EP1863651B1 - Security element - Google Patents

Security element Download PDF

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Publication number
EP1863651B1
EP1863651B1 EP06704752A EP06704752A EP1863651B1 EP 1863651 B1 EP1863651 B1 EP 1863651B1 EP 06704752 A EP06704752 A EP 06704752A EP 06704752 A EP06704752 A EP 06704752A EP 1863651 B1 EP1863651 B1 EP 1863651B1
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EP
European Patent Office
Prior art keywords
luminescent substance
emission
luminescent
security element
frequency range
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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.)
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EP06704752A
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German (de)
French (fr)
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EP1863651A1 (en
Inventor
Markus Emerich
Harald Deinhammer
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.)
Oesterreichische Banknoten und Sicherheitsdruck GmbH
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Oesterreichische Banknoten und Sicherheitsdruck GmbH
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Priority to PL06704752T priority Critical patent/PL1863651T3/en
Priority to AT06704752T priority patent/ATE431786T1/en
Publication of EP1863651A1 publication Critical patent/EP1863651A1/en
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Publication of EP1863651B1 publication Critical patent/EP1863651B1/en
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    • 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
    • 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
    • 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
    • B42D2035/34—

Definitions

  • the invention relates to a security element for a security document, wherein the security document comprises a base body of a base material comprising a first luminescent substance.
  • the EP 1 346 839 A discloses a security element for a security document using a color comprising at least two fluorescent substances, the substances forming a cascade.
  • the object of the invention is to provide a security element of the type described above, in which the known disadvantages are avoided, which can be easily checked and which has a high security against counterfeiting.
  • this is achieved in that a second luminescent substance is provided, that an energy transmission is provided between the first luminescent substance and the second luminescent substance, wherein the frequency range of the excitation of one of the luminescent substances corresponds to the frequency range of the emission of the other of the luminescent substances, and that the first luminescent substance is thermally unstable at the ignition temperature of the base material and / or at a temperature of 185 ° C.
  • the emission of one of the luminescent substances stimulates the other of the luminescent substances, the presence of both substances can be checked in a simple manner in one step.
  • the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance can be determined and used as a criterion for the authenticity.
  • the security element can not be fully extracted after burning the bill.
  • the second luminescent substance is thermally stable, the presumption of authenticity can be confirmed by the detection of this substance in a burnt security document.
  • the first luminescent substance may be formed to be resistant to acids, whereby the first luminescent substance can not be extracted even in a chemical decomposition of the base material.
  • the frequency range of the emission is higher than the frequency range of the excitation
  • the frequency range of the excitation of the second luminescent substance corresponds to the frequency range of the emission of the first luminescent substance, wherein the first luminescent substance excites the second luminescent substance.
  • the first luminescent substance is an up-converter, the energy of its emission is usually considerably lower than the excitation.
  • the excitation of the up-converter by means of an external light source can easily ensure that there is sufficient energy to excite the second luminescent substance.
  • the frequency range of the emission of the first luminescent substance is in the visible range, whereby the presence of the first luminescent substance can be easily detected with the naked eye, provided that a suitable light source is used for excitation.
  • a suitable light source can be, for example, IR laser diodes, which can be provided simply and inexpensively, for example as a key fob.
  • the frequency range of the emission is lower than the frequency range of the excitation.
  • Such conventional down-converters have a good quantum efficiency, whereby a sufficient emission of the second luminescent substance can be ensured even when using an up-converter.
  • the first luminescent substance and the second luminescent substance are present in a predeterminable ratio, whereby the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance is used as a further criterion for the authenticity.
  • a first region comprises the first luminescent substance and the second luminescent substance, and that a second region comprises only the first luminescent substance.
  • the regional presence of the substances can be easily determined and used as a safety criterion.
  • a third region comprises only the second luminescent substance, whereby the imitation of the security element is further complicated with a simple Matterberprüfhus.
  • the invention further relates to a security document with a security element described above.
  • the security document has the advantages described for the security element.
  • the invention further relates to a method for checking the authenticity and / or quality of a security document with a security element mentioned above.
  • the object of the invention is to provide a method of the type described above, in which the known disadvantages are avoided, with a simple and quick review can be performed and high security against counterfeiting can be ensured. This is achieved by the features of claim 10 according to the invention.
  • a printing ink for a security element described above, wherein the security element is applicable to a security document having a base body of a base material comprising a first luminescent substance may be formed by providing a second luminescent substance that is interposed between the first luminescent substance and the first luminescent substance second luminescent substance is an energy transfer, wherein the frequency range of the excitation of one of the luminescent substances corresponds to the frequency range of the emission of the other of the luminescent substances, and that the first luminescent substance at the ignition temperature of the base material and / or at a temperature of 185 ° C thermally is unstable, whereby the security element in a printing operation is easy to produce.
  • Fig. 1 is a plan view of a security document 5 with a security element 1 shown.
  • the security document 5 comprises a base 51 made of a base material.
  • the security document 5 can be, for example, a banknote, a chip card, a document or the like, wherein the base material may in particular be paper, cardboard, plastic, cotton. In other embodiments, the base material may also be a composite material.
  • the security element 1 comprises a first luminescent substance and a second luminescent substance, wherein an energy transfer is provided between the first luminescent substance and the second luminescent substance, wherein the frequency range of the excitation of one of the luminescent substances the frequency range of the emission of the other of the corresponds to luminescent substances.
  • one of the luminescent substances is excited by the emission of the other of the luminescent substances.
  • both luminescent substances can be excited.
  • the security element 1 can be designed so that the second luminescent substance is excited by the emission of the first luminescent substance, or also that the first luminescent substance is excited by the emission of the second luminescent substance.
  • the luminescent substances can be excited in a frequency range which is around a frequency with maximum energy yield.
  • the frequency range corresponds to the technically meaningful range in which the energy yield corresponds to a specifiable percentage of the maximum energy yield, which can preferably be greater than 10%, in particular greater than 20%.
  • the correspondence of the frequency ranges is given when there is an overlap of the frequency ranges, wherein preferably both frequencies lie with the maximum energy yield in the overlap region. It appears particularly favorable if the distance of the two frequencies with the maximum energy yield is less than 25%, preferably less than 10%, in particular less than 5%, of the total width of the overlap region.
  • the first luminescent substance is thermally unstable at the ignition temperature of the base material and / or at a temperature of 185 ° C.
  • Thermally unstable in the sense of the invention means that a chemical or physical conversion of the luminescent substance takes place, so that the luminescent properties are lost, or at least change so much that the change can be checked by a detector and the security document 5 can be eliminated.
  • the ignition temperature is the lowest temperature at which the base material is made to burn. For a security document 5 with a paper base material, the ignition temperature is usually between 185 ° C and 360 ° C.
  • Luminescent substances can be of organic or inorganic material, wherein organic materials are often thermally unstable but have the disadvantage that they are also non-lightfast and unsuitable for security documents exposed to light, for example banknotes, without appropriate protective measures. In contrast, most inorganic materials are thermally stable and can be extracted after combustion of the security document.
  • the frequency range of the emission may be higher than the frequency range of the excitation, which in this case is an up-converter. If an up-converter is provided for the first luminescent substance, a thermally unstable and light-fast material can be provided in a simple manner.
  • the up-converter can be excited by means of an external light source with a high intensity, whereby a sufficient emission is achieved in order to ensure a readily measurable emission of the second luminescent substance.
  • the frequency range of the emission of the first luminescent substance is in the visible range, then the emission can be easily detected with the naked eye.
  • the excitation can be done by means of an IR laser diode, which can be provided easily and inexpensively. As a result, the general public can be provided with a means of checking the authenticity of a security document 5 simply and quickly.
  • Down converters usually have a higher quantum efficiency than up-converters, which is why it seems favorable if, in the case of the second luminescent substance, the frequency range of the emission is lower than the frequency range of the excitation.
  • An additional security feature is formed when the first luminescent substance and the second luminescent substance are present in a predeterminable ratio.
  • the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance can be determined, the ratio being determined by the corresponding quantities of the luminescent substances.
  • the security element 1 can be designed in such a way that a first region 11 comprises the first luminescent substance and the second luminescent substance, a second region 12 only the first luminescent substance and a third region 13 only the second luminescent substance.
  • a security element 1 is in Fig. 1 shown.
  • Fig. 2 is the emission of the first luminescent substance is shown in their excitation. It can be seen that the concentration of the first luminescent substance is not constant and is increasing in the representation from left to right.
  • Fig. 3 the emission of the second luminescent substance is shown when excited. It can be seen that the concentration of the second luminescent substance in the illustration is decreasing from left to right.
  • Fig. 1 shown.
  • Fig. 2 is the emission of the first luminescent substance is shown in their excitation. It can be seen that the concentration of the first luminescent substance is not constant and is increasing in the representation from left to right.
  • Fig. 3 the emission of the second luminescent substance is shown when excited. It can be seen that the
  • a different concentration of the first luminescent substance and / or the second luminescent substance can be achieved, for example, by means of different line widths and / or line spacings in the first region 11, the second region 12 and / or the third region 13. It can also be the formation of barcodes by a corresponding arrangement of the areas 11, 12, 13 can be achieved.
  • first region 11, the first region 11 and the second region 12 or the first region 11 and the third region 13 may be provided.
  • the first luminescent substance can be excited by means of a light source and the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance can be determined. By taking this ratio into account, the security against counterfeiting can be further improved.
  • the security element 1 can be easily manufactured in a printing step when using a printing ink comprising the first luminescent substance and the second luminescent substance.
  • the first luminescent substance and the second luminescent substance occur only in low concentrations in the security element, as this makes it difficult for a counterfeiter to find these substances.
  • an up-converter can be provided by the provision of the up-converter as an externally excited substance of the security element 1 even with a low concentration of Luminescent substances a sufficient quality of the security element 1 can be achieved, which ensures reliable detection. Due to the low concentrations, the security element 1 can be realized by printing technology simply and inexpensively. Furthermore, the choice of a low concentration makes it difficult to find the security feature by a counterfeiter.
  • the security element 1 can also be designed as an adhesive film, as a component of a hologram, as a strip element or the like.
  • the security element 1 can also comprise further security features, for example a further luminescent substance.

Abstract

The invention relates to a security element (1), comprising a first luminescent substance, for a security document (5), the latter (5) comprising a base body (51) consisting of a base material. The aim of the invention is to increase the protection against forgery. To achieve this: the security element is provided with a second luminescent substance; energy is transmitted between the first luminescent substance and the second luminescent substance, whereby the frequency range of the excitation of one of the luminescent substances corresponds to the emission frequency range of the other luminescent substance; and the first luminescent substance is thermally unstable at the ignition temperature of the base material and/or at a temperature of 185° C.

Description

Die Erfindung betrifft ein Sicherheitselement für ein Sicherheitsdokument, wobei das Sicherheitsdokument einen Grundkörper aus einem Grundmaterial umfasst, umfassend eine erste lumineszierende Substanz.The invention relates to a security element for a security document, wherein the security document comprises a base body of a base material comprising a first luminescent substance.

Es ist bekannt, bei Bannknoten Sicherheitselemente mit lumineszierenden Substanzen vorzusehen, die im Grundkörper eingebettet oder in einer Farbe enthalten sein können. Diese Substanzen können einfach angeregt werden und das emittierte Licht detektiert werden, wodurch eine Echtheitsprüfung einfach durchgeführt werden kann. Nachteilig dabei ist, dass viele dieser lumineszierenden Substanzen durch Verbrennen der Banknote extrahiert und auf Fälschungen mit einem höheren Wert aufgebracht werden können.It is known to provide safety elements with luminescent substances at anchor points, which may be embedded in the main body or contained in one color. These substances can easily be excited and the emitted light can be detected, whereby a fastness test can be easily performed. The disadvantage here is that many of these luminescent substances can be extracted by burning the banknote and applied to counterfeits with a higher value.

Die EP 1 346 839 A offenbart ein Sicherheitselement für ein Sicherheitsdokument, wobei eine Farbe verwendet wird, die wenigstens zwei fluoreszierende Substanzen umfasst, wobei die Substanzen eine Kaskade ausbilden.The EP 1 346 839 A discloses a security element for a security document using a color comprising at least two fluorescent substances, the substances forming a cascade.

Aus der WO 01/06453 A ist ein Verfahren zur Überprüfung eines Sicherheitselementes bekannt, bei dem das Verhältnis der Emissionen zweier lumineszierenden Substanzen bestimmt wird.From the WO 01/06453 A a method for checking a security element is known in which the ratio of the emissions of two luminescent substances is determined.

Aufgabe der Erfindung ist es, ein Sicherheitselement der eingangs beschriebenen Art anzugeben, bei dem die bekannten Nachteile vermieden sind, das einfach überprüft werden kann und die eine hohe Fälschungssicherheit aufweist.The object of the invention is to provide a security element of the type described above, in which the known disadvantages are avoided, which can be easily checked and which has a high security against counterfeiting.

Erfindungsgemäß wird dies dadurch erreicht, dass eine zweite lumineszierende Substanz vorgesehen ist, dass zwischen der ersten lumineszierenden Substanz und der zweiten lumineszierenden Substanz eine Energieübertragung vorgesehen ist, wobei der Frequenzbereich der Anregung einer der lumineszierenden Substanzen dem Frequenzbereich der Emission der anderen der lumineszierenden Substanzen entspricht, und dass die erste lumineszierende Substanz bei der Zündtemperatur des Grundmaterials und/oder bei einer Temperatur von 185°C thermisch instabil ist.According to the invention, this is achieved in that a second luminescent substance is provided, that an energy transmission is provided between the first luminescent substance and the second luminescent substance, wherein the frequency range of the excitation of one of the luminescent substances corresponds to the frequency range of the emission of the other of the luminescent substances, and that the first luminescent substance is thermally unstable at the ignition temperature of the base material and / or at a temperature of 185 ° C.

Wird durch die Emission einer der lumineszierenden Substanzen die andere der lumineszierenden Substanzen anregt, so kann das Vorhandensein beider Substanzen auf einfache Weise in einem Schritt überprüft werden. Dabei kann insbesondere auch das Verhältnis der Emission der ersten lumineszierenden Substanz zu der Emission der zweiten lumineszierenden Substanz bestimmt werden und als Kriterium für die Echtheit herangezogen werden. Durch die Verwendung zumindest einer lumineszierenden Substanz, welche bei der Zündtemperatur des Grundmaterials und/oder bei einer Temperatur von 185°C thermisch instabil ist, kann das Sicherheitselement nicht nach Verbrennen der Banknote gänzlich extrahiert werden. Ist die zweite lumineszierende Substanz thermisch stabil, so kann durch den Nachweis dieser Substanz in einem verbrannten Sicherheitsdokument die Echtheitsvermutung bestärkt werden. Weiters kann die erste lumineszierende Substanz gegen Säuren unbeständig ausgebildet sein, wodurch die erste lumineszierende Substanz auch bei einer chemischen Zersetzung des Grundmaterials nicht extrahiert werden kann.If the emission of one of the luminescent substances stimulates the other of the luminescent substances, the presence of both substances can be checked in a simple manner in one step. In this case, in particular, the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance can be determined and used as a criterion for the authenticity. By the use of at least one luminescent substance, which in the Ignition temperature of the base material and / or thermally unstable at a temperature of 185 ° C, the security element can not be fully extracted after burning the bill. If the second luminescent substance is thermally stable, the presumption of authenticity can be confirmed by the detection of this substance in a burnt security document. Furthermore, the first luminescent substance may be formed to be resistant to acids, whereby the first luminescent substance can not be extracted even in a chemical decomposition of the base material.

In Weiterführung der Erfindung kann vorgesehen sein, dass bei der ersten lumineszierenden Substanz der Frequenzbereich der Emission höher als der Frequenzbereich der Anregung ist, Durch Verwendung eines Up-Converters kann auf einfache Weise eine lichtechte und thermisch instabile lumineszierende Substanz bereitgestellt werden, welche vorzugsweise anorganisch ist.In a further development of the invention it can be provided that in the first luminescent substance, the frequency range of the emission is higher than the frequency range of the excitation, By using an up-converter, a lightfast and thermally unstable luminescent substance can be provided in a simple manner, which is preferably inorganic ,

Gemäß einer weiteren Ausbildung der Erfindung kann vorgesehen sein, dass der Frequenzbereich der Anregung der zweiten lumineszierenden Substanz dem Frequenzbereich der Emission der ersten lumineszierenden Substanz entspricht, wobei die erste lumineszierende Substanz die zweite lumineszierende Substanz anregt. Ist die erste lumineszierende Substanz ein Up-Converter, so ist die Energie dessen Emission üblicherweise erheblich geringer als die Anregung. Durch die Anregung des Up-Converters mittels einer externen Lichtquelle kann einfach sichergestellt werden, dass eine hinreichende Energie zur Anregung der zweiten lumineszierenden Substanz vorhanden ist.According to a further embodiment of the invention, it may be provided that the frequency range of the excitation of the second luminescent substance corresponds to the frequency range of the emission of the first luminescent substance, wherein the first luminescent substance excites the second luminescent substance. If the first luminescent substance is an up-converter, the energy of its emission is usually considerably lower than the excitation. The excitation of the up-converter by means of an external light source can easily ensure that there is sufficient energy to excite the second luminescent substance.

In weiterer Ausgestaltung der Erfindung kann vorgesehen sein, dass der Frequenzbereich der Emission der ersten lumineszierenden Substanz im sichtbaren Bereich liegt, wodurch das Vorhandensein der ersten lumineszierenden Substanz einfach mit bloßem Auge detektiert werden kann, sofern eine geeignete Lichtquelle zur Anregung verwendet wird. Derartige Lichtquellen können beispielsweise IR-Laserdioden sein, die einfach und kostengünstig bereitgestellt werden können, beispielsweise als Schlüsselanhänger.In a further embodiment of the invention it can be provided that the frequency range of the emission of the first luminescent substance is in the visible range, whereby the presence of the first luminescent substance can be easily detected with the naked eye, provided that a suitable light source is used for excitation. Such light sources can be, for example, IR laser diodes, which can be provided simply and inexpensively, for example as a key fob.

Gemäß einer weiteren Ausführungsform der Erfindung kann vorgesehen sein, dass bei der zweiten lumineszierenden Substanz der Frequenzbereich der Emission niedriger als der Frequenzbereich der Anregung ist. Derartige herkömmliche Down-Converter weisen eine gute Quantenausbeute auf, wodurch eine hinreichende Emission der zweiten lumineszierenden Substanz auch bei Verwendung eines Up-Converters sichergestellt werden kann.According to a further embodiment of the invention, it may be provided that in the second luminescent substance the frequency range of the emission is lower than the frequency range of the excitation. Such conventional down-converters have a good quantum efficiency, whereby a sufficient emission of the second luminescent substance can be ensured even when using an up-converter.

In Weiterbildung der Erfindung kann vorgesehen sein, dass die erste lumineszierende Substanz und die zweite lumineszierende Substanz in einem vorgebbaren Verhältnis vorhanden sind, wodurch das Verhältnis der Emission der ersten lumineszierenden Substanz zu der Emission der zweiten lumineszierenden Substanz als weiteres Kriterium für die Echtheit herangezogen wird.In a further development of the invention it can be provided that the first luminescent substance and the second luminescent substance are present in a predeterminable ratio, whereby the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance is used as a further criterion for the authenticity.

Gemäß einer anderen Ausgestaltung der Erfindung kann vorgesehen sein, dass ein erster Bereich die erste lumineszierende Substanz und die zweite lumineszierende Substanz umfasst, und dass ein zweiter Bereich lediglich die erste lumineszierende Substanz umfasst. Dabei kann das bereichsweise Vorhandensein der Substanzen einfach festgestellt und als Sicherheitskriterium verwendet werden.According to another embodiment of the invention it can be provided that a first region comprises the first luminescent substance and the second luminescent substance, and that a second region comprises only the first luminescent substance. In this case, the regional presence of the substances can be easily determined and used as a safety criterion.

In diesem Zusammenhang kann in Weiterführung der Erfindung vorgesehen sein, dass ein dritter Bereich lediglich die zweite lumineszierende Substanz umfasst, wodurch die Nachahmung des Sicherheitselementes bei einer einfachen Ürberprüfbarkeit weiter erschwert wird.In this context, it can be provided in a continuation of the invention that a third region comprises only the second luminescent substance, whereby the imitation of the security element is further complicated with a simple Überberprüfbarkeit.

Die Erfindung betrifft weiters ein Sicherheitsdokument mit einem oben beschriebenen Sicherheitselement.The invention further relates to a security document with a security element described above.

Dabei weist das Sicherheitsdokument die für das Sicherheitselement beschriebenen Vorteile auf.In this case, the security document has the advantages described for the security element.

Die Erfindung betrifft weiters ein Verfahren zur Überprüfung der Echtheit und/oder Güte eines Sicherheitsdokumentes mit einem eingangs genannten Sicherheitselement.The invention further relates to a method for checking the authenticity and / or quality of a security document with a security element mentioned above.

Es ist bekannt, Sicherheitselemente bei Bannknoten, die lumineszierende Substanzen enthalten, anzuregen und das emittierte Licht zu detektieren. Nachteilig dabei ist, dass diese lumineszierenden Substanzen nach Verbrennen der Banknote extrahiert und auf Fälschungen mit einem höheren Wert aufgebracht werden können, wobei die bekannten Verfahren solche Banknoten als echt detektieren.It is known to excite security elements at spanning nodes containing luminescent substances and to detect the emitted light. The disadvantage here is that these luminescent substances can be extracted after burning the banknote and applied to counterfeits having a higher value, the known methods detecting such banknotes as genuine.

Aufgabe der Erfindung ist es, ein Verfahren der oben beschriebenen Art anzugeben, bei der die bekannten Nachteile vermieden sind, mit dem eine einfache und schnelle Überprüfung durchgeführt werden kann und eine hohe Fälschungssicherheit sichergestellt werden kann. Erfindungsgemäß wird dies durch die Merkmale des Anspruches 10 erreicht.The object of the invention is to provide a method of the type described above, in which the known disadvantages are avoided, with a simple and quick review can be performed and high security against counterfeiting can be ensured. This is achieved by the features of claim 10 according to the invention.

Dadurch ergibt sich der Vorteil, dass bei der Emission einer der lumineszierenden Substanzen die andere der lumineszierenden Substanzen angeregt wird, wobei das Vorhandensein beider Substanzen auf einfache Weise zusammen überprüft werden kann. Durch die Bestimmung des Verhältnisses der Emission der ersten lumineszierenden Substanz zu der Emission der zweiten lumineszierenden Substanz wird ein zusätzliches Kriterium für die Echtheit bereitgestellt. Eine Druckfarbe für ein oben beschriebenes Sicherheitselement, wobei das Sicherheitselement auf einem Sicherheitsdokument mit einem Grundkörper aus einem Grundmaterial aufbringbar ist, umfassend eine erste lumineszierende Substanz, kann dadurch ausgebildet sein, dass eine zweite lumineszierende Substanz vorgesehen ist, dass zwischen der ersten lumineszierenden Substanz und der zweiten lumineszierenden Substanz eine Energieübertragung vorgesehen ist, wobei der Frequenzbereich der Anregung einer der lumineszierenden Substanzen dem Frequenzbereich der Emission der anderen der lumineszierenden Substanzen entspricht, und dass die erste lumineszierende Substanz bei der Zündtemperatur des Grundmaterials und/oder bei einer Temperatur von 185°C thermisch instabil ist, wodurch das das Sicherheitselement in einem Druckvorgang einfach herstellbar ist.This results in the advantage that in the emission of one of the luminescent substances, the other of the luminescent substances is excited, wherein the presence of both substances can be checked together in a simple manner. By determining the Ratio of the emission of the first luminescent substance to the emission of the second luminescent substance provides an additional criterion for the authenticity. A printing ink for a security element described above, wherein the security element is applicable to a security document having a base body of a base material comprising a first luminescent substance, may be formed by providing a second luminescent substance that is interposed between the first luminescent substance and the first luminescent substance second luminescent substance is an energy transfer, wherein the frequency range of the excitation of one of the luminescent substances corresponds to the frequency range of the emission of the other of the luminescent substances, and that the first luminescent substance at the ignition temperature of the base material and / or at a temperature of 185 ° C thermally is unstable, whereby the security element in a printing operation is easy to produce.

Die Erfindung wird unter Bezugnahme auf die beigeschlossenen Zeichnungen, in welchen eine Ausführungsform dargestellt ist, näher beschrieben. Dabei zeigt:

  • Fig. 1 eine Draufsicht auf ein erfindungsgemäßes Sicherheitsdokument;
  • Fig. 2 die Emission der ersten lumineszierenden Substanz bei Anregung derselben;
  • Fig. 3 die Emission der zweiten lumineszierenden Substanz bei Anregung derselben; und
  • Fig. 4 die Emission der zweiten lumineszierenden Substanz bei Anregung der ersten lumineszierenden Substanz.
The invention will be described in more detail with reference to the accompanying drawings, in which an embodiment is shown. Showing:
  • Fig. 1 a plan view of a security document according to the invention;
  • Fig. 2 the emission of the first luminescent substance upon excitation thereof;
  • Fig. 3 the emission of the second luminescent substance upon excitation thereof; and
  • Fig. 4 the emission of the second luminescent substance upon excitation of the first luminescent substance.

In Fig. 1 ist eine Draufsicht auf ein Sicherheitsdokument 5 mit einem Sicherheitselement 1 dargestellt. Das Sicherheitsdokument 5 umfasst einen Grundkörper 51 aus einem Grundmaterial. Das Sicherheitsdokument 5 kann beispielsweise eine Banknote, eine Chipkarte, eine Urkunde od. dgl. sein, wobei das Grundmaterial insbesondere Papier, Karton, Kunststoff, Baumwolle sein kann. Bei anderen Ausführungsformen kann das Grundmaterial auch ein Verbundwerkstoff sein. Das Sicherheitselement 1 weist eine erste lumineszierende Substanz und eine zweite lumineszierende Substanz auf, wobei zwischen der ersten lumineszierenden Substanz und der zweiten lumineszierenden Substanz eine Energieübertragung vorgesehen ist, wobei der Frequenzbereich der Anregung einer der lumineszierenden Substanzen dem Frequenzbereich der Emission der anderen der lumineszierenden Substanzen entspricht. Dabei wird eine der lumineszierenden Substanzen durch die Emission der anderen der lumineszierenden Substanzen angeregt. Somit können durch die Anregung lediglich einer der lumineszierenden Substanzen mittels einer externen Lichtquelle beide lumineszierende Substanzen angeregt werden. Das Sicherheitselement 1 kann so ausgebildet sein, dass die zweite lumineszierende Substanz durch die Emission der ersten lumineszierenden Substanz angeregt ist, oder aber auch, dass die erste lumineszierende Substanz durch die Emission der zweiten lumineszierenden Substanz angeregt wird.In Fig. 1 is a plan view of a security document 5 with a security element 1 shown. The security document 5 comprises a base 51 made of a base material. The security document 5 can be, for example, a banknote, a chip card, a document or the like, wherein the base material may in particular be paper, cardboard, plastic, cotton. In other embodiments, the base material may also be a composite material. The security element 1 comprises a first luminescent substance and a second luminescent substance, wherein an energy transfer is provided between the first luminescent substance and the second luminescent substance, wherein the frequency range of the excitation of one of the luminescent substances the frequency range of the emission of the other of the corresponds to luminescent substances. In this case, one of the luminescent substances is excited by the emission of the other of the luminescent substances. Thus, by excitation of only one of the luminescent substances by means of an external light source, both luminescent substances can be excited. The security element 1 can be designed so that the second luminescent substance is excited by the emission of the first luminescent substance, or also that the first luminescent substance is excited by the emission of the second luminescent substance.

Die lumineszierenden Substanzen können in einem Frequenzbereich angeregt werden, der um eine Frequenz mit maximaler Energieausbeute liegt. Im Sinne der Erfindung entspricht der Frequenzbereich dem technisch sinnvollen Bereich, bei dem die Energieausbeute einem vorgebbaren Prozentsatz der maximalen Energieausbeute entspricht, welcher vorzugsweise größer als 10%, insbesondere größer als 20%, vorgegeben werden kann. Analoges gilt auch für den Frequenzbereich der Emission. Die Entsprechung der Frequenzbereiche ist dann gegeben, wenn eine Überlappung der Frequenzbereiche gegeben ist, wobei vorzugsweise beide Frequenzen mit der maximalen Energieausbeute in dem Überlappungsbereich liegen. Besonders günstig erscheint es, wenn der Abstand der beiden Frequenzen mit der maximalen Energieausbeute weniger als 25%, vorzugsweise weniger als 10%, insbesondere weniger als 5%, der Gesamtbreite des Überlappungsbereiches beträgt.The luminescent substances can be excited in a frequency range which is around a frequency with maximum energy yield. For the purposes of the invention, the frequency range corresponds to the technically meaningful range in which the energy yield corresponds to a specifiable percentage of the maximum energy yield, which can preferably be greater than 10%, in particular greater than 20%. The same applies to the frequency range of the emission. The correspondence of the frequency ranges is given when there is an overlap of the frequency ranges, wherein preferably both frequencies lie with the maximum energy yield in the overlap region. It appears particularly favorable if the distance of the two frequencies with the maximum energy yield is less than 25%, preferably less than 10%, in particular less than 5%, of the total width of the overlap region.

Die erste lumineszierende Substanz ist bei der Zündtemperatur des Grundmaterials und/oder bei einer Temperatur von 185°C thermisch instabil. Thermisch instabil im Sinne der Erfindung bedeutet, dass eine chemische oder physikalische Umwandlung der lumineszierenden Substanz stattfindet, sodass die lumineszierenden Eigenschaften verloren gehen, oder sich zumindest so stark ändern, dass die Veränderung von einem Detektor geprüft und das Sicherheitsdokument 5 ausgeschieden werden kann. Die Zündtemperatur ist die niedrigste Temperatur, bei der das Grundmaterial zum Brennen angeregt wird. Für ein Sicherheitsdokument 5 mit einem Grundmaterial aus Papier liegt die Zündtemperatur üblicherweise zwischen 185°C und 360°C.The first luminescent substance is thermally unstable at the ignition temperature of the base material and / or at a temperature of 185 ° C. Thermally unstable in the sense of the invention means that a chemical or physical conversion of the luminescent substance takes place, so that the luminescent properties are lost, or at least change so much that the change can be checked by a detector and the security document 5 can be eliminated. The ignition temperature is the lowest temperature at which the base material is made to burn. For a security document 5 with a paper base material, the ignition temperature is usually between 185 ° C and 360 ° C.

Lumineszierende Substanzen können aus organischem oder aus anorganischem Material sein, wobei organische Materialien oftmals thermisch instabil sind, jedoch den Nachteil aufweisen, dass sie auch nicht lichtecht sind und für Sicherheitsdokumente, die Licht ausgesetzt sind, beispielsweise Banknoten, ohne entsprechende Schutzmaßnahmen ungeeignet sind. Demgegenüber sind die meisten anorganischen Materialien thermisch stabil und können nach einer Verbrennung des Sicherheitsdokumentes extrahiert werden.Luminescent substances can be of organic or inorganic material, wherein organic materials are often thermally unstable but have the disadvantage that they are also non-lightfast and unsuitable for security documents exposed to light, for example banknotes, without appropriate protective measures. In contrast, most inorganic materials are thermally stable and can be extracted after combustion of the security document.

Bei der ersten lumineszierenden Substanz kann der Frequenzbereich der Emission höher als der Frequenzbereich der Anregung sein, wobei es sich in diesem Fall um einen Up-Converter handelt. Wird für die erste lumineszierende Substanz ein Up-Converter vorgesehen, so kann auf einfache Weise ein thermisch instabiles und lichtechtes Material bereitgestellt werden.In the first luminescent substance, the frequency range of the emission may be higher than the frequency range of the excitation, which in this case is an up-converter. If an up-converter is provided for the first luminescent substance, a thermally unstable and light-fast material can be provided in a simple manner.

Bekannte Up-Converter weisen eine geringe Quantenausbeute auf, weshalb eine starke Anregung erforderlich ist, um eine entsprechen Intensität der Emission zu bewirken. Es erscheint günstig, wenn das Sicherheitselement 1 so ausgebildet ist, dass der Frequenzbereich der Anregung der zweiten lumineszierenden Substanz dem Frequenzbereich der Emission der ersten lumineszierenden Substanz entspricht. Dabei kann der Up-Converter mittels einer externen Lichtquelle mit einer hohen Intensität angeregt werden, wodurch eine hinreichende Emission erreicht wird, um eine gut messbare Emission der zweiten lumineszierenden Substanz sicherzustellen.Known Up converters have a low quantum efficiency, which is why a strong excitation is required to cause a corresponding intensity of the emission. It seems favorable if the security element 1 is embodied such that the frequency range of the excitation of the second luminescent substance corresponds to the frequency range of the emission of the first luminescent substance. In this case, the up-converter can be excited by means of an external light source with a high intensity, whereby a sufficient emission is achieved in order to ensure a readily measurable emission of the second luminescent substance.

Liegt der Frequenzbereich der Emission der ersten lumineszierenden Substanz im sichtbaren Bereich, so kann die Emission einfach mit freiem Auge detektiert werden. Im Falle eines Up-Converters kann die Anregung mittels einer IR-Laserdiode erfolgen, die einfach und kostengünstig bereitgestellt werden kann. Dadurch kann der breiten Bevölkerung ein Mittel in die Hand gegeben werden, einfach und schnell die Echtheit eines Sicherheitsdokumentes 5 zu überprüfen.If the frequency range of the emission of the first luminescent substance is in the visible range, then the emission can be easily detected with the naked eye. In the case of an up-converter, the excitation can be done by means of an IR laser diode, which can be provided easily and inexpensively. As a result, the general public can be provided with a means of checking the authenticity of a security document 5 simply and quickly.

Down-Converter weisen üblicherweise eine höhere Quantenausbeute als Up-Converter auf, weshalb es günstig erscheint, wenn bei der zweiten lumineszierenden Substanz der Frequenzbereich der Emission niedriger als der Frequenzbereich der Anregung ist.Down converters usually have a higher quantum efficiency than up-converters, which is why it seems favorable if, in the case of the second luminescent substance, the frequency range of the emission is lower than the frequency range of the excitation.

Ein zusätzliches Sicherheitsmerkmal wird ausgebildet, wenn die erste lumineszierende Substanz und die zweite lumineszierende Substanz in einem vorgebbaren Verhältnis vorhanden sind. Dabei kann das Verhältnis der Emission der ersten lumineszierenden Substanz zu der Emission der zweiten lumineszierenden Substanz bestimmt werden, wobei das Verhältnis durch die entsprechenden Mengen der lumineszierenden Substanzen bestimmt ist.An additional security feature is formed when the first luminescent substance and the second luminescent substance are present in a predeterminable ratio. In this case, the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance can be determined, the ratio being determined by the corresponding quantities of the luminescent substances.

Das Sicherheitselement 1 kann derart ausgestaltet sein, dass ein erster Bereich 11 die erste lumineszierende Substanz und die zweite lumineszierende Substanz, ein zweiter Bereich 12 lediglich die erste lumineszierende Substanz und ein dritter Bereich 13 lediglich die zweite lumineszierende Substanz umfasst. Ein derartiges Sicherheitselement 1 ist in Fig. 1 dargestellt. In Fig. 2 ist die Emission der ersten lumineszierenden Substanz bei deren Anregung dargestellt. Dabei ist ersichtlich, dass die Konzentration der ersten lumineszierenden Substanz nicht konstant ist und in der Darstellung von links nach rechts ansteigend ist. In Fig. 3 ist die Emission der zweiten lumineszierenden Substanz bei deren Anregung dargestellt. Dabei ist ersichtlich, dass die Konzentration der zweiten lumineszierenden Substanz in der Darstellung von links nach rechts abnehmend ist. In Fig. 4 ist die Emission der zweiten lumineszierenden Substanz bei Anregung der ersten lumineszierenden Substanz gezeigt. Dabei tritt eine Emission nur im ersten Bereich 11 auf, in dem beide lumineszierenden Substanzen vorhanden sind. Durch dieses Zusammenwirken der ersten lumineszierenden Substanz und der zweiten lumineszierenden Substanz wird eine hohe Fälschungssicherheit des Sicherheitsdokumentes erreicht.The security element 1 can be designed in such a way that a first region 11 comprises the first luminescent substance and the second luminescent substance, a second region 12 only the first luminescent substance and a third region 13 only the second luminescent substance. Such a security element 1 is in Fig. 1 shown. In Fig. 2 is the emission of the first luminescent substance is shown in their excitation. It can be seen that the concentration of the first luminescent substance is not constant and is increasing in the representation from left to right. In Fig. 3 the emission of the second luminescent substance is shown when excited. It can be seen that the concentration of the second luminescent substance in the illustration is decreasing from left to right. In Fig. 4 the emission of the second luminescent substance upon excitation of the first luminescent substance is shown. In this case, an emission occurs only in the first region 11, in which both luminescent substances are present. By this interaction of the first luminescent substance and the second luminescent substance, a high security against forgery of the security document is achieved.

Eine unterschiedliche Konzentration der ersten lumineszierenden Substanz und/oder der zweiten lumineszierenden Substanz kann beispielsweise mittels unterschiedlichen Linienbreiten und/oder Linienabständen in dem ersten Bereich 11, dem zweiten Bereich 12 und/oder dem dritten Bereich 13 erzielt werden. Es kann auch die Ausbildung von Barcodes durch eine entsprechende Anordnung der Bereiche 11, 12, 13 erreicht werden.A different concentration of the first luminescent substance and / or the second luminescent substance can be achieved, for example, by means of different line widths and / or line spacings in the first region 11, the second region 12 and / or the third region 13. It can also be the formation of barcodes by a corresponding arrangement of the areas 11, 12, 13 can be achieved.

Bei anderen Ausführungen des erfindungsgemäßen Sicherheitselementes 1 können auch lediglich der erste Bereich 11, der erste Bereich 11 und der zweite Bereich 12 oder der erste Bereich 11 und der dritte Bereich 13 vorgesehen sein.In other embodiments of the security element 1 according to the invention, only the first region 11, the first region 11 and the second region 12 or the first region 11 and the third region 13 may be provided.

Bei einem Verfahren zur Überprüfung der Echtheit und/oder Güte des Sicherheitsdokumentes 5 mit dem Sicherheitselement 1 können ein, zwei oder auch alle drei Emissionen gemäß denIn a method for checking the authenticity and / or quality of the security document 5 with the security element 1, one, two or even all three emissions can be determined according to the

Fig. 2 bis 4 herangezogen werden. Weiters kann die erste lumineszierende Substanz mittels einer Lichtquelle angeregt werden und dass das Verhältnis der Emission der ersten lumineszierenden Substanz zu der Emission der zweiten lumineszierenden Substanz bestimmt werden. Durch die Berücksichtigung dieses Verhältnisses kann die Fälschungssicherheit weiter verbessert werden. Fig. 2 to 4 be used. Furthermore, the first luminescent substance can be excited by means of a light source and the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance can be determined. By taking this ratio into account, the security against counterfeiting can be further improved.

Das Sicherheitselement 1 kann einfach in einem Druckschritt hergestellt werden, wenn eine Druckfarbe verwendet wird, die die erste lumineszierende Substanz und die zweite lumineszierende Substanz umfasst.The security element 1 can be easily manufactured in a printing step when using a printing ink comprising the first luminescent substance and the second luminescent substance.

Für die Sicherstellung einer hohen Fälschungssicherheit hat es sich weiters als günstig erwiesen, wenn die erste lumineszierende Substanz und die zweite lumineszierende Substanz lediglich in geringen Konzentrationen im Sicherheitselement vorkommen, da dadurch das Auffinden dieser Substanzen für einen Fälscher erschwert werden. Insbesondere bei der Verwendung eines Up-Converters kann durch das Vorsehen des Up-Converters als extern angeregte Substanz des Sicherheitselementes 1 auch mit einer geringen Konzentration der lumineszierenden Substanzen eine hinreichende Güte des Sicherheitselementes 1 erreicht werden, die eine zuverlässige Detektion sicherstellt. Durch die geringen Konzentrationen kann das Sicherheitselement 1 drucktechnisch einfach und kostengünstig realisiert werden. Weiters kann durch die Wahl einer geringen Konzentration das Auffinden des Sicherheitsmerkmals durch einen Fälscher erschwert werden. In anderen Ausführungsformen kann das Sicherheitselement 1 auch als Klebefolie, als Bestandteil eines Hologramms, als Streifenelement od. dgl. ausgebildet sein.In order to ensure a high security against forgery, it has furthermore proved to be advantageous if the first luminescent substance and the second luminescent substance occur only in low concentrations in the security element, as this makes it difficult for a counterfeiter to find these substances. In particular, when using an up-converter can be provided by the provision of the up-converter as an externally excited substance of the security element 1 even with a low concentration of Luminescent substances a sufficient quality of the security element 1 can be achieved, which ensures reliable detection. Due to the low concentrations, the security element 1 can be realized by printing technology simply and inexpensively. Furthermore, the choice of a low concentration makes it difficult to find the security feature by a counterfeiter. In other embodiments, the security element 1 can also be designed as an adhesive film, as a component of a hologram, as a strip element or the like.

Neben der ersten lumineszierenden Substanz und der zweiten lumineszierenden Substanz kann das Sicherheitselement 1 noch weitere Sicherheitsmerkmale, beispielsweise eine weitere lumineszierende Substanz umfassen.In addition to the first luminescent substance and the second luminescent substance, the security element 1 can also comprise further security features, for example a further luminescent substance.

Claims (10)

  1. A security element (1) for a security document (5), with the security document (5) comprising a basic body (51) made of a basic material, comprising a first luminescent substance, with a second luminescent substance being provided, energy transmission is provided between the first luminescent substance and the second luminescent substance, with the frequency range of the excitation of one of the luminescent substances corresponding to the frequency range of the emission of the other of the luminescent substances, and the first luminescent substance is thermally unstable at the inflammation point of the basic material and/or at a temperature of 185°C, characterized in that a first area (11) comprises the first luminescent substance and the second luminescent substance and that a second area merely comprises the first luminescent substance.
  2. A security element (1) according to claim 1, characterized in that the first luminescent substance and the second luminescent substance are present at a predeterminable ratio.
  3. A security element (1) according to claim 1 or 2, characterized in that the concentration of the first luminescent substance rises in one direction.
  4. A security element (1) according to claim 1, 2 or 3, characterized in that a third area (13) comprises merely the second luminescent substance.
  5. A security element (1) according to one of the claims 1 to 4, characterized in that in the first luminescent substance the frequency range of the emission is higher than the frequency range of the excitation.
  6. A security element (1) according to one of the claims 1 to 5, characterized in that the frequency range of the excitation of the second luminescent substance corresponds to the frequency range of the emission of the first luminescent substance.
  7. A security element (1) according to one of the claims 1 to 6, characterized in that the frequency range of the emission of the first luminescent substance lies in the visible range.
  8. A security element (1) according to one of the claims 1 to 7, characterized in that the in the second luminescent substance the frequency range of the emission is lower than the frequency range of the excitation.
  9. A security document (5) with a security element (1) according to one of the claims 1 to 8.
  10. A method for verifying the authenticity and/or quality of a security document (5) with a security element (1) according to one of the claims 1 to 8, comprising a first luminescent substance, with the first luminescent substance being excited by means of a light source, and with the second luminescent substance being excited by the emission of the first luminescent substance, with the ratio of the emission of the first luminescent substance to the emission of the second luminescent substance being determined.
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ATE431786T1 (en) 2009-06-15
DE502006003773D1 (en) 2009-07-02
US7656511B2 (en) 2010-02-02
JP2008533622A (en) 2008-08-21
US20090231572A1 (en) 2009-09-17
AU2006227581B2 (en) 2011-07-07
RU2007138976A (en) 2009-04-27
ES2327560T3 (en) 2009-10-30
PL1863651T3 (en) 2009-12-31
EP1863651A1 (en) 2007-12-12
CA2599427A1 (en) 2006-09-28
AT502868B1 (en) 2008-06-15
RU2401745C2 (en) 2010-10-20
CA2599427C (en) 2013-09-03
AU2006227581A1 (en) 2006-09-28
ZA200708590B (en) 2008-07-30
AT502868A1 (en) 2007-06-15
WO2006099642A1 (en) 2006-09-28

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