EP1697146B1 - Data support with identifications written thereon by means of a laser beam and method for production thereof - Google Patents

Data support with identifications written thereon by means of a laser beam and method for production thereof Download PDF

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Publication number
EP1697146B1
EP1697146B1 EP04803402A EP04803402A EP1697146B1 EP 1697146 B1 EP1697146 B1 EP 1697146B1 EP 04803402 A EP04803402 A EP 04803402A EP 04803402 A EP04803402 A EP 04803402A EP 1697146 B1 EP1697146 B1 EP 1697146B1
Authority
EP
European Patent Office
Prior art keywords
data carrier
characterized
recording layer
identifiers
carrier according
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
EP04803402A
Other languages
German (de)
French (fr)
Other versions
EP1697146A2 (en
Inventor
Matthias Bergmann
Günter Endres
Georg Kruse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Mobile Security GmbH
Original Assignee
Giesecke and Devrient GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
Priority to DE10358784A priority Critical patent/DE10358784A1/en
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Priority to PCT/EP2004/013634 priority patent/WO2005058610A2/en
Publication of EP1697146A2 publication Critical patent/EP1697146A2/en
Application granted granted Critical
Publication of EP1697146B1 publication Critical patent/EP1697146B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34672782&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1697146(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40Manufacture
    • B42D25/405Marking
    • B42D25/43Marking by removal of material
    • B42D25/435Marking by removal of material using electromagnetic radiation, e.g. laser
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23Identity cards
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29Securities; Bank notes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D2033/00Structure or construction of identity, credit, cheque or like information-bearing cards
    • B42D2033/24Reliefs or indentations

Abstract

The invention relates to a data support on which identifications (20, 22), in the form of patterns, letters, numbers and/or images have been applied by means of laser beams, which are visible due to local changes in the optical properties of the data support brought about by material changes generated by the laser beam. According to the invention, the data support comprises a laser-sensitive recording layer (26), transparent in the visible spectral range, provided with a surface relief in the form of a lenticulation (28). The identifications are written in the recording layer (26) with a laser beam through the lenticulation (28) from various angles and are visible on later viewing at the same angle. The data support is transparent at least in the region of the applied identifications (20, 22).

Description

  • The invention relates to a data carrier, in which by a laser beam markings in the form of patterns, letters, numbers and / or images are introduced, which are visible due to caused by the laser beam, resulting from material changes local changes in the optical properties of the disk.
  • Data carriers such as identification cards, credit cards, bank cards and the like are increasingly used in various service sectors, but also in the in-house area. They usually have to meet two opposing conditions. Because of their widespread use, they are a mass-produced product that should be simple and inexpensive to produce. On the other hand, they should offer the greatest possible security against counterfeiting or falsification due to their legitimacy function. The variety of types of ID cards available is testimony to the numerous efforts and various suggestions as to how these conflicting requirements can be properly linked.
  • For example, from the German patent specification DE 31 51 407 C1 a multi-layered ID card is known, which is equipped with a plastic sheet as a recording medium. The plastic film appears completely transparent in the visible wavelength range, but absorbs so strongly at the wavelength of an infrared laser used for writing information that localized blackening of the film results due to the action of the laser beam. This allows images and / or data to be written in the plastic film with a good resolution.
  • Even if the ID card of the DE 3151407 C1 provides a high level of anti-counterfeiting security, there is a need to expand the visual design possibilities of such cards and to further complicate the falsification or forgery of the cards by introducing new or additional security features.
  • In this context, it has long been known to provide identity cards with holographic or hologram-like diffraction structures. Such structures provide the cards with optically variable effects while providing effective protection against photographic or xerographic reproduction. Due to the high production costs of holographic structures, these can only be produced with the use of large numbers at economically justifiable expense. As a rule, this requires that the information content of the holograms does not differ from one another. To produce the information is usually embossed with a die in a plastic sheet. The plastic film is provided with a reflective layer and the surface is sealed with a protective layer. The finished hologram is glued to the card surface during card production. For the reasons mentioned above, the holograms are usually not provided with information adapted to the respective card, so that it is basically possible to transfer a hologram from a real card to a wrong card.
  • Another difficulty is that the visual inspection of a hologram requires good light conditions. Even in the diffuse room lighting prevalent in banks, shops or businesses, the holographic effects are often difficult or impossible to recognize. Even with so-called decorative materials can be reflective or metallic easily iridescent surfaces are generated, so that the structures formed by such decorative materials can be confused by laymen under unfavorable lighting conditions with real holograms.
  • Proceeding from this, the object of the invention is to expand the visual design options of a laser-printed data carrier, and in particular to introduce photographic or xerographic features that are not reproducible, which can be recognized even in unfavorable lighting conditions.
  • This object is achieved by the data carrier and the production method having the features of the independent claims. Further developments of the invention are the subject of the dependent claims.
  • According to the invention, a generic data carrier comprises a transparent in the visible spectral range, laser-sensitive recording layer, which is provided with a surface relief in the form of a lenticular grid. The markings are introduced with the laser beam from different directions through the lens grid in the recording layer and seen from the same directions when viewed. At least in the area of the introduced markings, the data carrier is transparent. This feature combination combines a visually appealing design of the data carrier with high security against counterfeiting.
  • The labels are introduced through the lenticular array into the underlying recording layer. In this case, the laser beam is held at different, predetermined angles to the plane of the lens grid, so that when passing the laser radiation through the lenses different Modified areas of the recording layer are usually blackened. The labels introduced in this way are essentially only recognizable from the angle at which they were introduced. The size of the angular range under which a mark is visible depends on the size of the modified area, and can be adjusted, for example, via the pulse energy of the laser beam. Thus, the data carrier can be provided with two or more different markings, which can not be reproduced photographically or xerographically, since from a certain viewing angle, the entire written information is never recognizable.
  • Since the data carrier is transparent, at least in the area of the introduced markings, the markings visible on account of the local changes in the optical properties of the data carrier are optionally additionally or exclusively detectable in transmitted light, i. regardless of viewing from the front or back or only when viewing from one side. As an alternative to blackening or other discoloration of the recording layer, the laser beam can also cause, for example, a local change in the refractive index or a change in the polarization direction of the transparent recording layer, so that the inscribed marking in reflected light, ie when viewed from the front (lens) side is virtually invisible. Thus, visually appealing authenticity features can be introduced into data carriers which, together with the preferably specific information content, give it a high degree of protection against counterfeiting.
  • In an advantageous embodiment of the invention, the lens grid comprises cylindrical lenses and / or spherical lenses. Depending on the specific application, the axis of the cylindrical lenses can be straight or curved, parallel or at a certain angle to the outer edges of the disk.
  • The recording layer may be part of a transparent main body of the data carrier or may alternatively be formed by a separate layer. In the latter case, the recording layer is formed according to a development of the invention by a non-self-supporting layer of a thickness particularly preferably from about 1 micron to about 50 microns, for example, at least partially doped plastic film of polycarbonate or polyester. To protect the written information and to increase the security against counterfeiting, the recording layer is preferably arranged in the interior of the data carrier. The thickness of the layer depends inter alia on the material, the lens geometry and the type of application and preferably varies between 1 and 800 μm. The layer may consist of PVC, PC, polyester and compounds thereof.
  • The markings may include personal data, such as a signature, a date of birth, a portrait or the like, but also or additionally data carrier-related data, such as a period of validity, a card number, information on the issuing authority or institute or the like. Rasterized markings are particularly suitable for the laser marking, wherein the raster elements are preferably formed by rod-shaped pixels. The individual raster elements can then be generated in a controlled manner by pulsed irradiation of the recording layer, for example with an Nd: YAG laser, a Nd: glass laser or else a longer-wavelength CO 2 laser.
  • The markings which can be recognized from different directions are expediently nested in one another in the recording layer. The Separation of the information content takes place when viewing the data carrier from the viewing directions corresponding to the recording directions, since the lens grid shows the observer only the part of the markings associated with the viewing direction. This makes a technical reproduction of the written information practically impossible, since an exact alignment with a later applied lenticular does not succeed with the required accuracy.
  • In an expedient embodiment, the recording layer and the lenticular grid are arranged in or on a transparent main body of the data carrier. In addition to the previously described laser-written markings, the data carrier may of course have further black-and-white or colored imprints and / or further laser inscriptions. The data carrier can also be provided with one or more further security features, in particular luminescent, magnetic or electrical substances, or optically variable structures, such as holographic structures.
  • In a further embodiment, the transparent recording layer is integrated as an implant or part of a transparent implant in the main body. In this case, it makes sense to physically link the implant to the main body. This is possible for example by a lenticular grid which is larger than the transparent implant and at least partially overlaps the implant and the main body. Furthermore, this is possible if the implant and the main body each have a recording layer which adjoin one another, for example, so that the implant and card body are inseparably connected to one and the same personalization, eg an image.
  • The data carrier preferably represents a value document, such as a banknote, an identity card or the like. In other, likewise advantageous embodiments, the data carrier represents a security element for application to a value document, such as a banknote, an identity card or the like.
  • The invention also includes a value document, such as a banknote, identity card or the like, having a value document substrate with a window area or hole covered on one side or on both sides with a security element of said type. Since the security element according to the invention is transparent, the registered markings can be read through the window area or the hole of the security in transmitted light.
  • In the production of a data carrier of the type described, the laser sensitive recording layer transparent to the visible spectral region is first provided with the surface relief in the form of a lenticular array, and subsequently in a transparent region of the data carrier the markings with the laser beam are transmitted from different directions through the lenticular image into the recording layer brought in, so that the markings in the subsequent viewing of the disk from the same directions are recognizable.
  • The markings are preferably introduced in a raster method, wherein the raster elements are preferably formed by rod-shaped pixels. Pulsed laser radiation is particularly well suited for the production of such raster elements.
  • Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.
  • Show it:
  • Fig.1
    a plan view of a transparent ID card according to an embodiment of the invention in a schematic representation,
    Fig. 2
    a sectional view of the ID card of Fig.1 along the line II-II, and
    Fig. 3
    a section through a banknote with punched-out opening, which is covered with a security element according to an embodiment of the invention.
  • Fig. 1 shows a plan view of a transparent ID card 10 according to the invention in a schematic representation. The ID card 10 contains a portrait 12 of the cardholder and other personal data 14, in Embodiment the first and last name of the owner. In addition, the badge may include other data 16, such as date of birth, nationality, issuing authority, issue date, and the like.
  • In a partial area 18 of the ID card 10, a laser tipping image is arranged which contains two different information inscribed by means of a laser beam, in the exemplary embodiment the signature of the holder 20 and the validity date of the card 22. The two information 20 and 22 are, unlike the graphic representation of the Fig.1 , when viewing the ID card 10 not simultaneously, but only by tilting the card 10 in a different tilt angle recognizable.
  • The basic structure of the laser tipping image 18 will now be described with reference to FIG Fig. 2 explained in more detail, which is a section through the badge 10 along the line II-II of Fig. 1 shows. The badge 10 includes a transparent card body 24 and a transparent in the visible spectral range, laser-sensitive recording layer 26. The recording layer 26 may be a portion of the card body 24 or a separate layer. The recording layer 26 is provided with a surface relief in the form of a lenticular grid 28, which in the exemplary embodiment consists of a plurality of parallel cylindrical lenses.
  • The personal information 20 and 22 introduced into the laser tipping image are written into the recording layer 26 only after the lens grid 28 has been applied by means of a pulsed infrared laser. The laser beam is directed from different directions 30 and 32 to the lens grid 28. The individual cylindrical lenses focus the laser beam depending on the direction of irradiation on different small subregions 34 and 36 of the recording layer.
  • The effect of the laser radiation locally changes the optical properties of the recording layer 26, for example the layer is locally blackened. Looking later at the ID card 10 from the direction 30, the blackened portions 34 are visible because of the focusing effect of the cylindrical lenses, which are composed for the viewer to an image, in the embodiment of the inscribed signature 20. Correspondingly, the partial regions 36 inscribed in this direction can be recognized from the viewing direction 32 and are combined to form an image of the validity date 22 for the viewer.
  • It is understood that the badge 10 may have additional layers, for example one or more protective layers or functional layers provided with other security elements. In this case, only the transparency of the data carrier 10 in the area of the registered identifications 20, 22 must be retained. These further layers are not essential to the present invention and are therefore neither described nor illustrated in detail in the figures.
  • Another embodiment of the invention is in the Fig. 3 which shows a banknote 40 with a continuous punched opening 42. The opening 42 is completely covered on the front side of the banknote 40 with a transparent security element 44 according to the invention. The security element 44 has a transparent main body 46 and a transparent in the visible spectral range recording layer 48, in which, as described above, were written by laser beam information containing, for example, a serial number of the bill. The recording layer 48 is covered by a lenticular grid 50, which in the exemplary embodiment consists of a plurality of spherical lenses embossed in the transparent main body 46. Due to the action of the laser radiation, the recording layer 48 is blackened in some places, while the remaining areas of the recording layer 48 are unchanged transparent. The inscribed serial number can therefore be read from the corresponding viewing direction both in the top view and through the opening 42 of the banknote 40 from the rear side. The tilt effect disappears in a photographic or xerographic reproduction of the banknote.
  • Instead of the blackening, the laser irradiation can be used only for a local change of the refractive index or the polarization direction of the recording layer. For an adjustment of the security element 44 is further complicated.

Claims (19)

  1. A data carrier into which, by a laser beam, identifiers are introduced in the form of patterns, letters, numbers and/or images that are visible due to local changes in the optical properties of the data carrier, effected by the laser beam and resulting from material transformations, wherein the data carrier comprises a laser-sensitive recording layer that is transparent in the visible spectral range and that is provided with a surface relief in the form of a lens grid, such that the identifiers are introduced with the laser beam from different directions through the lens grid into the recording layer and are perceptible when viewed from those same directions, characterized in that the data carrier is transparent at least in the area of the introduced identifiers.
  2. The data carrier according to claim 1, characterized in that the changes in the optical properties of the data carrier are visible in transmitted light.
  3. The data carrier according to claim 1 or 2, characterized in that the changes in the optical properties of the data carrier are visible in reflected light.
  4. The data carrier according to at least one of claims 1 to 3, characterized in that the lens grid comprises cylindrical lenses and/ or spherical lenses.
  5. The data carrier according to at least one of claims 1 to 4, characterized in that the recording layer is formed by a non-self-supporting layer of a thickness of about 1 µm to about 800 µm.
  6. The data carrier according to at least one of claims 1 to 5, characterized in that the recording layer is disposed in the interior of the data carrier.
  7. The data carrier according to at least one of claims 1 to 6, characterized in that the identifiers comprise personal data, such as a signature, a birth date, a portrait or the like.
  8. The data carrier according to at least one of claims 1 to 7, characterized in that the identifiers comprise data relating to the data carrier, such as a validity period, a card number, information about the issuing authority or institute or the like.
  9. The data carrier according to at least one of claims 1 to 8, characterized in that the identifiers are present in screened form, the grid elements preferably being formed by rod-shaped pixels.
  10. The data carrier according to at least one of claims 1 to 9, characterized in that the identifiers that are perceptible from different directions are present nested within each other in the recording layer.
  11. The data carrier according to at least one of claims 1 to 10, characterized in that the data carrier exhibits an at least partially transparent main body, in or on which the recording layer and the lens grid are disposed.
  12. The data carrier according to at least one of claims 1 to 11, characterized in that the data carrier exhibits, in addition to the identifiers, black-and-white or colored impressions and/ or further laser inscriptions.
  13. The data carrier according to at least one of claims 1 to 12, characterized in that the data carrier is provided with one or more further security features, especially with luminescent, magnetic or electrical substances, or with optically variable structures, such as holographic structures.
  14. The data carrier according to at least one of claims 1 to 13, characterized in that the data carrier constitutes a value document, such as a banknote, an identification card or the like.
  15. The data carrier according to at least one of claims 1 to 13, characterized in that the data carrier constitutes a security element for application to a value document, such as a banknote, an identification card or the like.
  16. A value document, such as a banknote, identification card or the like, having a value document substrate having a window area or hole that is covered on one side or on both sides with a security element according to claim 15.
  17. A method for manufacturing a data carrier according to at least one of claims 1 to 15, in which
    - the laser-sensitive recording layer that is transparent in the visible spectral range is provided with the surface relief in the form of a lens grid, and
    - subsequently, in a transparent area of the data carrier, the identifiers are introduced with the laser beam from different directions through the lens grid into the recording layer, such that the identifiers are perceptible when the data carrier is later viewed from those same directions.
  18. The method according to claim 17, characterized in that the identifiers are introduced in a screening method, the grid elements preferably being formed by rod-shaped pixels.
  19. The method according to claim 18, characterized in that the grid elements are produced by irradiating the lens grid with laser pulses.
EP04803402A 2003-12-12 2004-12-01 Data support with identifications written thereon by means of a laser beam and method for production thereof Active EP1697146B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10358784A DE10358784A1 (en) 2003-12-12 2003-12-12 Data carrier with laser beam inscribed markings and method for its production
PCT/EP2004/013634 WO2005058610A2 (en) 2003-12-12 2004-12-01 Data support with identifications written thereon by means of a laser beam and method for production thereof

Publications (2)

Publication Number Publication Date
EP1697146A2 EP1697146A2 (en) 2006-09-06
EP1697146B1 true EP1697146B1 (en) 2012-02-15

Family

ID=34672782

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04803402A Active EP1697146B1 (en) 2003-12-12 2004-12-01 Data support with identifications written thereon by means of a laser beam and method for production thereof

Country Status (6)

Country Link
US (1) US8006908B2 (en)
EP (1) EP1697146B1 (en)
AT (1) AT545518T (en)
DE (1) DE10358784A1 (en)
ES (1) ES2379632T3 (en)
WO (1) WO2005058610A2 (en)

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Also Published As

Publication number Publication date
AT545518T (en) 2012-03-15
US20070063053A1 (en) 2007-03-22
ES2379632T3 (en) 2012-04-30
DE10358784A1 (en) 2005-07-14
US8006908B2 (en) 2011-08-30
WO2005058610A3 (en) 2006-02-09
WO2005058610A2 (en) 2005-06-30
EP1697146A2 (en) 2006-09-06

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