EP3960481B1 - Élément de sécurité variable optiquement - Google Patents

Élément de sécurité variable optiquement Download PDF

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Publication number
EP3960481B1
EP3960481B1 EP21020423.6A EP21020423A EP3960481B1 EP 3960481 B1 EP3960481 B1 EP 3960481B1 EP 21020423 A EP21020423 A EP 21020423A EP 3960481 B1 EP3960481 B1 EP 3960481B1
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EP
European Patent Office
Prior art keywords
security element
surface region
security
effect pigments
pigments
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21020423.6A
Other languages
German (de)
English (en)
Other versions
EP3960481A8 (fr
EP3960481A1 (fr
Inventor
Christoph Mengel
Harald Lesch
Matthias Pfeiffer
Kai Herrmann SCHERER
Maik Rudolf Johann Scherer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
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Publication date
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Publication of EP3960481A1 publication Critical patent/EP3960481A1/fr
Publication of EP3960481A8 publication Critical patent/EP3960481A8/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
    • B42D25/20—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
    • 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
    • B42D25/305—Associated digital information
    • 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
    • B42D25/333—Watermarks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • 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
    • B42D25/369—Magnetised or magnetisable 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
    • B42D25/373—Metallic materials

Definitions

  • the invention relates to an optically variable security element for protecting valuables, which has a different visual appearance when viewed from the front and the back.
  • the invention also relates to a method for producing such a security element and a data carrier equipped with such a security element.
  • Data carriers such as valuable documents or identification documents, but also other valuables, such as branded goods, are often provided with security elements for protection, which allow the authenticity of the data carrier to be checked and which also serve as protection against unauthorized reproduction.
  • Security elements with a viewing angle-dependent or three-dimensional appearance play a special role in authenticity protection, as these cannot be reproduced even with the most modern copiers.
  • the security elements are equipped with optically variable elements that give the viewer a different image impression from different viewing angles and, for example, show a different color or brightness impression and/or a different graphic motif depending on the viewing angle.
  • the invention is based on the object of specifying a generic security element which combines attractive visual effects on both sides with a high degree of security against forgery.
  • a generic security element when viewed from the front and the back, a generic security element not only has a different visual appearance, but also shows common see-through information.
  • the security element is equipped with a front-side security feature with a first, translucent or transparent surface area and a second, opaque surface area, with the first surface area of the front-side security feature having a higher permeability for crosslinking radiation, in particular for UV radiation, than the second surface area and wherein the two surface areas produce the front-side visual appearance of the security element.
  • the security element is further equipped with an optically variable security feature on the back with a cross-linked effect layer with platelet-shaped, three-dimensionally aligned effect pigments, with a first and a second surface area in which the effect pigments are aligned in different ways and with the two surface areas having the different rear appearance of the security element generate.
  • the first surface area of the front security feature is arranged congruently with the first surface area of the rear security feature, with the two first surface areas generating the joint see-through information.
  • the mentioned higher permeability of the first surface area for crosslinking radiation allows the front security feature to be used as an exposure mask for selective crosslinking and thus hardening of the effect layer of the rear security element and thereby to produce different alignments of the effect pigments in the rear element congruent to the front element.
  • the crosslinking radiation is preferably UV radiation, but electron beams or high-energy visible radiation in the blue or violet spectral range can also be used.
  • the crosslinked effect layer is a crosslinkable layer that has been crosslinked and thus cured by the action of the crosslinking radiation.
  • the front security feature is also an optically variable security feature and is preferably a micro-optical one Relief element which has in particular a hologram, a matt structure, a micromirror arrangement, a microlens arrangement, a microfresnel lens arrangement, a moth eye structure, a sub-wavelength structure or a combination of these elements.
  • the micro-optical relief can in particular show a color change dependent on the tilt angle, a top-view color change, dynamic light-dark effects dependent on the tilt angle, run/flip effects, stereoscopic effects or rainbow effects.
  • the micro-optical relief element preferably contains a reflective coating which is formed by a reflector metal, a color-shifting thin-film element, a high-index layer or a combination of these elements.
  • the reflector metal can be formed, for example, by Al, Cr, In, Cu, by alloys or by a metal pigment color.
  • the color-shifting thin-film element has, in particular, a reflector/dielectric/absorber layer sequence, in which case the reflector layer can consist of aluminum, the dielectric spacer layer can consist of SiOx and the absorber layer can consist of chromium.
  • the high-index layer preferably has a refractive index of 1.8 or more, and in particular 2.0 or more, and can be formed of TiO 2 or ZnS, for example.
  • the reflective coating contains gaps, which are formed in particular in the form of characters, text, numbers, symbols, ornaments or combinations of these elements, and which produce the translucent or transparent surface area of the front security feature.
  • the gaps in the reflective coating can also represent the pixels or sub-pixels of a complex see-through image. Included grayscale transmission images can be obtained through a targeted local change in the demetallized pixel density.
  • the recesses can be produced, for example, by washing, etching, lasering, or other methods known per se. In a development of the invention, the recesses can also be individualized, for example by digital printing of wash/etching ink or laser demetallization.
  • the reflective coating may have gaps representing the pixels or sub-pixels of a pixel image.
  • the first surface area of the security feature on the back then has alignment areas that are congruent with these pixels or sub-pixels, so that the gaps mentioned produce a common see-through pixel image together with the congruent alignment areas.
  • Such a see-through pixel image is very difficult to see in plan from both the front and back and forms a hidden mark of authenticity that hardly disturbs the appearance of the front or back.
  • the security feature on the front can also contain a printed mask with regionally higher or lower permeability for the crosslinking radiation, preferably UV radiation, for example a mask made of a UV or electron beam absorber applied in certain areas.
  • a printed mask can be arranged, for example, on the rear side of the effect layer, so that it is only partially cured in the event of UV or electron beam exposure from the mask side.
  • watermarks in the form of electrotypes or thin areas of paper can also be used in order to transmit crosslinking radiation of different intensities in areas.
  • the front and rear security features are on opposite sides of a carrier which is transparent or translucent at least in the common see-through area.
  • the carrier can be perforated or contain transparent or translucent material areas.
  • the carrier can consist of paper, plastic or a composite material made of paper and plastic.
  • the carrier can also contain other security features known per se, such as watermarks, security fibers, a security thread, a security imprint or the like.
  • the platelet-shaped effect pigments are preferably oriented perpendicularly to the surface area of the effect layer in the first surface area of the rear security feature.
  • the aligned effect pigments then act like the raised slats of a blind, which allow a view through this surface area of the effect layer.
  • the effect pigments can be three-dimensionally aligned in a specific direction, but also in a direction that changes continuously over the location. There can also be other surface areas with a different orientation in some areas.
  • the effect layer appears essentially opaque to the second surface area due to an alignment of the effect pigments deviating from the vertical and has a three-dimensional appearance or produces a dynamic effect.
  • the effect pigments are advantageously formed by magnetically alignable magnetic pigments, preference being given to using metallized pigments, in particular aluminum or silver-coated pigments.
  • Pigments with a thin-film coating above all color-shifting pigments or aluminum pigments with a coloring coating produced by wet-chemical precipitation processes, are also suitable.
  • reflective metal pigments preferably aluminum pigments, with a translucent color coating, or pigments with a micro-optically active surface relief, for example a holographic surface relief, a micromirror relief, a microlens relief or a matte structure relief.
  • the aspect ratio of the platelet-shaped effect pigments can be described by the diameter-to-thickness ratio, which indicates the ratio of the largest to the smallest diameter of a pigment.
  • the diameters always run through the center of gravity of the pigment.
  • Spherical pigments have a constant diameter and thus a diameter-to-thickness ratio of 1. Values greater than 1 indicate anisotropic pigment shapes, in which the dimension of a pigment in a certain direction ("longitudinal direction") is larger, often even significantly larger than the dimension of the pigment in another direction (“transverse direction").
  • the effect pigments of the invention advantageously have a diameter-to-thickness ratio of more than 5:1, preferably more than 10:1, and more preferably more than 50:1 or even more than 100:1.
  • the largest diameter of the platelet-shaped effect pigments is preferably between 1 ⁇ m and 150 ⁇ m, preferably between 2 ⁇ m and 50 ⁇ m.
  • Platelet-shaped effect pigments are, for example, those in the publications EP 1 689 586 B1 , WO 2010/069823 A1 and WO 2013/090983 A1 described particles and pigments in question.
  • the effect pigments can also be formed by pigments that can be aligned using other interaction fields, in particular electric fields.
  • the effect layer with the platelet-shaped effect pigments has a machine-readable feature substance, at least in regions, in order to impart machine-readable properties to the security element.
  • the machine-readable feature substance can be both part of the effect pigments and part of a carrier medium in which the effect pigments are dispersed.
  • Feature substances with luminescent, for example fluorescent or phosphorescent properties, with IR-absorbing properties and/or magnetic properties are particularly suitable.
  • the security element on the front can also be equipped with machine-readable properties.
  • the above-mentioned reflective coating can contain a magnetic metal in certain areas.
  • the embossing lacquer layer, in which the relief is advantageously embossed, can also be mixed with a luminescent, IR-absorbing and/or magnetic feature substance.
  • the security element can be applied as a security thread in or as a film element (strip or patch) on a target substrate. After application to a target substrate, an external carrier film of the security element can be removed again or remain on the target substrate.
  • the security element can also be produced directly on a plastic substrate.
  • the crosslinkable effect layer is a UV-crosslinkable effect layer, which is exposed to UV radiation for crosslinking or curing and thus for fixing the alignment of the effect pigments.
  • the crosslinkable effect layer can also be a layer that can be crosslinked by an electron beam or by high-energy visible radiation in the blue or violet spectral range, which is then respectively exposed to an electron beam or high-energy visible radiation for crosslinking or curing and thus for fixing the alignment of the effect pigments .
  • the effect pigments are formed by magnetically alignable magnetic pigments and the magnetic pigments are aligned by magnetic fields from permanent magnets or electromagnets.
  • the effect pigments can also be formed by pigments which can be aligned with the aid of other interaction fields, for example electric fields.
  • the effect pigments can first be aligned parallel to the plane of the layer by means of an external alignment field before the first-mentioned alignment in the area surrounding the first surface area. Similarly, before the second-mentioned alignment, the effect pigments can advantageously be initially aligned parallel to the layer plane outside of the first surface area by means of an external alignment field.
  • the invention also includes a data carrier with a security element of the type described.
  • the data carrier can in particular be a document of value, such as a banknote, in particular a paper banknote, a polymer banknote or a foil composite banknote, a share, a bond, a certificate, a voucher , a check, a premium ticket, but also an identification card, such as a credit card, a bank card, a cash card, an authorization card, an ID card or a passport personalization page.
  • the security element can be a separate security element, for example a foil element, which is arranged in a transparent window area or a continuous opening of a data carrier.
  • the security element can also be a component of the data carrier itself and can comprise, for example, a transparent partial area of the data carrier, on the opposite main surfaces of which the front or rear security feature is arranged.
  • the security element described contains a motif, in particular a portrait and/or a denomination
  • the data carrier is equipped with at least one further security element with a different appearance that matches the motif of the former security element repeated.
  • a further security element can be formed, for example, by a watermark, a security thread or a printing element.
  • figure 1 shows a schematic representation of a bank note 10, wherein 1(a) the front and Fig.1(b) shows the back of the banknote.
  • the bank note 10 is equipped with a number of different security features and contains in particular a first printing element 12, a window security thread 16 partially embedded in the banknote paper 14, a watermark 18, a second printing element 20 and a film element 30 applied to the banknote paper 14 in a transparent window area.
  • the film element 30 contains a micro-optical relief with a metalized, opaque surface area 32 which, in the exemplary embodiment, represents a holographic portrait which corresponds to the portraits represented by the watermark 18 and the second printing element 20 .
  • the foil element 30 also contains a substantially transparent surface area 34 which is designed in the form of the denomination “20” of the banknote.
  • the denomination is also represented by the first printing element 12 and a part of the watermark 18 .
  • Such multiple use of the same motifs (portrait, denomination) in security features (printing element, watermark, metalized foil element) produced using different technologies (printing element, watermark, metalized foil element) achieves strong protection of the banknote 10 that is nevertheless easy to check even for the layperson.
  • the banknote paper 14 is provided with an optically variable magnetic feature 40 in the area of the front-side film element 30, which shows an effective, seemingly three-dimensional appearance, which is produced in the manner described in more detail below by an effect layer with differently aligned platelet-shaped magnetic pigments.
  • the magnetic feature 40 specifically contains three surface areas 42, 44, 46 with different orientations of the platelet-shaped magnetic pigments and correspondingly three surface areas with different appearances.
  • the first surface area 42 which is congruent with the essentially transparent surface area 34 of the film element 30 within the transparent window area of the banknote paper 14 and is therefore also in the form of the denomination “20”, is particularly important.
  • the magnetic pigments are aligned essentially perpendicularly to the substrate surface and therefore allow a view through the pigmented effect layer of the magnetic feature 40.
  • the first surface area 42 of the rear magnetic feature 40 and the transparent surface area 34 of the front film element 30 therefore produce common see-through information in the form the value "20" in the banknote 10.
  • the magnetic pigments each have a different spatial orientation.
  • the magnetic pigments are oriented parallel to the substrate surface in a region 46, which has the shape of a euro symbol, and are oriented rotationally symmetrically in a star-shaped region 44, with increasing tilting from the center to the edge relative to the vertical.
  • the surface areas 44, 46 appear opaque when the rear side is viewed and have an iridescent, three-dimensional appearance.
  • the foil element 30 and the magnetic feature 40 together with the intervening part of the banknote substrate 14 form an optically variable security element according to the invention in the banknote 10 which, when viewed from the front and the back, has a different visual appearance and shows a common look-through information.
  • FIG 2 the construction and production of optically variable security elements according to the invention are now described with reference to FIG 2 explained in more detail, the Fig. 2(e) schematically in cross section a finished security element 50 according to an embodiment of the invention and in Fig. 2(a) to (d) Shows intermediate steps in the production of this security element.
  • a micro-optical relief 54 is applied to a transparent area of a substrate 52, which in the exemplary embodiment consists of an embossing lacquer layer 56 with a desired hologram relief and a reflective, opaque metal coating 58.
  • the metal coating 58 is provided with recesses 60 in the form of the desired look-through information.
  • the recesses 60 of the metal coating 58 not only form a visually transparent area in the micro-optical relief 54, but also represent a UV-transparent area within the otherwise UV-impermeable metal coating.
  • an effect layer 62 is applied in a printing process, preferably by screen printing, which consists of a curable (crosslinkable) carrier medium 64 and magnetically alignable platelet-shaped effect pigments 66, which are dispersed in the carrier medium, as in Fig.2(a) shown.
  • the effect pigments 66 are then aligned perpendicularly to the substrate surface in the not yet cured state of the effect layer 62 using a magnet 70, at least in the area surrounding the recesses 60 of the metal coating 58, so that the effect pigments 68 there be in a state orthogonal to the substrate plane, as in Fig.2(b) shown.
  • the effect layer 62 with the aligned effect pigments 68 is then exposed to UV radiation 72 from a UV light source 74 from the opposite side through the micro-optical relief 54, as in FIG Fig.2(c) shown. Since the micro-optical relief 54 is only permeable to UV radiation in the cutouts 60, the effect layer 62 is cured by crosslinking only in a region 76 that is congruent with the cutouts 60, as indicated by cross-hatching in the figure. After this exposure step, the vertical alignment of the effect pigments 68 in the region 76 is fixed, while the effect pigments 66 lying outside of the region 76 are still movable.
  • Fig. 2(d) the still movable effect pigments are now brought into a different orientation with at least one further magnet 78 .
  • half effect pigments 80 are shown with an orientation parallel to the substrate plane, but it goes without saying that the effect pigments can also be oriented differently depending on the desired appearance, for example in one or more oblique directions, or also in one direction over the place continuously changing direction. Different alignments with different appearances can also be produced in regions, such as the surface regions 44, 46 of FIG Fig.1(b) .
  • the effect pigments 68 of the partial area 76 are already fixed in their alignment and therefore do not participate in this realignment by the magnet 78 .
  • the effect layer 62 is exposed to the UV radiation again, this time from the side of the effect layer 62 a further UV light source, not shown, applied and now fully cured.
  • the platelet-shaped effect pigments of the effect layer 62 act like the slats of a blind, which, depending on the tilted position, can allow a view through or block it completely or partially.
  • the effect layer 62 is translucent in the area 76 because of the orthogonal orientation of the effect pigments 68, while it appears essentially opaque in the other surface areas with a different orientation of the effect pigments 80.
  • the generated micro-optical relief 54 forms a front-side optically variable security feature with a transparent surface area in the form of the recesses 60 and an opaque surface area with the reflective opaque metallization 58.
  • the two surface areas produce the front-side visual appearance of the security element 50, such as a portrait and a number of in 1(a) shown Art.
  • the gaps 60 of the micro-optical relief 54 form the fine pixels of a see-through image that can only be seen through, but neither from the front nor the back of the security element and therefore hidden information in the security element forms.
  • the effect layer 62 forms an optically variable security feature on the back with effect pigments 66, 80, which are aligned in different ways in different surface areas.
  • the different surface areas produce the different rear appearance of the security element, for example the star-shaped area 44 containing the denomination number 42 and the euro symbol 46 of FIG Fig.1(b) .
  • the cutouts 60 in the front security feature and the surface area 76 of the rear security feature are arranged congruently with one another and generate the common see-through information with their shape. If the gaps 60 represent a pixel image at least in a partial area, then the surface area 76 is also configured as a corresponding pixel image in a partial area, so that when looking through the congruent arrangement of gaps 60 and surface area 76, the desired pixel transmission image is created as a hidden feature.
  • the effect pigments 66 are first aligned parallel to the surface of the substrate 52 by a further magnetic field before being aligned by the magnet 70 in order to have defined starting conditions for the further alignment.
  • Analog can with reference to Fig. 2(d) the effect pigments 80 are first aligned parallel to the surface of the substrate 52 by means of a further magnetic field before the alignment by the magnet 78 and only then is the desired three-dimensional alignment undertaken.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Optical Elements Other Than Lenses (AREA)

Claims (16)

  1. Élément de sécurité (50) variable optiquement destiné à sécuriser des objets de valeur qui, lors de l'observation depuis le côté avant et le côté arrière, présente respectivement un aspect visuel différent et indique une information en transparence commune, comprenant
    - une caractéristique de sécurité côté avant (30 ; 54), avec une première zone de surface (34 ; 60) translucide ou transparente, et une deuxième zone de surface (32 ; 58) opaque, la première zone de surface (34 ; 60) de la caractéristique de sécurité côté avant présentant une transparence plus élevée pour un rayonnement de réticulation, notamment pour un rayonnement UV, que la deuxième zone de surface (32 ; 58) et les deux zones de surface générant l'aspect visuel de côté avant de l'élément de sécurité,
    - une caractéristique de sécurité côté arrière (40) variable optiquement, avec une couche d'effet (62) réticulée ayant des pigments d'effet (68 ; 80) en forme de plaquettes à orientation tridimensionnelle, comprenant une première (42 ; 76) et une deuxième zone de surface (44 ; 46) dans lesquelles les pigments d'effet (68 ; 80) sont orientés de manière différente et les deux zones de surface générant l'aspect visuel de côté arrière différent de l'élément de sécurité,
    - la première zone de surface (34 ; 60) de la caractéristique de sécurité côté avant étant disposée de manière coïncidente avec la première zone de surface (42 ; 76) de la caractéristique de sécurité côté arrière, et les deux premières zones de surface (34, 42 ; 60, 76) générant l'information en transparence commune.
  2. Élément de sécurité selon la revendication 1, caractérisé en ce que la caractéristique de sécurité côté avant est une caractéristique de sécurité variable optiquement, de préférence un élément en relief microoptique, qui présente notamment un hologramme, une structure mate, un arrangement de micromiroirs, un arrangement de microlentilles, un arrangement de microlentilles de Fresnel, une structure d'oeil de papillon, une structure à sous-longueur d'onde ou une combinaison de ces éléments.
  3. Élément de sécurité selon la revendication 2, caractérisé en ce que l'élément en relief microoptique contient un revêtement réfléchissant, qui est formé par un métal réflecteur, un élément à couche mince à basculement de couleur, une couche à haut indice de réfraction ou une combinaison de ces éléments.
  4. Élément de sécurité selon la revendication 3, caractérisé en ce que le revêtement réfléchissant possède des creux, qui sont notamment réalisés en forme de signes, de texte, de nombres, de symboles, d'éléments ornementaux ou d'une combinaison de ces éléments, et qui génèrent la zone de surface translucide ou transparente de la caractéristique de sécurité côté avant.
  5. Élément de sécurité selon la revendication 3, caractérisé en ce que le revêtement réfléchissant possède des creux, qui représentent les pixels ou les pixels partiels d'une image en pixels, et la première zone de surface de la caractéristique de sécurité côté arrière possède des zones d'orientation en coïncidence avec ces pixels ou ces pixels partiels, de sorte que lesdits creux, conjointement avec les zones d'orientation en coïncidence, produisent une image de pixels en transparence commune.
  6. Élément de sécurité selon au moins l'une des revendications 1 à 5, caractérisé en ce que les caractéristiques de sécurité côté avant et côté arrière se trouvent sur des côtés opposés d'un élément porteur, lequel est transparent ou translucide au moins dans la zone de transparence commune.
  7. Élément de sécurité selon au moins l'une des revendications 1 à 6, caractérisé en ce que les pigments d'effet en forme de plaquettes dans la première zone de surface de la caractéristique de sécurité côté arrière sont orientés perpendiculairement à la l'étendue en surface de la couche d'effet.
  8. Élément de sécurité selon au moins l'une des revendications 1 à 7, caractérisé en ce que les pigments d'effet sont formés par des pigments magnétiques orientables magnétiquement.
  9. Élément de sécurité selon au moins l'une des revendications 1 à 8, caractérisé en ce que la couche d'effet avec les pigments d'effet en forme de plaquettes présente au moins dans certaines zones un matériau caractéristique lisible par machine afin de conférer à l'élément de sécurité des propriétés lisibles par machine.
  10. Élément de sécurité selon au moins l'une des revendications 1 à 9, caractérisé en ce que l'élément porteur se compose de papier, de matière plastique ou d'un matériau composite en papier et matière plastique.
  11. Procédé de fabrication d'un élément de sécurité variable optiquement selon l'une des revendications 1 à 10, qui, lors de l'observation depuis le côté avant et le côté arrière, présente respectivement un aspect visuel différent et indique une information en transparence commune, avec lequel
    - une caractéristique de sécurité côté ayant une première zone de surface translucide ou transparente, et une deuxième zone de surface opaque est générée sur le côté avant d'un élément porteur, la première zone de surface de la caractéristique de sécurité côté avant présentant une transparence plus élevée pour un rayonnement de réticulation, notamment pour un rayonnement UV, que la deuxième zone de surface,
    - une couche d'effet réticulable ayant des pigments d'effet en forme de plaquettes orientables de manière tridimensionnelle est appliquée sur le côté arrière de l'élément porteur,
    - les pigments d'effet en forme de plaquettes sont orientés au moyen d'un champ d'orientation externe, de préférence perpendiculairement à la surface du substrat, au moins dans la zone périphérique de la première zone de surface de la caractéristique de sécurité côté avant,
    - la couche d'effet réticulable avec les pigments d'effet orientés est soumise à un rayonnement de réticulation, notamment un rayonnement UV, à travers la caractéristique de sécurité côté avant qui agit en tant que masque d'exposition, de sorte que la couche d'effet réticulable n'est réticulée que dans une zone de surface en coïncidence avec la première zone de surface et les pigments d'effet sont ainsi bloqués dans leur orientation,
    - les pigments d'effet en forme de plaquettes en dehors de la première zone de surface sont orientés d'une manière différente au moyen d'un champ d'orientation externe, et
    - la couche d'effet réticulable avec les pigments d'effet orientés de manière différente est soumise à un rayonnement de réticulation, notamment un rayonnement UV, de sorte que la couche d'effet réticulable est entièrement réticulée et les pigments d'effet orientés de manière différente sont ainsi bloqués dans leur orientation.
  12. Procédé selon la revendication 11, caractérisé en ce que les pigments d'effet sont formés par des pigments magnétiques orientables magnétiquement et les pigments magnétiques sont orientés par les champs magnétiques d'aimants permanents ou d'électroaimants.
  13. Support de données comprenant un élément de sécurité selon au moins l'une des revendications 1 à 12.
  14. Support de données selon la revendication 13, caractérisé en ce que l'élément de sécurité représente un élément de sécurité séparé, lequel est disposé dans une zone de fenêtre transparente ou une ouverture permanente d'un support de données.
  15. Support de données selon la revendication 13, caractérisé en ce que l'élément de sécurité forme une partie intégrante du support de données lui-même.
  16. Support de données selon l'une des revendications 13 à 15, caractérisé en ce que l'élément de sécurité contient un motif, notamment un portrait et/ou une valeur et en ce que le support de données est équipé d'au moins un élément de sécurité supplémentaire ayant un aspect différent du motif du premier élément de sécurité mentionné.
EP21020423.6A 2020-08-27 2021-08-23 Élément de sécurité variable optiquement Active EP3960481B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020005268.1A DE102020005268A1 (de) 2020-08-27 2020-08-27 Optisch variables Sicherheitselement

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EP3960481A1 EP3960481A1 (fr) 2022-03-02
EP3960481A8 EP3960481A8 (fr) 2022-06-08
EP3960481B1 true EP3960481B1 (fr) 2023-05-17

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CN (1) CN114103516B (fr)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0326576D0 (en) 2003-11-14 2003-12-17 Printetch Ltd Printing composition
US7654581B2 (en) * 2005-05-06 2010-02-02 Canadian Bank Note Company, Limited Security document with ultraviolet authentication security feature
GB0714141D0 (en) * 2007-07-19 2007-08-29 Rue De Int Ltd security device
DE102008036481A1 (de) * 2008-08-05 2010-02-11 Giesecke & Devrient Gmbh Verfahren zur Herstellung von Sicherheitselementen mit zueinander gepasserten Motiven
WO2010069823A1 (fr) 2008-12-19 2010-06-24 Basf Se Flocons d'aluminium minces
DE102009024447A1 (de) 2009-06-10 2010-12-16 Giesecke & Devrient Gmbh Sicherheitselement mit veränderbarem optischen Erscheinungsbild
DE102010035313A1 (de) 2010-08-25 2012-03-01 Giesecke & Devrient Gmbh Sicherheitselement mit ausgerichteten Magnetpigmenten
AU2011101684B4 (en) 2011-12-22 2012-08-16 Innovia Security Pty Ltd Optical Security Device with Nanoparticle Ink
GB201301790D0 (en) * 2013-02-01 2013-03-20 Rue De Int Ltd Security devices and methods of manufacture thereof
GB201301788D0 (en) * 2013-02-01 2013-03-20 Rue De Int Ltd Security devices and methods of manufacture thereof
DE102015008971A1 (de) * 2015-07-10 2017-01-12 Giesecke & Devrient Gmbh Sicherheitselement und Datenträger
DE102016004238A1 (de) * 2016-04-08 2017-10-12 Giesecke+Devrient Currency Technology Gmbh Sicherheitsdokument mit Durchsichtsfenster
GB2567811B (en) * 2017-10-19 2020-06-17 De La Rue Int Ltd Security devices, security articles, security documents and methods for their manufacture

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Publication number Publication date
EP3960481A8 (fr) 2022-06-08
EP3960481A1 (fr) 2022-03-02
CN114103516B (zh) 2023-03-14
CN114103516A (zh) 2022-03-01
DE102020005268A1 (de) 2022-03-03

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