EP3512713A1 - Document de valeur comportant un marquage de sécurité et procédé d'identification du marquage de sécurité - Google Patents

Document de valeur comportant un marquage de sécurité et procédé d'identification du marquage de sécurité

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Publication number
EP3512713A1
EP3512713A1 EP17767996.6A EP17767996A EP3512713A1 EP 3512713 A1 EP3512713 A1 EP 3512713A1 EP 17767996 A EP17767996 A EP 17767996A EP 3512713 A1 EP3512713 A1 EP 3512713A1
Authority
EP
European Patent Office
Prior art keywords
luminescent substances
ratio
luminescent
linear
time
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
EP17767996.6A
Other languages
German (de)
English (en)
Other versions
EP3512713B1 (fr
EP3512713B2 (fr
Inventor
Wolfgang Rauscher
Wolfgang Deckenbach
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 Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology 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
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Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Priority to PL17767996.6T priority Critical patent/PL3512713T5/pl
Publication of EP3512713A1 publication Critical patent/EP3512713A1/fr
Publication of EP3512713B1 publication Critical patent/EP3512713B1/fr
Application granted granted Critical
Publication of EP3512713B2 publication Critical patent/EP3512713B2/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
    • B42D25/20—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
    • B42D25/373—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
    • B42D25/30—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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties
    • 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
    • B42D25/21—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose for multiple purposes
    • 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
    • B42D25/24—Passports
    • 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
    • B42D25/355—Security threads
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D2207/00—Paper-money testing devices

Definitions

  • the present invention is in the technical field of production and verification of value documents and relates to a value document with a security marking and a method for identifying the same.
  • Value documents are usually protected by a special mark against unwanted and often illegal duplication. It has long been known to provide value documents for this purpose with luminescent substances which have a specific emission behavior. Thus, document WO 916009 A1 describes the authenticity verification of a value document via a determination of the luminescence decay time of a security marking. In this case, the security marker is pulsed excited and determines the time after the end of the excitation pulse, which elapses until a predefined luminescence intensity is reached.
  • the document US 7762468 B2 shows an authentication method in which a combination of two luminescent substances with different cooldowns is used. In this method, the second, slower decaying luminescent detected only when the luminescence of the first luminescent has already subsided.
  • the document DE 102006047851 A also discloses the evaluation of a security marking with luminescent substances with different decay behavior and overlapping emission spectra. In this method, the time course of the luminescence intensities is measured and the shape of the curve is checked for authentication or compared with nominal values.
  • Document US 9046486 B2 discloses a security tag and method for identifying it based on combinations of quasi-resonant luminescent materials having a different exponential decay behavior. By means of a non-linear adaptation, both the amplitudes and the decay times are determined. The method described is not suitable for markers with strongly non-exponential decay behavior, which limits the number of available markers. Also, the analysis by non-linear fitting proves to be time-consuming and error-prone to noise, so that the speed and quality of the evaluation is low.
  • the object of the present invention is to enable a reliable, secure and rapid identification of the identification of a value document with luminescent substances with complex time behavior.
  • the use of a variety of different luminescent substances with non-exponential time behavior should be possible.
  • a value document with a security marking is shown.
  • the term "value document” is to be understood as any articles to be protected against unwanted or unlawful duplication, for example banknotes, checks, shares, tokens, identity cards, credit cards and passports as well as labels, seals, packaging or other objects for the value assurance.
  • the security marking of the value document according to the invention can be assigned to at least one optionally definable (binary) property of the value document, the property being given upon identification (prediction of the security marking) and in the case of non-identification (absence the security mark) is not given.
  • the security marking can be assigned as authenticity mark or authenticity feature of the property "authenticity" in order to recognize value documents either as genuine or forged.
  • value documents are assigned by the security marking, for example, to a specific class or group, such as the note value or country of manufacture of banknotes.
  • the security marking is in the form of at least two luminescent substances (hereinafter also referred to as luminescent substances).
  • the luminescent substances can be incorporated in a variety of ways into the document of value or attached to the document of value.
  • the luminescent substances can be admixed with a paper or plastic mass for producing the value document or a printing ink for printing the value document. It is also conceivable to provide the luminescent substances as, for example, invisible coating on the document of value.
  • the luminescent substances can also be provided on or in a carrier material, for example consisting of plastic, which is embedded in a paper or plastic mass for producing the value document.
  • the carrier material may be formed, for example, in the form of a security or identification thread, a mottled fiber or planchette.
  • the carrier material can also be attached to the document of value, for example in the form of a badge, for example to carry out a product securing measure. Basically, any shape of the Susuna- is possible.
  • the at least two luminescent substances of the security marking can be excited jointly by a (same) excitation pulse (eg flash of light). It is essential here that the time profiles of the intensities of the emitted radiations of the luminescent substances excited by the excitation pulse are mutually different. where at least one luminescent substance has a non-mono-exponential time profile of the intensity of the emitted radiation.
  • the at least two luminescent substances are contained in a definable or defined quantitative ratio in combination (preferably in the form of a mixture). This means that each luminescent substance is present in a definable or defined relative proportion, based on the total amount of the luminescent substances, in the security marking.
  • the security mark can thus be unambiguously identified on the basis of the quantitative ratio (mixing ratio) of the luminescent substances.
  • each luminescent substance contributes with the intensity of its emitted luminescent radiation to the overall intensity of the simultaneously emitted radiations of the excited luminescent substances of the security marking.
  • total intensity here and below refers to a total intensity which is excited by a (same) excitation pulse and at a same time detected luminescence radiation of the luminescent substances contained in combination in the security marking.
  • the security marking is designed such that, for an identification of the security marking, the quantitative ratio (mixing ratio) of the luminescent substances is analyzed by an analysis of the time course of the total intensity of the emitted luminescence radiation (excited by an excitation pulse) on the basis of the time profiles of the intensities (excited at the same excitation pulse ) Lumineszenzstrahlitch the luminescent substances can be determined.
  • the use of at least one luminescent substance with a non- mono-exponential time profile of the intensity of the emitted radiation has the particular advantage that a large variety of substances suitable in principle is available and an improved protection against counterfeiting can be achieved by the specific selection.
  • the at least two luminescent substances are chosen so that the intensity of the emitted radiation of each luminescent substance in a range of 5% to 95%, preferably 10% to 90%, and particularly preferably 15% to 85%, of the total intensity of the luminescent substances lies.
  • the at least two luminescent substances are each selected such that the decay time, ie in particular the time between the end of the excitation pulse and the reaching of an intensity of 1 / e of the intensity at the end of the excitation pulse, in a range of 100 ns to 100 ms, preferably 10 ⁇ to 5 ms.
  • This is advantageous for a precise analysis of the time course of the total intensity of the emitted luminescence radiations of the luminescent substances on the basis of the time profiles of the intensities of the luminescence radiations emitted by the respective luminescent substances, which leads to a further improvement in the reliability of the identifiers. tification of the security feature.
  • the at least two luminescing substances have overlapping, in particular identical, excitation spectra, which enables a targeted and relatively strong excitation of the luminescent substances by a comparatively narrow-band excitation pulse (flash of light).
  • the at least two luminescent substances particularly preferably have overlapping emission spectra, as a result of which the security against forgery of the security feature is advantageously further improved on account of a significantly aggravated analysis of the emitted radiation.
  • the at least two luminescent substances are formed such that the time courses of the intensities of the emitted radiation over a Bray-Curtis distance of greater than 0.10, preferably greater than 0.20, and particularly preferably greater as 0.25.
  • the Bray-Curtis distance of two vectors (vi, .., v n ) and wi, .., w n ) is defined as
  • the accuracy of the analysis of the time lapse of the total intensity of the emitted luminescent radiations of the luminescent substances of the security mark can be increased on the basis of the timings of the intensities of the luminescent radiations emitted from the luminescent substances, which contributes to still further improving the reliability of the identification of the security feature.
  • the luminescent substances of the security marking of the value document according to the invention can in principle be chosen freely, as long as it is ensured that they can be excited together by an excitation pulse and the time courses of the emitted radiations of the luminescent Substances are different from each other, wherein at least one luminescing substance has a non-mono-exponential time course of the intensity of the emitted radiation.
  • the excitation and emission of the luminescent substances can take place in the UV, VIS and / or IR range.
  • luminescent substances can be used which are excited in the UV range and emit in the UV range or in the visible spectral range.
  • luminescent substances which are excited in the visible spectral range and emit in the visible spectral range or IR range. Furthermore, luminescent substances can be used which are excited in the IR range and emit in the IR range or emit in the visible range (up-converters).
  • luminescent substances which exhibit a particularly strong non-monoexponential decay behavior after the excitation are advantageous.
  • luminescent substances each comprising a host lattice, which are doped with at least one dopant selected from the rare earth metals and transition metals (or their ions).
  • suitable inorganic host lattices are oxides, borates, gallates, phosphates, garnets, perovskites, sulfides, oxysulfides, apatites, vanadates, tungamates, glasses, tantalates, niobates, halides, oxyhalides, in particular fluorides, silicates or aluminates.
  • host grids such as YAG, ZnS, YGG, YAM, YAP, AlPO 5 zeolites, Zn 2 SiO 4 , YVO 4 , CaSiO 3 , KMgF 3 , Y 2 O 2 S, La 2 O 2 S, Ba 2 P 2 O 7 , Gd 2 O 2 S, NaYW 2 O 6 , SrMoO 4 , MgF 2 , MgO, CaF 2 , YsGasOiz, KY (WO 4 ) 2 , SrAli 2 Oi 9 , ZBLAN, LiYF 4 , YPO, GdBO 3 , BaSi 2 O 5 or SrBeOy.
  • host grids such as YAG, ZnS, YGG, YAM, YAP, AlPO 5 zeolites, Zn 2 SiO 4 , YVO 4 , CaSiO 3 , KMgF 3 , Y 2 O 2 S, La
  • Suitable dopants are, for example, the rare earths La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, or Bi, Pb, Ni, Sn, Sb, W, Tl , Ag, Cu, Zn, Ti, Mn, Cr and V (or their ions).
  • Luminescent substances with a strongly non-mono-exponential time behavior of the intensity of the emitted radiation can be realized by different mechanisms.
  • energy transfer processes between different doping ions, in particular rare earth doping ions intrinsically multiple time constants occur in the onset as well as in the decay behavior.
  • Such energy transfer processes are, for example, for the dopant combinations Yb / Er, Nd / Yb, Yb / Tm, Cr / Tm, Tm / Ho, Er / Tm, Er / Ho, Yb / Ho, Cr / Ho, Fe / Tm, Mn / Tm , Cr / Er, Fe / Er, Cr / Nd, Cr / Nd, Cr / Yb, especially in combination with other dopant ions.
  • the use of such dopant combinations is preferred.
  • the exact time behavior of these substances depends sensitively both on the host lattice used (by finely splitting the position of the involved energy states) and on the respective doping ion concentrations. This is due to a relative change in coupling rates as compared to competing loss processes, e.g. a non-radiative recombination of the ions involved.
  • luminescent substances with complex intrinsic energy transfer processes can show intensity profiles with strongly non-mono-exponential time behavior, it being possible for the luminescence intensity to increase even further after the end of the excitation phase.
  • the combination of such substances Fe together with classical substances, which show a temporally monotone decreasing behavior after excitation allows a specific adjustment of the time behavior of the total intensity of the luminescent substances. In addition to sloping emission sections, this can also have ascents, plateaus, local maxima and / or minima.
  • the security marking has a combination of at least one luminescent substance with non-monoexponential time behavior and at least one luminescent substance with monoexponential time behavior of the intensity of the emitted luminescence radiation.
  • the security marking may comprise a combination of at least two luminescent substances each having a different, non-mono-exponential time behavior of the intensity of the emitted luminescence radiation.
  • luminescent substances in which several different transitions of a doping, which are energetically very similar but have different lifetimes, contribute to the emission in a narrow wavelength range. These luminescent substances also often show non-mono-exponential time behavior. Examples are Pr and Er.
  • luminescent substances can exhibit non-monopoly exponential behavior as a result of inhomogeneities which occur at random or are intentionally generated during production, for example an inhomogeneous particle size distribution or an inhomogeneous distribution of the dopants. This can occur, for example, when grains with faster time response, ie faster cooldown and / or faster onset time, and grains with slower time response, ie slower cooldown and / or slower onset time, arise.
  • Their different properties are averaged in the relevant, macroscopic measurement, in which relatively many individual grains are generally stimulated and measured simultaneously. This is superimposed the individual time structures of the emissions of the individual grains in such a way that overall a non-mono-exponential time behavior can result.
  • the skilled person can determine by simple measurement of the time-dependent luminescence of a luminescent substance, whether this has a mono-exponential time behavior or not.
  • the time course of the intensity in the decay phase is measured and an exponential curve is adapted to the decay curve.
  • the coefficient of determination R 2 can be used, the decay curve being rated, for example, as "non-exponential" if R 2 ⁇ 0.98.
  • the signal-to-noise ratio at the beginning of the decay curve should be at least 50, so that a fit with fit quality R 2 ⁇ 0.98 is not obtained by chance with a mono-exponential decay curve.
  • the invention further extends to a method for identifying (ie, detecting the presence or absence) of the security tag of a value document formed as described above. The method comprises the following steps: Step i)
  • Ii (t) are definable or defined time profiles of the intensities of the respective emitted by the luminescent substances (stimulated by the same excitation pulse) Lumineszenzstrahlungen and Ci to be adjusted linear coefficients.
  • the running index i refers to the luminescent substances
  • n indicates the number of luminescent substances and t the time.
  • the time profiles Ii (t) of the intensities of the luminescent substances can be determined for each luminescent substance by exciting with the same excitation pulse and detecting the luminescence radiation (in advance).
  • the linear coefficients Ci are determined.
  • the linear coefficients Ci each indicate the relative proportion of a time characteristic Ii (t) of a single luminescent substance to the linear combination I (t). From the linear coefficients Ci, the relative proportion of each luminescent substance relative to the total amount of the luminescent substances in the security mark and thus the amount ratio (e.g., mixing ratio) of the luminescent substances in the security mark can be determined.
  • the adaptation of the linear combination I (t), consisting of a weighted with the linear coefficients Ci sum of the known time courses L (t) to the total intensity I (t) of the simultaneously emitted luminescence enables advantageously a particularly simple, reliable and very fast determination the amount ratio (eg, mixing ratio) of the luminescent substances in the security mark, thereby enabling secure identification of the security mark.
  • the linear coefficients Ci are determined in step iii) such that absolute deviations of the linear combination I (t) from data points of the detected time profile of the total intensity are minimized.
  • the linear coefficients Ci are determined by the method of least squares so that the sum of the quadratic deviations of the linear combination I (t) of data points of the detected total intensity are minimized.
  • step iv) comprises the following substeps:
  • n-1 linear coefficients Ci determining a ratio Mi for each linear coefficient Ci, which results from the ratio of the linear coefficient a to at least one further linear coefficient Ci (eg ci / c 2 ).
  • the ratio Mi is determined by the ratio of the linear coefficient Ci to the sum of at least one, preferably all, linear coefficient Ci (eg c 1 / (ci + c 2 )).
  • the ratio Mi give the quantity ratio (eg mixing ratio) of the luminescent substances in the security marking.
  • Sub-steps iv-1) to iv-4) advantageously allow a simple and reliable identification of the security marking on the basis of the linear coefficient Ci.
  • this has a further step v), which comprises the following substeps:
  • the coefficient of determination R 2 is used as a measure G.
  • the expert in the field of statistical analysis of data sets the coefficient of determination R 2 is common, so that there is no need for further explanation here.
  • the coefficient of determination R 2 is a statistical standard method with which the quality of a linear approximation can be determined.
  • a measure G Compare the measure G with a definable or defined threshold. If the coefficient of determination R 2 is used as a measure G, then a lower threshold value of preferably 0.9, particularly preferably 0.95 is used, whereby a high degree of reliability in the identification of the security marking can be achieved.
  • step v Identifying the security marker if all of the ratios Mi have been scored with the Ratio Accepted attribute and the score G has been rated with the Accept Measure attribute, or if the at least one non-identifying (ie, detecting non-existence) security marker Ratio Mi has been evaluated with the attribute "ratio not accepted” and / or the measure G has been evaluated with the attribute "measure not accepted”.
  • a total intensity as a function of time ie Linear combination I (t)
  • the linear combination I (t) is a combination of the time courses of the intensities Ii (t) of the luminescent substances with the linear coefficients Ci of the luminescent substances.
  • the proportions of the luminescent substances are fixed.
  • the defined desired linear combination I (t) results in a defined quantitative ratio and defined proportions of the luminescent substances.
  • the respective time courses of the intensities Ii (t) of the luminescent substances and optionally the respective linear coefficients a are considered and / or evaluated.
  • a combination of the luminescent substances can be defined using a database in which the time profiles of the intensities Ii (t) are stored.
  • the relative proportion of the respective luminescent substance can be defined. In this case, it can be taken into account that for setting the intensity L (t) of the luminescent substance, it is provided with so-called camouflage substances.
  • the camouflage substances cause a reduction in the luminescence intensity of the luminescent substance, in particular by a time-constant factor, so that, depending on the amount of Tarnstoff from the linear coefficient a, a different relative proportion of the respective luminescent substance results.
  • FIG. 1 shows time courses of the luminescence intensities of two luminescent substances A, B with a different, non-mono-exponential emission behavior
  • FIG. 2 shows a time course of the total intensity of the luminescent ends
  • 3 shows time courses of the luminescence intensities of three luminescent substances A, B, C with a different, partly non-mono-exponential emission behavior
  • Fig. 4 shows a time course of the total intensity of the luminescent
  • Fig. 5 is a diagram illustrating a Gemischstupels
  • FIG. 6 top illustration: simulated time course of the luminescence intensity of a combination of luminescent substances with a defined noise component during the decay phase;
  • FIG. bottom figure Dependence of the relative mixing proportion on the size of the noise component;
  • FIG. 7 shows the time course of the total intensity of the emitted radiation of a mixture of two luminescent substances with a different, mono-exponential emission behavior for illustrating a counterfeiting experiment with an adaptation curve;
  • FIG. 8 shows a document of value with a security thread having a security mark.
  • Fig. 1 wherein by way of example the measured time courses of the intensities of the emitted luminescence radiations of two different luminescent substances A, B are illustrated.
  • the intensity I is plotted against time t (in arbitrary time and intensity units).
  • the measured data points are each connected to each other by a continuous data line.
  • the luminescence radiation of the two luminescent substances A, B are excited jointly by a single or the same excitation pulse (flash of light).
  • the duration and intensity of the excitation pulse are illustrated by the dashed lines.
  • the duration of the flash of light is in the range of 10 to 10 ms and is for example 40 ⁇ .
  • the time courses of the intensities of the two luminescent substances A, B each have an attack phase, in which the intensity increases from zero to a maximum value, and a decay phase, in which the intensity decreases from the maximum value to.
  • the luminescent substance B whose intensity only reaches a maximum value after switching off the excitation pulse. enough.
  • the time courses of the intensities of the two luminescent substances differ greatly from one another, with both luminescent substances showing a non-mono-exponential emission behavior.
  • the time courses of the intensities of the two luminescent substances have a Bray-Curtis distance of 0.25, which reflects a low and therefore preferred correlation behavior of the two emission progressions.
  • the luminescent substance A having a mixture fraction of 30% and the luminescent substance B having a mixing proportion of 70%, in each case based on the total amount of the luminescent substances A, B.
  • the (previously known) ratio (mixing ratio) of the luminescent substances A, B is thus 30% / 70%.
  • the measurements of the total intensity take place at defined times.
  • the measurements can take place at equidistant times, but also at non-equidistant times, the latter offering the advantage that, for example, with limited storage resources in the detection sensor, a reduced amount of data can be selected without significantly impairing the quality of the adaptation.
  • more measuring points are preferably taken in periods of time in which the intensity profiles of the base materials differ greatly, whereas fewer measuring points are taken during the decay phase long after the excitation, when the luminescence has already decayed far.
  • the measured time course of the total intensity I (t) is determined by fitting a linear combination of the general formula
  • the formula used for linear fitting (A) is a linear combination of (sampled) basis vectors L (t).
  • the run index i identifies the luminescent substances.
  • the basis vectors Ii (t) are definable or defined (previously known) time courses of the luminescent substances used and preferably result from previously determined temporal intensity measurements of the luminescent substances used.
  • the basis vectors L (t) are each weighted with the associated linear coefficients a ZU.
  • the basis vectors Ii (t) correspond to the previously known time profiles ⁇ ( ⁇ ), Iß (t) of the two luminescent substances A, B, as shown in FIG.
  • the determined linear coefficients Ci are combined as 2-tuples (ci, c 2 ) and converted into a scaling-independent value, a ratio Mi.
  • the value ranges Wi, W 2 each indicate a scattering range around the previously known mixing proportions of the luminescent substances A, B in the security marking. Then, for the tested ratio Mi or M 2, the attribute "Ratio accepted” is assigned, if the ratio is within the associated value range, or the attribute "Ratio not accepted", if the ratio is outside the associated value range.
  • the ratios Mi, M 2 are within the associated value ranges Wi, W 2 , ie within the scope of the scattering, the correct, ie known mixing proportions of the two luminescent substances A, B, in each case based on the total amount of the luminescent substances A, B. , or the known quantity ratio (mixing ratio) A / B determined.
  • the quality of the adaptation of the linear combination I (t) to the time course of the total intensity of the two luminescent substances A, B is determined.
  • the security marking is thus uniquely identified (ie, exists) since the ratio "Mi, M 2 " has been assigned the attribute "ratio accepted" and the quality of the adaptation lies above the desired threshold value. Due to the necessity of the presence of both conditions (attribute ratio, quality of the adaptation) a particularly high reliability can be achieved in the identification of the security marking.
  • a security mark is considered with three combined luminescent substances A, B, C, which are excited together by a same excitation pulse.
  • the luminescent substances A, B correspond to those of FIG. 1, the luminescent substance C is additionally added.
  • the time profiles of the intensities of the emitted luminescence radiations differ greatly from one another, the luminescent substance C, in contrast to the luminescent substances A, B, showing a mono-exponential emission behavior.
  • the measured data points are connected to each other by continuous data lines.
  • the mixing proportions of the luminescent substances A, B, C are, in this order, 20%, 50%, 30%, in each case based on the total amount of luminescent substances.
  • the mixing ratio A / B / C is thus 20% / 50% / 30%.
  • the combined intensity behavior was measured with a signal-to-noise ratio of about 20.
  • the measured data are shown in FIG. 4.
  • the abovementioned linear combination of the general formula A is adapted with three basis vectors ⁇ ( ⁇ ), I ⁇ (t), Ic (t), as shown in FIG. 3, the linear coefficients ci, c 2 c 3 determined by the least squares method.
  • the evaluation gives relative mixing proportions of the luminescent substances A, B, C, in this order, of 18.8%, 50.7%, 30.5%, in each case based on the total amount of luminescent substances.
  • an example of an elliptically shaped tolerance range is defined in an ab plane (see FIG. 5). This can be due to the shape of the temporal intensity behavior in different directions vary in extent.
  • the measured mixture tuple is represented by the filled circle, the set value (previously known mixture tuples) through the empty circle. Then, for two ratios Mi, M 2, an assignment of the attribute "Ratio accepted", if the ratio is within the associated value range, or the attribute "Ratio not accepted", if the ratio is outside the associated range of values.
  • the two ratios Mi, M 2 are within associated value ranges Wi, W 2 , wherein within the scope of the scattering, the correct, ie previously known, relative mixing proportions of the two luminescent substances A, B, in each case based on the total amount of the luminescent A, B, C were determined.
  • FIG. 6, top illustration In order to investigate the noise sensitivity of the method according to the invention, differently normal distributed noise components were added to the measurement points in the case of a decay curve of a mixture of two luminescent substances with monoexponential decay behavior. An evaluation was carried out using a linear adaptation method according to the present invention and a non-linear matching method known in the prior art. In Fig. 6, bottom figure, the evaluation is illustrated in a diagram in which the relative mixing ratio of a luminescent substance is plotted against the noise level.
  • FIG. 7 shows the time behavior of a monoexponentially decaying luminescent substance that could be used, for example, for counterfeiting.
  • FIG. 8 shows a value document 1 embodied, for example, in the form of a banknote, which has a security thread 2 with a security marking 3. The security marking 3 can be designed as described above.
  • the invention offers great advantages over the evaluation methods with non-linear adaptation known in the prior art, in which not only the amplitudes of the temporal intensity spectra but also the decay times are used as model parameters.
  • the method according to the invention with predetermined time behavior (in particular decay curves), a much faster and more stable evaluation (i.e.

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Credit Cards Or The Like (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

L'invention concerne un document de valeur comportant un marquage de sécurité sous forme d'au moins deux substances luminescentes présentes dans un rapport quantitatif défini et pouvant être excitées communément au moyen d'une impulsion d'excitation. Les profils temporels des intensités sont différents et au moins une substance luminescente présente un profil temporel non mono-exponentiel. Lors d'un procédé d'identification du marquage de sécurité, le profil temporel de l'intensité totale est détecté et une combinaison linéaire de la formule (I) est adaptée, Ii(t) étant des profils temporels des intensités des substances luminescentes. Le marquage de sécurité est identifié sur la base des coefficients linéaires Ci.
EP17767996.6A 2016-09-14 2017-09-14 Document de valeur comportant un marquage de sécurité et procédé d'identification du marquage de sécurité Active EP3512713B2 (fr)

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PL17767996.6T PL3512713T5 (pl) 2016-09-14 2017-09-14 Procedura identyfikacji oznaczenia bezpieczeństwa

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DE102016011180.1A DE102016011180A1 (de) 2016-09-14 2016-09-14 Wertdokument mit Sicherheitsmarkierung und Verfahren zur Identifikation der Sicherheitsmarkierung
PCT/EP2017/001087 WO2018050283A1 (fr) 2016-09-14 2017-09-14 Document de valeur comportant un marquage de sécurité et procédé d'identification du marquage de sécurité

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EP3512713A1 true EP3512713A1 (fr) 2019-07-24
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EP3512713B2 EP3512713B2 (fr) 2026-01-14

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EP (1) EP3512713B2 (fr)
KR (1) KR102265444B1 (fr)
CN (1) CN109863037B (fr)
DE (1) DE102016011180A1 (fr)
ES (1) ES2843602T5 (fr)
HU (1) HUE053301T2 (fr)
PL (1) PL3512713T5 (fr)
PT (1) PT3512713T (fr)
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EP3512713B2 (fr) † 2016-09-14 2026-01-14 Giesecke+Devrient Currency Technology GmbH Document de valeur comportant un marquage de sécurité et procédé d'identification du marquage de sécurité

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DE102018007289A1 (de) * 2018-09-14 2020-03-19 Giesecke+Devrient Currency Technology Gmbh Wertdokumentsystem
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DE102021107759B4 (de) 2020-12-22 2024-01-18 PicoQuant Innovations GmbH Verfahren zum Ermitteln von Lumineszenzlebensdauern einer lumineszenten Probe
CN113035480B (zh) * 2021-02-26 2022-02-11 中国科学院江西稀土研究院 一种磁制冷材料及其制备方法和应用

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DE102016011180A1 (de) 2018-03-15
ES2843602T5 (en) 2026-04-20
PT3512713T (pt) 2021-01-05
RU2712380C1 (ru) 2020-01-28
US10766294B2 (en) 2020-09-08
PL3512713T5 (pl) 2026-03-23
KR102265444B1 (ko) 2021-06-15
PL3512713T3 (pl) 2021-05-04
ES2843602T3 (es) 2021-07-19
WO2018050283A1 (fr) 2018-03-22
CN109863037B (zh) 2020-12-22
EP3512713B1 (fr) 2020-12-16
CN109863037A (zh) 2019-06-07
HUE053301T2 (hu) 2021-06-28
US20190358990A1 (en) 2019-11-28
EP3512713B2 (fr) 2026-01-14
KR20190039291A (ko) 2019-04-10

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