EP1321904B2 - Vorrichtung zur Erfassung von optischen Eigenschaften eines Geldscheins - Google Patents

Vorrichtung zur Erfassung von optischen Eigenschaften eines Geldscheins Download PDF

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Publication number
EP1321904B2
EP1321904B2 EP02258600.2A EP02258600A EP1321904B2 EP 1321904 B2 EP1321904 B2 EP 1321904B2 EP 02258600 A EP02258600 A EP 02258600A EP 1321904 B2 EP1321904 B2 EP 1321904B2
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EP
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Prior art keywords
banknote
transmitter
light
path
receiver
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Expired - Lifetime
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EP02258600.2A
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English (en)
French (fr)
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EP1321904B1 (de
EP1321904A1 (de
Inventor
Christian Voser
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Crane Payment Innovations Inc
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Crane Payment Innovations Inc
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Priority claimed from EP01310680A external-priority patent/EP1321903A1/de
Application filed by Crane Payment Innovations Inc filed Critical Crane Payment Innovations Inc
Priority to EP02258600.2A priority Critical patent/EP1321904B2/de
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Publication of EP1321904B1 publication Critical patent/EP1321904B1/de
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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
    • G07D7/121—Apparatus characterised by sensor details

Definitions

  • This invention relates to an apparatus for sensing optical characteristics of a banknote.
  • Such apparatus is commonly used to determine the authenticity and denomination of banknotes. Often, a banknote is moved along a path past optical transmitters and receivers so that the transmission or reflection characteristics in respective areas of the banknote can be determined by scanning.
  • the apparatus may include transmitters which operate in multiple wavelengths, such as red, green, blue and infra-red. (It is noted that the terms “optical” and “light” are used herein to refer to any electromagnetic wavelength, and not merely visible wavelengths.)
  • EP-A-0 537 513 relates to a device for measuring banknotes which includes rows of LEDs situated below and above a banknote to be measured.
  • a CCD sensor is arranged to detect both diffusely reflected and refracted light from the banknote.
  • EP-A-0 718 809 relates to a device for characterising banknotes which includes two light sources, one arranged on each side of a banknote and means for detecting light which is both reflected and transmitted by the banknote.
  • US-A-6061121 discloses a banknote processor which includes an illumination device for continually illuminating a sheet to be tested and a receiving device for receiving reflected and filtered light, both devices preferably being arranged along an axis perpendicular to the sheet.
  • the illumination device emits divergent light which is reflected on its path to the sheet by various mirrors to increase the uniformity of illumination.
  • the present invention relates to an apparatus as set out in claim 1.
  • a receiver is arranged to receive both light transmitted through the banknote and light reflected from the banknote. Accordingly, the reflection and transmission characteristics of the banknote can be measured in a simple and economic manner.
  • the receiver is located in proximity to a transmitter which transmits the light which is reflected by the banknote to the receiver.
  • the arrangement is such that the receiver receives light which is diffusely reflected by the banknote, because this provides a much more representative measurement of the optical characteristics of the banknote than directly reflected light.
  • the light paths to and from the banknote are arranged to be inclined with respect to the normal to the plane of the banknote. Because the receiver and transmitter are in proximity, and possibly mounted on the same circuit board, it is easier to make the apparatus more compact.
  • a light transmitter and a light receiver are arranged on the same side of the path of a banknote, the receiver being arranged to receive light diffusely reflected by the banknote and travelling in a direction which is substantially opposite to that of the light transmitted by the transmitter. Direct reflection is avoided by arranging for the light paths to be inclined with respect to the normal to the banknote and, preferably, by the light incident on the banknote being collimated so that it does not diverge when considered in at least one plane containing the normal to the banknote.
  • the banknote is moved in the scanning direction relative to the incident light and the light is collimated so that it does not diverge when considered in a plane containing both the scanning direction and the normal to the plane of the banknote.
  • the incident light is arranged to diverge when viewed in a plane which contains the normal to the banknote and which is transverse to the scanning direction, so that a single transmitter can be used to illuminate a relatively wide area of the banknote as the banknote is moved in the scanning direction past the transmitter.
  • each transmitter is associated with at least two receivers, which could be mounted on opposite sides of the transmitter (displaced in a direction transverse to both the scanning direction and the direction normal to the plane of the banknote) for receiving light from respective areas of the banknote.
  • the apparatus for measuring the optical characteristics of a banknote includes a reference body and means for moving the body from a first position within the apparatus but out of a banknote path to a second position, possibly within the banknote path, between an optical transmitter and an optical receiver, thereby to permit calibration by measuring the transmission and/or reflection characteristics of the reference body.
  • the reference body is used for calibrating the measurement of both transmittance and reflectance characteristics.
  • a control means is arranged automatically to move the reference body to the second position in response to particular conditions, for example each time a transaction has been completed using a banknote validator incorporating the apparatus of the invention.
  • a banknote 2 lies in a plane P1.
  • drive means are provided for conveying the banknote 2 in a scanning direction S which preferably lies in the plane P1 and more preferably is parallel to the length of the banknote 2.
  • the direction shown at T is transverse, and particularly perpendicular, to the scanning direction S and also lies within the plane P1 of the banknote 2.
  • the direction which is normal to the banknote 2 is shown at N.
  • the apparatus includes a first optical device 3 including a light transmitter 4 which is arranged to transmit light to the banknote 2 along a path which is parallel to a plane P2.
  • the plane P2 contains the transverse direction T and is located at an angle, for example about 20°, to the normal direction N.
  • the device 3 also includes two light receivers 6, 7 positioned in close proximity to, and on respective sides of, the transmitter 4 and displaced from each other in the transverse direction T.
  • any light which is reflected from the banknote back in the direction which is substantially reverse to the direction of the transmitted light will be received by the receivers 6, 7 located near the transmitter 4. This will be diffusely reflected light. Any directly (i.e. specularly) reflected light will travel in a direction 8 away from the transmitter 4 and the receivers 6, 7.
  • the receivers 6 and 7 are arranged to receive, in addition to light from the transmitter 4 reflected by the banknote, light from the transmitter 4' transmitted through the banknote.
  • the receivers 6', 7' can receive light from the transmitter 4 which has been transmitted through the banknote 2. Accordingly, each of the receivers 6, 6', 7, 7' can be used to detect both the reflectance and transmission characteristics of the banknote 2.
  • Figure 2 is a side view of the devices 3, 3', the plane of the drawing corresponding to a plane P3 ( Figure 1 ) containing both the scanning direction S and the normal N.
  • the light from the transmitter 4 forms a beam which illuminates an area 10 of the banknote.
  • a lens 12 (see also Figure 3 ) collimates the light so that there is substantially no divergence of the beam when viewed in the plane P3. Accordingly, all the directly reflected light travelling in the direction 8 will avoid the receivers 6, 7.
  • the plane of the drawing corresponds to a plane P4 ( Figures 1 and 2 ) containing both the transverse direction T and the normal N.
  • a lens 14, having a skewed optic axis focuses approximately half the area 10, indicated at 10', on to the receiver 6.
  • a lens 15, also having a skewed optic axis focuses the other half of the area 10, indicated at 10", on to the receiver 7.
  • the arrangement is symmetrical about the optic axis 16 of the transmitter 4.
  • a single transmitter 4 is used to illuminate the areas sensed by two separate receivers 6, 7, thus reducing the number of transmitters required. Furthermore, because the light diverges in the planes P2, P4 containing the transverse direction T, but not in the plane P3 containing the scanning direction S, a relatively large area can be illuminated while still avoiding the sensing of direct reflection by the receivers 6, 7.
  • the light from the transmitter 4 incident on the banknote and the light from the banknote to the receivers 6, 7 travel in opposite directions in substantially the same path, the small path difference being as a result of the fact that the physical sizes of the transmitter and receivers cause a small angle to be subtended between the light paths at the banknote.
  • FIG. 4 illustrates a banknote validator 20 in accordance with the invention.
  • the validator has an inlet 22 arranged to receive banknotes which travel along a path 24 to an apparatus 30 which is arranged to test the optical transmission and reflectance characteristics of the banknote.
  • a control means 26 is arranged to send signals to and receive signals from the apparatus 30 and to use the received signals to determine the authenticity and the denomination of the banknote.
  • the control means 26 is also arranged to send control signals to the apparatus 30 to perform a calibration operation, as will be described below.
  • the banknote travels from the apparatus 30 to a gate 28 which is controlled by the control means 26 in dependence upon the type of banknote received.
  • the gate can direct the banknote either to a path 32 leading to an outlet 34, or to a path 36 leading to a banknote store 38.
  • the apparatus 30 for sensing the optical characteristics of banknotes is shown in more detail in the perspective view of Figure 5 .
  • Banknotes are conveyed in the scanning direction S by means of endless belts 40 and sets of rollers 42 at the inlet side 44 of the apparatus and endless belts 46 and sets of rollers 48 at the outlet side 50 of the apparatus.
  • the belts 40 and rollers 42 at the inlet side 44 of the apparatus are disposed laterally between the belts 46 and rollers 48 at the outlet side 50 of the apparatus.
  • the optical devices 3 (which are identical to the devices 3') are arranged in modules, or units.
  • a first unit 52 is disposed above the banknote path at the inlet side 44, and faces a second unit 54 below the banknote path.
  • Each unit comprises four optical devices 3 arranged in a line extending in the transverse direction T, each device comprising a transmitter 4 and a pair of receivers 6, 7 arranged as shown in Figures 2 and 3 to sense the reflectance and transmission characteristics in a pair of adjacent areas 10', 10" of the banknotes.
  • the units 52 and 54 are arranged for sensing the reflectance and transmittance characteristics of the banknotes in scanned areas which extend between the inlet belts 40.
  • Two further units, 56 and 58 are disposed respectively above and below the banknote path at the outlet side 50. These are of similar structure and orientation to the modules 52 and 54, except that they are arranged to scan the areas between the outlet belts 46. Accordingly, as indicated in the plan view of Figure 6 , the units 52, 54, 56 and 58 can scan the entire width of the banknote, each pair of units scanning areas between the areas scanned by the other pair.
  • the transmitter 4 and the receivers 6 and 7 are mounted on a common circuit board. If desired, a single circuit board can be used for all the devices 3 within a single module.
  • each transmitter comprises an LED package which includes a plurality of dies each of a respective wavelength, for example red, green, blue and infra-red.
  • FIG. 5 also shows a pair of calibration units 60, 62.
  • Each unit carries four reference bodies 64 and is mounted for pivotal movement about an axis parallel to the transverse direction T so that the body can be pivoted from a non-operational position, as shown in Figure 5 , to an operational position in which each reference body 64 is located between an optical device 3 of one of the units (52 or 56) and the corresponding optical device 3 in another of the units (54 or 58).
  • the reference body In this position, the reference body is located in or near the banknote path, and is operable to transmit light from the transmitter 4 of one of the devices to the receivers 6,7 of the opposed device, and to reflect light from the transmitter 4 to its adjacent receivers 6,7.
  • Each reference body has predetermined reflection and transmission characteristics, so that calibration of the apparatus can be performed by taking reflectance and transmission measurements while the reference members 60, 62 are in their operational positions.
  • the operation of the validator 20 of Figure 4 is as follows.
  • a received banknote is delivered to the inlet side 44 of the apparatus 30.
  • the reference members 60, 62 are in their non-operational positions at this time.
  • the control means 26 continuously checks the light transmitted between the optical units 52, 54 in the inlet section 44 until it detects the significant change caused by the leading edge of the banknote. Further movement of the banknote in the scanning direction S is tracked using an encoder so that the subsequent transmission and reflectance measurements can be associated with respective positions on the banknote.
  • the arrangement is such that: (a) dies of different wavelengths are not energised at the same time, (b) reflectance measurements made by each receiver take place when the opposed transmitter on the other side of the banknote path is de-energised, and (c) transmission measurements made by each receiver take place when its adjacent transmitter is de-energised.
  • the measurements are initially carried out using the units 52, 54, but similar measurements are also carried out by the units 56, 58 when the leading edge of the banknote has reached these units, as determined by the output of the encoder.
  • control means 26 moves the reference members 60, 62 to their operational positions and takes both transmission and reflection calibration measurements which are used to adjust the power supply to the dies of respective wavelengths so that the intensities of the outputs as measured by the receivers complies with a predetermined level, adjust the sensitivities of the receivers and/or alter the processing of the receiver outputs to achieve calibration of the apparatus.
  • the calibration operation may be performed only at the end of the transaction which may involve the measurement of one or more banknotes.
  • the reference members 60, 62 could be replaced by a sheet, made of for example plastics material, with predetermined reflection and/or transmission characteristics.
  • This sheet could be fed along the banknote path, using the normal banknote feeding mechanism, and stored within the banknote apparatus, for example using a dedicated sheet store, so that the reference sheet can be discharged from the store to perform a calibration operation and then returned to the store.
  • a cleaning means such as a brush may be provided so that each reference body or the reference sheet is cleaned as it is moved to or from the position in which calibration takes place.
  • a modified embodiment could therefore be constructed as shown in Figure 7 .
  • This is similar to Figure 2 , except for the provision of additional sensors 9, 9' and focussing lenses 19, 19' for focussing directly-reflected light onto these sensors.
  • directly-reflected light By additionally measuring directly-reflected light, it is possible to sense the state of the surface of the banknote. This could be useful for detecting, for example, shiny areas caused by metal strips incorporated into the banknote or by adhesive tape on the banknote. Additionally, or alternatively, the paper quality or texture could be sensed, for example to test the fitness of the banknote to determine whether it should be dispensed.
  • the directly-reflected light could also, or alternatively, be used (possibly in combination with a diffuse-reflection measurement) to distinguish between intaglio-printed ink and ink of uniform thickness.
  • the provision of sensors for detecting reflected light at different angles i.e. the diffuse-reflectivity sensors 6,7 and the direct-reflectivity sensor 9) could also be useful in detecting optically-variable ink.
  • Figure 8 shows another embodiment of the invention, similar to Figure 5 .
  • the features described with respect to Figure 5 also apply to the embodiment of Figure 8 , and like reference numbers represent like parts, except as indicated below.
  • Figure 8 is shown in a different orientation from that of Figure 5 , incorporates sensors for receiving directly-reflected light and additionally has a modified structure as compared with the arrangement of Figure 5 in order to make it more compact and easier to assemble.
  • the transmiters of the optical units 52 and 56 above the banknote path produce light paths which form an obtuse angle with respect to the direction of movement of the banknote; the transmitters of units 54 and 58 produce light paths which form an acute angle with respect to this direction.
  • the banknote path is bent and the angles formed by the light paths of the transmitters at the input side are opposite to the angles formed by the corresponding light paths at the output side.
  • the transmitters of unit 52 on the left of the path at the inlet side produce light paths L52 which form an obtuse angle with respect to the direction S' of movement of the banknote, whereas the transmitters of the left unit 56 at the outlet produce light paths L56 which form an acute angle with respect to the direction S" of movement.
  • the inlet unit 54 uses light paths L54 which are acute with respect to direction S' and the outlet unit 58 uses light paths L58 which are obtuse with respect to direction S".
  • the direct-reflection light paths are shown in broken lines, with one of the direct-reflection sensors being shown at 9.

Claims (16)

  1. Vorrichtung zur Erfassung von optischen Eigenschaften eines Geldscheins, wobei die Vorrichtung mindestens einen ersten optischen Sender (4), der sich auf einer Seite eines Pfades, entlang dem ein Geldschein (2) in einer Abtastrichtung (S) in der Ebene (P1) des Geldscheins bewegt werden kann, um den Geldschein (2) durch Aussenden von Licht in einer Richtung, die in Bezug auf die Normale (N) der Ebene (P1) des Geldscheins (2) geneigt ist, zu beleuchten, befindet, und mindestens einen ersten optischen Empfänger (6;7), zum Empfangen von Licht, das vom Geldschein diffus reflektiert wird, umfasst, wobei sich der erste optische Empfänger (6; 7) neben dem ersten optischen Sender (4) befindet, dadurch gekennzeichnet, dass:
    der erste Sender (4) so angeordnet ist, dass das Licht davon parallel zu einer Erfassungsebene (P2) läuft, die eine Richtung (T) beinhaltet, die im Wesentlichen rechtwinklig zu sowohl der Abtastrichtung (S) als auch der Normalen (N) der Ebene (P1) des Geldscheins ist, wobei sich die Erfassungsebene (P2) in einem Winkel zu der Normalen (N) der Ebene (P1) des Geldscheins befindet;
    wobei der erste Empfänger (6;7) angeordnet ist, Licht von dem ersten Sender (4) zu empfangen, das durch den Geldschein reflektiert wurde und das auch in der Erfassungsebene (P2) auf im Wesentlichen demselben Pfad läuft, aber in entgegengesetzter Richtung des Lichtes, das durch den Sender (4) ausgesendet wird, wobei die kleine Pfaddifferenz infolge der Tatsache auftritt, dass die physischen Größen des Senders und Empfängers verursachen, dass ein kleiner Winkel zwischen den Lichtpfaden am Geldschein eingeschlossen wird.
  2. Vorrichtung nach Anspruch 1, weiter umfassend einen zweiten optischen Sender (4') auf der anderen Seite des Geldscheinpfades zu dem ersten optischen Sender (4), wobei der erste Empfänger (6;7) angeordnet ist, um Licht zu erfassen, das von dem zweiten Sender (4') über den Geldschein (2) ausgesendet wird.
  3. Vorrichtung nach Anspruch 1, beinhaltend einen zweiten optischen Empfänger (6';7'), angeordnet, um Licht zu erfassen, das von dem zweiten Sender (4') ausgesendet und durch den Geldschein (2) diffus reflektiert wird.
  4. Vorrichtung nach Anspruch 3, wobei der zweite Empfänger (6';7') angeordnet ist, um Licht zu erfassen, das von dem ersten Sender (4) über den Geldschein (2) ausgesendet wird.
  5. Vorrichtung nach Anspruch 1, wobei das Licht von dem ersten Sender (4) auseinander läuft, während es zu dem Geldschein läuft, wenn in der Erfassungsebene (P2) gesehen, um eine Fläche zu beleuchten, die länglich ist und sich in einer Richtung (T) erstreckt, die quer zu der Abtastrichtung (S) ist.
  6. Vorrichtung nach Anspruch 5, beinhaltend erste und zweite Lichtempfänger (6,7), die sich beide auf der einen Seite des Pfades befinden, wobei jeder Lichtempfänger (6,7) angeordnet ist, um Licht von dem ersten Sender (4) zu empfangen, das von einer Fläche (10',10") des Geldscheins diffus reflektiert wurde, wobei die Flächen (10',10"), von denen die ersten und zweiten Empfänger (6,7) Licht empfangen, in einer Richtung (T), die quer zu der Abtastrichtung (S) verläuft, versetzt sind.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, beinhaltend Kollimierungsmittel, um das Licht des ersten Senders (4) davon abzuhalten, auseinander zu laufen, wenn in einer Ebene (P3) gesehen, die die Abtastrichtung (S) und die Normale (N) zur Ebene (P1) des Geldscheins (2) enthält.
  8. Vorrichtung nach einem der vorhergehenden Ansprüche, beinhaltend einen weiteren optischen Empfänger (9), angeordnet, um Licht zu erfassen, das von dem ersten Sender (4) ausgesendet und von dem Geldschein (2) spiegelnd reflektiert wird.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei der erste Sender und der erste Empfänger auf einer gemeinsamen Platine befestigt sind.
  10. Vorrichtung nach einem der vorhergehenden Ansprüche, beinhaltend eine Menge von Vorrichtungen (3), jede umfassend einen entsprechenden ersten Empfänger (6;7) und einen entsprechenden ersten Sender (4), wobei jede Vorrichtung (3) dadurch angeordnet ist, um eine entsprechende Fläche von einer Seite des Geldscheins (2) abzutasten, wobei die Flächen zueinander in einer Richtung (T) quer zur Abtastrichtung (S) versetzt sind.
  11. Vorrichtung nach Anspruch 10, beinhaltend eine weitere Menge von Vorrichtungen zum Abtasten von Flächen der einen Seite, wobei jede der Flächen sich zwischen Flächen befindet, die von der ersten Menge von Vorrichtungen abgetastet werden.
  12. Vorrichtung nach Anspruch 11, wobei die entsprechenden Mengen von Vorrichtungen nacheinander entlang einem Geldscheinpfad angeordnet sind, wobei eine Menge von Vorrichtungen neben einem ersten Teil des Geldscheinpfades ist und einen Lichtpfad auf den Geldschein in einem ersten Winkel in Bezug auf die Bewegungsrichtung des Geldscheins definiert und die andere Menge von Vorrichtungen neben einem zweiten Teil des Geldscheinpfades ist und einen Lichtpfad auf den Geldschein in einem zweiten Winkel in Bezug auf die Bewegungsrichtung definiert, wobei die ersten und zweiten Geldscheinpfadteile in Bezug aufeinander geneigt sind, wobei einer des ersten und zweiten Winkels spitz und der andere des ersten und zweiten Winkels stumpf ist.
  13. Vorrichtung nach einem der Ansprüche 10 bis 12, beinhaltend eine weitere Menge von Vorrichtungen zum Abtasten von Flächen der gegenüberliegenden Seite des Geldscheins.
  14. Vorrichtung nach einem der vorhergehenden Ansprüche, weiter beinhaltend einen Referenzkörper (64) und Mittel zum Bewegen des Referenzkörpers zwischen einer ersten Position, die sich innerhalb der Vorrichtung aber außerhalb des Geldscheinpfades befindet, und einer zweiten Position in irgendeinem der Lichtpfade, und Mittel zum Durchführen einer Kalibrierungsoperation, basierend auf der Ausgabe von mindestens einem optischen Empfänger (6;7), wenn der Referenzkörper in der zweiten Position ist.
  15. Vorrichtung nach Anspruch 14, wobei die Kalibrierungsoperation Transmissionsmessungen kalibriert.
  16. Vorrichtung nach Anspruch 14 oder Anspruch 15, wobei die Kalibrierungsoperation Reflektierungsmessungen kalibriert.
EP02258600.2A 2001-12-20 2002-12-13 Vorrichtung zur Erfassung von optischen Eigenschaften eines Geldscheins Expired - Lifetime EP1321904B2 (de)

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Application Number Priority Date Filing Date Title
EP02258600.2A EP1321904B2 (de) 2001-12-20 2002-12-13 Vorrichtung zur Erfassung von optischen Eigenschaften eines Geldscheins

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP01310680A EP1321903A1 (de) 2001-12-20 2001-12-20 Vorrichtung zur Messung optischer Eigenschaften eines Geldscheines
EP01310680 2001-12-20
EP02258600.2A EP1321904B2 (de) 2001-12-20 2002-12-13 Vorrichtung zur Erfassung von optischen Eigenschaften eines Geldscheins

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EP1321904A1 EP1321904A1 (de) 2003-06-25
EP1321904B1 EP1321904B1 (de) 2010-07-14
EP1321904B2 true EP1321904B2 (de) 2020-04-08

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EP1739634A1 (de) 2005-06-29 2007-01-03 MEI, Inc. Banknotenhandhabungsvorrichtung
EP1755088A1 (de) 2005-07-27 2007-02-21 MEI, Inc. Banknotenhandhabungsvorrichtung
JP5021942B2 (ja) * 2006-02-28 2012-09-12 日立オムロンターミナルソリューションズ株式会社 イメージセンサ及び識別装置及びその補正方法
EP1868166A3 (de) 2006-05-31 2007-12-26 MEI, Inc. Verfahren und Vorrichtung zur Validierung von Banknoten
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