EP3212430A1 - Sicherheitselement mit farbkippendem dünnschichtelement - Google Patents
Sicherheitselement mit farbkippendem dünnschichtelementInfo
- Publication number
- EP3212430A1 EP3212430A1 EP15787472.8A EP15787472A EP3212430A1 EP 3212430 A1 EP3212430 A1 EP 3212430A1 EP 15787472 A EP15787472 A EP 15787472A EP 3212430 A1 EP3212430 A1 EP 3212430A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- dielectric
- color
- sub
- partial
- 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
Links
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
-
- 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
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
Definitions
- the invention relates to a security element for securing articles of value with a support and a thin-film element arranged on the support, which has a reflection layer arranged above the support, a dielectric spacer layer arranged above the reflection layer and an absorber layer arranged above the dielectric spacer layer.
- 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 securities 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 which 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 color flip 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 way- The difference of the light reflected at the different layers depends on the one hand on the optical thickness of a dielectric spacer layer, which determines the distance between a semi-transparent absorber layer and a reflection layer, and on the other hand varies with the respective viewing angle. Since the path difference is on the order of the wavelength of the visible light, the result is an angle-dependent color impression for the viewer due to the extinction and amplification of certain wavelengths.
- a multiplicity of different color-shift effects can be designed
- the object of the invention is to provide a security element of the type mentioned above with high security against forgery and an attractive visual appearance.
- a security element according to paragraph 1 or 2 characterized in that the security element in the regions of the at least one recess in the reflection layer is semitransparent metallic.
- a security element according to at least one of the paragraphs 1 to 3, characterized in that in the recessed part rich of the reflection layer and the first dielectric sublayer is recessed.
- a security element according to at least one of paragraphs 1 to 4, characterized in that the reflection layer is formed by an opaque or semi-transparent metal layer, preferably by an opaque or semi-transparent aluminum layer.
- a security element according to at least one of paragraphs 1 to 6, characterized in that between the carrier and the reflection layer of the thin-film element an embossing lacquer layer is arranged with an embossed relief structure, wherein the relief structure in particular a diffractive structure, such as a hologram, represents a holographic grating image or a hologram-like diffraction structure, an achromatic structure, such as a matte structure, a micromirror array, a blazed grating with a saw-toothed groove profile, or a Fresnel lens array.
- a diffractive structure such as a hologram
- an achromatic structure such as a matte structure, a micromirror array, a blazed grating with a saw-toothed groove profile, or a Fresnel lens array.
- a security element according to at least one of paragraphs 1 to 7, characterized in that the security element is a security thread, a tear thread, a security tape, a security strip, a patch or a label for application to a security paper, document of value or the like.
- Washing color is washed off after applying the first dielectric sublayer together with this by a solvent.
- the thin-film element has two partial areas with different color-shift effect and one partial area without color-shift effect / where the partial areas each form patterns, characters or an encoding that the partial area without color-shift effect by at least one recess in the Reflection layer is formed in the form of patterns, characters or a coding, that the dielectric spacer layer in a first of the two color-shifting subregions consists of superimposed first and second dielectric sub-layers and generates a portion having a first color-shift effect, and in that the dielectric spacer layer in a second the two color-shifting partial regions consists only of the second dielectric partial layer and produces a partial region with a second, different color-shift effect.
- the second partial layer of the dielectric spacer layer is present in both color-shifting partial regions, while the first partial layer is present only in the first of the two color-shifting partial regions.
- the layer thickness of the first and second sub-layers is in each case advantageously constant, so that the different thickness of the dielectric spacer layer results only from the presence or non-existence of the first sub-layer.
- the thin-film element need not be present directly on the carrier, but one or more intermediate layers may be present between the carrier and the thin-film element, for example the embossing lacquer layer mentioned below.
- the first and second dielectric sublayers consist of the same dielectric material, in particular of SiC 2 or Al 2 O 3.
- the security element is preferably semitransparent in a metallic manner.
- the first dielectric sub-layer is also particularly advantageously recessed in the recessed areas of the reflection layer.
- the reflection layer of the thin-film element is preferably formed by an opaque or a semi-transparent metal layer, preferably by an opaque or a semitransparent aluminum layer.
- an opaque or a semi-transparent metal layer preferably by an opaque or a semitransparent aluminum layer.
- other metals such as silver, nickel, copper, iron, chromium, gold or other highly reflective materials come into consideration.
- the two partial regions with different color-shift effect are preferably formed complementary to one another, that is to say that one of the partial regions represents the pattern, character or coding positively, ie by its shape itself, while the other partial region represents the patterns, characters or coding negative, ie by recesses in represents his form.
- the subarea without color-shift effect and the subarea with different color-shift effect can be complementary to one another or to each other. represent detailed information and thereby closely interlock the three subareas for a viewer.
- an embossing lacquer layer with an embossed relief structure is arranged between the support and the reflection layer of the thin-film element.
- the relief structure may in particular represent a diffractive structure, such as a hologram, a holographic grating image or a hologram-like diffraction structure, or else an achromatic structure, such as a matt structure, a micromirror arrangement, a blazed grating with a sawtooth-like furrow 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, document of value or the like.
- the invention also includes a method for producing a security element of the type described above, in which a color-shifting thin-film element is applied to a support, optionally via one or more intermediate layers, by arranging a reflection layer over the support, a dielectric spacer layer being arranged over the reflection layer and an absorber layer is arranged above the dielectric spacer layer, the thin-film element having two partial areas with different color-shift effect and a partial area without color-shift effect is produced.
- the dielectric spacer layer by applying a first and second dielectric sub-layer is generated successively, the dielectric spacer layer is formed in a first of the two fbilting portions by the stacked first and second dielectric sub-layers and generates a portion having a first color shift effect, and the dielectric spacer layer in a second of the two fbilting portions only from second dielectric sub-layer is formed and generates a partial area with a second, different color shift effect.
- a soluble washing ink in the form of the desired first recesses is printed on the carrier or on an intermediate layer applied to the carrier to produce the at least one recess in the reflection layer.
- the wash ink is washed off after application of the reflective layer or after the application of the reflective layer and the first dielectric sublayer together with these by a solvent.
- a soluble wash ink in the form of the desired second color-shifting subregion is printed onto the reflective layer. The wash ink is washed off after application of the first dielectric sublayer together with this by a solvent.
- a particularly simple production results when the at least one recess in the reflection layer and the recesses in the first dielectric sublayer are produced in a common washing step.
- a full-surface second dielectric sub-layer and a full-surface absorber layer are advantageously applied. Since the first partial layer is present only in regions after the production of the recesses, the entire partial application of the second partial layer results in the desired partial regions with different thicknesses of the dielectric spacer layer.
- recesses are produced in the first dielectric sublayer.
- the wash ink is washed off after application of the second dielectric sublayer together with this by a solvent.
- the recesses are not in the first place th dielectric sublayer, but in the second dielectric sublayer.
- the invention further includes a data carrier with a security element of the type described above.
- the data carrier may 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 deed, a voucher, a check, a high-quality entrance ticket, but also an identification card, such as a credit card, a bank card, a cash card, an authorization card, an identity card or a pass personalization page.
- FIG. 1 shows a schematic representation of a banknote with a security element according to the invention in the form of a security thread
- Fig. 2 is a plan view of a portion of the security thread of
- FIG. 3 shows a cross section through the security thread of Fig. 2 along the line III-III
- Fig. 4 is a cross section as in Fig. 3 for a security thread according to another embodiment of the invention.
- 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 security thread 12.
- a security thread 12 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 with all types of security elements, such as labels on goods and packaging or in the security of documents, ID cards, passports, credit cards, health cards and like.
- security threads for example, broad security strips or transfer elements are also considered.
- FIGS. 2 and 3 show a plan view of a portion of the security thread 12
- Fig. 3 shows 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 thin-film element 30 is arranged, which, viewed from the carrier, comprises in this order a reflection layer 32, a dielectric spacer layer 34 arranged above the reflection layer and a semitransparent absorber layer 36 arranged above the dielectric spacer layer.
- the peculiarity of the security thread 12 consists in particular in that the thin-film element 20 has two partial regions 22, 24 with different color-shift effect and a partial region 26 without color-shift effect, wherein the partial regions 22, 24, 26 each form patterns, characters or a coding.
- the mutually complementary color-shifting partial regions 22, 24 form the numerical sequence "200", which represents the denomination of the banknote 10
- the partial region 26 without color-shift effect forms the letter sequence "text", which stands for any letter or character string.
- the different layer thicknesses in the partial regions 22, 24 also result in different color-shift effects.
- the second partial layer 42 extends over both color-tilting partial regions 22, 24, so that the difference in the layer thickness of the total layer 34 results only from the first partial layer 40 additionally present in the partial regions 22. This can also be expressed in such a way that the first partial layer 40 has recesses 46 in the partial regions 24, while the second partial layer 42 extends over both color-tilting partial regions 22, 24.
- the color impression of the thin-film element 30 can change, for example, in the partial area 22 with the dielectric spacer layer 34 consisting of two partial layers 40, 42 from the color green when viewed perpendicularly to the color magenta at oblique viewing, while the color impression of the thin-film element in the partial area 24 with only from the sub-layer 42 existing dielectric spacer layer 34 of the color magenta when viewed perpendicular to the color gold changes when viewed obliquely.
- the two color-shifting partial regions 22, 24 are complementary to one another, since the partial region 24 itself is formed in the form of the numerical sequence "200", while the shape of the partial region 22 has recesses in the form of the numerical sequence "200".
- the reflection layer 32 is formed by an opaque aluminum layer
- the two dielectric sub-layers 40, 42 are formed by SiC layers
- the semitransparent absorber layer 36 by a chromium layer.
- the PET film 20 is first coated with a wash ink in the form of a print layer. Desired portion 26 printed without color shift effect and the printed with wash film over the entire surface with an aluminum layer 32 vapor-deposited. A printing layer in the desired shape of the color-tipping partial region 24 is then printed on the aluminum layer with a further washing ink and the film again printed with wash ink is coated with a SiO 2 spacer layer, which later forms the first partial layer 40 of the dielectric spacer layer 34.
- a demetallization step is then carried out in which the printed wash ink areas are washed off together with the respectively overlying layer areas of the first partial layer (areas 22) or the reflection layer and the first partial layer (area 24), thereby producing the desired recesses 44, 46 become.
- the security thread 12 is coated over its entire area with a further S1O2 spacer layer, which forms the second partial layer 42 of the dielectric spacer layer 34.
- the layer sequence thus generated is still with a
- Chromium absorber layer 36 vapor-deposited.
- the directly superposed SiCh partial layers 40, 42 together form the spacer layer 34 of the thin-film element 30, which produces different color-shift effects because of their locally different thickness.
- FIG. 4 shows, as a further exemplary embodiment of the invention, a schematic representation of a color-shift hologram in which the above-mentioned visual appearances are combined with an embossed hologram.
- the security thread 50 of FIG. 4 has the same basic structure as the security thread 12 of FIGS. 2 and 3 except for the embossed lacquer layer 52.
- the security thread 50 contains a carrier 20 in the form of a transparent plastic film onto which a UV lacquer layer 52 was applied after its application with a relief 54 in the form of the desired hologram embossed and hardened.
- a thin-film element 60 Arranged on the embossed and cured UV lacquer layer 52 is a thin-film element 60 which, viewed from the support, comprises an aluminum reflection layer 32, an Al 2 O 3 spacer layer 62 arranged above the reflection layer and a semitransparent chromium layer arranged above the spacer layer.
- Absorber layer 36 has.
- the thin-film element 60 has two partial regions 22, 24 with a different color-shift effect and a partial region 26 without a color-shift effect, wherein the partial regions 22, 24, 26 each form patterns, characters or an encoding.
- the partial region 26 without color-shift effect is formed by recesses 44 in the reflection layer 32 and a first sub-layer 40 of the dielectric spacer layer 62.
- the dielectric spacer layer 62 consists of a first color-tilting sub-region 22 of superimposed first and second dielectric sub-layers 40, 42 and produces a thin-film region having a first color-shift effect.
- the dielectric spacer layer 62 consists only of the second dielectric sub-layer 42 and produces a thin-film region with a second, different color-shift effect.
- the hologram formed by the relief 54 can be seen in all three subregions 22, 24, 26 of the thin-film element 60, but with a different visual appearance: In the fb rocking subregions 22 and 24, the hologram is superimposed on the respective color shift effect of the subregion.
- the reflection layer 32 is recessed, but there generates the
- Chromium layer 36 has a sufficient refractive index difference to the sub-layer 42 and the lacquer layer 52, respectively, to make the hologram visible, albeit with reduced contrast and no superimposed color-shift effect.
- the representation of the layers of FIG. 4 is greatly simplified in the simpler drawing and for the illustration of the recessed areas 44, 46.
- the second sub-layer 42 and the absorber layer 36 will also be in contact with the underlying layers during vapor deposition in the recessed areas 44, 46, so that the relief 54 of the enamel layer 52 will also be there in the second sub-layer 42 and the absorber layer 36 continues.
- the recesses 46 are contained in the first dielectric sublayer 40.
- the recesses 46 may not be contained in the first dielectric sublayer 40, but in the second dielectric sublayer 42.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Finance (AREA)
- Credit Cards Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014016028.9A DE102014016028A1 (de) | 2014-10-29 | 2014-10-29 | Sicherheitselement mit farbkippendem Dünnschichtelement |
| PCT/EP2015/002143 WO2016066264A1 (de) | 2014-10-29 | 2015-10-28 | Sicherheitselement mit farbkippendem dünnschichtelement |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP3212430A1 true EP3212430A1 (de) | 2017-09-06 |
| EP3212430B1 EP3212430B1 (de) | 2018-10-24 |
| EP3212430B2 EP3212430B2 (de) | 2021-12-01 |
Family
ID=54364253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15787472.8A Active EP3212430B2 (de) | 2014-10-29 | 2015-10-28 | Sicherheitselement mit farbkippendem dünnschichtelement |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3212430B2 (de) |
| DE (1) | DE102014016028A1 (de) |
| WO (1) | WO2016066264A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT517320B1 (de) | 2015-05-29 | 2020-04-15 | Hueck Folien Gmbh | Sicherheitselement mit Farbkippeffekt |
| WO2019012550A1 (en) * | 2017-07-10 | 2019-01-17 | Raj Prehar | FILM FOR SECURITY APPLICATIONS |
| DE102022002765A1 (de) * | 2022-07-29 | 2024-02-01 | Giesecke+Devrient Currency Technology Gmbh | Sicherheitselement und mit dem Sicherheitselement ausgestattetes Wertdokument |
| DE102023125659A1 (de) | 2023-09-21 | 2025-03-27 | Giesecke+Devrient Currency Technology Gmbh | Optisch variables Sicherheitselement mit farbkippendem Interferenzschichtelement, Wertgegenstand und Herstellungsverfahren |
| DE102023128009A1 (de) * | 2023-10-13 | 2025-04-17 | Leonhard Kurz Stiftung & Co. Kg | Verfahren zur Herstellung eines Mehrschichtkörpers sowie Mehrschichtkörper |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5877895A (en) | 1995-03-20 | 1999-03-02 | Catalina Coatings, Inc. | Multicolor interference coating |
| DE10232245B4 (de) | 2002-07-17 | 2008-06-12 | Leonhard Kurz Gmbh & Co. Kg | Optisch variables Element mit variierender Distanzschicht-Dicke |
| DE102007061827A1 (de) | 2007-12-20 | 2009-06-25 | Giesecke & Devrient Gmbh | Sicherheitselement und Verfahren zu seiner Herstellung |
| DE102008032224A1 (de) | 2008-07-09 | 2010-01-14 | Giesecke & Devrient Gmbh | Sicherheitselement |
| DE102011119598A1 (de) * | 2011-11-29 | 2013-05-29 | Ovd Kinegram Ag | Optisch variables Element |
-
2014
- 2014-10-29 DE DE102014016028.9A patent/DE102014016028A1/de not_active Withdrawn
-
2015
- 2015-10-28 EP EP15787472.8A patent/EP3212430B2/de active Active
- 2015-10-28 WO PCT/EP2015/002143 patent/WO2016066264A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| DE102014016028A1 (de) | 2016-05-04 |
| EP3212430B1 (de) | 2018-10-24 |
| EP3212430B2 (de) | 2021-12-01 |
| WO2016066264A1 (de) | 2016-05-06 |
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