EP1778500A2 - Element de securite a effet changeant des couleurs par basculement - Google Patents

Element de securite a effet changeant des couleurs par basculement

Info

Publication number
EP1778500A2
EP1778500A2 EP05761767A EP05761767A EP1778500A2 EP 1778500 A2 EP1778500 A2 EP 1778500A2 EP 05761767 A EP05761767 A EP 05761767A EP 05761767 A EP05761767 A EP 05761767A EP 1778500 A2 EP1778500 A2 EP 1778500A2
Authority
EP
European Patent Office
Prior art keywords
film
layer
security
thin
security element
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.)
Withdrawn
Application number
EP05761767A
Other languages
German (de)
English (en)
Inventor
Manfred Heim
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 GmbH
Original Assignee
Giesecke and Devrient 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 GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP1778500A2 publication Critical patent/EP1778500A2/fr
Withdrawn legal-status Critical Current

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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • 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
    • B42D25/23—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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/346—Perforations
    • 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
    • B42D2033/22—
    • B42D2035/24—

Definitions

  • the invention relates to a security element for security papers, value documents and the like having a thin-film element with Farbkipp ⁇ effect, which has a reflection layer, an absorber layer and a zwi ⁇ rule of the reflection layer and the absorber layer arranged Abstands ⁇ layer.
  • the invention also relates to a security paper, a document of value and a method for producing such a security element.
  • Security documents such as banknotes, stocks, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other counterfeit securities, such as passports or other identification documents, are usually provided with various security features to increase the security against counterfeiting.
  • the security features can be embodied, for example, in the form of a security thread embedded in a banknote, an applied security strip or a self-supporting transfer device, such as a patch or a label, which is applied to a value document after its manufacture.
  • Security paper is understood according to the invention as the precursor to the value document, which is not yet ready for use.
  • security features with multilayer thin-film elements, which also show a color change effect.
  • films coated with cholesteric liquid crystals have been used, in which the color impression for the viewer changes with the viewing angle, and changes, for example, from green to blue, from blue to magenta or from magenta to green when the security feature is tilted.
  • the color impression of these liquid-crystal-coated films can still be applied after completion.
  • Position of the film can be influenced by stretching.
  • the color effect is based on interference effects by multiple reflections in the different sub-layers of the thin-film element and is described in detail, for example, in the publication EP 0395410 B1.
  • Such color changes when tilting a security feature are referred to below as color kippeff ect or color shift effect.
  • the thin-film elements contain an ultrathin dielectric layer, which is typically arranged between an absorber layer and a reflection layer.
  • the essential technical challenge here is the production of the dielectric layer which is only a few hundred nanometers thin.
  • the thin dielectric layers are typically produced by a complex vacuum evaporation process.
  • the precision requirements are extremely high, so that such coatings can only be performed at a small number of locations worldwide.
  • the object of the invention is to specify a generic security element which is simpler and less expensive to produce than the prior art.
  • a security paper for the production of security documents, a value document with such a security element and a production method for such a security element are the subject of the independent claims. Further developments of the invention are the subject of the subclaims.
  • the spacer layer is formed by an ultrathin foil having a thickness of less than 1.0 ⁇ m.
  • the ultrathin film preferably has a thickness of about 250 nm to about 750 nm, preferably from about 400 nm to about 600 nm.
  • Such films are already commercially available today and are mainly used as dielectric films for capacitors.
  • the ultrathin film is a stretched polyester film, preferably a monoaxially, sequentially biaxially or simultaneously biaxially oriented polyalkylene terephthalate film.
  • the film may comprise a biaxially oriented polyethylene terephthalate film.
  • PET film PET film.
  • the stretching of the PET films thereby leads to an increase in the strength and heat resistance and to the improvement of further properties of the films, such as dimensional stability.
  • the reflection layer of the thin-film element is formed in advantageous Ausges ⁇ by an opaque metal layer.
  • the security element can also be designed as a semitransparent see-through security element.
  • an opaque reflection layer instead of an absorber layer, a semitransparent metal layer or a transparent reflection layer is used as the reflection layer, whose refractive index is different from that of the ultra-thin layer. thin film is different.
  • a transparent reflection layer virtually all evaporable transparent compounds come into use, in particular also higher-refractive coating materials such as ZrO 2 , ZnS, TiCh or ITO (indium tin oxide) whose refractive index is more than 0.2, preferably even more as 0.5 of the film of the underside separates.
  • the layer thickness of such a transparent reflection layer is preferably in the range of 30 nm to 300 nm, more preferably between about 50 nm and about 60 nm.
  • Metal layers of materials such as chromium, iron, gold, copper, aluminum or titanium, which are preferably applied in a thickness of about 4 nm to about 20 nm, may be used as absorber layers.
  • Compounds such as nickel-chromium-iron, or more rare metals, such as vanadium, palladium or molybdenum, can also be used.
  • Further suitable materials are, for example, nickel, cobalt, tungsten, niobium, aluminum, metal compounds, such as metal fluorides, oxides, sulfides, nitrides, carbides, phosphides, selenides, silicides and compounds thereof, but also carbon, germanium, Cermet, iron oxide and the like.
  • the absorber layer and the reflective layer are preferably applied to the ultrathin film in a vacuum vapor deposition process.
  • a wide variety of vapor deposition methods can be used to coat the film.
  • PVD Physical Vapor Deposition
  • CVD Chemical Vapor Depositi- on
  • the absorber layer and / or the spacer layer has recesses in the form of patterns, characters or codes in which no Farbkippeff ekt is recognizable.
  • the reflective layer can also have recesses in the form of patterns, characters or codes, which appear as transparent or semitransparent areas in the thin-film element.
  • the recesses can be applied, for example, as graphic designs or as positive or negative writing, for example in the form of a serial number or another individualizing identifier, and further increase the security against forgery of the security element.
  • the thin-film element can have a second absorber layer on the side of the reflection layer facing away from the spacer layer and a second spacer layer made of an ultrathin film with an opening between the second absorber layer and the reflection layer Thickness below 1.0 microns have.
  • the statements made above for the first ultrathin film apply accordingly.
  • the first and second spacer layers are formed from films of different thickness, so that different color-shift effects can be recognized by the two sides of the security element.
  • the thin-film element has at least one further layer with an additional security feature, in particular a layer provided with magnetic, electrically conductive, luminescent or optically variable materials.
  • a suitable for machine-readable codings and bestirnmte magnetic Me ⁇ tall slaughter of nickel, iron, cobalt or a suitable alloy so zwi ⁇ tween the reflection layer and a support of the security element ange ⁇ be arranged that it remains invisible to the viewer and the described optical effects are not adversely affected.
  • the thin-film element is advantageously applied to a carrier, for example a transparent carrier film.
  • a carrier for example a transparent carrier film.
  • Transparency and / or color of the carrier are expediently matched to the properties of the thin-layer element and the desired appearance of the security element.
  • a transparent support for see-through security elements or recessed security elements is suitable whose information content should also be visible in transmitted light.
  • the carrier is removed after the application of the security element to its destination, for example via suitable release layers.
  • the thin-film element can be stretched in regions when applied to the carrier so as to compensate for thickness variations of the unstretched film.
  • the compensation can be done using a control loop, in which the thickness or the color impression of the film during the application of the film is detected and the amount of stretching is regulated accordingly.
  • the elongation can also be used specifically for color variation by laminating the film along the direction of application with slowly increasing or decreasing elongation, for example, so that a continuous color transition is produced.
  • the thin-film element is provided with a planar diffraction structure in order to form a color-shift hologram in which the color-shift effect is combined with a holographic effect.
  • the thin-film element is preferably arranged on a support which already has a planar diffraction structure.
  • the carrier can be formed by an embossing lacquer layer provided with a diffraction structure, which forms a component of the finished security element.
  • the diffraction structure of the embossing lacquer layer is vapor-deposited with a reflector and above that the semitransparent
  • Thin-film element with the layer structure semitransparentes metal / ult ⁇ thin film / semitransparent metal are glued.
  • the absorber layer of such a color-shift hologram typically has a transmission between 25% and 75%.
  • An alternative layer structure for a security element provided with diffraction structures is as follows: A support provided with diffraction structures is provided with a semitransparent metal layer, over which an adhesive layer has been applied. Over the adhesive layer is a sorber, then the ultrathin film and then a reflection layertiti ⁇ introduced.
  • Each of the security elements described above can be designed, for example, in the form of a security strip, a security thread, a security band, a label-shaped individual element (patch) or a transfer element for application to a security paper, value document or the like.
  • the security elements can be present in the form of pigments, which are prepared, for example, by grinding the thin-film construction according to the invention. With suitable binders, these pigments can also be further processed into printing inks.
  • the invention also includes a security paper for the production of security documents, such as banknotes, identity cards or the like, which is equipped with a security element described above.
  • the security paper may in particular contain at least one continuous window area or a hole which is covered with the security element.
  • a security element is advantageously used, the reflective layer of which is provided with recesses, or a security element whose color-shift effects are visible from both sides.
  • the invention further includes a value document equipped with a security element described above, for example a banknote.
  • the value document may also include a window area covered by the security element or a hole covered therewith.
  • the described security element, security paper or document of value can also be used to secure goods of any kind.
  • a security element for security papers, documents and the like which contains a thin-film element with a color shift effect, which has a reflection layer, an absorber layer and a spacer layer arranged between the reflection layer and the absorber layer
  • the spacer layer is formed by an ultrathin film having a thickness below 1.0 microns, which is coated on opposite major surfaces with the reflection layer and the absorber layer.
  • the reflective layer and / or the absorber layer are vapor-deposited onto the ultrathin film.
  • the reflection layer can be configured as described above, ie advantageously as an opaque metal layer, as a semi-transparent metal layer, as a transparent reflection layer or as an absorber layer.
  • recesses in the form of patterns, characters or codes are introduced into the thin-film element, preferably into the absorber and / or reflection layer. This can be done in particular in the manner described below using oil.
  • the thin-layer element is expediently applied to a carrier, for example a transparent carrier foil.
  • a carrier for example a transparent carrier foil.
  • the coated ultrathin film can be applied directly to a security paper or a document of value.
  • FIG. 1 is a schematic representation of a banknote with embedded color shift security thread and glued-on color shift transfer element, each according to an embodiment of the invention
  • FIG. 3 shows a section through the color shift security thread of FIG. 1 along the line IH-III, FIG.
  • FIG. 6 shows a semitransparent see-through security element according to a further exemplary embodiment of the invention
  • Fig. 7 is a double-sided thin-film element after another
  • Fig. 8 is a color shift hologram according to an embodiment of the invention in cross section
  • FIG. 9 shows a further color shift hologram according to an embodiment of the invention in cross section.
  • FIG. 1 shows a schematic representation of a banknote 10 which is provided with a embedded color-shift security thread 12 and a glued-on color shift transfer element 16.
  • the security thread 12 protrudes at certain window areas 14 on the surface of the banknote 10, while it is embedded in the intervening areas inside the banknote 10.
  • the window areas 14 of the security thread 12 shows a Farbkippeff effect, which gives the viewer a changing color with the viewing angle.
  • the banknote 10 has a continuous, punched opening 18 which is completely covered on the front side of the banknote by the color shift transfer element 16.
  • the opening could already have been incorporated in the papermaking process.
  • the color-shift transfer element 16 is designed in the manner described below as a transparent transparency-proof element, which shows a color-shift effect in the through-view region 18 from both sides of the banknote.
  • the security element 20 of FIG. 2 contains a thin-film element 22 with Farbkippeff ekt, which consists of a coated on both sides of 0.5 micron thick BOPET (biaxially oriented polyethylene terephthalate) film 24.
  • the ultrathin BOPET film 24 is vapor-deposited on one side with an opaque reflective layer 26 of aluminum, on the other side with a semitransparent absorber layer 28 of chromium.
  • multiple interference in the thin-film element 22 results in a viewing angle-dependent color impression.
  • the security element 20 appears in magenta when viewed perpendicularly, while it appears green under acute-angle viewing 32.
  • the thin-film element 22 of FIG. 2 may be applied directly to a value document, such as a banknote.
  • the coated, ultrathin films are applied to a carrier, for example a transparent carrier film, for further processing.
  • 3 shows a cross section through a security thread, such as the window security thread 12 of FIG. 1.
  • the large-area coated BOPET film 24 was first laminated onto a carrier film 34 so that it overlies it via an adhesive layer 36 is connected. Carrier film and thin film element were then cut into narrow strips to obtain a plurality of color-shift security threads. Before cutting, a diffraction structure can additionally be coined in the overall structure. The embossing can take place on the side carrying the thin-film element or else on the side of the carrier film.
  • the security elements according to the invention can be provided with recesses 42 in the form of patterns, characters or codes, as in der ⁇ security element 40 of Figure 4 shown.
  • an endless cover tape is passed over the coating roller simultaneously and synchronously with the film.
  • the masking tape firmly bears on the film 24 and the coating roller with prestressing, so that a sharp transition of metal-coated and uncoated regions to the film 24 can be produced.
  • the film can be printed immediately before the vapor deposition step with metal with a volatile oil at the points where recesses in the metal layer should appear. During the sputtering step with metal, the oil evaporates at the coated areas on the film, so that no metal vapor is deposited there.
  • the recesses can also be produced according to the method as described in the document EP 1 023499 B1. Their disclosure content is also included in the present application.
  • the thin-film element is transparent or semitransparent, so that the viewer in these areas offers a striking contrast to the surrounding color-shift effect.
  • the patterns, characters or codes in transmitted light can light up brightly when the thin-film element 22 is applied to a transparent carrier 34.
  • the transfer element 16 can, for example, be formed like the security element 40 of FIG. 4 and can be provided with recesses, for example in the form of a serial number or value number. In incident light, the color-shift effect of the transfer element 16 then determines the appearance, while in the transmitted light, the omitted serial number or value number of the banknote is conspicuous.
  • FIG. 6 shows a further design according to the invention of the color-shift transfer element 16 in the form of a semi-transparent see-through security element 50, which likewise can be attached over the opening 18 of a banknote 10.
  • the see-through security element 50 contains an ultrathin film 52 laminated on a transparent support film 34, in the exemplary embodiment with a thickness of 0.6 ⁇ m, in which the reflection layer 54 is formed by a semitransparent metal layer. Both the absorber layer 56 and the reflection layer 54 transmit and respectively reflect part of the incident radiation, so that the see-through security element 50 appears semitransparent and shows a color tilting effect on both sides.
  • the see-through security element 50 can of course be provided with recesses of the type described above.
  • the see-through element may additionally have a diffraction structure which was subsequently recorded. The embossing can take place on the side carrying the thin-film element or on the side of the carrier film.
  • FIG. 7 A further exemplary embodiment with a color shift effect visible from both sides is illustrated in FIG. 7.
  • the thin-film element 60 shown in the figure without carrier film has a first absorber layer 62, a first ultrathin film 64, opaque reflection layers 66 and 68, a second ultrathin film 70 and a second absorber layer 72.
  • the thin-film element 60 is formed from two coated foils 74 and 76, whose opaque reflection layers 66, 68 face each other. Viewed from the underside, only the color shift effect of the first coated film 74 is visible, and only the color shift effect of the second coated film 76 is visible from the upper side.
  • the thicknesses of the ultrathin films 64 and 70 can be selected differently from one another, so that different color-tilting effects are produced on the two sides of the security element 60.
  • the first ultrathin film 74 with its absorber layer can be laminated in advance onto a transparent carrier film and the second film 76 then be laminated with its reflection layer over the first film 74.
  • the two ultrathin foils 74 and 76 may each be laminated with the reflective layer ahead on opposite major surfaces of a carrier foil.
  • the carrier film need not be translucent, but instead may be suitably colored, for example, so that its color in part comes out in recesses of the reflection layers 66 and 68.
  • These double-sided thin-film elements are particularly suitable for further processing into pigments.
  • the thin-film elements are ground to the desired pigment size and optionally further processed into printing inks.
  • the security element 80 of the exemplary embodiment shown in FIG. 8 represents a color-shift hologram, in which the thin-film element 82 with color-shift effect is additionally combined with a planar diffraction structure 84.
  • an embossing lacquer layer 88 is applied to a carrier foil 86, into which the diffraction structure 84 is embossed.
  • An opaque metal layer was vapor-deposited over the embossing lacquer layer as a reflection layer 89.
  • the thin-film element 82 which is designed to be transparent, for example, as in FIG. 2, is applied to the reflection layer 89 by means of adhesive 87, so that the diffraction structure 84 can be viewed through the thin-film element 82.
  • the security element 80 displays a holographic effect combined with a color shift effect.
  • the security element 90 of the exemplary embodiment shown in FIG. 9 likewise represents a color-shift hologram, in which the thin-film element 92 with color-shift effect is additionally combined with a flat diffraction structure 94.
  • a diffraction structure 94 was embossed directly into a carrier film 96.
  • a semitransparent metal layer 98 was vapor-deposited.
  • the thin-film element 92 was applied to the semitransparent metal layer by means of an adhesive 97.
  • the thin-film element is composed of the layers of absorber 95, ultra-thin film 93 and opaque metal layer as reflection layer 91. When viewed through the preferably transparent carrier film looks the viewer simultaneously a holographic effect, combined with ei ⁇ nem Farbkippeff ect.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un élément de sécurité pour papiers de sécurité, papiers-valeurs et similaires, comportant un élément à couche mince (22) à effet changeant des couleurs par basculement. Ledit élément comprend une couche de réflexion (26), une couche d'absorption (28) et une couche d'écartement (24) situe entre la couche de réflexion (26) et la couche d'absorption (28). Selon l'invention, la couche d'écartement se compose d'un film ultrafin (24) d'une épaisseur inférieure à 1,0 µm.
EP05761767A 2004-07-05 2005-06-15 Element de securite a effet changeant des couleurs par basculement Withdrawn EP1778500A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004032565A DE102004032565A1 (de) 2004-07-05 2004-07-05 Sicherheitselement mit Farbkippeffekt
PCT/EP2005/006378 WO2006002756A2 (fr) 2004-07-05 2005-06-15 Element de securite a effet changeant des couleurs par basculement

Publications (1)

Publication Number Publication Date
EP1778500A2 true EP1778500A2 (fr) 2007-05-02

Family

ID=35429319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05761767A Withdrawn EP1778500A2 (fr) 2004-07-05 2005-06-15 Element de securite a effet changeant des couleurs par basculement

Country Status (5)

Country Link
US (1) US20070211317A1 (fr)
EP (1) EP1778500A2 (fr)
AU (1) AU2005259626A1 (fr)
DE (1) DE102004032565A1 (fr)
WO (1) WO2006002756A2 (fr)

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US20070211317A1 (en) 2007-09-13
WO2006002756A3 (fr) 2006-08-10
AU2005259626A1 (en) 2006-01-12
DE102004032565A1 (de) 2006-02-16
WO2006002756A2 (fr) 2006-01-12

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