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EP1744905B1 - Schichtartiges wertdokument mit farbgemisch in einer schicht - Google Patents

Schichtartiges wertdokument mit farbgemisch in einer schicht Download PDF

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Publication number
EP1744905B1
EP1744905B1 EP05730712.6A EP05730712A EP1744905B1 EP 1744905 B1 EP1744905 B1 EP 1744905B1 EP 05730712 A EP05730712 A EP 05730712A EP 1744905 B1 EP1744905 B1 EP 1744905B1
Authority
EP
European Patent Office
Prior art keywords
laser
layer
radiation
value document
layers
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.)
Expired - Lifetime
Application number
EP05730712.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1744905A1 (de
Inventor
Georg Depta
Christof Baldus
Karlheinz Mayer
Peter Schiffmann
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
Priority to PL05730712T priority Critical patent/PL1744905T3/pl
Publication of EP1744905A1 publication Critical patent/EP1744905A1/de
Application granted granted Critical
Publication of EP1744905B1 publication Critical patent/EP1744905B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—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
    • 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
    • B42D25/382—Special inks absorbing or reflecting infrared 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
    • B42D25/30—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
    • B42D25/387—Special inks absorbing or reflecting ultraviolet 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/43—Marking by removal of material
    • 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
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • B42D2033/20—
    • B42D2035/24—
    • B42D2035/44—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential
    • Y10T428/24868—Translucent outer layer
    • Y10T428/24876—Intermediate layer contains particulate material [e.g., pigment, etc.]

Definitions

  • the invention relates to a value document, in particular a banknote, with a layer sequence, in which by the action of laser radiation visually and / or machine-recognizable markings in the form of patterns, letters, numbers or images are introduced.
  • the invention also relates to a security element for value documents with such a layer sequence and to methods for producing such value documents or security elements.
  • Identity cards such as credit cards or identity cards
  • the optical properties of the card material in the form of a desired marking are irreversibly changed by suitable guidance of a laser beam.
  • an identity card with applied information is described, which has on a surface of different colored and stacked layer areas, which are at least partially interrupted by visually recognizable personalization data.
  • value documents such as banknotes, stocks, bonds, certificates, vouchers, checks; Tickets and the like, provided with an individualizing tag, such as a serial number.
  • the object of the invention is to propose a value document of the type mentioned at the beginning, which has laser-generated markings of high security against counterfeiting. To further increase the safety and recognizability of the markings in particular be associated with other, hard to imitate optical effects.
  • the layer sequence of the document of value contains a marking layer of a color mixture which has a mixture component absorbing the laser radiation and a mixture component transparent to the laser radiation.
  • the markings are visually and / or mechanically recognizable due to an irreversible change in the optical properties of the paint mixture caused by the action of the laser radiation.
  • the term "layer sequence” designates a sequence of at least one, but as a rule more than one layer arranged above and / or next to one another.
  • optical properties includes primarily the absorption and reflection properties of a material for optical radiation (ultraviolet, visible or infrared radiation), but also other specific responses to the incidence of optical radiation, such as fluorescence or phosphorescence emission.
  • the absorbing mixture component under the action of the laser radiation for example, bleached, evaporated, changed in their reflective properties or by a chemical Reaction can be converted into a material with different optical properties.
  • the introduced markings are visually recognizable without aids. This means that no special equipment is required to illuminate or look at the markings, but that they can be seen by the unaided eye under normal environmental conditions.
  • the color mixture preferably contains optically variable color pigments, in particular optically variable liquid crystal pigments or a transparent or translucent intaglio printing ink and, for example, optically variable interference layer pigments for the absorbing mixture component as the mixture component transparent to the laser radiation.
  • optically variable color pigments in particular optically variable liquid crystal pigments or a transparent or translucent intaglio printing ink and, for example, optically variable interference layer pigments for the absorbing mixture component as the mixture component transparent to the laser radiation.
  • Other color components which can be irreversibly changed in their optical properties such as an intaglio printing ink, a metallic effect ink or metallic pigments, a luminescent color or luminescent pigments, luster pigments or a thermochromic color, are also suitable for the absorbing mixture component.
  • the optical properties of the absorbent mixture component do not change, but that the color mixture contains a color component which interacts with the absorbent mixture component, the optical properties of which are indirect, namely by the absorption of the laser radiation in the absorbent mixture component, in particular the local Temperature shift in the marking layer, irreversibly changed.
  • the color mixture contains, for example, carbon black, graphite, TiO 2 or an infrared absorber.
  • the layer sequence has at least one laser radiation absorbing layer which is arranged between the marking layer and the substrate of the document of value.
  • the layer sequence has at least one layer absorbing the laser radiation and at least one layer transparent to the laser radiation, both of which are arranged between the marking layer and the substrate of the document of value.
  • a layer transparent to the laser radiation is preferably arranged between the absorbing layer and the marking layer. Also advantageously, a (further) transparent to the laser radiation layer between the absorbent layer and the substrate of the document of value is arranged.
  • One or more of the absorbent or transparent layers are structured according to an advantageous development of the invention information leading.
  • the structures are preferably produced at least partially by printing technology. It is also preferred if the information-carrying structures at least partially by the action of the laser radiation, in particular by a partial removal of a absorbent layer are produced.
  • Printing technology structuring and laser ablation can cooperate with particular advantage and complement each other in order to produce special, practically not reproducible printing technology alone effects, such as the pass effects described below.
  • the layer sequence contains, in addition to the marking layer, a further layer of a color mixture which has a mixture component absorbing the laser radiation and a mixture component transparent to the laser radiation.
  • the further color mixture layer is arranged between the marking layer and the substrate of the value document.
  • the further color mixture layer preferably has a color mixture of the type described above for the marking layer. If appropriate, the further color mixture layer is structured in terms of information by printing technology.
  • the transparent mixture component then remains in the further color mixture layer.
  • This embodiment can therefore serve as an alternative to a layering of a transparent and an absorbent layer as a substrate to the marking layer.
  • the effect of the laser radiation makes a colored background visible and it is possible to save a pressure layer and thus a single operation.
  • color mixtures as they are for the Offset FIG. Nyloprint horrinsky be used, optionally with other effect components.
  • a black blend of absorbing milori blue, red and yellow may be used.
  • the information-carrying structuring advantageously forms at least part of the markings, and can be visually recognized on account of the irreversible change in the optical properties of the color mixture.
  • the information-carrying structures are introduced by printing technology in various printing layers, which are covered by an initially opaque or only translucent marking layer. As a result of the action of the laser, the marking layer is partially transparent or even removed, so that the underlying structuring can be recognized.
  • the introduced markings are not visually recognizable or at least not recognizable without auxiliary means.
  • special lighting devices or special viewing devices are required for the detection of the markings, while the markings are essentially invisible to the unaided eye under normal ambient conditions.
  • markings are used particularly with banknotes or other value-representing data carriers with particular advantage because they are essentially invisible to the human eye, the design of the disk is not or only slightly disturbing, they take up little space on the disk and they represent a safety feature for yourself.
  • the introduced markings are preferably recognizable in the infrared spectral range.
  • the markings can stand out from their surroundings, for example, in the IR reflectivity and thus detected by irradiation with an infrared lamp with an infrared detector and evaluated by machine.
  • the introduced markings are recognizable after irradiation with ultraviolet radiation.
  • a different reflectivity in the ultraviolet spectral range can be utilized, or luminescent substances can be provided which emit visible or infrared radiation after excitation with UV radiation.
  • the absorbing mixture component and the transparent mixture component appear in the visible spectral range preferably the same shade, so that the label remains invisible to the naked eye without aids.
  • the color mixture visually preferably has a hue different from black, thus appearing, for example, blue, green or red.
  • the proportion of the transparent mixture component outweighs the proportion of the absorbing mixture component in the color mixture.
  • the transparent mixture component in the color mixture Suitably a proportion of 60% or more, preferably of 70% or more, particularly preferably of 80% or more, on.
  • the layer sequence of the value document has at least one layer absorbing the laser radiation and at least one layer transparent to the laser radiation, wherein at least one of the absorbing or transparent layers contains optically variable color pigments.
  • the markings are visually recognizable in this embodiment due to an area-wise ablation of the at least one absorbing layer caused by the action of the laser radiation.
  • At least one of the layers absorbing or transparent to the laser radiation is advantageously structured in an informative manner, wherein the information-carrying structures can be generated at least partially by printing technology. Likewise advantageously, the information-carrying structures can be generated at least partially by the action of the laser radiation, in particular by a removal of a (further) absorbing layer in regions.
  • the optically variable color pigments are preferably formed by liquid-crystal pigments or interference-layer pigments.
  • machine identifiable characteristics are introduced into a layer sequence of a value document.
  • the layer sequence has at least one layer absorbing the laser radiation and at least one layer transparent to the laser radiation. At the same time appear the absorbing Layer and the transparent layer in the visible spectral range of the same color, and the markings are mechanically recognizable due to a caused by the action of the laser radiation areawise change of the absorbent layer. However, they are not visually recognizable or at least not recognizable without aids.
  • the introduced markings are preferably recognizable in the infrared spectral range or after irradiation with ultraviolet radiation.
  • the absorbing layer and the transparent layer visually advantageously have the same hue different from black.
  • the transparent to the laser radiation layer has a greater thickness than the absorbent layer, so that the markings remain invisible to the naked eye.
  • the absorbent layer is advantageously arranged above the transparent layer so that there is no risk of the transparent layer bursting on absorption of the marking radiation in the absorbent layer.
  • the finishing sequence and the underlying value document substrate have the same color tone in the visible spectral range.
  • the layer sequence has at least one laser radiation absorbing layer.
  • the markings are mechanically recognizable due to an area-wise change in the absorbing layer caused by the action of the laser radiation, but are not recognizable visually or at least not without aids.
  • the introduced markings preferably in the infrared spectral range or after irradiation with ultraviolet radiation recognizable.
  • the absorbing layer and the underlying value document substrate visually preferably have a hue different from black.
  • the absorbent layer is structured in an information-guiding manner.
  • An optionally provided transparent layer can also be structured as an information guide.
  • these information-carrying structures are at least partially produced by printing technology.
  • the information-carrying structures are at least partially generated by the action of the laser radiation, in particular by a removal of an absorbent layer in regions.
  • printing-technical structuring and laser ablation can cooperate with particular advantage and complement one another in order to produce virtually unreproducible effects in terms of printing technology alone.
  • the labels may include an individualization identifier for the value document, such as a serial serial number, a symbol code such as a bar or matrix code, or the like.
  • the invention also includes a security element for value documents, which is provided with a layer sequence according to one of the invention aspects or variants described above.
  • At least one of the layers absorbing or absorbing the laser radiation is advantageously structured in an informative manner, wherein the information-carrying structures are preferably produced at least partially by printing technology.
  • the information-carrying structures can be generated at least partially by the action of the laser radiation, in particular by a removal of a (further) absorbing layer in regions.
  • Suitable laser sources are CO 2 lasers, Nd: YAG lasers, Nd: YVO 4 lasers or other types of lasers in the wavelength range from UV to far-infrared, where the lasers often also advantageously work with frequency doubling or tripling.
  • Laser sources in the near infrared are used with particular advantage, since this wavelength range fits well with the absorption properties of the substrates and printing inks used for value documents. For example, it is easy to specify for this range printing inks which are transparent to the laser radiation but opaque and colored in the visible spectral range for the human observer.
  • YAG laser or Nd with particular advantage infrared laser in the wavelength range from 0.8 microns to 3 microns, in particular Nd be used YVO 4 laser.
  • vectors can be inscribed in the layer sequence, which is advantageous, above all, for fast inscriptions.
  • the working distance between the lens and the substrate is chosen to be slightly less than that required for optimum focusing in order to achieve a slight defocusing of the laser spot.
  • the Nd: YVO 4 laser can be operated, for example, with a pulse frequency between 20 kHz and 80 kHz, a power between 0.5 and 4 W and for a dot resolution of the grid between 250 and 4800 dpi. Again, the laser spot can be easily defocused.
  • Fig. 1 shows a schematic representation of a banknote 10, on the front side in a marking area 12 by the action of a laser beam visually recognizable markings in the form of patterns, letters, numbers or images are introduced.
  • the markings may include, for example, the denomination of the bill, a serial number, a signature, or other text or graphic objects.
  • the markings may also have been initially formed on a transfer element, which was then applied to the banknote, in particular glued.
  • Fig. 2 1 shows a substrate 20, for example a banknote or another value document, on which a marking layer 22 made of a color mixture of two mixture components 24 and 26 is applied.
  • One of the mixture components 24 is transparent to the radiation of the infrared laser used below for marking, the other mixture component 26 absorbs the laser radiation.
  • the marking layer 22 has been irradiated with the marking laser with suitably selected laser parameters to remove, alter, or deactivate the absorbent mixture component 26 by the action of the laser radiation.
  • the absorbent blend component 26 may be bleached, vaporized, altered in reflective properties, or converted to a material having other optical properties by a chemical reaction.
  • the optical properties of the color mixture in the region 28 are irreversibly changed by the irradiation. Possible effects include a change in color, the generation of a color change, the lightening of a color, the change in the tipping color of an effect color mixture or the local change of the polarization properties or the luminescence properties of the marking layer 22.
  • an information-carrying printing layer may be provided between the substrate 20 and the marking layer 22, and the change of the optical properties of the marking layer 22 in the production of transparent portions 28 in an otherwise opaque layer, so that the information of the print layer in these areas after the laser irradiation are visible.
  • a layer sequence 32 is applied which has a first layer 34 transparent to the laser radiation of the selected wavelength, an absorbing layer 36 and a second layer 38 transparent to the laser radiation.
  • At least one of the absorbent or transparent layers contains optically variable color pigments.
  • the transparent layer 34 may include liquid crystal pigments that exhibit a reflection-angle-changing reflection color.
  • the absorbent layer 36 has been removed in a partial region 40, wherein the transparent layer 38 lying above the absorbent layer 36 has been entrained by ablation therewith.
  • the layers 34, 38 transparent to the laser radiation can be opaque and colored in the visible spectral range. Due to the shape and shape of the removed area 40, a variety of markings can be introduced into the layer sequence 32, in which, for example an optically variable color effect of a liquid crystal layer 34 emerges in contrast to a monochrome surrounding area of a second transparent print layer 38.
  • FIG. 4 Another embodiment of the invention is in Fig. 4 shown.
  • a layer sequence 54 is applied in an identification region 52, the layer structure of which is along the line BB of FIG Fig. 4 (a) in the cross-sectional view of Fig. 4 (b) is shown.
  • a print layer 58 which is transparent to infrared radiation but appears to be dark in the visible, is printed in the marking area, and a marking layer 60 composed of an effect ink mixture is applied to this print layer.
  • the effect color mixture contains optically variable liquid-crystal pigments 62 as the transparent mixture component and optically variable interference-layer pigments 64 as the absorbing mixture component.
  • the marking layer 60 first shows the two-color change characteristic of optically variable pigments over the full area when tilting the value document.
  • the layer sequence 54 was then exposed to the infrared radiation of an Nd: YAG laser.
  • the interference layer pigments 64 absorb the laser light and are thereby deactivated and / or removed in the subregion 66. There remain only those transparent to the laser radiation liquid crystal pigments 62, which show the characteristic of liquid crystal pigments color shift effect against the dark background of the print layer.
  • the marking formed by the sub-region 66 when viewed vertically appears in a first color 70 and its surroundings in a second color 72.
  • the liquid crystal pigments 62 produce a third color impression 74 in the acute viewing direction
  • the interference layer pigments 64 a fourth color impression 76.
  • a particularly impressive tipping effect results when the first and fourth colors 70 and 76, and the second and third colors 72 and 74 are chosen the same, because then the color contrast just reverses when the value document is tilted.
  • Such an effect can be achieved by suitable matching of the liquid crystal pigments 62 and the interference layer pigments 64.
  • the information content of the marking is given by the shape of the lasered portion 66.
  • the print layer 58 may be designed to carry information, as in the Fig. 5 illustrated.
  • the payload 80 here the digit sequence "10", introduced by printing technology in the printing layer 82, but initially not visible through the opaque marking layer 60 therethrough.
  • the laser region 84 By exposing the laser region 84 to the radiation of an infrared laser, the absorbing interference-layer pigments 64 are deactivated and / or removed there, so that the printed information 80 is visually recognizable in the now transparent laser region 84.
  • the laser irradiation can be done over a large area, since the payload is represented by printing technology.
  • Fig. 6 first shows an exemplary embodiment with a macroscopic, ie large-area register effect, wherein in Fig. 6 (a) a survey of the marking area 90 of a value document and in the Figs. 6 (b) and 6 (c) the layer structure of the value document and the applied layer sequence along the lines BB and CC of the Fig. 6 (a) is shown.
  • two color layers 94 and 96 are printed side by side, which have the same hue in plan view, but differ in their absorption behavior for the infrared laser radiation.
  • the first color layer 94 is transparent to the laser radiation, absorbing the second color layer 96.
  • the two color layers can also be structured and provided, for example, with a pattern, guilloche, or micro-writing. Also, further print layers may be disposed between the substrate 92 and the two color layers 94, 96.
  • a marking layer 98 composed of an effect color mixture which, in the exemplary embodiment, contains optically variable liquid crystal pigments 100 as a transparent mixture component and metallic pigments 102 as an absorbing mixture component. If the layer sequence is now exposed to infrared laser radiation in a marking region 104, adjacent regions with different visual appearances will result.
  • the original layer sequence is retained even after the laser irradiation, as in FIG Fig. 6 (b) shown.
  • the appearance is dominated by the metallic shimmering metallic pigments 102.
  • the transparent color layer 94 is not changed, but the overlying effect color mixture 98, see FIG Fig. 6 (c) ,
  • the absorbent mixture component, the metallic pigments 102 are removed by the laser radiation, so that in these areas 106 the color-shift effect of the liquid-crystal pigments 100 appears in the background of the color layer 94.
  • FIG. 7 (a) the layer structure of the layer sequence 122 applied to a light security substrate 120 before the laser application.
  • the layer sequence 122 comprises a first color layer 124 transparent to the laser radiation, an absorbing layer 126, a second color layer 128 transparent to the laser radiation, and a marking layer 130 of an effect color mixture which, as in the exemplary embodiment of FIG Fig. 4 contains optically variable liquid crystal pigments 132 and optically variable interference layer pigments 134 as transparent or absorbent mixture components.
  • the effect color mixture has a high proportion of liquid crystal pigments 132, so that the mixture has an overall glaze effect.
  • the color layers 124, 126 and 128 are already applied structured in terms of printing technology, with the first transparent color layer 124 and the absorbing color layer 126 being printed in the exemplary embodiment with a congruent structuring. In the visible, the infrared-transparent color layers 124, 128 may appear red or black, for example.
  • the marking layer 130 is applied over the color layers 124, 126 and 128 over the entire surface.
  • the marking layer 130 in the laser region 136 is converted into a transparent modification by the removal or deactivation of the interference layer pigments 134, so that depending on the background, the color-shift effect of the liquid crystal pigments 132 may be present.
  • the laser radiation Due to the transparent part of the marking layer 130 and the transparent ink layer 128, the laser radiation also reaches the lower-lying absorbing ink layer 126. The action of the laser radiation ablates the laser radiation, whereby it also entrains the areas of the transparent ink layer 128 and the marking layer 130 immediately above it. so that in these areas 146, the first color layer 124 is exposed.
  • the two-color change effect of the interference-layer pigments 134 dominates.
  • the modified marking layer overlies the light-colored security substrate 120, so that the color-shift effect is barely visible when viewed and area 142 appears substantially featurelessly bright.
  • the modified marking layer is disposed over the second color layer 128, so that here the color-shift effect of the liquid crystal pigments 132 is clearly visible through the dark background.
  • the red color layer 124 is visible.
  • Fig. 8 shows the corresponding identification area 150 of the value document in a plan view, wherein the shape of the laser area 152 as large area information represents the number sequence "10", as in Fig. 8 (a) shown.
  • Fig. 8 (b) shows a section 154 in the edge region of the laser region 152, in which the micropasser formed by the micro-digit sequence "10" is clearly visible.
  • the exact structure of the illustrated identification area 150 is best understood in conjunction with FIGS Fig. 7 and 9 the latter, the latter showing the successive structured layers of the layer sequence 122 in a perspective exploded view.
  • Fig. 7 and 9 is the lowest color layer, the first, red color layer 124 in the form of the micro-digit sequence "10" on the in Fig. 9 not shown value document substrate printed.
  • the absorbing ink layer 126 is printed congruently on the first color layer 124 and likewise in the form of the micro-digit sequence "10".
  • the second transparent color layer 128 is how best in Fig. 9 with a visibly glazed color in the form of a checkered pattern with small squares 156 and 158 printed in two different shades of gray.
  • the translucent marking layer 130 is applied over the entire surface of this second ink layer 128, wherein in the Fig. 9 also the part of the laser region 152 that falls in the cutout 154 is shown.
  • the absorbent color layer 126 is removed together with the second transparent color layer 128 and the marking layer 130, so that the microfilm "10" in the red color of the first color layer 124 appears there.
  • Fig. 8 (b) results along the boundary lines 160 of the laser range, a sharp and exact register accurate transition between the two color impressions in the micro-digit. Such a microscopic registration effect can not be reproduced by printing technology.
  • the first transparent color layer 124 may also be absent. In this case, the light value document substrate itself is recognizable in the areas 146.
  • the color mixtures or the layer sequences are each designed so that markings are introduced by the action of the laser radiation, which are visually recognizable without aids.
  • FIGS. 10 to 13 illustrated embodiments show variants of the invention with machine-detectable labels that are not recognizable to the human eye, or only with tools.
  • a value document substrate 170 for example a banknote, on which a marking layer 172 of a color mixture of two mixture components 174 and 176 is applied.
  • One of the mixture components 174 is transparent to the radiation of the infrared laser used subsequently to the marking, the other mixture component 176 absorbs the laser radiation.
  • the two mixture components 174 and 176 are chosen so that they are not distinguishable in color in the visible spectral range for the eye and appear, for example, in the same shade of blue.
  • the marking layer 172 has been irradiated with the marking laser with suitably selected laser parameters to destroy or alter the absorbing mixture component 176 by the action of the laser radiation.
  • the mechanism of destruction or alteration of the IR-absorbing material upon exposure to the laser beam is not relevant to the present invention.
  • the lasered region 178 does not stand out from its surroundings with suitably selected mixture proportions with the naked eye.
  • the marking layer 172 thus appears to the viewer as a homogeneous monochromatic layer, as in FIG Fig. 11 (a) Illustrated, which shows the visual appearance of a corresponding section of the value document in supervision.
  • FIG. 11 (b) shows by way of example the same section as Fig. 11 (a) when illuminated with an IR lamp, taken with an IR camera.
  • the value document can thus be provided with visually invisible, but easy-to-read individualizations that require little space on the value document, and which do not significantly affect the value document design.
  • the individualizations can be embodied in particular in the form of barcodes or matrix codes.
  • the latter are preferred in the value document area, as they allow to represent a high information content in a small area.
  • the absorbent mixture component 176 may also be only partially removed with the marking laser to obtain different brightness levels in the reflected infrared image and to avoid visually recognizable information in the visible range.
  • CIPB 15 or 15: 3 pigment: Cu-II-phthalocyanine
  • Milori blue CIPB 27 pigment: an iron cyanide compound having the formula Fe 4 [Fe- (CN) 6 ] 3 ⁇ H 2 O.
  • the proportion of the IR-transparent mixture component is greater than that of the IR-absorbing component.
  • the color ratio of phthalocyanine blue and milori blue may be 70:30 or even 90:10.
  • a green can be used as the IR-transparent mixture component Phthalocyan C.I. P. G. 7 (pigment: chlorinated Cu-II-phthalocyanine green and as IR-absorbing compound component chromium oxide green (chromium III oxide hydrate).
  • a gray can be obtained by using diaryl yellow C.I. P.Y 13, phthalocyanine blue C.I. P. B. 15 ( ⁇ -modification) or 15: 3 ( ⁇ -modification) and Naphtol AS-Red C.I. P.R. 146 (pigment: monoazo pigment with 2-hydroxy-3-naphthoic acid arylidene) as IR-transparent mixture components and carbon black C.I. P.BI. 7 or graphite can be obtained as IR-absorbing mixture component.
  • the marking laser for a vectors, so lines in the layer sequence can be written, which is especially for quick captions, as they are needed in the environment of a printing office, is advantageous.
  • the marking laser can also be operated in a raster mode in which the laser beam scans the substrate surface and the laser power is selectively switched on at those raster points at which lasering is to take place. This variant is particularly advantageous for the illustration and labeling of maps or data pages of passports.
  • Fig. 12 shows a variant according to another embodiment of the invention.
  • the security substrate 180 there is a layer sequence 182 in which, above an IR-transparent layer 184 an IR-absorbing layer 186 is arranged, wherein the absorbing layer and the transparent layer in the visible spectral region appear to be the same color tone.
  • the two layers can be used in particular with printing inks associated with Fig. 10 pigments are printed on the substrate 180.
  • an identification 188 is introduced into the IR-absorbing layer 186, for example by chemical modification or destruction of the IR-absorbing pigments or ablation of the layer or pigments.
  • the underlying IR transparent layer 184 is not changed by the laser radiation. Since the two layers are the same color shade in the visible spectral range, the layer sequence 182 appears to the viewer as a uniform colored surface even after laser marking. As described above, when the value document is irradiated with IR radiation, the marking can be read out on the basis of the lower reflectivity in the region 188.
  • FIG. 13 Another variant of the invention is in Fig. 13 shown.
  • an IR absorbing layer 196 is deposited on a color matching substrate 190, such that a laser-engraved marking 198 does not visually appear.
  • the tag 198 does, as in 10 to 12 , Only in the infrared spectral range by the lower reflectivity noticeable and can be read by machine.
  • upconversion pigments may also be used (e.g., UC2 from Honeywell, rare earth oxysulfide).
  • a UV code may be included in an orange tagging layer 172 (FIG. Fig. 10 ), which contains disazopyrazolone orange CIPO 34 as UV-transparent mixture component and perinone orange CIPO 43 as UV-absorbing component.
  • luminescent paints that fluoresce or phosphoresce after excitation with UV light and thus become recognizable only by the aid of a UV excitation source. It is also possible to combine different luminescent substances with one another. Suitable luminescent substances are, above all, organic pigments but also many inorganic pigments.

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EP05730712.6A 2004-05-05 2005-04-05 Schichtartiges wertdokument mit farbgemisch in einer schicht Expired - Lifetime EP1744905B1 (de)

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ATE370845T1 (de) * 2002-05-08 2007-09-15 Kurz Leonhard Fa Mehrschichtenk rper mit mindestens einer lasersensitives mat erial aufweisenden schicht
CN100572089C (zh) 2002-07-18 2009-12-23 德国捷德有限公司 有价文件
US20040126503A1 (en) * 2002-12-19 2004-07-01 Matthias Kuntz Process for laser marking of a liquid crystal film
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WO2005108108A2 (de) 2004-04-30 2005-11-17 Giesecke & Devrient Gmbh Sicherheitselement und verfahren zu seiner herstellung
WO2005105475A1 (de) 2004-04-30 2005-11-10 Giesecke & Devrient Gmbh Folienmaterial und verfahren zu seiner herstellung
DE102004021246A1 (de) 2004-04-30 2005-11-24 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
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DE102004022080A1 (de) 2004-05-05 2005-11-24 Giesecke & Devrient Gmbh Wertdokument mit visuell erkennbaren Kennzeichnungen
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DE102004049118A1 (de) 2004-10-07 2006-04-13 Giesecke & Devrient Gmbh Sicherheitselement und Verfahren zu seiner Herstellung
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DE102005032997A1 (de) 2005-07-14 2007-01-18 Giesecke & Devrient Gmbh Gitterbild und Verfahren zu seiner Herstellung
DE102005061749A1 (de) 2005-12-21 2007-07-05 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement und Verfahren zu seiner Herstellung
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WO2005108110A1 (de) 2005-11-17
CA2562262A1 (en) 2005-11-17
DE102004022080A1 (de) 2005-11-24
CN1946569A (zh) 2007-04-11
EP1744905A1 (de) 2007-01-24
RU2006142489A (ru) 2008-06-10
MY146727A (en) 2012-09-14
CA2562262C (en) 2012-10-09
US8936846B2 (en) 2015-01-20
AU2005240277A1 (en) 2005-11-17
US20090008926A1 (en) 2009-01-08
CN100506560C (zh) 2009-07-01
PL1744905T3 (pl) 2015-01-30
AU2005240277B2 (en) 2010-06-10

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