EP1673233B1 - Systeme de codage pour documents de valeur - Google Patents

Systeme de codage pour documents de valeur Download PDF

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Publication number
EP1673233B1
EP1673233B1 EP04765836A EP04765836A EP1673233B1 EP 1673233 B1 EP1673233 B1 EP 1673233B1 EP 04765836 A EP04765836 A EP 04765836A EP 04765836 A EP04765836 A EP 04765836A EP 1673233 B1 EP1673233 B1 EP 1673233B1
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EP
European Patent Office
Prior art keywords
coding
emission
luminescent
luminescent substances
stated
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.)
Expired - Lifetime
Application number
EP04765836A
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German (de)
English (en)
Other versions
EP1673233A2 (fr
Inventor
Thomas Giering
Wolfgang Rauscher
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 GmbH
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Giesecke and Devrient GmbH
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Publication of EP1673233A2 publication Critical patent/EP1673233A2/fr
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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
    • B42D25/29—Securities; Bank notes
    • 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
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Definitions

  • the invention relates to a coding for objects to be protected.
  • WO 01/48311 has proposed to provide the security paper with at least two types of mottled fibers which differ in their luminescent properties. In each case, only one of the different mottled fibers is present in defined, non-overlapping partial regions of the security paper, so that coding can be generated by the geometric arrangement of the partial regions and the presence or absence of mottling fibers.
  • the number of geometrical arrangements that can be produced is limited.
  • the present invention seeks to propose a coding with an increased number of coding options.
  • the coding comprises at least one pair of mutually associated luminescent substances with a first and a second luminescent substance which emit in a common emission region lying outside the visible spectral range.
  • the emission spectra of the first and the second luminescent substance overlap in at least a partial region of the said emission region such that the emission spectrum of the first luminescent substance is reflected by the emission spectrum the second luminescent substance is characteristically supplemented.
  • the common emission range of the two luminescent substances extends from about 750 nm to about 2500 nm, preferably from about 800 nm to about 2200 nm, particularly preferably from about 1000 nm to about 1700 nm. If the luminescence emission relevant for the coding lies in the Range above about 1000 nm, so it is denied the comparatively simple detection by commercially available silicon-based infrared detectors.
  • the first and / or second luminescent substance is formed on the basis of a doped host lattice.
  • These luminescent substances may e.g. be excited that directly into the absorption bands of the luminescent ions is irradiated and then emit them.
  • absorbent host lattices or so-called “sensitizers” can be used, which absorb the excitation radiation and transmit it to the luminescent ion, which then emits itself with its characteristic wavelengths. It is understood that the host lattices and / or the dopants for the two luminescent substances can be different in order to obtain different excitation and / or emission ranges.
  • the host lattice absorbs in the visible spectral range and optionally additionally in the near infrared range up to to about 1.1 ⁇ m.
  • the excitation can then take place via light sources, such as halogen lamps, flash lamps, LEDs, lasers or xenon arc lamps, with high efficiency, so that only small quantities of the luminescent substance are required.
  • the small amount of substance makes it difficult to detect the substance used for potential counterfeiters.
  • luminescent substances are used which absorb even in the visible spectral range, preferably over the largest part of the visible spectral range, particularly preferably into the near infrared range. Even then, emissions in these more easily accessible spectral ranges are suppressed.
  • the first and / or second luminescent substance is a luminescent substance based on a host lattice doped with rare earth elements. Neodymium, erbium, holmium, thulium, ytterbium, praseodymium, dysprosium or a combination of these elements are particularly suitable as dopants.
  • the first and / or second luminescent substance is a luminescent substance based on a host lattice doped with a chromophore, wherein the chromophore is selected from the group scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper and zinc is.
  • the dopants and host lattices mentioned in WO 02/070279 are also suitable for use as luminescent substances in codings according to the invention.
  • At least one of the host lattices may be doped with multiple chromophores. It is understood that the two variants can be combined so that one of the luminescent substances based on a rare earth doped host lattice, the other luminescent substance is formed based on a host lattice with a chromophore.
  • the host lattice may, for example, have a perovskite structure or a garnet structure. At least one of the host lattices can also be formed by a mixed crystal. Further possible embodiments of the host lattice and of the dopants are listed in EP-B-0 052 624 or EP-B-0 053 124, the disclosures of which are incorporated in the present application in this respect.
  • the first and second luminescent substances are formed on the basis of different host lattices which have a crystal field of different strengths and which are each doped with the same dopant. Due to the influence of the crystal field at the location of the dopant whose electronic levels are shifted from the undisturbed state. As the magnitude of the shift varies for the different levels, shifts in the energetic distances of the electronic levels, and thus also in the position of the emission lines, result depending on the strength and symmetry of the crystal field. If the same dopant is chosen for the first and second luminescent substance, small displacements of the associated emission lines relative to the undisturbed emission can be adjusted in a controlled manner by suitable choice of host lattices with different crystal fields.
  • Said subarea, in which the luminescence spectra of the first and second luminescent substance overlap additionally, preferably has a width of 200 nm or less, preferably of 100 nm or less on. In a preferred embodiment, the portion extends from about 850 nm to about 970 nm.
  • the portion extends from about 920 nm to about 1060 nm, or from about 1040 nm to about 1140 nm, or from about 1100 nm to about 1400 nm, preferably from about 1100 nm to about 1250 nm, more preferably from about 1120 nm to about 1220 nm, or from about 1300 nm to about 1500 nm, or from about 1400 nm to about 1700 nm
  • the first and the second luminescent substance advantageously each have at least one emission line in the said subregion whose positions have a spacing of about 50 nm or less, preferably about 30 nm or less, more preferably about 20 nm or less, most preferably of about 10 nm or less.
  • the emission lines are narrow-band and in particular have a half-width of about 50 nm or less, preferably about 30 nm or less, more preferably about 20 nm or less, most preferably about 10 nm or less.
  • the coding contains a further luminescent substance which has at least one emission line outside the mentioned subregion.
  • the emission line is preferably outside the visible spectral range, in particular in the infrared spectral range above 1100 nm.
  • “Infrared spectral range” is understood according to the invention to be the wavelength range from 750 nm and greater, preferably 800 nm and greater.
  • the coding may also comprise a plurality of pairs of mutually associated luminescent substances, each of which may be formed as described.
  • the pairs of luminescent substances are preferably matched to one another in such a way that the partial regions in which the emission spectra of the two luminescent substances overlap in a complementary manner are different for different pairs.
  • the additional luminescent substances can emit in the same subregion of the spectrum and further supplement the emission spectrum of the luminescent substance pair according to the invention.
  • the various dopants and host lattices By varying and combining the various dopants and host lattices, it is possible to produce a plurality of pairs of luminescent substances or luminescent substance mixtures whose emission lines relevant for the coding overlap each other in different spectral subregions. As a result, very compact codings can be formed which occupy only little space on the object to be protected at high information density.
  • the coding can be formed in this case by the presence or absence of one or more luminescent substances within the subregion of the emission spectrum according to the invention or else also individual or several luminescent substances in different subregions.
  • Items to be secured include, in particular, value documents such as banknotes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, credit cards, identity cards, passports and other identity documents. and security papers for the production of such documents of value into consideration.
  • value documents such as banknotes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, credit cards, identity cards, passports and other identity documents. and security papers for the production of such documents of value into consideration.
  • At least one of the luminescent substances can be printed on the document of value.
  • a plurality of the luminescent substances for example an associated pair of luminescent substances, can also be printed together in a printing ink onto the document of value.
  • the printing inks used for this can be transparent or contain additional color pigments which must not impair the detection of the luminescent substances. They preferably have transparent regions in the excitation region and in the considered emission region of the luminescent substances.
  • the document of value preferably comprises a substrate which is formed by a printed or unprinted cotton fiber paper, a cotton / synthetic fiber paper, a cellulose-containing paper or a coated, printed or unprinted plastic film.
  • a laminated multilayer substrate is also possible.
  • One or more of the luminescent substances can also be introduced into the volume of the value document, in particular the value document substrate.
  • the introduction of the luminescent substances into the volume of a paper substrate can be carried out, for example, by a process as described in the publications EP-A 0 659 935 and DE 10120 818. The disclosures of said documents are included in the present application in this respect.
  • the luminescent substances may also be randomly added to the pulp prior to sheet formation.
  • FIG. 1 shows an object 10 to be protected, which is provided with a coding 11 according to an embodiment of the invention.
  • the coding 11 contains two pairs of mutually associated luminescent substances 12, 13, and 14, 15, which show excitation emissions in the infrared spectral range between 1000 and 1500 nm, which overlap each other in a sub-area in each case supplementary, as described in more detail below.
  • regions 16 with the first pair of luminescent substances 12, 13, regions 17 with the second pair of luminescent substances 14, 15 and regions 18 without luminescent substances along predetermined geometrical patterns, any information, for example a product code, can be represented by the coding 11.
  • the luminescent substances 12 and 13 are each formed on the basis of a neodymium-doped host lattice and have, as in the left-hand part of FIG. 2 shown, in each case an emission line in the range around 1064 nm. However, the two luminescent substances 12, 13 are formed on the basis of different host lattices, which generate a crystal field of different strengths at the location of the neodymium ion.
  • the peak position of the luminescence curve 22 of the first luminescent substance 12 is at a wavelength of 1065 nm and the peak position of the Lumineszenzverlaufs 23 of the second luminescent substance 13 at about 1090 nm.
  • the two luminescence spectra 22, 23 overlap each other in the partial region of approximately 1000 nm to approximately 1150 nm such that the emission spectrum 22 of the first luminescent substance 12 is supplemented by the emission spectrum 23 of the second luminescent substance 13. Due to the short distance between the two lines, the presence of the two luminescent substances 12 and 13 can not practically be detected without prior knowledge of the substances used from the enveloping emission curve, so that the coding has a high protection against counterfeiting. Since the spectrum is generated by different matrices in which the luminescence ions are located in different crystal fields, there are also no matrices which, taken separately, produce the same emission spectrum.
  • the luminescent substances 14,15 are formed in the embodiment in each case on the basis of a doped with a chromophore host lattice, wherein the chromophore from the group scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper and zinc is selected.
  • the envelope of the luminescence emissions of the two luminescent substances 14, 15 can practically not be removed from the type of luminescent substances used without further information.
  • the luminescence emission of the aforementioned luminescent substances 12 and 13 at a wavelength of about 1300 nm is shown. Also there arise close to each other, narrow emission lines 32 and 33, the common luminescence emission can only be separated with high-resolution detectors.
  • the coding 11 may contain, in addition to the two pairs of luminescent substances 12, 13 or 14, 15, also a further luminescent substance which exhibits an emission at a wavelength above 1100 nm after excitation.
  • the emission wavelength is tuned so that it does not fall into the overlapping regions of the first or second pair of luminescent substances.
  • the presence or absence of the further luminescent substance in certain areas can also be used for coding and thus further increases the number of coding possibilities.
  • a ternary code can be represented, in which the state "0" through a region without luminescent substances, the state “1” through a region with the first luminescent substance pair 12,13 and the state “2" a region with the second luminescent substance pair 14, 15 is represented.

Landscapes

  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Luminescent Compositions (AREA)
  • Credit Cards Or The Like (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Analogue/Digital Conversion (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Claims (18)

  1. Codage (11) comprenant au moins une paire de substances luminescentes conjuguées (12, 13, ou 14, 15), avec une première et une seconde substance luminescente qui émettent dans une plage d'émission commune, située à l'extérieur de la plage spectrale visible, les spectres d'émission de la première et de la seconde substances luminescentes se chevauchant dans au moins une plage partielle de ladite zone d'émission, de telle sorte que le spectre d'émission de la première substance luminescente est complété de façon caractéristique par le spectre d'émission de la seconde substance luminescente.
  2. Codage (11) selon la revendication 1, caractérisé en ce que ladite plage d'émission s'étend d'environ 750 nm jusqu'à environ 2500 nm, de préférence d'environ 800 nm jusqu'à environ 2200 nm, avec une préférence particulière d'environ 1000 nm jusqu'à environ 1700 nm.
  3. Codage (11) selon la revendication 1 ou 2, caractérisé en ce que la première et/ou la seconde substance luminescente est/sont formée(s) sur la base d'une grille-hôte dopée.
  4. Codage (11) selon au moins l'une quelconque des revendications 1 à 3, caractérisé en ce que la première et/ou la seconde substance luminescente est/sont formée(s) sur la base d'une grille hôte dopée avec des éléments de terre rare.
  5. Codage (11) selon la revendication 4, caractérisé en ce que la grille hôte est dopée avec du néodyme, de l'erbium, du holmium, du thulium, de l'ytterbium, du praséodyme, du dysprosium ou une combinaison de ces éléments.
  6. Codage (11) selon au moins l'une quelconque des revendications 1 à 5, caractérisé en ce que la première et/ou la seconde substance luminescente est/sont formée(s) sur la base d'une grille hôte dopée avec un chromophore, le chromophore étant sélectionné parmi le groupe scandium, titane, vanadium, chrome, manganèse, fer, cobalt, nickel, cuivre et zinc.
  7. Codage (11) selon la revendication 6, caractérisé en ce qu'au moins l'une des grilles hôtes est dopée avec plusieurs chromophores.
  8. Codage (11) selon au moins l'une quelconque des revendications 3 à 7, caractérisé en ce qu'au moins l'une des grilles hôtes est formée par un cristal mixte.
  9. Codage (11) selon au moins l'une quelconque des revendications 3 à 8, caractérisé en ce que la première et la seconde substance luminescentes sont fondées sur la base de différentes grilles hôtes, qui présentent un champ cristallin d'épaisseur différente et qui sont dopées chacune avec la même substance de dopage.
  10. Codage (11) selon au moins l'une quelconque des revendications 1 à 9, caractérisé en ce que ladite zone partielle, dans laquelle les spectres d'émission de la première et de la seconde substance luminescente se chevauchent de façon complémentaire, présente une largeur de 200 nm ou moins, de préférence de 100 nm ou moins.
  11. Codage (11) selon au moins l'une quelconque des revendications 1 à 10, caractérisé en ce que ladite zone partielle, dans laquelle les spectres d'émission de la première et de la seconde substance luminescente se chevauchent de façon complémentaire, s'étend d'environ 850 nm jusqu'à environ 970 nm, ou d'environ 920 nm jusqu'à environ 1060 nm, ou d'environ 1040 nm jusqu'à environ 1140 nm, ou d'environ 1100 nm jusqu'à environ 1400 nm, de préférence d'environ 1100 nm jusqu'à environ 1250 nm, et avec une préférence particulière d'environ 1120 nm jusqu'à environ 1220 nm, ou d'environ 1300 nm jusqu'à environ 1500 nm, ou d'environ 1400 nm jusqu'à environ 1700 nm.
  12. Codage (11) selon au moins l'une quelconque des revendications 1 à 11, caractérisé en ce que la première et la seconde substance luminescente présentent chacune dans ladite zone partielle au moins une ligne d'émission dont les positions présentent un espacement d'environ 30 nm ou moins, de préférence d'environ 20 nm ou moins, avec une préférence particulière d'environ 10 nm ou moins.
  13. Codage (11) selon au moins l'une quelconque des revendications 1 à 12, caractérisé en ce que le codage contient une autre substance luminescente qui présente au moins une ligne d'émission située à l'extérieur de ladite zone partielle.
  14. Codage (11) selon la revendication 13, caractérisé en ce que la au moins une ligne d'émission est située à l'extérieur de la plage spectrale visible, la ligne d'émission étant située de préférence dans la plage spectrale infrarouge au-dessus de 1100 nm.
  15. Codage (11) selon au moins l'une quelconque des revendications 1 à 14, caractérisé en ce que le codage présente plusieurs paires de substances luminescentes conjuguées, comme indiqué dans les revendications 1 à 14.
  16. Codage (11) selon la revendication 15, caractérisé en ce que les zones partielles, dans lesquelles les spectres d'émission de la première et de la seconde substances luminescentes d'une paire se chevauchent en se complétant réciproquement, sont différentes pour différentes paires de substances luminescentes conjuguées.
  17. Codage (11) selon au moins l'une quelconque des revendications 1 à 16, caractérisé en ce que le codage présente au moins une seconde substance luminescente, qui émet également dans la zone partielle du spectre, et le spectre d'émission de la première et/ou de la seconde substance luminescente est complété de façon caractéristique.
  18. Système de codage pour des documents de valeur comprenant au moins une paire de substances luminescentes conjuguées (12, 13 ; ou 14, 15), avec une première et une seconde substance luminescente qui émettent dans une plage d'émission commune, située à l'extérieur de la plage spectrale visible, le spectre d'émission de la première et de la seconde substance luminescente se chevauchant dans au moins une zone partielle de ladite plage d'émission de telle sorte que le spectre d'émission de la première substance luminescente est complété de façon caractéristique par le spectre d'émission de la seconde substance luminescente et les documents de valeur à différencier sont équipés avec différentes premières et/ou secondes substances luminescentes.
EP04765836A 2003-10-08 2004-10-05 Systeme de codage pour documents de valeur Expired - Lifetime EP1673233B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10346687A DE10346687A1 (de) 2003-10-08 2003-10-08 Codierungssystem für Wertdokumente
PCT/EP2004/011133 WO2005035271A2 (fr) 2003-10-08 2004-10-05 Systeme de codage pour documents de valeur

Publications (2)

Publication Number Publication Date
EP1673233A2 EP1673233A2 (fr) 2006-06-28
EP1673233B1 true EP1673233B1 (fr) 2007-02-21

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EP04765836A Expired - Lifetime EP1673233B1 (fr) 2003-10-08 2004-10-05 Systeme de codage pour documents de valeur

Country Status (10)

Country Link
US (1) US7927511B2 (fr)
EP (1) EP1673233B1 (fr)
CN (1) CN100415538C (fr)
AT (1) ATE354480T1 (fr)
DE (2) DE10346687A1 (fr)
ES (1) ES2278339T3 (fr)
MA (1) MA28136A1 (fr)
RU (1) RU2344050C2 (fr)
TN (1) TNSN06102A1 (fr)
WO (1) WO2005035271A2 (fr)

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EP2996184A1 (fr) 2014-09-09 2016-03-16 Paul Scherrer Institut Procédé pour produire une couche de diffusion de gaz et pile à combustible comprenant une telle couche
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FR3139029A1 (fr) 2022-08-25 2024-03-01 Oberthur Fiduciaire Sas Procédé d’authentification ou d’identification d’un document de sécurité

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DE19804024A1 (de) * 1998-02-02 1999-08-05 Giesecke & Devrient Gmbh Wertdokument
DE19804021A1 (de) * 1998-02-02 1999-08-05 Giesecke & Devrient Gmbh Wertdokument
US6380547B1 (en) * 1998-06-09 2002-04-30 Manuel E. Gonzalez Tagging compositions and methods
DE19962790A1 (de) 1999-12-23 2001-06-28 Giesecke & Devrient Gmbh Sicherheitspapier mit aufgebrachter Codierung aus lumineszierenden Melierfasern
FR2813134B1 (fr) * 2000-08-21 2004-01-16 Banque De France Procede d'authentification de documents sensibles
DE10111116A1 (de) * 2001-03-08 2002-09-19 Giesecke & Devrient Gmbh Wertdokument
DE10120818A1 (de) * 2001-04-27 2002-10-31 Giesecke & Devrient Gmbh Verfahren und Vorrichtung zum Einbringen von Merkmalsstoffen in eine Papierbahn

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RU2006115169A (ru) 2008-01-10
US20070202352A1 (en) 2007-08-30
MA28136A1 (fr) 2006-09-01
RU2344050C2 (ru) 2009-01-20
EP1673233A2 (fr) 2006-06-28
DE502004002992D1 (de) 2007-04-05
ATE354480T1 (de) 2007-03-15
WO2005035271A3 (fr) 2005-06-16
CN100415538C (zh) 2008-09-03
TNSN06102A1 (en) 2007-11-15
ES2278339T3 (es) 2007-08-01
CN1867459A (zh) 2006-11-22
WO2005035271A2 (fr) 2005-04-21
US7927511B2 (en) 2011-04-19
DE10346687A1 (de) 2005-05-04

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