EP2453418A1 - Method and device for assessing the authenticity of bank notes with security windows - Google Patents

Method and device for assessing the authenticity of bank notes with security windows Download PDF

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Publication number
EP2453418A1
EP2453418A1 EP11007877A EP11007877A EP2453418A1 EP 2453418 A1 EP2453418 A1 EP 2453418A1 EP 11007877 A EP11007877 A EP 11007877A EP 11007877 A EP11007877 A EP 11007877A EP 2453418 A1 EP2453418 A1 EP 2453418A1
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EP
European Patent Office
Prior art keywords
radiation
banknote
sensor
wavelength
range
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Granted
Application number
EP11007877A
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German (de)
French (fr)
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EP2453418B1 (en
Inventor
Armin Dr. Stöckli
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BEB Industrie Elektronik AG
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BEB Industrie Elektronik AG
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Publication of EP2453418A1 publication Critical patent/EP2453418A1/en
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Classifications

    • 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
    • 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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/387—Special inks absorbing or reflecting ultraviolet light
    • 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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • 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

Definitions

  • the invention is based on a method and a device for checking the authenticity of banknotes with at least one completely or partially transparent security window.
  • Banknotes can have transparent, semi-transparent or semi-transparent security windows.
  • the banknote can consist of a banknote substrate which is made up of several layers.
  • the windows are preferably made of a transparent polymer layer, which are equipped with a fluorescent substance in the UV wavelength range.
  • the polymer layer can be provided with special UV pigments, which absorb the incident UV radiation and pass into an excited energy level. Upon return to the initial energetic state, radiation of a longer wavelength than the exciting radiation is emitted. The wavelength of the emitted radiation depends on the UV pigments.
  • the detection of the emitted radiation can serve to detect the window of a banknote by means of suitable sensors.
  • a real banknote with window can be distinguished from a counterfeit banknote which instead of a window has only one hole or contains a window without UV pigments.
  • further recognition features can also be integrated into the polymer layer or the other layers of the banknote substrate. This is preferably done by additives that are already integrated in the production or applied by coating or printing. These additions are also referred to as taggants. They are authenticated to authenticate banknotes by means of suitable sensors. This happens, for example, by exciting the additives with radiation certain wavelength and by detection of emitted and / or reflected radiation.
  • the remaining banknote substrate is equipped with at least one layer which has no or at most a negligible emission and reflection when irradiated in the UV wavelength range.
  • the banknote substrates may be provided, for example, with TiO 2 .
  • TiO 2 is a stable, white, non-fluorescent pigment with good spreading properties.
  • Incident UV radiation is absorbed due to the TiO 2 , without causing any significant emission.
  • the banknote does not fluoresce in the UV range.
  • a genuine bill can be distinguished from a forgery made of, for example, ordinary paper used in printers and copiers.
  • This known copy paper is equipped with fluorescent whitening agents. If this paper is exposed to UV radiation, it preferably emits in the visible wavelength range. Real banknotes can thus be distinguished from counterfeit notes by the absence of UV fluorescence.
  • the object of the present invention is to provide a method and a device with which both the UV fluorescence of the window of a banknote and the absence of UV fluorescence of the remaining banknote can be detected in one step and with one sensor ,
  • the inventive method is characterized in that the banknotes are irradiated with radiation of a wavelength in the UV range of the spectrum.
  • the irradiation takes place in such a way that the entire banknote is exposed to the irradiation of the wavelength in the UV range. This happens for example, by means of a radiation source which irradiates the banknotes in an elongate section.
  • the width of the section is for example 5 to 20 mm. Over the width results, for example, a parabolic illumination profile, which has a maximum in the middle. This position is ideal for the placement of a sensor.
  • the banknotes are transported in a transporting direction perpendicular to the longitudinal direction of the elongated section. During transport, the banknotes are moved relative to the radiation source, so that the entire banknote is irradiated. In addition, a large-area irradiation of the banknote can also take place.
  • the radiation emitted and / or reflected by the banknote is detected spatially resolved by means of a sensor.
  • the sensitivity of the sensor in the region of the wavelength of the exciting radiation is smaller than in the region of the radiation emitted by the banknote or the sensor has no sensitivity in the region of the wavelength of the exciting radiation.
  • the wavelength of the exciting radiation is outside the sensitivity range of the sensor.
  • the sensitivity range of the sensor has a lower limit and an upper limit of the detected wavelengths. Wavelengths outside these limits are not detected by the sensor and are not detected.
  • the low or absent sensitivity in the region of the wavelength of the exciting and incident radiation results in that the radiation reflected by the banknote is not detected or with substantially lower sensitivity than the radiation emitted by fluorescence from the banknote. It is particularly advantageous if the product of the fluorescence-free direct scattering of the genuine banknotes on the one hand and the sensitivity of the sensor in the range of the wavelength of the incident radiation on the other hand is smaller than the product of the fluorescence to be examined at the wavelength ⁇ on the one hand and the sensitivity of Sensor in the region of this wavelength ⁇ on the other hand. This applies in particular to the intensity of the fluorescence-free direct scattering and the intensity of the Fluorescence.
  • the direct scattering power of the banknotes is small at those wavelengths at which the banknotes absorb the UV radiation due to certain pigments.
  • the banknote In the area of the window, the banknote has a UV fluorescence.
  • the incident radiation causes a transition of the UV pigments in the polymer layer of the window to an excited energy level.
  • a radiation of a wavelength which is greater than the wavelength of the exciting radiation is emitted in the region of the window of the banknote.
  • This wavelength of the emitted radiation is part of the sensitivity range of the sensor. It is therefore detected by the sensor. In this way, by means of a sensor, a window of a genuine banknote equipped with UV pigments can be distinguished from the window of a counterfeit banknote which has no corresponding UV pigments.
  • the incident UV radiation is absorbed without fluorescence of a wavelength which lies within the sensitivity range of the sensor. This is due to the banknote substrate, which has no UV fluorescence.
  • the banknote substrate is equipped with TiO 2 for this purpose, for example. These include rutile and anatase. TiO 2 also has the property that radiation in the UV wavelength range is not or only to a limited extent reflected. In the case of rutile, the reflection is small at wavelengths smaller than about 380 nm. In the case of anatase, the reflection is small at wavelengths smaller than about 350 nm. In any case, the sensor does not detect radiation emitted by the area outside the window of a genuine banknote. In this way, a genuine banknote can be distinguished from a counterfeit banknote from a substrate having a UV fluorescence.
  • the sensor detects the entire surface of a banknote facing it.
  • the sensor may be a line sensor act.
  • the bill is moved relative to the sensor in a transport direction that is perpendicular to the longitudinal direction of the line sensor.
  • the line sensor preferably consists of a plurality of sensor elements, so that the radiation emitted by a banknote radiation can be detected spatially resolved.
  • the radiation emitted upon excitation with radiation from a real banknote with window has a characteristic profile.
  • the window is clearly recognizable as a signal in this profile, while the remainder of the bill appears dark in the absence of UV fluorescence.
  • This signal is quantitatively greater than the UV fundamental fluorescence of the remainder of the banknote substrate plus the direct radiation reflected from the remainder of the banknote substrate.
  • a banknote can have further features that can be recognized in the UV range, which also generate a signal when irradiated in the UV range at the sensor. Such features may be printed on a banknote or integrated into the banknote substrate as fibers.
  • both the UV fluorescence of the window of a banknote and the absence of UV fluorescence of the area outside the window of a banknote can be detected with a sensor and in one step.
  • the irradiation of the banknote takes place with a radiation whose wavelength is less than 380 nm.
  • a radiation whose wavelength is less than 380 nm This is particularly advantageous when the banknotes have TiO 2 rutile.
  • the incident and the excitation of the UV pigments of the window of a banknote serving radiation for example, have a wavelength of 365 nm.
  • the irradiation of the banknote takes place with radiation whose wavelength is less than 350 nm. This is particularly advantageous if the banknotes have anatase as TiO 2 .
  • only radiation is detected with the sensor whose wavelength is greater than 380 nm with the sensor.
  • a wavelength of 380 nm forms the lower limit of the sensitivity range of the sensor.
  • the upper limit can be in the red or infrared spectral range, so that in the case of fluorescence, radiation with a wavelength in the visible or infrared spectral range can be detected.
  • the radiation reflected and / or emitted by the entire surface of a banknote facing the sensor is detected.
  • a sensor scans the entire surface of a banknote, or that a sensor has a plurality of sensor elements arranged in one dimension, and that the sensor and banknote are moved relative to one another.
  • the device according to the invention for checking the authenticity of banknotes with transparent security windows with the features of claim 6 is characterized in that it is equipped with at least one UV radiation source which irradiates a banknote with radiation of a wavelength or a wavelength range of the UV spectral range , Furthermore, it is equipped with at least one sensor which records, with spatial resolution, the radiation reflected and / or emitted by the banknote.
  • the sensor has a sensitivity range with an upper limit and a lower limit. Wavelengths that are within the sensitivity range are detected by the sensor. Wavelengths outside the sensitivity range are not detected by the sensor.
  • the wavelength of the radiation source is either less than the lower limit of the sensitivity range of the sensor or the sensitivity of the sensor in the range of the wavelength of the exciting radiation is smaller than in the area of the radiation emitted by the banknote.
  • the sensor thus preferably detects radiation which is emitted by a banknote and whose wavelength is greater than the wavelength of the radiation source.
  • the upper limit of the wavelength is advantageously set so that the sensor detects the entire visible spectral range. In this way, the sensor can be used to detect emitted and / or reflected radiation in the entire visible spectral range.
  • the sensor can be used not only for detection according to the method according to the invention but also for further checking methods in banknotes.
  • the large sensitivity range is advantageous. A single sensor can be used for all verification procedures.
  • the UV radiation source on several juxtaposed in a row UV LEDs. These serve to illuminate the radiation source facing surface within an elongate portion.
  • the UV LEDs can be arranged in one dimension. If the banknote is moved relative to the LEDs in a transport direction perpendicular to the row of LEDs, then the entire banknote is illuminated.
  • the wavelengths of the UV radiation source are smaller than 380 nm. This has the advantage that, in combination with a sensor which detects only wavelengths greater than 380 nm, the radiation reflected from a banknote whose wavelength is identical is with the wavelength of the UV radiation source, not captured and thus faded out.
  • the wavelengths of the UV radiation source are less than 350 nm.
  • the senor has a line sensor, to which the banknotes are moved at a relative speed. In this way, the entire radiation emitted by the surface of a banknote can be detected.
  • the lower limit of the sensitivity range of the sensor is 380 nm.
  • FIG. 1 shows a banknote 1 of a polymer substrate with a transparent window 2.
  • the banknote substrate has two polymer layers 3 and 4, between which a Lamination layer 5 is arranged.
  • UV pigments are embedded, which provide for UV fluorescence.
  • the UV pigments may alternatively or cumulatively be embedded in the polymer layer.
  • more taggants can be integrated.
  • the polymer layers 3 and 5 and the lamination layer 5 are transparent. They are covered to the outside by two opaque layers 6 and 7.
  • the two opaque layers 6 and 7 have openings in the region of the window 2, so that the transparent polymer layers 3 and 4 with the lamination layer 5 are visible.
  • the note image of the banknote is printed.
  • the two opaque layers with TiO 2 which serves as a UV-absorbing, non-fluorescent Weissmacher here.
  • the banknote 1 is transported by means of a transport device not shown in the drawing in a transport direction which is directed perpendicular to the illustrated image plane.
  • a plurality of UV radiation sources 8 are arranged in the form of UV LEDs which irradiate the entire upwardly facing surface of the banknote 1.
  • the radiation striking the opaque layer 6 is absorbed. There is no reflection and no emission due to fluorescence due to the TiO 2 contained in the opaque layer.
  • the UV radiation impinging on the polymer layer 3 in the region of the window reaches the lamination layer where it leads to fluorescence.
  • the emitted radiation has a greater wavelength than the incident radiation of the UV radiation sources. It is detected by a sensor, not shown in the drawing. This sensor has the property that it can not detect radiation in the wavelength range of the UV radiation source. It is sensitive only to the larger wavelengths of emitted radiation. As the sensor detects the radiation in a spatially resolved manner, the bank note appears dark to the area of the window.
  • FIG. 2 a banknote 10 is shown from a paper substrate.
  • the banknote also has a window 11.
  • the banknote substrate has two Paper layers 12 and 13, which are equipped with TiO 2 as a non-fluorescent Weissraum. Between the two paper layers 12 and 13, a transparent polymer layer 14 is embedded, in which UV pigments are embedded as Taggants.
  • the two paper layers 12 and 13 have openings in the region of the window 11, so that the polymer layer 14 is visible. If UV radiation of the UV radiation sources 8 falls on the banknote 11 in the region of the window 11, this radiation is absorbed and emits radiation having a greater wavelength than the incident radiation. This can be detected by a sensor, not shown in the drawing. For this sensor applies as appropriate for the FIG. 1 mentioned sensor.
  • the UV radiation striking the bill 10 outside the window is absorbed without reflection or emission taking place. Even with this banknote, the sensor detects radiation only in the region of the window 11. In addition, the banknote for the sensor appears dark.
  • FIG. 3 a further embodiment of a banknote 15 is shown from a paper substrate.
  • the window 16 is a semi-transparent window. Only one of the two paper layers, namely the paper layer 12, has an opening.
  • the second paper layer 17 of the banknote 15 is not provided with an opening in the region of the window 16.
  • the banknote can be irradiated from two sides by radiation sources 8 in order to detect the differences with respect to the window.
  • the UV fluorescence of the polymer layer 14 can only be detected on one side of the banknote. In the area of the banknote surrounding the window and on the side of the banknote 15 facing away from the window 16, no UV fluorescence can be detected, since the paper layer contains TiO 2 .

Abstract

The method involves providing the banknotes (1) with bank note substrate having an opaque layer (6,7) for absorbing ultraviolet radiation. The sensitivity of the sensor in the area of the wave length of the stimulating radiation, is smaller than the sensitivity of the sensor in the area of the radiation which is generated by the banknote. The wave length of the stimulating radiation lies above the sensitivity area of the sensor. An independent claim is also included for a device for verifying the authenticity of banknotes.

Description

Die Erfindung geht aus von einem Verfahren und einer Vorrichtung zur Überprüfung der Echtheit von Banknoten mit mindestens einem ganz oder teilweise durchsichtigen Sicherheitsfenster.The invention is based on a method and a device for checking the authenticity of banknotes with at least one completely or partially transparent security window.

Banknoten können durchsichtige, halbtransparente oder teiltransparente Sicherheitsfenster aufweisen. Dabei kann die Banknote aus einem Banknotensubstrat bestehen, das aus mehreren Schichten aufgebaut ist. Die Fenster bestehen dabei bevorzugt aus einer durchsichtigen Polymerschicht, welche mit einer im UV-Wellenlängenbereich fluoreszierenden Substanz ausgestattet sind. Hierzu kann die Polymerschicht mit speziellen UV-Pigmenten versehen sein, die die einfallende UV-Strahlung absorbieren und in ein angeregtes Energieniveau übergehen. Bei der Rückkehr in den energetischen Ausgangszustand wird Strahlung mit einer größeren Wellenlänge als die anregende Strahlung emittiert. Die Wellenlänge der emittierten Strahlung hängt von den UV-Pigmenten ab. Der Nachweis der emittierten Strahlung kann dazu dienen, das Fenster einer Banknote mittels geeigneter Sensoren nachzuweisen. Auf diese Weise kann eine echte Banknote mit Fenster von einer gefälschten Banknote, welche anstelle eines Fensters lediglich ein Loch aufweist oder ein Fenster ohne UV-Pigmente enthält, unterschieden werden. Neben UV-Pigmenten können auch weitere Erkennungsmerkmale in die Polymerschicht oder die sonstigen Schichten des Banknotensubstrats integriert sein. Dies geschieht bevorzugt durch Zusätze, die bereits bei der Herstellung integriert oder durch Beschichtung oder Druck aufgebracht werden. Diese Zusätze werden auch als Taggants bezeichnet. Sie werden zur Überprüfung der Banknoten auf Echtheit mittels geeigneter Sensoren nachgewiesen. Dies geschieht beispielsweise durch Anregung der Zusätze mit Strahlung einer bestimmten Wellenlänge und durch Nachweis einer emittierten und/ oder reflektierten Strahlung.Banknotes can have transparent, semi-transparent or semi-transparent security windows. In this case, the banknote can consist of a banknote substrate which is made up of several layers. The windows are preferably made of a transparent polymer layer, which are equipped with a fluorescent substance in the UV wavelength range. For this purpose, the polymer layer can be provided with special UV pigments, which absorb the incident UV radiation and pass into an excited energy level. Upon return to the initial energetic state, radiation of a longer wavelength than the exciting radiation is emitted. The wavelength of the emitted radiation depends on the UV pigments. The detection of the emitted radiation can serve to detect the window of a banknote by means of suitable sensors. In this way, a real banknote with window can be distinguished from a counterfeit banknote which instead of a window has only one hole or contains a window without UV pigments. In addition to UV pigments, further recognition features can also be integrated into the polymer layer or the other layers of the banknote substrate. This is preferably done by additives that are already integrated in the production or applied by coating or printing. These additions are also referred to as taggants. They are authenticated to authenticate banknotes by means of suitable sensors. This happens, for example, by exciting the additives with radiation certain wavelength and by detection of emitted and / or reflected radiation.

Mit Ausnahme der Fenster ist das übrige Banknotensubstrat mit zumindest einer Schicht ausgestattet, die bei Bestrahlung im UV-Wellenlängenbereich keine oder allenfalls eine vernachlässigbare Emission und Reflektion aufweist. Dies gilt sowohl für Banknotensubstrate, welche auf Papier basieren als auch für Banknotensubstrate, welche auf Polymeren basieren. Hierzu können die Banknotensubstrate beispielsweise mit TiO2 versehen sein. TiO2 ist ein stabiles, weißes, nicht fluoreszierendes Pigment mit guten Streueigenschaften. Eine einfallende UV-Strahlung wird aufgrund des TiO2 absorbiert, ohne dass dies eine nennenswerte Emission zur Folge hat. Dies führt dazu, dass die Banknote im UV-Bereich nicht fluoresziert. Damit kann eine echte Banknote von einer Fälschung, welche beispielsweise aus üblichem Papier, wie es in Druckern und Kopiergeräten verwendet wird, unterschieden werden. Dieses bekannte Kopierpapier ist mit fluoreszierenden Weißmachern ausgestattet. Wird dieses Papier einer UV-Strahlung ausgesetzt, so emittiert es bevorzugt im sichtbaren Wellenlängenbereich. Echte Banknoten können damit von gefälschten Banknoten durch das Fehlen einer UV-Fluoreszenz unterschieden werden.With the exception of the windows, the remaining banknote substrate is equipped with at least one layer which has no or at most a negligible emission and reflection when irradiated in the UV wavelength range. This applies to both paper-based banknote substrates and polymer-based banknote substrates. For this purpose, the banknote substrates may be provided, for example, with TiO 2 . TiO 2 is a stable, white, non-fluorescent pigment with good spreading properties. Incident UV radiation is absorbed due to the TiO 2 , without causing any significant emission. As a result, the banknote does not fluoresce in the UV range. Thus, a genuine bill can be distinguished from a forgery made of, for example, ordinary paper used in printers and copiers. This known copy paper is equipped with fluorescent whitening agents. If this paper is exposed to UV radiation, it preferably emits in the visible wavelength range. Real banknotes can thus be distinguished from counterfeit notes by the absence of UV fluorescence.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Verfügung zu stellen, mit denen in einem Schritt und mit einem Sensor sowohl die UV-Fluoreszenz des Fensters einer Banknote als auch das Fehlen einer UV-Fluoreszenz der übrigen Banknote nachgewiesen werden kann.The object of the present invention is to provide a method and a device with which both the UV fluorescence of the window of a banknote and the absence of UV fluorescence of the remaining banknote can be detected in one step and with one sensor ,

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Anspruchs 1 und durch eine Vorrichtung mit den Merkmalen des Anspruchs 6 gelöst. Das erfindungsgemäße Verfahren zeichnet sich dadurch aus, dass die Banknoten mit einer Strahlung einer Wellenlänge im UV-Bereich des Spektrums bestrahlt werden. Die Bestrahlung erfolgt derart, dass die gesamte Banknote der Bestrahlung der Wellenlänge im UV-Bereich ausgesetzt ist. Dies erfolgt beispielsweise anhand einer Strahlungsquelle, die die Banknoten in einem länglichen Abschnitt bestrahlt. Die Breite des Abschnitts beträgt beispielsweise 5 bis 20 mm. Über die Breite ergibt sich beispielsweise ein parabelförmiges Beleuchtungsprofil, welches in der Mitte ein Maximum aufweist. Diese Position ist ideal für die Anordnung eines Sensors. Die Banknoten werden in einer Transportrichtung senkrecht zur Längsrichtung des länglichen Abschnitts transportiert. Beim Transport werden die Banknoten relativ zur Strahlungsquelle bewegt, so dass die gesamte Banknote bestrahlt wird. Darüber hinaus kann auch eine großflächige Bestrahlung der Banknote erfolgen.This object is achieved by a method having the features of claim 1 and by an apparatus having the features of claim 6. The inventive method is characterized in that the banknotes are irradiated with radiation of a wavelength in the UV range of the spectrum. The irradiation takes place in such a way that the entire banknote is exposed to the irradiation of the wavelength in the UV range. this happens for example, by means of a radiation source which irradiates the banknotes in an elongate section. The width of the section is for example 5 to 20 mm. Over the width results, for example, a parabolic illumination profile, which has a maximum in the middle. This position is ideal for the placement of a sensor. The banknotes are transported in a transporting direction perpendicular to the longitudinal direction of the elongated section. During transport, the banknotes are moved relative to the radiation source, so that the entire banknote is irradiated. In addition, a large-area irradiation of the banknote can also take place.

Die von der Banknote emittierte und/ oder reflektierte Strahlung wird mittels eines Sensors ortsaufgelöst erfasst. Dabei ist die Empfindlichkeit des Sensors im Bereich der Wellenlänge der anregenden Strahlung kleiner als im Bereich der von der Banknote emittierten Strahlung oder der Sensor weist in dem Bereich der Wellenlänge der anregenden Strahlung keine Empfindlichkeit auf. Im zweiten Fall ist die Wellenlänge der anregenden Strahlung außerhalb des Empfindlichkeitsbereichs des Sensors. Der Empfindlichkeitsbereich des Sensors weist eine Untergrenze und eine Obergrenze der erfassten Wellenlängen auf. Wellenlängen, die außerhalb dieser Grenzen liegen, werden durch den Sensor nicht erfasst und nicht nachgewiesen.The radiation emitted and / or reflected by the banknote is detected spatially resolved by means of a sensor. The sensitivity of the sensor in the region of the wavelength of the exciting radiation is smaller than in the region of the radiation emitted by the banknote or the sensor has no sensitivity in the region of the wavelength of the exciting radiation. In the second case, the wavelength of the exciting radiation is outside the sensitivity range of the sensor. The sensitivity range of the sensor has a lower limit and an upper limit of the detected wavelengths. Wavelengths outside these limits are not detected by the sensor and are not detected.

Die geringe oder nicht vorhandene Empfindlichkeit im Bereich der Wellenlänge der anregenden und einfallenden Strahlung führt dazu, dass die von der Banknote reflektierte Strahlung nicht erfasst wird oder mit wesentlich geringerer Empfindlichkeit als die durch Fluoreszenz von der Banknote emittierte Strahlung. Es ist insbesondere von Vorteil, wenn das Produkt aus der fluoreszenzlosen direkten Streuung der echten Banknoten einerseits und der Empfindlichkeit des Sensors im Bereich der Wellenlänge der einfallenden Strahlung andererseits kleiner ist als das Produkt aus der zu untersuchenden Fluoreszenz bei der Wellenlänge λ einerseits und der Empfindlichkeit des Sensors im Bereich dieser Wellenlänge λ andererseits. Dies gilt insbesondere für die Intensität der fluoreszenzlosen direkten Streuung und die Intensität der Fluoreszenz. Das direkte Streuvermögen der Banknoten ist bei denjenigen Wellenlängen klein, bei denen die Banknoten aufgrund bestimmter Pigmente die UV-Strahlung absorbieren.The low or absent sensitivity in the region of the wavelength of the exciting and incident radiation results in that the radiation reflected by the banknote is not detected or with substantially lower sensitivity than the radiation emitted by fluorescence from the banknote. It is particularly advantageous if the product of the fluorescence-free direct scattering of the genuine banknotes on the one hand and the sensitivity of the sensor in the range of the wavelength of the incident radiation on the other hand is smaller than the product of the fluorescence to be examined at the wavelength λ on the one hand and the sensitivity of Sensor in the region of this wavelength λ on the other hand. This applies in particular to the intensity of the fluorescence-free direct scattering and the intensity of the Fluorescence. The direct scattering power of the banknotes is small at those wavelengths at which the banknotes absorb the UV radiation due to certain pigments.

Im Bereich des Fensters weist die Banknote eine UV-Fluoreszenz auf. Die einfallende Strahlung sorgt für einen Übergang der UV-Pigmente in der Polymerschicht des Fensters in ein angeregtes Energieniveau. Bei der Rückkehr in den energetischen Ausgangszustand wird im Bereich des Fensters der Banknote eine Strahlung einer Wellenlänge emittiert, die größer ist als die Wellenlänge der anregenden Strahlung. Diese Wellenlänge der emittierten Strahlung ist Teil des Empfindlichkeitsbereichs des Sensors. Sie wird daher durch den Sensor erfasst. Auf diese Weise kann mittels eines Sensors ein mit UV-Pigmenten ausgestattetes Fenster einer echten Banknote von dem Fenster einer gefälschten Banknote, welches keine entsprechenden UV-Pigmente aufweist, unterschieden werden.In the area of the window, the banknote has a UV fluorescence. The incident radiation causes a transition of the UV pigments in the polymer layer of the window to an excited energy level. When returning to the energetic initial state, a radiation of a wavelength which is greater than the wavelength of the exciting radiation is emitted in the region of the window of the banknote. This wavelength of the emitted radiation is part of the sensitivity range of the sensor. It is therefore detected by the sensor. In this way, by means of a sensor, a window of a genuine banknote equipped with UV pigments can be distinguished from the window of a counterfeit banknote which has no corresponding UV pigments.

Außerhalb des Bereichs des Fensters einer Banknote wird die einfallende UV-Strahlung absorbiert, ohne dass eine Fluoreszenz einer Wellenlänge stattfindet, die im Empfindlichkeitsbereich des Sensors liegt. Dies liegt an dem Banknotensubstrat, welches keine UV-Fluoreszenz aufweist. Das Banknotensubstrat ist hierzu beispielsweise mit TiO2 ausgestattet. Hierzu zählen Rutil und Anatase. TiO2 hat ferner die Eigenschaft, dass Strahlung im UV-Wellenlängenbereich nicht oder nur in geringem Umfang reflektiert wird. Im Fall von Rutil ist die Reflektion bei Wellenlängen kleiner als ca. 380 nm gering. Im Fall von Anatase ist die Reflektion bei Wellenlängen kleiner als ca. 350 nm gering. Der Sensor erfasst in jedem Fall keine von dem Bereich außerhalb des Fensters einer echten Banknote emittierte Strahlung. Auf diese Weise kann eine echte Banknote von einer gefälschten Banknote aus einem eine UV-Fluoreszenz aufweisenden Substrat unterschieden werden.Outside the area of the window of a banknote, the incident UV radiation is absorbed without fluorescence of a wavelength which lies within the sensitivity range of the sensor. This is due to the banknote substrate, which has no UV fluorescence. The banknote substrate is equipped with TiO 2 for this purpose, for example. These include rutile and anatase. TiO 2 also has the property that radiation in the UV wavelength range is not or only to a limited extent reflected. In the case of rutile, the reflection is small at wavelengths smaller than about 380 nm. In the case of anatase, the reflection is small at wavelengths smaller than about 350 nm. In any case, the sensor does not detect radiation emitted by the area outside the window of a genuine banknote. In this way, a genuine banknote can be distinguished from a counterfeit banknote from a substrate having a UV fluorescence.

Der Sensor erfasst die gesamte ihm zugewandte Oberfläche einer Banknote. So kann es sich bei dem Sensor beispielsweise um einen Zeilensensor handeln. Die Banknote wird relativ zu dem Sensor in eine Transportrichtung bewegt, die senkrecht zur Längsrichtung des Zeilensensors verläuft. Der Zeilensensor besteht bevorzugt aus mehreren Sensorelementen, so dass die von einer Banknote emittierte Strahlung ortsaufgelöst erfasst werden kann. Damit weist die bei Anregung mit einer Strahlung von einer echten Banknote mit Fenster emittierte Strahlung ein charakteristisches Profil auf. Das Fenster ist in diesem Profil klar als Signal erkennbar, während die übrige Banknote in Ermangelung einer UV-Fluoreszenz dunkel erscheint. Dieses Signal ist quantitativ größer als die UV-Grundfluoreszenz des übrigen Banknotensubstrates plus die direkte von dem übrigen Banknotensubstrat reflektierte Strahlung. Eine Banknote kann weitere im UV-Bereich erkennbare Merkmale aufweisen, die bei Bestrahlung im UV-Bereich an dem Sensor ebenfalls ein Signal erzeugen. Derartige Merkmale können auf eine Banknote aufgedruckt sein oder als Fibern in das Banknotensubstrat integriert sein.The sensor detects the entire surface of a banknote facing it. For example, the sensor may be a line sensor act. The bill is moved relative to the sensor in a transport direction that is perpendicular to the longitudinal direction of the line sensor. The line sensor preferably consists of a plurality of sensor elements, so that the radiation emitted by a banknote radiation can be detected spatially resolved. Thus, the radiation emitted upon excitation with radiation from a real banknote with window has a characteristic profile. The window is clearly recognizable as a signal in this profile, while the remainder of the bill appears dark in the absence of UV fluorescence. This signal is quantitatively greater than the UV fundamental fluorescence of the remainder of the banknote substrate plus the direct radiation reflected from the remainder of the banknote substrate. A banknote can have further features that can be recognized in the UV range, which also generate a signal when irradiated in the UV range at the sensor. Such features may be printed on a banknote or integrated into the banknote substrate as fibers.

Damit kann mit einem Sensor und in einem Arbeitsschritt sowohl die UV-Fluoreszenz des Fensters einer Banknote als auch das Fehlen einer UV-Fluoreszenz des Bereichs außerhalb des Fensters einer Banknote nachgewiesen werden.Thus, both the UV fluorescence of the window of a banknote and the absence of UV fluorescence of the area outside the window of a banknote can be detected with a sensor and in one step.

Nach einer vorteilhaften Ausgestaltung der Erfindung erfolgt die Bestrahlung der Banknote mit einer Strahlung, deren Wellenlänge kleiner als 380 nm ist. Dies ist insbesondere von Vorteil, wenn die Banknoten als TiO2 Rutil aufweisen. Die einfallende und der Anregung der UV-Pigmente des Fensters einer Banknote dienende Strahlung kann beispielsweise eine Wellenlänge von 365 nm aufweisen.According to an advantageous embodiment of the invention, the irradiation of the banknote takes place with a radiation whose wavelength is less than 380 nm. This is particularly advantageous when the banknotes have TiO 2 rutile. The incident and the excitation of the UV pigments of the window of a banknote serving radiation, for example, have a wavelength of 365 nm.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung erfolgt die Bestrahlung der Banknote mit einer Strahlung, deren Wellenlänge kleiner als 350 nm ist. Dies ist insbesondere von Vorteil, wenn die Banknoten als TiO2 Anatase aufweisen.According to a further advantageous embodiment of the invention, the irradiation of the banknote takes place with radiation whose wavelength is less than 350 nm. This is particularly advantageous if the banknotes have anatase as TiO 2 .

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung wird mit dem Sensor nur Strahlung nachgewiesen, deren Wellenlänge größer als 380 nm ist. Dabei bildet eine Wellenlänge von 380 nm die Untergrenze des Empfindlichkeitsbereichs des Sensors. Die Obergrenze kann im roten oder infraroten Spektralbereich liegen, so dass im Falle der Fluoreszenz auch Strahlung mit einer Wellenlänge im sichtbaren oder infraroten Spektralbereich nachgewiesen werden kann.According to a further advantageous embodiment of the invention, only radiation is detected with the sensor whose wavelength is greater than 380 nm with the sensor. A wavelength of 380 nm forms the lower limit of the sensitivity range of the sensor. The upper limit can be in the red or infrared spectral range, so that in the case of fluorescence, radiation with a wavelength in the visible or infrared spectral range can be detected.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung wird die von der gesamten, dem Sensor zugewandten Oberfläche einer Banknote reflektierte und/ oder emittierte Strahlung erfasst. Dies wird beispielsweise dadurch erreicht, dass ein Sensor die gesamte Oberfläche einer Banknote abtastet, oder dass ein Sensor mehrere in einer Dimension angeordnete Sensorelemente aufweist, und dass Sensor und Banknote relativ zueinander bewegt werden.According to a further advantageous embodiment of the invention, the radiation reflected and / or emitted by the entire surface of a banknote facing the sensor is detected. This is achieved, for example, in that a sensor scans the entire surface of a banknote, or that a sensor has a plurality of sensor elements arranged in one dimension, and that the sensor and banknote are moved relative to one another.

Die erfindungsgemäße Vorrichtung zur Überprüfung der Echtheit von Banknoten mit durchsichtigen Sicherheitsfenstern mit den Merkmalen des Anspruchs 6 zeichnet sich dadurch aus, dass sie mit mindestens einer UV-Strahlungsquelle ausgestattet ist, welche eine Banknote mit einer Strahlung einer Wellenlänge oder eines Wellenlängenbereichs des UV-Spektralbereichs bestrahlt. Ferner ist sie mit mindestens einem Sensor ausgestattet, der ortsaufgelöst die von der Banknote reflektierte und/ oder emittierte Strahlung erfasst. Der Sensor weist einen Empfindlichkeitsbereich auf mit einer Obergrenze und eine Untergrenze. Wellenlängen, die innerhalb des Empfindlichkeitsbereichs sind, werden durch den Sensor erfasst. Wellenlängen außerhalb des Empfindlichkeitsbereichs werden durch den Sensor nicht erfasst. Die Wellenlänge der Strahlungsquelle ist entweder kleiner als die Untergrenze des Empfindlichkeitsbereichs des Sensors oder die Empfindlichkeit des Sensors im Bereich der Wellenlänge der anregenden Strahlung ist kleiner als im Bereich der von der Banknote emittierten Strahlung. Dadurch wird entweder gar keine von der Banknote reflektierte Strahlung nachgewiesen oder die reflektierte Strahlung wird mit wesentlich geringerer Empfindlichkeit nachgewiesen als die von der Banknote aufgrund von Fluoreszenz emittierte Strahlung. Der Sensor weist damit bevorzugt Strahlung nach, die von einer Banknote emittiert wird, und deren Wellenlänge größer ist als die Wellenlänge der Strahlungsquelle. Die Obergrenze der Wellenlänge wird vorteilhafterweise so vorgegeben, dass der Sensor den gesamten sichtbaren Spektralbereich erfasst. Auf diese Weise kann der Sensor verwendet werden, um emittierte und/ oder reflektierte Strahlung im gesamten sichtbaren Spektralbereich zu erfassen. Dabei kann der Sensor grundsätzlich nicht nur zum Nachweis gemäß dem erfindungsgemäßen Verfahren sondern zusätzlich auch für weitere Überprüfungsverfahren bei Banknoten eingesetzt werden. Der große Empfindlichkeitsbereich ist dabei von Vorteil. Dabei kann ein einziger Sensor für alle Überprüfungsverfahren eingesetzt werden.The device according to the invention for checking the authenticity of banknotes with transparent security windows with the features of claim 6 is characterized in that it is equipped with at least one UV radiation source which irradiates a banknote with radiation of a wavelength or a wavelength range of the UV spectral range , Furthermore, it is equipped with at least one sensor which records, with spatial resolution, the radiation reflected and / or emitted by the banknote. The sensor has a sensitivity range with an upper limit and a lower limit. Wavelengths that are within the sensitivity range are detected by the sensor. Wavelengths outside the sensitivity range are not detected by the sensor. The wavelength of the radiation source is either less than the lower limit of the sensitivity range of the sensor or the sensitivity of the sensor in the range of the wavelength of the exciting radiation is smaller than in the area of the radiation emitted by the banknote. As a result, either no radiation reflected from the banknote is detected or the reflected radiation becomes significantly less sensitive detected as the radiation emitted by the banknote due to fluorescence. The sensor thus preferably detects radiation which is emitted by a banknote and whose wavelength is greater than the wavelength of the radiation source. The upper limit of the wavelength is advantageously set so that the sensor detects the entire visible spectral range. In this way, the sensor can be used to detect emitted and / or reflected radiation in the entire visible spectral range. In principle, the sensor can be used not only for detection according to the method according to the invention but also for further checking methods in banknotes. The large sensitivity range is advantageous. A single sensor can be used for all verification procedures.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung weist die UV-Strahlungsquelle mehrere nebeneinander in einer Reihe angeordnete UV-LEDs auf. Diese dienen dazu, die der Strahlungsquelle zugewandte Oberfläche innerhalb eines länglichen Abschnitts zu beleuchten. Die UV-LEDs können in einer Dimension angeordnet sein. Wird die Banknote relativ zu den LEDs in einer Transportrichtung senkrecht zu der Reihe der LEDs bewegt, so erfolgt eine Beleuchtung der gesamten Banknote.According to a further advantageous embodiment of the invention, the UV radiation source on several juxtaposed in a row UV LEDs. These serve to illuminate the radiation source facing surface within an elongate portion. The UV LEDs can be arranged in one dimension. If the banknote is moved relative to the LEDs in a transport direction perpendicular to the row of LEDs, then the entire banknote is illuminated.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung sind die Wellenlängen der UV-Strahlungsquelle kleiner als 380 nm. Dies hat den Vorteil, dass in Kombination mit einem Sensor, der nur Wellenlängen größer als 380 nm erfasst, die von einer Banknote reflektierte Strahlung, deren Wellenlänge identisch ist mit der Wellenlänge der UV-Strahlungsquelle, nicht erfasst und damit ausgeblendet wird.According to a further advantageous embodiment of the invention, the wavelengths of the UV radiation source are smaller than 380 nm. This has the advantage that, in combination with a sensor which detects only wavelengths greater than 380 nm, the radiation reflected from a banknote whose wavelength is identical is with the wavelength of the UV radiation source, not captured and thus faded out.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung sind die Wellenlängen der UV-Strahlungsquelle kleiner als 350 nm.According to a further advantageous embodiment of the invention, the wavelengths of the UV radiation source are less than 350 nm.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung weist der Sensor einen Zeilensensor auf, zu dem die Banknoten mit einer Relativgeschwindigkeit bewegt werden. Auf diese Weise kann die gesamte, von der Oberfläche einer Banknote emittierte Strahlung erfasst werden.According to a further advantageous embodiment of the invention, the sensor has a line sensor, to which the banknotes are moved at a relative speed. In this way, the entire radiation emitted by the surface of a banknote can be detected.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung beträgt die Untergrenze des Empfindlichkeitsbereichs des Sensors 380 nm.According to a further advantageous embodiment of the invention, the lower limit of the sensitivity range of the sensor is 380 nm.

Weitere Vorteile und vorteilhaftes Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous embodiments of the invention are the following description, the drawings and claims removed.

Zeichnungdrawing

In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen:

Figur 1
Banknote aus einem Polymersubstrat im Querschnitt mit mehreren Strahlungsquellen,
Figur 2
Banknote aus einem Papiersubstrat im Querschnitt mit mehreren Strahlungsquellen.
In the drawing, an embodiment of the invention is shown. Show it:
FIG. 1
Banknote of a polymer substrate in cross-section with a plurality of radiation sources,
FIG. 2
Banknote from a paper substrate in cross section with several radiation sources.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In den Figuren 1 und 2 sind Banknoten mit transparenten Fenstern im Querschnitt dargestellt, wobei die beiden Banknoten aus verschiedenen Banknotensubstraten bestehen. Figur 1 zeigt eine Banknote 1 aus einem Polymersubstrat mit einem durchsichtigen Fenster 2. Das Banknotensubstrat weist zwei Polymerschichten 3 und 4 auf, zwischen denen sich eine Lamination-Schicht 5 angeordnet ist. In diese Lamination-Schicht 5 sind UV-Pigmente eingebettet, die für eine UV-Fluoreszenz sorgen. Die UV-Pigmente können alternativ oder kumulativ auch in die Polymerschicht eingebettet sein. In die Lamination-Schicht 5 können weitere Taggants integriert sein. Die Polymerschichten 3 und 5 sowie die Lamination-Schicht 5 sind durchsichtig. Sie sind nach außen durch zwei opake Schichten 6 und 7 abgedeckt. Die beiden opaken Schichten 6 und 7 weisen im Bereich des Fensters 2 Öffnungen auf, so dass die durchsichtigen Polymerschichten 3 und 4 mit der Lamination-Schicht 5 sichtbar sind. Auf die opaken Schichten 6 und 7 ist das Notenbild der Banknote aufgedruckt. Ferner weisen die beiden opaken Schichten mit TiO2 auf, das hierbei als UV-absorbierender, nicht-fluoreszierender Weissmacher dient.In the Figures 1 and 2 Banknotes with transparent windows are shown in cross-section, wherein the two banknotes consist of different banknote substrates. FIG. 1 shows a banknote 1 of a polymer substrate with a transparent window 2. The banknote substrate has two polymer layers 3 and 4, between which a Lamination layer 5 is arranged. In this lamination layer 5 UV pigments are embedded, which provide for UV fluorescence. The UV pigments may alternatively or cumulatively be embedded in the polymer layer. In the lamination layer 5 more taggants can be integrated. The polymer layers 3 and 5 and the lamination layer 5 are transparent. They are covered to the outside by two opaque layers 6 and 7. The two opaque layers 6 and 7 have openings in the region of the window 2, so that the transparent polymer layers 3 and 4 with the lamination layer 5 are visible. On the opaque layers 6 and 7, the note image of the banknote is printed. Furthermore, the two opaque layers with TiO 2 , which serves as a UV-absorbing, non-fluorescent Weissmacher here.

Die Banknote 1 wird mittels einer in der Zeichnung nicht dargestellten Transporteinrichtung in eine Transportrichtung transportiert, die senkrecht zur dargestellten Bildebene gerichtet ist. Oberhalb der Transporteinrichtung sind mehrere UV-Strahlungsquellen 8 in Form von UV-LEDs angeordnet, die die gesamte nach oben weisende Oberfläche der Banknote 1 bestrahlen. Die auf die opake Schicht 6 treffende Strahlung wird absorbiert. Es findet aufgrund des in der opaken Schicht enthaltenen TiO2 keine Reflexion und keine Emission in Folge von Fluoreszenz statt. Die im Bereich des Fensters auf die Polymerschicht 3 treffende UV-Strahlung gelangt bis zur Lamination-Schicht und führt dort zur Fluoreszenz. Die emittierte Strahlung weist eine größere Wellenlänge auf als die einfallende Strahlung der UV-Strahlungsquellen. Sie wird durch einen in der Zeichnung nicht dargestellten Sensor nachgewiesen. Dieser Sensor hat die Eigenschaft, dass er Strahlung im Wellenlängenbereich der UV-Strahlungsquelle nicht nachweisen kann. Er ist nur für die größeren Wellenlängen der emittierten Strahlung empfindlich. Da der Sensor die Strahlung ortsaufgelöst nachweist, erscheint für ihn die Banknote bis auf den Bereich des Fensters dunkel.The banknote 1 is transported by means of a transport device not shown in the drawing in a transport direction which is directed perpendicular to the illustrated image plane. Above the transport device a plurality of UV radiation sources 8 are arranged in the form of UV LEDs which irradiate the entire upwardly facing surface of the banknote 1. The radiation striking the opaque layer 6 is absorbed. There is no reflection and no emission due to fluorescence due to the TiO 2 contained in the opaque layer. The UV radiation impinging on the polymer layer 3 in the region of the window reaches the lamination layer where it leads to fluorescence. The emitted radiation has a greater wavelength than the incident radiation of the UV radiation sources. It is detected by a sensor, not shown in the drawing. This sensor has the property that it can not detect radiation in the wavelength range of the UV radiation source. It is sensitive only to the larger wavelengths of emitted radiation. As the sensor detects the radiation in a spatially resolved manner, the bank note appears dark to the area of the window.

In Figur 2 ist eine Banknote 10 aus einem Papiersubstrat dargestellt. Die Banknote weist ebenfalls ein Fenster 11 auf. Das Banknotensubstrat weist zwei Papierschichten 12 und 13 auf, welche mit TiO2 als nicht fluoreszierenden Weissmacher ausgestattet sind. Zwischen den beiden Papierschichten 12 und 13 ist eine durchsichtige Polymerschicht 14 eingebettet, in welche UV-Pigmente als Taggants eingebettet sind. Die beiden Papierschichten 12 und 13 weisen im Bereich des Fensters 11 Öffnungen auf, so dass die Polymerschicht 14 sichtbar ist. Fällt UV-Strahlung der UV-Strahlungsquellen 8 auf die Banknote 11 im Bereich des Fensters 11, so wird diese Strahlung absorbiert und eine Strahlung mit einer größeren Wellenlänge als die einfallende Strahlung emittiert. Diese kann durch einen in der Zeichnung nicht dargestellten Sensor nachgewiesen werden. Für diesen Sensor gilt entsprechendes wie für den zu Figur 1 erwähnten Sensor. Die außerhalb des Fensters auf die Banknote 10 treffende UV-Strahlung wird absorbiert, ohne dass eine Reflexion oder Emission stattfindet. Auch bei dieser Banknote weist der Sensor nur im Bereich des Fensters 11 eine Strahlung nach. Darüber hinaus erscheint die Banknote für den Sensor dunkel.In FIG. 2 a banknote 10 is shown from a paper substrate. The banknote also has a window 11. The banknote substrate has two Paper layers 12 and 13, which are equipped with TiO 2 as a non-fluorescent Weissmacher. Between the two paper layers 12 and 13, a transparent polymer layer 14 is embedded, in which UV pigments are embedded as Taggants. The two paper layers 12 and 13 have openings in the region of the window 11, so that the polymer layer 14 is visible. If UV radiation of the UV radiation sources 8 falls on the banknote 11 in the region of the window 11, this radiation is absorbed and emits radiation having a greater wavelength than the incident radiation. This can be detected by a sensor, not shown in the drawing. For this sensor applies as appropriate for the FIG. 1 mentioned sensor. The UV radiation striking the bill 10 outside the window is absorbed without reflection or emission taking place. Even with this banknote, the sensor detects radiation only in the region of the window 11. In addition, the banknote for the sensor appears dark.

In Figur 3 ist ein weiteres Ausführungsbeispiel einer Banknote 15 aus einem Papiersubstrat dargestellt. Dieses Ausführungsbeispiel unterscheidet sich von dem Ausführungsbeispiel gemäß Figur 2 dadurch, dass das Fenster 16 ein halbtransparentes Fenster ist. Lediglich eine der beiden Papierschichten, nämlich die Papierschicht 12, weist eine Öffnung auf. Die zweite Papierschicht 17 der Banknote 15 ist nicht mit einer Öffnung im Bereich des Fensters 16 ausgestattet. In diesem Fall kann die Banknote von zwei Seiten durch Strahlungsquellen 8 bestrahlt werden, um die Unterschiede hinsichtlich des Fensters nachzuweisen. Die UV-Fluoreszenz der Polymerschicht 14 kann nur auf einer Seite der Banknote nachgewiesen werden. In dem das Fenster umgebenden Bereich der Banknote und auf der dem Fenster 16 abgewandten Seite der Banknote 15 ist keine UV-Fluoereszenz nachweisbar, da die Papierschicht TiO2 enthält.In FIG. 3 a further embodiment of a banknote 15 is shown from a paper substrate. This embodiment differs from the embodiment according to FIG FIG. 2 in that the window 16 is a semi-transparent window. Only one of the two paper layers, namely the paper layer 12, has an opening. The second paper layer 17 of the banknote 15 is not provided with an opening in the region of the window 16. In this case, the banknote can be irradiated from two sides by radiation sources 8 in order to detect the differences with respect to the window. The UV fluorescence of the polymer layer 14 can only be detected on one side of the banknote. In the area of the banknote surrounding the window and on the side of the banknote 15 facing away from the window 16, no UV fluorescence can be detected, since the paper layer contains TiO 2 .

Sämtliche Merkmale der Erfindung können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein.All features of the invention may be essential to the invention both individually and in any combination with each other.

Bezugszahlenreference numerals

11
Banknotebill
22
Fensterwindow
33
Polymerschichtpolymer layer
44
Polymerschichtpolymer layer
55
Lamination-SchichtLamination layer
66
Opake SchichtOpaque layer
77
Opake SchichtOpaque layer
88th
UV-StrahlungsquelleUV radiation source
99
1010
Banknotebill
1111
Fensterwindow
1212
Papierschichtpaper layer
1313
Papierschichtpaper layer
1414
Polymerschichtpolymer layer
1515
Banknotebill
1616
Fensterwindow
1717
Papierschichtpaper layer

Claims (11)

Verfahren zur Überprüfung der Echtheit von Banknoten mit mindestens einem ganz oder teilweise durchsichtigen Sicherheitsfenster, wobei die Banknoten (1, 10, 15) aus einem Banknotensubstrat bestehen, welches zumindest eine UV-Strahlung absorbierende, Emission und Reflexion im UV-Wellenlängenbereich im wesentlichen vermeidende Schicht (6, 7, 12, 13, 17) aufweist, und wobei das Sicherheitsfenster (2, 11, 16) eine Substanz aufweist, welche im UV-Wellenlängenbereich fluoresziert, gekennzeichnet durch folgende Verfahrensschritte: Bestrahlen einer Banknote (1, 10, 15) mit einer Strahlung einer Wellenlänge im UV-Bereich des Spektrums, ortsaufgelöstes Erfassen der von der Banknote (1, 10, 15) emittierten Strahlung mittels mindestens eines Sensors, wobei die Empfindlichkeit des Sensors im Bereich der Wellenlänge der anregenden Strahlung kleiner ist als im Bereich der von der Banknote emittierten Strahlung oder wobei die Wellenlänge der anregenden Strahlung außerhalb des Empfindlichkeitsbereichs des Sensors liegt. Method for verifying the authenticity of banknotes having at least one completely or partially transparent security window, wherein the banknotes (1, 10, 15) consist of a banknote substrate, which at least one UV radiation absorbing, emission and reflection in the UV wavelength range substantially avoiding layer (6, 7, 12, 13, 17), and wherein the security window (2, 11, 16) has a substance which fluoresces in the UV wavelength range, characterized by the following method steps: Irradiating a banknote (1, 10, 15) with a radiation of a wavelength in the UV range of the spectrum, location-resolved detection of the radiation emitted by the banknote (1, 10, 15) by means of at least one sensor, wherein the sensitivity of the sensor in the region of the wavelength of the exciting radiation is smaller than in the region of the radiation emitted by the banknote or wherein the wavelength of the exciting radiation outside the sensitivity range of the sensor. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Banknote (1, 10, 15) mit einer Strahlung bestrahlt wird, deren Wellenlänge kleiner als 380 nm ist.A method according to claim 1, characterized in that the banknote (1, 10, 15) is irradiated with a radiation whose wavelength is smaller than 380 nm. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Banknote (1, 10, 15) mit einer Strahlung bestrahlt wird, deren Wellenlänge kleiner als 350 nm ist.A method according to claim 1 or 2, characterized in that the banknote (1, 10, 15) is irradiated with a radiation whose wavelength is less than 350 nm. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass mit dem Sensor nur Strahlung nachgewiesen wird, deren Wellenlänge größer als 380 nm ist.A method according to claim 1, 2 or 3, characterized in that only radiation is detected with the sensor whose wavelength is greater than 380 nm. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die von der gesamten, dem Sensor zugewandten Oberfläche einer Banknote (1, 10, 15) emittierte Strahlung erfasst wird.Method according to one of the preceding claims, characterized in that the radiation emitted by the entire surface of a banknote (1, 10, 15) facing the sensor is detected. Vorrichtung zur Überprüfung der Echtheit von Banknoten mit mindestens einem ganz oder teilweise durchsichtigen Sicherheitsfenster, wobei die Banknoten (1, 10, 15) aus einem Banknotensubstrat bestehen, welches zumindest eine UV-Strahlung absorbierende, Emission und Reflexion im UV-Wellenlängenbereich im wesentlichen vermeidende Schicht (3, 4, 12, 13, 17) aufweist und wobei das Sicherheitsfenster (2, 11, 16) eine Substanz aufweist, welche im UV-Wellenlängenbereich fluoresziert, insbesondere zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sie mit mindestens einer UV-Strahlungsquelle (8) ausgestattet ist, welche eine Banknote mit einer Strahlung einer Wellenlänge oder eines Wellenlängenbereichs des UV-Spektralbereichs bestrahlt, dass sie mit mindestens einem Sensor ausgestattet ist, der ortsaufgelöst die von der Banknote (1, 10, 15) emittierte Strahlung erfasst, und dass die Empfindlichkeit des Sensors im Bereich der Wellenlänge der anregenden Strahlung kleiner ist als im Bereich der von der Banknote emittierten Strahlung oder dass die Wellenlänge der anregenden Strahlung außerhalb des Empfindlichkeitsbereichs des Sensors ist.Device for checking the authenticity of banknotes with at least one completely or partially transparent security window, wherein the banknotes (1, 10, 15) consist of a banknote substrate, which at least one UV radiation absorbing, emission and reflection in the UV wavelength range substantially avoiding layer (3, 4, 12, 13, 17) and wherein the safety window (2, 11, 16) has a substance which fluoresces in the UV wavelength range, in particular for carrying out the method according to one of claims 1 to 5, characterized in that it is equipped with at least one UV radiation source (8) which irradiates a banknote with radiation of a wavelength or a wavelength range of the UV spectral range, that it is equipped with at least one sensor which is spatially resolved by the banknote (1, 10 , 15) detected radiation, and that the sensitivity of the sensor in the wavelength range of the stimulating radiation is smaller than in the area of the radiation emitted by the banknote or that the wavelength of the exciting radiation is outside the sensitivity range of the sensor. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die UV-Strahlungsquelle (8) mehrere nebeneinander in einer Reihe angeordnete UV-LEDs aufweist.Apparatus according to claim 6, characterized in that the UV radiation source (8) has a plurality of juxtaposed in a row UV LEDs. Vorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die Wellenlängen der UV-Strahlungsquelle (8) kleiner als 380 nm sind.Apparatus according to claim 6 or 7, characterized in that the wavelengths of the UV radiation source (8) are smaller than 380 nm. Vorrichtung nach Anspruch 6, 7 oder 8, dadurch gekennzeichnet, dass die Wellenlängen der UV-Strahlungsquelle (8) kleiner als 350 nm sind.Apparatus according to claim 6, 7 or 8, characterized in that the wavelengths of the UV radiation source (8) are smaller than 350 nm. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass der Sensor einen Zeilensensor aufweist, zu dem die Banknoten (1, 10, 15) mit einer Relativgeschwindigkeit bewegt werden.Device according to one of claims 6 to 9, characterized in that the sensor comprises a line sensor, to which the banknotes (1, 10, 15) are moved at a relative speed. Vorrichtung nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, dass die Untergrenze des Empfindlichkeitsbereichs des Sensors 380 nm beträgt.Device according to one of claims 6 to 10, characterized in that the lower limit of the sensitivity range of the sensor is 380 nm.
EP11007877.1A 2010-11-12 2011-09-28 Method and device for assessing the authenticity of bank notes with security windows Active EP2453418B1 (en)

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