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EP3288770B1 - Élément de sécurité à structure multicouche - Google Patents

Élément de sécurité à structure multicouche Download PDF

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Publication number
EP3288770B1
EP3288770B1 EP16716825.1A EP16716825A EP3288770B1 EP 3288770 B1 EP3288770 B1 EP 3288770B1 EP 16716825 A EP16716825 A EP 16716825A EP 3288770 B1 EP3288770 B1 EP 3288770B1
Authority
EP
European Patent Office
Prior art keywords
layer
security element
element according
security
dielectric
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
EP16716825.1A
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German (de)
English (en)
Other versions
EP3288770B2 (fr
EP3288770A1 (fr
Inventor
Giselher Dorff
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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Filing date
Publication date
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Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3288770A1 publication Critical patent/EP3288770A1/fr
Publication of EP3288770B1 publication Critical patent/EP3288770B1/fr
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Publication of EP3288770B2 publication Critical patent/EP3288770B2/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives

Definitions

  • the invention relates to a security element for security papers, documents of value or the like, which consists of an interference-capable, multi-layered structure, wherein the interference-capable, multi-layered structure comprises a reflective layer, a dielectric layer and a partially transparent layer, wherein the dielectric layer between the reflective layer and the partially transparent layer is arranged.
  • a generic security element is for example from the WO 2005/108110 A1 or the WO 2005/038136 A1 known.
  • the viewer perceives a certain color, which changes with change of the viewing angle.
  • the cause of the color shift is an interference effect between the light rays reflected from the surface of the outer partially transmissive layer and the light rays which pass through the outer partially transmissive and middle dielectric layers and are reflected back from the reflection layer to the partially transmissive layer.
  • the light beams are then either transmitted to the outside or reflected again at the partially transparent layer, so that in this case the light beams are repeatedly reflected back and forth between the reflection layer and the partially transparent layer.
  • the light beams that have passed through the thin film layer have traveled a longer distance than the light beams reflected on the surface of the thin film layer, so that they are out of phase with each other when interfering with them.
  • the light beam is in the Thin-film layer traveled path of light rays of different lengths. This difference results from the path difference of the beams reflected multiple times within the thin film layer due to the angle of incidence. Therefore, the phase angle of the interfering light beams is different depending on the angle of incidence, so that depending on the angle of incidence different colors or hues of the resulting, perceived by the observer light beam result, a so-called color shift effect. Due to its mode of operation, such a generic security element is also referred to as a thin-film layer interference layer structure or as a color shift element.
  • the invention is therefore the object of developing a generic security element such that the disadvantages of the prior art is eliminated and the protection against counterfeiting is further increased.
  • the reflection layer of the interference-capable, multilayer structure is formed by a color layer or a further multilayer structure, wherein the color layer and the multilayer structure are configured such that they show a metallic hue in reflected light and a colorful hue in transmitted light.
  • a color layer with a metallic hue is a color layer which has a metallically reflecting surface with a metal-colored hue, which is preferably golden or golden, silver or silver-colored or bronze-colored.
  • a color layer with a colored hue is a color layer which has a single- or multi-colored surface, preferably a monochrome blue, a monochrome green or a monochrome red.
  • Transmitted light is present when the illumination of an object takes place from one side and the viewing from the other side.
  • Incident light is when the illumination and viewing are from the same side of an object.
  • the color layer contains platelet-shaped metallic particles whose longest edge length is 15 nm to 1000 nm and whose thickness is 2 nm to 100 nm, so that the color layer shows a golden hue in reflected light and a blue hue in transmitted light ,
  • the platelet-shaped metallic particles preferably have a longest edge length of 15 nm to 600 nm and particularly preferably 20 nm to 500 nm and a thickness of 2 nm to 40 nm and particularly preferably 4 nm to 30 nm.
  • a color layer is for example from the WO 2011/064162 A2 known and is also referred to as gold-blue color.
  • the invention thus replaces the reflection layer of a color shift element known from the prior art by a color layer with platelet-shaped metallic particles or by a further multilayer structure of at least two semitransparent mirror layers and at least one arranged between the at least two mirror layers dielectric layer.
  • reflected light both the color layer with platelet-shaped metallic particles and the further multi-layered structure show a golden hue, thus reflecting the incident light and acting like a reflection layer.
  • the security element according to the invention in reflected light shows the color-shifting effect known from the prior art.
  • transmitted light however, both the color layer with platelet-shaped metallic particles and the further multi-layered structure show a blue hue and reflect the incident light not or only insignificantly.
  • the security element according to the invention thus shows a blue hue and no color shift effect.
  • At least one of the dielectric layers of the interference-capable, multilayer structure consists of silicon dioxide (SiO 2 ).
  • the partially transparent layer of the interference-capable, multilayer structure preferably consists at least of chromium and / or nickel.
  • a dielectric layer may consist of a transparent printing layer having a constant thickness.
  • the invention further relates to a see-through security element for security papers, documents of value and the like, with a carrier and a security element according to the invention applied to the carrier.
  • a carrier is in particular a transparent or translucent plastic film.
  • a lacquer layer can be arranged between the security element and the carrier, which preferably consists of an embossing lacquer.
  • an embossing lacquer may be, for example, a UV lacquer, i. a lacquer which cures under the action of ultraviolet light, or a thermoplastic embossing lacquer. Diffractive structures, holograms or micromirrors are preferably embossed in this embossing lacquer.
  • the thickness of this lacquer layer is 1 ⁇ m to 12 ⁇ m, preferably 2 ⁇ m to 7 ⁇ m.
  • Translucency in the sense of this invention means that an object, such as the substrate or the plastic film, can transmit incident light in a certain proportion. If light strikes one side of the object, a certain portion of the light is transmitted to the other side of the object and exits there again. The greater the percentage of transmitted light, with respect to the incident light, the more translucent the object is. If the percentage is at least 90%, i. If the object allows the incident light to pass through almost unattenuated, as in the case of a window, the object is called transparent.
  • a security paper, document of value or the like is particularly preferably made of a substrate made of paper from cotton fibers, as used for example for banknotes, or from other natural fibers or from synthetic fibers or a mixture of natural and synthetic fibers, or from at least one plastic film.
  • the substrate consists of a combination of at least two superimposed and interconnected different substrates, a so-called hybrid.
  • the substrate is made of, for example, a combination of plastic film-paper plastic film, ie a paper substrate is covered on both sides by a plastic film, or a combination of paper-plastic film paper, ie a substrate made of a plastic film on each of its covered by paper on both sides.
  • the font DE 102 43 653 A9 in particular states that the paper layer usually has a weight of 50 g / m 2 to 100 g / m 2 , preferably from 80 g / m 2 to 90 g / m 2 .
  • any other suitable weight can be used.
  • Security papers, documents of value or the like in which a security element according to the invention can be used are, in particular, banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers that are subject to counterfeiting, such as passports and other identity documents, as well as cards such as credit - or debit cards whose card body has at least one layer of security paper and also product securing elements, such as labels, seals, packaging and the like.
  • the simplified term value document includes all the above materials, documents and product safeguards.
  • front side or “back side” of a substrate, security paper, or value document are relative terms, which may also be referred to as “the one" and “the opposite” sides, and which constitute the overwhelming portion of the overall surface of the substrate, security paper, or value document. Specifically, these terms do not include the side surfaces of a substrate, security paper, or value document which are negligibly small, and usually not with security elements, in a thickness of a substrate or value document which is only about a millimeter in card bodies or fractions of a millimeter in banknotes Coatings can be provided or can be. In particular, no see-through effects can be achieved with the side surfaces.
  • the security element according to the invention shows an observer in incident light and in transmitted light information.
  • Information in the sense of this invention is a pattern-shaped and visually perceptible coating. This can, for example, form a graphic image, an image, a number, a letter, a text or other characters.
  • the information consists of positive and / or negative motives.
  • a positive motif in this case a motif element is itself applied to the substrate, whereas in the case of a negative motif the area surrounding the motif element is applied to the substrate.
  • a positive subject is a letter printed in dark color on the light substrate.
  • a negative motif is, for example, a surface applied in a dark color to the substrate, which has an unprinted area in the form of a letter within the area.
  • Fig. 1 shows a side view of an inventive security element with a partially transparent layer 3 and a reflective layer 1, between which a dielectric layer 2 is arranged. These three layers together form a thin film layer interference layer structure.
  • the reflection layer 1 consists of a color layer which contains platelet-shaped metallic particles whose longest edge length is 15 nm to 1000 nm and whose thickness is 2 nm to 100 nm, so that this color layer shows a golden hue in reflected light and a blue hue in transmitted light.
  • the viewer 9 sees in incident light, i. with a lighting 11 from the front 7, a color shift effect, in which the color of the security element changes when tilting the security element, for example, from purple to green.
  • incident light i. E. when illuminated 12 from the back 8 of the security element, the color shift effect disappears and the viewer 9 sees the security element in a blue color.
  • a viewer 10 looking at the security element from the back 8 of the security element looks at the color layer with platelet-shaped metallic particles.
  • the viewer sees 9 in incident light, ie with a lighting 12 from the back 8, the security element in a golden color and in transmitted light, ie with a lighting 11 from the front 7, the security element in a blue color.
  • Fig. 2 shows a side view of a security element according to the invention, in which the reflection layer 1 in contrast to the security element from Fig. 1 consists of a further multilayer structure comprising two semitransparent mirror layers 4 and 6 and at least one dielectric layer 5 arranged between the two mirror layers.
  • the two semitransparent mirror layers 4 and 6 preferably each consist of a thin layer of aluminum and the dielectric layer 5 of SiO 2 .
  • Fig. 3 shows the security element according to the invention Fig. 1 , which is fastened with a lacquer layer 15 on a support 16.
  • the lacquer layer 15 here preferably consists of a UV lacquer, the support 16 preferably made of a plastic film.
  • the security element is attached to the reflective layer 1 on the lacquer layer 15 on the support 16 and according to Fig. 3b with the partially permeable layer 3.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
  • Optical Filters (AREA)
  • Laminated Bodies (AREA)

Claims (10)

  1. Elément de sécurité pour papiers de sécurité, documents de valeur ou analogues, qui se compose d'une structure multicouche susceptible d'interférence, dans lequel la structure multicouche susceptible d'interférence présente une couche de réflexion (1), une couche diélectrique (2) et une couche partiellement transparente (3), dans lequel la couche diélectrique (2) est disposée entre la couche de réflexion (1) et la couche partiellement transparente (3), caractérisé en ce que la couche de réflexion (1) se compose d'une couche de couleur, qui contient des particules métalliques en forme de plaquettes, dont la plus grande longueur de côté vaut 15 nm à 1000 nm et dont l'épaisseur vaut 2 nm à 100 nm, de telle manière que la couche de couleur présente en lumière réfléchie une tonalité métallique et en lumière transmise une tonalité colorée.
  2. Elément de sécurité selon la revendication 1, caractérisé en ce que les particules métalliques en forme de plaquettes présentent une plus grande longueur de côté de préférence de 15 nm à 600 nm et de préférence encore de 20 nm à 500 nm et une épaisseur de préférence de 2 nm à 40 nm et de préférence encore de 4 nm à 30 nm.
  3. Elément de sécurité pour papiers de sécurité, documents de valeur ou analogues, qui se compose d'une structure multicouche susceptible d'interférence, dans lequel la structure multicouche susceptible d'interférence présente une couche de réflexion (1), une couche diélectrique (2) et une couche partiellement transparente (3), dans lequel la couche diélectrique (2) est disposée entre la couche de réflexion (1) et la couche partiellement transparente (3), caractérisé en ce que la couche de réflexion (1) se compose d'une autre structure multicouche, qui présente au moins deux couches réfléchissantes semi-transparentes (4, 6) et au moins une couche diélectrique (5) disposée entre les deux couches réfléchissantes, de telle manière que l'élément de sécurité se compose d'une structure multicouche susceptible d'interférence constituée d'au moins cinq couches disposées l'une au-dessus de l'autre, dans lequel la couche de réflexion (1) présente, lors d'une mesure de la transmission de lumière non polarisée dans le domaine des longueurs d'onde bleues de 420 nm à 490 nm, une résonance avec une demi-largeur de 70 nm à 150 nm, de telle manière que l'autre structure multicouche présente en lumière réfléchie une tonalité métallique et en lumière transmise une tonalité colorée.
  4. Elément de sécurité selon la revendication 3, caractérisé en ce que la résonance est la seule résonance située dans le domaine visible.
  5. Elément de sécurité selon une revendication 3 ou 4, caractérisé en ce que lesdites au moins deux couches réfléchissantes semi-transparentes (4, 6) sont formées d'aluminium ou d'un alliage d'aluminium et la couche d'espacement diélectrique satisfait avec une épaisseur h et un indice de réfraction v la relation 120 nm < h ·v < 190 nm.
  6. Elément de sécurité selon une revendication 3 ou 4, caractérisé en ce que lesdites au moins deux couches réfléchissantes semi-transparentes (4, 6) sont formées d'argent ou d'un alliage d'argent et la couche d'espacement diélectrique satisfait avec une épaisseur h et un indice de réfraction v la relation 120 nm < h ·v < 170 nm ou 340 nm < h ·v < 400 nm.
  7. Elément de sécurité selon au moins une des revendications précédentes, caractérisé en ce qu'au moins une des couches diélectriques (2, 5) se compose d'une couche d'impression transparente ou de dioxyde de silicium.
  8. Elément de sécurité selon au moins une des revendications précédentes, caractérisé en ce que la couche partiellement transparente (3) se compose au moins de chrome et/ou de nickel.
  9. Elément de sécurité en transmission pour des papiers de sécurité, des documents de valeur et analogues, avec un support (16) et un élément de sécurité selon au moins une des revendications 1 à 8 appliqué sur le support (16).
  10. Elément de sécurité en transmission selon la revendication 9, caractérisé en ce qu'une couche de vernis (15), qui se compose de préférence de vernis de gaufrage, est disposée entre l'élément de sécurité et le support (16).
EP16716825.1A 2015-04-28 2016-04-11 Élément de sécurité à structure multicouche Active EP3288770B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015005446.5A DE102015005446A1 (de) 2015-04-28 2015-04-28 Sicherheitselement mit Mehrschichtstruktur
PCT/EP2016/000597 WO2016173696A1 (fr) 2015-04-28 2016-04-11 Élément de sécurité à structure multicouche

Publications (3)

Publication Number Publication Date
EP3288770A1 EP3288770A1 (fr) 2018-03-07
EP3288770B1 true EP3288770B1 (fr) 2019-06-26
EP3288770B2 EP3288770B2 (fr) 2024-08-21

Family

ID=55755558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16716825.1A Active EP3288770B2 (fr) 2015-04-28 2016-04-11 Élément de sécurité à structure multicouche

Country Status (4)

Country Link
EP (1) EP3288770B2 (fr)
CN (1) CN107531082B (fr)
DE (1) DE102015005446A1 (fr)
WO (1) WO2016173696A1 (fr)

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CN110832040A (zh) 2017-05-15 2020-02-21 巴斯夫欧洲公司 制备金属纳米颗粒层的方法及其在装饰或安全元件中的用途
US11274219B2 (en) 2017-07-20 2022-03-15 Basf Se Surface functionalized titanium dioxide nanoparticles
EP3658701A1 (fr) 2017-07-28 2020-06-03 Basf Se Procédé de préparation de couches de nanoparticules métalliques et leur utilisation pour des éléments décoratifs ou de sécurité
CA3116462A1 (fr) 2018-10-25 2020-04-30 Basf Se Compositions comprenant des nanoplaquettes d'argent
CN113302064A (zh) 2019-01-21 2021-08-24 巴斯夫欧洲公司 安全元件
CN113272087B (zh) * 2019-01-29 2024-04-19 巴斯夫欧洲公司 安全元件
CA3135776A1 (fr) 2019-05-06 2020-11-12 Nikolay A GRIGORENKO Compositions comprenant des nanoplaquettes d'argent
US20220389245A1 (en) 2019-09-17 2022-12-08 Basf Se Metal oxide nanoparticles
CN115279518A (zh) 2020-04-23 2022-11-01 巴斯夫欧洲公司 包含片状过渡金属颗粒的组合物
EP4200365A1 (fr) 2020-08-21 2023-06-28 Basf Se Revêtements durcissables aux uv ayant un indice de réfraction élevé
DE102020007728A1 (de) 2020-12-17 2022-06-23 Giesecke+Devrient Currency Technology Gmbh Datenträger mit Verbundsubstrat mit einem in einem Durchsichtsbereich angeordneten Sicherheitselement
CN117203007A (zh) 2021-02-03 2023-12-08 巴斯夫欧洲公司 包含银纳米片的组合物
CN115230277A (zh) * 2021-04-25 2022-10-25 中钞特种防伪科技有限公司 薄膜元件、透明防伪元件、及数据载体
CA3218468A1 (fr) 2021-05-12 2022-11-17 Basf Se Compositions comprenant des particules de metal de transition en forme de plaquettes
EP4423176A1 (fr) 2021-10-26 2024-09-04 Basf Se Procédé pour la production d'éléments d'interférence
EP4234641A1 (fr) 2022-02-25 2023-08-30 Basf Se Compositions comprenant des nanoparticules de dioxyde de titane modifiées et leurs utilisations
CN119731276A (zh) 2022-07-11 2025-03-28 巴斯夫欧洲公司 具有高折射率的可uv固化涂层
WO2024231418A1 (fr) 2023-05-08 2024-11-14 Basf Se Compositions comprenant des nanoplaquettes d'argent

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WO2001003945A1 (fr) 1999-07-08 2001-01-18 Flex Products, Inc. Surfaces de diffraction avec arriere-plans a changement de couleur
WO2001053113A1 (fr) 2000-01-21 2001-07-26 Flex Products, Inc. Dispositifs de securite variables du point de vue optique
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EP3288770B2 (fr) 2024-08-21
CN107531082A (zh) 2018-01-02
EP3288770A1 (fr) 2018-03-07
WO2016173696A1 (fr) 2016-11-03
CN107531082B (zh) 2019-06-25

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