EP3260302A1 - Élément de sécurité optique variable - Google Patents

Élément de sécurité optique variable Download PDF

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Publication number
EP3260302A1
EP3260302A1 EP17000881.7A EP17000881A EP3260302A1 EP 3260302 A1 EP3260302 A1 EP 3260302A1 EP 17000881 A EP17000881 A EP 17000881A EP 3260302 A1 EP3260302 A1 EP 3260302A1
Authority
EP
European Patent Office
Prior art keywords
layer
security element
shift effect
microstructure
dielectric spacer
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.)
Granted
Application number
EP17000881.7A
Other languages
German (de)
English (en)
Other versions
EP3260302B1 (fr
Inventor
Björn Teufel
Winfried HOFFMÜLLER
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP3260302A1 publication Critical patent/EP3260302A1/fr
Application granted granted Critical
Publication of EP3260302B1 publication Critical patent/EP3260302B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/22—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose for use in combination with accessories specially adapted for information-bearing cards
    • 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers

Definitions

  • the invention relates to an optically variable security element for securing valuables, which shows a different visual appearance when viewing the security element from opposite sides.
  • Data carriers such as valuables or identity documents, or other valuables, such as branded articles, are often provided with security elements for the purpose of security, which permit verification of the authenticity of the data carriers and at the same time serve as protection against unauthorized reproduction.
  • Security elements with viewing-angle-dependent effects play a special role in the authentication of authenticity since they can not be reproduced even with the most modern copiers.
  • the security elements are thereby equipped with optically variable elements that give the viewer a different image impression under different viewing angles and, for example, show a different color or brightness impression and / or another graphic motif depending on the viewing angle.
  • the present invention seeks to provide a security element of the type mentioned above with high security against imitation and attractive visual appearance.
  • the suppression of the color shift effect in the first subregion of the second interference layer element as currently understood is due to the fact that the material of the dielectric layer extends to some extent during printing and the surface of the dielectric thus covers the elevations and depressions of the dielectric layer Microstructure can not or at least not completely follow, so that arise locally different dielectric layer thicknesses. Since the local thickness of the dielectric determines at which wavelengths constructive and destructive interference occurs, the color-shifting layer system of the second interference layer element in the first subregion reflects different colors depending on the local thickness of the dielectric material. When viewed with the naked eye results in over a larger area and thus many different colors averaged, gray or silvery appearing hue.
  • the particular advantage is that the different optically variable effects of the first and second sub-range automatically and without additional measures are matched to each other.
  • the first section advantageously shows a non-colored, metallic and typically silvery appearance.
  • non-ferrous metals or colored precious metals however, other, non-silvery metallic color impressions can be obtained.
  • the reflective layer of the thin-film element can be formed from copper or contain a copper layer, so that a reddish metallic appearance is produced in the first subregion.
  • the printed dielectric layer has a locally irregular layer thickness in the first partial region having the microstructure, preferably with a thickness variation of 10% or more, particularly preferably 20% or more, 40% or more and in particular 60% or more.
  • the thickness variation is on the largest. Layer thickness, so that, for example, a dielectric layer whose thickness varies between 240 nm and 300 nm, a thickness variation has 20%.
  • the first subarea when viewed from the side of the second major surface, preferably has a microscopic rainbow color shift effect that can only be seen under magnification.
  • the microscopic rainbow color shift effect is preferably composed of a plurality of microscopic color dots of different colors, the largest dimension of the microscopic color dots being between 1 and 80 ⁇ m, preferably between 1 and 20 ⁇ m, particularly preferably between 2 and 5 ⁇ m.
  • This microscopic rainbow color shift effect can be used as a mark of authenticity higher level, which can be tested only with special tools, such as a strong magnifying glass or a microscope.
  • At least one of the layers is cut out in the form of characters, patterns or a coding, the recess (s) preferably being present in the first partial region.
  • the recess (s) preferably being present in the first partial region.
  • two - more preferably three - layers, which may in particular follow one another, are recessed.
  • the second absorber layer is recessed in the form of characters, patterns or a coding, the recess (s) preferably being present in the first subregion.
  • the recess preferably being present in the first subregion.
  • the second absorber layer may be recessed together with the printed dielectric spacer layer in the form of characters, patterns or a coding, the recess (s) preferably being present in the first partial area.
  • the recess (s) preferably being present in the first partial area.
  • the reflection layer may be omitted in the form of characters, patterns or a coding.
  • the recess in the reflection layer is transparent, regardless of recesses in further layers. In plan view, therefore, gray appearance negative mark can thus be integrated into the security element (or its shiny metallic first portion). With a suitable choice of the spacing of the two absorber layers, an additional color-shift effect can alternatively be achieved. If the recess in the reflection layer is also present in one of the two (or both) absorber layers, the recess looks light gray from the corresponding side (or white).
  • the microstructure of the first subregion is advantageously formed by a diffractive relief structure, such as a hologram structure, by a micromirror structure, by a microlens structure or by a microcavity structure.
  • the second subregion which has no microstructure, is preferably unembossed and flat.
  • the reflection layer is preferably opaque in order to ensure that the optical effects of the two interference layer elements do not influence one another.
  • the reflection layer can be a single layer, in particular of a metal, such as aluminum, silver, gold or copper.
  • the reflection layer consists of a layer sequence of two or more different reflective layers, for example, a layer sequence of a copper and an aluminum layer. In this way, the visual appearance The opposite sides are also designed differently.
  • the color-shift effect of the first and second partial regions when viewed from the side of the first main surface is preferably identical, even if the structuring of the reflection layer in the first partial region is visible in contrast.
  • the color-shift effect when viewed from the side of the second major surface preferably differs from the color-shift effect when viewed from the side of the first major surface to produce highly different visual impressions on the opposite sides.
  • the security element is advantageously designed as a pendulum security thread, but may for example also be designed as a security thread, label or transfer element and at least partially disposed over a continuous opening or in a window region of a data carrier.
  • the invention also includes a data carrier with a security element of the type described, wherein the security element is preferably embedded in the data carrier so that it is partially visible on opposite sides of the data carrier.
  • the security element is arranged in or above a transparent window area or a through opening of the data carrier.
  • the data carrier may in particular be a value document, such as a banknote, in particular a paper banknote, a polymer banknote or a film composite banknote, a share, a bond, a certificate, a coupon, a check, a high-quality admission ticket, but also an identity card such as a credit card, a bank card, a cash card, an entitlement card, an identity card, or a pass personalization page.
  • the printed dielectric spacer layer is produced by printing a liquid lacquer, for example a nitrocellulose-based solvent lacquer, and subsequently curing the printed lacquer.
  • a liquid lacquer for example a nitrocellulose-based solvent lacquer
  • FIG. 1 shows a schematic representation of a banknote 10, which is provided with a security element according to the invention in the form of a pendulum security thread 12.
  • the pendulum safety thread 12 emerges alternately on window areas 14 on the front side and window areas 16 on the rear side of the banknote 10 and is freely accessible there.
  • the pendulum security thread 12 when viewed from opposite sides of the banknote, respectively has a distinctively different optically variable appearance, so that the observer has the illusion that two different security threads are embedded in the banknote 10 congruently.
  • FIG. 2 (a) 2 schematically shows the pendulum security thread 12 when viewing the front side of the banknote 10.
  • the pendulum security thread 12 emerges in the window regions 14 on the front side and shows a metallic appearance without color shift effect in a first subarea 20 and a color shift effect of magenta in a second subarea 22 vertical view to green with oblique view.
  • the metallic appearance without color shift effect of the first portion 20 and the color shift effect of the second portion 22 are perfectly matched to each other.
  • FIG. 2 (b) shows the pendulum security thread 12 when viewing the back of the banknote 10. Looking at the back of the pendulum security thread 12 emerges in window areas 16 on the paper surface of the back, which are each between two window areas 14 of the front banknote. Visually, the pendulum security thread 12 shows from the banknote back side a completely different appearance, especially without appearing metallic subregions.
  • the visible on the front metallic structures 26 of the first portion 20 are indeed recognizable with their shape from the back, but they do not appear with a constant, silvery metallic color impression, but show with the second portion 22 a common color shift effect of green with vertical supervision to blue at oblique view changes.
  • the metallic appearance of the first portion 20 When changing from the front view to a rear view therefore disappears on the one hand, the metallic appearance of the first portion 20 and on the other hand also changes the color shift effect (green - blue to magenta - green). Also, the appearance on the back by the uniform color shift effect is largely homogeneous, while on the front of a strong contrast between the metallic portion 20 and the color-tilting portion 22 is visible.
  • the pendulum safety thread 12 has the in Fig. 3 schematically shown in cross-section construction.
  • the pendulum security thread 12 contains a transparent carrier film 30, for example a PET film, on which a UV-curing embossing lacquer layer 32 is applied and provided in a first subregion 20 with an embossed microstructure 34.
  • the microstructure 34 is formed, for example, by an arrangement of embossed micromirrors.
  • a second subregion 22 outside the first subregion 20 there is no microstructure, where the embossing lacquer layer is unembossed and even.
  • a first, semitransparent absorber layer 36 for example of chromium, was deposited on the embossing lacquer layer 32 with the embossed microstructure 34, which follows the microstructure 34 due to its small layer thickness and the generation by vapor deposition of the local surface texture.
  • a dielectric spacer layer 38 was likewise applied to this absorber layer 36 by vapor deposition, which likewise follows the local surface texture of the microstructure 34, so that a dielectric spacer layer 38 of uniform thickness is formed in both partial regions 20, 22.
  • an opaque aluminum layer is evaporated, which in turn follows the local surface texture of the microstructure 34.
  • the first absorber layer 36, the vapor deposited dielectric spacer layer 38, and the reflective layer 40 form a first interference layer element 50 viewed from the side of the first absorber layer 36 shows over its entire surface a uniform color shift effect, in the exemplary embodiment about the aforementioned color shift effect between green when viewed vertically and blue at oblique viewing. Due to the different structuring of the reflection layer 40, the first and second subregions 20, 22 can be seen with their shape, but the same color shift effect appears in both subregions 20, 22 due to the uniform thickness of the dielectric spacer layer 38.
  • the side of the reflection layer 40 facing the first absorber layer 36 and the vapor-deposited dielectric spacer layer 38 forms a first main surface 40-1 of the reflection layer 40, the opposite main surface a second main surface 40-2.
  • a further dielectric spacer layer 42 is applied in both sub-regions 20, 22 and in contrast to the spacer layer 38 not by vapor deposition, but by printing a liquid paint and subsequent curing.
  • a second, semi-transparent absorber layer 44 for example, again vapor-deposited from chromium.
  • the second absorber layer 44, the printed dielectric spacer layer 42, and the reflective layer 40 form a second interference layer element 52 which, when viewed from the absorber layer 44 side in the second portion 22, exhibits a color shift effect, for example from magenta when viewed perpendicularly to green when viewed obliquely.
  • the varnish of the spacer layer 42 in liquid form, however, it runs in the first subregion 20 containing the microstructures 34 between the individual structural elements and thereby completely or partially levels the microstructure 34.
  • Solvent based on nitrocellulose base which have a good flow behavior.
  • the printed dielectric spacer layer 42 thus does not have a uniform layer thickness in the first subregion 20, so that no large-area color-shift effect visible to the naked eye can form there. Rather, the color-shift effect is effectively suppressed in the portion 20 by the leveling, and it shows a non-colored, metallic appearance.
  • the dielectric layer 42 is printed over both subareas 20, 22, and the suppression of the color shift effect is precisely in the area of the microstructures 34 of the first subregion 20, a perfect registration between the different optical effects of the two subregions 20 is automatically produced without additional measures. 22.
  • a metallic appearance without color-shift effect thus appears in the first subarea 20, and a color shift effect perfectly matched thereto in the second subarea 22.
  • An inventive security element such as the pendulum security thread 12 of Fig. 1 , may also be provided with negative writing areas, as in Fig. 4 illustrated.
  • negative writing areas approximately the second absorber layer 44 is recessed in a subregion 60, as a result of which these regions become gray when viewed from the side of the second main surface 40-2 Show appearance.
  • a white negative writing may be obtained by a recess of both the second absorber layer 44 and the printed spacer layer 42 in a subregion 62. It is understood that the recesses of the sub-areas 60, 62 instead of negative writing can also represent other negative marks, in particular in the form of patterns, characters or Coderache.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Credit Cards Or The Like (AREA)
EP17000881.7A 2016-06-22 2017-05-23 Élément de sécurité optique variable Active EP3260302B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016007649.6A DE102016007649A1 (de) 2016-06-22 2016-06-22 Optisch variables Sicherheitselement

Publications (2)

Publication Number Publication Date
EP3260302A1 true EP3260302A1 (fr) 2017-12-27
EP3260302B1 EP3260302B1 (fr) 2019-07-10

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Family Applications (1)

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EP17000881.7A Active EP3260302B1 (fr) 2016-06-22 2017-05-23 Élément de sécurité optique variable

Country Status (3)

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EP (1) EP3260302B1 (fr)
CN (1) CN107521251B (fr)
DE (1) DE102016007649A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020088791A1 (fr) * 2018-10-31 2020-05-07 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité et support de données équipé de l'élément de sécurité
CN112572018A (zh) * 2019-09-29 2021-03-30 中钞特种防伪科技有限公司 多层体光学防伪元件及其制作方法
CN111746171B (zh) * 2019-03-29 2021-06-15 中钞特种防伪科技有限公司 光学防伪元件及其制作方法
EP4019271A4 (fr) * 2019-08-19 2023-08-16 Zhongchao Special Security Technology Co., Ltd Élément anti-contrefaçon optique et produit anti-contrefaçon optique
WO2024056131A1 (fr) * 2022-09-15 2024-03-21 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optique avec régions à effet

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11932001B2 (en) 2018-06-15 2024-03-19 Lg Chem, Ltd. Decoration member
CN111683562B (zh) 2018-06-15 2022-11-15 株式会社Lg化学 装饰构件
CN111761962B (zh) * 2018-07-20 2021-07-23 安徽原上草节能环保科技有限公司 安全元件
CN111890817B (zh) * 2019-05-05 2022-03-22 中钞特种防伪科技有限公司 多层镀层光学防伪元件及其制作方法
DE102020000031A1 (de) * 2020-01-03 2021-07-08 Giesecke+Devrient Currency Technology Gmbh Optisch variables Sicherheitselement
CN114654917B (zh) * 2022-03-02 2023-03-24 武汉华工图像技术开发有限公司 一种全息多色光变防伪膜及其制备方法和防伪产品

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2005038136A1 (fr) * 2003-10-17 2005-04-28 Giesecke & Devrient Gmbh Element de securite a effet de derive chromatique
EP1620602A1 (fr) * 2003-04-28 2006-02-01 Giesecke & Devrient GmbH Element de securite plan et son procede de fabrication
DE102014013049A1 (de) * 2014-09-03 2016-03-03 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement

Family Cites Families (7)

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DE10206357A1 (de) * 2002-02-14 2003-08-28 Giesecke & Devrient Gmbh Sicherheitselement und Sicherheitsdokument mit einem solchen Sicherheitselement
DE10222433A1 (de) * 2002-05-22 2003-12-11 Kurz Leonhard Fa Streifenförmiges Sicherheitselement
DE102006015023A1 (de) * 2006-03-31 2007-10-04 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
DE102009036314A1 (de) * 2009-08-06 2011-02-10 Giesecke & Devrient Gmbh Verfahren zur Herstellung eines Sicherheitselements und nach dem Verfahren erhältliches Sicherheitselement
DE102013005839A1 (de) * 2013-04-04 2014-10-09 Giesecke & Devrient Gmbh Sicherheitselement für Wertdokumente
DE102013005937A1 (de) * 2013-04-05 2014-10-09 Giesecke & Devrient Gmbh Verfahren zum Herstellen eines Sicherheitselements mit Negativschrift
DE102013007484A1 (de) * 2013-04-29 2014-10-30 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1620602A1 (fr) * 2003-04-28 2006-02-01 Giesecke & Devrient GmbH Element de securite plan et son procede de fabrication
WO2005038136A1 (fr) * 2003-10-17 2005-04-28 Giesecke & Devrient Gmbh Element de securite a effet de derive chromatique
DE102014013049A1 (de) * 2014-09-03 2016-03-03 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020088791A1 (fr) * 2018-10-31 2020-05-07 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité et support de données équipé de l'élément de sécurité
CN111746171B (zh) * 2019-03-29 2021-06-15 中钞特种防伪科技有限公司 光学防伪元件及其制作方法
EP4019271A4 (fr) * 2019-08-19 2023-08-16 Zhongchao Special Security Technology Co., Ltd Élément anti-contrefaçon optique et produit anti-contrefaçon optique
CN112572018A (zh) * 2019-09-29 2021-03-30 中钞特种防伪科技有限公司 多层体光学防伪元件及其制作方法
WO2024056131A1 (fr) * 2022-09-15 2024-03-21 Giesecke+Devrient Currency Technology Gmbh Élément de sécurité optique avec régions à effet

Also Published As

Publication number Publication date
CN107521251B (zh) 2019-06-25
DE102016007649A1 (de) 2017-12-28
EP3260302B1 (fr) 2019-07-10
CN107521251A (zh) 2017-12-29

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