EP2043877A2 - Procédé de production d'un marquage laser dans un document de sécurité et document de sécurité associé - Google Patents

Procédé de production d'un marquage laser dans un document de sécurité et document de sécurité associé

Info

Publication number
EP2043877A2
EP2043877A2 EP07786287A EP07786287A EP2043877A2 EP 2043877 A2 EP2043877 A2 EP 2043877A2 EP 07786287 A EP07786287 A EP 07786287A EP 07786287 A EP07786287 A EP 07786287A EP 2043877 A2 EP2043877 A2 EP 2043877A2
Authority
EP
European Patent Office
Prior art keywords
laser
layer
reflective layer
markable
transparent
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
EP07786287A
Other languages
German (de)
English (en)
Other versions
EP2043877B1 (fr
Inventor
René Staub
Wayne Robert Tompkin
Daniel Holliger
Olaf Krolzig
Andreas Schilling
Achim Hansen
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.)
OVD Kinegram AG
Original Assignee
OVD Kinegram AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38859358&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2043877(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by OVD Kinegram AG filed Critical OVD Kinegram AG
Priority to PL07786287T priority Critical patent/PL2043877T3/pl
Publication of EP2043877A2 publication Critical patent/EP2043877A2/fr
Application granted granted Critical
Publication of EP2043877B1 publication Critical patent/EP2043877B1/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
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • 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
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used

Definitions

  • the invention relates to a method for producing a laser marking in a security document by means of at least one laser beam, wherein the security document has at least one laser-markable layer and at least one reflective layer having at least one laser-markable layer at least partially overlapping and opaque regions.
  • An identification card or a similar data carrier is formed in this order with a laser-markable layer, a reflective metal layer and a transparent card cover layer.
  • congruent markings are introduced through the card deck layer into the reflective metal layer and the laser-markable layer.
  • the laser-markable layer can be applied as a lacquer layer on a card core layer, wherein the reflective metal layer does not completely cover the laser-markable layer and thus markings can additionally be introduced into the laser-markable layer next to the reflective metal layer.
  • WO 01/62509 A1 discloses a method for the production of a data carrier which has a laser-markable layer and a light-transmissive, optically variable layer which overlaps the latter at least in regions.
  • Optically variable layers show different visual impressions at different viewing angles, such as different colors.
  • the translucent optically variable layer is arranged on the side facing the viewer of the laser-markable layer and is used for the Laser radiation largely transparent.
  • visually perceptible markings in particular black markings, are inscribed into the laser-markable layer through the optically variable layer, the optically variable effect being clearly visible, in particular in the regions of the optically variable layer which lie above the generated laser mark.
  • the optically variable effect is less visible.
  • security elements with opaque, reflective regions are visually easily recognizable, irrespective of the background, owing to the high reflectivity of the opaque metal regions.
  • the reflective metal layer is hereby congruently cut through during the laser marking of a laser-markable layer arranged thereunder, so that only material changed by the laser irradiation of the laser-markable layer is visible in the openings which were produced in the reflective metal layer. An information content of the laser marking in the laser-markable layer independent of the formation of the openings in the reflective metal layer can not be generated.
  • the object is for the method for producing a laser mark in a security document by means of at least one laser beam, wherein the
  • Security document at least one laser-markable layer and at least one, at least one laser-markable layer at least partially overlapping and opaque regions having reflective layer, achieved in that the at least one reflective layer at least in an overlap region in which the at least one reflective layer and the laser-markable Layer overlap, seen perpendicular to the plane of the reflective layer with at least one, on at least two sides of an opaque region of the at least one reflective layer surrounded transparent region is formed, that the at least one reflective Layer between at least one laser radiation source for the at least one laser beam and the at least one laser-markable layer is arranged and that the laser marking is visually generated through the at least one transparent region recognizable in the at least one laser-markable layer, wherein the at least one reflective layer at least visually largely unchanged preserved.
  • the method according to the invention makes it possible to introduce a laser marking into a laser-markable layer without changing, or only partially, a reflecting layer with opaque or semitransparent areas and transparent areas located in the laser beam path during laser marking over the laser-markable layer in the laser beam path to change.
  • the reflective layer may possibly be slightly modified, but this should not be visible to the viewer visually, ie without further aids such as magnifying glasses, microscopes or the like.
  • a slight change in the visual impression, for example in the reflection behavior, may even be desirable as an additional special safety effect.
  • the opaque areas of the at least one reflective layer produce impressive visual effects that are perfectly recognizable regardless of the background.
  • the laser marking of the underlying laser-markable layer is visible, which was introduced through the transparent regions.
  • the laser marking for the viewer preferably extends optically over a plurality of semitransparent or transparent regions which are separated from one another by opaque regions.
  • the object is for a security document obtainable in particular by the method according to the invention which has at least one laser-markable layer and at least one reflective layer having at least one laser-markable layer at least partially overlapping and opaque regions, wherein the at least one reflective layer is at least in an overlap region in which the at least one reflective layer and the laser-markable layer overlap, viewed perpendicular to the plane of the reflective layer, at least one transparent region surrounded on at least two sides by an opaque region of the at least one reflective layer, achieved visually in at least two adjacent transparent regions by an observer the laser marking is formed independently of the configuration of the transparent regions in the reflective layer, and that the laser marking in the laser-markable layer underneath the opaque regions is visually unobstructed by the viewer is.
  • alphanumeric characters or character strings, symbols, logos, images, photos, signatures, lines, biometric data such as fingerprints or the like are permanently inscribed into the laser-markable layer as identifiers or markings with the at least one laser beam.
  • identity documents passports, identity cards, bank cards, tickets, documents of value such as banknotes, etc.
  • security documents are understood as security documents.
  • the laser beam is used for individualization or personalization of a security or value document by person-specific data such as name, date of birth address, signature, photograph, etc., or other data such as serial numbers, barcodes, etc. are generated on the document.
  • person-specific data such as name, date of birth address, signature, photograph, etc., or other data such as serial numbers, barcodes, etc.
  • black and white markings, grayscale images, color images or color markings can be formed.
  • a metal layer is preferably used, but also colored semiconductor layers, such as layers of silicon, germanium or lead sulfide are suitable. It has proven useful if the opaque regions of the at least one reflective layer are formed perpendicular to the plane of the reflective layer in the form of a pattern and / or a grid and / or a field of parallel and / or curved lines. Furthermore, the opaque regions can form a dot matrix, the same or different
  • Grid spacing and / or same or different grid dot sizes may have.
  • the at least one transparent area is surrounded on all sides by opaque areas.
  • An at least substantial visual impairment of the at least one reflective layer in the opaque regions is effectively avoided in the laser marking on the one hand by forming the at least one reflective layer in the opaque regions with a thickness in the range of 0.2 to 150 .mu.m and the at least one laser beam for generating the laser marking is guided over the opaque regions of the at least one reflective layer and the at least one transparent region.
  • the at least one reflective layer in the opaque regions Due to the relatively high thickness of the at least one reflective layer in the opaque regions compared to conventionally used on security elements reflective layer material is only partially or not at all evaporated or damaged in the laser irradiation when the at least one laser beam, the opaque areas crossed. If the heat dissipation of the thick reflective layer is sufficiently high, then the reflective layer will not be evaporated in the opaque regions. In any event, after crossing an opaque area, a sufficiently thick reflective layer will remain in the opaque areas to be visually equivalent or nearly equivalent to opaque areas not crossed by the laser beam.
  • the material for forming the at least one reflective layer absorbs the laser radiation as low as possible.
  • the at least one reflective layer is formed as a metal layer, in particular Silver, gold, aluminum, nickel, chromium, copper, etc., formed.
  • the reflective layer can also be a multi-layer structure comprising at least two layers of different materials arranged congruently one above the other.
  • a thin, optically attractive reflective layer which is visible to the viewer, can be combined with a thick, optically less attractive reflective layer which is not intended to be visible and, above all, serves for heat dissipation.
  • a diffractive relief structure can be arranged in opaque regions of the reflective layer, which in particular causes a reduction in the absorption of the laser beam.
  • a visual impairment of the at least one reflective layer in the opaque areas is further effectively avoided in laser marking by performing position detection of at least parts of the opaque areas of the at least one reflective layer such that the at least one laser beam generates the laser mark based on the position detection detected data is controlled, such that the at least one laser beam to generate the laser marking at no point incident on the opaque areas of the at least one reflective layer.
  • the opaque areas are completely recessed and not acted upon by the laser radiation.
  • the power of the laser beam is lowered in the opaque regions of the reflective layer.
  • the position detection is carried out optically.
  • the position of the opaque areas is at least partially optically detected by means of a sensor unit and the determined data are transmitted to a computing unit.
  • the arithmetic unit controls the laser based on the data.
  • a direct optical detection of the position of all opaque regions can take place, but in particular of the opaque regions lying in the laser path of the laser beam for forming the laser marking.
  • the captured image of all the opaque areas of the at least one reflective layer provides the necessary data to appropriately control the laser and eliminate opaque areas from the laser treatment or to provide a reduced power laser beam. This is particularly advantageous when the opaque areas vary, for example due to manufacturing tolerances, the formation of individual or personal data or a Kinegram ® s.
  • the laser path to be completed for example in the form of a signature train or a serial number, must already be stored as a data record in the arithmetic unit.
  • an optical scanning of the laser-markable layer takes place at all points which the laser beam is intended to cover in order to generate the at least one laser mark.
  • data is generated and used to control the laser beam, so that in the area of the opaque areas no or a reduced-power laser treatment takes place.
  • the at least one reflective layer is formed with at least one optically detectable position marker and a position of the position marker is determined or independent of the reflective layer on the security document at least one optically detectable position marker is formed and a position of the position marker is determined .
  • Suitable position markers are diffractive markings, printed markings, markings produced by a laser, machine-readable markings, such as marks detectable by infrared radiation, magnetic markings, etc.
  • the reflective layer itself can be used to form position markings with opaque areas in the form of arrows, bars , Points, etc. are formed.
  • the at least one reflective layer or the security document is preferably formed with at least three optically detectable position markings and determines the position of the at least three position markings in order to possibly distort the at least one reflective layer when the at least one reflective layer is applied to the at least one laser-markable layer capture and compensate for them.
  • a visual impairment of the at least one reflective layer in the opaque regions is effectively avoided in the laser marking by at least one detection laser beam is coupled into the at least one laser beam to produce the laser marking or parallel to the at least one laser beam, and that a lowering the power of the at least one laser beam for generating the laser marking or the switching-off thereof takes place when the at least one detection laser beam detects the presence of opaque regions of the at least one reflective layer.
  • the radiation is deflected differently depending on the wavelength, so that a "spatial" correction must be made between the position of the opaque regions detected by the detection laser beam and the position to be actually emanated from the irradiation by the laser beam for generating the laser marking the detection laser beam but also be angled with respect to the laser beam for generating the laser marking, wherein both the detection laser beam and the laser beam to produce the laser marking are directed to a common point of the reflective layer.
  • the power of the laser is set at a value below a power limit from which ablation occurs and the direct or diffuse reflection of the degraded laser beam at that position is measured. If a transparent area is detected with little or no reflection, the power of the laser is increased and at the selected position the laser marking is generated in the laser-markable layer. Otherwise, the laser will continue to move without a change in power and the measurement will be repeated at the next location.
  • Another possibility for protecting opaque areas of the reflective layer is to use a mask, which is arranged in the beam path between the laser and the reflective layer.
  • the mask is designed in such a way that it overlaps the opaque areas of the reflective layer for the laser beam with impenetrable areas which cover the underlying opaque areas of the reflective layer in front of the laser beam protect.
  • a lens arrangement or a lens array can be used as a mask over the reflective layer, wherein the laser beam is focused by the lenses on certain points of the reflective layer and affects the path of the laser beam on the reflective layer.
  • Optical scanning of the opaque regions of the reflective layer serves to position the impenetrable or laser beam-deflecting regions of the mask over the opaque regions of the reflective layer as accurately as possible.
  • both low and high-absorbency materials can be used to form the at least one reflective layer. It has proven useful to form the at least one reflective layer as a metal layer, in particular of silver, gold, aluminum, nickel, copper, chromium, etc.
  • the opaque regions of the at least one reflective layer are formed as filigree lines with a width in the range from 0.5 to 1000 ⁇ m. Such thin, opaque lines are particularly difficult to imitate and are particularly easily damaged by a laser irradiation, so that a high protection against counterfeiting or change for the security document is achieved.
  • the filigree opaque lines are arranged adjacent to the at least one transparent region.
  • a laser marking is preferably visible, in particular in addition to unmarked, thus color-different areas of the laser-markable layer.
  • the at least one reflective layer is arranged on or in a transparent film body and the film body including the at least one reflective layer is arranged overlapping the at least one laser-markable layer.
  • the formation of the at least one reflective layer can not be directly on the laser-markable Layer can take place and may further include process steps that could affect the laser-markable layer.
  • the film body can be applied as a transfer layer of a transfer film or as a laminating film overlapping the at least one laser-markable layer.
  • a transfer layer may also be applied to a transparent, transparent transparent protective layer which is permeable to laser radiation, and laminated therewith to the at least one laser-markable layer.
  • This has the advantage that the at least one reflective layer below the protective layer can be arranged protected against mechanical and / or chemical attack.
  • the transfer layer of the transfer film can be embossed onto a banknote by means of hot stamping.
  • the film body is glued or laminated onto the at least one laser-markable layer.
  • the film body may contain other security elements, such as luminescent substances, photochromic substances, interference or liquid crystal pigments, etc.
  • the at least one reflective layer is preferably formed at a lower thickness at these locations than in the opaque regions or the at least one reflective layer is provided with an opening.
  • either the at least one reflective layer can be present with such a small thickness that it is transparent and is not visible or barely visible to a viewer.
  • Particularly suitable here are methods for producing such a reflective layer, in which first areas with a diffractive Re structure are embossed into a transparent layer and then the flat second areas and provided with the relief structure first areas of the transparent layer with a constant area density based the plane of the transparent layer is sputtered with material for forming the reflective layer.
  • the material for forming the reflective layer is sputtered in a thickness such that due to the relief structure in the first regions an at least substantially transparent reflective layer on the surface of the transparent layer forms, while forming in the planar second areas an opaque reflective layer.
  • the at least one reflective layer may be completely interrupted so that there is no material of the reflective layer. This is usually achieved by partially forming the reflective layer via masks or partially removing the reflective layer, for example by etching the reflective layer.
  • opaque regions of the reflective layer are formed with at least two different layer thicknesses.
  • the result during laser treatment can additionally be varied.
  • Laser marking is only partially filled, so that unmarked areas of the laser-markable layer remain visible within the at least one transparent area.
  • the at least one laser beam for generating the laser marking impinges perpendicular to the plane of the security document.
  • the at least one laser beam for generating the laser marking is aligned at the edge of the at least one transparent area obliquely to the plane of the security document and the laser marking is continued below the opaque areas, at least over a short area.
  • a color change, a blackening or a bleaching in the region of the laser marking preferably takes place in the at least one laser-markable layer. This will produce color markers, color images, black-and-white marks, grayscale images, or combinations thereof.
  • laser marking is produced in particular permanently or irreversibly in the laser-markable layer and can not be erased again by subsequent UV irradiation or else.
  • the different colorants may also be admixed to a single laser-markable layer, which is present in the mixed color of all laser-sensitive colorants before the laser treatment.
  • yellow pigments are preferably bleached by means of blue laser light, cyan pigments, preferably with red laser light and magenta pigments, preferably with green laser light.
  • Black laser-markable layers preferably contain carbon, while blackenable laser-markable layers in particular contain decomposable carbon compounds by means of laser radiation.
  • laser-markable materials which show a significant, irreversible color change, for example in the case of laser irradiation, may be contained in the laser-markable layer.
  • a plurality of laser-markable layers one above the other or a laser-markable layer containing a mixture of different colorants can be by means of successive laser irradiation of individual laser-markable layers or individual points of the laser-markable layer containing a mixture of different colorants by subtractive or additive color mixing full color images with natural color, for example a photograph of the owner of the security document to be marked.
  • the at least one laser-markable layer may be disposed on a supporting substrate of paper, PE, PC, PET, PVC or Teslin ®.
  • the at least one laser-markable layer like the reflective layer, can be laminated onto the carrier substrate as a laminating film or transfer layer of a transfer film or adhesively bonded with the aid of an adhesive layer.
  • the security document may comprise additional layers, such as protective layers, printed layers, etc., which are arranged on the back side of the carrier substrate, between the carrier substrate and the laser-markable layer, between the laser-markable layer and the reflective layer and on the reflective layer.
  • a background layer is arranged between the at least one laser-markable layer and the carrier substrate, which absorbs the at least one laser beam for generating the laser marking. This is particularly advantageous for sensitive paper substrates.
  • the at least one laser-markable layer is preferably arranged in patterned fashion on the carrier substrate. This can be achieved by direct application of the coating material by means of e.g. Printing or by a transfer process in which the laser-markable layer is supported on a support, e.g. a transfer film is formed and transferred in a solid state to the carrier substrate while the carrier is withdrawn again. This allows a visually appealing design of the security document.
  • the at least one laser-markable layer itself may be provided by a laser-markable supporting substrate of paper, PVC, PC, Teslin ® or doped with laser-markable substances carrier substrate.
  • At least two reflective layers with opaque regions of different colors are arranged on the at least one laser-markable layer.
  • the combination of silver and gold-colored opaque metal areas creates a particularly high-quality appearance.
  • the transparent film body or the security document in addition to the at least one reflective layer, a transparent or semi-transparent ink layer and / or a transparent or semi-transparent dielectric layer and / or a transparent or semi-transparent transparent optically variable layer.
  • this can also be laser-markable, wherein a laser marking can be carried out with the same laser beam, which is also used to mark the laser-markable layer.
  • a simultaneous laser marking with the laser-markable layer is preferred.
  • the transparent color layer and / or the transparent HRI layer and / or the transparent optically variable layer is preferably arranged on the side of the reflective layer opposite the laser-markable layer.
  • An optically variable layer preferably comprises a diffractive structure and / or a holographic structure, in particular a hologram or Kinegram ®, and / or a liquid crystal material and / or a thin-film multilayer system with blickwinkeltwoem interference effect, which can also include transparent metal thin films, and / or a photochromic substance and / or a luminescent substance.
  • the permeability of the transparent regions of the reflective layer for the at least one laser beam is preferably not adversely affected by the additional transparent or semi-transparent layers contained in the transparent film body or security document.
  • the optically variable layer extends over opaque areas and / or over the at least one transparent area.
  • the optically variable effect of the optically variable layer can only show above and in the register to opaque areas or else only above and in register with the at least one transparent area.
  • the optically variable effect of the optically variable layer is in the region of the diffractive or holographic structure either by the reflective layer itself or, if this has an opening, for example by an additional transparent dielectric Reinforced HRI layer (High Refraction Index).
  • an at least substantially transparent dielectric HRI layer can be provided below and / or above the reflective layer which hardly or hardly disturbs a laser marking of the laser-markable layer and which is not or is not substantially impaired by the laser radiation.
  • Such an HRI layer can be arranged in register with the opaque areas and / or the transparent areas of the reflective layer and thereby provide additional, attractive optical effects.
  • Known materials for HRI layers are, for example, ZnS or TiO 2 .
  • the transparent color layer and / or the transparent HRI layer and / or the transparent optically variable layer can be arranged on the side of the reflective layer opposite the laser-markable layer.
  • the color layer, the HRI layer or the optically variable layer can be applied directly to the reflective layer or applied to a transparent film which optionally exhibits at least regionally or pattern-like diffractive relief structures, wherein the film is then arranged above or below the reflective layer For example, by gluing, laminating, hot stamping, etc ..
  • a microlens array may be present in combination with the reflective layer, wherein the laser beam is focused by means of a microlens and additionally influences the result of the laser irradiation and the result visible thereafter.
  • the at least one laser beam for generating the laser marking is generated by a NeodymYAG laser radiation source.
  • other laser radiation sources can be used.
  • Pulsed, frequency-multiplied solid-state lasers, optical parametric oscillators (OPO 's ) and pulsed UV lasers (such as excimer lasers) are suitable.
  • energy densities are preferably between 0.05 and 0.5 J / cm 2 at a Pulse duration of 5 to 20 ns applied. The result is still determined by the number of pulses.
  • the invention does not exclude that in combination also opaque areas of the reflective layer or regions of an HRI layer or optically variable layer are at least partially changed with the laser beam very specific, for example, to make an additional personalization.
  • opaque regions of the reflective layer which according to the invention were not or hardly changed by the laser irradiation of the laser-markable layer underneath, visibly altered opaque regions may also be present by means of the laser beam, for example by blackening, haze or ablation, as is apparent DE 44 10 431 A1 is already sufficiently known.
  • FIGS. 1 to 3 are intended to illustrate the invention by way of example. So shows:
  • FIG. 1 shows a security document in the form of an identity card
  • FIG. 2 a shows a simplified sectional representation in the area A - A ' through a security document according to FIG. 1,
  • FIG. 2b shows a real sectional representation in the area A - A ' through a security document according to FIG. 1
  • FIG. 2c shows a further simplified sectional representation in the area A-A ' through a security document according to FIG. 1, containing an optically variable layer with a diffractive structure,
  • FIG. 3 shows a transparent film body with a reflective metal layer comprising filigree metal lines as opaque areas
  • FIGS. 4a to 4c the personalization of a badge by means of laser.
  • FIG. 1 shows a security document 1 in the form of an identity card in plan view.
  • the security document 1 comprises a region-wise printed, laser-markable layer 2 in the form of a signature field and a circular film body 5.
  • the film body 5 comprises as a reflective layer a metal layer whose opaque areas 3 are formed in a line shape with a width of 50 ⁇ m each and show two concentric circles containing three concentric stars. Between the opaque metal lines 3 are laser-transmissive, transparent areas 3a, in which the metal layer has openings which reveal the view of underlying areas of the laser-markable layer 2, a photo 6 of the cardholder and a carrier substrate 7 (see FIGS. 2a to 2c). A laser marking 4 in the form of a signature of the cardholder was introduced into the laser-markable layer 2 with laser radiation. The laser marking 4 acts for the viewer as if it had already been present in the laser-markable layer 2 before the application of the film element 5.
  • Figure 2a shows a simplified sectional view in the area A - A ' by the security element 1 according to Figure 1.
  • the cutting line follows exactly the course of the laser marking 4 and thus the opaque metal lines 3 of the concentric circles and Stars as well as the transparent areas 3a exactly in the area of the laser marking 4 intersects.
  • the laser-markable layer 2 can be seen, which covers the film body 5 containing the metal layer.
  • the film body 5 comprises the filigree, line-shaped, opaque metal regions 3.
  • the top side of the security element 1 shown here is overlaminated with a transparent, laser-beam-transparent protective film 8, so that the film element 5 is embedded in a protective manner between the protective film 8 and the carrier substrate 7.
  • the laser beam for generating the laser marking 4 was directed perpendicular to the plane of the security element 1 and the laser marking 4 was generated in the laser-markable layer 2.
  • Titanium dioxide (d 3.8-4.2 g / cm 3 ) 26.0 parts
  • the opaque metal regions 3 of the metal layer are formed of silver and formed in a thickness of 10 ⁇ m.
  • the laser beam is controlled on the basis of the generated data such that the opaque metal regions 3 are either recessed from the laser treatment be applied or less laser power is applied to the laser beam or faster over the opaque metal regions 3 than over the areas to be marked of the laser-markable layer 2.
  • the opaque metal regions 3 of the metal layer are formed in a thickness of 30 nm and used as material for the Metal layer gold used.
  • the laser-markable layer 2 is in any case in unchanged form, since the laser beam for generating the laser marking 4 (see FIG. 1) does not become active below the opaque metal regions 3.
  • the at least one laser beam reaches the laser-markable layer 2, which is thus changed in color in the regions 2a and the viewer seen perpendicular to the metal layer level, a laser marking 4, which is designed as a signature train shows.
  • the viewer shows the laser marking 4 (or the laser-marked areas 2a) in Figure 1 as a continuous signature in the otherwise color unchanged laser markable layer 2 and regardless of the shape of the opaque metal regions 3 of the metal layer.
  • the signature string is broken in the area below each of the opaque metal lines.
  • the background area, which deposited the signature be formed as a laser mark and the signature in the color of the non-laser-marked and color therefore not changed laser-markable layer.
  • an interruption of the laser marking would be present perpendicular to the plane of the metal layer below the opaque metal areas in the background area - visually imperceptible to a viewer - while the signature train would also be present underneath the opaque metal areas.
  • FIG. 2 b shows the real sectional representation in the region A - A ' through the security element 1 according to FIG. 1.
  • FIG. 2 c shows a further simplified sectional representation in the area A - A ' through a security element 1 according to FIG. 1, which, however, here comprises an optically variable layer 9 with a diffractive relief structure 9 ' .
  • the cutting line exactly follows the course of the laser marking 4 and thus the opaque metal lines 3 of the concentric circles and stars and the transparent regions 3 a cut exactly in the region of the laser marking 4.
  • the laser-markable layer 2 can be seen, which covers the film body 5 containing the metal layer.
  • the film body 5 comprises the filigree, line-shaped, opaque metal regions 3.
  • the top side of the security element 1 shown here is overlaminated with a transparent, laser-beam-transparent protective film 8, so that the film element 5 is embedded in a protective manner between the protective film 8 and the carrier substrate 7.
  • the diffractive relief structure 9 ' is arranged in the register to the transparent regions in the metal layer, wherein on the side of the optically variable layer 9, which is the diffractive
  • Relief structure 9 ' a not shown here separately transparent HRI layer of ZnS is arranged.
  • 3 shows an approximately 400% increase of an example of a sheet member 5 'comprising filigree grid linearly arranged opaque metal regions 3 and more opaque metal areas (such as in the form of a cross), the foil member 5' is a Kinegram ® and one or several laser-sensitive layers can be arranged.
  • FIG. 4a shows a plan view of a blank ID card 10 ' prior to the laser personalization, that is to say before the entry of personal, individual data of a card holder.
  • Blank badge 10 ' provides space for a photo of the cardholder as well as for his name, first name,
  • a film element 50 is now transferred to the blank ID card 10 ' by means of a hot stamping foil, wherein the laser-markable regions in which the personal data are to be written in are partially covered.
  • the film element 50 has, as a reflective layer, a metal layer whose opaque regions 30 are formed in a line with a width of 55 ⁇ m in each case. All opaque areas 30 together result in a flower-like structure composed of newly individual ellipses.
  • the opaque regions 30 are located in a region of the film element 50 having a relief structure which exhibits a kinematic effect. Visible is a so-called Kinegram ® .
  • the identification card 10 " coated by means of the film element 50 does not yet contain personal data, but merely the film element 50.
  • the personal data of a cardholder are now introduced into the coated card 10 " by means of a laser beam, whereby a card holder 60 image is generated by means of a laser beam overlapping the film member 50. Further, data 40a, 40b are inscribed, wherein the data 40b also with the film element 50th overlap.
  • the laser personalization in the region of the film element 50 or the opaque regions 30 takes place according to the method according to the invention by the opaque regions 30 of the metal layer are recessed by the laser irradiation or protected in the laser treatment.
  • the impression for the finished identification card 10 '" arises as if the laser marking in the form of the data 40b or of the image 60 had already been produced in the blank identification card 10 ' before the application of the film element 50.
  • the opaque regions 30 of the metal layer Adjacent areas with the laser marking do not differ at least optically from opaque areas 30 to which no laser marking adjoins, so attaching the foil element 50 only after the introduction of the laser marking can thus be dispensed with.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Credit Cards Or The Like (AREA)
  • Laser Beam Processing (AREA)

Abstract

L'invention concerne un procédé de production d'un marquage laser dans un document de sécurité au moyen d'au moins un rayon laser. Le document de sécurité comporte au moins une couche pouvant être marquée au laser ainsi qu'au moins une couche réfléchissante superposée au moins partiellement avec la ou les couches pouvant être marquées au laser et comportant des zones opaques. La ou les couches réfléchissantes comportent au moins une zone transparente et ne sont pas sensiblement modifiées au moins visuellement par le traitement au laser de la couche pouvant être marquée au laser.
EP07786287.8A 2006-07-25 2007-07-24 Procédé de production d'un marquage laser dans un document de sécurité et document de sécurité associé Active EP2043877B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07786287T PL2043877T3 (pl) 2006-07-25 2007-07-24 Sposób wytwarzania oznakowania laserowego w dokumencie bezpiecznym oraz tego rodzaju dokument bezpieczny

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006034854A DE102006034854A1 (de) 2006-07-25 2006-07-25 Verfahren zur Erzeugen einer Lasermarkierung in einem Sicherheitsdokument sowie derartiges Sicherheitsdokument
PCT/EP2007/006560 WO2008012061A2 (fr) 2006-07-25 2007-07-24 Procédé de production d'un marquage laser dans un document de sécurité et document de sécurité associé

Publications (2)

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EP2043877A2 true EP2043877A2 (fr) 2009-04-08
EP2043877B1 EP2043877B1 (fr) 2015-03-04

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EP07786287.8A Active EP2043877B1 (fr) 2006-07-25 2007-07-24 Procédé de production d'un marquage laser dans un document de sécurité et document de sécurité associé

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Country Link
US (1) US8298753B2 (fr)
EP (1) EP2043877B1 (fr)
JP (1) JP4861476B2 (fr)
CA (1) CA2657796C (fr)
DE (1) DE102006034854A1 (fr)
ES (1) ES2538457T3 (fr)
HU (1) HUE026435T2 (fr)
MX (1) MX2009000789A (fr)
PL (1) PL2043877T3 (fr)
PT (1) PT2043877E (fr)
UA (1) UA97808C2 (fr)
WO (1) WO2008012061A2 (fr)

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Also Published As

Publication number Publication date
HUE026435T2 (en) 2016-06-28
WO2008012061A3 (fr) 2008-05-08
EP2043877B1 (fr) 2015-03-04
MX2009000789A (es) 2009-02-03
WO2008012061A2 (fr) 2008-01-31
PL2043877T3 (pl) 2015-08-31
US20090315316A1 (en) 2009-12-24
UA97808C2 (uk) 2012-03-26
PT2043877E (pt) 2015-07-06
CA2657796A1 (fr) 2008-01-31
DE102006034854A1 (de) 2008-01-31
US8298753B2 (en) 2012-10-30
CA2657796C (fr) 2015-02-10
ES2538457T3 (es) 2015-06-22
JP2010534145A (ja) 2010-11-04
JP4861476B2 (ja) 2012-01-25

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