EP4013625B1 - Élément de sécurité optiquement variable - Google Patents

Élément de sécurité optiquement variable Download PDF

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Publication number
EP4013625B1
EP4013625B1 EP20753875.2A EP20753875A EP4013625B1 EP 4013625 B1 EP4013625 B1 EP 4013625B1 EP 20753875 A EP20753875 A EP 20753875A EP 4013625 B1 EP4013625 B1 EP 4013625B1
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EP
European Patent Office
Prior art keywords
security element
color
relief
color coating
recesses
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
EP20753875.2A
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German (de)
English (en)
Other versions
EP4013625A1 (fr
Inventor
Giselher Dorff
Björn Teufel
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 EP4013625A1 publication Critical patent/EP4013625A1/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
    • B42D25/324—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
    • B42D25/20—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
    • B42D25/351—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

Definitions

  • the invention relates to an optically variable security element for securing valuables, which shows a different visual appearance when the security element is viewed from a top side and an opposite bottom side.
  • the invention also relates to a method for producing such a security element and 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 at the same time 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 object of the invention is to further increase the security against forgery and the visual attractiveness of generic optically variable security elements.
  • optically variable security elements should be provided which, when viewed from opposite directions, each show two or more different appearances or effects in different colors, and which ideally can also be produced easily and cost-effectively.
  • the invention contains an optically variable security element, which shows a different visual appearance when the security element is viewed from an upper side and an opposite underside.
  • the surface extent of the security element defines a plane and a z-axis perpendicular to it.
  • the security element has a multicolored reflective surface area which contains two relief structures which are arranged at different height levels in the z direction and form an upper relief structure which is closer to the top of the security element and a lower relief structure which is closer to the bottom of the security element.
  • the lower relief structure is provided with a lower color coating following the relief gradient and the upper relief structure is provided with an upper color coating following the relief gradient.
  • a translucent colored flat structure is arranged at a height step between the two relief structures.
  • the two relief structures and the flat structure also overlap in an overlap area.
  • the upper colored coating has at least one recess in which, when the security element is viewed from the top, the lower relief structure with the combined color effect of at least the translucent colored flat structure and the lower colored coating appears.
  • the lower colored coating has at least one recess in the overlap area, in which the upper relief structure with the combined color effect of at least the translucent colored flat structure and the upper colored coating appears when the security element is viewed from the underside.
  • the above-mentioned overlap of the structures can be partial or complete, so it is also possible in particular for the two relief structures and the flat structure to be designed to be congruent with one another.
  • the overlap refers to the relative lateral position of the relief structures and the flat structure in the plane defined by the surface extent of the security element.
  • top and bottom refer to the two opposite main sides of the extensive security element in a specific orientation.
  • Security element is applied to a data carrier with its underside first, so that the underside faces towards the data carrier and the top faces away from the data carrier.
  • For a separate data carrier or one embedded in a data carrier Security element can generally be viewed as either the top or the bottom of each of the opposing main sides.
  • the recesses in the upper colored coating and the recesses in the lower colored coating are arranged without overlapping. This means that the lower color coating is visible in the recesses of the upper color coating and the upper color coating is visible in the recesses of the lower color coating. A view through the surface area through aligned recesses in both paint layers is therefore not possible in this embodiment.
  • overlapping recesses are also provided in the two colored coatings, which enable a view through the surface area from one viewing direction.
  • the viewing direction mentioned can be a vertical viewing direction, but also an oblique viewing direction up to a typical angle of up to 60°.
  • the overlapping recesses can in particular be arranged in the form of a grid, such as a dot grid, which forms characters, a pattern or a coding.
  • the grid element size is advantageously chosen to be so small that a view through the overlapping recesses is only possible in one narrow angle range of a few degrees is possible.
  • the motif formed by the grid is therefore only visible in a narrow angular range, providing additional authenticity protection for the security element.
  • the diameter of the grid dots or the grid element size can in particular be below 1 mm or even below 300 ⁇ m.
  • the overlap-free recesses in the upper and lower colored coating are arranged nested in an expedient embodiment, i.e. they alternate with each other several times along the surface extent of the surface area in a nesting area. Within the nesting area, a color change is visible when viewed from both the top and bottom.
  • the recesses in the upper color coating which are arranged without overlap, and the recesses in the lower color coating are arranged in a block-like manner.
  • exactly two separate block areas can be provided, with recesses in a first block area being present exclusively in the upper colored coating and the lower colored coating being formed continuously.
  • recesses in a second block area however, recesses are only present in the lower colored coating, while the upper colored coating is formed continuously. In this way, two independent effect areas are realized in the security element, which only show a color change when viewed from the top (first block area) or only the bottom (second block area).
  • the color effects of the relief structures, the color coatings and the flat structure are coordinated with one another in such a way that the security element when viewed from the top side outside the recesses of the upper color coating shows a first color impression and inside the recesses a second color impression that is different. Furthermore, when viewed from the underside, the security element shows a third color impression outside the recesses of the lower color coating and a fourth color impression that is different from this within the recesses. It has proven to be particularly advantageous if the color effects of the relief structures, the color coatings and the flat structure are coordinated with one another in such a way that all four color prints are different from one another.
  • the color effect of the relief structures includes in particular the color effect of lacquer layers in which the relief structures are molded and the color effect of top coat layers of the relief structures.
  • color effect includes both color and colorlessness.
  • color impression is used for the overall color impression that one or more color-effecting elements create. Specifically, for example, the combination of a colorless, transparent embossed lacquer layer (colorless color effect) with a yellow glazed flat structure (yellow color effect) and a backed aluminum metallization (silvery shiny color effect) creates a shiny yellow color impression. If a translucent blue-colored embossing varnish is used instead of the colorless embossing varnish, the color mixture creates a shiny green color impression.
  • the translucent colored flat structure is advantageously formed by a laminating varnish layer, for example a glazing-colored laminating varnish layer, a colored primer layer or a printed color layer.
  • the translucent colored flat structure can contain, in particular, coloring pigments and/or a dye as colorants.
  • the light transmission of the flat structure is advantageously between 20% and 80%.
  • the translucent colored flat structure is not structured in height, but is flat.
  • the flat structure can in particular be applied directly to a carrier film or to a flat substrate layer, for example a leveling lacquer layer.
  • the upper and/or lower color coating is preferably a reflective color coating, in particular a reflective opaque color coating.
  • One or both color coatings can in particular be formed by metallization, for example of aluminum, silver or an alloy, for example of copper and aluminum, by thin-film structures, in particular color-shifting thin-film structures, gold-blue or silicon-aluminum thin films.
  • the first and/or second color coating can also represent a translucent image made up of several translucent colors, which is backed with an opaque 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 first and/or second color coating can also be formed by structural colors, in particular by nano- and binary structures, which are embossed on or into the micromirrors of a micromirror arrangement.
  • nanoparticle colors can also be considered as color coatings, such as gold-blue particles, various effect pigments, color-shifting pigments or super silver.
  • the upper and/or lower relief structure are advantageously molded in a transparent or glazing-colored embossing lacquer layer.
  • the upper relief structure is transparent Embossing lacquer layer is molded and the lower relief structure is molded in a translucently colored embossing lacquer layer.
  • the upper and/or lower relief structure are leveled with a cover layer, which can also be colored transparent or translucent.
  • the upper relief structure and/or the lower relief structure are particularly advantageously formed by micromirror arrangements with directed micromirrors.
  • the micromirrors are formed in particular by non-diffractive mirrors and do not produce any color splitting. Planar mirrors, concave mirrors and/or Fresnel-like mirrors can preferably be used.
  • the lateral dimensions of the micromirrors are advantageously below 20 ⁇ m, preferably below 10 ⁇ m, but preferably also above 2 ⁇ m, in particular above 3 ⁇ m or even above 5 ⁇ m.
  • other relief structures in particular embossed Fresnel lenses, concave mirrors, hologram structures, nanostructures or diffractive blazed gratings, can also be used instead of micromirrors.
  • the alignment of the micromirrors of the upper relief structure and/or the lower relief structure advantageously varies depending on the location in order to produce a predetermined motif, in particular a three-dimensional motif or a movement motif.
  • the orientation of each micromirror can be freely selected and is essentially determined only by the given motif, but not by the orientation of the neighboring micromirrors.
  • the two relief structures advantageously provide a color change for an unchanged motif depending on the viewing angle or provide a color change together with a motif change.
  • the motives of the two Relief structures can differ in particular in terms of shape (e.g. head, apple or tail), movement (static to moved or moved to static, with linear, rotating and/or pumping movement) and/or dimensionality (2D to 3D, or different three-dimensional to positive or negatively curved appearance or floating in front of or behind a plane) of the motif.
  • the different height levels in which the two relief structures and the flat structure 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 structures involved is not noticeable when looking at the security element.
  • the reference point for the height level of a relief structure is the base area of the relief structure, for example at the base of a micromirror embossing.
  • the upper and/or lower colored coating is designed as a regular or irregular grid with grid elements and grid spaces.
  • the grid spaces represent the above-mentioned recesses of the respective color coating.
  • the dimensions of the grid elements and/or grid spaces are in this variant at least in one direction below 140 ⁇ m.
  • 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 upper and/or lower colored coating advantageously contains recesses which have lateral dimensions of more than 140 ⁇ m.
  • the lateral ones are preferred Dimensions of at least one recess more than 250 ⁇ m, preferably more than 500 ⁇ m and in particular more than 1 mm.
  • the invention also includes a data carrier with an optically variable security element of the type described, the security element being arranged in or above a window area or a continuous opening of the data carrier.
  • two layer structures are produced separately, in which the relief structures mentioned are produced on separate supports and provided with the respective color coating following the relief gradient, and that the two layer structures produced are laminated together via a translucent colored laminating varnish layer, which when laminated together, forms the flat structure of the security element.
  • FIG 1 shows a schematic representation of a banknote 10 with a transparent viewing window 12, over which an optically variable security element 14 according to the invention is arranged.
  • the viewing window 12 can be formed, for example, by a transparent area of a plastic layer or a through opening in a paper layer of the banknote 10.
  • the security element 14 can be viewed from opposite sides, namely both from its top 16 and from its bottom 18, each showing a different visual appearance.
  • Fig. 2 schematically shows a section of the security element 14 applied to the banknote 10 in cross section.
  • the security element 14 With its surface extent, the security element 14 defines an x-y plane and a z-axis perpendicular thereto. Parallel to the xy plane, the security element has a surface area 20, which is different both when viewed from the top 16, i.e. from the positive z-direction, and when viewed from the bottom 18, i.e. from the negative z-direction , multicolored reflective appearance.
  • the security element 14 is applied with its underside 18 to the surface of a transparent plastic substrate via a transparent adhesive layer, not shown.
  • the surface area 20 contains two relief structures 24, 34 and a translucent flat structure 44 arranged between the relief structures.
  • the relief structures 24, 34 are arranged at a height level H P1 or H P2 and the flat structure at a height level H F , whereby the relation H P1 ⁇ H F ⁇ H P2 applies to the height levels.
  • the height levels of the various structures are indicated from the underside of the security element 14, with which it is attached to the banknote 10.
  • the relief structure 24 closer to the bottom is therefore referred to as the lower relief structure 34 and the relief structure 34 closer to the top is referred to as the upper relief structure.
  • the upper relief structure is closer to the viewer than the lower relief structure; when viewed from the bottom of the banknote (viewing position 46), the situation is reversed.
  • the two relief structures each represent micromirror embossings or micromirror arrangements 24, 34, which are each formed from a large number of micromirrors inclined relative to the xy plane.
  • the local angles of inclination of the micromirrors are chosen so that the relief structure of the micromirror arrangements 24, 34 produces a desired optical appearance after the color coating, for example a desired three-dimensional appearance or a desired movement effect when the security element 14 is tilted.
  • the base surfaces or base points of the micromirrors of the micromirror arrangements serve as a reference point for specifying a height level of the micromirror embossings.
  • the micromirror embossings are each formed in an embossing lacquer layer 22 or 32, the embossing lacquer layer 22 of the lower relief structure 24 being colored translucent blue, while the embossing lacquer layer 32 of the upper relief structure 34 is colorlessly transparent.
  • the micromirror arrangements 24, 34 are also each provided with a color coating, which is referred to as the lower color coating 26 or upper color coating 36. In the exemplary embodiment, both color coatings are each formed by an opaque aluminum layer. Both the lower and the upper relief structure are each leveled with a transparent top coat layer 28 and 38, respectively.
  • Both color coatings 26, 36 each have recesses 25, 35, which, despite the continuous micro-mirror embossings 24, 34, allow the viewer to see through partial areas of the structures below and above.
  • the recesses 25, 35 are nested within one another with respect to the xy plane, but are arranged without overlap. This means that within the surface area of the surface area 20, the recesses in the upper and lower color coating alternate several times, but the recesses are coordinated with one another in such a way that there is no visibility through the entire surface area 20, i.e. both at a vertical or oblique viewing angle Recesses 25 in the lower color coating 26, as well as by recesses 35 in the upper color coating 36. Rather, the lower color coating 26 is visible in the recesses 35 of the upper color coating and, conversely, the upper color coating 36 is visible in the recesses 25 of the lower color coating.
  • the flat structure 44 is formed by a continuous, yellow-glazed laminating varnish layer. In contrast to the relief structures 24, 34, the flat structure 44 is not structured in height. In the exemplary embodiment, the two micromirror arrangements 24, 34 and the colored flat structure 44 are arranged one above the other in the entire surface area 20 of the security element 14, so that the overlap area occupies the entire surface area 20.
  • a viewer can look from the top (viewing position 40) in the area of the recesses 35 through the upper micromirror arrangement 34 and the flat structure 44 onto the lower metallized micromirror arrangement 24, 26.
  • the top When viewed from the top, there is an overall color change from silvery to shiny yellow.
  • the viewer looks at the aluminum layer of the upper color coating 36, which creates a shiny silver appearance (reference number 42-1).
  • the viewer looks through the transparent embossing varnish 32 and the flat structure 44 lower color coating 26, so the color effects of the aluminum coating of the lower micromirror arrangement 24 and the yellow glazed flat structure 44 combine to form a shiny yellow appearance (reference number 42-2).
  • the transparent layers top varnish layer 38, embossed varnish layer 32, top varnish layer 28) do not change the color impression.
  • a view through the entire surface area 20 is not possible because the recesses 25 and 35 are arranged without overlap.
  • the viewer looks through the blue glazing embossing varnish 22 and the flat structure 44 onto the upper colored coating 36, so that the color effects of the aluminum coating of the upper micromirror arrangement, the yellow glazing colored flat structure 44 and the blue glazing embossing varnish 22 merge into one combine with a shiny green appearance (reference number 48-2).
  • the transparent layers top lacquer layer 28, embossing lacquer layer 32) do not change the color impression.
  • a view through the entire surface area 20 is also not possible from the underside because of the overlap-free arrangements of the recesses 25, 35.
  • the orientations of the micromirrors of the micromirror arrangements 24, 34 are selected independently of one another, so that the security element 14 generally shows different motifs in addition to the different color effect when viewed from the top 16 and the bottom 18.
  • the security element 14 generally shows different motifs in addition to the different color effect when viewed from the top 16 and the bottom 18.
  • a three-dimensionally bulging value number can be visible
  • a three-dimensionally bulging coat of arms can be visible.
  • the motifs are coordinated with one another in that an overlap of the recesses 25 in the lower color coating (green, shiny appearance on the underside) and the recesses 35 in the upper color coating (yellow, shiny appearance on the top) is avoided.
  • Fig. 2 An overall four-color appearance was created by cleverly coloring the various layers involved, for which purpose in particular the embossing lacquer layer 22 of the lower relief structure 24 was colored with a glaze. In an alternative design, however, this embossing lacquer layer can also be designed to be colorless, transparent. Depending on the design of the color coatings 26, 36, the security element then appears in two or four colors when viewed from the top and bottom.
  • the color effect when viewed from the top 16 is determined by the color effect of the upper color coating 36 (outside the recesses 35) or by the combined color effect of the flat structure 44 and the lower color coating 26 (within the recesses 35), while the color effect when viewed from the underside 18 is due to the color effect of the lower color coating 26 (outside the recesses 25) or by the combined color effect of the flat structure 44 and the upper color coating 36 (within the recesses 25). If the color effects of the color coatings 26, 36 are identical, for example with two similar aluminum layers, the result is a two-tone overall.
  • the color effects of the color coatings 26, 36 are different, for example with a copper layer or gold layer on the one hand and an aluminum layer on the other, four different color impressions result when viewing the security element from the top or bottom (metal1, metal1+ flat structure, metal2, metal2+ flat structure).
  • the exemplary embodiment of the Fig. 3 schematically shows such a design in which, for the sake of clarity, only the color coatings 26, 36 with their recesses and the flat structure 44 are shown.
  • recesses 35 are provided, which lie above non-recessed areas of the lower color coating 26, and in the lower color coating 26 recesses 25 are provided, which are under non-recessed areas Areas of the upper color coating 36 lie.
  • the visual effects already described above result from the viewing directions 50 and 52.
  • recesses 56 of the upper color coating 36 and recesses 58 of the lower color coating 26 are provided, which are arranged in alignment with one another from a predetermined oblique viewing direction 60 and enable a view through the surface area 20 under this oblique viewing direction 60.
  • the recesses 56, 58 are designed in the form of a grid of small dots, which form, for example, a numerical value or a graphic motif. Because of the smallness of the dots (diameter less than 1 mm, or even less than 300 ⁇ m), the recesses are hardly noticeable when viewed vertically or from above. Only when the security element 14 is viewed in transmitted light at a predetermined angle from the viewing direction 60 does the dot grid motif appear through the translucent light and disappear again when the security element is tilted a few degrees out of the viewing direction 60.
  • Figure 4 shows a further exemplary embodiment of a security element 70, which is basically like the security element 14 of Fig. 2 is constructed. However, in contrast to the security element Fig. 2 the recesses 25, 35 of the color coatings 26, 36 are not nested into one another, but rather separated in blocks. Specifically, the security element 70 contains a first block area 72, in which recesses 35 are present exclusively in the upper colored coating 36, while the lower colored coating 26 is formed continuously. Lie in a second block area 74 the recesses 25 only in the lower color coating 26, while the upper color coating 36 is formed continuously.
  • the security element 70 when viewed from the top, shows the above-described color change from silver to shiny yellow, while when viewed from the bottom there is no color change, but only the combined, shiny blue appearance of the embossing lacquer layer 22 and the continuous lower color coating 26 shows.
  • the security element 70 when viewed from the underside, shows the already described color change from blue to shiny green, while when viewed from the top there is no color change, but only the silvery appearance of the continuous color coating 36.

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Claims (15)

  1. Élément de sécurité (14) à variation optique destiné à protéger des objets de valeur, qui, lorsqu'on observe l'élément de sécurité (14) depuis une face supérieure (16) et depuis une face inférieure (18) opposée, présente respectivement un aspect visuel différent, dans lequel
    - l'extension surfacique de l'élément de sécurité (14) définit un axe z perpendiculaire à celui-ci,
    - l'élément de sécurité (14) présente une zone surfacique (20) réfléchissant des couleurs multiples,
    - la zone surfacique (20) réfléchissant des couleurs multiples contient deux structures en relief (24, 34) agencées à différents niveaux de hauteur dans la direction z et formant une structure en relief (34) supérieure située plus près de la face supérieure (16) de l'élément de sécurité (14) et une structure en relief (24) inférieure située plus près de la face inférieure (18) de l'élément de sécurité (14),
    - la structure en relief (24) inférieure est pourvue d'un revêtement coloré inférieur (26) qui suit le tracé du relief et la structure en relief (34) supérieure est pourvue d'un revêtement coloré supérieur (36) qui suit le tracé du relief,
    - dans la direction z, à un niveau de hauteur entre les deux structures en relief, une structure plate (44) translucide est agencée, les deux structures en relief et la structure plate (44) se chevauchant dans une zone de chevauchement,
    - le revêtement coloré supérieur (36) présente, dans la zone de chevauchement, au moins une ouverture (35) et
    - le revêtement coloré inférieur (26) présente, dans la zone de chevauchement, au moins une ouverture (25),
    caractérisé en ce que
    la structure plate (44) translucide est une structure plate (44) translucide colorée,
    dans l'ouverture (35) du revêtement coloré supérieur (36), lorsqu'on observe l'élément de sécurité (14) depuis la face supérieure (16), la structure en relief (24) inférieure apparaît avec l'effet de couleur combiné au moins de la structure plate (44) translucide colorée et du revêtement coloré inférieur (26) et
    dans l'ouverture (25) du revêtement coloré inférieur (26), lorsqu'on observe l'élément de sécurité (14) depuis la face inférieure (18), la structure en relief (34) supérieure apparaît avec l'effet de couleur combiné au moins de la structure plate (44) translucide colorée et du revêtement coloré supérieur (36).
  2. Élément de sécurité (14) selon la revendication 1, caractérisé en ce que les ouvertures (35) dans le revêtement coloré supérieur (36) et les ouvertures (25) dans le revêtement coloré inférieur (26) sont agencées sans se chevaucher.
  3. Élément de sécurité (14) selon la revendication 2, caractérisé en ce que, outre les ouvertures (35, 25) agencées sans se chevaucher dans le revêtement coloré inférieur et supérieur (36, 26), des ouvertures qui se chevauchent sont également prévues dans les deux revêtements colorés, lesquelles ouvertures permettent, à partir d'une direction d'observation, une vue à travers la zone surfacique (20), les ouvertures qui se chevauchent étant de préférence agencées sous forme d'une grille de points, qui forme des caractères, un motif ou un codage.
  4. Élément de sécurité (14) selon au moins l'une des revendications 2 à 3, caractérisé en ce que les ouvertures (35, 25) agencées sans se chevaucher du revêtement coloré supérieur et inférieur (36, 26) sont disposées de manière imbriquée.
  5. Élément de sécurité (14) selon au moins l'une des revendications 2 à 3, caractérisé en ce que les ouvertures (35, 25) agencées sans se chevaucher (35, 25) dans le revêtement coloré supérieur et inférieur (36, 26) sont agencées de manière séparée sous forme de blocs.
  6. Élément de sécurité (14) selon au moins l'une des revendications 1 à 5, caractérisé en ce que les effets de couleur des structures en relief, des revêtements colorés et de la structure plate (44) sont adaptés les uns aux autres de telle sorte que l'élément de sécurité (14) présente, lorsqu'il est observé à partir de la face supérieure (16), en dehors des ouvertures (35) du revêtement coloré supérieur (36), une première impression de couleur et, au sein des ouvertures (35), une deuxième impression de couleur différente de la première et, lorsqu'il est observé à partir de la face inférieure (18), en dehors des ouvertures (25) du revêtement coloré inférieur (26), une troisième impression de couleur et, au sein des ouvertures (25), une quatrième impression de couleur différente de la troisième.
  7. Élément de sécurité (14) selon la revendication 6, caractérisé en ce que les effets de couleur des structures en relief, des revêtements colorés et de la structure plate (44) sont adaptés les uns aux autres de telle sorte que les quatre impressions de couleur sont différentes les unes des autres.
  8. Élément de sécurité (14) selon au moins l'une des revendications 1 à 7, caractérisé en ce que
    la structure plate (44) est formée par une couche de vernis contrecollée, une couche d'apprêt ou une couche colorée imprimée et/ou
    la structure plate (44) contient, en tant que colorant, des pigments conférant une couleur et/ou un colorant.
  9. Élément de sécurité (14) selon au moins l'une des revendications 1 à 8, caractérisé en ce que le revêtement coloré inférieur et/ou supérieur (36, 26) est/sont des revêtements colorés réfléchissants, en particulier un revêtement coloré réfléchissant, opaque, et de préférence formé(s) par des métallisations, par des structures stratifiées minces, par des peintures semi-transparentes déposées par métallisation, par des peintures luminescentes comportant un effet miroir métallique, par des peintures structurées et/ou par des peintures à nanoparticules.
  10. Élément de sécurité (14) selon au moins l'une des revendications 1 à 9, caractérisé en ce que la structure en relief supérieure et/ou inférieure (34, 24) est/sont formée(s) dans une couche de vernis gaufrée (32, 22) colorée transparente ou semi-transparente, en particulier en ce que la structure en relief (34) supérieure est formée dans une couche de vernis gaufrée (32) transparente et la couche en relief (24) inférieure est formée dans une couche de vernis gaufrée (22) colorée semi-transparente.
  11. Élément de sécurité (14) selon au moins l'une des revendications 1 à 10, caractérisé en ce que la structure en relief (34) supérieure et/ou la structure en relief (24) inférieure est/sont formée(s) par des agencements de micromiroirs comportant des micromiroirs orientés, en particulier comportant des miroirs sans effet diffractif, et de préférence comportant des miroirs plans, des miroirs creux et/ou des miroirs de type Fresnel.
  12. Élément de sécurité (14) selon au moins l'une des revendications 1 à 11, caractérisé en ce que l'orientation des micromiroirs de la structure en relief (34) supérieure et/ou de la structure en relief (24) inférieure varie en fonction de la position d'un motif respectivement prédéterminé, en particulier un motif à effet tridimensionnel ou un modèle de mouvement.
  13. Support de données (10) comportant un élément de sécurité (14) à variation optique selon au moins l'une des revendications 1 à 12, dans lequel l'élément de sécurité (14) est agencé dans ou sur une zone de fenêtre (12) ou une ouverture traversante du support de données (10).
  14. Procédé destiné à fabriquer un élément de sécurité (14) à variation optique, dans lequel
    - un substrat est fourni, dont l'extension surfacique définit un plan et un axe z perpendiculaire à celui-ci,
    - le substrat est pourvu d'une zone surfacique (20) réfléchissant des couleurs multiples contenant deux structures en relief (34, 24) qui sont agencées à des niveaux de hauteur différents dans la direction z et qui forment une structure en relief supérieure et inférieure (34, 24),
    - la structure en relief (24) inférieure est pourvue d'un revêtement coloré inférieur (26) qui suit le tracé du relief et la structure en relief (34) supérieure est pourvue d'un revêtement coloré supérieur (36) qui suit le tracé du relief,
    - dans la direction z à un niveau de hauteur entre les deux structures en relief (34, 24), une structure plate (44) colorée translucide est agencée, les deux structures en relief (34, 24) et la structure plate (44) étant conçues de manière à se chevaucher dans une zone de chevauchement et
    - le revêtement coloré supérieur (36) est formé dans la zone de chevauchement avec au moins une ouverture (35) dans laquelle, lorsqu'on observe l'élément de sécurité (14) depuis la face supérieure (16), la structure en relief (24) inférieure apparaît avec l'effet de couleur combiné au moins de la structure plate (44) colorée translucide et du revêtement coloré inférieur (26) et
    - le revêtement coloré inférieur (26) est formé dans la zone de chevauchement avec au moins une ouverture (25) dans laquelle, lorsqu'on observe l'élément de sécurité (14) depuis la face inférieure (18), la structure en relief (34) supérieure apparaît avec l'effet de couleur combiné au moins de la structure plate (44) translucide colorée et du revêtement coloré supérieur (36).
  15. Procédé selon la revendication 14, caractérisé en ce
    qu'un élément de sécurité selon l'une des revendications 1 à 12 est fabriqué ; et/ou
    deux structures stratifiées sont générées séparément, dans lesquelles les structures en relief mentionnées sont créées sur des supports séparés et sont pourvues du revêtements coloré respectif, suivant le tracé du relief, et en ce que les deux structures stratifiées générées sont stratifiées conjointement par l'intermédiaire d'une couche de vernis contrecollée colorée translucide, qui forme, dans l'état stratifié, la structure plate (44) de l'élément de sécurité (14).
EP20753875.2A 2019-08-14 2020-08-07 Élément de sécurité optiquement variable Active EP4013625B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019005705.8A DE102019005705A1 (de) 2019-08-14 2019-08-14 Optisch variables Sicherheitselement
PCT/EP2020/025366 WO2021028076A1 (fr) 2019-08-14 2020-08-07 Élément de sécurité optiquement variable

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EP4013625A1 EP4013625A1 (fr) 2022-06-22
EP4013625B1 true EP4013625B1 (fr) 2023-11-22

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CN (1) CN113950414B (fr)
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DE102021002448A1 (de) * 2021-05-07 2022-11-10 Giesecke+Devrient Currency Technology Gmbh Mehrschichtkörper und Verfahren zum Herstellen desselben
DE102022002470A1 (de) 2022-07-06 2024-01-11 Giesecke+Devrient Currency Technology Gmbh Optisch variables Flächenmuster, Wertdokument mit optisch variablem Flächenmuster und Verfahren zur Herstellung eines optisch variablen Flächenmusters
DE102022002839A1 (de) 2022-08-04 2024-02-15 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement für ein Wertdokument mit optisch variablem Primärflächenmuster und verstecktem Sekundärflächenmuster und Verfahren zu dessen Herstellung
DE102023103092A1 (de) * 2023-02-08 2024-08-08 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement mit Transmissions- und Reflexionsbereich

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Publication number Priority date Publication date Assignee Title
GB2250474B (en) * 1990-12-04 1994-04-20 Portals Ltd Security articles
CH691750A5 (de) * 1995-11-28 2001-09-28 Ovd Kinegram Ag Optischer Informationsträger.
DE10032128A1 (de) * 2000-07-05 2002-01-17 Giesecke & Devrient Gmbh Sicherheitspapier und daraus hergestelltes Wertdokument
DE10226114A1 (de) * 2001-12-21 2003-07-03 Giesecke & Devrient Gmbh Sicherheitselement für Sicherheitspapiere und Wertdokumente
DE102008049631A1 (de) * 2008-09-30 2010-04-01 Giesecke & Devrient Gmbh Karte mit eingebettetem Sicherheitsmerkmal
DE102009031387A1 (de) * 2009-07-01 2011-01-05 Giesecke & Devrient Gmbh Sicherheitselement und Herstellungsverfahren dafür
FR3021583B1 (fr) * 2014-05-30 2021-10-22 Hologram Ind Composant optique de securite personnalisable pour la fabrication d'un document de securite personnalise et fabrication d'un tel composant
DE102016014662A1 (de) * 2016-12-09 2018-06-14 Giesecke+Devrient Currency Technology Gmbh Wertdokument

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CN113950414A (zh) 2022-01-18
WO2021028076A1 (fr) 2021-02-18
CN113950414B (zh) 2023-03-28
EP4013625A1 (fr) 2022-06-22

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