EP3954543B1 - Élément de sécurité optique variable - Google Patents

Élément de sécurité optique variable Download PDF

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Publication number
EP3954543B1
EP3954543B1 EP21020303.0A EP21020303A EP3954543B1 EP 3954543 B1 EP3954543 B1 EP 3954543B1 EP 21020303 A EP21020303 A EP 21020303A EP 3954543 B1 EP3954543 B1 EP 3954543B1
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EP
European Patent Office
Prior art keywords
layer
relief structure
reflection
security element
relief
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.)
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EP21020303.0A
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German (de)
English (en)
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EP3954543A1 (fr
Inventor
Andreas Rauch
Michael Rahm
Tobias Sattler
Kai Herrmann SCHERER
Winfried HOFFMÜLLER
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Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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Publication of EP3954543A1 publication Critical patent/EP3954543A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—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
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • 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
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B42D15/0053—Forms specially designed for commercial use, e.g. bills, receipts, offer or order sheets, coupons
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/24—Passports
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F1/00—Designs or pictures characterised by special or unusual light effects
    • B44F1/02—Designs or pictures characterised by special or unusual light effects produced by reflected light, e.g. matt surfaces, lustrous surfaces

Definitions

  • the invention relates to an optically variable security element for protecting valuables, whose surface area defines a z-axis perpendicular thereto, with a reflective surface area that shows at least two appearances recognizable from different viewing directions.
  • 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 value or ID documents, but also other valuables, such as branded items, are often provided with security elements for protection, 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 onto a document of value.
  • Security elements with a viewing angle-dependent or three-dimensional appearance play a special role in authenticity protection, as these cannot be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and/or a different graphic motif depending on the viewing angle.
  • the prior art describes, for example, movement effects, pump effects, depth effects or flip effects as optically variable effects, which are realized with the aid of holograms, microlenses or micromirrors.
  • optically variable security elements which have two relief structures arranged at different height levels and each provided with a color coating (see Fig WO 2020/011390 A1 , WO 2020/011391 A1 and WO 2020/011391 A2 ).
  • the color coating of the higher-lying relief structure is either structured as a grid or provided with gaps, so that the color coating of the deeper-lying relief structure appears in the grid gaps or gaps when viewing the security element.
  • the invention is based on the object of specifying generic optically variable security elements which can be produced with a small total thickness with independently selectable colors of the visually recognizable appearances and which ideally require a small number of work steps during production.
  • the invention contains an optically variable security element with a reflective surface area, which can be used in particular to protect valuables.
  • the reflective surface area shows at least two appearances recognizable from different viewing directions.
  • the surface extent of the security element defines a plane and a z-axis perpendicular to the surface.
  • the reflective surface area contains two relief structures which are arranged at least partially overlapping one another in the z-direction at different height levels and form a first (lower lying) and a second (higher lying) relief structure.
  • the second relief structure includes an embossing layer.
  • the second relief structure is only provided in partial areas of the reflective surface area, so that the surface area has the partial areas with a reflective second relief structure and free areas without a reflective second relief structure.
  • the embossed layer is only provided in the partial areas of the reflective surface area, but not in the free areas.
  • the reflection-increasing layer of the second relief structure is formed by floating or sunken pigments.
  • the orientation of platelet-shaped pigments in a dispersion medium is based on a complex interplay of various factors, such as the viscosity of the dispersion medium or the shrinkage of the dispersion medium during drying.
  • the pigments in the dispersion medium can be aligned essentially parallel to the surface of the dispersion medium.
  • Floating pigments also known as leafing pigments
  • dispersing pigments also referred to as non-leafing pigments
  • Another type of pigment referred to in this specification as a sagging pigment, moves away from the surface of the dispersing medium after application.
  • the different movement behavior of the pigments is a consequence of the different wetting behavior of the pigments.
  • Leafing pigments have a high interfacial energy between the pigment and the dispersion medium, the pigments are therefore hardly wetted by the medium and float in the wet film towards the air, where the interfacial energy is lower.
  • the dispersing (non-leafing) pigments are completely wetted by the dispersing medium and therefore disperse substantially evenly throughout the medium.
  • Floating pigments can be produced, for example, by adding stearic acid as a lubricant in the milling step during production of the pigments.
  • the second relief structure preferably comprises a color layer.
  • the floating or sunken pigments form the reflection-increasing layer of the second relief structure.
  • the reflection-increasing layer of the second (higher) relief structure is particularly preferably formed by floating pigments, which are aligned in such a way that they follow the relief profile of the second (higher) relief structure.
  • the first/second relief structure is sometimes abbreviated or also referred to below as the lower/higher relief structure.
  • the second (higher) relief structure is formed by an embossing lacquer layer, on the relief-structured side of which a surface layer of aligned floating pigments forms the reflection-increasing layer of the (second) higher relief structure.
  • This embossing lacquer layer of the second (higher) relief structure can either be colorless transparent or be colored in a translucent manner.
  • the second relief structure can be formed by an embossing lacquer layer, on the relief-structured side of which a surface layer made of the floating or sunken pigments forms the reflection-increasing layer of the second relief structure.
  • pigments that have floated or sunken in a reflection-increasing, preferably reflective, color layer form the reflection-increasing layer of the second relief structure.
  • the second relief structure can be formed by an embossing layer and a reflection-increasing color layer.
  • a surface layer made of the pigments that have floated or sunken in the reflection-increasing color layer forms the reflection-increasing layer of the second relief structure.
  • the two sides of the reflection-increasing color layer preferably follow a relief profile of the second relief structure.
  • the reflection-increasing layer can be arranged either on the side facing the embossed layer or on the side facing away from the embossed layer. Further preferably or alternatively, the embossed layer and the reflection-increasing color layer can be embossed together.
  • only the side of the reflection-increasing color layer that faces the embossing layer can follow a relief profile of the second relief structure.
  • only the embossed layer can be embossed and the reflection-increasing color layer is applied to the embossed embossed layer in the partial areas.
  • the floating or sinking pigments can be optically variable pigments; and/or anisotropic pigments, which are aligned following the relief course of the second relief structure, and/or which have a largest dimension below the lateral structure dimensions of the second relief structure.
  • the floating or sinking pigments have lateral dimensions that are at most a factor of 5 larger than the embossed relief structures. Pigments whose lateral dimensions are similar in size to the relief structures are particularly suitable. The pigments can advantageously also be up to a factor of 10 smaller than the embossed relief structures.
  • the floating or sinking pigments are, in particular, anisotropic. They are therefore not spheres, but are designed with different dimensions in different directions in space.
  • the floating or sinking pigments are advantageously in the form of flakes, the aspect ratio, ie the ratio of edge length to thickness of the flakes, being preferably more than 5:1, in particular more than 10:1.
  • the second (higher) relief structure and/or the first (lower) relief structure are formed by micromirror arrangements with specularly reflecting micromirrors, in particular with non-diffractive mirrors, and preferably with planar mirrors, concave mirrors and/or Fresnel-like mirrors .
  • the lateral dimensions of the micromirrors are expediently below 50 ⁇ m, advantageously at or below 20 ⁇ m, preferably at about 10 ⁇ m, ie between 7 ⁇ m and 13 ⁇ m.
  • the lateral dimensions of the micromirrors are also above 2 ⁇ m, in particular above 3 ⁇ m or even above 5 ⁇ m.
  • the pitch of the micromirrors is preferably less than 10 ⁇ m, preferably less than 5 ⁇ m.
  • the lateral structure dimensions discussed above are given by the lateral dimensions of the micromirrors. If, for example, the micromirrors of the higher relief structure have a length of 10 ⁇ m and a width of 15 ⁇ m, the largest dimension of the floating or sinking pigments should be less than 10 ⁇ m (the smaller of the length and width of the micromirrors), in particular below 6.67 ⁇ m (factor 1.5) or even below 5 ⁇ m (factor 2).
  • embossed relief structures in particular Fresnel lenses, concave mirrors, convex lenses such as lens caps, hologram structures, nanostructures or diffractive blazed gratings can also be used instead of micromirrors.
  • achromatic diffraction gratings so-called matte structures, can also be used reflect white light.
  • the relief structures of at least the second relief structure can also have sub-wavelength structures, in particular sub-wavelength gratings, or interference structures which, in combination with the respective reflection-enhancing layer, determine or at least co-determine the color thereof.
  • the second (higher) relief structure is designed and formed to show a first optically variable effect in a first color
  • the first (lower) relief structure is designed and formed in the free areas a second optically variable effect in a second to show different color.
  • the different color effects can be produced in different ways, with advantageous variants being described in more detail below.
  • the first (deeper) relief structure itself is advantageously shaped in an embossing lacquer layer, which can be colorless transparent or glazing colored, and on which the reflection-increasing layer is applied following the course of the relief. It is also possible to provide a color layer for the first relief structure that does not follow the course of the relief.
  • the embossing lacquer layer of the underlying relief structure in the finished security element preferably lies above the reflection-enhancing layer, so that the viewer looks through the embossing lacquer layer at its reflection-enhancing coating. The color effect of the underlying relief structure then results from the interaction of the coloring of the embossing lacquer layer and the color of the reflection-increasing layer.
  • the second (higher) relief structure is advantageously shaped in an embossing lacquer layer, which can be colorless transparent or transparent or colored, and on its relief-structured side a surface layer of aligned anisotropic pigments forms a reflection enhancing layer.
  • the embossing lacquer layer of the higher-lying relief structure in the finished security element preferably lies above the reflection-enhancing layer, so that the viewer looks through the embossing lacquer layer at its reflection-enhancing surface layer.
  • the color effect of the higher relief structure results from the interaction of the coloring of the embossing lacquer layer and the color of the reflection-increasing surface layer.
  • the coloring of the embossing lacquer layers can be provided in particular by translucent colors, luminescent colors or nanoparticle colors, for example based on gold-blue particles.
  • the reflection-increasing layer of the first (deeper) relief structure is advantageously formed by a reflective color coating, in particular by a metallization, a thin-layer structure, by a glazing color deposited with a metallization, by a luminescent color with a metallic mirror coating, by a structural color and/or through a nanoparticle paint.
  • the reflection-increasing layer of the lower-lying relief structure is particularly advantageously formed by a vapor-deposited layer that is deposited, for example, in a CVD or PVD process.
  • the floating or sinking pigments are advantageously formed by pigments that reflect substantially uniformly over the entire visible spectral range, such as aluminum or silver pigments. Such pigments themselves appear essentially colorless, so that the color effect of the higher-lying relief structure is provided in this case by the coloring of the base embossing varnish of the embossing varnish layer.
  • the floating or sinking pigments have an uneven reflection in the visible spectral range and thus a visually visible inherent color.
  • the pigments can be copper or gold pigments with a reddish or gold inherent color.
  • a color effect of the higher-lying relief structure can also be achieved when using a colorless base embossing varnish.
  • the partial (or paint) areas and free areas are formed at least in a partial area of the surface area as a regular or irregular grid with grid elements and grid spaces, with the dimensions of the grid elements (and grid spaces) in one or both lateral directions below of 140 ⁇ m, preferably between 20 ⁇ m and 100 ⁇ m, in particular between 20 ⁇ m and 60 ⁇ m.
  • the security element advantageously shows an appearance when tilted or a corresponding change in the viewing direction that suddenly jumps from a first to a second appearance (or when tilted back from the second to the first appearance).
  • the motif shown e.g. value number or coat of arms
  • the color e.g. yellow or blue
  • Such an appearance that changes seamlessly between two different motifs with two different colors is referred to in this description as a binary color and effect change.
  • the grid formed by the partial (or lacquer) areas and free areas advantageously has a constant area coverage by the grid elements, which is expediently between 30% and 70%, preferably between 40% and 60%, in particular around 50%.
  • the partial (or paint) areas and free areas are formed as an effect area at least in a partial area of the surface area, in which the partial areas and/or the free areas have lateral dimensions of more than 140 ⁇ m.
  • the security element preferably shows two different effects (for example a three-dimensional motif and a movement effect such as a moving bar), which appear in two different colors.
  • the areas with different color impressions and different effects are registered exactly to one another, which is also referred to below as color-to-effect registration.
  • At least one partial (or paint) area and/or at least one free area is advantageously formed with lateral dimensions of more than 250 ⁇ m, preferably more than 500 ⁇ m and in particular more than 1 mm.
  • the reflection-increasing layer of the lower-lying relief structure completely covers it.
  • negative identifiers can also be provided in the security element, which are formed by gaps in the reflection-increasing layer.
  • the negative indicators can form text, symbols or value numbers, for example.
  • Negative markings can be provided in the raster areas that are formed by the paint areas and free areas mentioned. As a rule, however, they appear visually less attractive there, since the line width of the negative number plate is usually larger than the grid of the higher embossing layer, so that the viewer may be able to see the printed grid of the negative number plate.
  • negative license plates can be integrated very well into the effect areas with color-to-effect registration because of the larger dimensions of the paint areas and free areas.
  • negative markings are advantageously only provided in the free areas of the surface area in which only the second relief structure is present.
  • Transparent, colorless negative markings result from configurations in which a colorless, transparent embossing lacquer is provided with a colored metallization, for example a copper or gold layer, for the second relief structure. If, on the other hand, the color effect of the second relief structure is determined or partly determined by the coloring of the embossing varnish, colored negative marks appear in the recesses of the reflection-enhancing layer, the color of which is determined by the transparency color of the embossing varnish.
  • the reflective surface area of the security element described can be combined with other security features, for example with holograms, in particular real-color holograms, with sub-wavelength gratings or other sub-wavelength structures, with micromirror arrays without diffractive gratings, or with security features that special material properties such as electrical conductivity, magnetic properties, luminescence, fluorescence or the like are based.
  • the optically variable security element can contain further layers, such as a protective, covering or an additional functional layer, a primer layer or a heat-sealing lacquer layer.
  • a protective, covering or an additional functional layer such as a primer layer or a heat-sealing lacquer layer.
  • the invention also includes a data carrier with a security element of the type described.
  • the data carrier can in particular be a document of value, such as a banknote, in particular a paper banknote, a polymer banknote or a foil composite banknote, a share, a bond, a certificate, a voucher , a check, a premium ticket, but also an identification card, such as a credit card, a bank card, a cash card, an authorization card, an ID card or a passport personalization page.
  • the invention also includes a method for producing an optically variable security element with a reflective surface area that shows at least two appearances recognizable from different viewing directions.
  • a carrier is provided, the surface extent of which defines a plane and a z-axis perpendicular thereto.
  • the carrier is provided with a reflective surface area that contains two relief structures that are arranged at least partially overlapping one another in the z-direction at different height levels and form a first and a second relief structure.
  • the first relief structure becomes a reflection-increasing structure following its relief profile provided layer.
  • the second relief structure is provided with a reflection-increasing layer that follows the course of its relief.
  • the second relief structure includes an embossing layer.
  • the embossed layer is only provided in partial areas of the reflective surface area, but not in free areas.
  • the second relief structure is provided only in the partial areas of the reflective surface area.
  • the surface area has the partial areas with a reflective second relief structure and the free areas without a reflective second relief structure.
  • floating or sinking pigments form the reflection-increasing layer of the second relief structure.
  • the floating or sinking pigments are advantageously anisotropic pigments which align themselves along the course of the relief as they float or sink.
  • the designations “lower-lying relief structure” and “higher-lying relief structure” relate to the position of the relief structures in the finished security element relative to an observer. The designations therefore do not reflect the order in which the relief structures were applied during manufacture. Since the security element is designed in particular for viewing from the side of the carrier, the (later) higher-lying relief structure is generally first produced on the provided carrier during production and then the (later) lower-lying relief structure is then produced thereon.
  • the second relief structure is created first and then the first relief structure.
  • one layer is used to form the second lying relief structure with the reflection-increasing layer applied to the carrier from a pigment embossing varnish which is a dispersion of platelet-shaped floating pigments in a base embossing varnish.
  • the desired relief structure is then advantageously embossed into the applied pigment embossing lacquer, the floating pigments being aligned by embossing along the course of the relief structure, so that a reflection-increasing surface layer with aligned pigments is formed on the surface of the pigment embossing lacquer layer.
  • figure 1 shows a schematic representation of a banknote 10 with an optically variable security element 12 according to the invention in the form of an adhesively bonded transfer element.
  • the invention is not limited to transfer elements and banknotes, but can be used with all types of security elements, for example labels on goods and packaging or to protect documents, ID cards, passports, credit cards, health cards and the like.
  • security threads for example, can also be considered.
  • the security element 12 applied to the banknote 10 is itself very flat, but nevertheless gives the viewer the three-dimensional impression of a motif 14 apparently arching out of the plane of the banknote 10 and appearing in a first color.
  • the motif 14 can, for example, be a denomination, a portrait or some other represent a graphic motif.
  • a movement effect in a second color is visible in a partial area 16 within the motif 14 .
  • a bright bar can move back and forth along the curved partial area 16 and produce a so-called rolling bar effect.
  • the areas with different colors (first and second color) and different effects (three-dimensional motif or running bar) are precisely matched to each other. This registration is also referred to below as color-to-effect registration.
  • the security element 12 with reference to the cross section of the 2 a flat transparent carrier 18, the surface extent of which defines an xy plane and a z-axis perpendicular thereto.
  • a multicolored reflective surface area 20 is arranged on the carrier 18, which contains two embossed structures 24, 34, which are arranged in the z-direction at two different height levels in relation to the planar carrier 18.
  • the different height levels of the embossed structures 24, 34 are defined by the different heights of the base areas of the micromirror arrangements 24, 34 above the carrier 18.
  • the two embossed structures 24, 34 are each embossed into an embossing lacquer layer 22, 32, which can be colorless, transparent or colored, depending on the desired color effects.
  • the embossed structures each represent embossed micromirrors or micromirror arrangements 24, 34, which are each formed from a multiplicity of micromirrors inclined with respect to the xy plane.
  • the local angles of inclination of the micromirrors are selected in such a way that the relief structure of the micromirror arrangements 24, 34 together with the respective reflection-increasing layer produces a desired optical appearance, such as the arched three-dimensional impression of the motif 14 or the rolling bar effect of the partial area 16.
  • the micromirror arrangements 24, 34 are each provided with a reflection-enhancing layer 26, 36 on the one hand, and on the other hand the embossing lacquer layers 22, 32 can also be colored and thus together with the reflection-enhancing layers 26 , 36 produce a desired color effect of the respective micromirror array.
  • the security element 12 of 2 is designed for viewing from above (or in reflection), ie for viewing through the transparent carrier 18 .
  • the micromirror array 24 farther from the viewer is therefore referred to as the lower micromirror array and the micromirror array 34 closer to the viewer is referred to as the higher micromirror array.
  • the carrier 18 can remain in the security element after the security element 12 has been applied to a target substrate (as in 2 ), but it can also be deducted. In the latter case, of course, the support does not have to be transparent.
  • the two micromirror arrangements 24, 34 are arranged one above the other, with the higher-lying micromirror arrangement 34 having at least one large-area recess 42, for example in the form of a 5 mm wide and 2 cm long curved strip ( 1 ).
  • the viewer looks at the lower-lying micro-mirror arrangement 24 with the reflection-enhancing layer 26, while the visual impression of the surface area 20 in the area 44 outside of the recess 42 is determined by the higher-lying micro-mirror arrangement 34 with the reflection-enhancing layer 36.
  • the reflection-increasing layer 26 is formed by a full-area vapor-deposited layer that was vapor-deposited onto the embossing lacquer layer 22 after it had been applied and embossed.
  • the reflection-increasing layer 36 is not a layer that is applied later, but represents a surface layer of the embossing lacquer layer 32 with a large number of aligned, reflective, platelet-shaped pigments 38 that follows the relief process.
  • This surface layer is created by the special properties of the pigments used and the work steps in production that are tailored to them , as linked below 3 described in more detail.
  • the viewer When viewing the security element 12 in reflection, the viewer perceives the motif 14 generated by the micromirror arrangement 34 with a first color in the areas 44 outside of the recess 42, which is determined by the color of the aligned pigments 38 of the surface layer 36 and the color of the embossing lacquer layer 32 is determined.
  • a movement effect occurs within the recess 42, in which, for example, when the bank note 10 is tilted, a light bar of a second color appears within the curved partial area 16 ( 1 ) seems to run back and forth.
  • the second color is determined by the color of the vapor deposition layer 26 and the color of the embossing lacquer layer 22 .
  • the height difference between the two micromirror arrays 24, 34 is in the range of a few micrometers or a few tens of micrometers and is therefore imperceptible to the viewer.
  • the two differently colored motifs and the different effects 14, 16 therefore appear to the viewer to be arranged in exact register with one another.
  • the surface extent of the carrier 18 defines an xy plane and a z-axis perpendicular thereto.
  • a first embossing lacquer layer 32 made of a pigment embossing lacquer 30 is applied to the surface in desired partial areas, which represents a dispersion of platelet-shaped floating metal pigments 38 in a base embossing lacquer 31.
  • the floating pigments 38 are aluminum pigments that reflect in the entire spectral range, and the base embossing lacquer 31 is glazed with a desired first color.
  • the floating pigments 38 themselves can have a desired coloring and can be formed, for example, by copper or gold pigments, while the base embossing lacquer is transparent and colorless.
  • the leafing pigments 38 in the base embossing lacquer 31 float to the surface of the applied embossing lacquer layer 32, as in FIG 3(a) shown.
  • the embossing lacquer layer 32 is then provided with a first embossing in the form of the desired micromirror embossing 34 .
  • the pigments 38 are aligned along the course of the embossed structure by the embossing due to their floating properties, as in FIG 3(b) shown.
  • a reflection-increasing surface layer 36 with aligned pigments 38 thus arises on the surface of the embossing lacquer layer 32, which largely follows the relief profile of the micromirror embossing 34.
  • the free areas 54 correspond to the desired recesses 42 in the finished security element ( 2 ), the lacquer areas 52 the desired areas 44 outside of the recesses 42.
  • a full-surface second embossing lacquer layer 22 is then applied to the structure formed in this way and this second embossing lacquer layer 22 is provided with a second embossing in the form of the desired micromirror embossing 24, as shown in FIG 3(c) shown.
  • Both the first and the second embossing lacquer layer are preferably applied by means of screen printing, offset printing, flexographic printing or gravure printing.
  • UV varnish, a thermoplastic varnish or a dual cure system i.e. a combination of UV embossing varnish and thermoplastic varnish, can be used as the base embossing varnish 31 of the pigment embossing varnish 30 and as the embossing varnish for the second embossing varnish layer 22 .
  • the surface area 20 is then metallized over the entire surface using a PVD method, for example, and is thereby provided with a vapor-deposited layer 26 that follows the relief profile of the second micromirror embossing 24, as shown in FIG 3(d) shown.
  • the double embossing structure produced in this way is applied to the target substrate, for example the banknote paper of the banknote 10, via an adhesive layer 28, as shown in FIG 2 shown.
  • primer layers, protective layers and/or a machine-readable magnetic layer can be located between the full-surface vapor deposition layer 26 and the adhesive layer 28 .
  • the surface area 20 of the security element according to the invention can be produced with two colors which can be selected completely independently of one another.
  • the number of operations required is low and the overall thickness of the security element can be kept small.
  • the layer thickness of the security element is 2 below 45 ⁇ m.
  • the security elements described can be provided with negative markings, for example in the form of text, symbols or numerical values, for additional security.
  • a wash color 64 is printed onto the second embossing lacquer layer 22 in the areas 62 that are to remain metal-free, as in FIG Fig.4(a) shown.
  • the areas 62 lie completely within the free areas 54, i.e. do not overlap with the lacquer areas 52 with the first embossing lacquer layer 32.
  • the surface area 20 is metallized over the entire surface together with the washing paint 64 and is thereby provided with the metal layer 26, as in Fig.4(b) shown.
  • the washing ink 64 is washed out together with the part of the metallization 26 lying on the washing ink and the in Fig.4(c) shown, partially demetallized metal layer 26 obtained.
  • the security element is then completed by providing further layers 28 .
  • the security element 60 is oriented when viewed from the side of the carrier 18, whether the carrier remains permanently in the security element or is peeled off after application to a target substrate.
  • the areas 62 form negative indicia in the finished security element 60, which allow the security element to be looked through. If the second embossing lacquer layer 22 is colorless and transparent, the negative markings 62 also appear colorless and transparent. In the case of a colored second embossing lacquer layer 22, the negative indicia 62 appear with the transparent color of the embossing lacquer layer 22.
  • the demetallization can also be carried out, for example, by an etching process, with an etching resist being applied before the etching step in the areas in which the metal is not to be removed, which is removed again after the etching process.
  • Area-by-area removal of a metal layer that was initially applied over the entire area by laser impingement can also be considered for demetallization.
  • a continuous embossed layer 72 is arranged on a carrier 18 and can be designed, for example, as a thermoplastic layer or as an embossed lacquer layer.
  • a reflective color layer 75 is applied, in particular printed, only in partial areas 44, as can be seen in representation a.
  • the reflective color layer 75 comprises a binder 77, sinking pigments 78 and colorants 73, as a dissolved dye or as color pigments.
  • the sinking pigments 78 sink to the underside of the (still unembossed) color layer 75 and form a reflective (or reflection-increasing) layer 76 there.
  • both layers 72, 75 are embossed together.
  • the surface of the relief structure 34 is formed in the partial areas 44 by the surface 34a of the embossed reflective color layer 75 and in the free areas 42 by the surface 34b of the embossed embossed layer 72.
  • the further (first) relief structure 24 is shown in the third illustration c.
  • An embossing lacquer layer 71 is applied to the existing (second) relief structure 34, embossed differently and metallized with a reflection-increasing layer 26. See-through areas 62 can of course also be produced here or afterwards.
  • the method presented here differs primarily from the method shown in FIG figure 5 that an embossing layer 82 is first embossed on the carrier 18 and then the colored layer 75 is applied.
  • the surface of the relief structure 34 is formed in the free areas 42 by the embossed surface 34b of the embossed embossed layer 82 .
  • the color layer 75 with its sunken pigments 78 lies on the embossed surface of the embossed embossing layer 82. Since both surfaces of the color layer 75 follow the embossed structure, the sunken pigments 78 in turn form the reflection-enhancing layer 76 of the second relief structure 34.
  • a multicolored paint layer 83 is applied to an optional intermediate layer 84, which is shown in the figure with two differently colored sections.
  • the embossing lacquer layer 81 of the first relief structure is applied thereto, onto which (before or) after the embossing a metal layer or HRI layer is vapour-deposited as a reflection-increasing layer 89 .
  • the security element 80 which is designed as a strip or patch, could be transferred, for example to a banknote substrate.
  • the carrier 18 can optionally remain in turn or be removed from the embossed layer 82 after the transfer.
  • a see-through area 62 can again be seen as a sub-area of the free area 42 .
  • the security element 90 in 7 comprises a second relief structure 34 in addition to a first relief structure with an embossed embossing layer 22 and a vapor-deposited reflection-increasing layer 99.
  • the relief structure 34 comprises at least two sub-areas 44 of different construction.
  • sinking pigments 38 for example in an embossing lacquer layer 32 (or in an ink layer) are used, and in a second of the sub-areas floating pigments 98 are used.
  • the floating pigments 98 which form the reflection-enhancing layer 96 are contained in a reflection-enhancing color layer 95 which has been applied to an embossed embossing layer 92 .
  • the reflection-enhancing layer follows the surface relief of the embossed embossing layer 92, which is in particular an embossing lacquer layer.
  • the reflection-enhancing color layer 95 also includes a colorant 93 in a binder 97.
  • the reflection-increasing color layer 95 follows the relief with only one of its two surfaces.
  • the second surface of the color layer 95 does not have the relief or has no relief.
  • An embossing lacquer layer is used in the first of the sub-areas 44 and a reflection-increasing color layer is used in the second of the sub-areas.
  • the relief structure 34 has different embossed layers 32, 92 in the partial areas 44 with the sections 34d and 34e, which are embossed together (with and/or without colorants or with and/or without floating or sinking pigments).
  • the security element 90 could also (alternatively) be attached to the carrier 18 by means of an overlying adhesive layer 88 instead of an underlying adhesive layer.

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Claims (20)

  1. Élément de sécurité optiquement variable destiné à la protection d'objets de valeur dont la surface définit un axe z perpendiculaire à celle-ci, ledit élément de sécurité comportant une zone de surface réfléchissante qui présente au moins deux aspects reconnaissables depuis des directions d'observation différentes,
    - la zone de surface réfléchissante contenant une première structure en relief (24) et une deuxième structure en relief (34) qui sont disposées de sorte à se chevaucher au moins partiellement dans la direction z à différents niveaux de hauteur,
    - la première structure en relief (24) étant pourvue d'une couche d'augmentation de réflexion (26),
    - la deuxième structure en relief (34) comportant une couche d'augmentation de réflexion (36),
    - la deuxième structure en relief (34) comprenant une couche d'estampage (32 ; 72), et
    - la zone de surface réfléchissante comportant des sous-zones (44) pourvues d'une deuxième structure en relief réfléchissante (34, 36) et des zones libres (42) sans deuxième structure en relief réfléchissante (34, 36),
    caractérisé en ce que
    la couche d'estampage (32) est prévue uniquement dans les sous-zones (44) de la zone de surface réfléchissante mais pas dans les zones libres (42),
    la deuxième structure en relief (34) est prévue uniquement dans les sous-zones (44) de la zone de surface réfléchissante, et
    la couche d'augmentation de réflexion (36) de la deuxième structure en relief (34) est formée par des pigments flottants ou enfoncés.
  2. Élément de sécurité selon la revendication 1, caractérisé en ce que la deuxième structure en relief (34) comprend une couche de couleur (75).
  3. Élément de sécurité selon la revendication 1 ou 2, caractérisé en ce que, dans la couche d'estampage (32), des pigments flottants ou enfoncés forment la couche d'augmentation de réflexion (36) de la deuxième structure en relief (34).
  4. Élément de sécurité selon l'une des revendications 1 à 3, caractérisé en ce que la deuxième structure en relief (34) est formée par une couche de peinture estampée (32) dont le côté structure en relief présente une couche de surface qui est pourvue de pigments flottants ou enfoncés dans la couche d'amélioration de la réflexion (36) et qui forme la deuxième structure en relief.
  5. Élément de sécurité selon l'une des revendications 1 ou 2, caractérisé en ce que, dans une couche de couleur (75) d'augmentation de réflexion, de préférence réfléchissante, des pigments flottants ou enfoncés (78) forment la couche d'augmentation de réflexion (76) de la deuxième structure en relief (34).
  6. Élément de sécurité selon l'une des revendications 1, 2 ou 5, caractérisé en ce que la deuxième structure en relief (34) est formée par une couche d'estampage (72) et une couche de couleur d'augmentation de réflexion (75), le côté structure en relief de la couche de couleur réfléchissante présentant une couche de surface qui est pourvue des pigments flottants ou enfoncés (78) dans la couche de couleur (75) d'augmentation de réflexion et qui forme la couche d'augmentation de réflexion (36) de la deuxième structure en relief.
  7. Élément de sécurité selon la revendication 6, caractérisé en ce que les deux côtés de la couche de couleur d'augmentation de réflexion (75) suivent le tracé en relief de la deuxième structure en relief, en particulier la couche d'augmentation de réflexion (76) étant disposée du côté dirigé vers la couche d'estampage (72 ; 82) ou opposé à celle-ci.
  8. Élément de sécurité selon la revendication 6 ou 7, caractérisé en ce que la couche d'estampage (72 ; 82) et la couche de couleur d'augmentation de réflexion (75) sont estampées conjointement.
  9. Élément de sécurité selon la revendication 6, caractérisé en ce que seul le côté de la couche de couleur d'augmentation de réflexion (75) qui est dirigé vers la couche d'estampage (82) suit le tracé en relief de la deuxième structure en relief.
  10. Élément de sécurité selon la revendication 6 ou 9, caractérisé en ce que seule la couche d'estampage (82) est estampée et la couche de couleur d'augmentation de réflexion (75) est appliquée dans les sous-zones (44) sur la couche d'estampage (82) qui a été estampée.
  11. Élément de sécurité selon l'une au moins des revendications 1 à 10, caractérisé en ce que les pigments flottants ou enfoncés sont
    des pigments optiquement variables ; et/ou
    des pigments anisotropes qui sont orientés suivant le tracé en relief de la deuxième structure en relief et/ou qui ont une plus grande dimension au-dessous des dimensions de structure latérales de la deuxième structure en relief.
  12. Élément de sécurité selon l'une au moins des revendications 1 à 11, caractérisé en ce que la deuxième structure en relief et/ou la première structure en relief sont formées par des ensembles de micro-miroirs comportant des micro-miroirs à réflexion dirigée, notamment des miroirs non diffractifs, et de préférence des miroirs plans, des miroirs concaves et/ou des miroirs de type Fresnel.
  13. Élément de sécurité selon l'une au moins des revendications 1 à 12, caractérisé en ce que la deuxième structure en relief présente un premier effet optiquement variable, notamment dans une première couleur, et la première structure en relief située dans les zones libres de la zone de surface présente un deuxième effet optiquement variable, notamment une deuxième couleur différente, de préférence lorsque l'élément de sécurité est observé du même côté.
  14. Élément de sécurité selon l'une au moins des revendications 1 à 13, caractérisé en ce que la couche d'augmentation de réflexion (26) de la première structure en relief (24) est formée par un revêtement de couleur d'augmentation de réflexion, notamment par une métallisation, une structure en couches minces, par une couleur de lasurage déposée par métallisation, par une couleur luminescente avec revêtement miroir métallique et/ou par une couleur nano-particulaire.
  15. Élément de sécurité selon l'une au moins des revendications 1 à 14, caractérisé en ce que la couche d'augmentation de réflexion (26) de la première structure en relief (24) est formée par une couche de métallisation sous vide.
  16. Élément de sécurité selon l'une au moins des revendications 1 à 15, caractérisé en ce que les sous-zones (44) et les zones libres (42) sont conçues au moins comme une trame régulière ou irrégulière pourvue d'éléments de trame, les dimensions des éléments de trame dans une direction latérale ou les deux directions latérales étant inférieures à 140 um, de préférence comprises entre 20 µm et 100 um, notamment entre 20 µm et 60 um ; en particulier, la trame formée par les sous-zones et les zones libres étant conçue par les éléments de trame avec une couverture de surface constante qui est avantageusement comprise entre 30 % et 70 %, de préférence entre 40 % et 60 %, plus préférablement qui est de 50 % environ.
  17. Élément de sécurité selon l'une au moins des revendications 1 à 15, caractérisé en ce que les sous-zones (44) et les zones libres (42) sont conçues sous la forme d'une zone d'effet au moins dans une partie de la zone de surface dans laquelle les sous-zones et/ou les zones libres ont des dimensions latérales supérieures à 140 µm ; notamment au moins une sous-zone et/ou au moins une zone libre étant formée (s) avec des dimensions latérales supérieures à 250 um, de préférence supérieures à 500 um et en particulier supérieures à 1 mm.
  18. Élément de sécurité selon l'une au moins des revendications 1 à 17,
    caractérisé en ce que
    des identificateurs négatifs sont formés dans l'élément de sécurité en tant que caractéristique de sécurité par des évidements (62) ménagés dans la couche d'augmentation de réflexion de la première structure en relief, des évidements ménagés dans la couche d'augmentation de réflexion de la deuxième structure en relief ou des zones libres étant présents notamment de manière congruente ; et/ou
    une autre caractéristique de sécurité, visible par l'observateur ou lisible par machine, est contenue dans l'élément de sécurité et est disposée en particulier dans la zone de surface réfléchissante ou à l'extérieur de celle-ci.
  19. Support de données comprenant un élément de sécurité optiquement variable selon l'une des revendications 1 à 18, qui est de préférence appliqué comme élément de transfert sur le substrat du support de données, qui a été créé sur le substrat du support de données ou qui est introduit dans le substrat du support de données, et qui comprend éventuellement d'autres caractéristiques de sécurité ou éléments de sécurité, visibles par l'observateur ou lisibles par machine.
  20. Procédé de réalisation d'un élément de sécurité optiquement variable pourvu d'une zone de surface réfléchissante qui présente au moins deux aspects reconnaissables depuis des directions d'observation différentes, notamment selon l'une des revendications 1 à 18, procédé dans lequel
    - un support (18) est fourni dont l'étendue de surface définit un plan et un axe z perpendiculaire à celui-ci,
    - le support (18) est pourvu d'une zone de surface réfléchissante qui contient deux structures en relief (24, 34) qui sont disposées de sorte à se chevaucher au moins partiellement dans la direction z à différents niveaux de hauteur et qui forment une première et une deuxième structure en relief, la deuxième structure en relief (34) comprenant une couche d'estampage (32 ; 72),
    - la première structure en relief (24) étant pourvue d'une couche d'augmentation de réflexion (26) qui suit le tracé en relief de ladite première structure en relief, et
    - la deuxième structure en relief (34) étant pourvue d'une couche d'augmentation de réflexion (36) qui suit le tracé en relief de ladite deuxième structure en relief,
    la zone surface réfléchissante comportant des sous-zones (44) pourvues d'une deuxième structure en relief réfléchissante (34, 36) et des zones libres (42) sans deuxième structure en relief réfléchissante (34, 36), caractérisé en ce que
    la couche d'estampage (32 ; 72) est prévue uniquement dans les sous-zones (44) de la zone de surface réfléchissante mais pas dans les zones libres (42),
    la deuxième structure en relief (34) est prévue uniquement dans les sous-zones (44) de la surface réfléchissante, et
    des pigments flottants ou enfoncés forment la couche d'augmentation de réflexion (36) de la deuxième structure en relief (34).
EP21020303.0A 2020-08-13 2021-06-11 Élément de sécurité optique variable Active EP3954543B1 (fr)

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