EP2539154A1 - Dispositif de marquage et procédé de marquage coloré de documents de valeur et de sécurité - Google Patents

Dispositif de marquage et procédé de marquage coloré de documents de valeur et de sécurité

Info

Publication number
EP2539154A1
EP2539154A1 EP11705874A EP11705874A EP2539154A1 EP 2539154 A1 EP2539154 A1 EP 2539154A1 EP 11705874 A EP11705874 A EP 11705874A EP 11705874 A EP11705874 A EP 11705874A EP 2539154 A1 EP2539154 A1 EP 2539154A1
Authority
EP
European Patent Office
Prior art keywords
laser light
color
value
marking
document
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
EP11705874A
Other languages
German (de)
English (en)
Other versions
EP2539154B1 (fr
EP2539154B9 (fr
Inventor
Helmut Wurm
Steffen Baudach
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.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bundesdruckerei GmbH filed Critical Bundesdruckerei GmbH
Priority to PL11705874T priority Critical patent/PL2539154T3/pl
Publication of EP2539154A1 publication Critical patent/EP2539154A1/fr
Publication of EP2539154B1 publication Critical patent/EP2539154B1/fr
Application granted granted Critical
Publication of EP2539154B9 publication Critical patent/EP2539154B9/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B42D25/41—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
    • B41J2/447—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 arrays of radiation sources
    • B41J2/45—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 arrays of radiation sources using light-emitting diode [LED] or laser arrays
    • B41J2/451—Special optical means therefor, e.g. lenses, mirrors, focusing means
    • 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
    • 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
    • B41M5/34—Multicolour thermography
    • 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
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B7/00—Machines, apparatus or hand tools for branding, e.g. using radiant energy such as laser beams
    • B44B7/007—Machines, apparatus or hand tools for branding, e.g. using radiant energy such as laser beams using a computer control means
    • 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
    • B41M5/267—Marking of plastic artifacts, e.g. with laser
    • B42D2033/20—
    • B42D2035/24—

Definitions

  • the invention relates to a method for multicolor marking value or security documents and a marking device, which are designed for a permanent colored marking a value or security document by means of laser light.
  • Security documents are those documents and objects that are protected by at least one security feature or security element against a
  • Security documents that embody a value are also referred to as value documents.
  • Security documents include, for example, identity documents, driver's licenses or motor vehicle papers and documents of value, with value documents, for example banknotes, postage stamps or checks.
  • security documents or value documents it is advantageous to be able to mark these permanently, preferably individually.
  • Different methods are known from the prior art, with which value and / or security documents can be marked individually.
  • most value and security documents have been paper-based and, in particular, have been customized by means of printing techniques, modern security documents and value documents are often at least partially made from plastic materials.
  • Modern identity cards and driving licenses are used, for example, as lamination bodies made of several layers of plastic and
  • Plastic layers to be later marked with a laser added special pigments. These do not affect transparency in the visible optical range or are not or barely perceptible to a user. If such a layer is irradiated with laser light of sufficient intensity, an increased absorption of the laser light occurs at the pigments. This makes it possible to use energy in the otherwise couple transparent plastic, which then on the amount of energy deposited here to a local coloring, for example via a
  • Heating and a partial carbonization of the plastic material leads.
  • a degree of blackening of the plastic can be set in a targeted manner. From individual local pixels, patterns, in particular
  • a full-color marking should be possible, which can represent colors from a gamut, which is spanned by preferably three primary colors, such as red, blue and green.
  • a card-shaped data carrier consisting of at least one layer in which visually readable information in the form of a change in the optical properties due to an irreversibly caused by a laser beam material change are introduced, the absorption capacity of this layer for at least a wavelength due to the laser radiation is at least partially reduced.
  • original colored or opaque layers are "bleached" in terms of absorption.
  • DE 30 48 733 A1 discloses an identification card and a method for producing such an identification card with information applied in the form of patterns
  • the ID card has differently colored, stacked on at least one surface
  • Personalization data is interrupted. It is envisaged that the information by the action of a controlled laser beam on one or more on a
  • Plastic carrier one above the other applied color layers are displayed. As a result of the laser irradiation, the color can be changed locally.
  • a method for producing an object with a colored mark by irradiating the surface of the object with laser light in the form of the mark, wherein the object consists of a plastic composition in at least the area where the mark is applied that at least contains three color-forming components that lose their color-forming ability under the influence of laser light selected and present in a concentration such that at each wavelength between 400 and 700 nm at least a portion of the amount of incident light is absorbed for the character one or more colors are selected, the wavelength of the laser light in the sequence is set to a value depending on the selected color, and then the surface of the object is irradiated with the laser light.
  • WO 01/28778 A2 discloses a method for applying colored characters on a data carrier, preferably made of plastic, known by means of a laser system, wherein in at least one surface layer and / or near-surface layer of the data carrier introduced latent pigments in which by energetic excitation a Changing the absorption behavior is carried out at the designated areas of the data carrier by laser irradiation, which is in the IR and / or visible range, energetically excited in such a way that the same pigments
  • a method for writing data, in particular personalization data, on and / or in a data carrier by means of electromagnetic radiation is known, wherein the method any data carrier is provided on and / or in which at least one colorant at least is provided locally, and this colorant is irradiated by means of the electromagnetic radiation of at least one wavelength range, so that there is a change in color of the colorant by bleaching in the region of the irradiation, wherein the color change can be determined by machine and / or by a human eye.
  • near-surface layer has at least two different coloring particles that change the color of this layer under the influence of laser radiation
  • the laser radiation is used with at least two different wavelengths to to change the color of this layer
  • At least one beam guiding means is provided for guiding a first laser beam having the wavelength ⁇ and at least one further laser beam having a wavelength ⁇ 2 , which is different from the wavelength of the first laser beam, via the two-coordinate beam deflecting means and the focusing means to the layer of the object.
  • Zweikoordinatenstrahlablenk is proposed an arrangement of two mutually perpendicular axes rotatably mounted deflecting mirror.
  • a focusing is done by a fixed plan field optics. Since the light does not pass through the planar field optics on the optical axis, chromatic aberration effects occur in the focusing device. In particular, if differently colored laser light is used for marking, this requires a complex compensation.
  • the data carrier comprises a visually or machine recognizable marking in the form of a pattern of letters, numbers or pictures.
  • a data carrier with a data carrier substrate is provided and a marking layer is applied to the data carrier substrate.
  • the marking is introduced into the marking layer by means of short laser pulses.
  • the color mixture changes, so that locally creates a desired color impression.
  • the practical problem of the prior art methods is to achieve high-contrast intense hues.
  • the invention is based on the object, an improved method and an improved device for permanent color marking of value or
  • the basic idea of the invention is the marking of the value and / or
  • Laser light pulses have a pulse duration of less than 100 picoseconds, preferably less than 10 picoseconds. This makes it possible to make the interaction with the material of the document body or the colorants contained therein so that a change of the material and / or the colorant wholly or largely takes place without a thermal interaction. Since the coupling of the energy occurs in a short time window and the process caused by the interaction proceeds so quickly that no or only a very small dissipation of the energy takes place in the form of heat away from the interaction site, the change is well localized. Adjacent to the interaction site, there is no change in the material of the security or security document or the colorants contained therein. This possibility of targeted local marking for the purpose of local
  • a security element is a structural unit comprising at least one security feature.
  • a security element can be an independent structural unit which can be connected, for example glued, to a security document, which can also be a value document. It can also be an integral part of a security document.
  • An example of the former is a so-called holopatch (a hologram-containing patch for example, a hologram film section) or a visa stickable to a security document.
  • An example of the latter is an identification document
  • a security feature is a structure that is only producible or reproducible with (compared to simple copying) increased effort or not at all unauthorized, or makes forgery and / or falsification visually and / or mechanically recognizable.
  • a credit card for example, represents a security document protected by security features and security elements against counterfeiting and adulteration, which does not directly represent a value beyond the pure material value of the card, but makes it possible to dispose of large assets.
  • a pulsed laser is a laser that, in contrast to a continuous wave or CW laser that continuously emits laser light, emits laser light in temporally limited portions called pulses.
  • a short pulse laser is understood here a laser that generates light pulses whose pulse duration is less than 100 picoseconds.
  • the literature also speaks in part of ultrashort laser pulses, with no uniform definition for this. Ultrashort pulses are pulses whose pulse duration is less than 10 picoseconds.
  • An optical fiber is a fiber of a transparent material to whose
  • Total internal reflection can be a conduit of light inside the fiber.
  • a fiber laser is a laser whose active medium in which light-induced emission of electromagnetic radiation occurs is an optical fiber.
  • a pattern typically consists of a multiplicity of juxtaposed pattern units or pixel dots. The pattern units or pixels of a pattern are assigned to each other and arranged laterally in a defined manner,
  • a representation such as an image, a symbol, a logo, a lettering (letters, numbers, alphanumeric characters) or a code (e.g., a bar code).
  • An individualization pattern is a pattern that is used for individualization.
  • a pixel may include a plurality of sub-pixels, each of which is monochrome and determine a coloration of the pixel as a whole via a color addition or color subtraction.
  • Individualizing is a pattern when it is unique to a person or a person
  • a code individualizing a group of persons within the total population of a country is the city of residence.
  • An individualizing for a person code for example, the number of the identity card or passport photo.
  • individualizing code is the value. Individualizing for a banknote is the serial number. Non-individualizing is a pattern that is identical for all elements of an entity. For bills this is for example a coat of arms, which is printed on all banknotes.
  • a basic pattern is an arrangement of monochromatic areas or sub-areas thereof, which, with suitable modification of the color of the areas or
  • Subareas allow a mark of a multicolor pattern over it.
  • Colored is an entity that causes a color impression when viewed by a human.
  • Multicolor is an entity that produces at least two distinguishable color impressions.
  • Monochrome is an entity when it produces a single color impression.
  • Colorants are all entities that are responsible for causing a
  • Wavelength range are responsible.
  • the light of a Planckian radiator, which produces a continuous spectrum in the visible wavelength range, is regarded here as white light.
  • Natural sunlight is an example of white light.
  • Providing a marking device which at least one laser light source for generating laser light and
  • a light guide device coupled to the laser light source so that a focus of the laser light of the laser light source is controllably positionable on or in the document body of the value or security document;
  • the laser light used for marking is irradiated by means of short or ultrashort laser pulses having a plus duration of less than 100 ps or less than 10 ps.
  • a marking device for multi-colored marking of value or
  • a light guide device coupled to the laser light source such that
  • Laser light of the laser light source can be positioned in a controlled manner on a value or security document
  • the laser light source is a short pulse laser source or ultrashort pulse laser source that generates laser pulses having a pulse duration of less than 100 ps or less than 10 ps.
  • the achievable resolution in the method according to the prior art with respect to the marking produced is usually limited by the fact that the interaction between the laser light and the value or Security document based on thermal effects. This can be explained by the
  • Irradiation of the laser light comprises both the repeated irradiation of light several times successively at the same focus position relative to the document body and a repeated irradiation of light, wherein in each case the position of the focus relative to the material to the surface of the document body and / or perpendicular to the surface of the document body varies becomes.
  • a variation of the focus position perpendicular to the document surface alters a selection of a plane parallel to the surface of the document body in which the focus is positioned.
  • An embodiment of the invention thus provides that the local change in the color of a region is made via a non-linear interaction with the irradiated laser light.
  • At least three regions of different colors are provided together in a basic pattern of nested sub-regions or arranged in the basic pattern when provided.
  • the at least three areas can thus be divided into many, usually regularly arranged sub-areas.
  • the subregions having the same color are considered.
  • the subregions may be two-dimensional area or three-dimensional volumes.
  • such a basic pattern can be printed by printing using different inks on a substrate layer.
  • the sub-areas on different substrate layers so imprint that the sub-areas of the various substrate layers from which the document body by stacking the substrate layers and subsequent assembly, for example in a lamination process, each other, with respect to a viewing direction parallel to the lamination direction, not or substantially not overlap.
  • the document body comprises at least three areas
  • Bayerpattern represent. This makes it possible to mark a pattern composed of regularly arranged pixels which, with regard to the usable colors, can use almost the entire perceptible color space.
  • the subregions are optimally adapted to the sensitivity of the human eye, so that over a maximum of four markings of subregions, one image pixel each can be generated which produces any color impression from the gamut spanned by the primary colors causes.
  • this is or
  • Bayerpattern printed on a substrate layer surface This is or is preferably formed as an inner substrate layer surface, so that a manipulation is difficult.
  • the colored areas in the form of layers which overlap one another in a planar manner are introduced into the document body or are thus introduced during the provision.
  • the markings are made by removing material.
  • cavities are introduced into the document body from the surface. A depth of the cavities in the document body determines which
  • the cavities can be formed so close to each other that the remaining material does not cause color degradation of the entire marked pattern as in the prior art. Because the edge surfaces of the cavities can be formed smoothly and perpendicularly to the surface of the document body (with perpendicular irradiation of the laser light), web widths of the document body remaining between adjacent cavities can be minimized. As a result, intense color patterns can be generated which are not impaired by the color of the web areas.
  • the local change in the color of a region can be achieved by changing the colorant causing the color by means of the non-linear interaction
  • Particularly short laser pulses with pulse durations in the range of less than 10 can picoseconds, preferably in the range of 100 femtoseconds to 10
  • Picoseconds with a fiber laser.
  • fiber lasers Compared with other solid state lasers fiber lasers have the advantage that they can be constructed very compact and have a high electro-optical efficiency. In addition, fiber lasers are much more modest in terms of adjustment and handling than most known solid state lasers.
  • a preferred embodiment of the method therefore provides that the marking via a non-linear optical effect in the value or
  • the light-guiding device comprises a relative to the value and / or security document movably mounted optical fiber, which is coupled to at least one drive means so that the laser light via a movement of an exit surface of the optical fiber in a positioning plane relative to the value and / or security document laterally on the value or
  • Security document is positionable.
  • the laser light of the laser light source is thus guided by means of an optical fiber and a positioning of the laser light on the value or security document to be marked is effected by moving the
  • the laser light used for marking with a suitable orientation of the positioning plane relative to a surface of the security document, preferably parallel thereto, each at the same angle, preferably perpendicular, to the value and / or
  • Security document incident and beyond a path length of the traveled light path is the same regardless of the illuminated lateral position on the security and / or security document. This makes it possible to focus the laser light used stronger and yet to use an identical focus extension at the marking at all lateral positions of the value or security document. Problems that are known due to a slightly different direction of irradiation in the guide devices of the prior art, can thus be avoided.
  • a focusing optics can be used.
  • a focusing optics if used, with the respective exit surface of the Pairing optical fiber. This means that the focusing optics by means of
  • the advantage is that the light path through the focusing optics is the same in each case, regardless of the position on or in the value or security document that is being marked.
  • the focusing takes place by means of the Kerr effect.
  • the focal length of the material of the focusing lens changes due to the non-linear interaction of the electromagnetic radiation with the material of the lens.
  • the focal length of the lens is inversely proportional to the intensity of the lens
  • the light guide is performed by means of an optical fiber
  • a movement of the exit surface of the optical fiber is possible to vary a light path between the exit surface and a surface of the document. This can be used to vary a focus position within the value or security document.
  • Such a change in direction can be achieved, for example, in one embodiment in that the exit surface, from which the laser light is rectilinearly guided on the document surface, in addition to the movement in the positioning plane, which is parallel to the surface of the value or security document, perpendicular to the Positioning level or the surface of the value or security document is movable.
  • Positioning a security document can change the light path
  • the exit surface of the optical waveguide in addition to the elements of the imaging and / or focusing optics, such as a deflection mirror, in the positioning plane is relatively movable.
  • a positioning laterally on the document via a movement of the exit surface together with the imaging and / or focusing optics is possible and additionally by a relative movement of the
  • the focusing optics consists of a
  • the piezoelectric material By applying tension, the material can be deformed and thus the focal length of the material can be adjusted.
  • the laser light source is integrated in the optical fiber.
  • any coupling losses are reduced in the coupling into the fiber.
  • a compact and simple construction is possible.
  • Solid-state lasers for example Ti: sapphire lasers
  • fiber laser systems require no expensive cooling and achieve a high electro-optical efficiency.
  • laser light can be transmitted via a parametric tuning with the same hardware
  • the light guiding device comprises at least one further movable, preferably even more, further movably mounted optical fibers. This makes it possible, at the same time at several points or at the same time with different wavelengths of light to attach a mark on the security or security document or in the value or
  • each optical fiber can be provided with a focusing optics adapted to the corresponding wavelength of light. It should be noted that with pulse durations of more than 10 ps it is still possible to speak of a defined wavelength. At pulse lengths shorter than 10 ps, the spread due to the Heisenberg uncertainty principle is significant. Thus, the blur at a pulse of 10 ps is about 0.41 meV, which corresponds to about 0.12 nm at a wavelength of 620 nm (2 eV). At pulse durations of 10 fs, the blur is about 0.41 eV, which means at a wavelength of 620 nm (2 eV) that the bandwidth is at least 125 nm.
  • the exit surface of the at least one optical fiber is positionable relative to the at least one further optical fiber or optionally relative to the plurality of exit surfaces of the plurality of optical fibers in the positioning plane. Particularly preferred are the plurality
  • optical fibers or their exit surfaces in the positioning plane individually driven and positioned relative to each other. It goes without saying for the person skilled in the art that there are mechanical residual actions since the optical fibers can not penetrate one another and thus can not be arranged at one and the same position at the same time.
  • the focus position within the value or security document along a normal to the surface of the value or security document can be set individually for the latter in one embodiment. This can be targeted markings in different levels or layers, from which the value or security document is joined, are introduced. Preferably, this is controlled possible.
  • Fig. 1 is a schematic representation of a marking device for value or
  • FIG. 2 shows a schematic representation of a document body for introducing a colored marking
  • FIG. 3 is a schematic representation of a marked document body
  • Fig. 5 is a schematic representation of a basic pattern
  • Fig. 6 shows another embodiment of a marking device.
  • FIG. 1 schematically shows a marking device 1 for the permanent marking of a value or security document 2.
  • the value document 2 is on a
  • Bracket 3 is arranged. This can be supplied to the value or security document 2 by means of a transport device 4 and / or removed from it. In some embodiments, it is possible that the transport device 4 forms the holder 3.
  • the person skilled in various devices for transporting value or security documents are known. In general, the marking of the value or security document 2 is carried out after this is completed except for the mark still to be attached. However, it is also possible to make the marking before the value or security document 2 is completely finished, for example, before it is separated from a sheet or a strip.
  • the marking device 1 comprises a laser light source 5.
  • the laser light source 5 is designed to generate laser light 6.
  • the laser light source 5 is a pulsed light source.
  • it may be a solid state laser, e.g. a Ti: sapphire laser, act.
  • the laser light 6 In order to mark the value or security document 2, the laser light 6 must be aimed at the value or security document 2, i. on the surface 7 or inside the value or security document 2, are positioned.
  • a light guide device 8 is provided.
  • the light-guiding device 8 comprises an optical fiber 9, into which the laser light 6 is coupled. An exit surface 10 of the optical fiber 9 is moved in a positioning plane 1 1.
  • the positioning plane 1 1 is formed parallel to the surface 7 of the value or security document 2 in a preferred embodiment.
  • the optical fiber 9 is coupled to a drive device 12.
  • the drive device 12 comprises in the illustrated embodiment an X-axis actuator 13, a Y-axis actuator 14 and a Z-axis actuator 15. These are connected and aligned so that the X-axis actuator movement of the exit surface 10 of the optical fiber 9 parallel to a X-axis 16, the Y-axis actuator 14 parallel to a Y-axis 17 and the Z-axis actuator 15 parallel to a Z-axis 18 causes. It should be noted that a movement parallel to the Z-axis causes a change in the positioning plane 1 1.
  • the exit surface 10 in the positioning plane 1 1 effects a lateral alignment and positioning of the laser light 6 'emerging from the exit surface 10 or the focal point 19 formed thereof. It should be noted that other embodiments may have and use differently configured light guiding devices.
  • an imaging and / or focusing optics 20 is coupled to the exit surface 10 of the optical fiber 9. This is moved with the exit surface 10 of the optical fiber.
  • the exit surface 10 of the optical fiber is configured so that the exiting laser light 6 'is focused and no or supplemental focusing optics are necessary.
  • the introduced at the respective position in the value or security document amount of energy which can be varied for example via a pulse intensity or a number of introduced at the same position light pulses, the color of the mark or its color impression caused regulated.
  • the drive device 12 Via the drive device 12 it is possible to make a marking vectorially (but broken down into individual pixels (marking points)) or in a grid.
  • a distance 27 of the positioning plane 1 1 from the surface 7 or the value or security document 2 need not be varied in some applications in the marking. Then, a positioning device 8 which comprises only one X-axis actuator 13 and one Y-axis actuator 14 is sufficient. It is understood by those skilled in the art that for the positioning of the exit surface 10 of the optical fiber 9 in the
  • Positioning level 1 1 also a set of actuators can be used, which no
  • Positioning level 1 1 must not be able to be positioned in all embodiments so that all points on the surface of the document with the exiting laser light 6 'can be illuminated.
  • the laser light need only be positionable to those positions on the asset or security document at which markings
  • FIG. 2 shows an exemplary embodiment of a document body 40 of a value or security document 2 which is suitable for introducing a colored marking.
  • the document body 40 is formed as a lamination body.
  • the films 41-46 are all made of the same thermoplastic material, such as polycarbonate or polyvinylchloride. Additional security elements may be inserted between the foils 41 to 46. In addition, individual or all foils may be printed.
  • the black film 42, the blue film 43, the green film 44, and the red film 45 each represent monochrome areas each having a different color from the others.
  • Blue, red, green represent the basic colors of an RGB color system.
  • the gamut of the RGB color system makes it possible to display full-color objects.
  • a black foil is additionally provided.
  • CYM (K) color system For example, using a cyan yellow magenta (black) color system (CYM (K) color system) one would use a cyan film instead of the blue film 43, a yellow film instead of the green film 44 and a yellow film instead of the red film 45
  • magenta foil use magenta foil.
  • the films 41-45 are opaque. As a result, a color space comparable to the normal printing systems is clamped, since only the uppermost color layer is always visible. As a result, standard systems can be used to optimize the color space.
  • a transparent embodiment of the films 41 -45 is a corresponding
  • a document body 40 is shown similar to that of FIG.
  • the same technical features are identified by the same reference numerals throughout the application.
  • the document body 40 contains a barrier film 47 instead of the cover film 46 over the red film 45. This is, for example, opaque and white.
  • a protective film 48 is arranged, which after the colored
  • Marking for example, is laminated.
  • the document body 40 appears white when viewed under natural daylight (white light).
  • cavities 51 - 54 are introduced into the different films 47, 45,
  • a depth of the cavities 51 - 54 defines which color impression a surface 7 has locally at the location / position of the respective cavity 51 - 54.
  • the cavities 51 and 54 in each case extend completely through the white barrier film and into the red film 45. Thus, a red color impression is imparted locally.
  • the cavity 52 ends in the green foil, so that locally a green color impression is mediated.
  • the cavity 53 terminates in the blue film 43. All overlying films are completely pierced. It is generated locally a blue color impression.
  • the depth of the cavity can be selected via a choice of the energy deposited via one or more short or ultrashort laser pulses, a choice of the depth of focus, an adaptation of the wavelength of the laser pulse (s) to the color of the respective film to be removed.
  • a cross-sectional shape of the cavities can be controlled by a choice of beam profile as well as a sidewall shape of the cavities. Factors influencing this are the depth of focus and the defocusing of the laser beam and optionally an im
  • Focusing or defocusing of the beam may result. Due to the short pulse duration and the achievable high light intensities nonlinear interactions can be exploited, so that in the
  • Document body 40 no thermal effects occur, which lead to a dissipation of energy in the document body and in this case to less precisely defined Kavticiansqueritessformen.
  • Remaining webs 58 between the cavities 52-54 are thus viewed from the surface 7 of area small, so that a high density of points and thus resolution of the information shown on the marks is possible.
  • the remaining lands affect a color intensity less than in the prior art. It is understood that for a macroscopic flat color impression of a viewer, the color addition or color subtraction of the individual cavities 51-54
  • the subsequently applied protective film 48 protects the cavities 51 -54 during use of the document body 40 as a value or security document 2. Also, introducing further cavities to falsify the value or security document 2 is at least made more difficult because it also damages the protective film 48 would effect.
  • the shape of the beam profile can be used to achieve a focus which is smaller than the focusing of the laser light. This will be explained below with reference to FIG. 4.
  • the individual components of the marking device are controlled by a controller 22, so that the marking is carried out automatically.
  • the controller 22 is only supplied with data containing the pattern for the mark, so that the corresponding areas of the value or security document 2 are irradiated with a corresponding laser light intensity to effect the corresponding marking in the value or security document 2.
  • the embodiment of FIG. 1 is characterized in that the laser light 6 as a pulsed laser light with short pulse durations of less than 100 ps, preferably of less than 10 ps is generated. This is an exploitation of non-linear optical effects for introducing the markings on or in the value or
  • Light guide device 8 and the value or security document 2 are kept low. This can be selected in the range from contact to a few cm, preferably 0.2 to 10 mm. This makes it possible to form the beam guide strongly divergent and to focus sharply. Both across the beam direction
  • Propagation direction of the laser light 6 'improved resolution can be achieved when marking.
  • micro-writing can be realized with a character size in the range of a few micrometers.
  • a so-called beam profile 61 in focus is shown schematically.
  • a light intensity I is plotted against the position r transversely to the propagation direction (z-direction in FIG. 1), (r is chosen, for example, parallel to the x-axis according to FIG. 1).
  • r is chosen, for example, parallel to the x-axis according to FIG. 1.
  • a beam profile 61 of the laser light 6 1 (according to FIG. 1) in the focus 19 (according to FIG. 1) has a Gaussian profile. Since nonlinear interactions are dependent on the square I 2 62 of the intensity I of the laser light, that is to say a so-called I 2 dependency, the non-linear one is found at a suitably chosen pulse intensity
  • the focal extent of the marking is determined by an extension 65 of the core region 63 and not by the extent 66 of the focus 19 of the laser light 6 ', which corresponds to the extent of the beam profile 61.
  • the regions having different colors are introduced into the document body in the form of subregions. The sub-areas are arranged so that these sub-areas at a
  • a surface of the document body form a predetermined pattern.
  • a Bayer pattern 81 can be used as the given pattern, which is shown by way of example in section in FIG. 5.
  • four subregions 83 are provided in each case.
  • a sub-area 83-r is red and a sub-area 83-b is blue, two sub-areas 83-g1, 83-g2 are green.
  • the individual subregions 83 are preferably arranged in a plane of the document body parallel to a surface of the document body.
  • the subregions 83 may be printed on a surface.
  • Subareas are arranged in the register and give the given pattern.
  • Colored marking is accomplished by modifying the subregions 83 for their color by means of short or ultrashort laser pulses of less than 100 ps or less than 10 ps, preferably 100 fs-10 ps.
  • the sizes and the distances of the individual subregions 83 can be selected such that they are smaller than the focus size of the laser light pulses.
  • a targeted modification of the sparkle, for example by removing the ink causing the colouration or by "destroying" the colourant-causing pigments in the corresponding subregion, can be achieved by utilizing non-linear interactions the optical focusing of the laser light to obtain and exploit enhanced focusing of the interaction region.
  • information in the form of micro-writing can be color-coded into a value or security document for individualizing it.
  • FIG. 6 another embodiment of a marking device 1 is shown schematically.
  • the illustrated embodiment differs from that of FIG. 1 in that the light guide device 8 in this embodiment two
  • Optical fibers 9, 9 ' comprises. These are respectively coupled to a drive device 8 or 8 ', which are formed analogously to the drive device 8 according to FIG.
  • This embodiment offers the advantage that the value or security document 2 can be marked simultaneously or quasi simultaneously at several locations.
  • the laser light source 5 is shown schematically in this embodiment as a fiber laser 23 with a seed laser 24 and an amplifier ring 25. It will be understood by those skilled in the art that another source of laser light may be used with it
  • Embodiment can be used. Likewise, a fiber laser 23 as
  • Laser light source 5 are used in the embodiment of FIG. 1.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un dispositif de marquage (1) pour un document de valeur ou de sécurité (2) ainsi qu'un procédé de marquage multicolore durable, en particulier individuel, de documents de valeur et/ou de sécurité (2). Le procédé de marquage coloré durable d'un document de valeur ou de sécurité (2) comprend les étapes: production d'un corps (40) de document qui comprend des zones de couleur différente, les zones individuelles étant respectivement unicolores; production d'un dispositif de marquage qui comprend au moins une source de lumière laser (5) pour générer de la lumière laser (6) et un dispositif de guidage de lumière (8, 8') qui est couplé à cette source de lumière laser (5) de sorte qu'un foyer (19) de la lumière laser (6) de la source de lumière laser (5) peut être positionné de manière contrôlée sur ou dans le corps (40) de document de valeur ou de sécurité (2); positionnement ciblé itératif du foyer (19) sur ou dans le corps (40) de document et émission de la lumière laser (6') pour modifier de manière localement ciblée une ou plusieurs des zones de sorte que le corps (40) de document donne ensuite à un observateur humain une impression multicolore lorsqu'il est irradié avec de la lumière blanche, la lumière laser (6) étant émise par des impulsions laser courtes ou ultracourtes qui présentent une durée d'impulsion de moins de 100 ps ou de moins de 10 ps. De ce fait, des interactions non linéaires entre le matériau du document de valeur ou de sécurité (2) et la lumière laser (6') peuvent être utilisées pour le marquage. Cela permet d'utiliser ou de produire une meilleure focalisation de la lumière laser (6') et en outre une densité plus élevée des marquages colorés déterminant la coloration de sorte qu'une intensité de couleur plus élevée est réalisable.
EP11705874.3A 2010-02-26 2011-02-25 Procédé de marquage coloré de documents de valeur et de sécurité Active EP2539154B9 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11705874T PL2539154T3 (pl) 2010-02-26 2011-02-25 Sposób barwnego znakowania dokumentów wartościowych lub zabezpieczonych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010010072A DE102010010072A1 (de) 2010-02-26 2010-02-26 Markierungsvorrichtung und Verfahren zum farbigen Markieren von Wert- oder Sicherheitsdokumenten
PCT/EP2011/052802 WO2011104331A1 (fr) 2010-02-26 2011-02-25 Dispositif de marquage et procédé de marquage coloré de documents de valeur et de sécurité

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EP2539154A1 true EP2539154A1 (fr) 2013-01-02
EP2539154B1 EP2539154B1 (fr) 2014-08-06
EP2539154B9 EP2539154B9 (fr) 2014-12-10

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DE (1) DE102010010072A1 (fr)
PL (1) PL2539154T3 (fr)
WO (1) WO2011104331A1 (fr)

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GB2567811A (en) * 2017-10-19 2019-05-01 De La Rue Int Ltd Security devices, security articles, security documents and methods for their manufacture
GB2570434A (en) * 2017-10-19 2019-07-31 De La Rue Int Ltd Security documents and methods of manufacture thereof

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DE102012211767B4 (de) 2012-07-05 2014-03-13 Bundesdruckerei Gmbh Sicherheitsdokumentenrohling für eine farbige Laserpersonalisierung, Verfahren zur Herstellung eines Sicherheitsdokuments mittels farbiger Laserpersonalisierung eines Sicherheitsdokumentenrohlings und Sicherheitsdokument.
ITTO20130088A1 (it) * 2013-02-04 2013-05-06 K4B S R L Procedimento di marchiatura laser, sigillo identificativo, in particolare sigillo anticontraffazione, o codice di accesso realizzato mediante tale procedimento, e sistema e procedimento di controllo anticontraffazione
DE102013016079A1 (de) * 2013-09-29 2015-04-02 Norbert Taufenbach Redundante Lasermarkiereinheit
CN103586578B (zh) * 2013-11-14 2016-08-31 苏州图森激光有限公司 一种材料表面激光黑化或着色方法
DE102015208297A1 (de) 2015-05-05 2016-11-10 Bundesdruckerei Gmbh Personalisierungsvorrichtung und Verfahren zur Personalisierung eines Dokuments
AT521847A1 (de) 2018-11-09 2020-05-15 Hueck Folien Gmbh Verfahren zur Herstellung eines Sicherheitsmerkmals
DE102022208882A1 (de) 2022-08-26 2024-02-29 Bundesdruckerei Gmbh Farbige Laserpersonalisierung mit hoher Farbsättigung

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GB2567811A (en) * 2017-10-19 2019-05-01 De La Rue Int Ltd Security devices, security articles, security documents and methods for their manufacture
GB2570434A (en) * 2017-10-19 2019-07-31 De La Rue Int Ltd Security documents and methods of manufacture thereof

Also Published As

Publication number Publication date
EP2539154B1 (fr) 2014-08-06
PL2539154T3 (pl) 2014-11-28
WO2011104331A1 (fr) 2011-09-01
DE102010010072A1 (de) 2011-09-01
EP2539154B9 (fr) 2014-12-10

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