EP2941355A1 - Procédé de réalisation d'un élément de sécurité comprenant une couche d'enregistrement sensible au rayonnement laser - Google Patents

Procédé de réalisation d'un élément de sécurité comprenant une couche d'enregistrement sensible au rayonnement laser

Info

Publication number
EP2941355A1
EP2941355A1 EP13792594.7A EP13792594A EP2941355A1 EP 2941355 A1 EP2941355 A1 EP 2941355A1 EP 13792594 A EP13792594 A EP 13792594A EP 2941355 A1 EP2941355 A1 EP 2941355A1
Authority
EP
European Patent Office
Prior art keywords
laser
recording layer
sensitive recording
appearance
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13792594.7A
Other languages
German (de)
English (en)
Other versions
EP2941355B1 (fr
Inventor
Harald Reiner
Daniela Otto
Georg Depta
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
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to PL13792594T priority Critical patent/PL2941355T3/pl
Publication of EP2941355A1 publication Critical patent/EP2941355A1/fr
Application granted granted Critical
Publication of EP2941355B1 publication Critical patent/EP2941355B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—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
    • B42D25/425—Marking by deformation, e.g. embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D2033/14—
    • B42D2033/20—
    • B42D2035/14—
    • B42D2035/16—
    • B42D2035/24—
    • B42D2035/26—
    • B42D2035/34—
    • B42D2035/50—
    • 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
    • B42D25/324—Reliefs
    • 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
    • B42D25/391—Special inks absorbing or reflecting polarised light

Definitions

  • the invention relates to a method for producing a security element for security papers, value documents and other data carriers.
  • the invention also relates to a security element, which is produced by such a method, a data carrier, in particular a security paper or valuable article, with such a security element and a device for carrying out said method.
  • Identity cards such as credit cards or identity cards
  • have long been personalized by laser engraving for example, provided with a passport photo or other personal information.
  • To personalize a badge by laser engraving usually the optical properties of the substrate material of the card are irreversibly changed by suitable guidance of a laser beam in the form of a desired marking, in particular blackened. Based on this, the present invention seeks to provide an advantageous method for producing a security element of the type mentioned.
  • a substrate is at least partially provided with a laser-sensitive recording layer which has a visual output appearance, and which consists of a color mixture having at least one laser-absorbing mixture component, the laser-sensitive recording layer is acted upon in a first portion with a first laser radiation with first laser parameters,
  • the laser-sensitive recording layer is applied in a second portion with a second laser radiation with second, different laser parameters, there compared to the initial appearance changed and from the first target Appearance image to produce distinctive second target appearance, wherein the first and second laser radiation are generated with only one laser source and only one imaging optics, and the first and second Partbere I thereby be generated in Passer to each other.
  • the different laser parameters of the first and second laser radiation may in particular consist of a variation of the intensity, the energy and / or the pulse peak power of the laser radiation.
  • the intensity of the laser radiation can be set above all by focusing the laser beam, the energy of the laser radiation primarily by the marking speed and the diode current of a diode pump laser and the pulse peak power first by selecting pulse mode or continuous wave mode and pulse mode by the pulse length.
  • the laser source is preferably ten designs for generating the first target appearance in pulse mode and for generating the second target appearance in continuous wave mode operated.
  • first and second are not intended to indicate an order or a ranking, but are intended to refer to only two distinct portions, laser parameters and appearances.
  • the laser source is advantageously provided in the context of the invention with a Q-switch, which allows in a conventional manner the generation of pulses with high peak power.
  • the opening time of the Q-switch determines the pulse character of the laser radiation.
  • a continuously open Q-switch a continuous wave laser beam is emitted, and periodic opening and closing of the Q-switch produces pulsed laser radiation.
  • a short opening time of the Q-switch results in short laser pulses with pulse durations of preferably 20 ns or less, from 10 ns to 20 ns, or even 10 ns or less.
  • Such short pulses have a very high power. With their short exposure time, they are particularly suitable for ablation of the absorbent mixture component from the applied recording layer.
  • An average opening time of the Q-switch leads to longer pulses with pulse durations from a few hundred nanoseconds to a few microseconds and correspondingly lower power. With these pulses, thermal effects increasingly come to the fore with increasing pulse duration. Finally, with continuous wave operation of the laser source, the Q-switch is always open. The power of the laser beam is the lowest and due to the long exposure time the thermal effects dominate. As a result of the generation according to the invention of the partial regions, the first and second partial regions are in register with one another, so that two different but mutually aligned modification regions can be produced in the recording layer.
  • a partial area may form a frame for the second partial area, or the partial areas may be supplemented to form an overall motif.
  • register fluctuations of the two subregions which are often unavoidable in the production in separate steps, are particularly noticeable.
  • the procedure according to the invention makes it possible to avoid such register fluctuations since the different appearances with the same laser source are produced in only one operation only by the use of different operating modes of the same laser source.
  • Another important aspect of the invention is that the different appearances are produced in the same recording layer and not caused by the different responses of different recording layers to the laser application.
  • the portions created by the laser application together form a visually recognizable mark in the recording layer and the security element.
  • the marking may, for example, consist in the numbering while replacing or supplementing letterpress numbering, for example on banknotes. It may also consist of numbers and / or letters, which may be derived in particular from the cited number. For example, the numbers or letters may be obtained from a digit by cryptographic methods, or they may consist of only one repetition of a portion of the number.
  • the marker may also be a value number, such as a banknote, a logo, such as a publisher logo of a central bank, a date or time or an indication derived therefrom, or even a graphical element or a code such as bar code, matrix code or multi-color code.
  • the security element in particular carrier materials made of cotton fibers, polymers or a substrate with a hybrid structure in question.
  • the security element can be part of a data carrier that provides the substrate, or can be applied with its substrate to a data carrier.
  • the laser-sensitive recording layer can be applied over the entire area, but at present it is preferred that the laser-sensitive recording layer is applied in the form of a grid, in particular in the form of a line, dot or cross grid.
  • the dimensions of the raster forming raster elements and the distances of the raster elements are advantageously below the resolution limit of the naked eye, in particular below 200 ⁇ , so that the recording layer appears completely flat when viewed without tools.
  • the laser-sensitive recording layer is formed by a printing layer, preferably a monochrome printing layer.
  • all printing processes in particular screen printing, intaglio printing, background printing, offset printing, gravure printing or letterpress printing, come into consideration.
  • the initial appearance of the laser-sensitive recording layer in a homogeneous color impression, for example in the monochrome impression of a closely screened printing layer.
  • the recording layer may contain only a single laser-sensitive mixture component derived from the first and second Laser radiation is influenced due to the different laser parameters in different ways or even in different strength and thereby generates the different target appearances.
  • first laser parameter by pulsed laser application with short laser pulses of about 10 ns (first laser parameter), only the absorbing mixture component can be removed from the recording layer, while the entire recording layer is removed by laser application in continuous wave mode (second laser parameter).
  • second laser parameter laser parameter
  • the color mixture of the recording layer can also contain a plurality of laser-sensitive mixture components, wherein, for example, a first component is influenced essentially only by the first laser radiation, and a second component is influenced essentially only by the second laser radiation, so that different target appearances result.
  • the recording layer may be broadband absorptive, but currently recording layers having IR absorbing components are preferred.
  • the color mixture of the laser-sensitive recording layer contains optically variable color pigments, non-absorbing mixture components being in particular optically variable liquid crystal pigments or a transparent intaglio and for the laser-absorbing mixture components, for example optically variable interference layer pigments.
  • Other irreversible color components which are irreversible 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 laser-absorbing mixture components.
  • the color mixture of the laser-sensitive on drawing layer as a laser-absorbing mixture component contains carbon black.
  • weight fraction of carbon black of 10% to 30%, preferably of 15% to 30%, has proven to be particularly advantageous.
  • the carbon black content is advantageously above 3%, in particular above 6%.
  • the laser-sensitive recording layer is completely removed by the first or second laser radiation, and the first target appearance or the second target appearance consists in the appearance of the substrate.
  • the substrate is an uncoated paper substrate, for example, the first or second target appearance is the paper white of the paper substrate, but the use of other substrates or coated substrates may also result in a different first or second target appearance.
  • At least one laser-absorbing mixture component is at least partially removed from the laser-sensitive recording layer by the first or second laser radiation, and the first target appearance or second target appearance consists in particular in a lightening of the homogeneous color impression of the laser-sensitive recording layer.
  • different proportions of the laser-absorbing mixture components can be removed and thus different effects, in particular different degrees of brightening, can be produced. Different strong effects or brightening can be combined in a single drawing layer.
  • the laser radiation in a further sub-range only to the smallest amounts of the absorbent mixture component remove so that the visual color impression is substantially retained there.
  • a laser-absorbent blend component may be bleached, vaporized, altered in reflectivity, or converted to a material having other optical properties. All these modifications are summarized in this description under the term "removal of the laser-absorbing mixture component" since the laser-absorbing mixture component is no longer in its original form as a laser-absorbing component after its modification , the generation of a color change, the lightening of a color, the change of the tipping color of an effect color mixture or the local change of the polarization properties or the luminescence properties of the drawing layer in question.
  • laser exposure in pulsed mode with short laser pulses of about 10 ns to 20 ns removes at least one absorbing mixture component at least partially from the color mixture of the recording layer and becomes the continuous laser mode by second laser exposure entire recording layer removed.
  • first laser parameter removes at least one absorbing mixture component at least partially from the color mixture of the recording layer and becomes the continuous laser mode by second laser exposure entire recording layer removed.
  • the surface properties of the color mixture can also be changed.
  • the two variants of complete removal of the laser-sensitive recording layer and the removal of the absorbent mixture components from the same recording layer enable the generation of visually attractive, perfectly matched modification regions in the recording layer using only one laser source.
  • the design variety can be further increased and even extended by tactile elements.
  • the substrate when a raster-shaped recording layer is used, provision may be made for the substrate to be blackened and / or foamed by the first or second laser radiation in intermediate spaces between the raster elements of the laser-sensitive recording layer.
  • the substrate can be provided only in regions with the laser-sensitive on drawing layer.
  • the substrate in an outer region of the recording layer can then also be exposed to the first or second laser radiation, and the substrate can be blackened and / or foamed in the exposed outer region by the action of the laser radiation. Since the recording layer and the exterior are subjected to the same laser source, the blackening or foaming of the substrate can be performed in register with the above-described modification regions of the recording layer. For example, a partial area may form a motif in the recording layer, which continues without register fluctuations in the adjacent outer area of the substrate.
  • the laser-sensitive recording layer is exposed to laser radiation with different laser parameters even in three or more subregions in order to produce different target appearances which are different from the original appearance, the laser radiation for applying the three or more subregions with only one Laser source and only one imaging optics is generated.
  • the transitions between the first and second and possibly further subregions can be erratic or fluid.
  • the laser parameters can be varied along ramps along with the duration of the marking.
  • the change can not only be linear, but also formed with other, even unsteady, functions to produce nonlinear changes and jumps in the laser parameters.
  • the opening time of the Q-switch during the generation of a line-shaped mark can be extended continuously until finally continuous wave operation is achieved.
  • a distinctly colored line in which initially only soot particles are removed from the color mixture, slowly become brighter, until finally only the substrate color is visible. It is understood that multiple ramps for different laser parameters can run simultaneously.
  • the applied subregions can also overlap.
  • the order of exposure to different laser parameters can decide the appearance ultimately produced since absorbing mixture components are no longer available after their removal for subsequent laser modification.
  • a visually appealing appearance of the security element is associated with high security against counterfeiting, for which purpose the first and / or second partial area is first subjected to pulsed laser radiation.
  • marking spots are generated in the laser-sensitive recording layer at least in one of the exposures to laser radiation in the pulse mode by the individual laser pulses, which can be visually separated from each other.
  • spatially inhomogeneous marking spots having a substantially circular and / or annular appearance are produced at least in one of the exposures to laser radiation in pulsed operation, the edges of the marking spots in particular appearing clearly.
  • the marking spots are advantageously produced overlappingly, at least in partial areas, so that the overlapping direction of the marking spots indicates the order and direction of the application of the laser pulses.
  • the sizes of the marker patches are between 10 ⁇ and 1 mm, preferably between 50 ⁇ and 500 ⁇ .
  • the laser application is advantageously carried out with an infrared laser in the wavelength range from 0.8 ⁇ to 3 ⁇ , in particular a Nd: Y AG laser or a Nd: YV0 4 laser.
  • the pulse duration is preferably shorter than usual with marking lasers and is advantageously between 5 ns and 25 ns, in particular between 5 ns and 15 ns.
  • the invention also includes a security element for securing security papers, documents of value and other data carriers, which is produced by the method described above.
  • the security element contains a substrate which is provided, at least in regions, with a laser-sensitive recording layer which has a visual output appearance and which consists of a color mixture comprising at least one laser-absorbing mixture component, in a first subregion of the laser-sensitive recording layer by the action of a first laser radiation
  • a first target appearance modified compared to the initial appearance is generated, in a second subarea of the laser-sensitive recording layer by the action of a second laser radiation with second, different laser parameters a change from the initial appearance and from the first target appearance distinctive, second target appearance is generated, and the first and second sub-area are in the register to each other.
  • the substrate is provided only in regions with the laser-sensitive recording layer, and the substrate is blackened and / or foamed in an outer region of the recording layer by the action of laser radiation in the register with the first and / or second portion.
  • the laser-sensitive recording layer can be applied over the entire area, or is preferably grid-shaped, in particular in the form of a line, dot or cross grid.
  • the laser-sensitive recording layer is advantageously formed by a printing layer, preferably a monochrome printing layer.
  • the laser-sensitive recording layer in the first and / or second partial area has a multiplicity of marking spots generated by individual laser pulses, which can be visually separated from one another.
  • the marking patches are preferably formed inhomogeneously inhomogeneous with a substantially circular and / or annular appearance, wherein in particular the edges of the marking patches clearly appear.
  • the marker patches may overlap at least in subregions, the overlap direction of the marker patches indicating the order and direction of exposure to the laser pulses.
  • a polymer substrate or a composite substrate is particularly suitable, the latter preferably having a layer sequence foil / paper / foil or paper / foil / paper.
  • Such composite substrates are also often referred to as hybrid substrates.
  • the laser-sensitive recording layer is advantageously formed by an offset printing layer.
  • the invention further comprises a data carrier with aitessele- ment of the type described.
  • the security element may be part of the data carrier by this provides the substrate of the security element, or the security element may be applied with its substrate on a separate disk.
  • the data carrier may in particular be a banknote, in particular a paper banknote, preferably a cotton paper banknote, a polymer banknote or a foil-paper composite banknote. The latter preferably has a layer sequence foil / paper / foil or paper / foil / paper.
  • the data carrier can also be an identification card, in particular a credit card, a Bank card, cash card, authorization card, identity card, passport or passport personalization page.
  • the invention also includes an apparatus for carrying out the described method, with
  • Means for applying a laser-sensitive recording layer to a substrate a laser source which can be operated with different laser parameters, in particular both in continuous wave mode and in pulse mode, scanning optics for applying laser radiation of the laser source to the laser-sensitive recording layer, and a control device for Driving the laser source and the scanning optics to apply the laser-sensitive recording layer with laser radiation of the laser source with different laser parameters, in particular both with laser radiation of the laser source in continuous wave mode and with laser radiation of the laser source in the pulse mode.
  • the laser source is preferably an infrared laser in the wavelength range from 0.8 ⁇ to 3 ⁇ , in particular a Nd: Y AG laser or Nd: YV0 4 - laser.
  • the laser source is advantageously provided with a Q-switch, which enables the generation of laser pulses with high peak power. Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation in terms of scale and proportions has been dispensed with in order to increase the clarity.
  • FIG. 1 is a schematic representation of a banknote with a security element according to the invention
  • FIG. 1 shows a schematic cross-sectional view of the security element of FIG. 1, a schematic representation of a laser inscription to explain its operating principle when carrying out a method according to the invention
  • FIGS. 4 and 5 show two ways of modifying the laser-sensitive recording layer by laser application, wherein (a) shows in each case a plan view of a security element with a substrate and a laser-sensitive printing layer in the form of a line grid with parallel printing lines, and (b) respectively a cross section of FIG FIGS.
  • 6 and 7 show two further possibilities for modifying the laser-sensitive recording layer and the substrate by laser application, in which (a) in each case a plan view of a security element with a substrate and a laser-sensitive printing layer in the form of a line grid with parallel printing lines (b) shows in each case a cross section of the security element along the line BB, that is, along one of the printing lines of (a), and (c) shows a cross section along the line CC of (a), which is shown in FIG - gap between two lines of pressure, and
  • FIG. 8 shows in (a) a plan view of a composite substrate with a laser-sensitive offset ink layer, which is provided by pulsed laser radiation with a multiplicity of overlapping marking spots, and in (b) a security element with a more complex motif (digit "7"). ), with a plurality of marking spots arranged along the outline of the motif, and a completely removed inner area.
  • Fig. 1 shows a schematic representation of a banknote 10, which is provided with a security element 12 according to the invention.
  • a motif is generated with a plurality of mutually standing in the register subregions, each with a different visual appearance.
  • the security element 12 shows a motif with a dark blue background 14, with a paper-white appearing letter sequence 16, which is shown in the figure only by the letter "A” and with a light blue appearing ornamental line pattern 18, which stands in the perfect register for the letter sequence 16 ,
  • Fig. 2 shows the security element 12 of Fig. 1 schematically in cross section.
  • a laser-sensitive on drawing layer is applied, which consists in the embodiment of a monochrome, dark blue print layer 22 of a laser-sensitive ink.
  • the print layer 22 consists of a color mixture which has at least one mixture component 23 which absorbs the radiation of the laser source used for marking, and which further comprises non-absorbing color components 25.
  • the printing layer 22 is applied in the form of a line grid with parallel printing lines 24 having a width of about 100 ⁇ m and a center-to-center distance of about 150 ⁇ m, so that the visual impression of a homogeneous dark blue surface arises when viewed without auxiliary means.
  • the cross-section of FIG. 2 runs along one of the printing lines 24 of the line screen, so that the locking of the printing layer in the illustration of FIG. 2 is not visible.
  • the printing ink used can be broadband absorbent, preferably a printing ink with IR-absorbing components is used.
  • the print layer 22 was then subjected to a first laser radiation in the continuous wave mode in such a selected laser parameters in a first portion 26, which forms with its shape the letter sequence 16 shown in Fig. 1, that the print layer 22 was completely removed in the portion 26, without while changing the substrate 20 itself.
  • a first target appearance which is modified compared to the dark blue initial appearance, is visible, which is formed by the paper-white appearance of the banknote paper 20.
  • the print layer 22 has a second Laser radiation in pulsed operation at such selected laser parameters acted upon that only the laser-absorbing mixture component 23 was removed from the print layer 22, the non-absorbing ink constituents 25, however, remain in the print layer 22.
  • the laser-absorbing mixture component 23 can be bleached, vaporized, changed in its reflection properties, or converted into a material having different optical properties.
  • the substrate 20 is not changed even by the laser application.
  • the laser-absorbing mixture component 23 is completely removed in the second partial region 28 for the sake of clarity. In practice, however, the laser-absorbing mixture component 23 is usually only partially, for example 5% to 95% removed.
  • the printing layer 22 is not completely removed in the partial region 26, but only partially, eg to 40% to 99%.
  • the security element 12 thus contains a motif with a dark blue background 14 (initial appearance) and a a paper-white appearing letter sequence 16 (first target appearance), which is passer exactly surrounded by a light blue line ornament 18 (second target appearance).
  • a particular advantage of the method according to the invention is that different and perfectly matched visual appearances can be produced by the combination of different laser marking parameters, in particular continuous and pulsed laser radiation of a single laser source, even in a monochromatic recording layer.
  • the manufacturing method will now be explained in more detail with reference to FIG. 3, which schematically shows a laser marker 30 according to the invention.
  • the laser marker 30 contains a laser source 32, for example a Nd: YV0 laser with a wavelength of 1064 nm, which can be operated with the aid of a Q-switch both in continuous wave mode (cw) and in pulse mode.
  • a Q-switch both in continuous wave mode (cw) and in pulse mode.
  • the opening time of the Q-switch within the period can be set freely.
  • a control unit 34 is provided for controlling the laser source 32, including the choice of operating mode (continuous wave / pulsed) and the other desired laser parameters.
  • the laser beam 36 emitted by the laser source 32 is deflected by two movable mirrors 38, one of the mirrors producing the deflection in the x direction, the other mirror producing the deflection in the y direction.
  • a plan field lens 40 focuses the laser beam 36 at the desired portion of the security element 12 of a banknote benefit where it modifies the initial appearance of the print layer 22 or an adjacent substrate area as described.
  • the energy or power input into the Printing layer 22 or the substrate 20 can be influenced not only by the operating mode of the laser and by the energy or power of the laser radiation, but also by the scanning speed of the laser beam 36, which can also be selected with the aid of the control device 34.
  • the surface intensity of the radiation can be adjusted by an optical system, for example a focus shifter 42, which determines the beam diameter of the laser radiation impinging on the security element 12, and which can likewise be controlled by the control unit 34. In this way, different line widths and different laser beam intensities can be realized.
  • an optical system for example a focus shifter 42, which determines the beam diameter of the laser radiation impinging on the security element 12, and which can likewise be controlled by the control unit 34.
  • the first subarea 26 for example, with a continuous wave laser radiation of an Nd: YV0 4 laser at a power between 75 W and 105 W and a scan speed between 2 m / see s and 7 m / s are worked.
  • the second subregion 28 it is possible to operate with 10 ns to 20 ns pulses at a pulse frequency of 30 kHz with a charging time of 5 ⁇ / ⁇ and a scanning speed of approximately 4 m / s in pulse mode.
  • Fig. 3 illustratively shows a security element of only one banknote benefit
  • a banknote sheet is typically processed with a plurality of banknote benefits, with multiple laser sources capable of processing one benefit in parallel, and with each laser source sequentially utilizing multiple uses of the signature in accordance with the described method processed.
  • Each benefit is processed but only by a laser source and acted upon by this with laser radiation with different laser parameters, in particular with both continuous and pulsed laser radiation.
  • there are also other possibilities including the substrate of the security element which are now related to the possibilities already described to be explained on the figures 4 to 7.
  • FIG. 4 (a) shows a plan view of a security element 50 having a substrate 52 and a monochrome laser-sensitive print layer 22 formed in the form of a line grid with parallel print lines 24 and spaces 24 '.
  • the print layer 22 consists of a color mixture with laser-absorbing mixture components 23 and with non-absorbing color components 25.
  • FIG. 4 (b) shows a cross-section of the security element 50 along the line BB, ie along one of the print lines 24 of FIG. 4 (a).
  • the printing lines 24 are not drawn to scale in the figure and typically have a width of about 100 ⁇ and a center-to-center distance of about 150 ⁇ in order to produce a print layer, which gives a homogeneous color impression when viewed without aids.
  • the printing layer 22 with the printing lines 24 was applied in a partial region 54, in the embodiment in the form of the letter "A", with laser radiation of the laser source 32 in continuous wave mode and with laser parameters selected in such a way that the printed layer 22 in the partial region 54 was completely removed, without
  • the security element 50 exhibits in the partial area 54 a changed appearance compared to the homogeneous color impression of the print layer 22, which is given by the appearance of the substrate 52. If the substrate 52 is an uncoated paper substrate, as in the exemplary embodiment of FIG 2, the partial area 54 appears paper-white; using other or coated substrates may also result in a different visual impression.
  • Fig. 5 (a) also shows a plan view of a security element 50 having a substrate 52 and the monochrome laser-sensitive print layer 22 of Fig. 4 (a), and Fig. 5 (b) shows a cross-section along the line BB, that is, along one the printing lines 24 of Fig. 5 (a).
  • the printing layer 22 with the printing lines 24 was acted upon in a partial region 56, in the exemplary embodiment in the form of the letter "B", with laser radiation of the laser source 32 in pulse mode at such selected laser parameters that in the sub-area 56, the laser-absorbing mixture component 23 partially from
  • the print layer 22 has been removed, but the non-absorbing color components 25 remain completely in the print layer 22 without changing the substrate 52 in the gaps 24 'between the print lines 24.
  • the security element 50 therefore faces the initial appearance a lightening, for example, a homogeneous light blue color impression.
  • FIG. 6 shows a further modification possibility, which also detects the substrate 52 in addition to the printing layer 22.
  • Fig. 6 (a) the edge portion between the print layer 22 and the adjacent outer portion 60 outside the print layer 22 is shown.
  • FIG. 6 (b) shows a cross-section of the security element 50 along the line BB of (a) along one of the pressure lines 24 and Fig. 6 (c) shows a cross-section along the line CC of (a), which is in a gap 24 ' between two lines of pressure 24 runs.
  • the laser-modified subregion is not extended in a planar manner, unlike in the exemplary embodiments of FIGS. 4 and 5, but consists in the outline shape of the letter "C".
  • For marking pulsed laser radiation of the laser source 32 is used with medium pulse peak power, for example, with an opening time of the Q-switch of 5 ⁇ 8 at 50 kHz pulse frequency, a medium intensity, generated for example by a beam width of 0.6 mm and a mean line energy, for example generated by a marking speed of 6 m / s.
  • medium pulse peak power for example, with an opening time of the Q-switch of 5 ⁇ 8 at 50 kHz pulse frequency
  • a medium intensity generated for example by a beam width of 0.6 mm
  • a mean line energy for example generated by a marking speed of 6 m / s.
  • Blackening 62 of the substrate As illustrated in Fig. 6 (c), the same blackening effect results in the gaps 24 'between the printing lines 24 where the laser radiation also strikes the substrate directly.
  • the appearance of the left half of the letter "C” in the area of the print layer 22 results from a superposition of the alternating brightenings 58 of the printing lines 24 and the blackened lines Areas 62 in the spaces 24 '.
  • the brightening 58 and the blackened areas 62 are not separately recognizable with the naked eye, but complement each other for the viewer to a homogeneous overall impression. Due to the additionally present blackened regions 62, the target appearance of the print layer 22 in this variant is darker than in the case of the pure brightening of the print layer 22 described in conjunction with FIG. 5.
  • FIG. 7 also includes the substrate 52.
  • FIG. 7 (a) shows a plan view of FIG Edge region of print layer 22 and outer region 60
  • Fig. 7 (b) shows a cross section of the security element 50 along the line BB of (a) along one of the printing lines 24
  • Fig. 7 (c) shows a cross section along the line CC of (a ) in a gap 24 'between two printing lines 24.
  • the laser-modified portion is in the embodiment of FIG. 7 in the outline of the letter "D".
  • higher pulse peak power is used sets, for example, with an opening time of the Qüteschalters of 3 ⁇ at 30 kHz pulse frequency, a higher intensity, for example, generated by a beam width of 0 , 4 mm and a higher line energy, for example generated by a marking speed of 3 m / s.
  • the action of the laser radiation at the selected laser parameters results in blackening and in addition to a foaming 64 of the substrate. This effect results both in the area of the intermediate spaces 24 ', as shown in FIG. 7 (c), and in the area of the printing lines 24, which are completely removed by the laser radiation and where, in addition, the underlying substrate is blackened and foamed.
  • a blackened and foamed region 64 in the form of the letter "D" results, which equally covers the area of the print layer 22 and the outer area 60 and which, in addition to the visual impression of the blackening by the foaming surface of the substrate, can also be tactually detected Authenticating feature.
  • the action of the laser radiation in the printing layer 22 only leads to a whitening 58, while in the outer region 60 a blackened and foamed region 64 is formed.
  • FIG. 8 (a) shows, to illustrate the underlying principle, a plan view of a composite substrate 70 which carries a laser-sensitive recording layer having a color layer 72 applied in an offset process whose carbon black content in the exemplary embodiment is about 25%.
  • the color layer 72 was exposed to laser radiation in pulsed operation, wherein each laser pulse generated by the interaction with the soot-containing ink layer a marking patch 74.
  • the marker patches 74 are spatially inhomogeneous and show a substantially annular appearance. In particular, the edges 76 of the marking patches appear clearly without the realization of this effect being understood in detail so far.
  • the individual marking spots 74 overlap, but because of the protruding edges 76, they can easily be visually separated from one another when viewed with a magnifying glass or the like.
  • the patch patches may also change the order and the direction 78 is closed in which the marker patches 74 have been sequentially generated.
  • FIG. 8 (b) shows, as a more complex motif 80 of a security element, the number "7", which may for example be part of a serial number inscribed in the recording layer 72 of FIG. 8 (a) by laser radiation.
  • a plurality of marking spots 74 which are arranged along the outline of the motif 80, were first of all generated in a first partial region 82 with laser radiation in pulsed operation with first laser parameters. Subsequently, the drawing layer 72 in the inner region of the motif (second subarea 84) was completely removed with second laser parameters, without, however, changing the substrate 70 itself.
  • the security element provided with the motif 80 also has an increased security against forgery, since the sequence, the direction and the distance Marking marks 74 are encoded in the security element additional information that are difficult to reproduce for a potential counterfeiter. LIST OF REFERENCE NUMBERS

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Abstract

L'invention concerne un procédé de réalisation d'un élément de sécurité (12) destiné à des papiers de sécurité, des documents de valeur et d'autres supports de données, selon lequel - on dote un substrat (20) au moins par endroits d'une couche d'enregistrement (22) sensible au rayonnement laser qui présente un aspect visuel initial et qui se compose d'un mélange de couleurs comportant au moins une composante qui absorbe le rayonnement laser, - dans une première zone partielle (26), on applique à la couche d'enregistrement (22) sensible au rayonnement laser un premier rayonnement laser ayant des premiers paramètres laser afin de créer dans ladite couche un premier aspect cible modifié par rapport à l'aspect initial, - dans une deuxième zone partielle (28), on applique à la couche d'enregistrement (22) sensible au rayonnement laser un deuxième rayonnement laser ayant des deuxièmes paramètres laser différents afin de créer dans ladite couche un deuxième aspect cible modifié par rapport à l'aspect initial et différent du premier aspect cible. Le premier et le deuxième rayonnement laser sont générés au moyen d'une seule source laser (32) et d'une seule optique de reproduction et la première et la deuxième zone partielle (26, 28) sont ainsi réalisées en registre l'une avec l'autre.
EP13792594.7A 2013-01-04 2013-11-13 Procédé de réalisation d'un élément de sécurité comprenant une couche d'enregistrement sensible au rayonnement laser Active EP2941355B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13792594T PL2941355T3 (pl) 2013-01-04 2013-11-13 Sposób wytwarzania elementu zabezpieczającego z laseroczułą warstwą zapisu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013000152.8A DE102013000152A1 (de) 2013-01-04 2013-01-04 Verfahren zum Herstellen eines Sicherheitselements mit einer lasersensitiven Aufzeichnungsschicht
PCT/EP2013/003417 WO2014106517A1 (fr) 2013-01-04 2013-11-13 Procédé de réalisation d'un élément de sécurité comprenant une couche d'enregistrement sensible au rayonnement laser

Publications (2)

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EP2941355A1 true EP2941355A1 (fr) 2015-11-11
EP2941355B1 EP2941355B1 (fr) 2017-09-06

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EP (1) EP2941355B1 (fr)
DE (1) DE102013000152A1 (fr)
PL (1) PL2941355T3 (fr)
WO (1) WO2014106517A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102014018512A1 (de) 2014-12-12 2016-06-16 Giesecke & Devrient Gmbh Optisch variables Sicherheitselement
DE102016006929A1 (de) * 2016-06-06 2017-12-07 Giesecke+Devrient Currency Technology Gmbh Sicherheitsmerkmal und Verfahren zu dessen Herstellung
DE102017006949A1 (de) 2017-07-21 2019-01-24 Giesecke+Devrient Currency Technology Gmbh Sicherheitselement mit optisch variabler Prägestruktur
DE102018005990A1 (de) * 2018-07-27 2020-01-30 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Herstellung eines Sicherheitsmerkmals mittels Laserstrahlung
DE102020111140A1 (de) * 2020-04-23 2021-10-28 Bundesdruckerei Gmbh Verfahren zum Markieren mittels Laserpulsen
DE102021104367A1 (de) 2021-02-24 2022-08-25 Bundesdruckerei Gmbh Verfahren und Vorrichtung zum Einbringen eines gelaserten Sicherheitsmerkmals
DE102021121813A1 (de) 2021-08-23 2023-02-23 Mühlbauer ID Services GmbH Verfahren zum Herstellen eines Identifikations- oder Sicherheitsprodukts mit mindestens einer taktil erfassbaren Erhebung

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DE10139719A1 (de) * 2000-11-04 2002-05-08 Kurz Leonhard Fa Mehrschichtkörper, insbesondere Mehrschichtenfolie sowie Verfahren zur Erhöhung der Fälschungssicherheit eines Mehrschichtenkörpers
DE102004022080A1 (de) * 2004-05-05 2005-11-24 Giesecke & Devrient Gmbh Wertdokument mit visuell erkennbaren Kennzeichnungen
EP1918123A1 (fr) * 2006-10-31 2008-05-07 Maurer Electronics Gmbh Support de données sous forme de carte et son procédé de fabrication

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DE102013000152A1 (de) 2014-07-10
WO2014106517A1 (fr) 2014-07-10
EP2941355B1 (fr) 2017-09-06
PL2941355T3 (pl) 2018-01-31

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