EP3980273B1 - Élément de sécurité optiquement variable à zone de surface réfléchissante multicolore - Google Patents

Élément de sécurité optiquement variable à zone de surface réfléchissante multicolore Download PDF

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Publication number
EP3980273B1
EP3980273B1 EP20731791.8A EP20731791A EP3980273B1 EP 3980273 B1 EP3980273 B1 EP 3980273B1 EP 20731791 A EP20731791 A EP 20731791A EP 3980273 B1 EP3980273 B1 EP 3980273B1
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EP
European Patent Office
Prior art keywords
security element
reflection
pigments
reflection structure
effect pigments
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20731791.8A
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German (de)
English (en)
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EP3980273A1 (fr
Inventor
Maik Rudolf Johann Scherer
Raphael DEHMEL
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 Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3980273A1 publication Critical patent/EP3980273A1/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
    • B42D25/30—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
    • 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
    • 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
    • B42D25/369—Magnetised or magnetisable materials
    • 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
    • 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
    • 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

Definitions

  • the invention relates to an optically variable security element with a multi-colored reflective surface area for securing valuables.
  • the invention also relates to a method for producing such a security element and to a data carrier equipped with such a security element.
  • Data carriers such as valuables or identification documents, but also other valuables, such as branded items, are often provided with security elements for security purposes, which allow the authenticity of the data carrier to be checked and which also serve as protection against unauthorized reproduction.
  • the security elements can be designed, for example, in the form of a security thread embedded in a banknote, a cover film for a banknote with a hole, an applied security strip, a self-supporting transfer element or also in the form of a feature area printed directly on a document of value.
  • Security elements with a viewing angle-dependent or three-dimensional appearance play a special role in authenticity assurance, as these cannot be reproduced even with the most modern copying machines.
  • 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 a different graphic motif depending on the viewing angle.
  • optically variable effects are described, for example, movement effects, pump effects, depth effects or flip effects, which are realized with the help of holograms, microlenses or micromirrors.
  • the publication EP 3 254 863 A1 relates to a security element with a printed color layer which, in addition to first pigments, also includes second pigments which are designed as magnetic pigments.
  • WO2012/176169 A1 describes a security thread with two optically variable areas arranged parallel and spaced apart from one another, in which flat pigments can each be aligned differently.
  • EP1780040A2 discloses the preamble of claim 1.
  • the invention is based on the object of further increasing the anti-counterfeit security and the visual attractiveness of generic optically variable security elements and, in particular, of providing optically variable security elements with two or more different appearances or effects in different colors.
  • the invention contains an optically variable security element with a multi-colored reflective surface area, which can be used in particular to secure valuables.
  • the surface extent of the security element defines a plane and a z-axis perpendicular to it.
  • the multicolored reflective surface area contains two optically variable reflection structures which are arranged at different height levels in the z direction and which produce a different color impression in reflection.
  • the higher reflection structure is formed by a relief structure provided with a color coating, said relief structure being formed by a micromirror arrangement with directed micromirrors, while the lower one Reflection structure is formed by a layer with platelet-shaped, reflective effect pigments, which are spatially aligned.
  • the two reflection structures overlap in an overlap area and the color coating of the higher reflection structure has at least one recess in the overlap area in which the lower reflection structure appears when the security element is viewed.
  • the overlap mentioned can be partial or complete, so one of the reflection structures can also completely cover the other reflection structure and the two reflection structures can even be designed to be congruent.
  • the overlap mentioned refers to the relative lateral position of the reflection structures in the plane defined by the surface extent of the security element.
  • higher lying and lower lying refer to viewing the security element from the positive z-direction. It is understood that in transparent areas or window areas of a data carrier, an applied security element can typically also be viewed from the back, i.e. the negative z-direction. The viewer then first looks at the layer with the platelet-shaped, reflective effect pigments, and in areas where this layer is translucent or has recesses, also at the relief structure provided with the color coating.
  • the platelet-shaped effect pigments are particularly advantageously formed as platelet-shaped magnetic pigments that can be aligned by a magnetic field, but they can also be platelet-shaped effect pigments which are formed by other fields, for example electric fields, can be aligned.
  • This alignability in magnetic or other fields is a property of the effect pigments themselves.
  • magnetic pigments can be influenced by an external magnetic field and can also be aligned in a mobile state.
  • the effect pigments are already aligned and immobilized, so their alignment is fixed.
  • the aligned effect pigments not only lie flat in the plane of the surface area, but are at least partially tilted against this plane and are therefore spatially aligned.
  • the alignment is determined in particular by the angle of inclination and azimuth angle of the effect pigments. Due to the alignment with the help of an external field, the alignment of the individual ones is Effect pigments not freely selectable. Rather, the alignment of the effect pigments is not individual and is particularly dependent on the field. The field dependence requires, for example, that an alignment difference between neighboring effect pigments corresponds to the maximum possible field change at this distance, i.e. it is rather small. The maximum alignment difference between jointly aligned, neighboring effect pigments is less than 30 degrees for both angles, preferably less than 20 degrees.
  • Metallized pigments in particular aluminum or silver-coated pigments, are preferably used as effect pigments.
  • Pigments with a thin film coating especially color-shifting pigments or aluminum pigments with a coloring coating produced by wet-chemical precipitation processes, can also be considered.
  • reflective metal pigments preferably aluminum pigments, with a translucent color coating can also be used, or pigments with a color coating formed by structural colors, in particular by nano- and binary structures.
  • the platelet-shaped effect pigments advantageously have a ratio of the largest to the smallest diameter (diameter-to-thickness ratio) that is more than 5:1, preferably more than 10:1, and particularly preferably more than 15:1 or even more than 50:1 amounts.
  • the largest diameter of the platelet-shaped effect pigments is preferably between 5 ⁇ m and 35 ⁇ m, preferably between 15 ⁇ m and 25 ⁇ m or between 8 ⁇ m and 12 ⁇ m.
  • Platelet-shaped effect pigments for example, are those in the publications EP 1 689 586 B1 , WO 2010/069823 A1 and WO 2013/090983 A1 particles and pigments described in question.
  • the effect pigments are expediently present in a printing layer with a transparent or translucent binder.
  • the binder can also be colored to create an additional color effect in the security element.
  • the relief structure of the higher-lying reflection structure is formed by a micromirror arrangement with directed micromirrors, in particular with flat mirrors, concave mirrors and/or Fresnel-like mirrors.
  • the orientation (inclination angle and azimuth angle) of the micromirrors of the relief structure can be freely selected for each micromirror.
  • the micromirrors are aligned independently of one another, in particular aligned by means of embossing.
  • a maximum (or average) alignment difference between adjacent micromirrors is - for one or both angles - greater than 90 degrees.
  • Adjacent micromirrors of the relief structure differ in their orientation, in particular in the inclination angle and in the azimuth angle.
  • micromirrors are advantageously below 20 ⁇ m, preferably below 10 ⁇ m.
  • other relief structures can also be used,
  • embossed Fresnel lenses, concave mirrors, hologram structures, nanostructures or diffractive blazed gratings can be used.
  • the relief structure of the higher-lying reflection structure is advantageously formed in a transparent or translucent embossed lacquer layer, in particular embossed into this embossed lacquer layer.
  • the embossing lacquer layer can also be colored in order to create an additional color effect in the security element.
  • the color coating of the higher-lying reflection structure is designed as a regular or irregular grid with grid elements and grid spaces.
  • the grid spaces represent the above-mentioned recesses.
  • the dimensions of the grid elements and/or grid spaces are below 140 ⁇ m, at least in one direction.
  • the dimensions of the grid elements and/or grid spaces are even below 140 ⁇ m in one or both lateral directions, preferably between 20 ⁇ m and 100 ⁇ m, in particular between 20 ⁇ m and 60 ⁇ m.
  • the grid elements and grid spaces of the grid have the same shape and preferably also the same size.
  • the grid elements and/or the grid spaces can in particular be formed by strip-shaped, square, triangular or other polygonal elements, but can also have irregular shapes.
  • the grid itself can be regular, i.e. have a regular arrangement of grid elements and grid spaces, but can also be an irregular grid, for example a stochastic grid, in which the grid elements and / or grid spaces have irregular spacing and/or sizes and/or shapes.
  • the area coverage of the grid by the grid elements is advantageously between 30% and 70%, preferably between 40% and 60%, in particular around 50%.
  • the color coating is advantageously applied alternatively or in addition to the grid mentioned in partial areas which have lateral dimensions of more than 140 ⁇ m, and/or the color coating is produced with recesses which have lateral dimensions of more than 140 ⁇ m.
  • the surface areas surrounding the applied partial areas represent the above-mentioned recesses in the color coating.
  • the lateral dimensions of at least one partial area and/or at least one recess are more than 250 ⁇ m, preferably more than 500 ⁇ m and in particular more than 1 mm.
  • the color coating of the relief structure mentioned is formed in an advantageous design by translucent colors.
  • Metallizations for example made of aluminum, silver or an alloy, such as copper and aluminum, are also possible, as are thin-film structures, in particular color-shifting thin-film structures, gold-blue or silicon-aluminum thin films.
  • the color coating can also be formed by translucent colors with a backed metallic mirror coating, for example made of aluminum.
  • the color coating can represent a translucent image made up of several translucent colors, which is backed with a mirror coating, for example made of aluminum.
  • Luminescent colors in particular fluorescent colors with a metallic mirror coating, can also be considered as color coatings.
  • the color coating can also be done using structural colors, especially nano and binary structures.
  • nanoparticle colors can also be considered as color coatings, such as gold-blue particles, various effect pigments, color-shifting pigments or super silver.
  • the different height levels in which the two reflection structures are arranged advantageously have a distance in the z direction between 5 ⁇ m and 100 ⁇ m, preferably between 10 ⁇ m and 50 ⁇ m.
  • the small vertical distance between the two reflection structures is not noticeable when looking at the security element.
  • the height level of a relief structure is given by the base area of the relief structure, for example a micro-mirror embossing.
  • the height level of aligned effect pigments is given by the middle position of the pigments tilted against the plane of the surface area.
  • the exact definition of the height level is usually not important, since different height levels can be easily achieved, for example, by having the two reflection structures on opposite sides of a carrier film, or by having the two reflection structures one above the other on the same side of a carrier film .
  • the two reflection structures of the reflective surface area provide a color change together with a motif change depending on the viewing angle.
  • the motifs of the two reflection structures can differ in particular in terms of shape (e.g. head, apple or tail), movement (static to moving or moving to static, with linear, rotating and/or pumping movement) and/or dimensionality (2D to 3D, or different three-dimensional with positively or negatively curved Appearance or floating in front of or behind a plane) of the motif.
  • the higher-lying reflection structure generates a first motif with a first color impression that is visible from a first viewing angle range and the lower-lying reflection structure generates a second motif with a second, different color impression that is visible from a second viewing angle range is, wherein the first and second viewing angle ranges do not overlap.
  • the security element When tilted, the security element then shows a binary color and effect change without an overlap area.
  • the two viewing angle ranges can be adjacent to one another or only be separated by an angular distance of a few degrees, so that the associated image impressions change almost seamlessly for the viewer.
  • the higher-lying reflection structure can also generate a first movement motif with a first color impression and the lower-lying reflection structure can generate a second movement motif with a second, different color impression, with the first and second movement motifs moving offset from one another or moving against one another when the security element is tilted crossing in a crossing position in which both movement motifs are visible.
  • the two reflection structures can also generate motifs or movement motifs that are simultaneously visible in the same surface area, that is to say have at least partially overlapping viewing angle areas. Since the vertical distance between the two reflection structures is very small and is well below the resolution limit of the naked eye, they appear the appearances generated by the two reflection structures are present for a viewer at the same time in the same place.
  • a translucent color layer or an image made up of several translucent colors can be present between the two reflection structures in order to create an additional color effect in the security element.
  • the translucent colors do not have to be applied directly on/above the reflective effect pigments, Rather, a translucent color can be applied anywhere between the two reflection structures.
  • a translucent color can also be mixed into another layer, for example by using a colored UV varnish for the embossing varnish layer mentioned, a colored film or a colored binder for the printing layer of the effect pigments.
  • the security element described can also be equipped with colorless or colored negative markings.
  • the overlap area contains partial areas with a negative marking, in which the color coating of the higher-lying reflection structure and the effect pigments of the deeper-lying reflection structure are left out.
  • the entire print layer can be left out in areas to create a negative mark.
  • the printing layer can also have areas in which only the binder is present, but the effect pigments have been removed, for example by laser exposure, or their visual effect has been deactivated.
  • a printing ink with a binder and effect pigments that can be aligned magnetically or by other fields is advantageously applied.
  • the effect pigments are aligned with an external field, in particular an external magnetic field, while the binder is still in the liquid state, in order to achieve the desired spatial alignment and the binder is solidified in order to permanently fix the alignment of the effect pigments.
  • Solidifying the printing ink may include an active curing step, for example by heating or irradiation.
  • the printing ink can optionally additionally comprise volatile components, but is preferably (substantially) free of volatile components.
  • an embossing lacquer layer is advantageously applied to a carrier film, embossed with the desired micromirror relief structure and then provided with the color coating in areas.
  • a further lacquer coating is expediently applied to the embossed and coated embossed lacquer layer, the refractive index of which does not deviate by more than 0.25 from the refractive index of the embossed lacquer layer.
  • the layer sequence produced in this way is applied at least partially overlapping to the printing layer with the effect pigments or to a target substrate.
  • the carrier film used for production can be removed or, for example in the case of a thin, transparent carrier film, can also remain in the security element.
  • Figure 1 shows a schematic representation of a banknote 10 with an optically variable security element 12 according to the invention.
  • the security element 12 simultaneously shows two security features with different visual appearance and movement behavior in the same area.
  • a first security feature 14 of the security element 12 has a metallic, three-dimensional appearance in which a row of larger rings 22 appears to float above a row of corresponding smaller rings 24.
  • the larger and smaller rings 22, 24 move against each other for the viewer and thus create a striking three-dimensional movement feature.
  • a second security feature 16 can be seen, which is designed in the form of a color-shifting zigzag pattern 26.
  • the lines of the zigzag pattern 26 show an outwardly curved three-dimensional appearance, and the color impression of the pattern 26 changes depending on the viewing angle from green when viewed vertically to blue when viewed at an angle.
  • Fig. 2 shows a section of the security element 12 Fig. 1 shown schematically in cross section.
  • the security element 12 contains a flat carrier 18, the surface extent of which defines an xy plane and a z-axis perpendicular thereto.
  • the carrier 18 represents the polymer or paper substrate of the banknote 10.
  • the security element 12 contains a printing layer 30 with color-shifting, platelet-shaped magnetic pigments 32 that are magnetically aligned in the form of the bulging zigzag pattern 26.
  • a printing layer 30 with magnetically alignable magnetic pigments 32 was printed onto the carrier 18, and The magnetic pigments 32 were aligned in the form of the desired motif while the binder 34 was still wet using an external magnetic field. Then the binder 34 was solidified, for example by UV exposure, in order to permanently fix the alignment of the magnetic pigments 32.
  • the magnetic pigments with a color-shifting effect can, for example, be magnetic interference pigments, as described in the EP 1 366 380 A2 and are offered by Sicpa Holding SA, for example, under the names OVMI Gold/Green 5 SK 1001 S, OVMI Green/Blue 5 SK 5001 S and OVMI Magenta/Green 5 SK 3001 S.
  • an embossing layer 40 is arranged above the print layer 30, which includes an embossing lacquer layer 42 with a micromirror embossing 44.
  • the micromirror embossing 44 is provided with a color coating 46, for example a metal layer, which is only present in certain areas and which reveals the print layer 30 in its recesses 54.
  • the micromirror embossing 44 is formed from a large number of micromirrors inclined towards the xy plane and having a typical edge length of approximately 10 ⁇ m.
  • the local angles of inclination of the micromirrors are chosen so that the relief structure formed by the micromirrors together with the color coating 46 has a desired optical appearance, for example the representation of the two rows of rings 22, 24 lying one inside the other Fig. 1 generated.
  • an embossing lacquer layer 42 can be applied to a carrier film, embossed with the desired micromirror relief structure 44 and then provided with the color coating 46 in areas.
  • the coated embossing lacquer layer 44, 46 is then provided with a lacquer coating 48, the refractive index of which essentially corresponds to the refractive index of the embossing lacquer layer 42, and the layer sequence produced in this way is finally applied to the printing layer 30 in an at least partially overlapping manner.
  • the lacquer coating 48 itself can have adhesive properties or an additional adhesive layer can be used.
  • the carrier film used in production can be removed from the embossing lacquer layer or, for example in the case of a thin, transparent carrier film, can also remain on the banknote.
  • the coated micromirror embossing 44, 46 of the embossing layer 40 forms a higher-lying reflection structure in the security element 12, while the spatially aligned magnetic pigments 32 of the printing layer 30 form a deeper-lying reflection structure.
  • the layers 30, 40 form the multicolored reflective surface area of the security element 12.
  • the platelet-shaped magnetic pigments 32 do not just lie flat in the plane of the printing layer 30 due to the magnetic alignment, but are locally tilted to different degrees against this plane and are therefore spatially aligned. In this way, the magnetic pigments 32 reflect to different degrees in different spatial directions and thus create the special, for example, a three-dimensional and/or dynamic appearance of the zigzag pattern 26.
  • the color coating 46 is provided with recesses 54 in order to enable a viewer 56 to see the underlying magnetic pigments 32 in some areas despite the continuous micromirror embossing 44.
  • the color coating 46 is in the design of Fig. 2 in the form of a regular grid 50 made up of grid elements 52 and grid spaces 54.
  • the grid elements 52 and grid spaces 54 form, for example, a checkerboard pattern in which each field, i.e. each grid element 52 and each grid space 54, has a dimension of 100 ⁇ m x 100 ⁇ m. Since the individual micromirrors of the micromirror embossing 44 are generally significantly smaller, for example having an edge length of only 10 ⁇ m, the grid 50 of the color coating 46 falls differently than in the simplified schematic representation Fig. 2 , generally not related to the grid of micromirrors.
  • the thicknesses of the printing layer 30 and the embossing layer 40 are in the range of a few micrometers or a few tens of micrometers, it is not apparent to the viewer 56 that the two optically variable reflection structures are actually arranged at different height levels in the z direction - rather, they appear to be present in the same place at the same time despite their different visual appearance.
  • the grid elements 52 and the grid spaces 54 each have the same dimensions, so that the area coverage of the grid is 50%.
  • the area coverage of the grid with grid elements 52 is preferably between 30% and 70%, in particular between 40% and 60%.
  • the security element 12 the Fig. 1 and 2 arranged in a transparent area or a window area of the banknote 10, it can also be viewed from the back.
  • the viewer 56 then first looks at the print layer 30 with the aligned magnetic pigments 32, so that the security feature 16 in the form of the color-shifting zigzag pattern 26 can also be clearly seen from the back.
  • the first security feature 14 can also be seen, but appears weaker from the back, since the viewer also looks through the binder 34 of the printing layer 30 in the areas without magnetic pigments 32.
  • the metallic, three-dimensional appearance of the micromirror embossing 44 also appears three-dimensionally inverted from the back, so that in the exemplary embodiment the smaller rings 24 appear to float above the larger rings 22.
  • Figure 3 shows some concrete advantageous embodiments of the grid of the color coating 46 of the micromirror embossing 44 in supervision.
  • This shows Fig. 3(a) a grid 50 like it in Fig. 2 is used, in which the grid elements 52 and the grid spaces 54 form a checkerboard pattern.
  • the dimensions of the grid elements and grid spaces are advantageously between 20 ⁇ 20 ⁇ m 2 and 140 ⁇ 140 ⁇ m 2 , the area coverage is 50%. If a different area coverage is to be created, some of the grid elements 52 can be omitted or some of the grid spaces 54 can be occupied with additional grid elements.
  • Figure 3(b) shows a grid 50 with alternately arranged strip-shaped grid elements 52 and grid spaces 54.
  • the width of the grid elements and grid spaces is advantageously between 20 ⁇ m and 140 ⁇ m, the length is arbitrary and can be several millimeters or even a few centimeters.
  • the area coverage can be easily adjusted via the relative width of the grid elements and grid spaces, and is preferably between 30% and 70%, in particular between 40% and 60%.
  • the grid elements and grid spaces can also have other polygonal shapes or irregular shapes. Shows as an example Fig. 3(c) an embodiment in which the grid elements 52 and grid spaces 54 of the grid 50 are formed by triangles. At the grid 50 the Fig. 3(d) the grid elements 52 and grid spaces 54 are formed by irregular shapes.
  • the grid elements and/or grid spaces can also form a coherent structure, such as in Fig. 3(d) shown for the grid spaces 54
  • the surface coverage with grid elements is preferably between 30% and 70%, in particular between 40% and 60%.
  • Figure 4 shows a modification of the design of the Fig. 2 , in which the angle of inclination of the micromirrors of the micromirror embossing 44 and the magnetic orientation of the magnetic pigments 32 are selected so that the appearances generated by the two reflection structures become visible in different, non-overlapping viewing angle ranges and thereby a binary color and effect change when the security element 12 is tilted generate.
  • the micromirrors of the micromirror embossing 44 are aligned, for example, in such a way that the appearance generated by the micromirrors, for example a metallic-looking curvature, is visible in a viewing angle range of +5° to +20° (viewing direction 58-A) relative to the surface normal N .
  • the magnetic pigments 32 were aligned by an external magnetic field in such a way that they produce a running effect that is visible in a viewing angle range of -5° to -20° relative to the surface normal (viewing position 58-B).
  • the viewer looks at the coated micromirrors of the micromirror embossing 44 in the area of the grid elements 52.
  • the viewer can basically perceive the magnetic pigments 32 of the printing layer 30, but their orientation is far from the viewing direction 58-A removed from the glossy angle.
  • the magnetic pigments 32 therefore appear inconspicuous and, since they are strongly outshone by the micromirrors, which are essentially at the gloss angle, they practically do not contribute to the image impression.
  • the viewer from the viewing direction 58-A essentially sees the curved representation generated by the micromirror embossing 44.
  • the micromirrors of the micromirror embossing 44 in the grid spaces 54 have no optical effect due to the lack of refractive index difference of the lacquer layers 42, 48, so that the viewer there looks at the magnetic pigments 32, which are essentially at the gloss angle in the viewing direction 58-B.
  • the micromirrors of the micromirror embossing 44 are basically perceptible, but their orientation is far from the gloss angle when viewed from the viewing direction 58-B. They therefore appear inconspicuous and, since they are strongly outshone by the magnetic pigments 32 at the gloss angle, they practically do not contribute to the image impression. Overall, the viewer from the viewing direction 58-B essentially sees the optically variable running effect generated by the magnetic particles 32.
  • FIG. 5 A further variant of a security element 62 according to the invention is shown in Fig. 5 illustrated.
  • the security element 62 is largely similar to that in connection with Fig. 2
  • the security element 12 described is constructed so that corresponding elements are each provided with the same reference numerals.
  • this also contains Security element 62 a flat carrier 18, a printing layer 30 with aligned, color-shifting, platelet-shaped magnetic pigments 32 and an embossing layer 40 arranged above the printing layer 30 with a micromirror embossing 44 introduced into an embossing lacquer layer 42, which is provided with a color coating 46 present in some areas.
  • a large recess 66 for example in the form of a 5 mm wide and 2 cm long curved strip.
  • the micromirrors of the micromirror embossing 44 have no optical effect due to the lack of refractive index difference between the lacquer layers 42, 48, so that a viewer there looks at the deeper magnetic pigments 32 of the print layer 30.
  • the visual impression of the security element 62 is determined by the higher micromirror embossing 44 and its color coating 46.
  • the micromirror embossing 44 can produce, for example, in the outer area 64 a motif 64 that appears to bulge out of the plane of the security element 62 and appears in a first color.
  • a movement effect in a second color is visible in a partial area 66, which is generated by the aligned magnetic pigments 32.
  • a light bar can move up and down along the partial area 66 when the security element 62 is tilted and create a so-called rolling bar effect. Since the rolling bar effect is just visible in the recess 66 of the color coating 46, the areas of different colors (first and second colors) and different effects (three-dimensional motif or running bar) appear exactly registered to one another.
  • embossing layer 40 can be formed in all variants with or without a carrier film and can be present, for example, in the form of a strip or patch.
  • FIG. 6(a) a polymer banknote 70 with a transparent polymer substrate 72, in which the printing layer 30 and the embossing layer 40 are arranged on opposite sides at least partially overlapping one another.
  • the design of the Fig. 6(b) shows a paper banknote 80 with a paper substrate 82 with window 84.
  • the printing layer 30 and the embossing layer 40 are arranged at least partially overlapping one another on opposite sides of the window 84.
  • Magnetic pigments 32 could also be present inside the window, as in Fig. 6(b) illustrated.
  • Figure 6(c) showed a hybrid banknote 90 with a film/paper/film hybrid substrate 92 with a window 94 in the paper core 96.
  • the printing layer 30 and the embossing layer 40 are arranged on opposite sides of the hybrid substrate 92 and at least partially cover each other in the area of the window 94.
  • the embossing layer 40 can, as in Fig. 6(c) shown, be applied to the outside of the composite of the hybrid substrate 92, but it can also be present, for example, between the paper core 96 and one of the film layers 98 and thus represent a particularly strongly protected, internal security feature.
  • a further variant of the invention consists in not applying the embossing layer in the form of a security film, but rather introducing the embossing structure 44 directly into the polymer substrate of a work document.
  • the printing layer 30 can then be printed in an overlapping manner.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)

Claims (15)

  1. Élément de sécurité optiquement variable destiné à sécuriser des objets de valeur dont l'étendue de surface définit un axe z perpendiculaire à celui-ci, ledit élément de sécurité comportant une zone de surface réfléchissante multicolore,
    - la zone de surface réfléchissante multicolore contenant deux structures de réflexion optiquement variables qui sont disposées à différents niveaux de hauteur dans la direction z et qui produisent une impression de couleur différente en réflexion,
    - la structure de réflexion supérieure étant formée par une structure en relief pourvue d'un revêtement en couleur,
    - la structure de réflexion inférieure étant formée par une couche pourvue de pigments à effet réfléchissant en forme de plaquettes qui sont orientés dans l'espace,
    - les deux structures de réflexion se chevauchant dans une zone de chevauchement et le revêtement en couleur de la structure de réflexion supérieure comportant dans la zone de chevauchement au moins un évidement dans lequel la structure de réflexion inférieure apparaît lorsque l'on regarde l'élément de sécurité,
    caractérisé en ce que
    la structure en relief de la structure de réflexion supérieure est formée par un ensemble de micro-miroirs dont les micro-miroirs sont orientés.
  2. Élément de sécurité selon la revendication 1, caractérisé en ce que les pigments à effet en forme de plaquettes représentent des pigments magnétiques pouvant être orientés magnétiquement ou des pigments à effet en forme de plaquettes qui peuvent être orientés par d'autres champs.
  3. Élément de sécurité selon la revendication 1 ou 2, caractérisé en ce que les pigments à effet sont formés par des pigments métallisés, par des pigments pourvus d'un revêtement en couche mince, par des pigments métalliques réfléchissants pourvus d'un revêtement de couleur de lasurage ou par des pigments pourvus de couleurs structurelles.
  4. Élément de sécurité selon l'une au moins des revendications 1 à 3, caractérisé en ce que les pigments à effet sont présents dans une couche d'impression pourvue d'un liant transparent ou translucide et/ou la structure en relief d'une structure de réflexion supérieure est incrustée dans une couche de laque d'incrustation transparente ou translucide.
  5. Élément de sécurité selon l'une au moins des revendications 1 à 4, caractérisé en ce que le revêtement en couleur de la structure de réflexion supérieure est conçu sous la forme d'une trame régulière ou irrégulière pourvue d'éléments de trame et d'espaces de trame intermédiaires, les dimensions des éléments de trame et/ou des espaces de trame intermédiaires étant inférieures à 140 µm au moins dans une direction, de préférence les dimensions des éléments de trame et/ou des espaces de trame intermédiaires étant inférieures à 140 µm, de préférence étant comprises entre 20 µm et 100 µm, notamment entre 20 µm et 60 µm, dans une direction latérale ou les deux.
  6. Élément de sécurité selon la revendication 5, caractérisé en ce que les éléments de trame et les espaces de trame intermédiaires de la trame ont la même forme et de préférence également la même taille, et/ou en ce que la couverture de la trame par les éléments de trame est comprise entre 30 % et 70 %, de préférence entre 40 % et 60 %, notamment autour de 50 %.
  7. Élément de sécurité selon l'une des revendications 1 à 6, caractérisé en ce que, dans la zone de chevauchement, le revêtement en couleur de la structure de réflexion supérieure est appliqué dans des zones partielles qui ont des dimensions latérales supérieures à 140 um, et/ou en ce que le revêtement en couleur de la structure de réflexion supérieure est généré avec des évidements qui ont des dimensions latérales supérieures à 140 µm.
  8. Élément de sécurité selon l'une au moins des revendications 1 à 7, caractérisé en ce que les micro-miroirs orientés sont des miroirs plans, des miroirs concaves et/ou des miroirs de type Fresnel, et/ou les dimensions latérales des micro-miroirs sont inférieures à 20 µm.
  9. Élément de sécurité selon l'une au moins des revendications 1 à 8, caractérisé en ce que le revêtement en couleur est formé de couleurs de lasurage, de métallisations, de structures en couches minces, de couleurs de lasurage adossées à une métallisation, de couleurs luminescentes avec dépôt de couche réfléchissante métallique, de couleurs structurelles et/ou de couleurs de nanoparticules.
  10. Élément de sécurité selon l'une au moins des revendications 1 à 9, caractérisé en ce que, dans la zone de chevauchement, au moins une zone partielle est pourvue d'un marquage négatif dans lequel le revêtement de couleur de la structure de réflexion supérieure et les pigments à effet de la structure de réflexion inférieure sont évidés.
  11. Support de données comprenant un élément de sécurité optiquement variable selon l'une au moins des revendications 1 à 10.
  12. Support de données selon la revendication 11, comprenant un support pourvu de surfaces principales opposées sur chacun desquelles est disposée l'une des deux structures de réflexion optiquement variable, le support étant transparent dans la zone de chevauchement ou contenant une fenêtre de visualisation transparente.
  13. Support de données selon la revendication 10, comprenant un support pourvu de surfaces principales opposées, les deux structures de réflexion optiquement variables étant disposées l'une au-dessus de l'autre sur une surface principale du support.
  14. Procédé de production d'un élément de sécurité optiquement variable, de préférence selon l'une des revendications 1 à 10, dans lequel
    - un support est fourni dont l'extension de surface définit un plan et un axe z perpendiculaire à celui-ci,
    - le support est pourvu d'une zone de surface réfléchissante multicolore qui est formée de deux structures de réflexion optiquement variables qui sont disposées à différents niveaux de hauteur dans la direction z et qui produisent une impression de couleur différente en réflexion,
    - la structure de réflexion supérieure est formée par une structure en relief pourvue d'un revêtement de couleur,
    - la structure de réflexion inférieure est formée par une couche pourvue de pigments à effet réfléchissant en forme de plaquettes qui sont orientés spatialement et
    - les deux structures de réflexion sont formées de manière à se chevaucher dans une zone de chevauchement et le revêtement de couleur de la structure de réflexion supérieure est formé dans la zone de chevauchement avec au moins un évidement dans lequel la structure de réflexion inférieure apparaît lorsqu'on regarde l'élément de sécurité,
    caractérisé en ce que
    la structure en relief de la structure de réflexion supérieure est formée par un ensemble de micro-miroirs dont les micro-miroirs sont orientés.
  15. Procédé selon la revendication 14, caractérisé en ce que, pour former la structure de réflexion inférieure,
    - une couleur d'impression est appliquée avec un liant et des pigments à effet orientables magnétiquement ou par d'autres champs,
    - les pigments à effet sont orientés avec un champ extérieur, notamment un champ magnétique extérieur, alors que le liant est à l'état encore liquide, afin d'obtenir l'orientation spatiale souhaitée, et
    - le liant est solidifié afin de fixer définitivement l'orientation des pigments à effet.
EP20731791.8A 2019-06-06 2020-05-29 Élément de sécurité optiquement variable à zone de surface réfléchissante multicolore Active EP3980273B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019003945.9A DE102019003945A1 (de) 2019-06-06 2019-06-06 Optisch variables Sicherheitselement mit mehrfarbigem reflektivem Flächenbereich
PCT/EP2020/025252 WO2020244805A1 (fr) 2019-06-06 2020-05-29 Élément de sécurité optiquement variable à zone de surface réfléchissante multicolore

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EP3980273A1 EP3980273A1 (fr) 2022-04-13
EP3980273B1 true EP3980273B1 (fr) 2023-11-29

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EP (1) EP3980273B1 (fr)
CN (1) CN113905893B (fr)
DE (1) DE102019003945A1 (fr)
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EP4338854A2 (fr) 2023-12-20 2024-03-20 Sicpa Holding SA Procédés de production de couches à effets optiques

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EP1549505A4 (fr) * 2002-10-07 2006-04-19 Note Printing Au Ltd Dispositifs estampes a couleurs changeantes
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DE102004021246A1 (de) * 2004-04-30 2005-11-24 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
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WO2020244805A1 (fr) 2020-12-10
CN113905893A (zh) 2022-01-07
CN113905893B (zh) 2023-06-27
DE102019003945A1 (de) 2020-12-10
EP3980273A1 (fr) 2022-04-13

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