EP2094503A1 - Sicherheitsanordnung mit flüssigkristallschicht - Google Patents
Sicherheitsanordnung mit flüssigkristallschichtInfo
- Publication number
- EP2094503A1 EP2094503A1 EP07819695A EP07819695A EP2094503A1 EP 2094503 A1 EP2094503 A1 EP 2094503A1 EP 07819695 A EP07819695 A EP 07819695A EP 07819695 A EP07819695 A EP 07819695A EP 2094503 A1 EP2094503 A1 EP 2094503A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- linear polarizer
- security
- arrangement according
- security element
- data carrier
- 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
- 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
- B42D25/378—Special inks
- B42D25/391—Special inks absorbing or reflecting polarised light
-
- 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
- B42D25/23—Identity 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
- B42D25/20—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
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/364—Liquid crystals
-
- B42D2033/26—
Definitions
- the invention relates to a security arrangement for security papers, documents of value and the like, which contains a security element with a liquid crystal layer.
- Valuables such as branded goods or value documents, are often provided with security elements for safeguarding purposes, which allow a check on the authenticity of the object of value and at the same time serve as protection against unauthorized reproduction.
- security elements for safeguarding purposes, which allow a check on the authenticity of the object of value and at the same time serve as protection against unauthorized reproduction.
- the special properties of liquid-crystalline materials are exploited for this purpose, and above all the viewing angle-dependent color impression of liquid crystal layers, which is referred to below as the color-shift effect.
- liquid crystal layers are generally not transparent, since they require an absorbent background for a good color impression.
- liquid crystal layers having an absorbent background are visually less appealing to cover a see-through area of a bill or other data carrier.
- the present invention seeks to avoid the disadvantages of the prior art and in particular to provide a safety device of the type mentioned, which can be used with appealing visual appearance over a window area or a through opening of a data carrier.
- a transparent security element which has a first linear polarizer and a layer of a cholesteric liquid-crystalline material arranged above the linear polarizer, and
- a transparent verification element having a second linear polarizer crossed to the first linear polarizer, such that the first and second linear polarizers form a dark background for the cholesteric liquid crystal layer when the transparent security element is placed on the transparent verification element, and
- Linearpolarisatoren contains a motif in the form of patterns, characters or a coding that is visually recognizable after placing the security element on the verification element.
- the motif is formed in the linear polarizer by partial regions of different polarization direction.
- mutually perpendicular polarization directions are preferred, but finer brightness gradations may also be provided.
- the motif may be a rectangular, square or round character or symbol which essentially has the shape of the first and / or second linear polarizer.
- a linear polarizer contains partial regions of different polarization direction, then for the purposes of this description the predominantly polarization direction will be referred to as the polarization direction of the linear polarizer.
- the vast majority of the area is usually occupied by a uniform background, before the picture elements, letters, strings or a coding with a smaller area ratio are arranged. By means of this definition, it is always possible to determine unequivocally whether two linear polarizers are crossed even in the presence of motif regions with different orientations.
- the security element is arranged on a data carrier, while the verification element forms an external verification element for the security element.
- the security element is advantageously arranged in or above a window area or a continuous opening of the data carrier.
- only the first linear polarizer has a motif.
- the security element and the verification element are together on a flexible Disk arranged.
- the security element can be brought by bending or folding the data carrier on the verification element.
- the security element and the verification element are advantageously arranged in or above a window area or a continuous opening of the data carrier.
- the first linear polarizer and / or the second linear polarizer may equally have a motif.
- the first and / or second linear polarizer may be formed by a polarizing film or by a printed polarizing layer. If one of the linear polarizers has a motif, it is advantageously formed by a printed layer, since different polarization ranges can then be generated in a simple manner. If, on the other hand, one of the linear polarizers has no motif, this linear polarizer is advantageously present as the polarization film. Such films can be obtained in that optically isotropic films become visually anisotropic by stretching and thus have the desired property of a polarizing film. Various possibilities for producing a polarizing film are known to the person skilled in the art and are therefore not further elaborated.
- the first linear polarizer and the cholesteric liquid crystal layer are preferably present on an optically substantially isotropic carrier film, for example on a film consisting of cycloolefin copolymers or a combination of differently oriented plastic films.
- the cholesteric liquid crystal layer may be printed or laminated on the first linear polarizer.
- more Auxiliary layers such as primer layers, adhesion promoter layers, Kaschierlack Anlagenen, protective lacquer layers and the like may be provided.
- the invention further comprises a flexible data carrier, in particular a value document, such as a banknote, identity card or the like, which is equipped with a security arrangement of the type described.
- a flexible data carrier in particular a value document, such as a banknote, identity card or the like, which is equipped with a security arrangement of the type described.
- the security element and the verification element are geometrically arranged on the disk so that they can be brought by bending or folding the disk on top of each other.
- the security element and the verification element of the security arrangement are expediently arranged in or above a window area or a through opening of the data carrier.
- the through opening of the data carrier can be easily after the preparation of the data carrier substrate, for. B. by punching or cutting, especially laser beam cutting produced.
- the continuous opening can also during the manufacture of the substrate of the disk, so z.
- WO 03/054297 A2 the disclosure of WO 03/054297 A2 is included in the present application.
- the through opening formed according to YJO 03/054297 A2 during the production of the substrate of the data carrier has no sharp boundary edge in the edge region, which constitutes an additional security element of the data carrier.
- FIG. 1 is a schematic representation of a banknote with a security arrangement according to the invention
- FIG. 1 the banknote of FIG. 1 in the folded state
- FIG. 3 shows in (a) a cross-sectional view of the security element of FIG. 1 alone and in (b) the associated visual appearance for a viewer,
- FIG. 4 shows in (a) a cross-section through the verification element with an applied security element and in (b) the associated visual appearance for a viewer
- FIG. 6 shows a banknote with a security arrangement according to a further exemplary embodiment of the invention in unfolded state
- FIG. 8 shows a cross section through the security arrangement of FIG. 6 with a folded banknote.
- FIG. 1 shows a schematic representation of a banknote 10 that is provided with an invented
- the security arrangement according to the invention is equipped.
- the security arrangement comprises a transparent security element 12 and a likewise transparent verification element 14, wherein both elements 12, 14 are arranged over window areas or through openings 16, 18 of the banknote 10.
- the security element 12 contains two visual features which are not easily recognizable to the naked eye, namely a liquid crystal layer with a color shift effect and a hidden image motif, in the exemplary embodiment the crest motif indicated in dashed lines in FIG. 1.
- a liquid crystal layer with a color shift effect and a hidden image motif in the exemplary embodiment the crest motif indicated in dashed lines in FIG. 1.
- the region of the security element 12 which is arranged not on the continuous opening 16 but on the banknote substrate should be arranged on the brightest possible background of the banknote substrate. If the banknote forms a dark background for the liquid-crystal layer in this area, the liquid-crystal layer appears there rich in contrast against a dark background, which the viewer may find disturbing.
- the security element 12 contains an optically substantially isotropic carrier foil 30 onto which a first linear polarizer 32 and a layer 34 of a cholesteric liquid-crystalline material are applied.
- an optically isotropic carrier film 30 for example, cycloolefin copolymers or a combination of differently stretched plastic films are suitable.
- the linear polarizer 32 is formed by a printed polarization layer which has a first polarization direction in a background region 36 occupying the predominant surface portion and a second polarization direction perpendicular to the first polarization direction in a smaller motif region 38.
- the motif area 38 is given by the interior of the coat of arms motif 20 of FIGS. 1 and 3 (b) or 4 (b). Since the human eye is not sensitive to the polarization direction of the light, the linear polarizer 32 and thus also the entire security element 12 appear to the naked eye as a structureless surface.
- the color-shift effect of the cholesteric liquid-crystal layer 34 is also less conspicuous or even not recognizable when the transparent security element 12 is viewed without aids due to the large amount of disturbing ambient light.
- the security element 12 appears to the viewer as a total structureless / gray area, the brightness of which is essentially determined by the light transmittance of the linear polarizer 32.
- the verification element 14 includes a second linear polarizer 40 whose polarization direction is tuned to the first linear polarizer 32 such that the background region 36 of the linear polarizer 32 and the linear polarizer 40 form crossed polarizers around its centerline 24 after folding the banknote 10.
- the polarization direction of the first linear polarizer 32 in FIG. 1 can be perpendicular, that of the second linear polarizer 40 can be horizontal.
- the polarization directions of both polarizers include a 45 ° angle with the horizontal, since the polarization direction of the second linear polarizer 40 is mirrored around its center line 24 when folding the note, and the two polarizers after folding thus crossed.
- the linear polarizer 32 and the linear polarizer 40 form crossed polarizers, which together are virtually opaque and thus produce a dark, absorbing background for the cholesteric liquid crystal layer 34.
- the liquid crystal layer 34 therefore appears in the folded state of the banknote with a clearly visible and striking color-shift effect against a black background.
- the polarization directions of the linear polarizer 32 and of the linear polarizer 40 in the motif region 38 are parallel; the light transmitted by the second linear polarizer 40 therefore also passes through the motif region 38 of the first linear polarizer 32 without significant weakening.
- the motif region 38 therefore appears bright to the viewer and due to the high level of stray light with virtually no color effect.
- the liquid crystal layer 34 comes to rest between the two linear polarizers 32, 40. Due to the phase-shifting effect of the liquid-crystal layer, in spite of crossed linear polarizers, complete extinction of the transmitted light does not result. Rather, observed in two areas 36, 38 in the transmitted light a color shift effect, which varies both with the viewing angle, and with the relative angle of the two linear polarizers.
- FIGS. 3 (a) and 4 (a) do not contain the auxiliary layers typically required in practice, such as primer layers, adhesion promoter layers, laminating lacquer layers, protective lacquer layers and the like. Depending on the materials used and the intended application, the skilled person will suitably supplement these according to his specialist knowledge.
- the linear polarizer 40 of the verification element 14 may be formed by a polarization foil or else by a printed polarization layer.
- an external linear polarizer 50 can also be used for checking the authenticity, as shown in FIG. 5.
- the changes in the visual appearance when the banknote 10 is placed on the external linear polarization Tor 50 correspond to the changes described in connection with Figures 3 and 4 when folding the banknote.
- FIGS. 6 to 8 A further exemplary embodiment of the invention is shown in FIGS. 6 to 8, FIG. 6 a banknote 60 with a security arrangement according to the invention in unfolded state, FIG. 7 the banknote in the folded state and FIG. 8 a cross section through the security arrangement in the folded state of FIG Banknote 60 shows.
- the banknote 60 contains a security arrangement of a transparent security element 62 and a transparent verification element 64, both of which are arranged over window areas or through openings of the banknote 60.
- the security element 62 has a first linear polarizer 82 and a layer 84 of a cholesteric liquid-crystalline material.
- the security element 62 may contain a carrier film on one or both sides, which, however, does not impair the optical effects and should therefore be largely optically isotropic. It is also conceivable, of course, that the carrier film is stretched and thus at the same time acts as a linear polarizer. In such a case, the layer 84 is then placed on the polarizing film, which is not shown in detail in the figures.
- the verification element 64 now contains a second linear polarizer 90, which has a first polarization direction in a background region 92 occupying the predominant surface portion and a second polarization direction perpendicular to the first polarization direction in a smaller motif region 94.
- First and second polarization directions are matched to the orientation of the first linear polarizer 82 such that the background region 92 of the linear polarizer 90 and the linear polarizer 82 form crossed polarizers after folding the banknote 60 about its center line 74.
- the motif area 94 is given in the exemplary embodiment through the interior of the coat of arms motif 70 shown in FIGS. 6 and 7. Since the human eye is not sensitive to the polarization direction of the light, the linear polarizer 90, and hence the entire verification element 64, appears to the naked eye as well as the security element 62 as a structureless surface.
- the banknote 60 when folded, the banknote 60, in which the verification element 64 lies under the security element 62, results in a significantly changed visual appearance.
- the linear polarizer 82 and the background region 92 of the linear polarizer 90 form crossed polarizers in this state, so that a dark, absorbing background for the cholesteric liquid crystal layer 84 is formed there.
- the liquid crystal layer 84 therefore shows a clearly visible and noticeable color shift effect against a black background in the folded state of the banknote 60.
- the polarization directions of the first and second linear polarizers are parallel and let the incident light, therefore, without substantial weakening.
- the motif area 94 appears bright to the viewer and virtually no color effect due to the passing stray light.
Landscapes
- Business, Economics & Management (AREA)
- Accounting & Taxation (AREA)
- Finance (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Laminated Bodies (AREA)
- Pens And Brushes (AREA)
- Credit Cards Or The Like (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006054651A DE102006054651A1 (de) | 2006-11-17 | 2006-11-17 | Sicherheitsanordnung mit Flüssigkristallschicht |
| PCT/EP2007/009686 WO2008058670A1 (de) | 2006-11-17 | 2007-11-08 | Sicherheitsanordnung mit flüssigkristallschicht |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2094503A1 true EP2094503A1 (de) | 2009-09-02 |
| EP2094503B1 EP2094503B1 (de) | 2011-02-23 |
Family
ID=39047640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07819695A Not-in-force EP2094503B1 (de) | 2006-11-17 | 2007-11-08 | Sicherheitsanordnung mit flüssigkristallschicht |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2094503B1 (de) |
| AT (1) | ATE499218T1 (de) |
| DE (2) | DE102006054651A1 (de) |
| WO (1) | WO2008058670A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2411232B1 (de) | 2009-03-23 | 2018-05-02 | Fedrigoni S.p.A. | Fälschungssicheres dokument, wie beispielsweise banknote, pass, personalausweis, und herstellungsverfahren desselben |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2337010B8 (es) | 2009-12-01 | 2014-10-24 | Universidad Politécnica de Madrid | Procedimiento y dispositivo de seguridad documental por generacion de imagenes multiples |
| DE102011084819B4 (de) | 2011-10-19 | 2018-08-02 | Bundesdruckerei Gmbh | Verfahren zur Verifikation eines Sicherheitsdokuments mit einem Muster unter Verwendung einer Anzeigevorrichtung |
| DE102011084820B4 (de) * | 2011-10-19 | 2024-11-14 | Bundesdruckerei Gmbh | Verfahren zur Verifikation eines Sicherheitsdokuments unter Verwendung einer Anzeigevorrichtung |
| DE102011084818A1 (de) * | 2011-10-19 | 2013-04-25 | Bundesdruckerei Gmbh | Verfahren zur Verifikation eines Sicherheitsdokuments mit einer Sichtbarriere unter Verwendung einer Anzeigevorrichtung |
| KR200495231Y1 (ko) * | 2020-06-18 | 2022-04-08 | 엔비에스티(주) | 뷰어 일체형 위변조 방지수단 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1163765C (zh) * | 1997-05-09 | 2004-08-25 | 罗利克有限公司 | 光学元件和包含它的防伪或防拷贝元器件 |
| EP1120737A1 (de) * | 2000-01-27 | 2001-08-01 | Rolic AG | Optische Fälschungssicherheit |
| DE10331798B4 (de) * | 2003-07-14 | 2012-06-21 | Giesecke & Devrient Gmbh | Sicherheitselement, Wertgegenstand, Transfermaterial und Herstellungsverfahren |
| DE10343547A1 (de) * | 2003-09-19 | 2005-04-14 | Giesecke & Devrient Gmbh | Sicherheitselement |
| DE102004018702B4 (de) * | 2004-04-17 | 2006-05-24 | Leonhard Kurz Gmbh & Co. Kg | Folie mit Polymerschicht |
-
2006
- 2006-11-17 DE DE102006054651A patent/DE102006054651A1/de not_active Withdrawn
-
2007
- 2007-11-08 DE DE502007006563T patent/DE502007006563D1/de active Active
- 2007-11-08 EP EP07819695A patent/EP2094503B1/de not_active Not-in-force
- 2007-11-08 WO PCT/EP2007/009686 patent/WO2008058670A1/de not_active Ceased
- 2007-11-08 AT AT07819695T patent/ATE499218T1/de active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008058670A1 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2411232B1 (de) | 2009-03-23 | 2018-05-02 | Fedrigoni S.p.A. | Fälschungssicheres dokument, wie beispielsweise banknote, pass, personalausweis, und herstellungsverfahren desselben |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102006054651A1 (de) | 2008-05-21 |
| ATE499218T1 (de) | 2011-03-15 |
| EP2094503B1 (de) | 2011-02-23 |
| DE502007006563D1 (de) | 2011-04-07 |
| WO2008058670A1 (de) | 2008-05-22 |
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