EP4244070B1 - Élément de sécurité optiquement variable ayant une région caractéristique réfléchissante/transmissive - Google Patents

Élément de sécurité optiquement variable ayant une région caractéristique réfléchissante/transmissive

Info

Publication number
EP4244070B1
EP4244070B1 EP21786769.6A EP21786769A EP4244070B1 EP 4244070 B1 EP4244070 B1 EP 4244070B1 EP 21786769 A EP21786769 A EP 21786769A EP 4244070 B1 EP4244070 B1 EP 4244070B1
Authority
EP
European Patent Office
Prior art keywords
reflection
security element
region
transmission
motif
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
EP21786769.6A
Other languages
German (de)
English (en)
Other versions
EP4244070A1 (fr
Inventor
Matthias Pfeiffer
Tobias Sattler
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
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP4244070A1 publication Critical patent/EP4244070A1/fr
Application granted granted Critical
Publication of EP4244070B1 publication Critical patent/EP4244070B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows

Definitions

  • the invention relates to an optically variable security element for protecting valuables with a partially reflective and partially transmissive feature area, as well as a data carrier equipped with such a security element.
  • Data storage media such as valuables or identification documents, as well as other valuable items such as branded goods, are often provided with security elements for security purposes. These elements allow verification of the authenticity of the data storage media and also serve as protection against unauthorized reproduction.
  • These security elements can, for example, take the form of a security thread embedded in a banknote, a cover foil for a banknote with a hole, an applied security strip, a self-supporting transfer element, or even a feature area applied directly to a valuable document.
  • the invention is based on the object of providing a generic optically variable security element with an attractive appearance and a high level of counterfeit protection.
  • the security element should be verifiable in a variety of ways and contain several independently verifiable pieces of information.
  • the invention contains an optically variable security element with a partially reflective and partially transmissive feature region, which can be used in particular to secure valuables.
  • the surface area of the security element defines a z-axis perpendicular thereto.
  • the feature region of the security element contains a first sub-region with a first reflection-enhancing coating, which forms a first reflection motif visible in reflection.
  • the feature region also contains a second sub-region with a second reflection-enhancing coating, which forms a second reflection motif visible in reflection.
  • the first and second sub-regions reflect incident light differently.
  • the first and second reflection motifs are visible differently depending on the viewing direction.
  • the first and second sub-regions of the feature region each contain a relief structure provided with the first or second reflection-enhancing coating.
  • the relief structures are arranged at different heights in the z-direction and form a lower and a higher relief structure.
  • the feature region contains a transmission region in which the first and/or second reflection-enhancing coating is left out.
  • the transmission region forms a transmission motif visible in transmission, which is multicolored and appears in transmission with two or more bright colors.
  • the feature region contains a multicolored layer that is at least partially translucent for generating the multicolored transmission motif, wherein the multicolored layer has a colorless transparent region and a multicolored color region with the two or more different bright colors.
  • the said multicolored layer is arranged between the two relief structures arranged at different heights in the z-direction.
  • chromatic colors When it comes to color, a distinction is usually made between chromatic colors and achromatic colors.
  • Chromatic colors are characterized not only by their brightness but also by their hue and saturation.
  • Achromatic colors are white, black, and the shades of gray between black and white.
  • the multi-color layer can be implemented as a printed layer, but also as another color-imparting layer, such as a vapor-deposited layer or multiple vapor-deposited layers.
  • the multi-color layer is translucent, at least in some areas, in the transmission range to form the motif visible in transmission. Outside the transmission range, the multi-color layer can also be opaque, and the multi-color layer can also have opaque sub-regions within the transmission range to create a transmission motif with light areas (translucent sub-regions) and dark areas (opaque sub-regions).
  • the colors of the multi-color layer are advantageously formed by body colors, which can be opaque or, particularly advantageously, translucent.
  • effect colors can also form some or all of the colors of the multi-color layer.
  • Effect colors are provided in particular by pearlescent pigments, by pigments based on liquid-crystalline materials, by interference layer pigments, or by metallic colors, especially bright metallic colors such as gold or copper.
  • the multi-color layer can contain color-constant colors and/or optically variable colors, which, depending on the viewing direction, produce a different color impression in transmission and/or a different color impression in reflection. in particular gold or copper colours, than in transmission, in particular blue or green.
  • the multi-color layer may additionally contain luminescent substances, IR-absorbing substances, magnetic substances or other machine-readable feature substances.
  • the first and second partial areas preferably reflect incident light in different directions, so that the first and second reflection motifs are visible from different viewing directions.
  • the viewing direction areas in which the two reflection motifs are visible preferably only partially overlap or do not overlap.
  • the first and second partial areas can – alternatively or additionally – reflect incident light differently, so that the first and second reflection motifs exhibit different motif effects depending on the viewing direction. Examples of well-known different motif effects that can also be combined with one another are: motif movement, three-dimensional motifs, plane-shifted motifs, or motif changes.
  • Plane-shifted motifs (or motifs with their own display plane) are apparently shifted to a ground plane, the security element or the relief structure, and thus appear to the viewer to float above or below the ground plane.
  • the first reflection motif can particularly preferably appear in a first color and the second reflection motif in a second color.
  • the reflection-enhancing coating preferably follows the relief pattern of the corresponding relief structure.
  • the terms higher and lower refer to the position of the relief structures relative to the eye of an observer who observes the reflection motifs of the security element in incident light.
  • the higher-lying relief structure preferably covers the lower-lying relief structure at least in some areas, wherein the transmission area in the overlapping areas is formed by overlapping recesses of the higher-lying and the lower-lying reflection-enhancing coating.
  • the multi-colour layer mentioned can be designed as a flat structure, but it can also advantageously follow the relief pattern of one or both relief structures.
  • the transmission area represents a single, contiguous sub-area of the feature area. It can also advantageously be provided that the transmission area is formed by a plurality of separate subregions of the feature region.
  • the transmission region can be formed, in particular, by a regular grid of recesses in the first and/or second reflection-enhancing coating, wherein the dimensions of the non-recessed grid elements and the recessed grid spaces are each below the resolution limit of the human eye and, at least in one direction, are between 20 ⁇ m and 200 ⁇ m, preferably between 60 ⁇ m and 150 ⁇ m, in particular between 80 ⁇ m and 120 ⁇ m.
  • the transmission area is in the form of an image motif, a portrait, a logo, a country code such as a flag representation, a code such as a barcode, or an alphanumeric character string.
  • the transmission motif preferably appears in transmission with three or more, especially even with five or more, bright colors.
  • the transmission motif can also represent a true color motif, i.e., a motif with multiple true colors. True colors are generally referred to as mixed colors of up to three primary colors, such as red, green, and blue.
  • the multi-colored transmission motif is preferably not visible to the observer when viewed in reflected light.
  • the transmission area is either not visible when viewed in reflected light or – depending on or independent of the viewing angle – is visible as a darker (because non-reflective) area.
  • the multi-color in the transmission area can even be visible in reflected light, whereby the visibility depends only on the viewing angle. or independent of the viewing angle.
  • the reflective, optically variable reflection motifs can be designed so that the transmission range and/or the multicoloration in the transmission range is recognizable - in only one viewing direction or in all viewing directions.
  • the lower relief structure is visible through the higher relief structure. It can also be visible through the higher relief structure and its reflection-enhancing coating, or it can be visible through the higher relief structure and through grid spaces or recesses in the higher reflection-enhancing coating.
  • the first and second partial areas advantageously each contain different reflection-enhancing coatings with different coloring effects.
  • a uniform reflection-enhancing coating is provided in both partial areas.
  • a different color effect of the partial areas in reflection can then be achieved, for example, by color-imparting, for example, translucent, embossed lacquer layers into which the desired relief structures are embossed.
  • the first and/or second partial area contains a relief structure in the form of an embossed, color-providing embossing lacquer layer.
  • the first and second partial areas can contain relief structures, i.e., embossed, color-providing embossing lacquer layers, with different color-providing effects. If at least one relief structure has a color-providing effect, this relief structure can also contribute to the multicolored transmission motif or even create it. If only one relief structure has a color-giving effect, this is advantageously the deeper relief structure, while the higher relief structure is colorless and transparent.
  • one or both relief structures are formed by micromirror arrangements with directionally reflecting micromirrors, in particular with non-diffractive mirrors, and preferably with plane mirrors, concave mirrors and/or Fresnel-like mirrors.
  • One or both reflection-enhancing coatings are advantageously formed, at least in regions, as a regular or irregular grid with grid elements and grid spaces, wherein the dimensions of the grid elements and grid spaces in one or both lateral directions are below 140 ⁇ m, preferably between 20 ⁇ m and 100 ⁇ m, in particular between 20 ⁇ m and 60 ⁇ m.
  • the security element advantageously displays an appearance when tilted or the viewing direction changes accordingly in reflection, suddenly jumping from a first to a second appearance (or from the second to the first appearance when tilted back).
  • Such a seamless transition between two different motifs with two different colors is referred to as a binary color and effect change.
  • the grid advantageously has a constant area coverage by the grid elements, which is expediently between 30% and 70%, preferably between 40% and 60%, in particular approximately 50%.
  • one or both reflection-enhancing coatings are present, at least in some regions, in sub-regions which have lateral dimensions of more than 140 ⁇ m, and/or that one or both reflection-enhancing coatings have, at least in some regions, cutouts with lateral dimensions of more than 140 ⁇ m.
  • the security element preferably displays 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 regions with different color impressions and different effects are precisely registered to one another, which is also referred to below as color-to-effect registration.
  • at least one of the said sub-regions or cutouts is advantageously formed with lateral dimensions of more than 250 ⁇ m, preferably of more than 500 ⁇ m and in particular of more than 1 mm.
  • the feature area of the security element can also be combined with other security features, for example with holograms, in particular true-color holograms, with sub-wavelength gratings or other sub-wavelength structures, with micromirror arrangements without diffractive gratings, or with machine-readable security features based on special material properties, such as electrical conductivity, magnetic properties, luminescence, fluorescence or the like.
  • the optically variable security element may contain additional layers, such as protective, covering, or additional functional layers, primer layers, or heat-sealing lacquer layers. However, these do not represent the essential elements of the present invention and are therefore not described in detail.
  • the security element is advantageously a security thread, in particular a window security thread or a pendulum security thread, a tear-off thread, a security tape, a security strip, a patch, or a label for application to a security paper, valuable document, or the like.
  • the security element may contain a carrier film or be present without a carrier film.
  • the invention also includes a data carrier with a security element of the type described.
  • the data carrier can be, in particular, a value document, 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 cheque, a high-value admission ticket, but also an identification card, such as a credit card, a bank card, a cash payment card, an authorization card, an identity card or a passport personalization page.
  • the security element is preferably arranged in a window area of the data carrier in order to be able to use both the reflection motifs and the transmission motif for authenticity testing.
  • the window area can be formed, for example, by a continuous opening in the data carrier, for example, by a hole in a paper substrate, by a transparent area in the data carrier, for example, by a transparent area of a polymer substrate, or by a translucent area, for example by a thin spot on a paper substrate.
  • FIG. 1 shows a schematic representation of a banknote 10 which has a number of different security features and is equipped in particular with a printing element 11, a watermark 12, a window security thread 14 partially embedded in the banknote paper 13, a foil strip 15 which closes a through opening 16 in the banknote paper, and a foil patch 17 which closes a further through opening 18 in the banknote paper.
  • the present invention particularly relates to the structure of the film elements 15, 17, which each display a combination of reflection motifs visible in incident light and a multi-colored transmission motif visible in the area of the opening 16 or 18. It is understood, however, that the invention does not apply to film elements and banknotes, but can be used for all types of security elements, for example labels on Goods and packaging, or in the protection of documents, ID cards, passports, credit cards, health cards, and the like.
  • transfer elements such as patches with or without their own carrier layer, for example, security threads or security strips, are particularly suitable.
  • the security element 20 conveys a three-dimensional impression to a viewer despite its flat design and simultaneously displays a binary color and effect change when the security element 20 or the document 10 to which the security element is applied is tilted.
  • the security element 20 displays a first optically variable effect, for example, a curved representation of the value number "20," appearing in a first color, for example, red.
  • the security element 20 displays a second optically variable effect, for example, a curved representation of a coat of arms appearing in a second color, for example, blue.
  • the appearance of the security element in reflection suddenly jumps from the first to the second appearance, or when tilting back from the second to the first appearance.
  • the change in the reflection motif and the color occurs simultaneously and without an intermediate or transitional stage in which both motifs or colors would be visible simultaneously or one motif would be visible in the color of the other motif.
  • the appearance therefore jumps seamlessly between two appearances and is therefore called a binary color and effect change.
  • the security element 20 also contains a transmission motif which, in practice, becomes visible in the areas where the security element 20 is applied over a transparent area or a through opening of a carrier document.
  • the security element 20 in the exemplary embodiment contains a flat, transparent, colorless carrier film 22, such as a transparent, colorless PET film.
  • a feature region 24 is formed on the carrier film 22, which in particular contains two relief structures 34, 44 arranged in the z-direction at two specific, different heights relative to the flat carrier film 22.
  • a translucent, multicolored flat structure 70 is arranged, which has, on the one hand, a colorless transparent region 72 and, on the other hand, a multicolored color region 74 with two or more different chromatic colors.
  • the relief structures each represent micromirror embossings or micromirror arrays 34, 44, each formed from a plurality of micromirrors inclined relative to the xy plane.
  • the local angles of inclination of the micromirrors are selected precisely so that the relief structure of the micromirror arrays 34, 44, after coating, creates a desired optically variable effect.
  • the different height levels of the micromirror arrays are defined by the different heights of the base surfaces of the micromirror arrays above the carrier film.
  • the micromirror arrays 34, 44 are each provided with a reflection-enhancing coating 36, 46, which creates the different color impression of the micromirror arrays when viewed in reflected light.
  • the reflection-enhancing coatings are formed, for example, by a red translucent paint (coating 36) backed by an opaque metallization or a blue translucent paint (coating 46) backed by an opaque metallization.
  • the micromirror arrangements 34, 44 are each embossed into a transparent embossing lacquer layer 32, 42 and, after the application and optionally structuring of the respective coating 36, 46, are leveled with a transparent topcoat layer 38 or 48.
  • the topcoat layers have essentially the same refractive index as the embossing lacquer layers 32, 42, so that the micromirrors are not visually visible in areas without a coating due to the lack of a refractive index difference between the embossing lacquer layer and the topcoat layer.
  • the micromirror arrangement 34 that is closer to the observer when viewing the reflection motifs in incident light is also referred to as the higher micromirror arrangement
  • the micromirror arrangement 44 that is further away from the observer is referred to as the lower micromirror arrangement
  • the respective coatings are referred to as the higher or lower reflection-enhancing coating.
  • the reflection-enhancing coatings 36, 46 are not present over the entire surface, but are formed by recesses in the Coatings 36, 46 different sub-areas within the feature area with different appearances were created.
  • the reflection-enhancing coating 36 of the higher micromirror arrangement 34 is present, which reflects incident light 60 in a first viewing direction 62 determined by the angle of inclination of the micromirrors.
  • the shape of the first partial area 52 forms a first reflection motif, which is visible to the observer from the said first viewing direction 62 as brightly shining with the color tone of the first translucent color, red in the exemplary embodiment.
  • the first sub-area 52 does not have to be contiguous, but can be formed by a plurality of separate sub-areas.
  • the reflection-enhancing coating 36 is not present in the entire feature area 24, but has recesses 35 in which the observer can look through the coating 36.
  • the reflection-enhancing coating 46 of the lower micromirror arrangement 44 is present, which reflects incident light 60 in a second viewing direction 64 determined by the angle of inclination of the micromirrors.
  • the shape of the second subregion 54 forms a second reflection motif, which, in the recesses 35 of the higher coating 36, is visible to the observer from the aforementioned second viewing direction 64, brightly shining with the color of the second translucent color, blue in this embodiment.
  • the second subregion 54 also does not have to be continuous, but can be formed by a plurality of separate subregions.
  • the color impression of the second reflection motif results from the color tone of the second translucent color and the color tone of the flat structure 70 in the second partial area 54.
  • the colorless transparent area 72 of the flat structure 70 and the second partial area 54 are arranged congruently with one another, so that the color impression of the second reflection motif results from the blue-reflecting color of the deeper coating 46.
  • the deeper reflection-enhancing coating 46 is not present in the entire feature area 24, but also has recesses 45 within the recesses 35 of the higher reflection-enhancing coating, in which the observer can look through the coating 46.
  • the areas in which recesses 35, 45 of the two coatings 36, 46 lie on top of one another form a transmission area 56 within the feature area 24, in which the incident light 60 passes through the two embossing lacquer layers and the flat structure 70 and can be perceived by the observer as transmitted light 66 on the opposite side of the security element 20.
  • the shape of the transmission area 56 forms a transmission motif, the color impression of which is determined by the color of the flat structure 70.
  • the color area 74 of the flat structure 70 is arranged congruently with the transmission area 56, so that the color impression of the transmission area 56 is determined by the color impression of the color area 74 and therefore, like this, two or more different
  • the transmission region 56 does not have to be continuous, but can be formed by a plurality of separate subregions, wherein the size of the subregions can be above or below the resolution limit of the human eye.
  • Figure 3 shows schematically the appearance of a security element according to the invention with a structure as in Fig. 2 , in (a) in reflected light in reflection and in (b) in transmitted light in transmission.
  • two reflection images 80, 82 are recognizable, for example a first reflection image 80 consisting of several geometric symbols (circle, triangle, square, pentagon) which exhibit a first optically variable effect in the first color determined by the higher coating 36.
  • the symbols can appear, for example, as shiny red symbols curved upwards out of the plane.
  • a second reflection image 82 is formed, for example, by a backdrop with a second optically variable effect in a second color determined by the lower coating 46 and appears, for example, as an inwardly curved, shiny blue bowl. What is striking and easily recognizable is the changing appearance of the two optically variable reflection images 80, 82 when the security element is tilted.
  • the two reflection images 80, 82 are not visible, the surface area occupied by these images appears rather dark and opaque.
  • the transmission motif 84 becomes apparent, which in the transmission area, for example, appears in the form of a multi-colored coat of arms with several bright colors, brightly against the dark background 86 of the reflection image areas.
  • the transmission image in the embodiment of the Fig. 3 no optical variability.
  • the transmission motif 84 can also be visible in incident light, but there it recedes behind the luminously reflecting, optically variable reflection motifs 80, 82.
  • the flat structure 70 can be a printed structure. Alternatively, however, it could also be applied differently and colored locally before, after, or during application, for example, by means of a laser or otherwise.
  • the flat structure 70 is further depicted as a full-surface layer comprising the colorless transparent region 72 and the multicolored color region 74.
  • the flat structure 70 may not be configured to cover the entire surface, for example, comprising only the multicolored color region 74 (free area instead of transparent area) or comprising transparent areas and free areas.
  • the translucent multi-coloured layer was designed as a flat structure for illustration purposes.
  • Figure 8 shows that the translucent Multi-color layer can also follow the relief pattern of a relief structure.
  • Figure 8 shows a variation of the design of the Fig. 2 a security element 180 in which the multi-color layer is not formed as a flat structure, but as a translucent multi-color coating 182, which is arranged between the micromirror arrangements 34, 44 and thereby follows the relief profile of the deeper micromirror arrangement 44.
  • the multi-color coating 182 has a colorless transparent area 184 and a multi-color color area 186 with two or more different colors, the latter being arranged congruent with the transmission area 56 and thus determining its color impression in transmission.
  • the visual appearance of the security element 180 of the Fig. 8 essentially corresponds to the appearance of the security element 20 of the Fig. 2 .

Landscapes

  • Credit Cards Or The Like (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Claims (13)

  1. Élément de sécurité (20) optiquement variable pour sécuriser des objets de valeur, dont l'étendue de surface définit un axe z perpendiculaire à lui, comprenant une zone caractéristique (24) partiellement réfléchissante et partiellement transmissive, dans lequel
    - la zone caractéristique (24) comprend une première zone partielle (52) ayant un premier revêtement augmentant la réflexion (36), qui forme un premier motif réfléchi (80) visible par réflexion, et une deuxième zone partielle (54) ayant un deuxième revêtement augmentant la réflexion (46), qui forme un deuxième motif réfléchi (82) visible par réflexion,
    - les première et deuxième zones partielles (52, 54) réfléchissent différemment la lumière incidente, les premier et deuxième motifs réfléchis (80, 82) étant visibles différemment selon la direction d'observation (62, 64),
    les première et deuxième zones partielles (52, 54) présentant chacune une structure en relief (34, 44) qui est pourvue du premier ou du deuxième revêtement augmentant la réflexion (36, 46), et
    les structures en relief (34, 44) sont agencées dans la direction z à différents niveaux de hauteur et forment une structure en relief (34 plus en profondeur et une structure en relief (44) plus élevée,
    - la zone caractéristique (24) comprend une zone de transmission (56) dans laquelle le premier et/ou le deuxième revêtement augmentant la réflexion (36, 46) est évidé et qui forme un motif de transmission (84) visible en transmission,
    caractérisé en ce que
    le motif de transmission (84) visible en transmission est multicolore et apparaît en transmission avec deux ou plus de deux couleurs chromatiques,
    la zone caractéristique (24) contient une couche multicolore (70) au moins partiellement transparente à la lumière pour générer le motif de transmission multicolore, qui présente une zone transparente incolore (72, 184) et une zone multicolore (74, 186) comprenant les deux, ou plus de deux, couleurs chromatiques différentes, et
    ladite couche multicolore (70) est agencée entre les deux structures en relief (34, 44) agencées à des niveaux de hauteur différents dans la direction z.
  2. Élément de sécurité selon la revendication 1, caractérisé en ce que le premier motif réfléchissant (80) apparaît dans une première couleur chromatique et le deuxième motif réfléchissant (82) dans une deuxième couleur chromatique ; et/ou les première et deuxième sous-zones (52, 54) réfléchissent la lumière incidente dans des directions différentes, de sorte que les premier et deuxième motifs réfléchis (80, 82) sont visibles depuis des directions d'observation différentes (62, 64).
  3. Élément de sécurité selon l'une des revendications 1 et 2, caractérisé en ce que le revêtement augmentant la réflexion (36, 46) suit le tracé en relief respectif de la structure en relief (34, 44).
  4. Élément de sécurité selon la revendication 3, caractérisé en ce que la structure en relief plus élevée (34) recouvre au moins partiellement la structure en relief plus en profondeur (44) et la zone de transmission (56) est formée dans les zones de recouvrement par des évidements superposés (35, 45) du revêtement augmentant la réflexion situé plus haut et de celui situé plus en profondeur (36, 46).
  5. Élément de sécurité selon au moins une des revendications 1 à 4, caractérisé en ce que ladite couche multicolore est réalisée sous la forme d'une structure plane (70) ; ou
    ladite couche multicolore (182) suit le tracé en relief d'une ou des deux structures en relief.
  6. Élément de sécurité selon au moins une des revendications 1 à 5, caractérisé en ce que la zone de transmission (56) représente une zone partielle unique et continue de la zone caractéristique (24), ou en ce que la zone de transmission est formée par une pluralité de zones partielles séparées les unes des autres.
  7. Élément de sécurité selon au moins une des revendications 1 à 6, caractérisé en ce que la zone de transmission (56) est formée par une trame régulière d'évidements dans le premier et/ou le deuxième revêtement augmentant la réflexion, les dimensions des éléments de trame et des espaces évidés entre les éléments de trame étant respectivement inférieures à la limite de résolution de l'œil humain et, au moins dans une direction, sont comprises entre 20 µm et 200 µm, de préférence entre 60 µm et 150 µm, en particulier entre 80 µm et 120 µm.
  8. Élément de sécurité selon au moins une des revendications 1 à 7, caractérisé en ce que la zone de transmission (56) est réalisée sous la forme d'un motif d'image, d'un portrait, d'un logo, d'un symbole national, tel qu'un drapeau, d'un code, tel qu'un code-barres, ou d'une suite de caractères alphanumériques.
  9. Élément de sécurité selon au moins une des revendications 1 à 8, caractérisé en ce que la structure en relief plus profonde (44) est visible à travers la structure en relief plus élevée (34) ou à travers la structure en relief plus élevée (34) et son revêtement augmentant la réflexion (36), ou à travers la structure en relief plus élevée (34) et à travers des espaces entre les trames (35) ou des évidements dans le revêtement augmentant la réflexion (36) situé au-dessus.
  10. Élément de sécurité selon au moins une des revendications 1 à 9, caractérisé en ce que les première et deuxième zones partielles (52, 56) contiennent chacune des revêtements augmentant la réflexion (36, 46) différents ayant des effets de coloration différents ; et/ou
    la première et/ou la deuxième zone partielle (52, 56) contiennent une structure en relief sous la forme d'une couche de laque gaufrée colorante.
  11. Élément de sécurité selon au moins une des revendications 1 à 10, caractérisé en ce qu'une ou les deux structures en relief sont formées par des agencements de micro-miroirs (34, 44) avec des micro-miroirs à réflexion directionnelle, en particulier avec des miroirs à effet non diffractif, et de préférence avec des miroirs plans, des miroirs concaves et/ou des miroirs de type Fresnel.
  12. Élément de sécurité selon au moins l'une des revendications 1 à 11, caractérisé en ce que
    un ou les deux revêtements augmentant la réflexion (36, 46) sont réalisés, au moins par endroits, sous la forme d'une trame régulière ou irrégulière comprenant des éléments de trame et des espaces entre les éléments de trame, les dimensions des éléments de trame et des espaces entre les éléments de trame dans une ou les deux directions latérales étant inférieures à 140 µm, de préférence comprises entre 20 µm et 100 µm, en particulier entre 20 µm et 60 µm ; et/ou
    un ou les deux revêtements augmentant la réflexion (36, 46) sont présents, au moins par endroits, dans des zones partielles dont les dimensions latérales sont supérieures à 140 µm, et/ou en ce qu'un ou les deux revêtements augmentant la réflexion comprennent, au moins par endroits, des évidements dont les dimensions latérales sont supérieures à 140 µm.
  13. Support de données (10) comprenant un élément de sécurité (15, 17) optiquement variable selon au moins une des revendications 1 à 12, dans lequel l'élément de sécurité est de préférence agencé dans une zone formant fenêtre (16, 18) du support de données.
EP21786769.6A 2020-11-16 2021-10-04 Élément de sécurité optiquement variable ayant une région caractéristique réfléchissante/transmissive Active EP4244070B1 (fr)

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DE102020007013.2A DE102020007013A1 (de) 2020-11-16 2020-11-16 Optisch variables Sicherheitselement mit reflektivem/transmissivem Merkmalsbereich
PCT/EP2021/025381 WO2022100881A1 (fr) 2020-11-16 2021-10-04 Élément de sécurité optiquement variable ayant une région caractéristique réfléchissante/transmissive

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EP4244070B1 true EP4244070B1 (fr) 2025-09-17

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DE102023103092A1 (de) * 2023-02-08 2024-08-08 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement mit Transmissions- und Reflexionsbereich
DE102023126440A1 (de) * 2023-09-28 2025-04-03 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement, Wertgegenstand und Herstellungsverfahren

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DE102012020550A1 (de) 2012-10-19 2014-04-24 Giesecke & Devrient Gmbh Optisch variables Flächenmuster
DE102018005474A1 (de) 2018-07-09 2020-01-09 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich
DE102018005454A1 (de) 2018-07-09 2020-01-09 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich
DE102018005447A1 (de) 2018-07-09 2020-01-09 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich
DE102019003947A1 (de) 2019-06-06 2020-12-10 Giesecke+Devrient Currency Technology Gmbh Verfahren zum Herstellen eines optisch variablen Sicherheitselements

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EP4244070A1 (fr) 2023-09-20
DE102020007013A1 (de) 2022-05-19

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