EP1265198A2 - Dispositif et méthode pour analyser des documents - Google Patents

Dispositif et méthode pour analyser des documents Download PDF

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Publication number
EP1265198A2
EP1265198A2 EP02008257A EP02008257A EP1265198A2 EP 1265198 A2 EP1265198 A2 EP 1265198A2 EP 02008257 A EP02008257 A EP 02008257A EP 02008257 A EP02008257 A EP 02008257A EP 1265198 A2 EP1265198 A2 EP 1265198A2
Authority
EP
European Patent Office
Prior art keywords
detector
luminescent light
document
light
detector units
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02008257A
Other languages
German (de)
English (en)
Other versions
EP1265198B1 (fr
EP1265198A3 (fr
Inventor
Thomas Dr. Giering
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient GmbH
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Publication date
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP1265198A2 publication Critical patent/EP1265198A2/fr
Publication of EP1265198A3 publication Critical patent/EP1265198A3/fr
Application granted granted Critical
Publication of EP1265198B1 publication Critical patent/EP1265198B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 relates to a device for examining documents, in particular value, ID or security documents, with at least an excitation device for excitation of luminescent light in or on a document to be examined and at least two detector units to capture at least part of what is emitted by the document Luminescence light.
  • the invention also relates to a corresponding one Method.
  • ID, security or Documents of value such as Banknotes, provided with features or with suitable ones
  • Printed security inks which luminescent substances contain. These are substances that e.g. by light, electric fields, Radiation or sound can be excited to emit light.
  • the authenticity check usually includes the documents to be checked Illuminated light of a certain spectral range and that of the luminescent Substances of the document emitted luminescent light are detected. Based on the intensity and / or spectral characteristics of the emitted Luminescent light can then be determined if the document is genuine or is fake.
  • the reliability of statements about the authenticity of the checked documents is particularly dependent on the accuracy with which is the spectral characteristic, i.e. the color of the luminescent light is analyzed.
  • Such an analysis can be done, for example, by spectrometers take place, which, however, a relatively high technical effort as well require high manufacturing costs. Therefore provide a simpler solution individual detector units, e.g. Photodiodes or photomultipliers, with different spectral sensitivity.
  • the detector units deliver different Detector signals, which are then used for the spectral analysis of the luminescent light can be used.
  • the invention is based on the idea that the detector units are related on the direction of that emitted by the document and on the detector units striking luminescent light are arranged one behind the other. As a result, the luminescent light strikes one after the other arranged detector units and is detected by them.
  • the arrangement of the detector units according to the invention ensures that that all detector units arranged directly one behind the other emitted from a common spatial portion of the document Can capture luminescent light. Any parallax errors that occur with a laterally offset arrangement of detector units would occur, are arranged one behind the other by the arrangement of the detector units according to the invention greatly reduced. From those of the individual detector units Spectral components of the luminescent light recorded can then make statements about the luminescent properties of the document with high reliability be derived.
  • At least one first detector unit for that spectral subrange of the luminescent light is permeable, which with at least one behind the second detector unit arranged in the first detector unit shall be.
  • the first detector unit then becomes a first spectral one Part of the luminescent light is captured, while a second spectral Part of the luminescent light pass through the first detector unit can and detected by the second detector unit arranged behind it becomes.
  • the first detector unit acts like an optical filter in front of the second detector unit behind. For certain applications it is therefore usually possible to dispense with additional optical filters.
  • the detector units are preferably photodiodes, which are arranged in layers on top of each other and a so-called Form a sandwich diode. This creates a very compact arrangement of the Detector units reached.
  • the detector units can also be elements which light using other physical detection principles, e.g. using the avalanche effect.
  • the photodiodes or p-n junctions preferably have different ones Absorptionskanten, wherein the absorption edge at least a first Photodiode or a first p-n junction at smaller wavelengths is at least one behind the first photodiode as the absorption edge arranged second photodiode or one behind the first p-n junction arranged second p-n junction.
  • a particularly simple and reliable derivation of statements about the spectral properties of the detected luminescent light from those of the Detector signals generated on the basis of individual detector units can a division of two detector signals and / or the difference of two logarithmic detector signals.
  • Fig. 1 shows a preferred structure of the device according to the invention.
  • a document to be examined in the example shown a bank note 10, is indicated by means of transport rollers 40 and transport belts 41 Transport device transported past the sensor system 7.
  • the bank note 10 with the excitation light 15 of the light sources 12 irradiated.
  • the light sources 12 are, for example, fluorescent tubes, Incandescent lamps, lasers or LEDs, which each emit light, that is suitable for the excitation of luminescent light in or on the bank note 10 is.
  • the excitation light 15 is preferably ultraviolet (UV light.
  • UV light ultraviolet
  • luminescent light 16 in is excited or on the document by the light 15 of the light sources 12.
  • a corresponding one Luminescence is therefore referred to as photoluminescence.
  • it can also be by electromagnetic or electric fields, radiation or sound other types of luminescence phenomena, such as.
  • Excitation devices e.g. electrical contacts or field plates, Radiation sources for cathode, ion or x-rays, Ultrasound sources or antennas.
  • the excitation light 15 emitted by the respective light sources 12 at different Wavelengths or wavelength ranges. That with different Wavelengths or wavelength ranges of excited luminescent light 16 leaves even more precise statements about the luminescent properties the banknote 10 too.
  • the Light sources 12 illuminate the banknote 10 either individually or in combination and this with individually or combined illuminated banknote 10 detected luminescent light 16 is evaluated. Will be in the example shown 1 first illuminated with only one light source 12, then detect the two detector units 1 and 2 a first pair of intensity values. Subsequent illumination with the other light source 12 generates a second pair of intensity values. With simultaneous lighting with Finally, a third pair of intensity values is obtained for both light sources 12. By comparing and / or arithmetically linking the here received, i.a. different, intensity values will be a particularly accurate Examination of the luminescent properties of the examined banknote 10 reached.
  • the device or the method is suitable for examination of phosphorescent and fluorescent light alike.
  • the luminescent light 16 excited in or on the bank note 10 is emitted by the banknote 10 emits and strikes two detector units 1 and 2, which according to the invention are arranged one behind the other that the the bank note 10 outgoing luminescent light 16 successively on the individual Detector units 1 and 2 meet and are detected by them can.
  • the two detector units 1 and 2 each have different ones spectral sensitivities so that each has a different spectral component of the luminescent light 16 is detected. Accordingly differ the detector signals S generated by the detector units 1 and 2, which can be fed to an evaluation device 9 for evaluation and analysis.
  • an optical device 13 which the luminescent light 16 emitted by the bank note 10 onto the detector units 1 and 2 steers, especially focused. It is preferably This is an imaging optic which covers a partial area 11 of the Banknote 10 maps to the detector units 1 and 2.
  • Selfoc lenses the distance between the Banknote 10 and the detector units 1 and 2 independent and adjustment-free 1: 1 image of the portion 11 of the bank note 10 to be examined reached on the detector units 1 and 2.
  • a filter 14 is arranged in front of the detector units 1 and 2, which for those spectral subregions of the luminescent light 16 is permeable, which detects with the detection units 1 and 2 should be.
  • the individual detector units are as photodiodes 1 and 2 formed and related to the direction of the Document emitted luminescent light 16 arranged one behind the other.
  • the individual photodiodes 1 and 2 each have a p-n junction 3/4 or 5/6 between a p-doped 3 or 5 and an n-doped 4 or 6 semiconductor layer.
  • the doping profile is greatly simplified shown and generally gives not the actual proportions of the Layer thicknesses again.
  • There are spacers between the photodiodes 1 and 2 8 provided to avoid electrical short circuits.
  • the height of the spacers should 8 should not be chosen too large and in the order of magnitude Height of the photodiodes 1 and 2 are.
  • a filter 14 in front of the photodiode 1 be arranged.
  • FIGS. 3a and 3b each show a second embodiment of the invention Arrangement shown.
  • FIG. 3a shows a component 20 which the detector units 1 and 2 are integrated together, wherein component 20 has two p-n junctions 22/21 and 23/21, respectively each correspond to a detector unit 1 or 2.
  • the n-doped semiconductor layer 21 here forms the substrate on which the two p-n junctions 22/21 or 23/21 are applied in layers.
  • the doping profile is here also shown in a very simplified form and generally gives not the actual Ratios of the layer thicknesses again. Analogous to that in figure 2 example shown here are voltages with suitable connections 17 tapped and as detector signals S to an evaluation unit (not shown).
  • Figure 3b shows a variant of the second embodiment of the invention Arrangement.
  • the component 30 shown comprises two layers trained p-n junctions 32/33 and 34/33, which on a common Substrate 31 are applied.
  • the substrate 31 itself can be a Semiconductor or ceramic substrate. In terms of how this works The explanations for FIG. 3a apply analogously to the embodiment.
  • the detector units 1 and 2 shown in FIGS. 2, 3a and 3b are chosen so that the first detector unit 1 for that spectral sub-range of the luminescent light 16 is transparent, which with the behind the first detector unit 1 arranged second detector unit 2 can be detected should.
  • Detector units 1 and 2 have different absorption edges on, wherein the absorption edge of the first photodiode 1 and first p-n transition 3/4, 32/33 or 22/21 at smaller wavelengths lies as the second absorption edge behind the first photodiode 1 or the first p-n transition 3/4, 32/33 or 22/21 arranged second Photodiode 2 or second p-n junction 5 / 6.34 / 33 or 23/21.
  • Detector units 1 and 2 one above the other become the respective p-n junctions 3/4 or 5/6 preferably on different semiconductor materials realized.
  • a photodiode based on silicon (Si) and for the second detector unit 2 a photodiode based on germanium (Ge) is used.
  • wavelength below about a micron can then be from the photodiode 1 can be detected on the basis of silicon during wavelengths penetrate this photodiode 1 above about a micrometer and from the photodiode 2 arranged behind it on the basis of Germanium can be detected.
  • photodiodes can be used based on silicon and indium gallium arsenide (InGaAs) or silicon and lead sulfide (PbS) can be combined to make the luminescent light 16 to be detected in two different spectral subregions.
  • InGaAs indium gallium arsenide
  • PbS lead sulfide
  • B. the combination of several corresponding photodiodes possible, e.g. B. from silicon, indium gallium arsenide and lead sulfide.
  • FIGS. 3a and 3b Arrangement is the different permeability or sensitivity of the detector units 1 and 2 by selecting suitable ones Semiconductor materials and / or a corresponding doping of the respective material reached.
  • a corresponding component 20 or 30 leaves can be realized, for example, on the basis of silicon, the first p-n junction 22/21 or 32/33 due to a lower penetration depth for short-wave Light is particularly sensitive. However, long-wave light can penetrate deeper into the layer system and of the stronger in the long-wave Spectral range sensitive second p-n transition 23/21 and 34/33 detected become.
  • FIG. 4 shows an example for different spectral sensitivities E. of the detector units 1 and 2 shown in FIGS. 2 and 3 can be seen from the diagram, the spectral sensitivity E1 is the first detector unit 1 in the region of short wavelengths ⁇ , while the spectral sensitivity E2 behind the first detector unit 1 arranged second detector unit 2 at higher wavelengths ⁇ their Maximum reached.
  • the respective behavior is complementary to this spectral permeability of the detector units 1 and 2.
  • the spectral The transmittance of the detector unit 1 is accordingly at higher wavelengths ⁇ greatest, so that the luminescent light in this partial area of the Spectrum can penetrate the detector unit 1 and finally by the Detector unit 2 can be detected.
  • Figure 5 shows a circuit diagram of the second shown in Figures 3a and 3b Embodiments.
  • Detector units 1 and 2 i.e. the corresponding p-n junctions 22/21 and 23/21 or 32/33 and 34/33, of the component 20 and 30 are oppositely connected in series photodiodes shown, the cathodes of a common potential 18th lie.
  • the signals S1 and S2 fed to an evaluation device 9.
  • the signals S1 and S2 are each in a logarithmic amplifier 28 logarithmically amplified and then to a differential amplifier 29 laid.
  • the spectral properties of the lunimescent light 16, in particular the Wavelength, e.g. the central wavelength, and / or the wavelength range and / or the color can not only be visible according to the invention Spectral range, but also in invisible spectral ranges, such as e.g. in the infrared or ultraviolet, can be detected and analyzed.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
EP02008257.4A 2001-06-08 2002-04-19 Dispositif et méthode pour analyser des documents Expired - Lifetime EP1265198B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10127837A DE10127837A1 (de) 2001-06-08 2001-06-08 Vorrichtung und Verfahren zur Untersuchung von Dokumenten
DE10127837 2001-06-08

Publications (3)

Publication Number Publication Date
EP1265198A2 true EP1265198A2 (fr) 2002-12-11
EP1265198A3 EP1265198A3 (fr) 2005-01-12
EP1265198B1 EP1265198B1 (fr) 2019-10-30

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EP02008257.4A Expired - Lifetime EP1265198B1 (fr) 2001-06-08 2002-04-19 Dispositif et méthode pour analyser des documents

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US (1) US6777704B2 (fr)
EP (1) EP1265198B1 (fr)
DE (1) DE10127837A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004104947A2 (fr) * 2003-05-23 2004-12-02 Giesecke & Devrient Gmbh Dispositif de verification de billets de banque

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004035494A1 (de) 2004-07-22 2006-02-09 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Prüfung von Wertdokumenten
AU2012203003B2 (en) * 2004-07-22 2013-04-11 Giesecke+Devrient Currency Technology Gmbh Device and method for verifying value documents
DE102004039049A1 (de) * 2004-08-11 2006-02-23 Giesecke & Devrient Gmbh Verfahren und Vorrichtung zum Messen von Blattgut
US8263948B2 (en) * 2009-11-23 2012-09-11 Honeywell International Inc. Authentication apparatus for moving value documents
EP2517064A2 (fr) * 2009-12-22 2012-10-31 Miao Zhang Procédés et systèmes d'éclairage pour optimiser la résolution d'image de systèmes imageurs
DE102010047061A1 (de) * 2010-09-30 2012-04-05 Carl Zeiss Microlmaging Gmbh Optisches Weitbereichsspektrometer
WO2012167894A1 (fr) * 2011-06-06 2012-12-13 Sicpa Holding Sa Dispositif de balayage de temps d'affaiblissement en ligne
DE102011106523A1 (de) * 2011-07-04 2013-01-10 Giesecke & Devrient Gmbh Prüfgerät und Verfahren zur Kalibrierung eines Prüfgeräts
US10452908B1 (en) 2016-12-23 2019-10-22 Wells Fargo Bank, N.A. Document fraud detection
CN110537092A (zh) 2017-03-27 2019-12-03 光荣株式会社 光传感器、光检测装置、纸张处理装置、光检测方法及磷光检测装置
DE102018109141A1 (de) * 2018-04-17 2019-10-17 Bundesdruckerei Gmbh Smartphone verifizierbares, leuchtstoffbasiertes Sicherheitsmerkmal und Anordnung zur VerifizierungSmartphone verifizierbares, leuchtstoffbasiertes Sicherheitsmerkmal und Anordnung zur Verifizierung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0083062A2 (fr) * 1981-12-24 1983-07-06 Kabushiki Kaisha Toshiba Dispositif de vérification de feuilles imprimées
US4677289A (en) * 1984-11-12 1987-06-30 Kabushiki Kaisha Toshiba Color sensor
EP0716538A2 (fr) * 1994-12-06 1996-06-12 Canon Kabushiki Kaisha Dispositif de prise d'image
US5965875A (en) * 1998-04-24 1999-10-12 Foveon, Inc. Color separation in an active pixel cell imaging array using a triple-well structure
WO2000077861A1 (fr) * 1999-06-14 2000-12-21 Augusto Carlos J R P Composant optoelectronique presentant un empilement de couches et une caracteristique de selection de longueurs d'ondes
WO2001061654A2 (fr) * 2000-02-21 2001-08-23 Giesecke & Devrient Gmbh Procede et dispositifs pour le controle d'authenticite d'objets imprimes

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9717194D0 (en) * 1997-08-13 1997-10-22 De La Rue Thomas & Co Ltd Detector methods and apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0083062A2 (fr) * 1981-12-24 1983-07-06 Kabushiki Kaisha Toshiba Dispositif de vérification de feuilles imprimées
US4677289A (en) * 1984-11-12 1987-06-30 Kabushiki Kaisha Toshiba Color sensor
EP0716538A2 (fr) * 1994-12-06 1996-06-12 Canon Kabushiki Kaisha Dispositif de prise d'image
US5965875A (en) * 1998-04-24 1999-10-12 Foveon, Inc. Color separation in an active pixel cell imaging array using a triple-well structure
WO2000077861A1 (fr) * 1999-06-14 2000-12-21 Augusto Carlos J R P Composant optoelectronique presentant un empilement de couches et une caracteristique de selection de longueurs d'ondes
WO2001061654A2 (fr) * 2000-02-21 2001-08-23 Giesecke & Devrient Gmbh Procede et dispositifs pour le controle d'authenticite d'objets imprimes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004104947A2 (fr) * 2003-05-23 2004-12-02 Giesecke & Devrient Gmbh Dispositif de verification de billets de banque
DE10323410A1 (de) * 2003-05-23 2004-12-09 Giesecke & Devrient Gmbh Vorrichtung zur Prüfung von Banknoten
WO2004104947A3 (fr) * 2003-05-23 2005-01-06 Giesecke & Devrient Gmbh Dispositif de verification de billets de banque
US7504632B2 (en) 2003-05-23 2009-03-17 Giesecke & Devrient Gmbh Apparatus for checking banknotes

Also Published As

Publication number Publication date
US6777704B2 (en) 2004-08-17
US20020185615A1 (en) 2002-12-12
DE10127837A1 (de) 2003-01-23
EP1265198B1 (fr) 2019-10-30
EP1265198A3 (fr) 2005-01-12

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