EP0920680B1 - Dispositif pour la detection optique d'un materiau en feuille - Google Patents

Dispositif pour la detection optique d'un materiau en feuille Download PDF

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Publication number
EP0920680B1
EP0920680B1 EP98916949A EP98916949A EP0920680B1 EP 0920680 B1 EP0920680 B1 EP 0920680B1 EP 98916949 A EP98916949 A EP 98916949A EP 98916949 A EP98916949 A EP 98916949A EP 0920680 B1 EP0920680 B1 EP 0920680B1
Authority
EP
European Patent Office
Prior art keywords
sheet material
axis
reflectors
reflector
area
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.)
Expired - Lifetime
Application number
EP98916949A
Other languages
German (de)
English (en)
Other versions
EP0920680A1 (fr
Inventor
Michael Stapfer
Michael Fiedler
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+Devrient GmbH
Original Assignee
Giesecke+Devrient GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giesecke+Devrient GmbH filed Critical Giesecke+Devrient GmbH
Publication of EP0920680A1 publication Critical patent/EP0920680A1/fr
Application granted granted Critical
Publication of EP0920680B1 publication Critical patent/EP0920680B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G07D7/121—Apparatus characterised by sensor details

Definitions

  • the invention relates to a device for the optical detection of sheet material, such as. Banknotes or securities.
  • DE 195 17 194 A1 describes a device with a stationary detection device known that the incident from the direction of a detector axis Detects light of an area of the sheet material that is in the direction of an optical Sheet material axis is emitted.
  • the sheet material is used for optical detection along a transport direction on the stationary detection device transported past.
  • the area detected by the detection device includes the entire width of the sheet material perpendicular to the direction of transport, so that the entire area of the sheet material is detected when it is transported past becomes.
  • a lighting device which during the sheet material illuminated for detection.
  • the lighting device has components that illuminate the sheet material from both sides, so that from the Detection device detects both reflected and transmitted light can be.
  • the resolution of the device is approximately 50 dpi. In certain applications, such as. the detection of a banknote number on a banknote This resolution is by means of an "Optical Character Recognition" (OCR) software however too low.
  • OCR Optical Character Recognition
  • the object of the invention is a device to propose for the optical detection of sheet material, which at a little data rate, which is complex to process, has a high resolution at Detection enables.
  • the basic idea of the invention is essentially that only an area of the sheet material is detected with a high resolution, which is preferably smaller than the entire width of the sheet material.
  • the area is selected on the sheet material so that it is suitable for the intended application necessary areas on the sheet material are detected with high resolution become.
  • This is a reflection device with several reflectors provided by means of which from the area of the sheet material in the direction of Sheet material emitted light deflected in the direction of the detector axis becomes.
  • the position of at least two can be adjusted by means of an adjusting device Reflectors for determining the position of the area on the sheet material relative be changed to the detection device.
  • the reflectors are arranged that the length of the optical path of the emitted light from Sheet material to the detection device regardless of the position of the area is on the sheet.
  • An advantage of the device is that it is suitable for intended applications relevant areas can be detected with high resolution.
  • a preferably fixed detection device remains one that has been set once Get adjustment. Because of the constant length of the optical path the detection ensures that an imaging system that has been set once not when determining the position of the area on the sheet material needs to be changed. Since only the position of the adjustment device the relatively light reflectors changed and thus relative to a movement large quantities are dispensed with, the relevant area can be found on the sheet material set very precisely with simple means.
  • the detector axis and the leaf axis arranged in parallel.
  • a first reflector forms with the detector axis a first reflection angle of 45 ° and a second detector with the leaf axis a second reflector angle of 45 °.
  • the reflectors from the Adjustment device in a direction perpendicular to the detector axis or to Sheet material axis shifted parallel.
  • the detector axis and the sheet material axis has a fixed axis angle.
  • a first reflector forms with the detector axis a first reflector angle and a second reflector forms a second reflector angle with the sheet material axis, whereby the second reflector angle as 90 ° minus half the axis angle minus the first reflection angle.
  • the reflectors are from the adjustment device in the direction perpendicular to the bisector of the axis angle parallel postponed.
  • FIG. 1 and 2 show a schematic diagram of a first embodiment of the invention in a side and front view.
  • the sheet material 10 is transported past a housing 20 along a transport direction T.
  • the sheet material 10 is illuminated through a window 21 in the housing 20 or the light emitted by the sheet material is at least partially detected.
  • the lighting device 30 is embodied here as an array of light-emitting diodes which are arranged perpendicular to the transport direction T of the sheet material and at a specific angle to the sheet material axis A 2 or A ' 2 .
  • the light emitted by the light-emitting diodes 30 first passes through an imaging system 31 and then through the window 21 and illuminates an area of the sheet material 10.
  • the area extends in the transport direction T at least over a length 1 and perpendicular to the transport direction T over the entire width G of the Sheet material 10.
  • these can be operated in a pulsed mode, the light-emitting diodes being supplied for a short time with a current which is above the current in continuous operation of the light-emitting diode.
  • the lighting device embodied here as an array of light-emitting diodes If necessary, this can also be done by other means, e.g.
  • the lighting device 30 can be attached or have at least components that the sheet material 10 from that of the housing 20 opposite side is illuminated. This makes it possible to detect and / or transmit light reflected by the sheet material 10.
  • the light emitted by the sheet material 10 in the direction of the sheet material axis A 2 or A ' 2 is deflected in the direction of a detector axis A 1 by means of a reflection device 50.
  • the light deflected in the direction of the detector axis A 1 is detected by means of a preferably stationary detection device.
  • This preferably has a CCD array 40 onto which the light deflected in the direction of the detector axis A 1 is imaged by means of an imaging system 41.
  • the detector axis A 1 and the sheet material axis A 2 and A ' 2 are arranged in parallel.
  • a first reflector 51 of the reflection device 50 is arranged such that it forms a first reflector angle ⁇ with the detector axis A 1 .
  • the reflectors 51 and 52 are preferably designed such that they fully reflect the light that hits them.
  • the light emitted by the sheet material 10 in the area B in the direction of the sheet material axis A 2 is reflected by the second reflector 52 onto the first reflector 51 and from there in the direction of the detector axis A 1 to the detection device.
  • the arrangement of the reflectors 51 and 52 ensures that the length L of the optical path of the emitted light from the sheet material 10 to the detection device is the same in the entire area B of the sheet material.
  • the detector axis A 1 is preferably perpendicular to the CCD array 40 and the sheet material axis A 2 or A ' 2 is perpendicular to the sheet material 10, so that distortion-free imaging of the area B of the sheet material 10 on the CCD array 40 of the detection device is ensured , If the detector axis A 1 is not perpendicular to the CCD array 40 and / or the sheet material axis A 2 or A ' 2 is not perpendicular to the sheet material 10, the resulting distortions can be compensated for, for example, by a suitable imaging system 41. Another possibility for compensating for such distortions is to take them into account accordingly when evaluating the measured values detected by the CCD array 40.
  • the position of the reflectors 51 and 52 for determining the position of the area B on the sheet material relative to the detection device can be changed by an adjustment device, not shown here.
  • the reflectors 51 and 52 are displaced parallel in a direction D perpendicular to the detector axis A 1 or to the sheet material axis A 2 .
  • the shifted position of the reflectors 51 and 52 is denoted in FIG. 1 by 51 'and 52' and shown in broken lines.
  • the length of the reflectors 51 and 52 is preferably selected such that the light emitted over the entire width G of the sheet material 10 in the direction of the sheet material axis A 2 or A ' 2 is deflected in the direction of the detector axis.
  • the widths of the reflectors 51 and 52 are preferably selected such that the light emitted in the direction of the sheet material axis A 2 or A ' 2 falls completely on the imaging system 41. This avoids limiting the beam path.
  • the area can thus be B position over the entire width G of the sheet material 10, the length L of the optical path is retained, so that once imaging system 41 set to the length L of the optical path no longer needs to be adjusted. Because the reflectors 51 and 52 are relative are light, these can be done with simple means, e.g. Stepper motors, very can be adjusted precisely.
  • FIG. 3 shows the position of the areas B and B 'on the sheet material 10. This were chosen here so that the banknote numbers of those shown here Banknote fall into one of the areas.
  • D can also include, for example, a number N of pixels N ⁇ 256 pixels can be selected that are relevant to the intended application are.
  • FIG. 4 shows a schematic diagram of a second embodiment of the invention, in which the detector axis A 1, the sheet material axis A 2 or A ' 2 form an axis angle ⁇ .
  • the axis angle ⁇ is thus determined by the position of the detector 40 and the sheet material 10 relative to one another.
  • a first reflector 51 is provided in the detector axis A 1 , which forms a reflector angle ⁇ with the detector axis, where: 0 ⁇ ⁇ 90 ° - ⁇ / 2. It is hereby achieved that the optical path L intersects the sheet material axis A 2 at a point X.
  • the first reflector angle ⁇ can be freely selected in the range specified.
  • a second reflector 52 is provided at the intersection X, which forms a second reflector angle ⁇ with the sheet material axis A 2 , which results from the axis angle ⁇ and the first reflector angle ⁇ .
  • the reflectors 51 and 52 are moved in a direction D perpendicular to the bisector of the axis angle ⁇ parallel.
  • D ' 2 * D * cos ( ⁇ / 2).
  • An advantage of the second embodiment of the invention is that a shift of the area B to be detected, as it were, with any one relative arrangement between sheet material 10 and detector 40 realized can be.
  • additional stationary reflectors are arranged in the optical path L. become. These additional fixed reflectors are also made in this way arranged that the optical path in the adjustable by the adjusting device Positions of the reflection device 50 is retained.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Eye Examination Apparatus (AREA)
  • Paper (AREA)

Claims (6)

  1. Appareil destiné à la détection optique de feuilles, par exemple de billets de banque, avec
    un dispositif de détection (40, 41) qui détecte la lumière d'une zone (B) de la feuille (10), ladite lumière étant incidente selon la direction d'un axe optique (A1) du détecteur et étant émise de la feuille (10) en direction d'un axe optique (A2, A'2) de la feuille,
    un dispositif d'éclairage (30, 31) qui éclaire au moins la zone (B) de la feuille (10),
       caractérisé en ce que
    il est prévu un dispositif de réflexion (50) avec des réflecteurs (51, 52) au moyen duquel la lumière émise par la zone (B) de la feuille (10) en direction de l'axe de la feuille est déviée en direction de l'axe du détecteur,
    il est prévu un dispositif de réglage qui modifie la position d'au moins deux réflecteurs (52, 51) afin de déterminer la position de la zone (B) sur la feuille (10) par rapport au dispositif de détection (40, 41) de telle manière que la position des au moins deux réflecteurs (51, 52) l'un par rapport à l'autre reste inchangée, et
    les réflecteurs (51, 52) sont disposés de manière que la longueur (L) du chemin optique de la lumière émise par la feuille (10) jusqu'au dispositif de détection (40, 41) soit indépendante de la position de la zone (B) sur la feuille.
  2. Appareil selon la revendication 1, caractérisé en ce que
    l'axe (A1) du détecteur et l'axe (A2, A'2) de la feuille sont parallèles,
    un premier réflecteur (51) forme avec l'axe du détecteur (A1) un premier angle de réflecteur (β) et
    un deuxième réflecteur (52) forme avec l'axe (A2, A'2) de la feuille un deuxième angle de réflecteur (γ) de 90° moins le premier angle de réflecteur (β).
  3. Appareil selon la revendication 2, caractérisé en ce que le dispositif de réglage décale de manière parallèle au moins le premier et le deuxième réflecteur (51, 52) dans une direction (D) perpendiculaire à l'axe (A1) du détecteur ou à l'axe (A2, A'2) de la feuille.
  4. Appareil selon la revendication 1, caractérisé en ce que
    l'axe (A1) du détecteur et l'axe (A2, A'2) de la feuille forment un angle d'axe (α),
    un premier réflecteur (51) forme avec l'axe (A1) du détecteur un premier angle de réflecteur (β) et
    un deuxième réflecteur (52) forme avec l'axe (A2, A'2) de la feuille un deuxième angle de réflecteur (γ) de manière que le deuxième angle de réflecteur (γ) soit le résultat de 90° moins la moitié de l'angle d'axe (α) moins le premier angle de réflecteur (β).
  5. Appareil selon la revendication 4, caractérisé en ce que le dispositif de réglage décale de manière parallèle au moins le premier et le deuxième réflecteur (51, 52) dans une direction (D) perpendiculaire à la bissectrice de l'angle d'axe (α).
  6. Appareil selon une des revendications 1 à 5, caractérisé en ce que le dispositif de réflexion (50) présente au moins un réflecteur fixe.
EP98916949A 1997-03-14 1998-03-13 Dispositif pour la detection optique d'un materiau en feuille Expired - Lifetime EP0920680B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19710621A DE19710621A1 (de) 1997-03-14 1997-03-14 Vorrichtung zur optischen Detektion von Blattgut
DE19710621 1997-03-14
PCT/EP1998/001484 WO1998041955A1 (fr) 1997-03-14 1998-03-13 Dispositif pour la detection optique d'un materiau en feuille

Publications (2)

Publication Number Publication Date
EP0920680A1 EP0920680A1 (fr) 1999-06-09
EP0920680B1 true EP0920680B1 (fr) 2003-02-26

Family

ID=7823393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98916949A Expired - Lifetime EP0920680B1 (fr) 1997-03-14 1998-03-13 Dispositif pour la detection optique d'un materiau en feuille

Country Status (7)

Country Link
US (1) US6040901A (fr)
EP (1) EP0920680B1 (fr)
JP (1) JP2000510988A (fr)
AT (1) ATE233420T1 (fr)
AU (1) AU7035498A (fr)
DE (2) DE19710621A1 (fr)
WO (1) WO1998041955A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19848858B4 (de) * 1998-10-23 2004-08-05 Bundesdruckerei Gmbh Elektrolumineszierendes Halbleiterfestkörperelement in einer Vorrichtung als Prüfmittel für lumineszierende Sicherheitsmerkmale und Verfahren zu dessen Anwendung
RU2158961C1 (ru) * 1999-05-11 2000-11-10 Открытое Акционерное Общество "Пеленг" Видеоспектральный компаратор для контроля ценных бумаг и документов
RU2173886C1 (ru) * 2000-02-23 2001-09-20 Общество с ограниченной ответственностью Фирма "Дата-Центр" Способ определения сдвоенности банкнот и устройство для его осуществления
DE102004035494A1 (de) * 2004-07-22 2006-02-09 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Prüfung von Wertdokumenten
JP2007193387A (ja) * 2006-01-17 2007-08-02 Dainippon Printing Co Ltd セキュリティ情報媒体読取装置
DE102011106523A1 (de) * 2011-07-04 2013-01-10 Giesecke & Devrient Gmbh Prüfgerät und Verfahren zur Kalibrierung eines Prüfgeräts

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2648180C2 (de) * 1976-02-18 1978-09-07 Hoechst Ag, 6000 Frankfurt Vorrichtung zur Echtheitsprüfung eines Identitätsträgers
CH661603A5 (en) * 1985-01-11 1987-07-31 Sodeco Compteurs De Geneve Apparatus for authenticating and identifying valuable documents, especially bank notes
DE4438746C2 (de) * 1993-10-30 1999-03-25 Ricoh Kk Verfahren zum Identifizieren eines Spezialdokuments und Bilderzeugungseinrichtung zur Durchführung dieses Verfahrens
AT402861B (de) * 1994-03-28 1997-09-25 Oesterr Forsch Seibersdorf Verfahren und anordnung zum erkennen bzw. zur kontrolle von flächenstrukturen bzw. der oberflächenbeschaffenheit
JP3209877B2 (ja) * 1995-03-31 2001-09-17 アルプス電気株式会社 光学読み取り装置
DE19517194A1 (de) 1995-05-11 1996-11-14 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Prüfung von Blattgut, wie z.B. Banknoten oder Wertpapiere

Also Published As

Publication number Publication date
US6040901A (en) 2000-03-21
ATE233420T1 (de) 2003-03-15
AU7035498A (en) 1998-10-12
DE19710621A1 (de) 1998-09-17
DE59807300D1 (de) 2003-04-03
JP2000510988A (ja) 2000-08-22
WO1998041955A1 (fr) 1998-09-24
EP0920680A1 (fr) 1999-06-09

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