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EP2539155B1 - Dispositif de marquage et procédé de marquage haute résolution de documents de valeur ou de sécurité - Google Patents

Dispositif de marquage et procédé de marquage haute résolution de documents de valeur ou de sécurité Download PDF

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Publication number
EP2539155B1
EP2539155B1 EP11707385.8A EP11707385A EP2539155B1 EP 2539155 B1 EP2539155 B1 EP 2539155B1 EP 11707385 A EP11707385 A EP 11707385A EP 2539155 B1 EP2539155 B1 EP 2539155B1
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EP
European Patent Office
Prior art keywords
security document
valuable
laser light
laser
security
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.)
Active
Application number
EP11707385.8A
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German (de)
English (en)
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EP2539155B9 (fr
EP2539155A1 (fr
Inventor
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
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Publication date
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Publication of EP2539155A1 publication Critical patent/EP2539155A1/fr
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Publication of EP2539155B1 publication Critical patent/EP2539155B1/fr
Publication of EP2539155B9 publication Critical patent/EP2539155B9/fr
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Classifications

    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method for marking value or security documents and a marking device, which are designed for permanently marking a value or security document with the aid of laser light.
  • Security documents are those documents and objects that are protected by at least one security feature or security element against corruption and / or unauthorized copying.
  • 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 driver's licenses are joined together, for example, as lamination bodies comprising a plurality of plastic layers and optionally one or more paper layers.
  • the plastic layers which consist for example of polycarbonate, special pigment substances at least in individual layers, which are to be marked later with a laser added. 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.
  • a degree of blackening of the plastic can be set in a targeted manner. From individual local pixels, patterns, in particular grayscale images, lettering and other characters, can be permanently marked in the value or security document.
  • a card-shaped data carrier consisting of at least one layer in which visually readable information in the form of a change in optical properties due to an irreversibly caused by a laser beam material change are introduced, the absorption capacity of this layer for at least one wavelength due to the laser radiation at least partially is reduced.
  • original colored or opaque layers are "bleached" in terms of absorption.
  • an identification card and a method for producing such an identification card with information applied are known in the form of patterns, for example letters, numbers and / or images.
  • the identification card has layer areas of different colors arranged one above the other on at least one surface, which are at least partially interrupted by visually recognizable personalization data. It is envisaged that the information is displayed by the action of a controlled laser beam on one or more on a plastic carrier superimposed color layers. As a result of the laser irradiation, the color can be changed locally.
  • WO 01/28778 A2 is 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, which takes place by energetic excitation, a change in the absorption behavior of the for the character provided areas of the disk by laser irradiation, which is in the IR and / or visible range, energetically excited such that the same pigments color change takes place and that after the color change of the laser-irradiated latent pigments, not excited by laser irradiation latent pigments be energetically excited in such a way by irradiation with light waves in the UV wavelength range, that in the so-irradiated pigments colorlessness is brought about.
  • 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 is provided at least locally, and this colorant is irradiated by the electromagnetic radiation of at least one wavelength range, so that there is a change in the 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.
  • a method for applying colored information to an object wherein the article has at least in a near-surface layer at least two different coloring particles that change the color of this layer under the influence of laser radiation, wherein the laser radiation is used with at least two different wavelengths,
  • the application of laser radiation to the object in the vector and / or raster method via a Zweikoordinatenstrahlablenk issued and a focusing device for focusing the laser radiation is applied to the layer of the object.
  • At least one beam guiding means is provided for generating a first laser beam with the wavelength ⁇ 1 and at least one further laser beam having a wavelength ⁇ 2 , which is different from the wavelength of the first laser beam, to lead to the layer of the object via the two-coordinate beam deflection device and the focusing device.
  • the two-coordinate beam deflection device an arrangement of two mutually perpendicular axes mounted deflecting mirror is proposed.
  • 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.
  • a security marker in a transparent polymer is known.
  • the security mark includes a visually invisible diffraction structure inside a transparent polymer, which is produced by multiphoton absorption using ultrashort pulses of a femtosecond laser.
  • the diffraction structure is generated in the volume of the polymer via refractive index changes. The extents of the refractive index change are in the submicrometer range.
  • structures can be generated via multiphoton ablations, the extension of which also lies in the submicrometer range.
  • a readout of the diffraction structure is done with low-power lasers and can be done in transmission or reflection.
  • the US 2010/0040836 A1 describes a system and method for marking transparent plastic with pulsed femtosecond, picosecond or nanosecond lasers.
  • the US 2005/0001419 A1 shows a method of color laser engraving a document having a surface layer and a plurality of sublayers.
  • the sublayers include different colors and orientations of ink.
  • a laser creates openings in the Surface layer to expose colored ink in one of the sub-layers.
  • the various orientations of the colored ink include circular, linear and overlapping groupings of ink.
  • the sublayers have repeating groupings.
  • the marking methods known from the prior art which are visually perceptible, it is necessary to dope the plastic material to be marked during the manufacturing process, to apply or incorporate paints or pigments, at least if no material removal from the surface of the security document is intended.
  • the pigments to be ablated are generally mixed with pigments or other additives which facilitate laser light absorption.
  • the technique usually limits an achievable resolution with regard to the marking produced by the fact that the interaction between the laser light and the value or security document is based on thermal effects.
  • the basic idea of the invention is to carry out the marking of the value and / or security document with laser light, which is generated by a short-pulse laser source.
  • the individual laser light pulses used for marking have a pulse duration of less than 100 picoseconds, preferably less than 10 picoseconds.
  • An advantage of using short-pulse laser light is that intensity densities can be achieved with this light, which can also trigger non-linear optical interactions. This makes it possible, for example, to produce markings with a higher resolution, since thermal interaction processes, which are always associated with a dissipation of the heat into surrounding areas and cause a resolution limitation over it, can be avoided.
  • it is also possible to mark materials which are not specially prepared for laser marking for example via pigment additives or the like.
  • Nonlinear effects are exploited here. This gives a greater material independence in the marking.
  • diffractive structures can be marked directly in documents. It should be emphasized that a visual impairment of areas adjacent to the introduced markings is omitted. Focusing of the laser light can be carried out particularly advantageously so that an interaction with material takes place only in focus. Thus, a precise introduction of markings perpendicular to a document surface possible. It is also possible to introduce markings one above the other, ie in different levels of a document. With such markings, patterns can be produced which are perceptible in a lateral view. For example, a height of a focused area is preferably about 50 ⁇ m.
  • the low damage is also due to the fact that in non-linear processes, which have a quadratic dependence on the intensity (I 2 dependence), an interaction outside of a focus drops very rapidly. Markings applied near the surface may be made tactile, ie be designed for tactile sensing.
  • 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 patch, such as a hologram film portion) adhered to a bill, or a visa stickable to a security document.
  • An example of the latter is a diffractive surface relief embossed in an identity document.
  • a security feature is a structure which can only be produced or reproduced with increased effort (not in comparison to simple copying) or not at all unauthorized, or makes a forgery or falsification visually and / or mechanically recognizable.
  • security documents are merely exemplified called identity cards, passports, ID cards, access control cards, visas, tax stamps, tickets, driver's licenses, motor vehicle papers and documents of value, which include banknotes, checks, postage stamps and credit cards, and any smart cards and adhesive labels (eg for product security).
  • Security documents which also embody a value, are also referred to as value documents. A sharp distinction between these two terms is often not possible.
  • 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 made of a transparent material, at the interface of which total reflection can cause conduction of light in the interior of 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 associated with each other and arranged laterally in a defined manner, typically in one or two dimensions, and give the overall view of a representation, such as a picture, a symbol, a logo, a lettering (letters, numbers, alphanumeric characters) or a code (eg a barcode).
  • An individualization pattern is a pattern that is used for individualization.
  • Individualizing is a pattern when it is unique to a person or an object or a group of persons or objects from a largest set of persons or objects. For example, 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. One for a group of bills within the total amount of bills 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 marking device for value or security documents which comprises at least one laser light source and a light guide device which is coupled to the laser light source so that light of the laser light source can be positioned controlled on a value or security document, wherein the laser light source is a short pulse laser source Laser pulses with a pulse duration of less than 100 picoseconds, preferably less than 10 picoseconds produced.
  • the short laser pulses interact via non-linear optical effects with material of the value or security document to be marked.
  • a change in color for example, a blackening in different shades of gray, of transparent plastic materials is possible.
  • a doping with color pigments, which is necessary in the prior art in order to make the films "laserable" is no longer necessary.
  • a preferred method for permanently marking a value or security document thus comprises the steps of generating laser light and guiding the laser light by means of a light-guiding device so that laser light emerging from the light-guiding device is positioned on the security or security document and locally marks the security or security document , wherein the laser light is generated in the form of laser light pulses with a pulse duration of less than 100 picoseconds, preferably less than 10 picoseconds.
  • markings are generated in the register in different levels in the document.
  • at least a part of the markings are arranged one above the other perpendicular to the surface of the security document.
  • Markers that are marked in different planes parallel to the surface of the value or security document in the value or security document can be used, for example, to display different information for different viewing directions by the markings of the different levels completely or partially in the different viewing directions cover.
  • different layers, from which the value or security document is optionally joined together can be linked to one another in terms of information technology. Individual layers can thus be exchanged or falsified only with difficulty without changing the overall information provided by the three-dimensionally introduced marking.
  • 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 much more modest in terms of adjustment and handling than most known solid-state lasers.
  • An advantage of using short laser pulses with pulse durations of less than 100 picoseconds, preferably less than 10 picoseconds, is that a very precise spatial confinement of the interaction zone between the laser light and the material of the asset or security document is achievable when non-linear optical interaction effects can be used to form the label.
  • a preferred embodiment of the method therefore provides that the marking is triggered via a non-linear optical effect in the value or security document.
  • 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 light via a movement of an exit surface of the optical fiber in a positioning plane relative to the value - And / or security document can be positioned laterally on the value or security document.
  • the light of the laser light source is thus guided by means of an optical fiber, and a positioning of the light on the value or security document to be marked takes place by moving the exit surface of the optical fiber relative to the value or security document.
  • the light used for the marking with a suitable orientation of the positioning plane relative to a surface of the security document, preferably parallel thereto, in each case 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 equal regardless of the illuminated lateral position on the security and / or security document.
  • the security and / or security document is movably mounted relative to the optical fiber. Construction and use are analogous to that of the moving optical fiber.
  • both the light guide device comprises a relative to the security and / or security document movably mounted optical fiber as well as the security and / or security document is movable relative to the optical fiber. It is particularly preferred that the security and / or security document is movable along a transport direction and that the optical fiber is movable in a direction orthogonal to the transport direction, parallel to the surface of the security and / or security document to be personalized.
  • a focusing optics can be used. It is preferred, a focusing optics, if used, to couple with the respective exit surface of the optical fiber. This means that the focusing optics is moved by means of the drive device together with the exit surface of the optical fiber.
  • 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 position of the focus in the document is varied. This means that the focus position along a normal to a plane surface of the document or a plan idealized surface of the value or security document, if this has a surface relief or other unevenness, at the same lateral position or at different lateral positions on the value or security document is varied.
  • markings are made in different levels of the value or security document. These can be arranged one above the other or laterally offset, in each case arranged relative to the surface of the preferably card-shaped value or security document.
  • the focusing is done 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 electromagnetic radiation in a Gaussian radiation profile.
  • 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 path change may be achieved by having the exit surface, from which the light is guided linearly on the document surface, in addition to the movement in the positioning plane, which is parallel to the surface of the security document Positioning level or the surface of the value or security document is movable.
  • a change in the light path may occur in some embodiments, for example be achieved that the exit surface of the optical waveguide in addition relative to 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 exit surface relative to the imaging and / or focusing optics in the positioning plane a change in the focus position perpendicular to Surface of the value or security document possible.
  • the focusing optics consists of a 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 do not require expensive cooling and achieve a high electro-optical efficiency.
  • laser light of different wavelengths can be generated by parametric tuning with the same hardware. This is effective with fiber lasers.
  • the light guide device comprises at least one further movable, preferably even more movable 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 bring in the value or security document. If different wavelengths of light are used, then each optical fiber can have one to the corresponding wavelength of light be fitted adjusted focusing optics. 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.
  • 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).
  • 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.
  • the plurality of optical fibers or their exit surfaces are individually driven in the positioning plane and can be positioned relative to one another. 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 number of optical fibers is selected such that upon a relative movement of the entirety of the optical fibers along a spatial direction, the entire value or security document or at least one strip of the security or security document can be marked with a two-dimensional / three-dimensional pattern.
  • the optical fibers can be arranged rigidly relative to one another along a line or any other arrangement.
  • an optical modifying element is coupled or integrated with the at least one optical fiber, via which the decoupled light can be modified in terms of its frequency and / or intensity. This is particularly advantageous when the light guide device comprises a plurality of further optical fibers. These then preferably also each have an optical modifying element associated with the fiber.
  • the light energy generated by a laser light source is generally sufficient to mark the document at several points at the same time, in one embodiment it is provided that the light from the one laser light source is directed into the at least one laser light source Optical fiber and the at least one further or optionally a plurality of further optical fibers is coupled. Even with such an embodiment, it is advantageous if the individual optical fibers are each assigned an optical change element. It is understood that embodiments are also advantageous, which comprise a plurality of laser light sources whose light is coupled in each case in one or more of the several further optical waveguides.
  • the focus position within the value or security document along a normal to the surface of the security or value 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.
  • a marking device 1 for permanently marking a value or security document 2 is shown.
  • the value document 2 is arranged on a holder 3.
  • This can be supplied to the value or security document 2 by means of a transport device 4 and / or removed from it.
  • the transport device 4 forms the holder 3.
  • the person skilled in various devices for transporting value or security documents are known.
  • the marking of the value or security document 2 is carried out after this is completed except for the mark still to be attached.
  • 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.
  • the laser light 6 has to be positioned in a targeted manner on the value or security document 2, ie on its surface 7 or in the interior of the value or security document 2.
  • 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 11.
  • the positioning plane 11 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 of the positioning plane 11.
  • 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 type of marking for example, a blackening in terms of a gray level, regulated. 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 11 from the surface 7 or the value or security document 2 need not be varied in many applications in the marking.
  • a positioning device 8 comprising only an X-axis actuator 13 and a 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 plane 11, a set of actuators can be used, which cause no movements parallel to the coordinate axes, but in cooperation are able, the exit surface 10th in the positioning plane 11 laterally flat at different locations to position.
  • the light exit surface 10 in the positioning plane 11 need not be positionable in all embodiments so that all points on the surface of the document can be illuminated with the exiting laser light 6 '.
  • the laser light only needs to be positionable at those positions on the asset or security document at which markings are to be made. Is only a limited range of value or Security document provided for a mark, as well as an adapted to this area positioning range 26, in which the exit surface 10 of the optical fiber 9 is positioned.
  • a modifying element is integrated with or coupled to the optical fiber 9.
  • the modification element 21 can be designed, for example, as an electro-optical or acousto-optical modulator or switch.
  • the amount of energy supplied locally and, for example, a blackening in gray levels can be controlled individually.
  • 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 according to Fig. 1 is characterized in that the laser light 6 is generated as a pulsed laser light with short pulse durations of less than 100 ps, preferably less than 10 ps.
  • the laser light 6 is generated as a pulsed laser light with short pulse durations of less than 100 ps, preferably less than 10 ps.
  • a path length 27 between the light guiding device 8 and the value or security document 2 can be kept small. 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 transverse to the beam direction (propagation direction) as well as along the beam direction thus a very narrow focus can be achieved.
  • a so-called beam profile 61 in focus is shown schematically.
  • a light intensity l is plotted against the position r transversely to the propagation direction (z direction in FIG Fig. 1 ). (r, for example, becomes parallel to the x-axis according to Fig. 1 chosen.)
  • a beam profile 61 of the laser light 6 '(acc Fig. 1 ) in focus 19 (after Fig. 1 ) has a Gaussian profile.
  • the nonlinear interaction takes place only in the core region 63 of the steel profile, in which the square I 2 62 the intensity I of the beam profile 61 exceeds a threshold value 64.
  • 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.
  • a further embodiment of a marking device 1 is shown schematically.
  • the illustrated embodiment differs from that according to Fig. 1 in that the light-guiding device 8 in this embodiment comprises two optical fibers 9, 9 '. These are correspondingly respectively coupled to a drive device 8 or 8 ', which analogously to the drive device 8 according to Fig. 1 are formed.
  • 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 laser light source may be used with this embodiment. Likewise, a fiber laser 23 as a laser light source 5 in the embodiment according to Fig. 1 be used.
  • the emerging from the laser light source 5 light 6 is either a beam splitter (not shown) divided and coupled into the optical fiber 9, 9 'simultaneously or alternately coupled via an electro-optical or electro-acoustic switch in the optical fibers 9, 9'. Since the mechanical movement speed of the exit surfaces 10, 10 'via the drive means 8, 8' are usually limited, can at a suitable selected repetition rate of the laser light 6, 6 'even at maximum movement speed of the exit surfaces 10, 10' is a mark of the value or Security document 2 take place, even if every second laser pulse in the other optical fiber 9, 9 'is coupled. In this case, marking is still considered to be simultaneous or quasi-simultaneous.
  • a further embodiment of a marking device 1 is shown schematically.
  • two laser light sources 5, 5 ' are provided. This makes it possible in a simple manner, at different locations with different repetition rates, wavelengths, etc. to introduce markers on or in the value or security document 2.
  • Fig. 4 schematically the exit surfaces 10 of another embodiment of a marking device are shown schematically, in which a plurality of optical fibers 9 are coupled to each other via a drive means together relative to the value or security document 2 movable.
  • each of the optical fiber 9 is preferably coupled to a modifying element (not shown) so that the respective coupled-in laser light intensity and / or laser frequency can be controlled via each optical fiber 9.
  • a fiber laser system can be used to achieve higher electro-optical efficiencies.
  • the required energy can be significantly reduced.
  • the entire structure can be made much more compact, so that fitting into a production line or plant is much easier.
  • laser marking systems can also be deployed remotely.
  • a focus positioning ie a positioning of the focal point parallel to the Z-axis, analogous to the geometry of Fig. 1 is described.
  • the embodiment comprises an imaging and focusing optics 20, which comprises a focusing lens 31 and a deflection mirror 32.
  • a focusing actuator 33 is provided.
  • a relative movement between the deflecting mirror 32 and the exit surface 10 of the optical fiber 9 can be effected. This changes the focus position along the Z-axis.
  • the imaging and focusing device 20 will be moved together with the exit surface 10 of the optical fiber in the positioning plane 11, which coincides with the XY plane, to laterally position the laser light 6 'on the value or security document.
  • a movement of the light exit surface 10 in the positioning plane 11 is effected via the sieraktor 33, but only the distance changed to the deflecting mirror 32 and this the focus position perpendicular to the positioning plane.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Credit Cards Or The Like (AREA)
  • Laser Beam Processing (AREA)

Claims (15)

  1. Dispositif de marquage (1) destiné à des documents de valeur ou de sécurité, comprenant
    au moins une source de lumière laser (5),
    un dispositif de guidage de lumière, qui est couplé à la source de lumière laser de sorte que la lumière laser (6) de la source de lumière laser puisse être positionnée de manière commandée sur un document de valeur ou de sécurité (2),
    la source de lumière laser (5) étant une source laser à impulsions courtes, laquelle génère des impulsions laser présentant une durée d'impulsion inférieure à 100 ps, caractérisé en ce
    qu'une position focale peut varier dans le document de valeur ou de sécurité (2) de manière perpendiculaire par rapport à la surface (7) du document de valeur ou de sécurité (2), afin de générer, dans le document de valeur ou de sécurité (2), des marquages (71) dans le registre dans divers plans (72 - 78).
  2. Dispositif de marquage (1) selon la revendication 1, caractérisé en ce que la source de lumière laser (5) comprend un laser à fibre (23).
  3. Dispositif de marquage (1) selon la revendication 1 ou 2, caractérisé en ce que le dispositif de guidage de lumière (8) comprend une fibre optique (9) installée de manière mobile par rapport au document de valeur ou de sécurité (2), laquelle est couplée à au moins un système d'entraînement (12) de telle sorte que la lumière laser (6') peut être positionnée dans un plan de positionnement (11), de manière latérale sur le document de valeur ou de sécurité (2), par l'intermédiaire d'un mouvement de la surface de sortie (10) de la fibre optique (9).
  4. Dispositif de marquage (1) selon la revendication 3, caractérisé en ce que la surface de sortie (10) de la au moins une fibre optique (9) peut être déplacée par rapport à la surface (17) du document de valeur ou de sécurité (2) de telle sorte qu'une position focale (19) de la lumière laser (6') peut varier à l'intérieur du document de valeur ou de sécurité (2).
  5. Dispositif de marquage (1) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la lumière laser (6) présente un profil de rayonnement de forme gaussienne, et qu'une lentille focalisante entraîne la focalisation au moyen de l'effet Kerr, sachant que la distance focale du matériau de la lentille focalisante se modifie sur la base de l'interaction non linéaire du rayonnement électromagnétique avec le matériau de la lentille inversement de manière proportionnelle à l'intensité du rayonnement électromagnétique.
  6. Dispositif de marquage (1) selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la position focale peut varier dans le document de valeur ou de sécurité (2) de manière perpendiculaire par rapport à la surface (7) du document de valeur ou de sécurité (2) afin de marquer l'un sur l'autre, par la même surface (7), dans le document de valeur ou de sécurité (2), au moins deux marquages (71) réalisés séparément l'un de l'autre, de manière perpendiculaire par rapport à la surface (7) du document de valeur ou de sécurité (2).
  7. Procédé servant à marquer de manière durable un document de valeur ou de sécurité (2), comprenant les étapes suivantes consistant à :
    générer de la lumière laser (6) et
    guider la lumière laser (6) au moyen d'un dispositif de guidage de lumière (8) de manière à positionner sur le document de valeur ou de sécurité (2) la lumière laser (6') sortant du dispositif de guidage de lumière, et
    de manière à marquer localement le document de valeur ou de sécurité (2), et
    à générer de la lumière laser (6) sous la forme d'impulsions de lumière laser présentant une durée d'impulsion inférieure à 100 ps,
    caractérisé en ce
    qu'une position focale (19) de la lumière laser (6') varie à l'intérieur du document de valeur ou de sécurité (2) afin de générer dans le document de valeur ou de sécurité (2), des marquages (71) dans le registre dans divers plans (72 - 78).
  8. Procédé selon la revendication 7, caractérisé en ce que la lumière laser (6) est guidée au moyen d'une fibre optique (9) et qu'un positionnement de la lumière laser (6') est effectué sur le document de valeur ou de sécurité (2) à marquer par l'intermédiaire d'un mouvement de la surface de sortie (10) de la fibre optique (9) par rapport au document de valeur ou de sécurité (2).
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que la lumière laser (6) est générée au moyen d'un laser à fibre (23).
  10. Procédé selon l'une quelconque des revendications 7 à 9, caractérisé en ce que les marquages (71) réalisés dans divers plans dans le registre sont marqués dans le document de valeur ou de sécurité par l'intermédiaire d'une modification de couleur.
  11. Procédé selon l'une quelconque des revendications 7 à 10, caractérisé en ce que le marquage (71) est déclenché dans le document de valeur ou de sécurité (2) par l'intermédiaire d'un effet optique non linéaire.
  12. Procédé selon l'une quelconque des revendications 7 à 11, caractérisé en ce qu'au moins deux marquages (71) réalisés séparément l'un de l'autre sont marqués dans le document de valeur ou de sécurité (2) de manière perpendiculaire à la surface (7) du document de valeur ou de sécurité (2) l'un sur l'autre, par la même surface (7).
  13. Procédé selon l'une quelconque des revendications 7 à 12, caractérisé en ce que des marquages (71) sont pratiqués sous la forme de structures diffractives et/ou dispersives à l'intérieur du document de valeur ou de sécurité (2).
  14. Procédé selon la revendication 13, caractérisé en ce que la lumière laser (6) permet d'entraîner une modification locale de l'indice de diffraction d'un matériau du document de valeur ou de sécurité (2) afin de pratiquer la structure diffractive et/ou dispersive.
  15. Procédé selon l'une quelconque des revendications 7 à 14, caractérisé en ce que la lumière laser (6) est générée avec un profil de rayonnement de forme gaussienne et qu'une lentille focalisante entraîne la focalisation au moyen de l'effet Kerr, sachant que la distance focale du matériau de la lentille focalisante se modifie sur la base de l'interaction non linéaire du rayonnement électromagnétique avec le matériau de la lentille, de manière inversement proportionnelle à l'intensité du rayonnement électromagnétique.
EP11707385.8A 2010-02-26 2011-02-25 Dispositif de marquage et procédé de marquage haute résolution de documents de valeur ou de sécurité Active EP2539155B9 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010010070A DE102010010070A1 (de) 2010-02-26 2010-02-26 Markierungsvorrichtung und Verfahren zum Markieren von Wert- oder Sicherheitsdokumenten mit hoher Auflösung
PCT/EP2011/052800 WO2011104330A1 (fr) 2010-02-26 2011-02-25 Dispositif de marquage et procédé de marquage haute résolution de documents de valeur ou de sécurité

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EP2539155A1 EP2539155A1 (fr) 2013-01-02
EP2539155B1 true EP2539155B1 (fr) 2014-10-29
EP2539155B9 EP2539155B9 (fr) 2015-01-21

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EP (1) EP2539155B9 (fr)
CN (1) CN102858552B (fr)
DE (1) DE102010010070A1 (fr)
WO (1) WO2011104330A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102013207379A1 (de) * 2013-04-23 2014-10-23 Bundesdruckerei Gmbh Verfahren und Vorrichtung zur Lasermarkierung mit Graustufenkalibrierung

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DE3048733C2 (de) 1980-12-23 1983-06-16 GAO Gesellschaft für Automation und Organisation mbH, 8000 München "Ausweiskarte und Verfahren zur Herstellung derselben"
CN1113856A (zh) * 1994-05-12 1995-12-27 厄斯特赖希国家银行 加有光学安全标记的证券、用于制造这种证券的连接层以及识别证券真伪的检验装置
NL1000331C2 (nl) 1995-05-10 1996-11-12 Dsm Nv Werkwijze voor de vervaardiging van een gekleurde markering.
US6275250B1 (en) * 1998-05-26 2001-08-14 Sdl, Inc. Fiber gain medium marking system pumped or seeded by a modulated laser diode source and method of energy control
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WO2001028778A2 (fr) 1999-10-19 2001-04-26 Orga Kartensysteme Gmbh Procede pour appliquer des marques de couleur sur un support de donnees, de preference en matiere plastique, et support de donnees produit selon ledit procede
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Also Published As

Publication number Publication date
EP2539155B9 (fr) 2015-01-21
CN102858552B (zh) 2016-01-20
WO2011104330A1 (fr) 2011-09-01
CN102858552A (zh) 2013-01-02
DE102010010070A1 (de) 2011-09-01
EP2539155A1 (fr) 2013-01-02

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