EP1525102A1 - Document de valeur - Google Patents

Document de valeur

Info

Publication number
EP1525102A1
EP1525102A1 EP03764992A EP03764992A EP1525102A1 EP 1525102 A1 EP1525102 A1 EP 1525102A1 EP 03764992 A EP03764992 A EP 03764992A EP 03764992 A EP03764992 A EP 03764992A EP 1525102 A1 EP1525102 A1 EP 1525102A1
Authority
EP
European Patent Office
Prior art keywords
document
value
marking
security paper
laser
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
EP03764992A
Other languages
German (de)
English (en)
Other versions
EP1525102B1 (fr
Inventor
Reinhard Plaschka
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 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=30771718&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1525102(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE10232786A external-priority patent/DE10232786A1/de
Priority claimed from DE2002147591 external-priority patent/DE10247591A1/de
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP1525102A1 publication Critical patent/EP1525102A1/fr
Application granted granted Critical
Publication of EP1525102B1 publication Critical patent/EP1525102B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—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
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
    • B42D2035/50—

Definitions

  • the invention relates to a value document with a security paper and a security paper with a tactilely detectable marking as well as a method for producing the value document or the security paper.
  • Banknotes, checks, tickets, admission tickets and other documents of value, in particular of paper, are equipped with security features for the purpose of counterfeit protection, by means of which the authenticity of the documents of value can be checked.
  • DE 28 36529 C2 proposes using a suitably controlled laser beam to burn the serial number out of a printing ink layer.
  • EP 0 918 649 B1 it is proposed to repeat the identification number elsewhere in the document by locally reducing the document thickness by means of laser etching. In the two aforementioned cases, material is removed using laser radiation.
  • the aforementioned security features are each visually recognizable security features.
  • new security features in particular also for security features that can be perceived with another sense organ, for example tactile security features that can be detected with the sense of touch.
  • the object of the present invention is therefore to propose a document of value with a tactile detectable security feature and in particular a method for producing such a security feature on a document of value.
  • a value document made of security paper is marked by means of a laser, so that a tactile marking in the form of a relief structure is created. It has been shown that with appropriate coordination of the composition of the security paper and the labeling parameters, such as the type of laser used, laser power, operating mode of the laser, wavelength, etc., a relief-like structure can be achieved in the security paper that is tactile detectable.
  • the laser marking also leads to a color change or a color change of the security paper in the marked area. Because of the clear contrast to the surroundings, this enables simple inspection by the human eye or by an image processing device.
  • the type and color of the color change depends on the composition of the security paper used. Security papers in which the laser inscription produces a light gray to black marking are preferably used for the value documents according to the invention.
  • This color change or change in color can be reinforced by suitable additives which can be contained in the security paper.
  • suitable additives which can be contained in the security paper.
  • the type of additives used depends on the type of laser used or the laser wavelength used. Additives that absorb laser radiation are conceivable, such as, for example, carbon black, thermochromic substances, laser iriodines from Merck or even titanium dioxide.
  • the security paper can also be multi-layered.
  • the security paper can consist of two paper layers, between which any other layer, such as a color layer, metal layer or foamable layer, is arranged.
  • the foamable layer supports the formation of the tactile marking by the laser beam.
  • foamable layers can contain, for example, black powder or blowing agents, which develop gas under the action of heat, or also hollow chamber balls which contain a gas which expands under the action of heat.
  • foaming additives can also be added directly to the paper or to one of the layers of a multilayer security paper. Alternatively, it is also possible to offset the surface sizing of the security paper with these additives.
  • Pulsed Nd Y AG lasers with a wavelength of 1064 nm are preferably used for the laser inscription of such security papers.
  • other laser types and / or wavelengths or labeling parameters can be useful.
  • YAG laser can be used in the pulsed or continuous wave mode.
  • C0 2 or excimer lasers can also be used.
  • Nd: YAG lasers are preferably used at the basic wavelength of 1064 nm with an average power of 65 W and a modulation frequency of approx. 10 kHz.
  • the speed at which the laser is moved over the paper is between 330 and 1350 mm / s, the diameter of the laser beam hitting the paper being approximately 120 ⁇ m.
  • the speed can be increased even further to values up to 2700 mm / s.
  • the modulation frequency of the laser must be increased to approx. 12 kHz.
  • the labeling speed is very much related to the surface energy required to create a tactile marking. With untreated cotton wove paper, this surface energy is at least 0.31 J / mm 2 . However, this value can be changed, in particular reduced, by appropriate additives in the paper, so that higher labeling speeds are possible.
  • the height of the tangible relief in relation to the surface of the value document in turn depends on the speed of the inscription. At medium to high speeds, relief heights of 30 to 80 ⁇ m can be achieved. At slow speeds, 100 ⁇ m relief height can be realized. A compromise between the desired relief height and economical marking speed must therefore be chosen
  • the line width and thus the resolution of the tactile marking is limited by the diameter of the laser beam, i.e. the resolution corresponds to a maximum of the diameter of the laser beam.
  • line widths of approx. 200 to 600 ⁇ m are sufficient in many applications.
  • the marking parameters can also be set so that the relief structure within the marking has different relief heights and / or degrees of blackening.
  • the relief height that can be generated can be increased or decreased gradually or continuously. In this way, direction-dependent, tactile markings can be created. That depending on the direction in which you stroke the marking, the relief is more or less palpable.
  • the relief height of the marking can also be increased by repeatedly irradiating the same area with laser radiation.
  • the laser beam and the value document or security paper to be labeled do not necessarily have to be arranged perpendicular to one another.
  • the laser beam can enclose any angle with the paper.
  • Different laser energies can also be used to generate information according to the invention, so that different relief heights and / or blackening arise within the information. If, for example, a two-dimensional code is generated in this way, a three-dimensional code can be generated by the different blackening. Ie the degree of blackening is used as a further coding used level, which can be evaluated with appropriate detectors, for example.
  • the laser marking can be used to represent alphanumeric characters, for example serial numbers of the value documents or any codes, such as, for example, one-dimensional or two-dimensional bar codes or blind codes, any symbols or images. Any alphanumeric characters, such as date, time, batch name, or lettering, such as the signature of a minister or central bank president, are also possible.
  • any geometric pattern can also be created, such as a knob structure.
  • the tactile nubs can be very small due to the relatively small laser focus, i.e. with a small diameter, and in comparison, large elevation over the surface of the document are generated. This type of marking with a high-resolution structure while at the same time being very grand, i.e. high tactility, cannot be adjusted using printing technology.
  • the surroundings of information to be displayed can also be designed to be tactile, while the information itself cannot be felt tactilely.
  • the information is carried out in the form of a negative representation.
  • the marking can be in the form of information which can be recognized visually without aids or in the form of micro-writing which can only be clearly recognized using a magnifying glass.
  • the tactile marking can be arranged at any point on the surface of the document of value or also at several points of the document of value without significant restriction.
  • the markings produced according to the invention with a laser can supplement markings generated in another way and thus form a new security element.
  • a colored line print can be combined with a line relief produced according to the invention in such a way that the colored lines come to lie on the flanks of the relief. When the viewing angle is varied, different visual impressions result due to shadowing effects.
  • markings can be identical or different in content.
  • the markings can also have any connection to one another or to information that is generated on the document using other methods, and in this way contribute to a further increase in the security against forgery. For example, a check digit calculated for the serial number of the value document can be lasered.
  • the document of value according to the invention is any document, the essential component of which is a security paper, such as , for example , a banknote, a check, a visa, a label, a passport page or another document to be secured from security paper.
  • the document of value can also consist of a paper / film composite, the area of the security paper with the tactile laser marking preferably being freely accessible in order to ensure tactile testability. This can be done in that the document of value or the security paper only has a film on the side facing away from the marking, or in that the area of the marking in the form of a window is left out in the film. It can also make sense to laser mark the border area between paper and stretch film.
  • the film is only blackened or additionally broken open, so that another tangible relief is created.
  • the tactile marking can be overprinted without losing tactility. Will it e.g. With a metallic overprint, this creates special light / dark effects, depending on the reflection of the metal-colored layer. If the printing ink appears bright at a certain viewing angle due to the directional reflection, the diffusely scattering, tactile marking can be recognized as dark information against this light background and vice versa.
  • the tactile marking can also be overprinted with a printing ink which has the same color tone as the tactile marking generated with the laser. If, for example, a Nd: Y AG laser working in the infrared spectral range is used to generate the tactile marking and the tactile marking shows a gray appearance, this marking can be overprinted with a gray printing ink to camouflage the visual visibility.
  • the document of value according to the invention can have further security features, such as, for example, a security thread, an optically variable security element, a security imprint, or machine-readable security features, such as, for example, luminescent or magnetic substances.
  • the laser marking according to the invention can also be provided in the area of the security thread. If the security thread is woven into the value document as a so-called “window security thread”, ie if the security thread appears directly on the surface of the value document in places, the Laser marking can be provided in the intermediate areas in which the security thread is embedded in the value document. Alternatively, as already mentioned, the marking can also extend over the border area between film and paper, so that the security thread also bears a laser marking. It is also possible to mark the security thread exclusively in the window area.
  • the documents of value according to the invention can also be used to secure products of any kind.
  • the tactile marking according to the invention can also be combined with other tactile security elements, such as intaglio printing.
  • intaglio printing the different tactilities are used.
  • the relief produced by intaglio printing forms a hard or sharp transition to the surroundings, while the marking according to the invention has a soft transition and a soft, velvety, tactile surface.
  • the tactile intaglio printing marking can form the frame for a colored, imperceptible field, which preferably has the same color as the tactile perceptible edge and is also produced in intaglio printing. If this color absorbs laser radiation, it is leached when exposed to the laser and at the same time the tactile laser marking can arise.
  • the laser marking can also be generated without ablation of the color layer.
  • This colored area can additionally be underlaid with a primer layer which contains luminescent substances and / or has a positive influence on the release properties of the paint to be ablated and / or has a positive effect on the durability of the paint which is not to be removed.
  • the printing ink arranged in the region of the laser marking can also have magnetic or conductive properties or be formed by an organic semiconductor layer that lights up (OLED).
  • OLED organic semiconductor layer that lights up
  • the subsequent laser inscription creates disturbances in the machine-measurable signal of the individual layers, which can serve as a further authenticity feature.
  • These faults can, for example, represent individualizing information such as the serial number. In this way, the visually visible and tactile laser marking can also be checked by machine.
  • the security paper or document of value can also be provided with a coating which contains soot and hollow chamber balls.
  • the laser radiation is absorbed by the soot content and a visually visible blackening occurs.
  • the hollow chamber spheres expand or are destroyed with the evolution of gas, so that a relief can be felt. There are then no hollow spheres in the blackened area.
  • the document or security paper is tilted, there is also a reversal of contrast due to the different reflection properties of the flanks and the areas surrounding them.
  • the document of value has an additional coating in the area of the tactile marking according to the invention.
  • the laser marking can be present completely or only partially in the area of the coating. This can be any print image, such as alphanumeric characters, logos, patterns, guilloches etc., a full-surface coloring or lacquer layer or also a multi-layer security element, such as a structure which can be observed in reflection and has a diffraction-optical effect.
  • the coating can therefore be printed, evaporated, sprayed on or transferred using the transfer process.
  • the laser inscription is preferably introduced in optically variable printing layers, such as printing layers containing liquid-crystalline pigments or interference layer pigments, or metallic layers, for example made of aluminum, silver or gold.
  • the coating is transparent to the laser radiation used, if the labeling parameters are selected accordingly, the tactile marking is generated in the underlying security paper, which at the same time bulges the coating without destroying it. If the coating is translucent and the laser marking causes a color change in the security paper, this is visible in addition to the tactile relief of the marking according to the invention. If the coating is a colored printed image or a layer of color, its color impression can be determined by the marking underneath, i.e. change in color of the security paper. In this way, in addition to a tactile marking, a visually recognizable marking can also be created in a colored area, which differs in color from the surroundings.
  • the coating consists of a multilayer security element applied to the security paper or value document, for example in the form of a label or transfer element.
  • the security element seen from the viewer has the following layer sequence: a plastic layer, preferably a lacquer layer, a metal layer, such as a thin aluminum layer, and an adhesive layer for attaching the security element to the security paper or value document.
  • the lacquer layer can additionally have an embossing that produces visually observable diffraction-optic effects, such as a hologram or any diffraction grating image.
  • marking with a laser preferably an Nd: Y AG laser
  • the metal layer is removed in certain areas.
  • the marked security paper bulges the film layer structure of the security element, so that the tactile marking is created.
  • the varnish layer of the security element is hardly, or completely, removed by this process, depending on the choice of the labeling parameters. If the marking parameters are selected appropriately, the security paper is blackened at the same time. This blackening is clearly visible through the transparent area of the security element which has been freed from the metal layer.
  • the marking parameters can also be set so that the area in which the metal layer is removed is larger than the partial area provided with a tactile marking.
  • the tactilely detectable laser-marked area is surrounded by an extremely smooth area in this embodiment, the tactility of the security feature is additionally enhanced.
  • the tactile detectability of the security feature can also be improved in that the substrate is calendered before the laser marking. This also creates the security feature in a particularly smooth environment.
  • creating a tactile marking using a laser works better on rough surfaces, i.e. In order to be able to reach a certain relief height, less laser energy is necessary for rough surfaces.
  • the security paper or document of value can also be exposed to the laser radiation from the surface opposite the film element. This gives the tactile marking on the surface facing the laser. At the same time, the metal layer of the film element is ablated in the acted upon area, so that the marking is also visible on the side of the film element. A kind of review register is therefore created.
  • the fiber-containing substrate of the value document is marked at least in a partial area of its surface by means of laser radiation in such a way that the fibers in the laser-marked partial area protrude noticeably from the surface of the substrate in order to form a tactile detectable security feature.
  • the fibers of the security paper usually run largely parallel to the surface of the security paper in the surface area and are held in this position by the gluing.
  • the fiber composite is broken up by the laser radiation and individual fiber ends detach from the association, so that the fibers protrude above the substrate surface due to their inherent tension.
  • These fibers preferably form a braid protruding from the substrate surface that creates the tactile marking.
  • particularly suitable fiber-containing substrate materials have been found to be cotton vellum paper and other cotton security papers which, compared to other papers, have long fibers with high tear strength. These types of paper are particularly suitable for security printing anyway. Tests with cotton security paper using an Nd: Y AG laser (wavelength 1064 nm) have led to particularly good results, as already explained in detail.
  • a coating can be provided on the surface of the substrate, through which the laser marking takes place.
  • the coating is evaporated by means of laser radiation and the fiber structure of the fiber-containing substrate underneath is broken up, so that the fibers protrude from the substrate surface.
  • the coating can be, for example, a film, in particular a hologram film.
  • the tactile, laser-marked partial area is surrounded by an extremely smooth area, which increases the tactile detectability of the security feature.
  • the coating consists of a layer that does not absorb the laser radiation, in particular a flat print or a sample print, such as a guilloche pattern.
  • a layer that does not absorb the laser radiation in particular a flat print or a sample print, such as a guilloche pattern.
  • Such printed color layers are regularly so thin that they also break open when the underlying fiber structure is broken open. so that the fibers of the substrate in turn protrude noticeably from the substrate surface.
  • the non-absorbent layer can also be a surface, in particular a transparent, thin lacquer layer which smoothes the surface and which is likewise broken up by the fibers detaching from the fiber structure.
  • This variant is also characterized by an increased detectability of the tactile security feature within a smooth environment.
  • Any thin coating is suitable as a non-absorbent layer, which is broken up by the fibers that arise when the fiber composite is broken open, be it printed, vapor-deposited or sprayed on.
  • the non-absorbent layer is admixed with additional substances, for example luminescent substances, which are only visible under special conditions or which can only be seen in the invisible wavelength range, in particular in the UV range.
  • additional substances for example luminescent substances, which are only visible under special conditions or which can only be seen in the invisible wavelength range, in particular in the UV range.
  • a further security feature is particularly advantageously integrated into the value document. Because by setting up the fibers of the substrate and breaking up the non-absorbing layer, a special contrast is achieved in comparison to the area of the non-absorbing layer surrounding the laser marking, which can be detected visually or with suitable inspection devices.
  • the laser marking also leads to a color change or a color change in the marked partial area, as a result of which a significant increase in contrast is achieved for checking by the human eye or by an image processing device.
  • this color change is preferably reinforced by suitable additives which can be contained in the fiber-containing substrate.
  • the color change is caused thermally by the energy introduced with the laser radiation or by other wavelength-dependent color change mechanisms.
  • Laseririodine from Merck are also suitable as additives in this example.
  • the thermally generated color change can be additionally enhanced by suitable absorption materials.
  • the raised and tactile markings can also be visually distinguished from their surroundings due to a change in the color of the marked areas, this has the advantage that adjustments are made more difficult by simply embossing them, since in this case the markings would also have to be printed precisely to show the corresponding color contrast.
  • the tactile perceptible marking can also be created through the interaction of various mechanisms.
  • the laser radiation alone can cause the fiber substrate to swell or the fiber structure to break open.
  • the breaking up of the fiber structure leads to a relief structure which is formed by fibers which protrude from the substrate surface.
  • the tactile relief can also consist of a combination of the effects mentioned.
  • the substrate material is both inflated and at least partially broken up, so that individual fibers protrude from the substrate surface and form a network interspersed with cavities.
  • the laser marking step takes place at any stage in the production of the value document. For example, it may make sense to roll up the security paper with a suitable appropriate marking. This is particularly the case if the security paper is provided in a continuous form with a film coating, such as a security element that has an optical diffraction effect, for example a stripe-shaped security element, and this security element is to be provided with a marking according to the invention, as described above.
  • the laser marking step is preferably carried out as one of the last work steps in the production of the value document. If, for example, the value documents are printed in the form of sheet-like multiple uses, the laser marking can still be carried out on the sheet or on the cut, finished value document. The latter is particularly useful if tactile individual information, such as a serial number, is to be generated by means of the laser marking. If necessary, the lasered information can be checked again for correctness in a final step.
  • a particular safety-related advantage of the present invention can be seen in the fact that the described effect cannot be simulated 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 machines or digital printing devices.
  • each document can be marked individually, for example by integrating the serial number or another individualizing feature as a tactile security feature in the value document.
  • the coating or at least one of the layers of the coating or of the security element is admixed with additives, for example luminescent substances, which are only visible under special conditions or which can only be seen in the invisible wavelength range, in particular in the UV or IR range.
  • additives for example luminescent substances, which are only visible under special conditions or which can only be seen in the invisible wavelength range, in particular in the UV or IR range.
  • a further security feature is integrated into the value document.
  • the layer to be evaporated should expediently be the top layer.
  • Another advantage of the invention can be seen in the fact that the laser inscription makes it possible for the first time to provide markings which can be felt in the edge region of a value document, in particular a bank note.
  • a value document in particular a bank note.
  • the tactile marking according to the invention in no way hinders the cutting process, so that the marking can be extended into the cutting edge. This has the advantage that the tactile marking is immediately perceived as an authenticity feature, since banknotes are primarily touched at the edge.
  • Fig. 12 is a schematic representation of a laser labeling device for labeling a security sheet.
  • the document of value 1 has a tactile marking 2 in the form of a relief structure which was produced by the action of a laser beam.
  • the example shown additionally has a security element 3 in the form of a patch, which can be, for example, a transfer element or a label with structures having an optical diffraction effect.
  • a laser marking 4 in the area of the security element 3 there is also a laser marking 4 according to the invention which can be tactilely felt.
  • the contents of the two laser markings 2, 4 are identical in the example shown.
  • the security document has further information 9 which can be obtained using any other method, e.g. Intaglio printing process, InkJet or the like, is applied.
  • the two laser markings 2, 4 can also be designed completely independently of one another or have a specific relationship with one another, which forms an additional authenticity feature. In this way, it can be checked whether the security element 3 is actually used for the document of value. heard 1.
  • one or both laser markings can have any content-related relationship with other information on the value document, such as information 9.
  • the security element 3 can also have any other shape.
  • another type of coating such as a lacquer or foil coating, or any print image can be selected.
  • the value document 1 can also have further security features, such as a security thread, luminescent, electrically conductive or magnetic security features.
  • the value document 1 does not necessarily have to be a banknote, but it can represent any other document made of a paper substrate, such as a check, a security label, a visa, a passport page, etc. It is essential that one of the freely accessible Components of the value document consist of a fibrous paper substrate. This is preferably pure cotton fiber paper or a mixture of cotton and plastic fibers.
  • FIG. 2 shows a section through the document of value 1 along the line A - A.
  • the document In the area of the laser marking 2, the document has a noticeable elevation 5, which was created by the action of the laser beam. How far the elevation 5 protrudes beyond the remaining substrate surface 6 depends very much on the laser energy used and the relative speed between the document of value and the laser beam during the labeling process.
  • the actual fiber structure in the marked area also depends very much on the labeling parameters and the paper substrate used.
  • this layer of glue together with the calendering of the paper, ensures a uniform and, in the first approximation, closed surface.
  • FIG. 3 shows the surface area of such a security paper 20 according to the invention made of cotton fibers in the area of the laser marking 2.
  • the entire section of the security paper 20 shown is impregnated with the glue layer, which, however, is not shown for reasons of clarity.
  • the security paper 20 has the uniform surface due to the production.
  • the glued surface is broken up and the fiber composite is loosened, i.e. Cavities 52 probably arise between the fibers 51 due to gas development.
  • a relatively coarse-meshed network of cotton fibers 51 protruding beyond the surface 61 of the security paper 2 is formed, which are still covered by the glue layer.
  • FIG. 4 also shows a section through the document of value 1 along the line AA. Due to the action of the laser beam, in addition to the elevation 5, a color change, in particular a blackening 7, of the value document material was also generated here. Whether and how deep the color change or blackening 7 is in the value document material 1 also depends very much on the labeling parameters and the composition of the security paper used for the value document 1.
  • FIG. 5 shows a section through the document of value 1 along the line B - B.
  • a coating in the form of a security element 3 is arranged in the region of the laser marking 4, 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 31.
  • This metal layer 32 is missing in the area of the laser marking 4.
  • the metal layer 32 is evaporated and / or decomposed and is no longer visible.
  • the color change 7 caused by the laser inscription is therefore visible through the lacquer layer 33 and the adhesive layer 31.
  • the labeling parameters can be set such that the area in which the metal layer 32 is removed is larger than the partial area provided with a tactile marking. In this way, the visually visible color change or blackening generated by the laser is surrounded by a transparent area.
  • the plastic layer 33 and the adhesive layer 31 are hardly or not damaged by the laser. Whichever If labeling parameters are used, individual or both layers can also be partially or completely removed.
  • the fiber-containing substrate can also be equipped with a transparent or pigment-containing color layer. It is important in this context that the color layer does not absorb the laser radiation used for the laser marking.
  • the color layer can be applied to the substrate in any desired manner, for example printed on. It is particularly advantageous if the color layer creates a smooth impression of the substrate surface. In this sense, "color layer” is also to be understood as a dirt-repellent, possibly transparent, coating or protective coating.
  • the color layer does not absorb the laser radiation used, the laser energy is only absorbed in the substrate layer.
  • the elevation 5 is thus generated in the substrate, so that a tactile marking is created within the color layer.
  • the non-absorbent color layer preferably contains dyes which are only visible under certain conditions, such as, for example, luminescent dyes, or which have properties which are not visible to the human eye, for example substances which glow in the infrared or UV region.
  • the color layer does not have to be full-area. It can also be a color sample, in particular one of the guilloche patterns frequently used in security printing. The only condition is that the color layer of the pattern is largely transparent to the laser radiation used.
  • 6 shows a further embodiment of the value document 1 according to the invention in supervision. In this case, the tactile marking 2 extends into the edge area of the value document 1. Since banknotes are usually touched at the edge during manual processing or in normal payment transactions, this arrangement of the tactile security element in the edge area has the advantage that it is very simple and can be checked quickly.
  • tactile authenticity features such as, for example, a tactile intaglio printing
  • a tactile intaglio printing cannot be arranged or can only be arranged poorly in the edge region of the value document 1, since the value documents are printed in sheets with several uses and then cut into the individual uses. If the intaglio printing element is arranged in the edge area, however, there is a risk that the cutting tools will smear with color when the sheets are cut in individual uses.
  • different laser parameters in particular laser energies
  • This embodiment has the advantage that it feels different from left to right or right to left depending on the direction of the stroke.
  • This feature can be used as an additional security feature. Due to the different laser energies used, there is also a different blackening effect that is visually recognizable. The individual saw teeth thus have different shades of gray.
  • FIG. 8 A security feature is described in FIG. 8, which consists of a combination of a tactile intaglio printing element and an inventive according to the tactile laser marking generated.
  • the tactile intaglio marking 26 forms an edge region which encloses the tactile laser marking 27.
  • the security paper 100 is pressed into the intaglio printing plate, so that the paper is deformed in this area.
  • the paper absorbs color 28 in the embossed area.
  • the tactilely perceptible effect of the intaglio marking 26 thus arises from the embossing and the simultaneously high ink application 28 in the embossed area.
  • This type of marking forms steep flanks and, as a hard, abruptly falling element, can be distinguished very tactilely from the soft, almost velvety laser marking 27.
  • FIG. 9 shows a security paper which was printed with colored line patterns 30, 31 in a first step.
  • the border area between the printed lines 30, 31 is then labeled using a laser according to the invention, so that a tactile relief is created. Due to the arching of the security paper in area 5, lines 30, 31 are shifted onto the flanks of raised areas 5.
  • This combination of printed lines 30, 31 and raised areas 5 forms an optically variable security element which provides different visual impressions depending on the viewing direction. If, for example, lines 30 are lines of a first color and lines 31 are lines of a second color, only the colored lines 31 of the second color can be seen when viewed obliquely from the left. The security element therefore appears in this second color. The lines 30 cannot be seen due to the shadowing effects.
  • the lines 31 are shaded, so that ideally only the colored lines 30 can be seen.
  • the security element thus appears in the first color.
  • the printed and the lasered lines do not necessarily form an exact grid; it is sufficient if a portion of the printed lines form the effect.
  • FIG. 10 shows a further embodiment of the security element 100 according to the invention.
  • a security element 3 is arranged on a surface of the security paper 100, as has already been described in connection with FIG. 5.
  • This security element consists of an adhesive layer 31, a diffraction structure 34 and a reflection layer 32 and a protective layer 33.
  • This security paper 100 is provided with a laser marking 2 according to the invention on the opposite surface.
  • the laser energy and the other laser parameters are set in such a way that a raised mark 5 is formed and at the same time the originally continuous metallization 32 of the security element 3 is destroyed in the area exposed to the laser.
  • the security element 3 is transparent in the area exposed to the laser radiation, so that the blackening generated simultaneously with the raised marking 5 is visible through this transparent area.
  • the elevation 5 according to the invention is, however, on the opposite side of the security element 3 and can practically not be felt on the surface of the security element 3.
  • the exemplary embodiments can also be combined with one another by first arranging the color layer on the surface of the substrate and, above it, a film-like material.
  • the film-like material is first evaporated with the laser and the color layer under the film is exposed.
  • the tactile marking 5 is created in the substrate by further laser action. If the film material is designed as an opaque film, for example as a metallized plastic film, the laser marking 5 also produces a clearly visible contrast due to the color layer underneath and exposed.
  • the fibers protruding from the substrate surface result in a clear contrast to the surroundings, which can be detected with suitable inspection devices. This effect is therefore well suited for automatic machine testing.
  • the substrate 10 can be a pre-cut value document, a sheet with multiple uses of a value document or a security paper in an endless form.
  • a laser beam 12 is deflected via two mirrors 13 which are driven by galvanometers 14, one mirror 13 being responsible for the x and the other mirror 13 for the y orientation.
  • the laser beam 12 is focused on the surface of the substrate 10 and generates the marking 11.
  • the substrate 10 can move at the speed v during the marking process.
  • This speed v is detected by sensors and transmitted to a computer in order to control the galvanometer 14 via the computer in such a way that the speed v is compensated for.
  • This marking method can therefore be used particularly advantageously in the contactless marking of documents of value which, as is customary in printing houses, are processed at high speeds.
  • the substrate 10 can also be marked in another way, for example by means of a matrix of point-emitting laser beams or by means of beams of larger cross-section, which are partially covered by a template.
  • Such templates can be made automatically changeable. If it is not possible or undesirable to carry the radiation according to the speed v, it is also possible to mark moving substrates by selecting a short exposure time. Beam guidance through polygon mirrors is also possible.
  • C0 2 lasers are used as radiation sources
  • Nd Y AG lasers or other types of lasers, for example also those that can work like Nd: Y AG lasers with frequency doubling or tripling.
  • the marking results can be varied by varying the labeling parameters, such as laser power, exposure time, working mode of the laser, etc.
  • the height of the elevations generated by the laser can be varied accordingly.
  • the tactile marking preferably has a height of 30 to 100 ⁇ m. It is also necessary to adapt the composition of the paper to the laser radiation or laser power used.
  • the markings are made, for example, with an Nd: Y AG laser, the fundamental wavelength of which is 1064 nm and which has an average power of 26 W and a modulation frequency of 8 kHz.
  • the diameter of the laser beam on the substrate is approximately 100 ⁇ m and the travel speed of the laser beam over the substrate is 250 to 1000 mm / s.
  • the typical height of a marking according to the invention thus produced is between 30 and 80 ⁇ m. In individual cases, ie Particularly at low travel speeds, significantly larger values were also achieved, for example a height of over 100 ⁇ m at 250 mm / s.
  • the width of the markings can be varied between 0.2 and 0.6 mm.
  • the dimensions of the marking produced at 250 mm / s are 65 ⁇ m average height and approx. 0.5 mm average width.
  • the dimensions were 35 ⁇ m average height and 0.3 mm average width.
  • FIG. 12 shows an embodiment of the device according to the invention, in which a sheet with a plurality of lasers is simultaneously provided with a marking according to the invention.
  • the sheet has six columns and six rows, so that 36 single-use documents of value are arranged on this sheet.
  • a laser tube is arranged above the printed sheet, which in each case provides the individual uses arranged in this column with the marking according to the invention.
  • the throughput can be greatly increased, since not a single laser beam moves over the entire printed sheet only a movement parallel to the columns of the printed sheet is required.
  • the individual benefits are labeled by deflecting the laser radiation using mirrors, which are not shown in the example shown.
  • the lasers can be provided with a scanning head 43.

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  • Engineering & Computer Science (AREA)
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  • Physics & Mathematics (AREA)
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  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Finance (AREA)
  • Accounting & Taxation (AREA)
  • Business, Economics & Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Credit Cards Or The Like (AREA)
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  • Laser Beam Processing (AREA)

Abstract

Document de valeur (1), tel que par exemple un billet de banque ou analogue, qui est constitué de papier de sécurité. Au moins un marquage tactile (2) sous forme de structure en relief est produit sur le papier de sécurité à l'aide d'un laser.
EP03764992A 2002-07-18 2003-07-15 Document de valeur Expired - Lifetime EP1525102B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10232786 2002-07-18
DE10232786A DE10232786A1 (de) 2002-07-18 2002-07-18 Papierenes Wertdokument mit Sicherheitsmerkmal
DE2002147591 DE10247591A1 (de) 2002-10-11 2002-10-11 Wertdokument
DE10247591 2002-10-11
PCT/EP2003/007658 WO2004009371A1 (fr) 2002-07-18 2003-07-15 Document de valeur

Publications (2)

Publication Number Publication Date
EP1525102A1 true EP1525102A1 (fr) 2005-04-27
EP1525102B1 EP1525102B1 (fr) 2012-09-26

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EP03764992A Expired - Lifetime EP1525102B1 (fr) 2002-07-18 2003-07-15 Document de valeur

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US (1) US8827314B2 (fr)
EP (1) EP1525102B1 (fr)
JP (1) JP4680594B2 (fr)
CN (1) CN100572089C (fr)
AU (1) AU2003257466B2 (fr)
BR (1) BR0312775A (fr)
CA (1) CA2493388C (fr)
MX (1) MXPA05000756A (fr)
PL (1) PL215626B1 (fr)
RU (1) RU2321498C2 (fr)
WO (1) WO2004009371A1 (fr)

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PL215626B1 (pl) 2014-01-31
CA2493388A1 (fr) 2004-01-29
CN100572089C (zh) 2009-12-23
PL372927A1 (en) 2005-08-08
CA2493388C (fr) 2012-01-24
JP4680594B2 (ja) 2011-05-11
US8827314B2 (en) 2014-09-09
WO2004009371A1 (fr) 2004-01-29
JP2005532937A (ja) 2005-11-04
RU2321498C2 (ru) 2008-04-10
RU2005104553A (ru) 2006-08-20
BR0312775A (pt) 2005-05-03
CN1668480A (zh) 2005-09-14
EP1525102B1 (fr) 2012-09-26
AU2003257466A1 (en) 2004-02-09
AU2003257466B2 (en) 2007-08-02
US20060145468A1 (en) 2006-07-06
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