EP4121299B1 - Élément de sécurité plat présentant des caractéristiques de sécurité optique - Google Patents

Élément de sécurité plat présentant des caractéristiques de sécurité optique Download PDF

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Publication number
EP4121299B1
EP4121299B1 EP21712759.6A EP21712759A EP4121299B1 EP 4121299 B1 EP4121299 B1 EP 4121299B1 EP 21712759 A EP21712759 A EP 21712759A EP 4121299 B1 EP4121299 B1 EP 4121299B1
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EP
European Patent Office
Prior art keywords
sub
surface region
security element
wavelength structure
wavelength
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Active
Application number
EP21712759.6A
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German (de)
English (en)
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EP4121299C0 (fr
EP4121299A1 (fr
Inventor
Stephan Trassl
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Hueck Folien GmbH
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Hueck Folien GmbH
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Publication of EP4121299A1 publication Critical patent/EP4121299A1/fr
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Publication of EP4121299B1 publication Critical patent/EP4121299B1/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
    • B42D25/324—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
    • B42D25/328—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
    • B42D25/36—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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials

Definitions

  • the invention relates to a two-dimensional security element with optical security features, comprising at least one first surface area with a first sub-wavelength structure, wherein the structure elements that define the first sub-wavelength structures are repeated periodically in the plane of the security element.
  • the periodic repetition can take place in one direction, that is to say in one dimension, for example when a structural element comprises a straight wall and a plurality of such walls are arranged periodically next to one another.
  • the periodic repetition can take place in two directions, ie in two dimensions, for example when a structural element comprises a column and a plurality of columns are arranged in a grid, or when a structural element comprises a depression and a plurality of depressions are arranged in a grid.
  • the planar security element has a so-called basic element structure in a first planar area, which conveys different color impressions when viewed from the front and back due to the sub-wavelength structure, and in a second planar area also the basic element structure, albeit in a mirrored form with respect to the first planar area, whereby the first and second areas show a motif from both sides in a plan view, but the motif is not recognizable when viewed through.
  • a lattice basic structure in the first surface area and an inverted lattice basic structure in the second surface area are now disclosed in a first variant.
  • a substrate with mutually inverted interference coatings in the first and in the second surface area is shown.
  • the DE 10 2012 015 900 A1 thus makes it possible due to the two different surface areas with mutually inverted basic element structure to convey a motif through two different color impressions in a top view, ie when reflected on a surface of the security element.
  • the DE 10 2009 056933 A1 shows a security element according to the preamble of claim 1 with color filters where a sub-wavelength structure is provided with an interference coating.
  • An object of the invention is to provide an alternative security element with optical security features that has increased security against forgery, is easy to produce and can also convey a motif using at least two different color impressions.
  • the starting point of the invention is a two-dimensional security element with optical security features, comprising at least one first surface area with a first sub-wavelength structure, the structural elements that define the first sub-wavelength structure being repeated periodically in the plane of the security element.
  • the first sub-wavelength structure is additionally provided with an interference coating for generating a color-shift effect, at least in a partial area of the first surface area.
  • Claim 1 defines the subject matter of the invention.
  • the color shift effect is that the color impression changes with the viewing angle, i.e. the interference coating changes color depending on the viewing angle.
  • This additional interference coating causes a further change in the color effect caused by the sub-wavelength structure. Since the effects are superimposed due to the sub-wavelength structure and the interference coating, this cumulative effect is difficult to produce using other methods, which increases the counterfeit security of the security element according to the invention.
  • an interference coating for generating a color-shift effect is understood to mean, in particular, a thin-layer arrangement that brings about a color-shift effect by means of thin-layer interference.
  • Security elements based on thin-film interference are, for example, from EP 1 558 449 A known.
  • One Interference coating for generating a color shift effect usually consists of at least two sub-layers: a dielectric layer and an absorber layer.
  • An additional reflection layer on the other side of the dielectric layer, ie opposite the absorber layer with respect to the dielectric layer reflects electromagnetic waves, here light in the visible range, and thus intensifies the interference effect.
  • the dielectric layer serves as a spacer layer, optionally between the reflection layer and the absorber layer.
  • the color shift effect occurs when the interference coating is viewed from the side of the absorber layer, i.e. when light falls through the absorber layer onto the dielectric layer.
  • Dielectric materials with a refractive index of less than or equal to 1.65 can be used for the dielectric layer of the interference coating, e.g. aluminum oxide (Al 2 O 3 ), metal fluorides, e.g. magnesium fluoride (MgF 2 ), aluminum fluoride (AlF 3 ), silicon oxide (SiO x ), silicon dioxide (SiO 2 ), cerium fluoride (CeF 3 ), sodium aluminum fluorides (e.g.
  • Na 3 AlF 6 or Na 5 Al 3 F 14 neodymium fluoride (NdF 3 ), lanthanum fluoride (LaF 3 ), samarium fluoride (SmF 3 ), barium fluoride (BaF 2 ), calcium fluoride ( CaF 2 ) , lithium fluoride (LiF), low-index organic monomers and/or low-index organic polymers.
  • NdF 3 neodymium fluoride
  • LaF 3 lanthanum fluoride
  • SmF 3 samarium fluoride
  • BaF 2 barium fluoride
  • CaF 2 calcium fluoride
  • LiF lithium fluoride
  • low-index organic monomers and/or low-index organic polymers LiF
  • dielectric materials with a refractive index greater than 1.65 can also be used for the dielectric layer of the interference coating, e.g. zinc sulfide (ZnS), zinc oxide (ZnO), titanium dioxide (TiO 2 ), carbon (C), indium oxide (In 2 O 3 ), indium tin oxide (ITO), tantalum pentoxide (Ta 2 O 5 ), cerium oxide (CeO 2 ), yttrium oxide (Y 2 O 3 ), europium oxide (Eu 2 O 3 ), iron oxides such as iron(II,III) oxide (Fe 3 O 4 ) and ferric oxide (Fe 2 O 3 ), hafnium nitride (HfN), hafnium carbide (HfC), hafnium oxide (HfO 2 ), lanthanum oxide (La 2 O 3 ), Magnesium Oxide (MgO), Neodymium Oxide (Nd 2 O 3 ), praseodymium oxide (Pr 6 O
  • a metallic layer can be used as the absorber layer of the interference coating, this being, for example, a pure metal layer or around a layer containing metallic clusters.
  • the absorber layer preferably comprises at least one metal from the group consisting of aluminum, gold, titanium, vanadium, cobalt, tungsten, niobium, iron, molybdenum, palladium, platinum, chromium, silver, copper, nickel, tantalum, tin and/or their alloys, for example gold/palladium, copper/nickel, copper/aluminum or chromium/nickel.
  • a metallic layer can optionally be used as the reflection layer of the interference coating, which preferably comprises at least one metal selected from the group consisting of aluminum, gold, chromium, silver, copper, tin, platinum, nickel and their alloys, for example nickel/chromium or copper/aluminium. It is also conceivable that the reflection layer contains a semiconductor, such as silicon. Finally, it is also conceivable that the reflection layer is produced by applying a printing ink with metallic pigments, preferably made of a metal from the group mentioned above.
  • the reflective layer is applied over the entire surface or partially by known methods such as spraying, vapor deposition, sputtering, or, for example, as a printing ink by known printing methods (gravure, flexographic, screen, digital printing), by painting, roller application methods, slot nozzles, dip (roll dip coating) or curtain application methods (curtain coating) and the like.
  • known methods such as spraying, vapor deposition, sputtering, or, for example, as a printing ink by known printing methods (gravure, flexographic, screen, digital printing), by painting, roller application methods, slot nozzles, dip (roll dip coating) or curtain application methods (curtain coating) and the like.
  • HRI layers which comprise a material with a refractive index greater than 1.5, can also be used as the reflection layer of the interference coating.
  • cholesteric liquid crystal layers combined with a dark, preferably black, printed layer or metallization can also be used as an interference coating to produce a color shift effect.
  • print layers with interference pigments or liquid-crystalline pigments can also be used as an interference coating to produce a color-shift effect.
  • the feature that the first sub-wavelength structure is additionally provided with an interference coating for generating a color shift effect at least in a partial area of the first surface area means that the interference coating can only partially or completely cover this first surface area. If only a portion of the first surface area is provided with an interference coating, two different colors can be seen in the first surface area. If the entire first surface area is provided with the interference coating, this only appears in one color at a specific viewing angle, but this is difficult to reproduce for different viewing angles because it changes to a second color at at least one other viewing angle.
  • the invention also includes the fact that there can be a plurality of first surface areas with a first sub-wavelength structure per security element. In this way, e.g. patterns from several separate pattern elements, or lettering from several letters can be produced. All possible variations of first surface areas are then possible: one or more first surface areas that are completely provided with an interference coating and/or one or more first surface areas that are only partially provided with an interference coating.
  • a flat security element has a small height or thickness compared to its length and width.
  • a flat security element can be a film or a plate, for example.
  • the flat security element is usually a constant Have height or thickness.
  • the first and second surfaces, which form the front and back of the security element, will generally be flat and arranged parallel to one another.
  • the sub-wavelength structures will usually run parallel to the plane of the security element, i.e. the directions of the periodic repetition of the structure elements are parallel to the plane of the security element, while the structure elements themselves, such as columns or depressions, can of course also extend normal to the plane of the security element and usually will.
  • Subwavelength structures are understood here to mean structures which are made up of structure elements which are repeated periodically at least in one plane of the security element, with a dimension of the individual structure element being below the wavelength of the light used.
  • the periodic repetition of the structural elements can take place in one direction, ie in one dimension, or in two directions, ie in two dimensions.
  • two-dimensionally periodic columnar structures or two-dimensionally periodic hole structures are known as subwavelength structures, such as those in FIG DE 10 2012 015 900 A1 be explained.
  • the pillars protrude from a layer, while the holes are realized by recesses in a layer. In this respect, columns are the negative form of the holes.
  • the diameter of the column or the hole in the hole structure is below the wavelength of the light used for illumination, which is usually visible light.
  • the height of the column or the depth of the hole is selected in such a way that certain wavelengths are extinguished and the reflected (and possibly transmitted) light has a different color to the incident light, usually white light. Another possibility would be to generate additional plasmons and thus achieve a further color shift of the light.
  • the sub-wavelength structures are realized using thin metal layers. That is, in the case of a pillar structure, the surfaces of the pillars and the area between the pillars that is at the height of the bottom of the pillars carry a metal layer, but not the side faces of the pillars, as far as production allows. Likewise, in the case of hole structures, the faces in which the holes are located and the bottom of the holes would become one Wear metal layer, but not the walls of the holes, as far as this is production-related possible.
  • the sub-wavelength structure is usually mainly formed by a layer of lacquer, e.g. made of UV lacquer, the surface of which is provided with a nanostructure, for example by means of an embossing process.
  • lacquer e.g. made of UV lacquer
  • the interference coating according to the invention is then applied to this structured lacquer layer. If this is a thin film arrangement comprising an absorber layer, a dielectric layer and a reflection layer, the metallic reflection layer could be used to additionally excite surface plasmons. Optionally, a thin dielectric layer can also be applied between the lacquer layer and the metallic reflection layer.
  • the interference coating is not a thin-layer arrangement with a dielectric and absorber layer and reflection layer
  • an additional metal layer to be applied to the sub-wavelength structure before the interference coating is applied in order to excite surface plasmons.
  • a thin dielectric layer can also be applied between the lacquer layer and the additional metal layer.
  • the metallic reflection layer or the additional metallic layer should preferably be deposited directionally, for example by thermal vapor deposition or sputter deposition. Due to the directional deposition of the metal, metal disks are formed on the bottom of the holes or on the pillars, while a perforated film of holes forms in the remaining area. Due to the electrical separation of the metal discs and the perforated hole film, surface plasmons can be excited by incident light. The excitation of the surface plasmons causes increased reflection or absorption in certain spectral ranges, which is associated with coloring.
  • the additional metal layer of the sub-wavelength structure can be composed of Al, Cu, Ag, Au, Pd, Pt, Sn, In or their alloys.
  • the sub-wavelength structure coated with the interference coating can be filled, e.g. with the same lacquer from which the sub-wavelength structure is constructed.
  • the periodicity of the subwavelength structure can be in the range of 200-500 nm
  • the diameter of the columns or holes or lattice openings can be in the range of 100-300 nm.
  • the height of the columns or the depth of the holes can be between 30 and 400 nm, in particular in the range of 150-250 nm, e.g. around 200 nm.
  • the dielectric layer typically has a thickness in the range 100-500 nm.
  • the thickness of the absorber layer is typically in the range 5-10 nm.
  • the optional reflective layer of the thin film assembly may typically have a thickness of 20-50 nm. A thickness of less than 20 nm would also be conceivable, e.g. 5-10 nm, although the reflection property is lower here.
  • the optional additional metal layer for excitation of surface plasmons can have a thickness of 5 to 100 nm, preferably a thickness below 40 nm, more preferably a thickness below 20 nm, e.g.
  • the security element can also comprise one or more surface areas which have neither a sub-wavelength structure nor an interference coating. These can then be printed with color and/or information, for example, or provided with other security features.
  • a non-structured surface area is located adjacent to a first surface area, which does not have a sub-wavelength structure, but has the same interference coating in at least a partial area as at least one partial area of the first surface area.
  • at least one continuous interference coating is present, which covers both surface areas with a sub-wavelength structure and surface area without a sub-wavelength structure.
  • a single continuous interference coating can cover all first surface areas of a sub-wavelength structure and all surface areas without a sub-wavelength structure.
  • the only continuous interference coating can extend over the entire flat security element.
  • a continuous interference coating can be manufactured more easily than several separate surface areas with an interference coating.
  • the security element comprises, in addition to a first surface area with a first sub-wavelength structure, at least a second surface area with a second sub-wavelength structure, the first surface area being arranged next to the second surface area, the structural elements which define the first and the second sub-wavelength structure and which are repeated periodically in the plane of the security element being different for the two surface areas.
  • three different colors can even be generated in reflected light for a specific viewing angle, once by the first sub-wavelength structure of the first surface area, once by the second sub-wavelength structure of the second surface area and once by the additional interference coating in a sub-area of the first surface area. If the entire first surface area is covered with the same interference coating, only two different colors can appear for a specific viewing angle, but the changing color of the first surface area for different viewing angles is difficult to reproduce.
  • the security element comprises, in addition to a first surface area with a first sub-wavelength structure, at least a second surface area with a second sub-wavelength structure, the first surface area being arranged next to the second surface area, the structural elements which define the first and second sub-wavelength structure and which repeat themselves periodically in the plane of the security element are the same for both surface areas, but are aligned in the first surface area towards a first surface of the security element and in the second surface area are aligned towards a second surface of the security element, which facing first surface.
  • three different colors can also be generated in incident light, once by the first sub-wavelength structure of the first area, once by the second sub-wavelength structure of the second area and once by the additional interference coating in a sub-area of the first area.
  • the entire first surface area is covered with the same interference coating, only two different colors can appear for a specific viewing angle, but the changing color of the first surface area for different viewing angles is difficult to reproduce.
  • the second sub-wavelength structure is additionally provided with an interference coating for generating at least part of the second surface area is provided with a color shift effect.
  • an interference coating for generating at least part of the second surface area is provided with a color shift effect.
  • the interference coating in the first area could also have a different layer structure (e.g. a different thickness of the spacer layer) than in the second area, so that the interference coating in the second area produces a different optical behavior and thus a different color than that in the first area.
  • a different layer structure e.g. a different thickness of the spacer layer
  • interference coatings can also be applied next to each other per surface area, ie on the same sub-wavelength structure, in order to produce correspondingly different colors per surface area due to the different layer structure of the interference coatings, for example.
  • one embodiment of the invention provides that the first sub-wavelength structure of a first surface area and/or optionally the second sub-wavelength structure of a second surface area have two or more different interference coatings side by side to produce a color-shift effect.
  • the term "different interference coatings" is to be understood in such a way that these each achieve a different color effect.
  • the different interference coatings can be constructed according to the same principle, for example they could all comprise a thin-layer arrangement with at least an absorber layer and a dielectric layer, but differ in material and/or thickness of the dielectric layer.
  • the different interference coatings may use different principles, such as one interference coating comprising a thin film arrangement, another Interference coating a cholesteric liquid crystal layer or layers with interference pigments or liquid crystalline pigments.
  • first and second surface areas can therefore adjoin one another directly, which enables the creation of a coherent, counterfeit-proof motif, or can be arranged at a distance from one another, which enables additional security features to be attached between the two surface areas.
  • the first surface area is arranged at a distance from the second surface area, with a non-structured surface area lying between the first and second surface area, which has no sub-wavelength structure.
  • the structural elements that define the first and second sub-wavelength structure include columns or holes and that the plane of the top surfaces of the columns in the first surface area corresponds to the plane of the surrounding surfaces of the columns in the second surface area, or that the plane of the bottoms of the holes in the first surface area corresponds to the plane of the surrounding surfaces of the holes in the second surface area.
  • the interference coating is applied directly to the sub-wavelength structure, at least in a surface area.
  • the interference coating will usually be applied directly to the sub-wavelength structure.
  • the sub-wavelength structure can also be applied to the interference coating. In both cases there are no further layers between the sub-wavelength structure and the interference coating; the sub-wavelength structure and the interference coating lie directly next to one another. However, it would also be conceivable for one or more further layers to be located between the sub-wavelength structure and the interference coating.
  • the effective depth of the sub-wavelength structure is smaller than the thickness of the interference coating.
  • the effective depth corresponds to the height of the structural elements.
  • the effective depth is the height of the column, for holes the effective depth is the depth of the hole.
  • the thickness of the interference coating corresponds to the sum of the thicknesses of the dielectric layer and the absorber layer.
  • the thickness of the interference coating corresponds to the sum of the thicknesses of the dielectric layer, absorber layer and reflection layer.
  • the security element according to the invention generally has a carrier substrate on which the sub-wavelength structure and the interference coating are applied.
  • carrier substrates are transparent carrier films, preferably flexible plastic films, for example made of polyimide (PI), polypropylene (PP), monoaxially oriented polypropylene (MOPP), biaxially oriented polypropylene (BOPP), polyethylene (PE), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyetherketone (PEK), polyethyleneimide (PEI), polysulfone (PSU), polyaryletherketone (PAEK), polyethylene naphthalate (PEN), liquid-crystalline polymers (LCP), polyester, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyamide (PA), polycarbonate (PC), cycloolefin copolymers (COC), polyoxymethylene (POM), acrylonitrile butadiene styrene (ABS), polyvinyl chlor
  • the carrier substrate preferably has a thickness of 5-700 ⁇ m, preferably 5-200 ⁇ m, particularly preferably 5-50 ⁇ m.
  • the security element containing the sub-wavelength structure and the interference coating can also be surface-treated, coated or laminated on one or both surfaces, for example coated or laminated with plastics, or lacquered in order to protect the security features present on the security element against mechanical, physical and/or protect against chemical influences.
  • a protective lacquer layer can, for example, be based on nitrocellulose, acrylates and their copolymers, polyamides and their copolymers, polyvinyl chloride and their copolymers, or consist of a crosslinking lacquer.
  • the security element can be provided with an adhesive layer on one or both sides in order to enable it to be fixed on or in a data carrier or documents of value. This adhesive layer can be in the form of either a heat seal, cold seal, or self-adhesive coating.
  • the security features according to the invention which are formed by sub-wavelength structures and interference coatings, can be applied to the carrier substrate in order to form the security element.
  • This security element can then, before or after a surface treatment, be made up and at least partially embedded as a strip, thread or patch in a data carrier or a document of value or applied to a data carrier or a document of value.
  • the invention also includes a data carrier or a document of value, e.g. a banknote, which has a security element according to the invention.
  • first surface area 1 shows the supervision of a flat security element 4, which is rectangular here.
  • first surface area 1 it has a first sub-wavelength structure.
  • No sub-wavelength structure is provided in the adjoining surface area; it is a non-structured surface area 3.
  • the boundary between the two surface areas 1, 3 is formed by the diagonal of the rectangle.
  • an interference coating 5 is now applied in a rectangular partial area of the security element 4, but not in the remaining part of the security element 4, see FIG 2 , where on the right an interference coating 5 covers slightly more than the right half of the security element 4.
  • the interference coating 5 here has the same properties everywhere, ie it is an interference coating that is common to both surface areas 1, 3 and has the same design.
  • the interference coating 5 therefore has the same thickness and the same structure everywhere. In this way, four different color effects can still be achieved.
  • first surface areas 1 with a first sub-wavelength structure can be present on a security element 4, and there can be many separate first surface areas 1 with a first sub-wavelength structure, with a coherent or many separate, non-structured surface areas 3 being located between and/or around these first surface areas 1.
  • all surface areas 1.3 can then be provided with the same continuous interference coating 5, or only some surface areas 1.3 can be completely or partially provided with a coherent, be covered over the entire surface interference coating 5.
  • several separate areas with interference coating 5 can be provided, which cover only the first surface areas 1 congruently.
  • the region or regions of the interference coating 5 do not completely coincide with the first surface regions 1 and form a pattern that is independent of it.
  • the security element 4 shown can be part of a document of value, for example cover a partial area of a document of value.
  • FIG. 12 shows a longitudinal section through the security element 4 in order to show the structure of the sub-wavelength structure and the interference coating 5.
  • FIG. The plane of the security element 4 thus runs horizontally here.
  • the first sub-wavelength structure is provided in the first surface area 1 . It consists of columns 8, which are repeated periodically, each with a period P, in two directions. Only the period P in the direction from left to right in the plane of the drawing can be seen here. The period in the direction normal to the plane of the drawing may be the same as or different from that in the plane of the drawing.
  • the height of the columns 8 corresponds to the effective depth T of the sub-wavelength structure.
  • the pillars 8 can have any desired cross-section, such as circular, oval, rectangular or square. The cross section should ideally be constant over the height of the column 8, as far as this is technically possible.
  • the dielectric layer 6 is then applied to this reflection layer 13 .
  • the absorber layer 7 is applied to the dielectric layer 6 .
  • the reflective layer 13 could be omitted.
  • a coating or lamination can then be applied to the absorber layer 7 .
  • the generally metallic reflection layer 13 of the interference coating 5 can also stimulate plasmonic effects.
  • the light would strike the security element from above, and the color effect that is caused by the sub-wavelength structure together with the interference coating would be visible in the reflected light, ie from above.
  • the light could also strike the security element from below (if the carrier substrate 12 is translucent).
  • the color effect caused by the sub-wavelength structure would also be visible in the reflected light, ie from below.
  • a color effect in transmission (if the carrier substrate 12 is translucent) cannot be ruled out.
  • the fourth sub-wavelength structure 4 shows a longitudinal section through a security element 4, which has two different sub-wavelength structures.
  • the first sub-wavelength structure is provided in the first surface area 1 .
  • a second sub-wavelength structure is provided in the second surface area 2, which differs from the first in that its columns 11 are less high and less wide. These columns 11 are also repeated periodically in two directions, each with a period that can be the same as or different from that normal to the plane of the drawing.
  • the period of the sub-wavelength structure of the first surface area 1 can be different from that of the second surface area 2 .
  • the two surface areas 1, 2 with sub-wavelength structures are separated by a non-structured surface area 3 without sub-wavelength structures. All three surface areas 1-3 are provided with the same interference coating 5.
  • non-structured surface area 3 could also be omitted, so that the first 1 and second surface area 2 directly adjoin one another. It can further surface areas with another sub-wavelength structure can also be provided.
  • figure 5 shows a longitudinal section through a security element 4, which has two different sub-wavelength structures.
  • both sub-wavelength structures are constructed using the same structural elements, namely columns 11, the columns 11, which are repeated periodically in two directions in the plane of the security element 4, are aligned in the first surface area 1 toward a first surface of the security element 4 and in the second surface area 2 toward a second surface of the security element 4, which is opposite the first surface.
  • Both surface areas 1.2 are provided with the same interference coating 5.
  • the two surface areas 1, 2 with sub-wavelength structures could also be separated by a non-structured surface area 3 without sub-wavelength structures.
  • the sub-wavelength structure of the second surface area 2 corresponds to that of FIG 4 .
  • the sub-wavelength structure of the first surface area 1 is mirrored here to that of the second surface area 2, specifically about a plane that is horizontal here.
  • the columns 11 of the first surface area 1 are directed downwards here and arise when the depressions in the carrier substrate 12 are filled.
  • the plane of the top surfaces 9 of the columns 11 in the first surface area 1 lies here in the plane of the surrounding surfaces 10 of the columns 11 in the second surface area 1.

Claims (11)

  1. Élément de sécurité plan (4) avec caractéristiques de sécurité optiques, comprenant au moins une première zone de surface (1) munie d'une première structure de sous-longueur d'onde, dans lequel les éléments de structure qui définissent la première structure de sous-longueur d'onde se répètent périodiquement dans le plan de l'élément de sécurité (4), dans lequel la première structure de sous-longueur d'onde d'au moins une partie de zone de la première zone de surface (1) est munie en outre d'un revêtement d'interférence (5) destiné à produire un effet de variation des couleurs, caractérisé en ce qu'à la limite d'une première zone de surface (1), il y a une zone de surface non structurée (3) qui ne présente pas de structure de sous-longueur d'onde mais présente, dans au moins une partie de zone, le même revêtement d'interférence (5) que dans au moins une partie de zone de la première zone de surface (1), la première zone de surface (1) et la zone de surface non structurée (3) produisant un motif grâce à au moins deux impressions colorées différentes.
  2. Élément de sécurité plan (4) selon la revendication 1, caractérisé en ce qu'il comprend, outre une première zone de surface (1) munie d'une première structure de sous-longueur d'onde, au moins une deuxième zone de surface (2) avec une deuxième structure de sous-longueur d'onde, la première zone de surface (1) étant disposée à côté de la deuxième zone de surface (2), les éléments de structure qui définissent la première structure de sous-longueur d'onde et la deuxième et qui se répètent périodiquement dans le plan de l'élément de sécurité (4) étant différents pour les deux zones de surface.
  3. Élément de sécurité plan (4) selon la revendication 1, caractérisé en ce qu'il comprend, outre une première zone de surface (1) avec une première structure de sous-longueur d'onde, au moins une deuxième zone de surface (2) avec une deuxième structure de sous-longueur d'onde, la première zone de surface (1) étant disposée à côté de la deuxième zone de surface (2), les éléments de structure qui définissent la première structure de sous-longueur d'onde et la deuxième et qui se répètent périodiquement dans le plan de l'élément de sécurité (4) étant les mêmes pour les deux zones de surface mais étant orientés vers une première surface de l'élément de sécurité dans la première zone de surface (1) et vers une deuxième surface de l'élément de sécurité, faisant face à la première surface, dans la deuxième zone de surface (2).
  4. Élément de sécurité plan (4) selon la revendication 2 ou 3, caractérisé en ce que la deuxième structure de sous-longueur d'onde d'au moins une partie de la deuxième zone de surface (2) est munie en outre d'un revêtement d'interférence (5) destiné à produire un effet de variation des couleurs.
  5. Élément de sécurité plan (4) selon l'une des revendications précédentes, caractérisé en ce que la première structure de sous-longueur d'onde d'une première zone de surface (1) et/ou, le cas échéant, la deuxième structure de sous-longueur d'onde d'une deuxième zone de surface (2) présentent côte à côte deux ou plusieurs revêtements d'interférence (5) différents pour produire un effet de variation des couleurs.
  6. Élément de sécurité plan (4) selon l'une des revendications 2 à 5, caractérisé en ce qu'au moins une première zone de surface (1) est disposée à la limite d'une deuxième zone de surface (2).
  7. Élément de sécurité plan (4) selon l'une des revendications 2 à 6, caractérisé en ce que la première zone de surface (1) est disposée à distance de la deuxième zone de surface (2), une zone de surface non structurée (3) dépourvue de structure de sous-longueur d'onde se trouvant entre la première zone de surface et la deuxième.
  8. Élément de sécurité plan (4) selon l'une des revendications 2 à 7, caractérisé en ce que les éléments de structure qui définissent la première structure de sous-longueur d'onde et la deuxième comprennent des colonnes (8, 11) ou des trous et le plan des aires de couverture des colonnes (8, 11) dans la première zone de surface (1) du plan correspond au plan des aires environnantes des colonnes (8, 11) dans la deuxième zone de surface (2) ou en ce que le plan des fonds des trous dans la première zone de surface (1) correspond au plan des surfaces entourant les trous dans la deuxième zone de surface (2).
  9. Élément de sécurité plan (4) selon l'une des revendications précédentes, caractérisé en ce que le revêtement d'interférence (5) est appliqué directement sur la structure de sous-longueur d'onde au moins dans une zone de surface (1, 2).
  10. Élément de sécurité plan (4) selon l'une des revendications précédentes, caractérisé en ce que la profondeur efficace (T) de la structure de sous-longueur d'onde est plus petite que l'épaisseur du revêtement d'interférence (5).
  11. Support de données ou document de valeur présentant un élément de sécurité selon l'une des revendications 1 à 10.
EP21712759.6A 2020-03-16 2021-03-15 Élément de sécurité plat présentant des caractéristiques de sécurité optique Active EP4121299B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50225/2020A AT523690B1 (de) 2020-03-16 2020-03-16 Flächiges Sicherheitselement mit optischen Sicherheitsmerkmalen
PCT/EP2021/056474 WO2021185729A1 (fr) 2020-03-16 2021-03-15 Élément de sécurité plat présentant des caractéristiques de sécurité optique

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EP4121299A1 EP4121299A1 (fr) 2023-01-25
EP4121299B1 true EP4121299B1 (fr) 2023-07-26
EP4121299C0 EP4121299C0 (fr) 2023-07-26

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US (1) US20230125767A1 (fr)
EP (1) EP4121299B1 (fr)
JP (1) JP2023523383A (fr)
AT (1) AT523690B1 (fr)
CA (1) CA3169081A1 (fr)
WO (1) WO2021185729A1 (fr)

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FR3135013A1 (fr) * 2022-04-27 2023-11-03 Idemia France Document de sécurité utilisable pour visualiser une image comprenant un film plasmonique avec des perforations

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AT413360B (de) 2002-08-06 2006-02-15 Hueck Folien Gmbh Verfahren zur herstellung von fälschungssicheren identifikationsmerkmalen
DE102007061979A1 (de) * 2007-12-21 2009-06-25 Giesecke & Devrient Gmbh Sicherheitselement
DE102009012300A1 (de) * 2009-03-11 2010-09-16 Giesecke & Devrient Gmbh Sicherheitselement mit mehrfarbigem Bild
DE102009041583A1 (de) * 2009-09-15 2011-03-17 Giesecke & Devrient Gmbh Dünnschichtelement mit Interferenzschichtaufbau
DE102009056933A1 (de) * 2009-12-04 2011-06-09 Giesecke & Devrient Gmbh Sicherheitselement mit Farbfilter, Wertdokument mit so einem solchen Sicherheitselement sowie Herstellungsverfahren eines solchen Sicherheitselementes
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DE102011115589A1 (de) * 2011-10-11 2013-04-11 Giesecke & Devrient Gmbh Sicherheitselement
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FR3014366B1 (fr) * 2013-12-05 2016-01-08 Continental Automotive France Procede de determination de l'empreinte d'un pneumatique de roue sur le sol
DE102014010751A1 (de) * 2014-07-21 2016-01-21 Giesecke & Devrient Gmbh Sicherheitselement mit Subwellenlängengitter
DE102014018551A1 (de) * 2014-12-15 2016-06-16 Giesecke & Devrient Gmbh Wertdokument
JP6520359B2 (ja) * 2015-04-30 2019-05-29 凸版印刷株式会社 表示体、物品、原版、および、原版の製造方法
DE102015010191A1 (de) * 2015-08-06 2017-02-09 Giesecke & Devrient Gmbh Sicherheitselement mit Subwellenlängengitter
KR102419708B1 (ko) * 2016-06-24 2022-07-11 도판 인사츠 가부시키가이샤 광학 디바이스, 표시체, 표시체 부착 디바이스, 광학 필터, 및 광학 디바이스의 제조 방법
DE102016013683A1 (de) * 2016-11-16 2018-05-17 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit Subwellenlängengitter
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DE102017130588A1 (de) * 2017-12-19 2019-06-19 Giesecke+Devrient Currency Technology Gmbh Wertdokument

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Publication number Publication date
AT523690A1 (de) 2021-10-15
US20230125767A1 (en) 2023-04-27
EP4121299C0 (fr) 2023-07-26
CA3169081A1 (fr) 2021-09-23
JP2023523383A (ja) 2023-06-05
EP4121299A1 (fr) 2023-01-25
AT523690B1 (de) 2022-03-15
WO2021185729A1 (fr) 2021-09-23

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