WO2022100881A1 - Élément de sécurité optiquement variable ayant une région caractéristique réfléchissante/transmissive - Google Patents

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

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Publication number
WO2022100881A1
WO2022100881A1 PCT/EP2021/025381 EP2021025381W WO2022100881A1 WO 2022100881 A1 WO2022100881 A1 WO 2022100881A1 EP 2021025381 W EP2021025381 W EP 2021025381W WO 2022100881 A1 WO2022100881 A1 WO 2022100881A1
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WO
WIPO (PCT)
Prior art keywords
reflection
security element
area
transmission
motif
Prior art date
Application number
PCT/EP2021/025381
Other languages
German (de)
English (en)
Inventor
Matthias Pfeiffer
Tobias Sattler
Original Assignee
Giesecke+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+Devrient Currency Technology Gmbh filed Critical Giesecke+Devrient Currency Technology Gmbh
Priority to EP21786769.6A priority Critical patent/EP4244070A1/fr
Publication of WO2022100881A1 publication Critical patent/WO2022100881A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—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 objects of value with a partially reflective and partially transmissive feature area, as well as a data carrier equipped with such a security element.
  • Data carriers such as valuables 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 carriers 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 applied directly to a document of value.
  • optically variable security elements were proposed which have two relief structures arranged at different height levels and each provided with a color coating (see WO 2020/011390 A1, WO 2020/011391 A1 and WO 2020/011392 A1).
  • the invention is based on the object of specifying a generic optically variable security element with an attractive appearance and high protection against forgery.
  • the security element should be testable in a variety of ways and should contain a number of independently testable pieces of information. This problem is solved by the features of the independent claims. Developments of the invention are the subject matter of the dependent claims.
  • the invention contains an optically variable security element with a partially reflective and partially transmissive feature area, which can be used in particular to protect valuables.
  • the surface extent of the security element defines a z-axis perpendicular thereto.
  • the feature area of the security element contains a first partial area with a first reflection-increasing coating, which forms a first reflection motif that is visible in reflection.
  • the feature area also contains a second partial area with a second reflection-increasing coating, which forms a second reflection motif that is visible in reflection.
  • the first and second partial areas reflect incident light differently.
  • the first and second reflection motifs are differently visible depending on a viewing direction.
  • the feature area contains a transmission area in which the first and/or second reflection-enhancing coating is omitted.
  • the transmission area forms a transmission motif visible in transmission, which is multicolored and appears in transmission with two or more chromatic colors.
  • color a distinction is usually made between chromatic colors and achromatic colors, whereby 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 feature area contains a multicolored layer that is translucent at least in some areas to produce the multicolored transmission motif.
  • the multicolor layer can be implemented by a printed layer, but also by another color-imparting layer, for example a vapor-deposited layer or multiple vapor-deposited layers.
  • the multicolor layer is translucent at least in regions in order to form the motif visible in transmission there.
  • the multicolor layer can also be opaque and the multicolor layer can also have opaque subareas within the transmission area in order to form a transmission motif with light areas (light-transmitting areas) and dark areas (opaque areas).
  • the colors of the multicolor layer are advantageously formed by body colors, which can be opaque or particularly advantageously glazing, ie translucent.
  • effect colors can also form some or all of the colors of the multicolor 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, in particular colored metallic colors such as gold or copper color.
  • the multicolor 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 colored than in transmission, in particular blue or green.
  • the multicolor layer can 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 motif are visible from different viewing directions.
  • the viewing direction areas in which the two reflection motifs are visible are preferably only partially overlapping or non-overlapping.
  • the first and second partial area can - alternatively or additionally - reflect incident light differently, so that the first and second reflection motif show different motif effects that depend on the viewing direction. Examples of well-known different motif effects that can also be combined with one another are: three-dimensional motif, plane-shifted motif or motif change. Motifs that have been shifted in planes (or motifs with their own representation plane) are apparently shifted to a basic plane of the security element or the relief structure, ie they float above or below the basic plane for the viewer.
  • the first reflection motif can particularly preferably appear in a first chromatic color and the second reflection motif in a second chromatic color.
  • the first and second partial area of the feature area advantageously each contain a relief structure that is provided with the first or second reflection-increasing coating.
  • the anti-reflective coating preferably follows the course of the relief of the associated relief structure.
  • the relief structures are arranged at different height levels in the z-direction and form a lower-lying and a higher-lying relief structure.
  • the terms higher and lower relate to the position of the relief structures relative to the eye of an observer who is looking at 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 regions, with the transmission region in the covering regions being formed by overlapping recesses in the higher-lying and the lower-lying reflection-increasing coating.
  • the multicolor layer mentioned is arranged between the two relief structures arranged at different height levels in the z-direction.
  • the multicolor layer mentioned is arranged below the two relief structures.
  • Said multicolor layer can be designed as a flat structure, but it can also advantageously follow the relief profile of one or both relief structures.
  • the transmission area represents a single, coherent partial area of the feature area. It can also advantageously be provided that the transmission area is formed by a plurality of separate partial areas of the feature area.
  • the transmission area can be formed in particular by a regular grid of gaps in the first and/or second reflection-increasing coating, with the dimensions of the grid elements that are not gapped and the gaps in the gaps between the grids being below the resolution limit of the human eye and at least in one Direction between 20 microns and 200 microns, preferably between 60 microns and 150 microns, in particular between 80 microns and 120 microns.
  • the transmission area is preferably designed in the form of an image motif, a portrait, a logo, a country identifier such as a flag representation, a code such as a barcode, or an alphanumeric character sequence.
  • the transmission motif preferably even appears with three or more, in particular even with five or more, chromatic colors.
  • the transmission motif can also represent a real color motif, ie a motif with a plurality of real colors.
  • True colors are general mixed colors made up of up to three primary colors, such as red, green and blue.
  • the multicolored transmission motif is preferably not recognizable to the viewer when viewed in reflected light.
  • the transmission area is either not recognizable when viewed in incident light or—depending on the viewing angle or independently—recognisable as a darker (because it is not reflective) area.
  • even the multiple colors in the transmission range can also be recognizable in reflected light, with the recognisability only depending on the viewing angle. dependent or independent of the viewing angle.
  • the reflective, optically variable reflection motifs can be designed in such a way that--in just one viewing direction area or under all viewing directions--the transmission area and/or the multicolor nature in the transmission area can be seen.
  • the lower-lying relief structure is visible through the higher-lying relief structure. It can also be visible through the higher-lying relief structure and its reflection-enhancing coating, or it can be visible through the higher-lying relief structure and through grid gaps or gaps in the higher-lying reflection-enhancing coating.
  • the first and second sections each contain different reflection-increasing coatings with different coloring effects.
  • a uniform reflection-increasing coating is provided in both partial areas.
  • a different color effect of the partial areas in reflection can then be obtained, for example, by embossing lacquer layers that are colored, for example glazed, 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, coloring embossing lacquer layer.
  • the first and second partial area can contain relief structures, that is to say embossed coloring embossing lacquer layers with different coloring effects. If at least one relief structure has a coloring effect, then this relief structure can also contribute to the multicolored transmission motif or even produce it. points if only one relief structure has a coloring effect, this is advantageously the lower-lying relief structure, while the higher-lying relief structure is colorless and transparent.
  • one or both relief structures 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.
  • One or both reflection-increasing coatings are advantageously designed, at least in regions, as a regular or irregular grid with grid elements and grid spaces, the dimensions of the grid elements and grid spaces being less than 140 ⁇ m, preferably between 20 ⁇ m and 100 ⁇ m, in one or both lateral directions. in particular between 20 microns and 60 microns.
  • the security element advantageously shows an appearance when tilted or a corresponding change in the viewing direction in reflection, which suddenly jumps from a first to a second appearance (or when tilted back from the second to the first appearance). Simultaneously and without intermediate or transitional stages, there is a change in the motif shown (e.g. a value number or a coat of arms) and the color (e.g. magenta, green or blue). Such an appearance that changes seamlessly 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 around 50%.
  • one or both reflection-increasing coatings are present, at least in some areas, in partial areas that have lateral dimensions of more than 140 ⁇ m, and/or that one or both reflection-increasing coatings at least partially have recesses with 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 precisely matched to one another, which is also referred to below as color-to-effect matching.
  • at least one of the partial areas or cutouts mentioned is advantageously formed with lateral dimensions of more than 250 ⁇ m, preferably more than 500 ⁇ m and in particular 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 real-color holograms, with sub-wavelength gratings or other sub-wavelength structures, with micromirror arrangements without diffractive gratings, or also with machine-readable security features.
  • security features for example with holograms, in particular real-color holograms, with sub-wavelength gratings or other sub-wavelength structures, with micromirror arrangements without diffractive gratings, or also with machine-readable security features.
  • the optically variable security element can contain further 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 more detail.
  • the security element is advantageously a security thread, in particular a window security thread or a pendulum security thread, a tear-open thread, a security band, a security strip, a patch or a label for application to security paper, a document of value or the like.
  • the security element can 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 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 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 ID card or a passport personalization page.
  • Said 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, for example, through a continuous opening in the data carrier, for example through a hole in a paper substrate, through a transparent area in the data carrier, for example through a transparent area of a polymer substrate, or through a translucent area Area, for example, be formed by a thin part of a paper substrate.
  • FIG. 1 shows a schematic representation of a bank note with a number of security features, in particular with two film elements according to the invention
  • FIG. 2 shows a schematic cross section of a security element according to the invention
  • FIG. 3 schematically shows the appearance of a security element according to the invention, in (a) in incident light in reflection and in (b) in transmitted light in transmission,
  • FIG. 4 shows a further exemplary embodiment of the invention with an alternative sequence of the embossed micromirror structures and the multicolored flat structure
  • FIG. 5 shows a modification of the design of FIG. 4 with a partial second embossing
  • 6 shows an exemplary embodiment of a security element that closes a continuous opening in a banknote, with (a) schematically showing the appearance of the security element applied to the banknote in reflected light and (b) in transmitted light,
  • Fig. 7 schematically shows a cross-section of the security element of Fig. 6,
  • FIG. 1 shows a schematic representation of a banknote 10, which has a number of different security features and in particular with a printing element 11, a watermark 12, a window security thread 14 partially embedded in the banknote paper 13, a film strip 15, which has a continuous Opening 16 in the banknote paper closes, and a foil patch 17, which closes another continuous opening 18 of the banknote paper, is equipped.
  • the present invention relates in particular to the structure of the film elements 15, 17, each of which shows a combination of reflection motifs visible in reflected light and a multicolored transmission motif visible in the area of the opening 16 or 18 when viewed through.
  • the invention is not limited to film elements and banknotes, but can be used with all types of security elements, for example with labels Goods and packaging or when securing documents, ID cards, passports, credit cards, health cards and the like.
  • transfer elements such as patches with or without their own backing layer, for example security threads or security strips, are particularly suitable.
  • the security element 20 shown in cross section in FIG which the security element is applied. From a first viewing direction, the security element 20 shows a first optically variable effect, for example a curved representation of the denomination “20”, which appears in a first color, for example red. From a second viewing direction, the security element 20 shows a second optically variable effect, for example a curved depiction of a coat of arms that appears in a second color, for example blue.
  • a first optically variable effect for example a curved representation of the denomination “20”
  • a second optically variable effect for example a curved depiction of a coat of arms that appears 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 it is tilted back from the second to the first appearance.
  • the change in the reflection motif and the color takes place simultaneously and without an intermediate or transition stage in which both motifs or colors would be visible at the same time or one motif would be visible in the color of the other motif.
  • the appearance therefore jumps seamlessly between two appearances and is therefore referred to as a binary color and effect change.
  • the security element 20 also contains a transmission motif, which in practice becomes visible when viewed through the areas in which the security element 20 is applied over a transparent area or a continuous 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 and contains, in particular, two relief structures 34, 44 which are arranged in the z-direction at two specific, different height levels in relation to the planar carrier film 22.
  • a translucent, multicolored flat structure 70 is arranged between the two relief structures 34, 44, which has on the one hand a colorless transparent area 72 and on the other hand a multicolored color area 74 with two or more different chromatic colors.
  • the relief structures each represent micromirror embossings or micromirror arrangements 34, 44, 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 34, 44 produces a desired optically variable effect in each case after it has been coated.
  • the different levels of height of the micromirror arrangements are defined by the different heights of the base areas of the micromirror arrangements above the carrier film.
  • the micromirror arrangements 34, 44 are each provided with a reflection-increasing coating 36, 46, which produce the different color impression of the micromirror arrangements in reflected light when viewed.
  • the reflection-increasing coatings are formed, for example, by a red glazing color (coating 36) backed by an opaque metallization or a blue glazing color (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 respective coating 36, 46 has been applied and optionally structured, are leveled with a transparent top lacquer layer 38 or 48, respectively.
  • the top coat layers have essentially the same refractive index as the embossing coat layers 32, 42, so that the micromirrors do not appear visually in areas without a coating due to the lack of a refractive index difference between the embossing coat layer and the top coat layer.
  • the micromirror arrangement 34 that is closer to the viewer when viewing the reflection motifs in reflected light is also referred to as the higher micromirror arrangement
  • the micromirror arrangement 44 that is further away from the viewer is referred to as the lower-lying micromirror arrangement
  • the respective coatings are referred to as higher or lower lying reflection-increasing coating.
  • the reflection-increasing coatings 36, 46 are both not present over the entire surface, but are through recesses in the Coatings 36, 46 create different sub-areas within the feature area with different appearances.
  • the reflection-increasing coating 36 of the higher-lying micromirror arrangement 34 is present in a first partial region 52 and reflects incident light 60 in a first viewing direction 62 given by the angle of inclination of the micromirror.
  • the shape of the first partial area 52 forms a first reflection motif, which is visible to the observer from the first viewing direction 62 mentioned, with a bright gloss and the hue 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 sub-areas that are separate from one another.
  • the reflection-increasing coating 36 is not present in the entire feature area 24 but has gaps 35 in which the viewer can see through the coating 36 .
  • the reflection-increasing coating 46 of the lower-lying micromirror arrangement 44 is present in a second partial region 54, which reflects incident light 60 in a second viewing direction 64 given by the angle of inclination of the micromirrors.
  • the shape of the second partial area 54 forms a second reflection motif, which is visible to the observer in the recesses 35 of the higher-lying coating 36 from the named second viewing direction 64 with a bright gloss and the hue of the second translucent color, blue in the exemplary embodiment .
  • the second sub-area 54 does not have to be contiguous either, but can be formed by a plurality of sub-areas that are separate from one another.
  • the color impression of the second reflection motif results from the hue of the second glazing color and the hue 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 in register with one another. so that the color impression of the second reflection pattern results from the blue-reflecting color of the underlying coating 46 .
  • the lower-lying reflection-increasing coating 46 is also not present in the entire feature area 24, but also has recesses 45 within the recesses 35 of the higher-lying reflection-increasing coating, in which the viewer can see through the coating tion 46 can look through.
  • the areas in which gaps 35, 45 of the two coatings 36, 46 lie one on top of the other form a transmission area 56 within the feature area 24, in which the incident light 60 passes through the two embossed lacquer layers and the flat structure 70 and as transmitted light 66 on the opposite side of the security element 20 can be perceived by the viewer.
  • the shape of the transmission area 56 forms a transmission motif whose color impression 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 given by the color impression of the color area 74 and is therefore two or more different Has chromatic colors.
  • the transmission area 56 does not have to be continuous either, but can be formed by a plurality of partial areas separated from one another, in which case the size of the partial areas can be above or below the resolution limit of the human eye.
  • FIG. 3 shows schematically the appearance of a security element according to the invention with a structure as in FIG. 2, in (a) in incident light in reflection and in (b) in transmitted light in transmission.
  • two reflection images 80, 82 can be seen, for example a first reflection image 80 made up of a number of geometric symbols (circle, triangle, square, pentagon), which have a first optically variable effect in the first, due to the higher coating 36 show given color.
  • the symbols can appear, for example, as shiny red symbols bulging upwards out of the plane.
  • a second reflection image 82 is formed, for example, by a scenery background with a second optically variable effect in a second color given by the deeper-lying coating 46 and appears, for example, as an inwardly curved, shiny blue shell.
  • the changing appearance of the two optically variable reflection images 80, 82 when the security element is tilted is noticeable and easily recognizable.
  • the two reflection images 80, 82 cannot be seen; the surface area occupied by these images appears rather darkly opaque.
  • the transmission motif 84 emerges, which appears light in the transmission area, for example in the form of a multicolored coat of arms with several chromatic colors, against the dark background 86 of the reflection image areas.
  • the transmission image in the exemplary embodiment in FIG. 3 has no optical variability. je According to the reflection properties of the color area 74 of the flat structure 70, the transmission motif 84 can also be visible in reflected 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, for example by means of a laser or otherwise, before, after or during the application.
  • the figure also shows the flat structure 70 as a full-area layer that includes the colorless transparent area 72 and the multicolored color area 74 .
  • the flat structure 70 may not be designed over the entire surface, for example only include the multicolored color area 74 (free area instead of transparent area) or include transparent areas and free areas.
  • FIG. 4 shows a further exemplary embodiment of the invention with an alternative sequence of the embossed micromirror structures and the multicolored flat structure, which does not require any particular matching of the flat structure areas to the partial areas with a reflection-increasing coating.
  • a light-transmitting, multicolored flat structure 92 is applied to a flat, transparent, colorless carrier film 22, which is embodied throughout as a colored structure with two or more chromatic colors.
  • Two embossing lacquer layers 32, 42 with embossed micromirror arrangements 34, 44, reflection-increasing coatings 36, 46 and leveling cover layers 38, 48 are arranged one above the other on the flat structure 92, as already described in principle in connection with FIG.
  • a transmission area 56 is also formed by overlapping gaps in the coatings 36, 46, in which the color impression of the security element is determined in transmission through the multicolored flat structure 92. As illustrated in FIG.
  • the transmission area 56 can contain both areas 56-1 in which the embossing lacquer layers 32, 42 with the micromirror embossings are present and only the coatings 36, 46 are left open, and areas 56-2 in which neither the embossing lacquer layers 32, 42 nor a coating 36, 46 are present.
  • the flat structure 90 is arranged below the lower-lying micromirror arrangement 44 in the design of FIG. 54 much lower. Care must only be taken that the desired motif parts of the flat structure 90 lie in the transmission area 56 .
  • the flat structure can also contain repeating or continuous multicolored motifs in which the precise relative position of the flat structure and the transmission area is not of great importance.
  • FIG. 5 illustrates a modification of the design of FIG. 4 with a second embossing over part of the area, which also does not make any special demands on the registration of the multicolored flat structure.
  • the security element 100 contains a flat, transparent, colorless carrier 102, the surface extent of which defines an xy plane and a z axis perpendicular thereto.
  • a multicolored feature area 104 is arranged on the carrier 102 and contains an embossed structure area with micromirror embossings with two different height levels.
  • a first embossed area is provided by micromirror embossings 114, the bases of which are at a first height Hi above the carrier 102, while a second embossed area, which is only present in certain areas, is provided by micromirror embossings 124, the bases of which are at a second height H2>Hi above the Carrier 102 are.
  • the height as well as the direction of the positive z-axis are measured starting from the carrier 102 . Since the security element 100 is designed to be viewed from the side of the carrier 102, the z-axis in the representation of FIG. 5 extends downward away from the carrier.
  • the micromirror arrangements 114, 124 are produced by embossing two different embossing lacquer layers 112, 122 with different color effects. While the embossing lacquer layer 112, into which the micromirror arrangement 114 is embossed, is transparent and colorless, the embossing lacquer layer 122, into which the micromirror arrangement 124 is embossed, is dyed glazing red. Both micromirror arrangements 114, 124 are provided with a uniform color coating HO, which in the exemplary embodiment is formed by an opaque metal coating, specifically, for example, by a thin, vapour-deposited aluminum layer.
  • the coated micromirror arrangements are leveled by a transparent cover layer 118 and a translucent multicolored flat structure 130 is arranged on the cover layer 118, which is continuous as a color structure is formed with two or more chromatic transmission colors.
  • the multicolored flat structure 130 advantageously has high transmission but little or no reflection.
  • micromirror embossings or micromirror arrangements 114, 124 each contain a large number of micromirrors which are inclined relative to the x-y plane and whose local angles of inclination are selected in such a way that the relief structures of the micromirror embossings 114, 124 interact with the color effects of the embossing lacquer layers 112, 122 and the color effect of the uniform color coating 110 produce the desired two reflection images as a visual appearance.
  • the micromirror arrangement 114 with the silvery metallic appearance of the aluminum layer 110 is visible from the viewing position 64, which generates a first, silvery, shiny reflection image when viewed in incident light . Due to the red translucent coloring of the second embossing lacquer layer 122 and the backing of the second embossing lacquer layer with the aluminum layer 110, the second reflection image appears from viewing position 62 with a shiny red appearance.
  • the second embossing lacquer layer 122 and the embossed second micromirror arrangement 124 are only partially present in the feature area.
  • the second embossing lacquer layer 122 can be present, for example, in the form of a regular or irregular grid on the first embossing lacquer layer 112, so that only the micromirror embossings 112 of height level Hi are present in the first grid areas 152, while in the second grid areas 154 the second embossing lacquer layer 122 is also present the microscopy gel embossing 124 are present at height level H2 and are optically effective.
  • the raster areas 152, 154 can form a chessboard pattern, for example, in which each field, ie each raster area 152, 154, has a dimension of, for example, 100 ⁇ m ⁇ 100 ⁇ m.
  • each field ie each raster area 152, 154
  • other grid configurations are also possible, for example grids with alternately arranged strip-shaped grid areas or with grid areas with other polygonal or irregular shapes.
  • the dimensions of the grid areas are preferably below the resolution limit of the human eye in one or both directions of the plane, so that the grid itself cannot be seen by the viewer.
  • the second embossing lacquer layer 122 with its embossed micromirror arrangement 124 can also be present in large-area partial areas 154 on the first embossing lacquer layer 112 and/or the feature area can have large-area partial areas 152 in which only the micromirror embossings 112 of the first embossing lacquer layer, as illustrated below with the aid of an example.
  • large-area sub-areas refers in particular to sub-areas with dimensions above the resolution limit of the human eye, which, in contrast to the grid areas described above, are recognizable as such to the viewer.
  • the feature area of the security element 100 also contains a transmission area 156 in which neither the second embossing lacquer layer 122 colored in a translucent manner nor the uniform color coating 110 is present.
  • the security element allows a look-through there, the color impression of the security element 100 being determined in transmission through the multicolored flat structure 130 .
  • the transmission area 156 can be formed by a plurality of raster areas below the resolution limit of the human eye. Alternatively or additionally, it can also have large-area sub-areas above the resolution limit of the human eye or can also be formed by just a single large-area sub-area.
  • FIG. 6 and 7 illustrate a more specific embodiment of a security element 160 which is formed on the basis of the design illustrated in FIG.
  • FIG. 6 schematically shows the appearance of the security element applied to the banknote 164 in incident light (FIG. 6(a)) or in transmitted light (FIG. 6(b)).
  • FIG. 7 schematically shows a cross section of the security element 160, the basic structure of the security element corresponding to that of FIG. 5, so that elements corresponding to one another are provided with the same reference symbols.
  • the security element 160 gives the observer the three-dimensional impression of a first reflection motif 166 seemingly arching out of the plane of the banknote 164 in reflected light, which appears with a first, for example shiny silver color impression.
  • the reflection motif 166 can, for example, represent a value number, a portrait or another graphic motif.
  • a movement effect with a second color impression is visible as a second reflection motif 168 in an S-shaped curved partial area.
  • a bright red bar can run back and forth within the S-shaped sub-area and produce a so-called rolling bar effect.
  • the areas of different color impression (first and second color impression) and different effects (three-dimensional motif or running bar) matched exactly to one another, which is also referred to as color-to-effect matching in this application.
  • the two reflection motifs 166, 168 cannot be seen; instead, a transmission motif 170 appears, which occupies the entire surface area of the security element 160 arranged above the opening 162.
  • the transmission motif 170 is formed by a true-color portrait, which appears light against a dark background when viewed through with a multiplicity of true colors.
  • the transmission motif 170 in the exemplary embodiment has no optical variability, in particular no movement effect and no three-dimensional appearance.
  • the security element 160 contains two large-area partial regions 176, 178 in the feature region, in which the micromirror arrangements 114, 124 are arranged directly adjacent to one another.
  • the detail shown in Fig. 7 shows a border area of the two partial areas 176, 178.
  • the partial area 178 is formed by an S-shaped curved strip, for example 5 mm wide and 2 cm long, within a surface area 176 that surrounds this partial area and is approximately 2 ⁇ 3 cm 2 , which essentially corresponds to the size of the security element 160 .
  • first embossing lacquer layer 112 with its micro-mirror embossing 114 is now present in the partial area 176 and is provided with a coating layer in a first Grid 140 applied opaque metal layer 110, for example a silver layer coated.
  • the coating grid 140 contains coating grid elements 141 and coating grid spaces 142, the dimensions of which are each below the resolution limit of the eye, for example between 80 ⁇ m and 120 ⁇ m.
  • first embossing lacquer layer 112 there is a layer sequence consisting of the glazing colored second embossing lacquer layer 122 with its micromirror embossing 124 and the opaque metal layer 110 .
  • This layer sequence is applied in the form of a second coating grid 145 and contains coating grid elements 146 and coating grid gaps 147 whose dimensions correspond to those of the first coating grid 140 .
  • the viewer When viewing in reflected light, the viewer looks in the partial area 178 in the raster elements 146 through the translucent red embossing lacquer layer 122 onto the micromirror arrangement 124 with the metal layer 110 lying at height level H2. In the surrounding area 176, on the other hand, the viewer looks in the raster elements 141 directly onto the micromirror arrangement 112 with its metal coating 110 lying on the level Hi, so that the visual impression is only determined by the color effect of the metal layer 110.
  • the viewer looks at the multicolored flat structure 130, which, however, hardly contributes to the image impression when viewed in incident light because of its low reflectivity.
  • the observer perceives the shiny silver motif 166 generated by the micromirror arrangement 114 in reflected light in the area 176, while the red-metallic shiny rolling bar effect 168 appears within the partial area 178, in which when the security - selements, a glowing red bar appears to run back and forth along the curved strip.
  • the coating grid elements 141, 146 When viewed in transmitted light, the coating grid elements 141, 146 appear dark because of the opaque metal coating 110, while the intermediate spaces 142, 147 of the coating grid each form light pixels of the transmission motif 170.
  • the transparency color of each pixel is given by the color of the flat structure 130 at the location of the transparency.
  • the flat structure 130 contains a true-color portrait, which is scanned by the pixels of the spaces 142, 147, so that the true-color portrait becomes visible as a composition of a large number of small, bright pixels when viewed through. Since the dimensions of the spaces 142, 147 and thus also the size of the bright pixels are below the resolution limit of the human eye, the composition of the transmission motif from individual pixels is not perceptible to the viewer without aids.
  • the translucent multicolor layer was designed as a flat structure for illustration purposes.
  • Figure 8 shows in (a) to (c) based on three variants that the translucent Multi-color layer can also follow the relief course of one or both relief structures.
  • FIG. 8(a) shows a security element 180 as a modification of the design in FIG. course of the lower-lying micromirror arrangement 44 follows.
  • the multicolored coating 182 has a colorless transparent area 184 and a multicolored colored area 186 with two or more different chromatic colors, the latter being arranged congruently with the transmission area 56 and thus determining its color impression in transmission.
  • the visual appearance of the security element 180 in FIG. 8(a) essentially corresponds to the appearance of the security element 20 in FIG.
  • FIG. 8(b) shows a security element 190 as a modification of the design in FIG.
  • the multicolored layer is designed as a translucent multicolored coating 192 which follows the relief profile of the lower-lying micromirror arrangement 44 applied to the underside of the film 22 and is thus arranged below the two micromirror arrangements 34, 44.
  • the multicolored coating 192 is continuously formed as a colored structure with two or more different chromatic colors.
  • the visual appearance of the security element 190 in FIG. 8(b) essentially corresponds to the appearance of the security element 90 in FIG. 4.
  • FIG. 8(c) shows, as a modification of the design of FIG. 5, a security element 200 with a partial surface second embossing.
  • the multicolored layer is designed as a translucent multicolored coating 202 which, in the partial areas in which the second embossing lacquer layer 122 is present, shows the relief profile of the second micromirror embossing 124, and in the partial areas in which only the first embossing lacquer layer 112 is present, the relief profile of the first micromirror embossing 114 follows.
  • the multicolored coating 202 is designed throughout as a colored structure with two or more different chromatic colors.
  • the visual appearance of the security element 200 in FIG. 8(c) essentially corresponds to the appearance of the security element 100 in FIG. 5.

Landscapes

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

Abstract

L'invention concerne un élément de sécurité optiquement variable (20) pour protéger des articles de valeur, la surface de l'élément définissant un axe z perpendiculaire à celui-ci, ledit élément comprenant une région caractéristique (24) partiellement réfléchissante et partiellement transmissive. La région caractéristique (24) contient une première sous-région (52) ayant un premier revêtement améliorant la réflexion (36), ladite première sous-région formant un premier motif de réflexion (80) qui est visible en réflexion, et ladite région caractéristique contient également une seconde sous-région (54) ayant un second revêtement améliorant la réflexion (46), ladite seconde sous-région formant un second motif de réflexion (82) qui est visible en réflexion. Les première et seconde sous-régions (50, 52) réfléchissent différemment la lumière incidente, les premier et second motifs de réflexion (80, 82) ayant une visibilité différente en fonction d'une direction de visualisation (62, 64). La région caractéristique (24) contient en outre une région de transmission (56) dans laquelle le premier et/ou le second revêtement améliorant la réflexion (36, 46) sont omis et qui forme un motif de transmission (84) qui est visible en transmission, multicolore, et apparaît avec au moins deux couleurs chromatiques en transmission.
PCT/EP2021/025381 2020-11-16 2021-10-04 Élément de sécurité optiquement variable ayant une région caractéristique réfléchissante/transmissive WO2022100881A1 (fr)

Priority Applications (1)

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EP21786769.6A EP4244070A1 (fr) 2020-11-16 2021-10-04 Élément de sécurité optiquement variable ayant une région caractéristique réfléchissante/transmissive

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DE102020007013.2A DE102020007013A1 (de) 2020-11-16 2020-11-16 Optisch variables Sicherheitselement mit reflektivem/transmissivem Merkmalsbereich
DE102020007013.2 2020-11-16

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WO2022100881A1 true WO2022100881A1 (fr) 2022-05-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4414180A1 (fr) * 2023-02-08 2024-08-14 Giesecke+Devrient Currency Technology GmbH Element de securite optiquement variable a zone de transmission et de reflexion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018005447A1 (de) * 2018-07-09 2020-01-09 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich
WO2020011391A1 (fr) 2018-07-09 2020-01-16 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optiquement variable à zone de surface réfléchissante
WO2020011392A1 (fr) 2018-07-09 2020-01-16 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optiquement variable à zone de surface réfléchissante

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012020550A1 (de) 2012-10-19 2014-04-24 Giesecke & Devrient Gmbh Optisch variables Flächenmuster
DE102019003947A1 (de) 2019-06-06 2020-12-10 Giesecke+Devrient Currency Technology Gmbh Verfahren zum Herstellen eines optisch variablen Sicherheitselements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018005447A1 (de) * 2018-07-09 2020-01-09 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement mit reflektivem Flächenbereich
WO2020011390A1 (fr) 2018-07-09 2020-01-16 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optiquement variable à zone de surface réfléchissante
WO2020011391A1 (fr) 2018-07-09 2020-01-16 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optiquement variable à zone de surface réfléchissante
WO2020011392A1 (fr) 2018-07-09 2020-01-16 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optiquement variable à zone de surface réfléchissante

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4414180A1 (fr) * 2023-02-08 2024-08-14 Giesecke+Devrient Currency Technology GmbH Element de securite optiquement variable a zone de transmission et de reflexion

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