EP1776674B1 - Support de donnees a element de securite, et son procede de production - Google Patents

Support de donnees a element de securite, et son procede de production Download PDF

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Publication number
EP1776674B1
EP1776674B1 EP05763045.1A EP05763045A EP1776674B1 EP 1776674 B1 EP1776674 B1 EP 1776674B1 EP 05763045 A EP05763045 A EP 05763045A EP 1776674 B1 EP1776674 B1 EP 1776674B1
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EP
European Patent Office
Prior art keywords
laser
print image
data carrier
marking
laser marking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05763045.1A
Other languages
German (de)
English (en)
Other versions
EP1776674A1 (fr
Inventor
Georg Depta
Karlheinz Mayer
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
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Filing date
Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to PL05763045T priority Critical patent/PL1776674T3/pl
Publication of EP1776674A1 publication Critical patent/EP1776674A1/fr
Application granted granted Critical
Publication of EP1776674B1 publication Critical patent/EP1776674B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
    • B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
    • B41J2/471—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/06—Lithographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/10—Intaglio printing ; Gravure printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen 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

Definitions

  • the invention relates to a data carrier, in particular a document of value, such as a banknote, an identity card and the like, with a security element having a printed image and a laser marking at least partially overlapping the printed image.
  • the invention further relates to a method for producing such a data carrier, a method for producing a data carrier with a security element with two printed images and a method for producing a plurality of individual benefits of data carriers on a sheet or a roll.
  • Data carriers in the context of the present invention are in particular security or value documents, such as banknotes, passports, identity documents, check forms, shares, certificates, stamps, vouchers, air tickets and the like, as well as labels, seals, packaging and other elements for product assurance.
  • security or value documents such as banknotes, passports, identity documents, check forms, shares, certificates, stamps, vouchers, air tickets and the like, as well as labels, seals, packaging and other elements for product assurance.
  • data carrier in the following includes all such documents and product securing means.
  • Identity cards such as credit cards or identity cards
  • the optical properties of the substrate material are irreversibly changed by suitable guidance of a laser beam in the form of a desired marking.
  • a laser marking makes it possible to combine the individualization of the data carriers with security elements and to integrate them more freely into the printed image than in conventional individualizations, for example in the case of known indexing methods.
  • register variations arise, for example, due to production tolerances in the production of masters, printing plates or printing screens, due to spacing variations of the printing area from the edges of the preprinted substrate in a machine change between different printing processes, such as screen printing, simultaneous printing, intaglio printing, ciphering, or because the substrate and the Change plates in the printing process, for example in a Auswalz suits, or the associated operations, such as a drying step in their dimensions.
  • the register variations can be up to +/- 3.5 mm in unfavorable cases.
  • security printing is expected to have subsurface and intaglio printing with fluctuations of +/- 1.5 mm, between background and screen printing with fluctuations of +/- 2 mm.
  • Foil elements can be applied with fluctuations of +/- 1.5 mm relative to a background pressure.
  • register variations are especially noticeable in the case of round or rounded printing elements, which are marked along a concentric or rounding path.
  • WO 00/43216 A is a tamper-proof document with a security feature in the form of a perforation known.
  • the image formed by the perforation pattern corresponds to another image created, in particular, by laser ablation. Both images, ie both the perforation pattern and the laser ablation, coincide exactly
  • the present invention seeks to provide a data carrier of the type mentioned and a manufacturing method with which the disadvantages of the prior art are overcome.
  • register fluctuations between two printed images or between a printed image and a laser marking should be avoided or rendered largely invisible on visual inspection.
  • the security element of a generic data carrier on the print image at least partially overlapping laser modification area, which stands in the register to the laser marking and in the overlap region with the printed image, the visual appearance of the printed image is modified by the action of a laser beam, wherein the laser marking and the laser modification range does not coincide.
  • the invention is based on the idea of permitting register fluctuations between the printed image and the laser marking, and of modifying the visual appearance of the printed image in a subarray in the register for laser marking in such a way that registration fluctuations between the printed image and the laser marking are visible to the viewer Background and instead the (perfect) register between the laser marking and the modification area dominates the visual appearance of the security element.
  • the laser modification region forms an outline of a predetermined width which surrounds the edge of the printed image.
  • the width of the circumferential contour is matched to the size of the register fluctuations between the printed image and the laser marking, so that all typically occurring register fluctuations can be compensated.
  • the print image of the security element can be embodied, for example, in screen printing, offset printing, indirect high-pressure, high-pressure, digital printing, color-guiding or blind embossing intaglio printing. Of course, combinations of printing methods can be used.
  • the printed effect layer may in particular consist of metal, a metallic color or a color containing interference layer pigments and be bronze, copper, silver or gold.
  • a color mixture which has a mixture component which absorbs the laser radiation and a mixture component transparent to the laser radiation can also be used as the printing ink.
  • the laser marking of the printed image is then visually recognizable due to a laser-induced irreversible change in the optical properties of the color mixture.
  • the absorbent mixture component can be bleached, vaporized, changed in its reflection properties or converted by a chemical reaction into a material having different optical properties.
  • optically variable liquid-crystal pigments and, for the absorbing mixture component, optically variable interference-layer pigments are suitable as the mixture component transparent to the laser radiation.
  • Other color components that 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 absorbing mixture component.
  • the printed image can also consist of several superposed color layers, wherein at least one of the color layers for the laser radiation is absorbent or contains absorbing components.
  • the visual design of the printed image can thereby be decoupled from the requirements of the laser beam absorption.
  • the layers arranged above an absorbing ink layer can be removed during laser marking.
  • a liquid crystal layer over an infrared-absorbing Be provided pressure layer.
  • the IR-transparent liquid crystal layer is then removed together with the IR-absorbing background layer at the laser-exposed areas.
  • the printed image may also contain a liquid crystal layer over a thermochromic ink layer, wherein the thermochromic ink layer is irreversibly blackened at the laser-exposed areas, so that a clearly visible dark mark is formed within the optically variable printed image.
  • the printed image is oval or circular, and executed in particular in the form of a coin representation.
  • This printed image design is preferably combined with metallic-appearing printing inks, a film patch element or a blind embossing. It makes sense that the laser marking by typical elements, such as a centered portrait or peripheral pattern, font or number representations, the coin character receives and amplified.
  • the print image forms a pattern, in particular a line pattern, such as a guilloche pattern of regularly interlaced lines.
  • a line pattern such as a guilloche pattern of regularly interlaced lines.
  • Other fine-structured patterns such as those often used in security printing, come into consideration.
  • the laser marking of the security element may be in the form of patterns, characters or codes.
  • the mark can consist of alphanumeric characters, as they are usually used for serial numbers of value documents, or form a barcode, so a pattern sequence of bars and gaps, which usually a represent binary sequence of numbers.
  • two-dimensional codes that provide a particularly highly condensed record can be used.
  • the laser marking may contain any symbols or graphic representations that may be distributed virtually without restrictions on the surface of the data carrier.
  • the stroke width of a line marker or the spot size of a raster marker can be changed by focusing the laser beam.
  • Semitransparent areas can be created next to areas with completely eroded ink. With appropriate laser power and a foaming of the substrate is possible, which can lead to an easily recognizable tactility.
  • the modulation frequency of the laser or the pulse train in pulse mode can also be varied.
  • its visual appearance is advantageously modified by the action of the laser beam in the overlapping area of laser marking and printed image.
  • its printing ink can be partially or completely removed by the action of the laser beam.
  • a partial erosion can lead to brightened, bleached or semi-transparent areas within the printed image with reduced thickness of the ink layer.
  • the partial ablation can also be in the introduction of a feinzisel convinced Pattern exist, for example, forms a decorative edge around the printed image.
  • the optical properties of the printed image in at least one of the overlapping regions can be irreversibly changed.
  • the data carrier is not changed visually outside the overlapping area of the laser modification area and printed image.
  • the effect of the laser modification is then limited to the area of the printed image.
  • the laser parameters can be adjusted in the modification so that a tactile marking with a relief structure is generated in the data carrier outside the overlapping region of the laser modification region and printed image.
  • a color layer in particular a security color layer, is provided, which is exposed, activated or deactivated by the action of the laser beam in at least one of the overlapping areas.
  • a security color layer for example, up-conversion substances, phosphorescent, fluorescent or other luminescent substances, magnetic colors, thermoelectric electroluminescent colors, but also colors that absorb outside of the visible spectral range are possible. In this way, machine-readable features can be introduced individually together with the laser marking or the laser modification.
  • the security colors can be used to further check if the element is a laser-marked security element.
  • the laser modification region is generated in the form of a circumferential contour of predetermined width around the edge of the printed image.
  • the laser marking is produced in step b) with certain register variations between the printed image and the laser marking, and the laser modification region is generated in step c) with a predetermined width of the circumferential contour that is matched to the size of the register fluctuations.
  • Laser marking and the laser modification area are advantageously produced in the same operation with the same laser marker so that they are in perfect register with each other.
  • the laser marking and the laser modification area can be generated in any order. In some embodiments, however, it is advantageous if initially the laser modification region is generated, and the laser marking is then formed at least partially within the laser modification region.
  • the laser marking and the laser modification region are preferably generated for a plurality of individual uses on data carriers on a sheet or a roll.
  • the laser modification region in step c) is generated in this case with a shape and size that is matched to the size of the register variations, according to claim 15.
  • the first or second printed image can be produced by any suitable printing method, in particular with the above-mentioned, under a printed image also a blind embossing, preferably generated in non-inked intaglio, should be understood.
  • register marks in particular pass lines or register marks, are printed on the sheet or roll in step a) together with the printed images whose positions in step b) are recorded as a measure of the position of the printed images.
  • an associated registration mark is printed for each printed image, the position of which is detected in step b) as a measure of the position of the associated printed image.
  • the detection can be done only in one spatial direction, such as the direction of movement of the sheet or the role, or in two spatial directions.
  • passport marks are advantageously used as pass marks, in the first case pass lines suffice.
  • an associated registration mark is printed in each case for a group of printed images, for example for a payload line, whose position in step b) is used as a measure of the position of the printed images of the assigned Group is detected.
  • the lower cost is faced with a lower detection accuracy.
  • the position of the registration marks in step b) can advantageously also be detected by imaging sensors, in particular by line scan cameras or area cameras.
  • the imaging sensors can also detect the positions of the printed images from characteristic features of the printed images, ie without the use of registration marks.
  • data of the print images can be read by the imaging sensors in step b) and the information content of the laser marking can be determined on the basis of these data.
  • laser markings with information content determined in this way are then generated in the individual components.
  • an infrared laser in the wavelength range of 0.8 .mu.m to 3 .mu.m, in particular a Nd: YAG laser is used with advantage.
  • the laser beam in marking becomes expedient at a speed of more than 1000 mm / s, preferably more than 2000 mm / s, more preferably about 4000 mm / s or more over the backing substrate guided.
  • Fig. 1 shows a schematic representation of a banknote 10, which is provided with a security element 12 in the form of a coin.
  • the security element 12 has a circular printed image 14, which is printed by means of screen printing technique with a metallic color, such as a silver color, on the banknote substrate.
  • the security element 12 is further provided with a laser marking 16, for example a serial number, which runs along the curve of the printed image 14.
  • a laser marking 16 for example a serial number
  • additional graphic motifs or alphanumeric elements which are incorporated in US Pat Fig.1 are not shown.
  • the laser-generated motifs of the coin 12 can be repeatedly applied to the banknote to increase the security against counterfeiting with other techniques, for example as a steel engraving motif or as a watermark.
  • the printed image 14 and the laser marking 16 are in perfect register with each other.
  • the invention provides two ways to achieve this Passerhaltmaschine.
  • Fig. 2 shows in (a) a security element 20 with an oval printed image 22, which is provided with a laser marking 24. Because of the above-described register fluctuations between the print image and the laser marking, the alphanumeric marking 24 does not exactly follow the rounding of the print image 22. Although the magnitude of the deviation in Fig. 2 (a) is shown exaggerated for illustration, the human eye is very sensitive to such deviations, especially in round or rounded elements, so that even relatively small deviations can emerge disturbing.
  • the security element as in Fig. 2 (b) shown, additionally provided with a print image partially overlapping laser modification region 26, which forms a peripheral edge of the print image 22 contour.
  • the printing ink of the printed image is removed or converted into a transparent modification.
  • the laser modification region 26 stands in the perfect register to the laser marking 24, since it is generated with this in the same operation by the same laser marker and controlled by the same computer.
  • the removal of the ink can be done by the laser beam is directed directly to the ink and from the side on which the ink is applied.
  • the laser beam can also act on the rear side, ie on the surface of the substrate facing away from the printing ink, and achieve the desired effects on the side of the substrate on which the printing ink is located.
  • the order in which the laser marking 24 and the laser modification region 26 are generated is basically arbitrary. As explained below, it may be advantageous, depending on the desired effect, first to generate the laser marking 24 or first the laser modification region 26.
  • the print image 22 to be provided with the laser marking can be exposed or surrounded by adjacent print images.
  • the printing inks of the adjacent printed images for the laser radiation are transparent, so that depending on the laser parameters used in the generation of the laser modification region 26 there is no or a tactile mark.
  • FIGS. 3 to 5 show further embodiments of security elements according to the invention with perfect registration between print image and laser marking.
  • Fig. 3 shows, in the same reference numerals as in Fig. 2 Denote the same elements, the principle described can also be applied to security elements 20 with complicated shapes.
  • a decorative edge 28 can also be generated around the printed image 22 by suitable control of the laser writer. Visually dominates the full-surface interior of the printed image, so that here too the impression 22 of a perfect pass between printing image and laser marking.
  • the laser marking 24 can, as in the embodiment of the Fig. 4 also be led beyond the edge of the printed image 22, where it causes a marking effect in the data carrier substrate, such as a blackening 30.
  • a marking effect in the data carrier substrate such as a blackening 30.
  • special contrast effects can be generated.
  • the overlapping with the print image 22 marking part 32, in which only the ink is removed and the remaining laser energy is not sufficient to blacken the substrate, white against the silver or gold-colored background of the print image 22, while the laser action outside the print image 22 to a Blackening 30 of the otherwise bright substrate material leads.
  • the laser modification region is advantageously first created to ensure that the location of the contrast or color change coincides with the edge of the remaining print image.
  • the impression of a registration of printed image and laser marking is created by the fact that in the print image or in the substrate of the data carrier with a first parameter set of the laser writer a two-dimensional change is created, and then in the thus generated laser modification region with a second parameter set passerhaltig a laser marking is produced with a different from the area change effect.
  • the planar change may, for example, consist in a removal of paint or color components, a whitening or bleaching.
  • the line pressure pattern 40 is lightened in the laser modification region 42 and, in the register, a tactile marking 44 is produced at a significantly higher laser intensity.
  • the planar change 42 in the print pattern 40 can also leave a print image area 46, in which then the laser marking 44 is generated.
  • the laser beam can be performed on the front as well as on the back of the substrate.
  • the coordinates of the elements to be marked can also be detected more accurately.
  • the distances 54-1, 54-2, 54-3 ... (in the x-direction) and 58-1, 58-2, 58-3 ... (in the y-direction) between the elements to be marked of the sheet are determined individually on the quiescent sheet and entered into the laser scribe control unit to compensate for changes in the length and / or width of the sheet 50.
  • the position measurement can be carried out individually for rows and rows or even for each benefit, whereby spacings 52-i, 54-i1, 54-i2, 54-i3,..., For the i-th payload line in x- Direction, and distances 56-j, 58-j1, 58-j2, 58-j3, ..., for the j-th benefit series in y-direction.
  • the procedure described above can also be used according to the invention for producing a data carrier with a security element having two print images, in which the two print images initially have certain register fluctuations.
  • Fig. 7 shows in (a) two successively printed on a data carrier substrate printed images 60 and 62 with Passerschwankept 64.
  • the two print images 60, 62 overlapping laser modification region 66 is generated in its overlap region 68 with the print images, the ink of the respective print image 60th or 62 is removed, as in Fig. 7 (b) shown.
  • the laser parameters are chosen so that the data carrier substrate outside the overlap area 68 is not changed. Remains thus in the Fig. 7 (c) It will be understood that this method can also be applied to more than two printed images.
  • the printed images can be applied to the front and / or back.
  • registration variations between the printed images of a sheet or a roll and the respective laser marks are avoided by sensing the positions of the printed images or certain elements of the printed images, and generating the laser marks based on the detected positions.
  • the basic procedure is in the block diagram of Fig. 8 illustrated.
  • the process begins at reference numeral 80, where sheet feeding into the machine occurs.
  • the sheets 82 each containing a plurality of individual utilities on data carriers, are processed at a given web or bow speed 84.
  • the speed is about 10,000 sheets / hour, which, depending on the embodiment, corresponds to web speeds of 2 m / s to about 3.5 m / s. Such web speeds are also achieved when processing web-shaped materials.
  • the coordinates of preprinted registration marks or specific locations in the printed image of the individual items are detected (reference numeral 86) and forwarded to a computing unit 88 for determining the marking positions.
  • the arithmetic unit 88 drives a laser scribe 90, described in more detail below, to apply the laser marks in the correct positions within the print image of each individual use.
  • the marked sheets are output at reference numeral 92.
  • Fig. 9 schematically shows the scan head 100 of a vector laser marker, with which the security element 102 of a single use with a laser marking 104 is provided.
  • An infrared laser beam 106 is deflected by two movable mirrors 108, one of the mirrors producing the deflection in the x direction, the other mirror generating the deflection in the y direction.
  • a plan field lens 110 focuses the laser beam 106 onto the security element 102, where it generates the laser marking 104 and optionally also a laser modification region in the manner described above.
  • the security element 102 with the data carrier substrate moves at a certain speed v during the marking process. This speed is detected by sensors (reference numeral 84 in FIG Fig. 8 ) and to the computer 88 ( Fig. 8 ) to control the movement of the mirrors 108 to compensate for the substrate velocity v in the label.
  • the marking method can therefore be used particularly advantageously for contactless identification of documents of value, which are processed at high speeds, as usual in printing shops.
  • the security elements 102 of a sheet can, for example, also be marked by means of a matrix of punctiform emerging laser beams or by means of beams of larger cross-section, which are partially covered by a template.
  • Such templates can be executed automatically changeable. If entrainment of the radiation in accordance with the substrate speed is not possible or undesirable, identification of moving substrates is also possible by selecting a short exposure time. Also the beam guidance by polygon mirror is possible.
  • sources of radiation include CO 2 lasers, Nd: YAG lasers or other laser types in the wavelength range from UV to to the far infrared in question, the laser often work also advantageous with frequency doubling or tripling.
  • laser sources are used in the near infrared, since this wavelength range fits well with the absorption properties of the data carrier substrates and printing inks used.
  • the spot size of the laser radiation can be varied from a few micrometers to a few millimeters, for example by changing the distance between the plane field lens 110 and the security element 102. Spot sizes of around 100 ⁇ m are preferably used.
  • the continuous power of the laser inscribers used is typically between a few watts and a few 100 watts.
  • Nd YAG lasers can be operated with laser diodes for lower overall power with smaller dimensions and high beam quality, or with pump lamps for high output.
  • the laser markings or laser modifications are advantageously carried out with very fast moving galvanometers, which guide the beam at more than 1000 mm / s, preferably up to 4000 mm / s and more across the substrate can. At these marking speeds, only a small proportion of energy is deposited per distance in the substrate or the security element 102, so that advantageous lamp-pumped Nd: YAG lasers with a power of about 100 watts are used.
  • the marking results can be varied widely.
  • the laser in addition to the partial or complete removal or the partial or complete modification of color or effect layers also other markings, such as blackening in the data carrier substrate, or even tactile markings are generated with a relief structure.
  • Such tactile markings preferably have a height of 30 to 100 microns.
  • the markings are made, for example, with an Nd: YAG laser whose fundamental wavelength 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 about 100 microns and the travel speeds of the laser beam over the substrate 250 to 4000 mm / s.
  • Fig. 10 shows a laser marker 120 in which a sheet 122 is provided with a plurality of lasers simultaneously with a laser mark and a laser modification area.
  • the sheet 122 has six columns and six rows, so that 36 single-use 124 are arranged on bills or other data carriers on this sheet.
  • a laser tube 126 is arranged above the printed sheet 122 and, together with the associated scanning head 128, generates the laser markings or modifications in the individual slots 124 arranged in this column.
  • the throughput can be greatly increased, since not a single laser beam must be moved over the entire sheet, but only a scan field between the columns of the sheet is applied.
  • the application of the individual benefits takes place as with Fig. 9 described about the deflection of the laser radiation by means contained in the scan heads 128 mirrors.
  • an associated registration line 136 is printed on the sheet 130 for each row of single-use 132 with print images 134 to be marked.
  • a print mark or contrast mark sensor detects pass line 136 before laser marking and controls the y coordinate of the mark accordingly.
  • the pass line 136 is printed in the printing process to be appropriately lasered so that it is subjected to the same registration variations as the print images 134 of the utility line. If the print sheet is changed in the row direction in its length, for example by drying or rolling, this can be taken into account and compensated for by the detection of the position of the pass lines 136 for the associated print images 134.
  • an assigned pass line can also be printed for each individual benefit.
  • the pass lines can then be individually recorded and evaluated for each benefit row, whereby a higher accuracy is achieved in non-uniform change of the y-coordinate over the row direction x, for example by non-uniform drying or trapezoidal Auswalzung.
  • Fig. 12 shows a sheet 140, in which for each individual use 142 an associated registration cross 146 is printed. This allows the position of the print images 144 in the row direction x to be determined in addition to the y coordinate.
  • the scanning light beam can be guided, for example, by means of a polygon wheel transversely to the direction of movement of the sheet, the smallest possible trajectories are selected to avoid inaccuracies.
  • the scanning in the x-direction, but also in the y-direction, can also be carried out with the aid of imaging sensors, for example with a CCD or CMOS line scan camera.
  • the image refresh rate of such sensors is high enough to be able to record each individual benefit despite the high web speeds.
  • one row per benefit row is advantageously used, as indicated by the dashed line scan cameras 150 in FIG Fig. 12 indicated.
  • the read-out single lines can either be processed directly, or assembled into pictures with the aid of a clock, which is determined by the speed measurement of the sheets, and then evaluated.
  • the evaluation is done with special hardware and / or software, in particular digital signal processors and PGA (Programmable Gate Array) - modules are suitable. Because of the short shutter speeds required, it is advisable to have very bright and well-adjusted lighting, such as flashlamps, synchronized with the image input.
  • line scan cameras 150 it is also possible to use surface cameras which receive two-dimensional information. In this way, the printed image of the overall appearance can be detected. In order to achieve a high resolution and thus a good accuracy of the registration, it also makes sense here to use a surface camera per benefit row. In particular, here offer CMOS cameras, as these at high resolution achieve high repetition rates and support fast signal processing well. Otherwise, the above statements apply with regard to the signal processing and the illumination.
  • imaging sensors are used for position determination, they can additionally read data of the printed image, which determine or co-determine the information content of the laser marking.
  • a camera may read a letter-printed number sequence of the print image and the read data may be used to generate a corresponding matrix code of equal information content and to introduce it as a laser mark into the print image of that single benefit.
  • the information content of the laser mark can only be derived from the read information content, and for example, represent a check digit for the read digit, or repeat part of the read digit.

Claims (23)

  1. Support de données avec un élément de sécurité (20) qui présente une image d'impression (22) et un marquage laser (24) superposé au moins partiellement à l'image d'impression, certaines variations de repère existant entre l'image d'impression et le marquage laser,
    caractérisé en ce que l'élément de sécurité présente, en plus du marquage laser, une zone de modification laser (26) superposée au moins partiellement à l'image d'impression, zone qui est un repère par rapport au marquage laser, et dans la zone de superposition (28) à l'image d'impression de laquelle l'aspect visuel de l'image d'impression est modifié sous l'effet d'un faisceau laser,
    le support de données n'étant pas modifié visuellement en-dehors de la zone de superposition entre la zone de modification laser et l'image d'impression,
    le marquage laser et la zone de modification laser ne coïncidant pas,
    la zone de modification laser formant un contour à largeur prédéterminée périphérique sur le bord de l'image d'impression, et la largeur prédéterminée du contour périphérique étant adaptée à l'ampleur des variations de repère entre l'image d'impression et le marquage laser, de sorte que toutes les variations de repère apparaissant typiquement sont compensées et que lors de l'observation de l'élément de sécurité, on obtient l'impression visuelle d'un repère parfait du marquage laser et de la partie encore visible de l'image d'impression.
  2. Support de données selon la revendication 1, caractérisé en ce que l'image d'impression est imprimée par sérigraphie, impression offset ou impression en relief.
  3. Support de données selon l'une au moins des revendications 1 à 2, caractérisé en ce que l'image d'impression est une couche à effets.
  4. Support de données selon la revendication 3, caractérisé en ce que la couche à effets se compose de métal, d'une couleur métallique ou d'une couleur contenant des pigments de couche d'interférence.
  5. Support de données selon la revendication 3 ou 4, caractérisé en ce que la couche à effets est de couleur bronze, cuivrée, argentée ou dorée.
  6. Support de données selon l'une au moins des revendications 1 à 5, caractérisé en ce que l'image d'impression est réalisée avec une forme ovale ou circulaire, en particulier avec une forme représentant une pièce de monnaie.
  7. Support de données selon l'une au moins des revendications 1 à 6, caractérisé en ce que l'image d'impression forme un motif, en particulier un motif à lignes, tel par exemple un motif guilloché.
  8. Support de données selon l'une au moins des revendications 1 à 7, caractérisé en ce que le marquage laser est réalisé sous la forme de motifs, symboles ou codages.
  9. Support de données selon l'une au moins des revendications 1 à 8, caractérisé en ce que, dans la zone de superposition entre le marquage laser et l'image d'impression, l'aspect visuel de celle-ci est modifiée sous l'effet d'un faisceau laser.
  10. Support de données selon l'une au moins des revendications 1 à 9, caractérisé en ce que, dans au moins l'une des zones de superposition entre le marquage laser et la zone de modification laser avec l'image d'impression, la couleur d'impression de celle-ci et partiellement ou complètement enlevée sous l'effet d'un faisceau laser.
  11. Support de données selon la revendication 10, caractérisé en ce que l'image d'impression est blanchie ou décolorée dans au moins l'une des zones de superposition.
  12. Support de données selon la revendication 10 ou 11, caractérisé en ce que les propriétés optiques de l'image d'impression sont modifiées de manière irréversible dans au moins l'une des zones de superposition.
  13. Support de données selon l'une au moins des revendications 1 à 12, caractérisé en ce que le support de données présente, en-dehors de la zone de superposition entre la zone de modification laser et l'image d'impression, un marquage tactile avec une structure en relief.
  14. Support de données selon l'une au moins des revendications 1 à 13, caractérisé en ce que l'on prévoit, en-dessous de l'image d'impression, une couche colorée, en particulier une couche colorée de sécurité, laquelle est mise à nue, activée ou désactivée dans au moins l'une des zones de superposition sous l'effet du faisceau laser.
  15. Procédé pour la fabrication d'un support de données avec un élément de sécurité (20), dans lequel
    a) une image d'impression (22) est imprimée sur un substrat de support de données,
    b) un marquage laser (24) se superposant au moins partiellement à l'image d'impression étant produit sous l'effet d'un faisceau laser, certaines variations de repère existant entre l'image d'impression et le marquage laser, et
    c) en plus du marquage laser, sous l'effet d'un faisceau laser, en repère avec le marquage laser, une zone de modification laser (26) se superposant au moins partiellement à l'image d'impression étant produite, dans la zone de superposition (28) à l'image d'impression de laquelle l'aspect visuel de l'image d'impression est modifié, le support de données n'étant pas modifié visuellement en-dehors de la zone de superposition entre la zone de modification laser et l'image d'impression, le marquage laser et la zone de modification laser ne coïncidant pas,
    la zone de modification laser étant produite sous la forme d'un contour périphérique d'une largeur prédéterminée autour du bord de l'image d'impression et à l'étape b), le marquage laser étant produit avec certaines variations de repère entre l'image d'impression et le marquage laser et à l'étape c), la zone de modification laser étant produite avec une largeur prédéterminée du contour périphérique adaptée à l'ampleur des variations de repère, de sorte que toutes les variations de repère apparaissant typiquement sont compensées et que lors de l'observation de l'élément de sécurité fabriqué, on obtient l'impression visuelle d'un repère parfait du marquage laser et de la partie encore visible de l'image d'impression.
  16. Procédé selon la revendication 15, caractérisé en ce que l'image d'impression est imprimée par sérigraphie, impression offset ou impression en relief.
  17. Procédé selon l'une au moins des revendications 15 ou 16, caractérisé en ce que le marquage laser et la zone de modification laser sont produits lors de la même étape de travail avec le même marqueur laser.
  18. Procédé selon l'une au moins des revendications 15 à 17, caractérisé en ce que le marquage laser et/ou la zone de modification laser sont produits avec des paramètres de faisceau laser qui varient, de sorte que l'on obtient des effets différents ou des intensités d'effet différentes.
  19. Procédé selon l'une au moins des revendications 15 à 18, caractérisé en ce que l'on produit tout d'abord la zone de modification laser, et le marquage laser étant ensuite produit au moins partiellement à l'intérieur de la zone de modification laser.
  20. Procédé selon l'une au moins des revendications 15 à 19, caractérisé en ce que le marquage laser et la zone de modification laser sont produits pour une pluralité de copies individuelles de supports de données sur une feuille ou un rouleau.
  21. Procédé pour la fabrication d'un support de données avec un élément de sécurité, dans lequel
    a) une première image d'impression (60) est imprimée sur un substrat de support de données,
    b) une deuxième image d'impression (62) étant imprimée sur le substrat de support de données, les deux images d'impression présentant certaines variations de repère (64), et
    c) sous l'effet d'un faisceau laser, une zone de modification laser (66) se superposant au moins partiellement aux deux images d'impression étant produite, dans la zone de superposition (68) avec les images d'impression de laquelle l'aspect visuel de l'image d'impression respective est modifié, le substrat de support de données n'étant pas modifié visuellement en-dehors de la zone de superposition entre la zone de modification laser et les images d'impression, la zone de modification laser s'étendant le long du bord des deux images d'impression, la zone de modification laser étant produite avec une forme et une dimension adaptées à l'ampleur des variations de repère de manière à obtenir une transition de repérage entre les deux images d'impression.
  22. Procédé selon l'une au moins des revendications 15 à 21, caractérisé en ce que, pour la production du marquage laser et/ou de la zone de modification laser, on utilise un laser infrarouge dans la plage de longueurs d'onde de 0,8 µm à 3 µm, en particulier un laser Nd:YAG.
  23. Procédé selon l'une au moins des revendications 15 à 22, caractérisé en ce que, lors du marquage, le faisceau laser est guidé au-dessus du matériau de support de données avec une vitesse de plus de 1000 mm/s, de préférence de plus de 2000 mm/s, de manière particulièrement préférée d'environ 4000 mm/s ou plus.
EP05763045.1A 2004-08-06 2005-07-28 Support de donnees a element de securite, et son procede de production Not-in-force EP1776674B1 (fr)

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PL05763045T PL1776674T3 (pl) 2004-08-06 2005-07-28 Nośnik danych mający element zabezpieczający oraz sposób jego wytwarzania

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DE102004038542A DE102004038542A1 (de) 2004-08-06 2004-08-06 Datenträger mit Sicherheitselement und Verfahren zu seiner Herstellung
PCT/EP2005/008217 WO2006015733A1 (fr) 2004-08-06 2005-07-28 Support de donnees a element de securite, et son procede de production

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EP1776674B1 true EP1776674B1 (fr) 2015-03-18

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EP (1) EP1776674B1 (fr)
CN (1) CN1993714B (fr)
CA (1) CA2573414A1 (fr)
DE (1) DE102004038542A1 (fr)
PL (1) PL1776674T3 (fr)
RU (1) RU2384884C2 (fr)
WO (1) WO2006015733A1 (fr)

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Also Published As

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DE102004038542A1 (de) 2006-02-23
RU2384884C2 (ru) 2010-03-20
CN1993714B (zh) 2012-11-21
CN1993714A (zh) 2007-07-04
PL1776674T3 (pl) 2015-08-31
US20070274559A1 (en) 2007-11-29
CA2573414A1 (fr) 2006-02-16
US8251404B2 (en) 2012-08-28
EP1776674A1 (fr) 2007-04-25
RU2007107481A (ru) 2008-09-20
WO2006015733A1 (fr) 2006-02-16

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