, since there is no more color contrast. 15 Fig. 3 to 6 show cross-sections through the security element 2 along the line A-A, was dispensed proportional representation for reasons of clarity.
    The security thread 2 has a carrier substrate 10, on which initially a 20 optically variable layer 7 is applied.
    The optically variable layer in this embodiment consists of an electromagnetic wave reflecting layer 11 with recesses 9, a polymeric spacer layer 12 and a layer formed of metallic clusters 13. In defined regions 6, a layer of metal compounds 8 is applied to the optically variable 25 layer 7 which in turn has recesses 9a. The colored metallic layer 8 in turn consists of the layer of a metal compound 8a and an at least partially reflective metallic layer 8b. Through the recesses 9a, the observer (symbolized by the eye) now sees the optically variable layer 7. When using a transparent substrate 10, the security element appears at least partially transparent in the regions 9, only one
    • »weak absorption by the layer formed by metallic clusters 13 can be seen.
    FIG. 4 shows a further embodiment of the invention with an additional lacquer layer 14 having embossed structures 15. The application of the layers to the carrier substrate 10 takes place here in the reverse order. First, the lacquer layer 14 is applied to the carrier substrate and provided with an embossing. Thereafter, the colored metallic layer 8 is applied so as to appear colored 10 from the side of the support substrate 10, that is, the color metallic layer 8 is colored. First, the layer of metal compounds 8a and then the at least partially reflective metallic layer 8b is applied. Thereafter, the layer is formed of metallic clusters 13, the polymeric spacer layer 12 and the reflective layer 11 applied, which in turn has recesses 9. The optical impression corresponds to the layer structure 15 of the security element of FIG. 3 and additionally comprises an optically active security feature in the form of a diffraction structure 15.
    FIG. 5 shows an embodiment of the invention in which the colored metallic layer 8 is arranged next to the optically variable layer 7. The effect which results in a change in the viewing angle is slightly different than in the preceding figures, since the optically variable layer 7 is not visible in the region of the recesses 9a. Rather, the security element is transparent at this point if a transparent carrier substrate 10 is used. The consideration is in this case of 25 of the carrier substrate remote side.
    FIG. 6 shows an embodiment of the invention in which the colored metallic layer 8 is arranged in register with recesses in the layer of metallic clusters 13 of the optically variable element 7. Here too, two areas 5 and 6 result, which convey an optically variable and a color-constant impression. The consideration of the security element takes place in this embodiment by the carrier substrate 10. This
    Layer sequence has the advantage that the electromagnetic wave reflecting layer 11 can replace the at least partially reflecting metallic layer 8b in the colored metallic layer 8. The polymeric spacer layer 12 does not disturb the color impression of the colored metallic layer 8, since it is usually transparent. By combining the absorption properties of the spacer layer 12 and the colored metallic layer 8, however, attractive new color effects may well result.
    Optionally, an optically variable, a colored metallic or a combination of these two layers can be applied to the second surface of the carrier substrate again. Thus, e.g. in a value document with window on the front and back of the value document the same or a different effect can be achieved.
    Optionally, the security element can also be protected by a protective lacquer layer or further refined, for example, by laminating or the like.
    Optionally, the security element with a sealable adhesive, such as a hot or cold seal adhesive, or a self-adhesive coating can be applied to the corresponding substrate, or at least partially embedded in paper for security papers by conventional methods, for example, in the paper.
    If necessary, the security elements according to the invention can, after packaging, be used as security features in data carriers, in particular value documents such as identification cards, banknotes or labels, seals on or as packaging material, for example in the pharmaceutical, electronics and / or food industry, for example in the form of blister foils, folding boxes, covers , Foil wrappers are used.
    权利要求:
    Claims (17)
    [1]
    • · 1





    1) security element with an optically variable layer having different color impressions at different viewing angles, characterized in that a colored metallic layer is arranged in a defined region next to the optically variable layer or in another plane of the security element, wherein the color impression of this Layer is adapted to the color impression of the optically variable layer under a defined viewing angle.
    [2]
    2) Security element according to claim 1, characterized in that the colored metallic layer consists of a layer of metal compounds and an at least partially reflective metallic layer.
    [3]
    3) Security element of any one of claims 1 to 2, characterized in that are used as metal compounds oxides, sulfides or chromates of metals.
    [4]
    4) A security element according to any one of claims 1 to 3, characterized in that the at least partially reflecting metallic layer is made of a metal, such as metal. Al, Sn, Cu, Zn, Pt, Au, Ag, Cr, Ti, Mo, Fe, or an alloy, e.g. Cu-Al, Cu-Sn, Cu-Zn, iron alloys, steel, stainless steel.
    [5]
    5) Security element according to one of claims 1 to 4, characterized in that the security element additionally has a diffractive optical structure, such as a hologram, diffraction grating, Oberflächenrelref or Kinegram. • 4
    [6]
    The security element according to one of claims 1 to 5, characterized in that the optically variable layer is a layer of a thin-film element, of color-shift pigments or of liquid crystals.
    [7]
    7) Security element according to one of claims 1 to 6, characterized in that the optically variable layer is formed of a reflective layer, a spacer layer and a layer of metallic clusters.
    [8]
    8) Sicherheitsεeement according to one of claims 1 to 7, characterized in that the optically variable layer and / or one of the layers of the optically variable layer is a partial layer.
    [9]
    9) Security element according to one of claims 7 or 8, characterized in that one of the layers of the layer structure has additional functional properties.
    [10]
    10) Security element according to one of claims 1 to 7, characterized in that the colored metallic layer is partially applied.
    [11]
    11) Security element according to one of the preceding claims, characterized in that on both sides of the security element at least one optically variable and at least one colored metallic layer are applied.
    [12]
    12) Security element according to one of the preceding claims, characterized in that the security element additional fluorescent, phosphorescent, magnetic, electrically conductive, thermochromic, photochromic features or other optical security features such. Contains microlens systems. * · * ·



    [13]
    13) Security element according to one of the preceding claims, characterized in that the security element is equipped with a hot, cold or self-adhesive coating.
    [14]
    14) Security element according to one of the preceding claims, characterized in that the security element is at least partially embedded in a value document.
    [15]
    15) Security element according to one of the preceding claims, characterized in that the security element is applied to the surface of a value document.
    [16]
    16) Security element according to one of the preceding claims, characterized in that the security element is a laminated film composite.
    [17]
    17) Use of the security elements according to one of the preceding claims, optionally after packaging as security features in data carriers, in particular documents of value such as identity cards, cards, banknotes or labels, seals on or as packaging material, for example in the pharmaceutical, electronics and / or food industry, for example in shape Blister foils, folding cartons, covers, foil packaging.
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    引用文献:
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    WO2004014663A1|2002-08-06|2004-02-19|Hueck Folien Ges.M.B.H.|Method for producing tamper-proof identification elements|
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    US5171363A|1979-12-28|1992-12-15|Flex Products, Inc.|Optically variable printing ink|
    DE10143523B4|2001-09-05|2008-08-21|Hueck Folien Gesellschaft M.B.H.|Process for the preparation of a selectively metallised film|
    AT502139A1|2001-11-09|2007-01-15|Hueck Folien Gmbh|RAIL-MATERIAL MATERIALS WITH SURFACE STRUCTURE, METHOD FOR THE PRODUCTION THEREOF AND THEIR USE|
    AT502319B1|2002-04-11|2009-11-15|Hueck Folien Gmbh|SUBSTRATES WITH PREFERABLY TRANSFERABLE LAYERS AND / OR SURFACE STRUCTURES, METHOD FOR THEIR PRODUCTION AND THEIR USE|
    AT504587A1|2004-02-16|2008-06-15|Hueck Folien Gmbh|IMPACT-SAFE SAFETY FEATURE WITH COLOR TIP EFFECT|
    DE102004049118A1|2004-10-07|2006-04-13|Giesecke & Devrient Gmbh|Security element and method for its production|
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    AT517320B1|2015-05-29|2020-04-15|Hueck Folien Gmbh|Security element with color shift effect|
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    EP3954544A1|2020-08-14|2022-02-16|Hueck Folien Gesellschaft m.b.H.|Flat security element with optical security features|
    法律状态:
    2018-03-15| MM01| Lapse because of not paying annual fees|Effective date: 20170719 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1214/2010A|AT510220B1|2010-07-19|2010-07-19|SECURITY ELEMENT WITH AN OPTICAL VARIABLE LAYER|ATA1214/2010A| AT510220B1|2010-07-19|2010-07-19|SECURITY ELEMENT WITH AN OPTICAL VARIABLE LAYER|
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