EP0980763A1 - Document de securité avec des colorants optiquement excitables pour validation - Google Patents

Document de securité avec des colorants optiquement excitables pour validation Download PDF

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Publication number
EP0980763A1
EP0980763A1 EP99115363A EP99115363A EP0980763A1 EP 0980763 A1 EP0980763 A1 EP 0980763A1 EP 99115363 A EP99115363 A EP 99115363A EP 99115363 A EP99115363 A EP 99115363A EP 0980763 A1 EP0980763 A1 EP 0980763A1
Authority
EP
European Patent Office
Prior art keywords
value
security document
dyes
security
laser
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
EP99115363A
Other languages
German (de)
English (en)
Other versions
EP0980763B1 (fr
Inventor
Roland Dr. Gutmann
Benedikt Dr. Ahlers
Frank Kappe
Ralf Dr. Paugstadt
Arwin Franz-Burgholz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bundesdruckerei GmbH
Original Assignee
Bundesdruckerei GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bundesdruckerei GmbH filed Critical Bundesdruckerei GmbH
Publication of EP0980763A1 publication Critical patent/EP0980763A1/fr
Application granted granted Critical
Publication of EP0980763B1 publication Critical patent/EP0980763B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/23—Identity cards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • B41M5/287—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using microcapsules or microspheres only
    • B42D2035/34—

Definitions

  • the invention relates to a value and security document according to the preamble of claim 1.
  • the invention is based on a prior art, such as in the US 4,738,901.
  • a value and security document in Form of copy-protected paper is provided, in which phosphor particles are embedded. It is a copy protection, because with that Copier-associated lasers excite the phosphor particles and those of Radiation emitted by the phosphor particles is emitted by a second detector added, which accordingly tells the copier that it is a protected document. An authenticity check of such a value and Security document is not provided for in this copy protection process and not possible.
  • the object of the present invention is to carry out an authenticity check of value and To propose security documents with optically stimulable dyes which is a defined emission spectrum of the optically excited value and Security document can be recorded and therefore a characteristic spectrum for this value and security document which is characteristic of both in the Security document embedded dye as well as for the material of the Security document itself.
  • the present invention is based on the fact that the introduction of certain optically stimulable dyes in a security document so that the optical excitation of the value and security document in the value and Security document embedded dyes in resonance with the material of the Value and security document to get a sharply defined To emit spectrum of all excited materials.
  • the laser dyes can be directly in one Color component (resins or pigments) can be integrated.
  • Color component resins or pigments
  • Laser dye is understood to be a very high excitable by laser beam efficiently fluorescent material in any physical state, d. H. firmly liquid or gaseous.
  • One advantage of laser dyes compared to fluorescent substances is the sharp emission peaks at defined emission wavelengths over the entire fluorescence range of the laser dyes.
  • sharp emission peaks only occur if the laser-excitable fluorescent substances used are incorporated into an optical resonator. Only through this resonance generation do the sharp emission peaks result, which are then characteristic both of the geometry and optical properties of the resonator used and of the ones used Are fluorescent substances.
  • the emission intensity can be reduced by installing the laser dyes in one Increase the resonator.
  • the laser dye is coated on both sides containing polymer layers with metallic or dielectric layers a higher refractive index is necessary.
  • this also significantly increases security, because of the geometry and optical properties of the resonator, the number of peaks and their Set position in the wavelength range of fluorescence. In addition, also set the peak width using the geometry used.
  • the dye s directly into a To bring in the layer and / or print position of the value and security document, wherein the reflective and / or dielectric layers are parts of the value and Represent security document.
  • the laser-active element is not formed as part of the layer structure of the value and security document, but that the laser-active elements are produced separately from the value and security document in the form of independent resonators and only then in the form of pigment Platelets, chopsticks or spheres, the size of which is, for example, a few ⁇ m, are introduced into or placed on the document.
  • the production of such resonators for applications in security printing products is feasible, for example, using thin-film technology.
  • the layer composite is comminuted, for example by breaking.
  • the sheet-like fragments obtained in this way which are also referred to below as flakes or pigment platelets, with a thickness of 1 - 10 ⁇ m and an area ⁇ 20 x 20 ⁇ m 2, can then, depending on their size , be printed in appropriate inks (e.g. steel engraving , Screen printing, offset, letterpress) or be integrated into the paper and foil material of the security document.
  • appropriate inks e.g. steel engraving , Screen printing, offset, letterpress
  • laser dyes can be used as a hidden or two-stage security feature that can be controlled with UV light, because, as already mentioned, all laser dyes show broadband UV fluorescence. The following sections describe ways of incorporating laser dyes into different components of security and value products.
  • the incorporation of polymer-bound laser dyes into the paper can either by directly adding the bound dyes to the raw material mixture or by screen printing after drying respectively.
  • the direct addition has the economic disadvantage that large Amounts for sufficient luminance must be added.
  • On subsequent application to the paper by screen printing requires much smaller amounts of laser dyes and enables additionally a structuring in the sense of a watermark.
  • At transparent, colorless laser dyes could be "hidden” Watermark "can be introduced into the paper. When used different laser dyes made hidden, colored watermarks produce.
  • the Card area In comparison to the direct insertion into or onto the paper, the Card area a very thin plastic film "doped" with the laser dyes or printed. Due to the specific map structure, it can be used with Insert the foil provided with laser dyes in the middle of the laminate composite. This leads to chemical-physical protection of the dyes Environmental influences, e.g. UV light and for a higher security through the close material bond between laser dye and polymer layer.
  • plastic threads are partially metallized as window threads in security and security paper during manufacture.
  • window threads are also provided with a micro script.
  • the micro script can be produced chemically (etching) or physically (laser ablation).
  • the exposed areas appear as windows.
  • the connection to laser dyes could again be made via the plastic phase.
  • the laser dyes can be easily integrated into the plastic matrix. In the case of excitation from above, below or from the side by means of a suitable laser light, the micro-writing would then light up, for example blue, depending on the laser dye selected.
  • fibers or planchettes could also be provided with laser dyes.
  • fibers there are options for introducing the laser dyes into the fiber material, filling the fibers when using hollow fibers (d i > 10 ⁇ m) or one doped with laser dyes.
  • hollow fibers d i > 10 ⁇ m
  • polymer matrix d ⁇ 2 ⁇ m
  • Planchettes can be coated or doped in a similar way to fibers.
  • the present invention is not based on the excitation by means of a Lasers limited; other high-energy optical systems can also be used Excitation media are used, such as. B. a flash lamp, sodium or High pressure lamps and the like. A suggestion is also possible Luminescent diodes not only in the visible, but also in the invisible Wavelength range possible.
  • laser dyes in valuable and security products are in direct insertion into a printing ink.
  • These include steel engraving, screen printing and Offset inks (wet, dry offset and indirect letterpress printing) as well as inks for letterpress printing (numbering) and other for value and Security printing relevant printing process.
  • Laser dyes whether in molecular form or as a solid matrix, are necessary. If resonators are used, their shape (usually Platelets but also balls) and size for the transfer from the color to the Decisive material. While in steel engraving and screen printing in general Dye pigments up to a size of 20 ⁇ m printed without problems there is an upper limit of 2 to 4 ⁇ in the offset.
  • Form has an impact on manufacturing costs, the Can be mixed into the printing ink (rubbing chair), the stability, the light output and the spectral distribution / line shape.
  • Spherical structures are simpler manufacture and are mechanically more stable. This is at the expense of one poorer processing properties and lower resonator efficiency.
  • the production of platelets is technically complex and expensive, but usually leads to to a higher luminous efficacy as well as defined, adjustable peak patterns.
  • the use of tiles allows the use of the Radiation geometry, you get anisotropic radiation. So you could theoretically a high one with a thin ink application, like with offset printing Achieve emission intensity.
  • the optical effects are reduced with a decrease in the active layer thickness (steel engraving up to 20 ⁇ m, offset 1 to 4 ⁇ m). Due to the color components of printing inks, it is also conceivable Integrate dye solutions directly into a component of the color. A Offer the opportunity to do this e.g. the resin components (rosin) of highly viscous steel engraving colors or a combination with existing ones Color or effect pigments through joint encapsulation. Inks are a stabilizer for unencapsulated laser dye solutions. In With regard to the color matching and the effect, the colors, which as Carrier media for the laser dyes do not have strong covering properties have and if possible be transparent.
  • UV excitation would be one Mixed fluorescence consisting of portions of EL pigments as well as portions of the laser dyes generate an excitation by means of a suitable one Laser beam would probably only excite the laser dyes, as for one Excitation of EL pigments using a pulsed laser beam Field portion of the laser light is unsuitable, and eventually one would electrical excitation to make the EL pigments glow.
  • FIG. 1 generally shows a pigment lamina 1 which consists of two reflective layers 2 which are essentially parallel to one another and have a mutual spacing and which are applied to a polymer layer 4.
  • the reflective layers 2 consist of an oxide layer, for. As silicon dioxide, silicon liquid, tin oxide, titanium oxide and the like. But it can also be a metallic layer. It is only essential that two reflecting layers 2 lie opposite one another, which, as it were, receive the polymer layer as a mirror between them and the laser dyes 3 are embedded in the polymer layer 4. In addition, it can be provided that, according to FIG. 1, the end faces of the pigment plate 1 are also provided with the reflective layers 2.
  • the polymer layer 4 consists of a plastic polymer. Instead of a polymer layer, however, a glass layer or another transparent support can be used, which must be both transparent to the exciting wavelength and transparent to the emitting wavelength. It is therefore not necessary to use a polymer layer 4, but any transparent carrier layers can be used. It is not necessary that they be transparent in visible light, but that they can also be transparent in invisible light. In another embodiment, the electrical layers mentioned above can also be omitted and only reflecting layers can be present on the end faces.
  • Rhodamine 6G can also be used.
  • the invention is not limited; it can also provide that such Particulate and molecular laser dyes 3 are clustered or are distributed very differently in the density in the polymer layer 4. A uniform density distribution is therefore not necessary for the solution.
  • the example according to FIG. 1, with one used as pigment plate 1 Dye 3 is not limitative of the present invention. Because it can instead of the pigment plate shown here with the two together opposite and reflecting layers 2 also Security document can be used, which this pigment plate 1 not includes.
  • the two reflective layers would then be directly in the Security document integrated at a mutual distance parallel to each other and between the two reflective layers is the one with Carrier layer doped with laser dye molecules, e.g. a polymer layer, arranged.
  • the result is a laser-active element or a laser-active element Area on the security document that comes from between the two reflective layers embedded and doped with laser dye Carrier layer exists. This means that the illustration according to FIG. 1 can also be used magnified ten thousand times directly as a layered document be considered.
  • the pigment platelets for the distribution of the pigment platelets in paper 5 the same applies as above for the distribution of the laser dyes 3 in the Polymer layer 4 was said. It is not necessary for the pigment platelets to have a solution are arranged in a relatively thin distribution in the paper. You can also form clusters; they can also be distributed on the surface or they can also be close to each other. In areas where there are flakes overlay, the irradiated radiation can be impeded, because the pigment platelets partially cover each other and thus the excitation is weakened. There are then interference effects which the emitted Attenuate radiation. Such a distribution in the paper should be chosen be that the pigment platelets do not interfere and interfere with each other.
  • Figure 3 shows a similar representation where it can be seen that the pigment platelets 1 are embedded in a plastic film 6.
  • the plastic film can have any thickness.
  • Figure 4 shows that a printing ink 7 is arranged on a carrier 8, wherein this carrier 8 can be a value and security document.
  • the pigment platelets 1 are embedded.
  • the ink 7 itself should be on the emitted spectrum of the pigment platelets 1 can be adjusted to a to achieve sufficient emission radiation.
  • the printing ink must also to be transparent to the stimulating as well as the emitted radiation to ensure any excitation of the pigment platelets 1 at all.
  • FIG. 5 shows the integration of a Window thread in a value and security document 9. This is around a window thread 10, which is known in view of the value and Security document 9 is integrated, wherein Figure 5a shows that the Window thread 10 is recessed in the area of the label 11, and / or Has cup-shaped depressions or has recesses which with the Laser dye are filled. So that means a color is used that is doped with the pigment plate 1. Will the window thread 10 now with the stimulated appropriate light, then this printing ink comes very strong Illuminate as shown in Figure 5a.
  • FIG. 6 shows a cross section through the representation according to FIG. 5, it being evident that a color 13 doped with pigment platelets 1 is applied to the paper or plastic substrate 5.
  • the metallized thread (window thread 10), which has the microtext shown in FIG. 5a, is arranged above it. Instead of the specified text, a geometric pattern can also be applied.
  • FIG. 7 shows a cross section through a fiber 15, which fiber can be a plastic thread, a textile thread, a glass thread, or the like.
  • a fiber 15 which fiber can be a plastic thread, a textile thread, a glass thread, or the like.
  • the fiber cladding 14 has a different optical refractive power than, for example, the fiber 15 itself.
  • the invention is not based on the integration of such pigment platelets 1 in such a fiber 15 is limited. It is in a further development of the invention suggested that instead of the pigment platelets, the laser dyes in molecular Distribution can be introduced directly into the material of the fiber 15. Instead of Pigment platelets 1 which are shown in FIG. 7 then occur directly before mentioned laser dyes 3 in molecular distribution. To now one corresponding resonance excitation of these laser dyes 3 in the fiber 15 7a ensure that the end faces 17, 18th this fiber 15 are mirrored. Now such a fiber 15 from the outside excited with a suitable radiation, then there is a pumping process between the end faces 17, 18 through the fiber 15, where now through the Laser dyes 3 arranged in molecular distribution directly for lighting up to be brought. Corresponding emitted laser radiation then occurs on the End faces 17, 18, as is known in a fiber laser.
  • FIG. 8 shows the integration of a printing ink 7 on a paper 5, the aforementioned pigment platelets being arranged in so-called polymer sleeves 19.
  • Pigment platelets are thus introduced into a matrix, a polymer shell 19, and this acts like a microencapsulation on the pigment platelets, which can thereby be integrated in the printing ink 7 at low cost.
  • the polymer sleeve 19 can also serve as a carrier for an electroluminescent excitable pigment 20. This has the advantage that when the printing ink 7 is excited by means of a suitable laser radiation, the pigment platelets 1 first light up. If a pigment 20 that can be excited via electroluminescence or another security pigment is additionally used, then additional radiation can be generated which is superimposed on the other radiation.
  • Such pigments 20 can, for example, be illuminated by a corresponding electrostatic field, and their radiation can be superimposed on the radiation emitted by the pigment platelets 1.
  • the wavelength of the light emitted by the pigments 20 can shift due to the laser emission of the pigment platelets 1. This leads to an improved safety effect of this arrangement, because this mutually superimposing radiation is very difficult to imitate.
  • a plastic card 21 is shown in the known manner when illuminated with daylight, which has a photo area 22 and a labeling field 23. If this plastic card 21 is irradiated with laser light, the appearance according to FIG. 10 results. The laser light is used to excite hidden features.
  • a first security element 24 is present, which is applied into the inscription space via the photo surface 22. In the exemplary embodiment, it consists of three different sector colors 25, which complement each other to form a circle, which consequently only light up when excited with the aforementioned laser light.
  • a window thread 10 is also shown, which extends through both the photo surface 22 and the labeling field 23 and other surfaces of the plastic card 21.
  • This window thread can also have the aforementioned microtext; it can be designed to be illuminated.
  • the printing thread 26 can not only consist of a metallized thread, but which is printed in the form of a print and extends over the image and the labeling field in order to make forgeries visible in these areas.
  • another security element 27 is shown in the form of a geometric element, which, for. B. is suitable for machine evaluation.
  • FIGS. 11 and 12 Another example of a personal document 28 is shown in FIGS. 11 and 12 differently concealed features. Again, it is one Photo area 22 and a labeling field 23 available. It can be seen in FIG. that two overlapping printing threads 26 are provided, both the Cover photo area 22 as well as labeling field 23. As another Example is the name of the holder of the personal document with a provided illuminating bar 29, which was overprinted with a printing ink, in which the pigment platelets 1 were distributed.
  • a bank note 30 which has a certain number of known features when illuminated with daylight.
  • the security feature 31 which lights up in different colors in the form of a rosette, has now been excited accordingly with the laser light.
  • the value field 33 is overprinted with the same number but shifted to it, which lights up when excited with a laser of the appropriate color and energy. So this is also an additional security element.
  • the laser dyes shown here show fluorescence in the UV range. If the pigment platelets 1 provided with the laser dyes are excited, then the previously described sharp emission lines in the emission spectrum occur due to the described resonance phenomena. Such an emission spectrum is now extremely suitable for machine evaluation of the authenticity features of such value and security documents.
  • a number of security features can be queried and evaluated, such as B. Wavelength of the emitted radiation peaks, mutual position of the peaks, full width at half maximum, number of peaks and peak amplitude. These parameters depend on the laser color used, the excitation energy and the materials in which the laser color is embedded.
EP99115363A 1998-08-14 1999-08-04 Document de securité avec des colorants optiquement excitables pour validation Expired - Lifetime EP0980763B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19836813 1998-08-14
DE19836813A DE19836813A1 (de) 1998-08-14 1998-08-14 Wert- und Sicherheitsdokument mit optisch anregbaren Farbstoffen zur Echtheitsprüfung

Publications (2)

Publication Number Publication Date
EP0980763A1 true EP0980763A1 (fr) 2000-02-23
EP0980763B1 EP0980763B1 (fr) 2003-10-15

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EP99115363A Expired - Lifetime EP0980763B1 (fr) 1998-08-14 1999-08-04 Document de securité avec des colorants optiquement excitables pour validation

Country Status (4)

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US (1) US6234537B1 (fr)
EP (1) EP0980763B1 (fr)
AT (1) ATE251994T1 (fr)
DE (2) DE19836813A1 (fr)

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EP2168780A3 (fr) * 2008-09-29 2012-03-14 Giesecke & Devrient GmbH Caractéristique de sécurité pour la sécurisation d'objets de valeur
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JP4997952B2 (ja) * 2006-12-14 2012-08-15 日本電気株式会社 光通信システム、コンテンツ送信装置およびコンテンツ受信装置
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WO2010028085A2 (fr) * 2008-09-03 2010-03-11 The Regents Of The University Of California Système de suivi d'objet chirurgical
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DE102010007566A1 (de) 2010-02-10 2011-08-11 Tailorlux GmbH, 48565 Lumineszentes Sicherheitselement für den Produktschutz
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DE59907352D1 (de) 2003-11-20
DE19836813A1 (de) 2000-02-24
ATE251994T1 (de) 2003-11-15
US6234537B1 (en) 2001-05-22

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