EP1744899B1 - Security document - Google Patents

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Publication number
EP1744899B1
EP1744899B1 EP05739640A EP05739640A EP1744899B1 EP 1744899 B1 EP1744899 B1 EP 1744899B1 EP 05739640 A EP05739640 A EP 05739640A EP 05739640 A EP05739640 A EP 05739640A EP 1744899 B1 EP1744899 B1 EP 1744899B1
Authority
EP
European Patent Office
Prior art keywords
coating
security paper
laser
value document
marking
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.)
Revoked
Application number
EP05739640A
Other languages
German (de)
French (fr)
Other versions
EP1744899A1 (en
Inventor
Georg Depta
Karlheinz Mayer
Christof Baldus
Peter Franz
Max Voit
Walter DÖRFLER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34966637&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1744899(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE200410027306 external-priority patent/DE102004027306A1/en
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to PL05739640T priority Critical patent/PL1744899T3/en
Publication of EP1744899A1 publication Critical patent/EP1744899A1/en
Application granted granted Critical
Publication of EP1744899B1 publication Critical patent/EP1744899B1/en
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • 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
    • B42D25/355—Security threads
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42—Ribbons or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B42D2033/10—
    • B42D2033/26—
    • 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
    • B42D25/24—Passports

Definitions

  • the invention relates to a document of value, such as a banknote, identity card, passport or the like, which has a security paper and a marking produced by means of a laser, wherein the security paper has at least one partial area with a coating. Furthermore, the invention relates to a security paper and method for producing a value document or security paper according to the invention.
  • Banknotes, checks, tickets, tickets and other documents of value, in particular made of paper, are equipped with security features for the purpose of forgery-proofing, by means of which the authenticity of the value documents can be checked.
  • US 6,139,065 discloses a document of value comprising a security paper and a print.
  • the value document may further be provided with a security thread.
  • the imprint on the document of value and an optionally arranged on the security thread imprint are applied with conventional printing methods, so-called pressure-form-bonded printing method, but not by means of a laser.
  • WO 03/023723 A1 For example, a document of value is known in which two materials, which have different resistances to a laser and are arranged adjacent to one another, are deposited on a substrate, which can be made of paper, for example.
  • the two materials deposited on the substrate have a laser mark, which is produced by sublimation of a part of the deposited material under the action of the laser beam.
  • the substrate itself is not substantially burned or sublimated by the laser beam.
  • the object of the present invention is to propose a value document and a security paper with an improved visual security feature, which has a high security against counterfeiting, and a method for producing such a security feature.
  • a security document according to the invention such as a banknote, a passport or the like, has a security paper and a laser-generated marking, wherein the security paper is provided with a coating at least in a partial area, and the marking over the boundary area between coating and security paper extends. Since the laser is continuously guided over the document of value in the form of the marking and the laser radiation influences the coating and the paper substrate differently, the marking shows a different appearance in the different areas, wherein these different appearances merge directly into one another. The marking thus appears at the transition in the boundary region between coating and security paper with perfect Passerhaltmaschine, whereby the achieved with this mark counterfeiting security compared to a reprint is very high.
  • the coating comprises at least one metal layer, e.g. Aluminum, gold, silver etc., on.
  • the metal layer is removed, so that the lying in the metal layer part of the marker is in the form of recesses in the metal layer. Since the laser beam is continuously guided across the boundary between the coating and the security paper, the negative representation of the marking merges seamlessly into a positive representation in the area of the security paper.
  • the type and color shade of the color change depends on the composition of the security paper used. This color change or color change can be enhanced by suitable additives which may be contained in the volume of the security paper, the sizing or a subsequent primer. The type of additives used depends on the type of laser used or the laser wavelength used.
  • Conceivable are laser radiation absorbing additives, such as carbon black, thermochromic substances or titanium dioxide.
  • the lying in the security paper part of the marker according to the invention can also be designed to be tactile tactile, as in the WO 204/009371 described.
  • the metal layer according to the invention may be a layer containing printed, metal pigments or metallic effect pigments or a vapor-deposited or sputtered layer.
  • the metal layer is preferably prepared on a separate carrier and applied to the security paper or document of value in the form of a label or transfer element.
  • labels or transfer elements may also comprise any further layers, such as e.g. a lacquer layer, in which diffraction structures are embossed in the form of a relief.
  • the metal layer usually serves as a reflection layer for the diffraction structures.
  • the coating may be formed as a laser-sensitive recording layer, wherein it has at least one component absorbing laser radiation of a selected wavelength.
  • a color mixture which has a mixture component which absorbs the laser radiation and a mixture component transparent to the laser radiation is suitable as the laser-sensitive recording layer.
  • the marking is due to a caused by the action of the laser radiation irreversible change in the optical Properties of the color mixture visually recognizable.
  • the absorbing mixture component may for example be bleached, vaporized, changed in its reflection properties under the action of the laser radiation or converted by a chemical reaction into a material having different optical properties.
  • the color mixture preferably contains optically variable color pigments, with transparent mixture components, in particular optically variable liquid-crystal pigments, being used for the laser radiation, and, for example, optically variable interference-layer pigments for the absorbing mixture component.
  • Such a coating shows a change in color when the viewing angle is changed, the perceptible color impression representing a superimposition of the color impressions of the various optically variable color pigments.
  • the color impression of the interference layer pigments disappears or changes, so that the lasered areas contrast in color with the surroundings.
  • the lasered areas still show an optically variable effect. If the lasered marking extends over the boundary region between the coating and the security paper, the optically variable fraction of the marking is converted into a non-optically variable fraction which is produced by lasering the paper substrate. This gives the impression that the marking has been produced with different methods in an exact register.
  • a very similar appearance of the marking can be produced if the parts of the mixture which are transparent and absorbing for laser radiation are arranged one above the other in separate layers.
  • Nd YAG lasers having a wavelength of 1064 nm are preferably used.
  • the laser can be used in continuous wave mode or in pulsed mode.
  • pulsed operation a visible variation in the degree of blackening over the course of the mark can be generated in the security paper.
  • alphanumeric characters can be represented, for example serial numbers of the value documents or any codes, such as one-dimensional or two-dimensional bar codes or blind codes, any symbols, graphics, patterns, images or micro-writing. Any alphanumeric characters, such as date, time, batch name, or lettering are possible.
  • Each mark according to the invention extends beyond the boundary of the coating into the security paper, whereby at the transition the appearance of the mark changes with perfect passer-like behavior.
  • the value document according to the invention may contain further security features, such as a security thread, an optically variable security element, a security imprint, such. As a gravure printing, or machine-readable security features, such as luminescent or magnetic substances have. If the document of value has a security thread, the inventive laser marking can also in Be provided for the security thread.
  • the value documents according to the invention can also be used to secure products of any kind.
  • the value document according to the invention is any document whose essential component is a security paper, such as a banknote, a check, a visa, a label, a passport or another document to be secured from security paper.
  • a security paper such as a banknote, a check, a visa, a label, a passport or another document to be secured from security paper.
  • the laser marking step takes place at any stage in the production of the value document. So it may be useful to provide the security paper after production in roll form with a corresponding mark. This is the case, in particular, when the security paper is provided in continuous form with a film coating, such as a diffraction-optically effective, for example, strip-shaped security element, and this security element is to be provided with a marking according to the invention as described above.
  • a film coating such as a diffraction-optically effective, for example, strip-shaped security element
  • the step of laser marking is preferably carried out as one of the last working steps in the production of the value document. If the value documents are printed, for example, in the form of sheet-shaped multiple uses, the laser marking can still take place on the sheet or already on the cut, finished value document. The latter is particularly useful if individual information, such as a serial number, is to be generated by means of the laser marking:
  • a particular safety advantage of the present invention is the fact that the effect described can not be adjusted by simple means.
  • the use of lasers requires high investments and in-depth technical know-how, which goes far beyond the level of knowledge required for the use of conventional printing presses or digital printing devices.
  • a further advantage of the invention is that the laser marking can be carried out without contact in a speed typical for printing companies.
  • each document can be individually marked, for example, by integrating the serial number or another individualizing feature as a security feature in the value document.
  • Fig. 1 shows a value document 1 according to the invention in the form of a banknote.
  • the value document 1 according to the invention has a marking 2 in the form of a number sequence, which was generated by the action of a laser beam and extends into the edge region of the banknote 1.
  • Fig. 2 shows an enlarged detail of the area A of Fig.1 ,
  • the transition of the marking 2 which is essential to the invention, over the boundary region between the coating 3 and the security paper 4 within the illustrated "4" can be clearly seen.
  • the marker 2 continues seamlessly and without offset. Due to the darker gray level of the marking in the area of the security paper 4, the transition is clearly visible and appears with perfect Passerhaltmaschine, which would be unavailable for a printed mark.
  • the Fig. 3 shows a section through the value document 1 along the line BB.
  • a coating 3 in the form of a security element 3 is arranged in the region of the marking 2, the security element 3 consisting of a transfer element.
  • the transfer element is attached to the value document 1 by means of an adhesive layer 5.
  • an adhesive layer 5 Between the adhesive layer 5 and a plastic layer 7, in particular lacquer layer 7, there is a metal layer 6.
  • Fig. 4 shows a section through the value document 1 along the line CC. It can be seen that this metal layer 6 is missing in the region of the marking 2. In the labeling or marking process with the laser, the metal layer 6 is changed so that it is no longer visible.
  • the reference numeral 8 denotes the area acted upon by the laser radiation.
  • Fig. 5 shows a section through the value document 1 along the line DD. It is a caused by the laser marking color change 9 in the security paper (substrate) to see 4, which is part of the mark belonging to and recognizable in supervision "8". In this example, an "8" is shown with a black level corresponding to a dark gray level. The laser power must be adjusted to the desired degree of blackening.
  • the appearance or the representation of the marking 2 changes in the boundary region A.
  • the marking 2 is represented in the form of recesses 8 in the metal layer 6, ie as a negative representation, while the marking 2 outside the security element 3 in the form of color changes, ie as a positive representation exists.
  • Fig. 6 shows a security paper (substrate) 20, such as a banknote or other value document, on which a coating 22 of a color mixture of two mixture components 24 and 26 is applied.
  • a security paper substrate 20
  • 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 color change, 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 coating 22.
  • an information-carrying printing layer may be provided between the substrate 20 and the coating 22, and the change in the optical properties of the coating 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 coating 32 is applied to a substrate 30 which has a first transparent layer 34 for 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.
  • the shape and shape of the removed area 40 can bring a variety of markings into the coating 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 printed layer 38.
  • the portion of the label produced in the various coatings proceeds in the form of a change in color and / or contrast in the surrounding substrate material.

Description

Die Erfindung betrifft ein Wertdokument, wie zum Beispiel Banknote, Ausweiskarte, Passbuch oder dergleichen, das ein Sicherheitspapier und eine mithilfe eines Lasers erzeugte Markierung aufweist, wobei das Sicherheitspapier wenigstens einen Teilbereich mit einer Beschichtung aufweist. Des Weiteren betrifft die Erfindung ein Sicherheitspapier und Verfahren zur Herstellung eines erfindungsgemäßen Wertdokuments bzw. Sicherheitspapiers.The invention relates to a document of value, such as a banknote, identity card, passport or the like, which has a security paper and a marking produced by means of a laser, wherein the security paper has at least one partial area with a coating. Furthermore, the invention relates to a security paper and method for producing a value document or security paper according to the invention.

Banknoten, Schecks, Fahrkarten, Eintrittskarten und andere Wertdokumente, insbesondere aus Papier, werden zum Zwecke der Fälschungssicherheit mit Sicherheitsmerkmalen ausgestattet, anhand deren die Echtheit der Wertdokumente überprüfbar ist.Banknotes, checks, tickets, tickets and other documents of value, in particular made of paper, are equipped with security features for the purpose of forgery-proofing, by means of which the authenticity of the value documents can be checked.

In diesem Zusammenhang ist vorgeschlagen worden, Markierungen mittels Laserstrahlung auf einem Dokument aufzubringen, um dadurch eine irreversible und visuell leicht erfassbare Veränderung des Dokuments zu erzielen. So wird beispielsweise in der DE 28 36 529 C2 vorgeschlagen, mittels eines geeignet gesteuerten Laserstrahls die Seriennummer aus einer Druckfarbschicht herauszubrennen. In der EP 0 918 649 B1 wird vorgeschlagen, die Identifikationsnummer durch örtliche Verringerung der Dokumentendicke mittels Laserätzung an anderer Stelle des Dokuments zu wiederholen. In den beiden vorgenannten Fällen wird also jeweils Material mittels Laserstrahlung abgetragen.In this connection, it has been proposed to apply laser radiation markings on a document in order to achieve an irreversible and visually easily detectable change of the document. For example, in the DE 28 36 529 C2 proposed to burn out the serial number from a printing ink layer by means of a suitably controlled laser beam. In the EP 0 918 649 B1 It is proposed to repeat the identification number by locally reducing the document thickness by means of laser etching elsewhere in the document. In the two aforementioned cases, in each case material is thus removed by means of laser radiation.

Demgegenüber sehen andere Ansätze vor, das Substratmaterial mittels Laserstrahlung lediglich zu schwärzen. Um besonders gut lesbare und kantenscharfe Markierungen zu erzielen, ist es auch bekannt, dem Papier Absorptionsmittel und Kohlenstoffbildner beizumischen, beispielsweise mikrovermahlene Kunststoffe ( DE 197 32 860 A1 ).In contrast, other approaches provide to merely blacken the substrate material by means of laser radiation. In order to achieve particularly legible and edge-sharp markings, it is also known to the paper To mix absorbent and carbon formers, such as micro-milled plastics ( DE 197 32 860 A1 ).

Einen anderen Weg geht die DE 198 22 605 A1 . Darin wird vorgeschlagen, die Papiersubstratoberfläche zunächst mit Laserenergie zu behandeln, um die Oberfläche strukturell zu verändern, und diese anschließend mit einer opaken Beschichtung zu versehen, beispielsweise durch Bedrucken, Lackieren und/oder Metallisieren. Das vorherige Verändern der Oberfläche führt bei der nachfolgend aufgebrachten Beschichtung zu einer erkennbaren Veränderung der Farbdichte, des Farborts, des Glanzes und/oder der Reflexion, wodurch ein sichtbares Sicherheitsmerkmal entsteht.Another way is the DE 198 22 605 A1 , It is proposed to first treat the paper substrate surface with laser energy in order to structurally alter the surface and then to provide it with an opaque coating, for example by printing, painting and / or metallizing. The prior modification of the surface results in the subsequently applied coating to a noticeable change in the color density, the color location, the gloss and / or the reflection, whereby a visible security feature arises.

US 6,139,065 offenbart ein Wertdokument, das ein Sicherheitspapier und einen Aufdruck aufweist. In einer bevorzugten Ausführungsform kann das Wertdokument ferner mit einem Sicherheitsfaden versehen sein. Der Aufdruck auf dem Wertdokument und ein gegebenenfalls auf dem Sicherheitsfaden angeordneter Aufdruck werden mit konventionellen Druckverfahren, sogenannten druckformgebundenen Druckverfahren aufgebracht, nicht jedoch mittels eines Lasers. US 6,139,065 discloses a document of value comprising a security paper and a print. In a preferred embodiment, the value document may further be provided with a security thread. The imprint on the document of value and an optionally arranged on the security thread imprint are applied with conventional printing methods, so-called pressure-form-bonded printing method, but not by means of a laser.

Aus WO 03/023723 A1 ist ein Wertdokument bekannt, bei dem auf einem Substrat, welches beispielsweise aus Papier bestehen kann, zwei Materialien aufgelagert sind, die unterschiedliche Widerstände gegenüber einem Laser haben und aneinander angrenzend angeordnet sind. Die beiden auf dem Substrat aufgelagerten Materialien weisen eine Lasermarkierung auf, die durch Sublimation eines Teil des aufgelagerten Materials unter Einwirkung des Laserstrahls erzeugt ist. Das Substrat selbst wird durch den Laserstrahl allerdings im Wesentlichen nicht verbrannt oder sublimiert.Out WO 03/023723 A1 For example, a document of value is known in which two materials, which have different resistances to a laser and are arranged adjacent to one another, are deposited on a substrate, which can be made of paper, for example. The two materials deposited on the substrate have a laser mark, which is produced by sublimation of a part of the deposited material under the action of the laser beam. However, the substrate itself is not substantially burned or sublimated by the laser beam.

Aufgabe der vorliegenden Erfindung ist es, ein Wertdokument und ein Sicherheitspapier mit einem verbesserten visuellen Sicherheitsmerkmal vorzuschlagen, das eine hohe Fälschungssicherheit aufweist, sowie ein Verfahren zur Herstellung eines solchen Sicherheitsmerkmals.The object of the present invention is to propose a value document and a security paper with an improved visual security feature, which has a high security against counterfeiting, and a method for producing such a security feature.

Diese Aufgabe wird durch das Wertdokument und das Sicherheitspapier mit den Merkmalen der unabhängigen Ansprüche gelöst. Verfahren zur Herstellung derselben sind in nebengeordneten Ansprüchen angegeben. Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the value document and the security paper having the features of the independent claims. Processes for the preparation thereof are given in the independent claims. Further developments of the invention are the subject of the dependent claims.

Ein erfindungsgemäßes Wertdokument, wie z.B. eine Banknote, ein Passbuch oder dergleichen, weist ein Sicherheitspapier und eine mithilfe eines Lasers erzeugte Markierung auf, wobei das Sicherheitspapier wenigstens in einem Teilbereich mit einer Beschichtung versehen ist, und sich die Markierung über den Grenzbereich zwischen Beschichtung und Sicherheitspapier erstreckt. Da der Laser kontinuierlich in Form der Markierung über das Wertdokument geführt wird und die Laserstrahlung die Beschichtung und das Papiersubstrat unterschiedlich beeinflusst, zeigt die Markierung in den verschiedenen Bereichen ein unterschiedliches Erscheinungsbild, wobei diese unterschiedlichen Erscheinungsbilder direkt ineinander übergehen. Die Markierung erscheint somit am Übergang im Grenzbereich zwischen Beschichtung und Sicherheitspapier mit perfekter Passerhaltigkeit, wodurch die mit dieser Markierung erreichte Fälschungssicherheit gegenüber einem Nachdruck sehr hoch ist.A security document according to the invention, such as a banknote, a passport or the like, has a security paper and a laser-generated marking, wherein the security paper is provided with a coating at least in a partial area, and the marking over the boundary area between coating and security paper extends. Since the laser is continuously guided over the document of value in the form of the marking and the laser radiation influences the coating and the paper substrate differently, the marking shows a different appearance in the different areas, wherein these different appearances merge directly into one another. The marking thus appears at the transition in the boundary region between coating and security paper with perfect Passerhaltigkeit, whereby the achieved with this mark counterfeiting security compared to a reprint is very high.

Gemäß einer bevorzugten Ausführungsform weist die Beschichtung wenigstens eine Metallschicht, wie z.B. Aluminium, Gold, Silber etc., auf. Durch die Einwirkung der Laserstrahlung wird die Metallschicht entfernt, so dass der in der Metallschicht liegende Teil der Markierung in Form von Aussparungen in der Metallschicht vorliegt. Da der Laserstrahl kontinuierlich über den Grenzbereich zwischen Beschichtung und Sicherheitspapier geführt wird, geht die Negativdarstellung der Markierung nahtlos in eine Positivdarstellung im Bereich des Sicherheitspapiers über.According to a preferred embodiment, the coating comprises at least one metal layer, e.g. Aluminum, gold, silver etc., on. By the action of the laser radiation, the metal layer is removed, so that the lying in the metal layer part of the marker is in the form of recesses in the metal layer. Since the laser beam is continuously guided across the boundary between the coating and the security paper, the negative representation of the marking merges seamlessly into a positive representation in the area of the security paper.

Denn die Lasereinwirkung führt zu einem Farbumschlag oder einer Farbveränderung des Sicherheitspapiers im markierten Bereich. Die Art und der Farbton der Farbänderung hängt von der Zusammensetzung des verwendeten Sicherheitspapiers ab. Dieser Farbumschlag bzw. Farbänderung kann durch geeignete Zusatzstoffe verstärkt werden, die im Volumen des Sicherheitspapiers, der Leimung oder einer nachträglichen Grundierung enthalten sein können. Die Art der verwendeten Zusatzstoffe ist dabei von der Art des verwendeten Lasers bzw. der verwendeten Laserwellenlänge abhängig.Because the laser action leads to a color change or a color change of the security paper in the marked area. The type and color shade of the color change depends on the composition of the security paper used. This color change or color change can be enhanced by suitable additives which may be contained in the volume of the security paper, the sizing or a subsequent primer. The type of additives used depends on the type of laser used or the laser wavelength used.

Denkbar sind Laserstrahlung absorbierende Zusätze, wie beispielsweise Ruß, thermochrome Stoffe oder Titandioxid.Conceivable are laser radiation absorbing additives, such as carbon black, thermochromic substances or titanium dioxide.

Der im Sicherheitspapier liegende Teil der erfindungsgemäßen Markierung kann auch taktil fühlbar ausgestaltet sein, wie in der WO 204/009371 beschrieben.The lying in the security paper part of the marker according to the invention can also be designed to be tactile tactile, as in the WO 204/009371 described.

Die erfindungsgemäße Metallschicht kann eine gedruckte, Metallpigmente oder Metalleffektpigmente enthaltende Schicht oder eine aufgedampfte bzw. aufgesputterte Schicht sein.The metal layer according to the invention may be a layer containing printed, metal pigments or metallic effect pigments or a vapor-deposited or sputtered layer.

In letzterem Fall wird die Metallschicht vorzugsweise auf einen separaten Träger vorbereitet und in Form eines Etiketts oder Transferelements auf das Sicherheitspapier bzw. Wertdokument aufgebracht. Derartige Etiketten oder Transferelemente können auch beliebige weitere Schichten aufweisen, wie z.B. eine Lackschicht, in welche Beugungsstrukturen in Form eines Reliefs eingeprägt sind. Die Metallschicht dient hierbei üblicherweise als Reflexionsschicht für die Beugungstrukturen.In the latter case, the metal layer is preferably prepared on a separate carrier and applied to the security paper or document of value in the form of a label or transfer element. Such labels or transfer elements may also comprise any further layers, such as e.g. a lacquer layer, in which diffraction structures are embossed in the form of a relief. The metal layer usually serves as a reflection layer for the diffraction structures.

Gemäß einer weiteren Ausführungsform kann die Beschichtung als lasersensitive Aufzeichnungsschicht ausgebildet sein, wobei sie mindestens eine für Laserstrahlung einer ausgewählten Wellenlänge absorbierende Komponente aufweist. Beispielsweise ist als lasersensitive Aufzeichnungsschicht ein Farbgemisch geeignet, das eine die Laserstrahlung absorbierende Gemischkomponente und eine für die Laserstrahlung transparente Gemischkomponente aufweist. Die Markierung ist dabei aufgrund einer durch die Einwirkung der Laserstrahlung bewirkten irreversiblen Änderung der optischen Eigenschaften des Farbgemisches visuell erkennbar. Die absorbierende Gemischkomponente kann unter der Einwirkung der Laserstrahlung beispielsweise gebleicht, verdampft, in ihren Reflexionseigenschaften verändert oder durch eine chemische Reaktion in ein Material mit anderen optischen Eigenschaften umgewandelt werden.According to a further embodiment, the coating may be formed as a laser-sensitive recording layer, wherein it has at least one component absorbing laser radiation of a selected wavelength. By way of example, a color mixture which has a mixture component which absorbs the laser radiation and a mixture component transparent to the laser radiation is suitable as the laser-sensitive recording layer. The marking is due to a caused by the action of the laser radiation irreversible change in the optical Properties of the color mixture visually recognizable. The absorbing mixture component may for example be bleached, vaporized, changed in its reflection properties under the action of the laser radiation or converted by a chemical reaction into a material having different optical properties.

Vorzugsweise enthält das Farbgemisch optisch variable Farbpigmente, wobei für die Laserstrahlung transparente Gemischkomponente insbesondere optisch variable Flüssigkristallpigmente und für die absorbierende Gemischkomponente beispielsweise optisch variable Interferenzschichtpigmente infrage kommen.The color mixture preferably contains optically variable color pigments, with transparent mixture components, in particular optically variable liquid-crystal pigments, being used for the laser radiation, and, for example, optically variable interference-layer pigments for the absorbing mixture component.

Eine derartige Beschichtung zeigt bei Änderung des Betrachtungswinkels ein Farbwechselspiel, wobei der wahrnehmbare Farbeindruck eine Überlagerung der Farbeindrücke der verschiedenen optisch variablen Farbpigmente darstellt. Durch die Lasereinwirkung verschwindet oder ändert sich der Farbeindruck der Interferenzschichtpigmente, so dass die gelaserten Bereiche farblich zur Umgebung kontrastieren. Die gelaserten Bereiche zeigen jedoch nach wie vor einen optisch variablen Effekt. Erstreckt sich die gelaserte Markierung über den Grenzbereich zwischen Beschichtung und Sicherheitspapier, so wird der optisch variable Anteil der Markierung in einen nicht optisch variablen Anteil übergeführt, der durch Laserung des Papiersubstrats entsteht. Dadurch entsteht der Eindruck, dass die Markierung mit unterschiedlichen Verfahren in einem exakten Passer erzeugt wurde.Such a coating shows a change in color when the viewing angle is changed, the perceptible color impression representing a superimposition of the color impressions of the various optically variable color pigments. As a result of the laser effect, the color impression of the interference layer pigments disappears or changes, so that the lasered areas contrast in color with the surroundings. The lasered areas, however, still show an optically variable effect. If the lasered marking extends over the boundary region between the coating and the security paper, the optically variable fraction of the marking is converted into a non-optically variable fraction which is produced by lasering the paper substrate. This gives the impression that the marking has been produced with different methods in an exact register.

Ein sehr ähnliches Erscheinungsbild der Markierung kann erzeugt werden, wenn die für Laserstrahlung transparenten und absorbierenden Anteile des Gemisches in getrennten Schichten übereinander angeordnet werden.A very similar appearance of the marking can be produced if the parts of the mixture which are transparent and absorbing for laser radiation are arranged one above the other in separate layers.

Für die Erzeugung der Markierung werden vorzugsweise Nd:YAG-Laser mit einer Wellenlänge von 1064 nm verwendet. Je nach Art der zu erzeugenden Markierung kann der Laser im Dauerstrichbetrieb oder im gepulsten Betrieb eingesetzt werden. Beispielsweise kann im gepulsten Betrieb eine sichtbare Variation des Schwärzungsgrads über den Verlauf der Markierung im Sicherheitspapier erzeugt werden.For the generation of the label, Nd: YAG lasers having a wavelength of 1064 nm are preferably used. Depending on the type of mark to be produced, the laser can be used in continuous wave mode or in pulsed mode. For example, in pulsed operation, a visible variation in the degree of blackening over the course of the mark can be generated in the security paper.

Mittels der Lasermarkierung können alphanumerische Zeichen dargestellt werden, beispielsweise Seriennummern der Wertdokumente oder beliebige Codes, wie beispielsweise eindimensionale oder zweidimensionale Balkencodes oder Blindencodes, beliebige Symbole, Graphik, Muster, Bilder oder Mikroschrift. Auch beliebige alphanumerische Zeichen, wie Datum, Uhrzeit, Chargenbezeichnung, oder Schriftzüge sind möglich. Jede erfindungsgemäße Markierung erstreckt sich über die Grenze der Beschichtung hinweg in das Sicherheitspapier hinein, wodurch am Übergang das Erscheinungsbild der Markierung mit perfekter Passerhaltigkeit wechselt.By means of laser marking, alphanumeric characters can be represented, for example serial numbers of the value documents or any codes, such as one-dimensional or two-dimensional bar codes or blind codes, any symbols, graphics, patterns, images or micro-writing. Any alphanumeric characters, such as date, time, batch name, or lettering are possible. Each mark according to the invention extends beyond the boundary of the coating into the security paper, whereby at the transition the appearance of the mark changes with perfect passer-like behavior.

Das erfindungsgemäße Wertdokument kann weitere Sicherheitsmerkmale, wie beispielsweise einen Sicherheitsfaden, ein optisch variables Sicherheitselement, einen Sicherheitsaufdruck, wie z. B. einen Stichtiefdruck, oder maschinell lesbare Sicherheitsmerkmale, wie beispielsweise lumineszierende oder magnetische Stoffe, aufweisen. Falls das Wertdokument einen Sicherheitsfaden aufweist, kann die erfindungsgemäße Lasermarkierung auch im Bereich des Sicherheitsfadens vorgesehen werden. Die erfindungsgemäßen Wertdokumente können auch zur Absicherung von Produkten beliebiger Art verwendet werden.The value document according to the invention may contain further security features, such as a security thread, an optically variable security element, a security imprint, such. As a gravure printing, or machine-readable security features, such as luminescent or magnetic substances have. If the document of value has a security thread, the inventive laser marking can also in Be provided for the security thread. The value documents according to the invention can also be used to secure products of any kind.

Das erfindungsgemäße Wertdokument ist ein beliebiges Dokument, dessen wesentlicher Bestandteil ein Sicherheitspapier darstellt, wie beispielsweise eine Banknote, ein Scheck, ein Visum, ein Etikett, eine Passseite oder ein anderes zu sicherndes Dokument aus Sicherheitspapier.The value document according to the invention is any document whose essential component is a security paper, such as a banknote, a check, a visa, a label, a passport or another document to be secured from security paper.

Der Schritt der Laserbeschriftung erfolgt in einem beliebigen Stadium der Herstellung des Wertdokuments. So kann es sinnvoll sein, das Sicherheitspapier bereits nach der Herstellung in Rollenform mit einer entsprechenden Markierung zu versehen. Dies ist insbesondere der Fall, wenn das Sicherheitspapier in Endlosform mit einer Folienbeschichtung, wie einem beugungsoptisch wirksamen, beispielsweise streifenförmigen Sicherheitselement, versehen wird und dieses Sicherheitselement, wie oben beschrieben, mit einer erfindungsgemäßen Markierung versehen werden soll.The laser marking step takes place at any stage in the production of the value document. So it may be useful to provide the security paper after production in roll form with a corresponding mark. This is the case, in particular, when the security paper is provided in continuous form with a film coating, such as a diffraction-optically effective, for example, strip-shaped security element, and this security element is to be provided with a marking according to the invention as described above.

Vorzugsweise erfolgt der Schritt der Lasermarkierung jedoch als einer der letzten Arbeitsschritte bei der Herstellung des Wertdokuments. Werden die Wertdokumente beispielsweise in Form von bogenförmigen Mehrfachnutzen bedruckt, so kann die Lasermarkierung noch am Bogen oder bereits am geschnittenen, fertigen Wertdokument erfolgen. Letzteres ist insbesondere sinnvoll, wenn mittels der Lasermarkierung eine individuelle Information, wie eine Seriennummer, erzeugt werden soll:However, the step of laser marking is preferably carried out as one of the last working steps in the production of the value document. If the value documents are printed, for example, in the form of sheet-shaped multiple uses, the laser marking can still take place on the sheet or already on the cut, finished value document. The latter is particularly useful if individual information, such as a serial number, is to be generated by means of the laser marking:

Ein besonderer sicherheitstechnischer Vorteil der vorliegenden Erfindung ist darin zu sehen, dass der beschriebene Effekt nicht durch einfache Mittel nachgestellt werden kann. Der Einsatz von Lasern erfordert hohe Investitionen und tief greifendes technisches Know-how, welches über den für den Einsatz üblicher Druckmaschinen oder digitaler Druckeinrichtungen nötigen Wissensstand weit hinausgeht.A particular safety advantage of the present invention is the fact that the effect described can not be adjusted by simple means. The use of lasers requires high investments and in-depth technical know-how, which goes far beyond the level of knowledge required for the use of conventional printing presses or digital printing devices.

Ein weiterer Vorteil der Erfindung liegt darin, dass die Lasermarkierung in einer für Druckereien typischen Geschwindigkeit berührungslos vorgenommen werden kann. Insbesondere kann jedes Dokument individuell markiert werden, indem beispielsweise die Seriennummer oder ein anderes individualisierendes Merkmal als Sicherheitsmerkmal in das Wertdokument integriert wird.A further advantage of the invention is that the laser marking can be carried out without contact in a speed typical for printing companies. In particular, each document can be individually marked, for example, by integrating the serial number or another individualizing feature as a security feature in the value document.

Anhand der nachfolgenden Beispiele und ergänzenden Figuren werden die Vorteile der Erfindung erläutert. Die beschriebenen Einzelmerkmale und nachfolgend beschriebenen Ausführungsbeispiele sind für sich genommen, aber auch in Kombination erfinderisch. Die Beispiele stellen bevorzugte Ausführungsformen dar, auf die jedoch die Erfindung in keinerlei Weise beschränkt sein soll. Die in den Figuren gezeigten Proportionen entsprechen nicht den in der Realität vorliegenden Verhältnissen und dienen vornehmlich zur Verbesserung der Anschaulichkeit. Es zeigen:

Fig.1
ein erfindungsgemäßes Wertdokument,
Fig. 2
eine Ausschnittsvergrößerung des Bereichs A,
Fig. 3
einen Schnitt durch das erfindungsgemäße Wertdokument entlang der Linie B - B,
Fig. 4
einen Schnitt durch das erfindungsgemäße Wertdokument entlang der Linie C - C,
Fig. 5
einen Schnitt durch das erfindungsgemäße Wertdokument entlang der Linie D - D,
Fig. 6
einen alternativen Aufbau der Beschichtung,
Fig. 7
einen andere beispielhafte Beschichtung.
The advantages of the invention will be explained with reference to the following examples and additional figures. The individual features described and embodiments described below are taken in isolation, but also in combination inventive. The examples illustrate preferred embodiments, to which, however, the invention should not be limited in any way. The proportions shown in the figures do not correspond to the conditions present in reality and serve primarily to improve the clarity. Show it:
Fig.1
a value document according to the invention,
Fig. 2
a detail enlargement of the area A,
Fig. 3
a section through the value document according to the invention along the line B - B,
Fig. 4
a section through the value document according to the invention along the line C - C,
Fig. 5
a section through the value document according to the invention along the line D - D,
Fig. 6
an alternative structure of the coating,
Fig. 7
another exemplary coating.

Fig. 1 zeigt ein erfindungsgemäßes Wertdokument 1 in Form einer Banknote. Das Wertdokument 1 weist gemäß der Erfindung eine Markierung 2 in Form einer Ziffernfolge auf, die durch Einwirkung eines Laserstrahls erzeugt wurde und sich in den Randbereich der Banknote 1 hinein erstreckt. Fig. 1 shows a value document 1 according to the invention in the form of a banknote. The value document 1 according to the invention has a marking 2 in the form of a number sequence, which was generated by the action of a laser beam and extends into the edge region of the banknote 1.

Fig. 2 zeigt eine Ausschnittsvergrößerung des Bereichs A der Fig.1. In dieser Vergrößerung ist der erfindungswesentliche Übergang der Markierung 2 über den Grenzbereich zwischen Beschichtung 3 und Sicherheitspapier 4 hinweg innerhalb der dargestellten "4" deutlich zu erkennen. An der Grenze der beiden Bereiche (3, 4) läuft die Markierung 2 nahtlos und ohne Versatz weiter. Aufgrund der dunkleren Graustufe der Markierung im Bereich des Sicherheitspapiers 4, ist der Übergang deutlich sichtbar und erscheint mit perfekter Passerhaltigkeit, die für eine gedruckte Markierung so nicht erreichbar wäre. Fig. 2 shows an enlarged detail of the area A of Fig.1 , In this enlargement, the transition of the marking 2, which is essential to the invention, over the boundary region between the coating 3 and the security paper 4 within the illustrated "4" can be clearly seen. At the boundary of the two areas (3, 4), the marker 2 continues seamlessly and without offset. Due to the darker gray level of the marking in the area of the security paper 4, the transition is clearly visible and appears with perfect Passerhaltigkeit, which would be unavailable for a printed mark.

Die Fig. 3 zeigt einen Schnitt durch das Wertdokument 1 entlang der Linie B-B. In diesem Fall ist im Bereich der Markierung 2 eine Beschichtung 3 in Form eines Sicherheitselements 3 angeordnet, wobei das Sicherheitselement 3 aus einem Transferelement besteht. Das Transferelement ist mittels einer Kleberschicht 5 am Wertdokument 1 befestigt. Zwischen der Kleberschicht 5 und einer Kunststoffschicht 7, insbesondere Lackschicht 7, befindet sich eine Metallschicht 6.The Fig. 3 shows a section through the value document 1 along the line BB. In this case, a coating 3 in the form of a security element 3 is arranged in the region of the marking 2, the security element 3 consisting of a transfer element. The transfer element is attached to the value document 1 by means of an adhesive layer 5. Between the adhesive layer 5 and a plastic layer 7, in particular lacquer layer 7, there is a metal layer 6.

Fig. 4 zeigt einen Schnitt durch das Wertdokument 1 entlang der Linie C-C. Daran ist zu sehen, dass diese Metallschicht 6 im Bereich der Markierung 2 fehlt. Beim Beschriftungs- oder Markierungsvorgang mit dem Laser wird die Metallschicht 6 so verändert, dass sie nicht mehr länger sichtbar ist. Die Bezugsziffer 8 bezeichnet den mit der Laserstrahlung beaufschlagten Bereich. Fig. 4 shows a section through the value document 1 along the line CC. It can be seen that this metal layer 6 is missing in the region of the marking 2. In the labeling or marking process with the laser, the metal layer 6 is changed so that it is no longer visible. The reference numeral 8 denotes the area acted upon by the laser radiation.

Fig. 5 zeigt einen Schnitt durch das Wertdokument 1 entlang der Linie D-D. Es ist eine durch die Laserbeschriftung hervorgerufene Farbveränderung 9 im Sicherheitspapier (Substrat) 4 zu sehen, die Teil der zur Markierung gehörenden und in Aufsicht erkennbaren "8" ist. In diesem Beispiel ist eine "8" dargestellt mit einem Schwärzungsgrad, der einer dunklen Graustufe entspricht. Die Laserleistung muss dabei auf den gewünschten Schwärzungsgrad eingestellt werden. Fig. 5 shows a section through the value document 1 along the line DD. It is a caused by the laser marking color change 9 in the security paper (substrate) to see 4, which is part of the mark belonging to and recognizable in supervision "8". In this example, an "8" is shown with a black level corresponding to a dark gray level. The laser power must be adjusted to the desired degree of blackening.

Im Grenzbereich A ändert sich demnach das Erscheinungsbild bzw. die Darstellungsweise der Markierung 2. Denn im Bereich des Sicherheitselements 3 ist die Markierung 2 in Form von Aussparungen 8 in der Metallschicht 6 dargestellt, d.h. als Negativdarstellung, während die Markierung 2 außerhalb des Sicherheitselements 3 in Form von Farbveränderungen, d.h. als Positivdarstellung, vorliegt.Accordingly, the appearance or the representation of the marking 2 changes in the boundary region A. For in the region of the security element 3, the marking 2 is represented in the form of recesses 8 in the metal layer 6, ie as a negative representation, while the marking 2 outside the security element 3 in the form of color changes, ie as a positive representation exists.

Fig. 6 zeigt ein Sicherheitspapier (Substrat) 20, beispielsweise einer Banknote oder eines anderen Wertdokuments, auf dem eine Beschichtung 22 aus einem Farbgemisch aus zwei Gemischkomponenten 24 und 26 aufgebracht ist. Eine der Gemischkomponenten 24 ist für die Strahlung des nachfolgend zur Markierung verwendeten Infrarotlasers transparent, die andere Gemischkomponente 26 absorbiert die Laserstrahlung. Im Bereich 28 wurde die Markierungsschicht 22 mit dem Markierungslaser mit geeignet gewählten Laserparametern bestrahlt, um die absorbierende Gemischkomponente 26 durch die Einwirkung der Laserstrahlung zu entfernen, zu verändern oder zu deaktivieren. Fig. 6 shows a security paper (substrate) 20, such as a banknote or other value document, on which a coating 22 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. In region 28, 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.

Je nach verwendetem Material kann die absorbierende Gemischkomponente 26 beispielsweise gebleicht, verdampft, in ihren Reflexionseigenschaften verändert oder durch eine chemische Reaktion in ein Material mit anderen optischen Eigenschaften umgewandelt werden. Insgesamt werden durch die Bestrahlung die optischen Eigenschaften des Farbgemisches im Bereich 28 irreversibel verändert. Als mögliche Effekte kommen unter anderem eine Farbveränderung, die Erzeugung eines Farbumschlags, das Aufhellen einer Farbe, die Änderung der Kippfarbe eines Effektfarbengemisches oder die lokale Änderung der Polarisationseigenschaften oder der Lumineszenzeigenschaften der Beschichtung 22 infrage.For example, depending on the material used, 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. Overall, the optical properties of the color mixture in the region 28 are irreversibly changed by the irradiation. Possible effects include a color change, 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 coating 22.

Aufgrund der laserinduzierten Änderung der optischen Eigenschaften des Farbgemisches entstehen visuell erkennbare Kennzeichnungen in dem Wertdokument. Diese können sowohl durch die Form der bestrahlten und modifizierten Bereiche 28 der Markierungsschicht selbst gebildet sein, oder sich erst in Zusammenwirkung mit weiteren, beispielsweise informationshaltig strukturierten Druckschichten ergeben.Due to the laser-induced change in the optical properties of the color mixture, visually recognizable markings are created in the value document. These can be formed both by the shape of the irradiated and modified regions 28 of the marking layer itself, or arise only in cooperation with further, for example information-containing structured printed layers.

Beispielsweise kann zwischen dem Substrat 20 und der Beschichtung 22 eine informationsführende Druckschicht vorgesehen sein, und die Änderung der optischen Eigenschaften der Beschichtung 22 in der Erzeugung transparenter Teilbereiche 28 in einer ansonsten opaken Schicht bestehen, so dass die Informationen der Druckschicht in diesen Teilbereichen nach der Laserbestrahlung sichtbar sind.For example, an information-carrying printing layer may be provided between the substrate 20 and the coating 22, and the change in the optical properties of the coating 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.

Eine andere beispielhafte Beschichtung zeigt die Fig. 7. Dabei ist auf einem Substrat 30 eine Beschichtung 32 aufgebracht, die eine erste für die Laserstrahlung der gewählten Wellenlänge transparente Schicht 34, eine absorbierende Schicht 36 und eine zweite für die Laserstrahlung transparente Schicht 38 aufweist. Zumindest eine der absorbierenden oder transparenten Schichten enthält optisch variable Farbpigmente. Beispielsweise kann die transparente Schicht 34 Flüssigkristallpigmente enthalten, die eine mit dem Betrachtungswinkel veränderliche Reflexionsfarbe zeigen.Another exemplary coating shows the Fig. 7 , In this case, a coating 32 is applied to a substrate 30 which has a first transparent layer 34 for 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. For example, the transparent layer 34 may include liquid crystal pigments that exhibit a reflection-angle-changing reflection color.

Durch Laserbestrahlung ist die absorbierende Schicht 36 in einem Teilbereich 40 abgetragen, wobei die über der absorbierenden Schicht 36 liegende transparente Schicht 38 durch die Ablation mit dieser mitgerissen wurde. Wird zur Abtragung beispielsweise ein Infrarotlaser, etwa ein Nd:YAG-Laser mit λ=1,064 µm, verwendet, so können die für die Laserstrahlung transparenten Schichten 34, 38 im sichtbaren Spektralbereich opak und gefärbt sein. Durch die Form und Gestalt des abgetragenen Bereichs 40 lassen sich vielfältige Markierungen in die Beschichtung 32 einbringen, in denen beispielsweise ein optisch variabler Farbeffekt einer Flüssigkristallschicht 34 kontrastierend zu einem einfarbigen Umgebungsbereich einer zweiten transparenten Druckschicht 38 hervortritt.As a result of laser irradiation, 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. If, for example, an infrared laser, for example a Nd: YAG laser with λ = 1.064 μm, is used for the ablation, then the layers 34, 38 transparent to the laser radiation can be opaque and colored in the visible spectral range. By the shape and shape of the removed area 40 can bring a variety of markings into the coating 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 printed layer 38.

Bei all diesen Beispielen setzt sich der in den verschiedenen Beschichtungen erzeugte Teil der Markierung in Form einer Farb- und/oder Kontrastveränderung im umgebenden Substratmaterial fort.In all of these examples, the portion of the label produced in the various coatings proceeds in the form of a change in color and / or contrast in the surrounding substrate material.

Claims (17)

  1. A value document, such as bank note, passport or the like, having a security paper and a laser marking, the security paper having at least one partial area with a coating, characterized in that the laser marking extends over the border area between coating and security paper.
  2. The value document according to claim 1, characterized in that the coating has at least one metal layer.
  3. The value document according to claim 1 or 2, characterized in that the marking is present in the area of the coating in the form of gaps in the metal layer which run into a color change, in particular blackening, of the security paper in the border area with the security paper.
  4. The value document according to at least one of claims 1 to 3, characterized in that the coating has at least one plastic layer and one metal layer, the plastic layer having a diffraction structure.
  5. The value document according to at least one of claims 1 to 4, characterized in that the coating has an ink mixture having at least one mixture component absorbent to laser radiation and one mixture component transparent to laser radiation.
  6. The value document according to at least one of claims 1 to 5, characterized in that the coating is of multilayer design and at least one of the layers has the marking.
  7. The value document according to at least one of claims 1 to 6, characterized in that the coating has two layers disposed one over the other, a first layer being transparent to laser radiation and the second layer absorbing laser radiation.
  8. The value document according to at least one of claims 1 to 7, characterized in that the coating has optically variable properties.
  9. The value document according to at least one of claims 1 to 8, characterized in that the coating contains liquid crystalline pigments and/or contains interference layer pigments.
  10. The value document according to at least one of claims 1 to 9, characterized in that the marking is present in the form of alphanumeric characters, bar codes, patterns, graphics or microwriting.
  11. The value document according to at least one of claims 1 to 10, characterized in that a plurality of markings are present on the value document.
  12. A security paper for value documents, such as bank notes, identity cards or the like, which has a laser marking, the security paper being provided with a coating in at least one partial area, characterized in that the laser marking extends over the border area between coating and security paper.
  13. The value document or security paper according to at least one of claims 1 to 12, characterized in that the value document or security paper is of multilayer design.
  14. A method for producing a marking in a value document, such as a bank note or the like, which has a security paper provided with a coating at least in one partial area, the value document being exposed to laser radiation, characterized in that the laser beam is guided over the border area between coating and security paper, and the laser parameters are selected so as to produce a laser marking which is present both in the area of the coating and in the area of the security paper and extends over the border area.
  15. A method for producing a marking in a security paper for value documents, such as bank notes or the like, with at least one partial area having a coating, the security paper being exposed to laser radiation, characterized in that the laser beam is guided over the border area between coating and security paper, and the laser parameters are selected so as to produce a laser marking which is present both in the area of the coating and in the area of the security paper and extends over the border area.
  16. The method according to claim 14 or 15, characterized in that a Nd:YAG laser is used.
  17. The method according to at least one of claims 14 to 16, characterized in that inscription is done with the laser at a high speed usual for security printing plants.
EP05739640A 2004-05-05 2005-05-02 Security document Revoked EP1744899B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05739640T PL1744899T3 (en) 2004-05-05 2005-05-02 Security document

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004022081 2004-05-05
DE200410027306 DE102004027306A1 (en) 2004-06-04 2004-06-04 Security document, e.g. banknote or passport, uses security paper with coated sub-section(s) and are marked with laser so that mark extends over boundary between coating and paper
PCT/EP2005/004741 WO2005108109A1 (en) 2004-05-05 2005-05-02 Security document

Publications (2)

Publication Number Publication Date
EP1744899A1 EP1744899A1 (en) 2007-01-24
EP1744899B1 true EP1744899B1 (en) 2013-01-23

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EP05739640A Revoked EP1744899B1 (en) 2004-05-05 2005-05-02 Security document

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US (1) US8622433B2 (en)
EP (1) EP1744899B1 (en)
CA (1) CA2565479C (en)
PL (1) PL1744899T3 (en)
RU (1) RU2381906C2 (en)
WO (1) WO2005108109A1 (en)

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Also Published As

Publication number Publication date
RU2381906C2 (en) 2010-02-20
WO2005108109A1 (en) 2005-11-17
US20080191462A1 (en) 2008-08-14
PL1744899T3 (en) 2013-06-28
CA2565479C (en) 2013-11-12
RU2006142736A (en) 2008-07-27
CA2565479A1 (en) 2005-11-17
EP1744899A1 (en) 2007-01-24
US8622433B2 (en) 2014-01-07

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