EP3212429B1 - Security element having a color-tilting thin-layer element - Google Patents

Security element having a color-tilting thin-layer element Download PDF

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Publication number
EP3212429B1
EP3212429B1 EP15790459.0A EP15790459A EP3212429B1 EP 3212429 B1 EP3212429 B1 EP 3212429B1 EP 15790459 A EP15790459 A EP 15790459A EP 3212429 B1 EP3212429 B1 EP 3212429B1
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EP
European Patent Office
Prior art keywords
metallization
layer
recesses
security
thin
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EP15790459.0A
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German (de)
French (fr)
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EP3212429A1 (en
Inventor
Christian Schmitz
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Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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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
    • B42D15/00—Printed matter of special format or style not otherwise provided for

Definitions

  • the invention relates to a security element with a color-shifting thin-film element for securing valuables.
  • the invention also relates to a method for producing such a security element and a data carrier with such a security element.
  • Data carriers such as documents of value or identity documents, or other valuable objects, such as branded articles, are often provided with security elements for security purposes, which allow the authenticity of the data carriers to be checked and which at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing angle-dependent effects play a special role in ensuring authenticity, since these cannot be reproduced even with the most modern copying machines.
  • the security elements are equipped with optically variable elements that convey a different image impression to the viewer 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 color shift effect in such thin-film elements is based on viewing angle-dependent interference effects due to multiple reflections in the different sub-layers of the element.
  • the path difference of the light reflected from the different layers depends on the one hand on the optical thickness of a dielectric spacer layer, which defines the distance between a semi-transparent absorber layer and a reflection layer, and on the other hand varies with the respective one Viewing angle. Since the path difference is of the order of magnitude of the wavelength of visible light, an angle-dependent color impression results for the viewer due to the extinction and amplification of certain wavelengths.
  • a suitable choice of material and thickness of the dielectric spacer layer enables a multitude of different color shift effects to be designed.
  • the object of the invention is to provide a security element of the type mentioned at the outset with a high level of security against forgery and an attractive visual appearance.
  • a security element for securing valuables contains a carrier and a metallization arranged above the carrier with first cutouts in the form of patterns, characters or a coding.
  • a color-shifting thin-film element is arranged above the metallization, which has second cutouts in the form of patterns, characters or a coding, in which the metallization is at least partially visible.
  • the metallization does not have to be present directly on the carrier, but there may be one or more intermediate layers between the carrier and the metallization, for example the embossing lacquer layer mentioned below.
  • the color-shifting thin-film element is preferably arranged directly on the metallization, ie without intermediate layers.
  • the first and second cutouts represent information which is complementary or related to one another, so as to closely mesh the cutout areas with one another.
  • the security element is advantageously transparent or translucent.
  • the metallization is preferably formed by an opaque or a semi-transparent metal layer, preferably by an opaque or a semi-transparent aluminum layer.
  • an opaque or a semi-transparent metal layer preferably by an opaque or a semi-transparent aluminum layer.
  • other metals such as silver, nickel, copper, iron, chromium or gold, can also be used for the metallization.
  • the thin-film element has a reflective layer arranged above the metallization, a dielectric spacer layer arranged above the reflective view and an absorber layer arranged above the dielectric spacer layer.
  • the metallization and the reflection layer of the thin-film element can be formed from different materials, but in an advantageous embodiment, the metallization and the reflection layer of the thin-film element are made from the same material, preferably from aluminum.
  • an embossing lacquer layer with an embossed relief structure is arranged between the carrier and the metallization.
  • the relief structure can in particular be a diffractive structure, such as a hologram, a holographic grating image or a hologram-like one Represent diffraction structure, or also an achromatic structure, such as a matt structure, a micromirror arrangement, a blaze grating with a sawtooth-like groove profile or a Fresnel lens arrangement.
  • the security element is advantageously a security thread, a tear thread, a security tape, a security strip, a patch or a label for application to a security paper, security document or the like.
  • the invention also includes a method for producing a security element of the type described above, in which a metallization with first cutouts in the form of patterns, characters or coding is applied to a carrier, optionally over one or more intermediate layers, and in which a color-shifting thin-film element with second cutouts in the form of patterns, characters or coding is applied to the metallization, so that the metallization is at least partially visible in the second cutouts.
  • a soluble washing ink in the form of the desired first recesses is printed on to produce the first recesses. After the metallization and the thin-film element have been applied, the wash color is washed off together with these using a solvent.
  • a soluble wash ink in the form of the desired second cutouts is printed. After the thin-film element has been applied, the wash color is washed off together with the latter by a solvent.
  • the invention also includes a data carrier with a security element of the type described above.
  • the data carrier can be a document of value, such as a banknote, in particular a paper banknote, a polymer banknote or a composite film banknote, a share, a bond, a certificate, a Voucher, a check, a high-quality admission ticket, but also an identification card, such as a credit card, bank card, cash payment card, authorization card, ID card or passport personalization page.
  • the security element is advantageously arranged at least in a partial area in or above a window area or a continuous opening of the data carrier.
  • FIG. 1 shows a schematic representation of a bank note 10 which is provided with a security element according to the invention in the form of a security thread 12.
  • the invention is not limited to security threads and banknotes, but can be used for all types of security elements, for example for labels on goods and packaging or for securing documents, ID cards, passports, credit cards, health cards and the like.
  • security threads for example, wide security strips or transfer elements can also be considered.
  • FIG. 2 shows a plan view of a partial area of the security thread 12
  • Fig. 3 represents a section through the security thread 12 along the line III-III of Fig. 2 represents.
  • the security thread 12 has a carrier 20 in the form of a transparent plastic film, for example a PET film.
  • a metallization 22 in the form of an opaque aluminum layer is applied, which is provided with first cutouts 24 in the form of the letter sequence "text", which represents any letter or character sequence.
  • a thin-layer element 30 with a color-shift effect is arranged on the non-recessed area of the metallization 22, which comprises a partially transparent absorber layer 32 made of chromium, a dielectric SiO 2 spacer layer 34 and a reflection layer 36 formed by an opaque aluminum layer.
  • the aluminum reflection layer 36 is applied directly to the opaque aluminum layer of the metallization 22.
  • the thin-film element 30 has second cutouts 38 in the form of the number sequence “200”, which represents the denomination of the banknote 10.
  • the security thread 12 When examining the security thread 12, three sub-areas with different visual appearances can be seen.
  • the security thread 12 In the first cutouts 24 of the metallization 22, the security thread 12 is transparent and provides a view of the areas of the banknote 10 lying underneath. Is the security thread 12 with one or more of the cutouts 24 above an opening or a window area 14 ( Fig. 1 ) applied to the banknote, a viewing area is created there in the banknote 10.
  • the viewer looks at the metallization 22, so that the security thread 12 has a silvery, shiny appearance there.
  • the color shift effect of the thin-film element 30 is visible in the remaining, not recessed areas, the color impression of the thin-film element 30 changing, for example, from magenta when viewed vertically to green when viewed obliquely.
  • both the metallization 22 and the reflection layer 36 of the thin-film element 30 are each formed by an aluminum layer, but it is also possible to use different, in particular differently colored metals here, for example copper for the metallization 22 and aluminum for the reflection layer 36.
  • a printing layer in the form of the desired first recesses 24 is first printed on a transparent PET film 20 with a washing ink and the film printed with washing ink is vapor-coated over its entire surface with an aluminum layer 22. Then, a printing layer in the form of the desired second cutouts 38 is printed on the aluminum layer 22 again with a washing ink and the film again printed with washing ink is coated in this order with the aluminum reflection layer 36, the SiO 2 spacer layer 34 and the chromium absorber layer 32 steamed. Subsequently, in a demetallization step, the printed wash color areas are washed off together with the layer areas lying above them, thereby producing the desired cutouts 24, 38 in the metallization 22 and the thin-film element 30.
  • Figure 4 shows as a further embodiment of the invention, a color shift hologram, in which the above-mentioned visual appearances are combined with an embossed hologram.
  • the security thread 40 contains a carrier 20 in the form of a transparent plastic film with a UV lacquer layer 42 which after it was applied with a relief 44 in the form of the desired hologram and was hardened.
  • the UV lacquer layer 42 is provided with a metallization 46 in the form of an opaque copper layer which has first cutouts 24 in the form of patterns, characters or a coding.
  • a thin-film element 30 with a color-shift effect is arranged on the non-recessed area of the metallization 46, which in particular, like the thin-film element of FIG Fig. 3 can be trained.
  • the thin-film element 30 is provided with second cutouts 38 in the form of patterns, characters or a coding.
  • the security thread 12 When looking at the security thread 40, three different visual appearances can be seen.
  • the security thread 12 In the first cutouts 24 of the metallization 22, the security thread 12 is transparent and provides a view of the areas of the banknote 10 lying underneath.
  • the relief structure 44 embossed into the lacquer layer 42 forms, together with the metallization 46, a copper-colored hologram which is visible in the second cutouts 38 of the thin-film element 30.
  • the relief of the lacquer layer 42 does not produce any visible diffraction effects in the first cutouts 24 because of the lack of contrast.
  • a hologram superimposed with the color shift effect of the thin-film element 30 is visible, in which the color impression of the security thread changes, for example, from magenta when viewed vertically to green when viewed obliquely.
  • FIG. 5 shows a further embodiment of the security thread according to the invention.
  • the carrier 20 has an embossing lacquer layer 42 which is only partially provided with an embossed relief structure.
  • a metallization 46, a dielectric spacer layer 34 and an absorber layer 32 are located on the embossing lacquer.
  • An additional reflection layer can optionally be provided between the metallization 46 and the dielectric spacer layer 34.
  • the metallization 46 has first recesses in the region of the embossing lacquer layer in which the embossing lacquer layer is not provided with an embossed relief structure (or additionally first recesses in the region of the embossing lacquer layer with an embossed relief structure).
  • the layers forming the color-shifting thin-film element ie the dielectric spacer layer 34 and the absorber layer 23, have second cutouts in the region of the embossing lacquer layer in which the embossing lacquer layer is provided with an embossed relief structure.
  • the viewer can see a transparent area "A" (so-called "clear text area") formed by the first cutouts.
  • the viewer recognizes a metallic, structured area "B", for example a hologram area, which is formed by the metallization having a relief.
  • the viewer recognizes two different color-shifting areas "C” and "D", the one color-shifting area “C” being arranged in the area of the embossing lacquer layer in which the embossing lacquer has no relief structure, and the further color-shifting area "D” in that Area of the embossing lacquer layer is arranged, in which the embossing lacquer layer is provided with a relief structure.
  • the hologram area can be used depending on the use of a water-soluble wash color (see step b) in the above summary of the invention in paragraph 13) for the first recess b) or not have a transparent recess in the form of a clear text.
  • the security element according to the invention can additionally be equipped with magnetic and / or fluorescent security features.

Description

Die Erfindung betrifft ein Sicherheitselement mit einem farbkippenden Dünnschichtelement zur Absicherung von Wertgegenständen. Die Erfindung betrifft auch ein Verfahren zum Herstellen eines derartigen Sicherheitselements und einen Datenträger mit einem solchen Sicherheitselement.The invention relates to a security element with a color-shifting thin-film element for securing valuables. The invention also relates to a method for producing such a security element and a data carrier with such a security element.

Datenträger, wie etwa Wert- oder Ausweisdokumente, oder andere Wertgegenstände, wie etwa Markenartikel, werden zur Absicherung oft mit Sicherheitselementen versehen, die eine Überprüfung der Echtheit der Datenträger gestatten und die zugleich als Schutz vor unerlaubter Reproduktion dienen. Eine besondere Rolle bei der Echtheitsabsicherung spielen Sicherheitselemente mit betrachtungswinkelabhängigen Effekten, da diese selbst mit modernsten Kopiergeräten nicht reproduziert werden können. Die Sicherheitselemente werden dabei mit optisch variablen Elementen ausgestattet, die dem Betrachter unter unterschiedlichen Betrachtungswinkeln einen unterschiedlichen Bildeindruck vermitteln und beispielsweise je nach Betrachtungswinkel einen anderen Farb- oder Helligkeitseindruck und/oder ein anderes graphisches Motiv zeigen.Data carriers, such as documents of value or identity documents, or other valuable objects, such as branded articles, are often provided with security elements for security purposes, which allow the authenticity of the data carriers to be checked and which at the same time serve as protection against unauthorized reproduction. Security elements with viewing angle-dependent effects play a special role in ensuring authenticity, since these cannot be reproduced even with the most modern copying machines. The security elements are equipped with optically variable elements that convey a different image impression to the viewer 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.

In diesem Zusammenhang ist bekannt, Sicherheitselemente mit mehrschichtigen Dünnschichtelementen einzusetzen, deren Farbeindruck sich für den Betrachter mit dem Betrachtungswinkel ändert (im Folgenden als Farbkippeffekt bezeichnet). Der Farbkippeffekt beruht bei solchen Dünnschichtelementen auf betrachtungswinkelabhängigen Interferenzeffekten durch Mehrfachreflexionen in den verschiedenen Teilschichten des Elements. Der Wegunterschied des an den verschiedenen Schichten reflektierten Lichts hängt einerseits von der optischen Dicke einer dielektrischen Abstandsschicht ab, die den Abstand zwischen einer semitransparenten Absorberschicht und einer Reflexionsschicht festlegt, und variiert andererseits mit dem jeweiligen Betrachtungswinkel. Da der Wegunterschied in der Größenordnung der Wellenlänge des sichtbaren Lichts liegt, ergibt sich aufgrund von Auslöschung und Verstärkung bestimmter Wellenlängen ein winkelabhängiger Farbeindruck für den Betrachter. Durch eine geeignete Wahl von Material und Dicke der dielektrischen Abstandsschicht können eine Vielzahl unterschiedlicher Farbkippeffekte gestaltet werden.In this context, it is known to use security elements with multilayer thin-film elements, the color impression of which changes for the viewer with the viewing angle (hereinafter referred to as the color shift effect). The color shift effect in such thin-film elements is based on viewing angle-dependent interference effects due to multiple reflections in the different sub-layers of the element. The path difference of the light reflected from the different layers depends on the one hand on the optical thickness of a dielectric spacer layer, which defines the distance between a semi-transparent absorber layer and a reflection layer, and on the other hand varies with the respective one Viewing angle. Since the path difference is of the order of magnitude of the wavelength of visible light, an angle-dependent color impression results for the viewer due to the extinction and amplification of certain wavelengths. A suitable choice of material and thickness of the dielectric spacer layer enables a multitude of different color shift effects to be designed.

Beispiele von konventionellen Sicherheitselementen und entsprechenden Herstellungsverfahren sind in WO03/091042-A2 , WO03/053714-A1 und WO2012/143746-A1 offenbart.Examples of conventional security elements and corresponding manufacturing processes are in WO03 / 091042-A2 , WO03 / 053714-A1 and WO2012 / 143746-A1 disclosed.

Ausgehend davon liegt der Erfindung die Aufgabe zugrunde, ein Sicherheitselement der eingangs genannten Art mit hoher Fälschungssicherheit und attraktivem visuellen Erscheinungsbild anzugeben.Proceeding from this, the object of the invention is to provide a security element of the type mentioned at the outset with a high level of security against forgery and an attractive visual appearance.

Diese Aufgabe wird durch die Merkmale der unabhängigen Ansprüche gelöst. Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.This object is solved by the features of the independent claims. Developments of the invention are the subject of the dependent claims.

Beschreibung der ErfindungDescription of the invention

Gemäß der Erfindung enthält ein Sicherheitselement zur Absicherung von Wertgegenständen einen Träger und eine über dem Träger angeordnete Metallisierung mit ersten Aussparungen in Form von Mustern, Zeichen oder einer Codierung. Über der Metallisierung ist ein farbkippendes Dünnschichtelement angeordnet, das zweite Aussparungen in Form von Mustern, Zeichen oder einer Codierung aufweist, in denen zumindest teilweise die Metallisierung sichtbar ist.According to the invention, a security element for securing valuables contains a carrier and a metallization arranged above the carrier with first cutouts in the form of patterns, characters or a coding. A color-shifting thin-film element is arranged above the metallization, which has second cutouts in the form of patterns, characters or a coding, in which the metallization is at least partially visible.

Die Metallisierung muss nicht direkt auf dem Träger vorliegen, sondern es können sich eine oder mehrere Zwischenschichten zwischen dem Träger und der Metallisierung befinden, beispielsweise die weiter unten genannte Prägelackschicht. Das farbkippendes Dünnschichtelement ist vorzugsweise direkt, also ohne Zwischenschichten, auf der Metallisierung angeordnet.The metallization does not have to be present directly on the carrier, but there may be one or more intermediate layers between the carrier and the metallization, for example the embossing lacquer layer mentioned below. The color-shifting thin-film element is preferably arranged directly on the metallization, ie without intermediate layers.

In einer vorteilhaften Ausgestaltung stellen die ersten und zweiten Aussparungen einander ergänzende oder aufeinander bezogene Informationen dar, um so die Aussparungsbereiche eng miteinander zu verzahnen.In an advantageous embodiment, the first and second cutouts represent information which is complementary or related to one another, so as to closely mesh the cutout areas with one another.

In den Bereichen der ersten Aussparungen ist das Sicherheitselement mit Vorteil transparent oder transluzent.In the areas of the first cutouts, the security element is advantageously transparent or translucent.

Die Metallisierung ist bevorzugt durch eine opake oder eine semitransparente Metallschicht gebildet, vorzugsweise durch eine opake oder eine semi-transparente Aluminiumschicht. Grundsätzlich kommen für die Metallisierung jedoch auch andere Metalle, wie etwa Silber, Nickel, Kupfer, Eisen, Chrom, oder Gold in Betracht.The metallization is preferably formed by an opaque or a semi-transparent metal layer, preferably by an opaque or a semi-transparent aluminum layer. In principle, however, other metals, such as silver, nickel, copper, iron, chromium or gold, can also be used for the metallization.

Erfindungsgemäß weist das Dünnschichtelement eine über der Metallisierung angeordnete Reflexionsschicht, eine über der Reflexionssicht angeordnete dielektrische Abstandsschicht und eine über der dielektrischen Abstandsschicht angeordnete Absorberschicht auf.According to the invention, the thin-film element has a reflective layer arranged above the metallization, a dielectric spacer layer arranged above the reflective view and an absorber layer arranged above the dielectric spacer layer.

Die Metallisierung und die Reflexionsschicht des Dünnschichtelements können aus unterschiedlichen Materialien gebildet sein, in einer vorteilhaften Ausgestaltung sind die Metallisierung und die Reflexionsschicht des Dünnschichtelements allerdings aus demselben Material, vorzugsweise aus Aluminium, gebildet.The metallization and the reflection layer of the thin-film element can be formed from different materials, but in an advantageous embodiment, the metallization and the reflection layer of the thin-film element are made from the same material, preferably from aluminum.

Bei einer Weiterbildung der Erfindung ist zwischen dem Träger und der Metallisierung eine Prägelackschicht mit einer eingeprägten Reliefstruktur angeordnet. Die Reliefstruktur kann dabei insbesondere eine diffraktive Struktur, wie etwa ein Hologramm, ein holographisches Gitterbild oder eine hologrammähnliche Beugungsstruktur darstellen, oder auch eine achromatische Struktur, wie etwa eine Mattstruktur, eine Mikrospiegelanordnung, ein Blazegitter mit einem sägezahnartigen Furchenprofil oder eine Fresnellinsen-Anordnung.In a development of the invention, an embossing lacquer layer with an embossed relief structure is arranged between the carrier and the metallization. The relief structure can in particular be a diffractive structure, such as a hologram, a holographic grating image or a hologram-like one Represent diffraction structure, or also an achromatic structure, such as a matt structure, a micromirror arrangement, a blaze grating with a sawtooth-like groove profile or a Fresnel lens arrangement.

Das Sicherheitselement ist mit Vorteil ein Sicherheitsfaden, ein Aufreißfaden, ein Sicherheitsband, ein Sicherheitsstreifen, ein Patch oder ein Etikett zum Aufbringen auf ein Sicherheitspapier, Wertdokument oder dergleichen.The security element is advantageously a security thread, a tear thread, a security tape, a security strip, a patch or a label for application to a security paper, security document or the like.

Die Erfindung enthält auch ein Verfahren zum Herstellen eines Sicherheitselements der oben beschriebenen Art, bei dem auf einem Träger, gegebenenfalls über eine oder mehrere Zwischenschichten, eine Metallisierung mit ersten Aussparungen in Form von Mustern, Zeichen oder einer Codierung, aufgebracht wird, und bei dem über der Metallisierung ein farbkippenden Dünnschichtelement mit zweiten Aussparungen in Form von Mustern, Zeichen oder einer Codierung aufgebracht wird, so dass in den zweiten Aussparungen zumindest teilweise die Metallisierung sichtbar ist.The invention also includes a method for producing a security element of the type described above, in which a metallization with first cutouts in the form of patterns, characters or coding is applied to a carrier, optionally over one or more intermediate layers, and in which a color-shifting thin-film element with second cutouts in the form of patterns, characters or coding is applied to the metallization, so that the metallization is at least partially visible in the second cutouts.

Bei einer vorteilhaften Verfahrensführung wird zur Erzeugung der ersten Aussparungen eine lösliche Waschfarbe in Form der gewünschten ersten Aussparungen aufgedruckt. Die Waschfarbe wird nach dem Aufbringen der Metallisierung und des Dünnschichtelements zusammen mit diesen durch ein Lösungsmittel abgewaschen.In an advantageous procedure, a soluble washing ink in the form of the desired first recesses is printed on to produce the first recesses. After the metallization and the thin-film element have been applied, the wash color is washed off together with these using a solvent.

Weiter wird in einer vorteilhaften Verfahrensführung zur Erzeugung der zweiten Aussparungen eine lösliche Waschfarbe in Form der gewünschten zweiten Aussparungen aufgedruckt. Die Waschfarbe wird nach dem Aufbringen des Dünnschichtelements zusammen mit diesem durch ein Lösungsmittel abgewaschen.Furthermore, in an advantageous procedure for producing the second cutouts, a soluble wash ink in the form of the desired second cutouts is printed. After the thin-film element has been applied, the wash color is washed off together with the latter by a solvent.

Die Erfindung enthält schließlich auch einen Datenträger mit einem Sicherheitselement der oben beschriebenen Art. Bei dem Datenträger kann es sich um ein Wertdokument, wie eine Banknote, insbesondere eine Papierbanknote, eine Polymerbanknote oder eine Folienverbundbanknote, um eine Aktie, eine Anleihe, eine Urkunde, einen Gutschein, einen Scheck, eine hochwertige Eintrittskarte, aber auch um eine Aüsweiskarte, wie etwa eine Kreditkarte, eine Bankkarte, eine Barzahlungskarte, eine Berechtigungskarte, einen Personalausweis oder eine Passpersonalisierungsseite handeln.Finally, the invention also includes a data carrier with a security element of the type described above. The data carrier can be a document of value, such as a banknote, in particular a paper banknote, a polymer banknote or a composite film banknote, a share, a bond, a certificate, a Voucher, a check, a high-quality admission ticket, but also an identification card, such as a credit card, bank card, cash payment card, authorization card, ID card or passport personalization page.

Mit Vorteil ist das Sicherheitselement dabei zumindest in einem Teilbereich in oder über einem Fensterbereich oder einer durchgehenden Öffnung des Datenträgers angeordnet.The security element is advantageously arranged at least in a partial area in or above a window area or a continuous opening of the data carrier.

Weitere Ausführungsbeispiele sowie Vorteile der Erfindung werden nachfolgend anhand der Figuren erläutert, bei deren Darstellung auf eine maßstabs- und proportionsgetreue Wiedergabe verzichtet wurde, um die Anschaulichkeit zu erhöhen.Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which scale and proportions have been omitted in order to increase clarity.

Es zeigen:

Fig. 1
eine schematische Darstellung einer Banknote mit einem erfindungsgemäßen Sicherheitselement in Form eines Sicherheitsfadens,
Fig. 2
eine Aufsicht auf einen Teilbereich des Sicherheitsfadens von Fig. 1,
Fig. 3
einen Querschnitt durch den Sicherheitsfaden von Fig. 2 entlang der Linie III-III,
Fig. 4
einen Querschnitt wie Fig. 3 für einen Sicherheitsfaden nach einem anderen Ausführungsbeispiel der Erfindung,
Fig. 5
ein weiteres Ausführungsbeispiel eines erfindungsgemäßen Sicherheitsfadens.
Show it:
Fig. 1
1 shows a schematic illustration of a banknote with a security element according to the invention in the form of a security thread,
Fig. 2
a supervision of a part of the security thread of Fig. 1 ,
Fig. 3
a cross section through the security thread of Fig. 2 along the line III-III,
Fig. 4
a cross section like Fig. 3 for a security thread according to another embodiment of the invention,
Fig. 5
a further embodiment of a security thread according to the invention.

Die Erfindung wird nun am Beispiel von Sicherheitselementen für Banknoten erläutert. Figur 1 zeigt dazu eine schematische Darstellung einer Banknote 10, die mit einem erfindungsgemäßen Sicherheitselement in Form eines Sicherheitsfadens 12 versehen ist. Es versteht sich allerdings, dass die Erfindung nicht auf Sicherheitsfäden und Banknoten beschränkt ist, sondern bei allen Arten von Sicherheitselementen eingesetzt werden kann, beispielsweise bei Etiketten auf Waren und Verpackungen oder bei der Absicherung von Dokumenten, Ausweisen, Pässen, Kreditkarten, Gesundheitskarten und dergleichen. Bei Banknoten und ähnlichen Dokumenten kommen neben Sicherheitsfäden beispielsweise auch breite Sicherheitsstreifen oder Transferelemente in Betracht.The invention will now be explained using the example of security elements for banknotes. Figure 1 shows a schematic representation of a bank note 10 which is provided with a security element according to the invention in the form of a security thread 12. However, it goes without saying that the invention is not limited to security threads and banknotes, but can be used for all types of security elements, for example for labels on goods and packaging or for securing documents, ID cards, passports, credit cards, health cards and the like. In the case of banknotes and similar documents, in addition to security threads, for example, wide security strips or transfer elements can also be considered.

Der Aufbau und die prinzipielle Funktionsweise des Sicherheitsfadens 12 werden nun mit Bezug auf die Figuren 2 und 3 näher erläutert. Figur 2 zeigt dabei eine Aufsicht auf einen Teilbereich des Sicherheitsfadens 12, Fig. 3 stellt einen Schnitt durch den Sicherheitsfaden 12 entlang der Linie III-III der Fig. 2 dar.The structure and principle of operation of the security thread 12 will now be described with reference to FIG Figures 2 and 3 explained in more detail. Figure 2 shows a plan view of a partial area of the security thread 12, Fig. 3 represents a section through the security thread 12 along the line III-III of Fig. 2 represents.

Der Sicherheitsfaden 12 weist einen Träger 20 in Form einer transparenten Kunststofffolie, beispielsweise einer PET-Folie auf. Auf dem Träger 20 ist eine Metallisierung 22 in Form einer opaken Aluminiumschicht aufgebracht, welche mit ersten Aussparungen 24 in Form der Buchstabenfolge "Text" versehen ist, welche stellvertretend für eine beliebige Buchstaben- oder Zeichenfolge steht.The security thread 12 has a carrier 20 in the form of a transparent plastic film, for example a PET film. On the carrier 20 is a metallization 22 in the form of an opaque aluminum layer is applied, which is provided with first cutouts 24 in the form of the letter sequence "text", which represents any letter or character sequence.

Auf dem nicht ausgesparten Bereich der Metallisierung 22 ist ein Dünnschichtelement 30 mit Farbkippeffekt angeordnet, das eine teiltransparente Absorberschicht 32 aus Chrom, eine dielektrische SiO2-Abstandsschicht 34 und eine durch eine opake Aluminiumschicht gebildete Reflexionsschicht 36 umfasst. Die Aluminium-Reflexionsschicht 36 ist dabei direkt auf die opake Aluminiumschicht der Metallisierung 22 aufgebracht. Das Dünnschichtelement 30 weist zweite Aussparungen 38 in Form der Ziffernfolge "200" auf, die die Denomination der Banknote 10 darstellt.A thin-layer element 30 with a color-shift effect is arranged on the non-recessed area of the metallization 22, which comprises a partially transparent absorber layer 32 made of chromium, a dielectric SiO 2 spacer layer 34 and a reflection layer 36 formed by an opaque aluminum layer. The aluminum reflection layer 36 is applied directly to the opaque aluminum layer of the metallization 22. The thin-film element 30 has second cutouts 38 in the form of the number sequence “200”, which represents the denomination of the banknote 10.

Bei der Betrachtung des Sicherheitsfadens 12 sind drei Teilbereiche mit unterschiedlicher visueller Erscheinung erkennbar. In den ersten Aussparungen 24 der Metallisierung 22 ist der Sicherheitsfaden 12 transparent und gibt den Blick auf darunterliegende Bereiche der Banknote 10 frei. Ist der Sicherheitsfaden 12 mit einer oder mehreren der Aussparungen 24 über einer Öffnung oder einem Fensterbereich 14 (Fig. 1) der Banknote aufgebracht, so entsteht dort ein Durchsichtsbereich in der Banknote 10.When examining the security thread 12, three sub-areas with different visual appearances can be seen. In the first cutouts 24 of the metallization 22, the security thread 12 is transparent and provides a view of the areas of the banknote 10 lying underneath. Is the security thread 12 with one or more of the cutouts 24 above an opening or a window area 14 ( Fig. 1 ) applied to the banknote, a viewing area is created there in the banknote 10.

In den zweiten Aussparungen 38 des Dünnschichtelements 30 blickt der Betrachter auf die Metallisierung 22, so dass der Sicherheitsfaden 12 dort ein silbrig glänzendes Erscheinungsbild zeigt. In den restlichen, nicht ausgesparten Bereichen ist der Farbkippeffekt des Dünnschichtelements 30 sichtbar, wobei der Farbeindruck des Dünnschichtelements 30 beispielsweise von Magenta bei senkrechter Betrachtung zu Grün bei schräger Betrachtung wechselt.In the second cutouts 38 of the thin-film element 30, the viewer looks at the metallization 22, so that the security thread 12 has a silvery, shiny appearance there. The color shift effect of the thin-film element 30 is visible in the remaining, not recessed areas, the color impression of the thin-film element 30 changing, for example, from magenta when viewed vertically to green when viewed obliquely.

Im Ausführungsbeispiel sind sowohl die Metallisierung 22 als auch die Reflexionsschicht 36 des Dünnschichtelements 30 jeweils durch eine Aluminiumschicht gebildet, es ist jedoch auch möglich, hier unterschiedliche, insbesondere verschiedenfarbige Metalle zu verwenden, beispielsweise Kupfer für die Metallisierung 22 und Aluminium für die Reflexionsschicht 36.In the exemplary embodiment, both the metallization 22 and the reflection layer 36 of the thin-film element 30 are each formed by an aluminum layer, but it is also possible to use different, in particular differently colored metals here, for example copper for the metallization 22 and aluminum for the reflection layer 36.

Zur Herstellung des Sicherheitsfadens 12 wird beispielsweise auf eine transparente PET-Folie 20 zunächst mit einer Waschfarbe eine Druckschicht in Form der gewünschten ersten Aussparungen 24 aufgedruckt und die mit Waschfarbe bedruckte Folie vollflächig mit einer Aluminiumschicht 22 bedampft. Dann wird auf die Aluminiumschicht 22 wieder mit einer Waschfarbe eine Druckschicht in Form der gewünschten zweiten Aussparungen 38 aufgedruckt und die erneut mit Waschfarbe bedruckte Folie wird in dieser Reihenfolge mit der Aluminium-Reflexionsschicht 36, der SiO2-Abstandsschicht 34 und der Chrom-Absorberschicht 32 bedampft. Anschließend werden in einem Demetallisierungsschritt die aufgedruckten Waschfarbenbereiche zusammen mit den jeweils darüber liegenden Schichtbereichen abgewaschen und dadurch die gewünschten Aussparungen 24, 38 in der Metallisierung 22 und dem Dünnschichtelement 30 erzeugt.To produce the security thread 12, for example, a printing layer in the form of the desired first recesses 24 is first printed on a transparent PET film 20 with a washing ink and the film printed with washing ink is vapor-coated over its entire surface with an aluminum layer 22. Then, a printing layer in the form of the desired second cutouts 38 is printed on the aluminum layer 22 again with a washing ink and the film again printed with washing ink is coated in this order with the aluminum reflection layer 36, the SiO 2 spacer layer 34 and the chromium absorber layer 32 steamed. Subsequently, in a demetallization step, the printed wash color areas are washed off together with the layer areas lying above them, thereby producing the desired cutouts 24, 38 in the metallization 22 and the thin-film element 30.

Figur 4 zeigt als weiteres Ausführungsbeispiel der Erfindung ein Farbkipp-Hologramm, bei dem die oben genannten visuellen Erscheinungsbilder mit einem Prägehologramm kombiniert sind. Figure 4 shows as a further embodiment of the invention, a color shift hologram, in which the above-mentioned visual appearances are combined with an embossed hologram.

Der Sicherheitsfaden 40 der Fig. 4 weist dabei bis auf die geprägte Lackschicht 42 denselben grundsätzlichen Aufbau wie der Sicherheitsfaden 12 der Figuren 2 und 3 auf. Der Sicherheitsfaden 40 enthält einen Träger 20 in Form einer transparenten Kunststofffolie mit einer UV-Lackschicht 42, die nach ihrem Aufbringen mit einem Relief 44 in Form des gewünschten Hologramms geprägt und gehärtet wurde. Die UV-Lackschicht 42 ist mit einer Metallisierung 46 in Form einer opaken Kupferschicht versehen, die erste Aussparungen 24 in Form von Mustern, Zeichen oder einer Codierung aufweist.The security thread 40 of the Fig. 4 except for the embossed lacquer layer 42, it has the same basic structure as the security thread 12 in FIG Figures 2 and 3 on. The security thread 40 contains a carrier 20 in the form of a transparent plastic film with a UV lacquer layer 42 which after it was applied with a relief 44 in the form of the desired hologram and was hardened. The UV lacquer layer 42 is provided with a metallization 46 in the form of an opaque copper layer which has first cutouts 24 in the form of patterns, characters or a coding.

Auf dem nicht ausgesparten Bereich der Metallisierung 46 ist ein Dünnschichtelement 30 mit Farbkippeffekt angeordnet, das insbesondere wie das Dünnschichtelement der Fig. 3 ausgebildet sein kann. Das Dünnschichtelement 30 ist mit zweiten Aussparungen 38 in Form von Mustern, Zeichen oder einer Codierung versehen.A thin-film element 30 with a color-shift effect is arranged on the non-recessed area of the metallization 46, which in particular, like the thin-film element of FIG Fig. 3 can be trained. The thin-film element 30 is provided with second cutouts 38 in the form of patterns, characters or a coding.

Bei der Betrachtung des Sicherheitsfadens 40 sind drei verschiedene visuelle Erscheinungsbilder erkennbar. In den ersten Aussparungen 24 der Metallisierung 22 ist der Sicherheitsfaden 12 transparent und gibt den Blick auf darunterliegende Bereiche der Banknote 10 frei.When looking at the security thread 40, three different visual appearances can be seen. In the first cutouts 24 of the metallization 22, the security thread 12 is transparent and provides a view of the areas of the banknote 10 lying underneath.

Die in die Lackschicht 42 eingeprägte Reliefstruktur 44 bildet zusammen mit der Metallisierung 46 ein kupferfarbenes Hologramm, das in den zweiten Aussparungen 38 des Dünnschichtelements 30 sichtbar ist. In den ersten Aussparungen 24 erzeugt das Relief der Lackschicht 42 wegen des fehlenden Kontrasts dagegen keine sichtbaren Beugungseffekte.The relief structure 44 embossed into the lacquer layer 42 forms, together with the metallization 46, a copper-colored hologram which is visible in the second cutouts 38 of the thin-film element 30. In contrast, the relief of the lacquer layer 42 does not produce any visible diffraction effects in the first cutouts 24 because of the lack of contrast.

In den restlichen, nicht ausgesparten Bereichen des Sicherheitsfadens ist ein mit dem Farbkippeffekt des Dünnschichtelements 30 überlagertes Hologramm sichtbar, bei dem der Farbeindruck des Sicherheitsfadens beispielsweise von Magenta bei senkrechter Betrachtung zu Grün bei schräger Betrachtung wechselt.In the remaining, not recessed areas of the security thread, a hologram superimposed with the color shift effect of the thin-film element 30 is visible, in which the color impression of the security thread changes, for example, from magenta when viewed vertically to green when viewed obliquely.

Figur 5 zeigt ein weiteres Ausführungsbeispiel des erfindungsgemäßen Sicherheitsfadens. Der Träger 20 weist eine Prägelackschicht 42 auf, die nur zum Teil mit einer eingeprägten Reliefstruktur versehen ist. Auf dem Prägelack befinden sich eine Metallisierung 46, eine dielektrische Abstandsschicht 34 und eine Absorberschicht 32. Eine zusätzliche Reflexionsschicht (siehe die Schicht 36 in den Figuren 3 und 4) kann optional zwischen der Metallisierung 46 und der dielektrischen Abstandsschicht 34 vorgesehen werden. Die Metallisierung 46 weist erste Aussparungen in dem Bereich der Prägelackschicht auf, in dem die Prägelackschicht nicht mit einer eingeprägten Reliefstruktur versehen ist (oder zusätzlich erste Aussparungen in dem Bereich der Prägelackschicht mit einer eingeprägten Reliefstruktur). Die das farbkippende Dünnschichtelement bildenden Schichten, d.h. die dielektrische Abstandsschicht 34 und die Absorberschicht 23, weisen zweite Aussparungen in dem Bereich der Prägelackschicht auf, in dem die Prägelackschicht mit einer eingeprägten Reliefstruktur versehen ist. In dem in der Figur 5 gezeigten Schichtaufbau, in dem die Prägelackschicht zum Teil eine Reliefstruktur aufweist, ist für den Betrachter ein durch die ersten Aussparungen gebildeter transparenter Bereich "A" (sogenannter "Cleartext-Bereich") erkennbar. Darüber hinaus erkennt der Betrachter einen metallischen, strukturierten Bereich "B", z.B. einen Hologramm-Bereich, der durch die ein Relief aufweisende Metallisierung gebildet wird. Zusätzliche erkennt der Betrachter zwei verschiedene farbkippende Bereiche "C" und "D", wobei der eine farbkippende Bereich "C" in dem Bereich der Prägelackschicht angeordnet ist, in dem der Prägelack keine Reliefstruktur aufweist, und der weitere farbkippende Bereich "D" in dem Bereich der Prägelackschicht angeordnet ist, in dem die Prägelackschicht mit einer Reliefstruktur versehen ist. Der Hologramm-Bereich kann je nach Einsatz einer wasserlöslichen Waschfarbe (siehe in der obigen Zusammenfassung der Erfindung im Absatz 13 der Schritt b)) für die erste Aussparung b) eine transparente Aussparung in Form eines Cleartext aufweisen oder nicht. Figure 5 shows a further embodiment of the security thread according to the invention. The carrier 20 has an embossing lacquer layer 42 which is only partially provided with an embossed relief structure. A metallization 46, a dielectric spacer layer 34 and an absorber layer 32 are located on the embossing lacquer. An additional reflection layer (see layer 36 in FIGS Figures 3 and 4th ) can optionally be provided between the metallization 46 and the dielectric spacer layer 34. The metallization 46 has first recesses in the region of the embossing lacquer layer in which the embossing lacquer layer is not provided with an embossed relief structure (or additionally first recesses in the region of the embossing lacquer layer with an embossed relief structure). The layers forming the color-shifting thin-film element, ie the dielectric spacer layer 34 and the absorber layer 23, have second cutouts in the region of the embossing lacquer layer in which the embossing lacquer layer is provided with an embossed relief structure. In the in the Figure 5 shown layer structure, in which the embossing lacquer layer partially has a relief structure, the viewer can see a transparent area "A" (so-called "clear text area") formed by the first cutouts. In addition, the viewer recognizes a metallic, structured area "B", for example a hologram area, which is formed by the metallization having a relief. In addition, the viewer recognizes two different color-shifting areas "C" and "D", the one color-shifting area "C" being arranged in the area of the embossing lacquer layer in which the embossing lacquer has no relief structure, and the further color-shifting area "D" in that Area of the embossing lacquer layer is arranged, in which the embossing lacquer layer is provided with a relief structure. The hologram area can be used depending on the use of a water-soluble wash color (see step b) in the above summary of the invention in paragraph 13) for the first recess b) or not have a transparent recess in the form of a clear text.

Das erfindungsgemäße Sicherheitselement kann zusätzlich mit magnetischen und/oder fluoreszierenden Sicherheitsmerkmalen ausgestattet werden.The security element according to the invention can additionally be equipped with magnetic and / or fluorescent security features.

BezugszeichenlisteReference list

1010th
BanknoteBanknote
1212th
SicherheitsfadenSecurity thread
1414
FensterbereichWindow area
2020th
Trägercarrier
2222
MetallisierungMetallization
2424th
erste Aussparungenfirst cutouts
3030th
DünnschichtelementThin film element
3232
AbsorberschichtAbsorber layer
3434
AbstandsschichtSpacer layer
3636
ReflexionsschichtReflective layer
3838
zweite Aussparungensecond recesses
4040
SicherheitsfadenSecurity thread
4242
UV-LackschichtUV varnish layer
4444
Reliefrelief
4646
MetallisierungMetallization

Claims (14)

  1. A security element (12, 40) for securing objects of value (10), having a carrier (20), a metallization (22, 46) arranged above the carrier with first recesses (24) in the shape of patterns, characters or a coding, and a color-shifting thin-film element (30) arranged above the metallization (22, 46) and having second recesses (38) in the shape of patterns, characters or a coding, in which the metallization (22, 46) is visible at least partly, characterized in that the thin-film element (30) has a reflective layer (36) arranged above the metallization (22, 46), a dielectric spacer layer (34) arranged above the reflective layer (36) and an absorber layer (32) arranged above the dielectric spacer layer (34).
  2. The security element according to claim 1, characterized in that the first (24) and the second recesses (38) represent mutually complementing or mutually related information items.
  3. The security element according to claim 1 or 2, characterized in that the security element is transparent or translucent in the regions of the first recesses (24).
  4. The security element according to any of claims 1 to 3, characterized in that the metallization (22, 46) is formed by an opaque or a semi-transparent metal layer, preferably by an opaque or a semi-transparent aluminum layer.
  5. The security element according to at least one of claims 1 to 4, characterized in that the metallization (22, 46) and the reflective layer (36) of the thin-film element (30) are formed of the same material, preferably of aluminum.
  6. The security element according to at least one of claims 1 to 5, characterized in that between the carrier (20) and the metallization (22, 46) an embossing lacquer layer (42) with an embossed relief structure (44) is arranged, wherein the relief structure (44) represents in particular a diffractive structure, such as a hologram, a holographic grating image or a hologram-like diffractive structure, an achromatic structure, such as a matte structure, a micro-mirror arrangement, a blaze grating with a sawtooth-type groove profile or a Fresnel lens arrangement.
  7. The security element according to claim 6, wherein
    - the embossing lacquer layer (42) partly has an embossed relief structure (44);
    - the first recesses (24) in the metallization (22, 46) are arranged in a region in which the embossing lacquer layer (42) has no embossed relief structure (44);
    - the second recesses (38) in the color-shifting thin-film element (30) are arranged in a region in which the embossing lacquer layer (42) has an embossed relief structure (44).
  8. The security element according to at least one of claims 1 to 7, characterized in that the security element (12; 40) is a security thread, a tear-open thread, a security band, a security strip, a patch or a label for applying onto a security paper, value document or the like.
  9. A method for manufacturing a security element (12, 40) according to any of claims 1 to 8, wherein on a carrier (20), possibly above one or several intermediate layers, a metallization (22, 46) having first recesses (24) in the shape of patterns, characters or a coding is applied, and wherein above the metallization (22, 46) a color-shifting thin-film element (30) having second recesses (38) in the shape of patterns, characters or a coding is applied, so that in the second recesses (38) the metallization (22, 46) is visible at least partly.
  10. The method according to claim 9, characterized in that for manufacturing the first recesses (24) a soluble washing ink is imprinted in the shape of the desired first recesses (24), and that the washing ink is washed off after the application of the metallization (22, 46) and of the thin-film element (30) together with these by a solvent.
  11. The method according to claim 9 or 10, characterized in that for producing the second recesses (38) a soluble washing ink is imprinted in the shape of the desired second recesses (38), and that the washing ink is washed off after the application of the thin-film element (30) together with the same by a solvent.
  12. The method according to any of claims 9 to 11, comprising
    a) the application of an embossing lacquer layer (42) as intermediate layer onto the carrier, wherein the embossing lacquer layer (42) partly has an embossed relief structure (44);
    b) the application of a soluble washing ink in the shape of the desired first recesses (24) onto the embossing lacquer layer (42) in a region in which the embossing lacquer layer (42) has no embossed relief structure (44);
    c) the full-area application of the metallization (22, 46);
    d) the application of a soluble washing ink in the shape of the desired second recesses (38) onto the embossing lacquer layer (42) in a region in which the embossing lacquer layer (42) has an embossed relief structure (44);
    e) the full-area application of the color-shifting thin-film element (30), in particular the full-area application of a dielectric spacer layer (34), followed by a full-area application of an absorber layer (32), wherein optionally prior to the step of the full-area application of the dielectric spacer layer (34) the full-area application of a reflective layer (36) can be carried out;
    f) the washing off of the soluble washing inks applied in the steps b) and d) together with the metallization (22, 46) applied thereon and the color-shifting thin-film element (30) applied thereon.
  13. A data carrier (10) having a security element (12, 40) according to at least one of claims 1 to 8.
  14. The data carrier (10) according to claim 13, characterized in that the security element (12, 40) is arranged at least in a partial region in or above a window region or a through opening (14) of the data carrier (10).
EP15790459.0A 2014-10-29 2015-10-28 Security element having a color-tilting thin-layer element Active EP3212429B1 (en)

Applications Claiming Priority (3)

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DE102014016027 2014-10-29
DE102015003185.6A DE102015003185A1 (en) 2014-10-29 2015-03-12 Security element with color-shifting thin-film element
PCT/EP2015/002142 WO2016066263A1 (en) 2014-10-29 2015-10-28 Security element having a color-tilting thin-layer element

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EP3212429B1 true EP3212429B1 (en) 2020-04-29

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EP4311683A1 (en) * 2022-07-29 2024-01-31 Giesecke+Devrient Currency Technology GmbH Security element and valuable document equipped with the security element

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CN114905881B (en) * 2021-02-10 2023-08-22 中钞特种防伪科技有限公司 Security element, method for producing the same, and security product

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BRPI0215181B1 (en) * 2001-12-21 2015-10-13 Giesecke & Devrient Gmbh method for producing a security element
DE10202035B4 (en) * 2002-01-18 2018-10-18 Giesecke+Devrient Currency Technology Gmbh Security element with color shift effect and magnetic properties, article with such a security element and method for producing the security element and the article.
DE10218897A1 (en) * 2002-04-26 2003-11-06 Giesecke & Devrient Gmbh Security element and process for its manufacture
DE102007061828A1 (en) * 2007-12-20 2009-06-25 Giesecke & Devrient Gmbh Security element and method for its production
WO2012143746A1 (en) * 2011-04-21 2012-10-26 ALTSHULER, Vladimir Security label (versions), method of forming a security label and method of product authentication (versions)

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EP4311683A1 (en) * 2022-07-29 2024-01-31 Giesecke+Devrient Currency Technology GmbH Security element and valuable document equipped with the security element

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DE102015003185A1 (en) 2016-05-04
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