EP0920680B1 - Device for optically detecting sheet material - Google Patents

Device for optically detecting sheet material 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
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EP
European Patent Office
Prior art keywords
sheet material
axis
reflectors
reflector
area
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EP98916949A
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German (de)
French (fr)
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EP0920680A1 (en
Inventor
Michael Stapfer
Michael Fiedler
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Giesecke and Devrient GmbH
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Giesecke and Devrient GmbH
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Publication of EP0920680A1 publication Critical patent/EP0920680A1/en
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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

  • 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.

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

Abstract

PCT No. PCT/EP98/01484 Sec. 371 Date Jan. 5, 1997 Sec. 102(e) Date Jan. 5, 1997 PCT Filed Mar. 13, 1998 PCT Pub. No. WO98/41955 PCT Pub. Date Sep. 24, 1998The apparatus positions an area on the sheet material, the area being detected with high resolution. For this purpose a reflection device with a plurality of reflectors is provided for deflecting the light emitted by the area of the sheet material in the direction of a sheet material axis in the direction of a detector axis. An adjusting device is used to change the position of at least two reflectors for fixing the position of the area on the sheet material relative to the detection device. The reflectors are disposed so that the length of the optical path of the emitted light from the sheet material to the detection device is equal in the total area of the sheet material and at least in a plurality of positions of the reflection device adjustable by the adjusting device.

Description

Die Erfindung betrifft eine Vorrichtung zur optischen Detektion von Blattgut, wie z.B. Banknoten oder Wertpapiere.The invention relates to a device for the optical detection of sheet material, such as. Banknotes or securities.

Aus der DE 195 17 194 A1 ist eine Vorrichtung mit einer ortsfesten Detektionseinrichtung bekannt, die das aus Richtung einer Detektorachse einfallende Licht eines Bereichs des Blattguts detektiert, das in Richtung einer optischen Blattgutachse emittiert wird. Zur optischen Detektion wird das Blattgut entlang einer Transportrichtung an der ortsfesten Detektionseinrichtung vorbeitransportiert. Der von der Detektionseinrichtung detektierte Bereich beinhaltet die gesamte Breite des Blattguts senkrecht zur Transportrichtung, so dass beim Vorbeitransport die gesamte Fläche des Blattguts detektiert wird.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.

Zudem ist eine Beleuchtungseinrichtung vorgesehen, die das Blattgut während der Detektion beleuchtet. Die Beleuchtungseinrichtung weist Komponenten auf, die das Blattgut von beiden Seiten beleuchten, so dass von der Detektionseinrichtung sowohl reflektiertes als auch transmittiertes Licht detektiert werden kann.In addition, a lighting device is provided 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.

Die Auflösung der Vorrichtung beträgt ca. 50 dpi. Bei bestimmten Anwendungen, wie z.B. die Erkennung einer Banknotennummer auf einer Banknote mittels einer "Optical Character Recognition" (OCR)-Software ist diese Auflösung jedoch zu gering. Eine Erhöhung der Auflösung auf ca. 250 dpi, z.B. zur Erkennung einer Banknotennummer, führt jedoch zu sehr hohen Datenraten, die ca. um einen Faktor 25 über den Datenraten der bekannten Vorrichtung liegen. Problematisch hierbei ist, dass solche Datenraten, wenn überhaupt, nur extrem aufwendig zu verarbeiten sind. 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. An increase in resolution to approx. 250 dpi, e.g. to recognize a banknote number, but leads to very high data rates, which is about a factor of 25 above the data rates of the known device lie. The problem here is that such data rates, if at all, are extremely difficult to process.

Ausgehend davon liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung zur optischen Detektion von Blattgut vorzuschlagen, die bei einer wenig aufwendig zu verarbeitenden Datenrate eine hohe Auflösung bei der Detektion ermöglicht.Proceeding from this, 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.

Diese Aufgabe wird durch die Merkmale des Hauptanspruchs gelöst.This object is solved by the features of the main claim.

Der Grundgedanke der Erfindung besteht im Wesentlichen darin, dass lediglich ein Bereich des Blattguts mit einer hohen Auflösung detektiert wird, der bevorzugt kleiner ist als die gesamte Breite des Blattguts. Der Bereich wird auf dem Blattgut so gewählt, dass die für die beabsichtigte Anwendung notwendigen Bereiche auf dem Blattgut mit hoher Auflösung detektiert werden. Hierzu ist eine Reflektionseinrichtung mit mehreren Reflektoren vorgesehen, mittels der das von dem Bereich des Blattguts in Richtung der Blattgutachse emittierte Licht in Richtung der Detektorachse umgelenkt wird. Mittels einer Verstelleinrichtung kann die Position zumindest zweier Reflektoren zur Festlegung der Position des Bereichs auf dem Blattgut relativ zur Detektionseinrichtung verändert werden. Die Reflektoren sind so angeordnet, dass die Länge des optischen Weges des emittierten Lichts vom Blattgut bis zur Detektionseinrichtung unabhängig von der Position des Bereichs auf dem Blattgut ist.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.

Ein Vorteil der Vorrichtung ist es, dass die für beabsichtigten Anwendungen relevanten Bereiche mit hoher Auflösung detektiert werden können. Durch eine bevorzugt ortsfeste Detektionseinrichtung bleibt eine einmal eingestellte Justierung erhalten. Aufgrund der konstanten Länge des optischen Weges bei der Detektion ist gewährleistet, dass ein einmal eingestelltes Abbildungssystem bei der Festlegung der Position des Bereichs auf dem Blattgut nicht verändert werden muß. Da von der Verstelleinrichtung lediglich die Position der relativ leichten Reflektoren verändert und so auf eine Bewegung relativ großer Massen verzichtet wird, läßt sich der relevante Bereich auf dem Blattgut mit einfachen Mitteln sehr präzise einstellen.An advantage of the device is that it is suitable for intended applications relevant areas can be detected with high resolution. By 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.

In einer ersten bevorzugten Ausführungsform sind die Detektorachse und die Blattachse parallel angeordnet. Ein erster Reflektor bildet mit der Detektorachse einen ersten Reflektionswinkel von 45° und ein zweiter Detektor mit der Blattgutachse einen zweiten Reflektorwinkel von 45°. Zur Festlegung der Position des Bereichs auf dem Blattgut werden die Reflektoren von der Verstelleinrichtung in einer Richtung senkrecht zur Detektorachse bzw. zur Blattgutachse parallel verschoben.In a first preferred embodiment, 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 °. To fix the position of the area on the sheet material, the reflectors from the Adjustment device in a direction perpendicular to the detector axis or to Sheet material axis shifted parallel.

In einer zweiten bevorzugten Ausführungsform bilden die Detektorachse und die Blattgutachse einen festen Achsenwinkel. Ein erster Reflektor bildet mit der Detektorachse einen ersten Reflektorwinkel und ein zweiter Reflektor bildet mit der Blattgutachse einen zweiten Reflektorwinkel, wobei sich der zweite Reflektorwinkel als 90° minus dem halben Achsenwinkel minus dem ersten Reflektionswinkel ergibt. Zur Festlegung der Position des Bereichs auf dem Blattgut werden die Reflektoren von der Verstelleinrichtung in Richtung senkrecht zur Winkelhalbierenden des Achsenwinkels parallel verschoben.In a second preferred embodiment form 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. To determine the position of the area on the sheet material, the reflectors are from the adjustment device in the direction perpendicular to the bisector of the axis angle parallel postponed.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen und den nachfolgenden Ausführungsbeispielen der Erfindung, die anhand der Figuren beschrieben werden.Further features and advantages of the invention emerge from the subclaims and the following exemplary embodiments of the invention, which are described with reference to the figures.

Es zeigen:

Fig. 1
Prinzipskizze einer Seitenansicht einer ersten Ausführungsform,
Fig. 2
Prinzipskizze einer Frontalansicht der ersten Ausführungsform,
Fig. 3
Position der detektierten Bereiche auf dem Blattgut,
Fig. 4
Prinzipskizze einer zweiten Ausführungsform der Erfindung.
Show it:
Fig. 1
Schematic diagram of a side view of a first embodiment,
Fig. 2
Schematic diagram of a frontal view of the first embodiment,
Fig. 3
Position of the detected areas on the sheet material,
Fig. 4
Schematic diagram of a second embodiment of the invention.

Die Fig. 1 und 2 zeigen eine Prinzipskizze einer ersten Ausführungsform der Erfindung in einer Seiten- bzw. Frontalansicht. Zur Detektion wird das am Blattgut 10 entlang einer Transportrichtung T an einem Gehäuse 20 vorbeitransportiert. Durch ein Fenster 21 im Gehäuse 20 wird das Blattgut 10 beleuchtet bzw. das vom Blattgut emittierte Licht zumindest teilweise detektiert. Die Beleuchtungseinrichtung 30 ist hier als ein Array von Leuchtdioden ausgeführt, die senkrecht zur Transportrichtung T des Blattguts und in einem bestimmten Winkel zur Blattgutachse A2 bzw. A'2 angeordnet sind. Das von den Leuchtdioden 30 emittierte Licht tritt zunächst durch ein Abbildungssystem 31 und dann durch das Fenster 21 und beleuchtet einen Bereich des Blattguts 10. Der Bereich erstreckt sich in Transportrichtung T zumindest über eine Länge 1 und senkrecht zur Transportrichtung T über die gesamte Breite G des Blattguts 10. Um eine hohe Lichtintensität von den Leuchtdioden zu erhalten, können diese in einem Pulsbetrieb betrieben werden, wobei die Leuchtdioden für kurze Zeiten mit einem Strom versorgt werden, der über dem Strom im Dauerbetrieb der Leuchtdiode liegt.1 and 2 show a schematic diagram of a first embodiment of the invention in a side and front view. For detection, 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. In order to obtain a high light intensity from the light-emitting diodes, 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.

Alternativ zu der hier als ein Array von Leuchtdioden ausgeführten Beleuchtungseinrichtung 30 kann diese bei Bedarf auch mit anderen Mitteln, wie z.B. As an alternative to the lighting device embodied here as an array of light-emitting diodes If necessary, this can also be done by other means, e.g.

Glühbirnen in Verbindung mit entsprechenden Reflektoren ausgeführt werden. Weiterhin kann die Beleuchtungseinrichtung 30 so angebracht sein oder zumindest Komponenten aufweisen, dass das Blattgut 10 von der dem Gehäuse 20 gegenüberliegenden Seite beleuchtet wird. Hierdurch ist es möglich, vom Blattgut 10 reflektiertes und/oder transmittiertes Licht zu detektieren.Light bulbs in connection with appropriate reflectors. Furthermore, 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.

Das vom Blattgut 10 in Richtung der Blattgutachse A2 bzw. A'2 emittierte Licht wird mittels einer Reflektionseinrichtung 50 in Richtung einer Detektorachse A1 umgelenkt. Das in Richtung der Detektorachse A1 umgelenkte Licht wird mittels einer bevorzugt ortsfesten Detektionseinrichtung detektiert. Diese weist bevorzugt ein CCD-Array 40 auf, auf das das in Richtung der Detektorachse A1 umgelenkte Licht mittels eines Abbildungssystems 41 abgebildet wird.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.

In der ersten Ausführungsform sind die Detektorachse A1 und die Blattgutachse A2 bzw. A'2 parallel angeordnet. Ein erster Reflektor 51 der Reflektionseinrichtung 50 ist so angeordnet, dass er mit der Detektorachse A1 einen ersten Reflektorwinkel β bildet. Es gilt: 0 < β < 90°. Hierdurch wird erreicht, dass der optische Weg L des Lichts entlang der Detektorachse A1 die Blattgutachse A2 in einem Punkt Y schneidet. In diesem Punkt Y wird ein zweiter Reflektor 52 der Reflektionseinrichtung 50 vorgesehen, der mit der Blattgutachse A2 einen zweiten Reflektorwinkel γ mit γ = 90° - β bildet. Die Reflektoren 51 und 52 bilden somit einen Winkel δ = 90°. Bevorzugt wird β = γ = 45° gewählt.In the first embodiment, 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 β with the detector axis A 1 . The following applies: 0 <β <90 °. It is hereby achieved that the optical path L of the light intersects the sheet material axis A 2 at a point Y along the detector axis A 1 . At this point Y, a second reflector 52 of the reflection device 50 is provided, which forms a second reflector angle γ with γ = 90 ° - β with the sheet material axis A 2 . The reflectors 51 and 52 thus form an angle δ = 90 °. Β = γ = 45 ° is preferably selected.

Weiterhin sind die Reflektoren 51 bzw. 52 bevorzugt so ausgeführt, dass sie das auf sie treffende Licht vollständig reflektieren. Für bestimmte Anwendungen ist es jedoch möglich, zumindest einzelne Reflektoren beispielsweise teildurchlässig, dichroitisch oder polarisierend auszugestalten. Weiterhin ist bei Bedarf auch eine Verwendung von Prismen als Reflektoren möglich.Furthermore, the reflectors 51 and 52 are preferably designed such that they fully reflect the light that hits them. For certain applications however, it is possible to use at least individual reflectors, for example partially permeable, dichroic or polarizing. Still is if necessary, prisms can also be used as reflectors.

Das vom Blattgut 10 im Bereich B in Richtung der Blattgutachse A2 emittierte Licht wird vom zweiten Reflektor 52 auf den ersten Reflektor 51 und von dort in Richtung der Detektorachse A1 zur Detektionseinrichtung reflektiert. Durch die Anordnung der Reflektoren 51 und 52 ist gewährleistet, dass die Länge L des optischen Weges des emittierten Lichts vom Blattgut 10 bis zur Detektionseinrichtung im gesamten Bereich B des Blattguts gleich ist. Es gilt: L = L11 +L12 + L13 =L21 + L22 + L23. Hierdurch kann der gesamte Bereich B des Blattgutes problemlos mit dem Abbildungssystem 41 auf den Detektor 40 abgebildet werden.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 following applies: L = L 11 + L 12 + L 13 = L 21 + L 22 + L 23 . As a result, the entire area B of the sheet material can be imaged with the imaging system 41 on the detector 40 without any problems.

Bevorzugt steht die Detektorachse A1 senkrecht auf dem CCD-Array 40 und die Blattgutachse A2 bzw. A'2 senkrecht auf dem Blattgut 10, so dass eine verzerrungsfreie Abbildung des Bereichs B des Blattguts 10 auf das CCD-Array 40 der Detektionseinrichtung gewährleistet wird. Steht die Detektorachse A1 nicht senkrecht auf dem CCD-Array 40 und/oder die Blattgutachse A2 bzw. A'2 nicht senkrecht auf dem Blattgut 10, können die dadurch auftretenden Verzerrungen beispielsweise durch ein geeignetes Abbildungssystem 41 ausgeglichen werden. Eine andere Möglichkeit zum Ausgleichen solcher Verzerrungen besteht darin, diese bei der Auswertung der vom CCD-Array 40 detektierten Messwerte entsprechend zu berücksichtigen.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.

Durch eine hier nicht dargestellte Verstelleinrichtung kann die Position der Reflektoren 51 und 52 zur Festlegung der Position des Bereichs B auf dem Blattgut relativ zur Detektionseinrichtung verändert werden. Hierzu werden die Reflektoren 51 und 52 in einer Richtung D senkrecht zur Detektorachse A1 bzw. zur Blattgutachse A2 parallel verschoben. Die verschobene Position der Reflektoren 51 und 52 ist in der Fig. 1 mit 51' bzw. 52' bezeichnet und strichliert dargestellt. Der Bereich B wird hierbei als Bereich B' in Richtung D' verschoben. Es gilt: D' = 2 * D.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. For this purpose, 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. Area B is shifted as area B 'in direction D'. The following applies: D '= 2 * D.

Die Länge der Reflektoren 51 und 52 ist bevorzugt so gewählt, dass das über die gesamte Breite G des Blattguts 10 in Richtung der Blattgutachse A2 bzw. A'2 emittierte Licht in Richtung der Detektorachse umgelenkt wird. Die Breiten der Reflektoren 51 und 52 werden bevorzugt so gewählt, dass das in Richtung der Blattgutachse A2 bzw. A'2 emittierte Licht vollständig auf das Abbildungssystem 41 fällt. Hierdurch wird eine Begrenzung des Strahlenganges vermieden. Durch die Anordnung der Reflektoren 51 und 52 ist gewährleistet, dass die Länge L des optischen Wegs über die gesamte Breite G des Blattguts 10 und speziell auch im Bereich B' gleich ist. Es gilt: L' = L'11 + L'12 + L'13 = L'21 + L'22 + L'23 = L.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 arrangement of the reflectors 51 and 52 ensures that the length L of the optical path is the same over the entire width G of the sheet material 10 and especially also in the region B '. The following applies: L '= L' 11 + L '12 + L' 13 = L '21 + L' 22 + L '23 = L.

Aufgrund der Anordnung der Reflektoren 51 und 52 läßt sich somit der Bereich B über die gesamte Breite G des Blattguts 10 beliebig positionieren, wobei die Länge L des optischen Weges erhalten bleibt, so dass ein einmal auf die Länge L des optischen Weges eingestelltes Abbildungssystem 41 nicht mehr nachgeregelt werden muss. Da die Reflektoren 51 und 52 relativ leicht sind, können diese mit einfachen Mitteln, wie z.B. Schrittmotoren, sehr präzise verstellt werden.Due to the arrangement of the reflectors 51 and 52, 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.

Die Fig. 3 zeigt die Lage der Bereiche B und B' auf dem Blattgut 10. Diese wurden hier so gewählt, dass die Banknotennummern der hier dargestellten Banknote jeweils in einen der Bereiche fallen. Die Auflösung der Vorrichtung hängt hierbei von der Anzahl N der Pixel des CCD-Arrays 40 und von der gewünschten Breite b eines Bildelements auf dem Blattgut ab. Für die Größe eines Bildelementes P auf dem Blattgut 10 gilt P = 1 * b. Für eine gewünschte Auflösung von 250 dpi wird 1 = b = 0,1 mm gewählt. Mit einer Anzahl N = 256 Pixel des CCD-Arrays ergibt sich die Breite des Bereichs B zu B = N * b = 25,6 mm.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. The resolution of the device depends on the number N of pixels in the CCD array 40 and on the desired width b of a picture element on the sheet material. For the size of a picture element P on the sheet material 10 applies P = 1 * b. For a desired one Resolution of 250 dpi is chosen 1 = b = 0.1 mm. With a number N = 256 pixels of the CCD array gives the width of area B to B = N * b = 25.6 mm.

Bei einer gewünschten Transportgeschwindigkeit der Banknote von T = 10 m/s und einer Farbtiefe von 1 Byte/Pixel, das entspricht 256 Grauwerten, ergibt sich eine Datenrate D von D = N * T * F/I = 25,6 MB/s. Um die Datenrate D zu senken, können beispielsweise auch eine Anzahl N von Pixeln mit N < 256 Pixel ausgewählt werden, die für die beabsichtigte Anwendung relevant sind.With a desired transport speed of the banknote of T = 10 m / s and a color depth of 1 byte / pixel, which corresponds to 256 gray values, this results in a data rate D of D = N * T * F / I = 25.6 MB / s. To the data rate Lowering 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.

Die Fig. 4 zeigt eine Prinzipskizze einer zweiten Ausführungsform der Erfindung, bei der die Detektorachse A1 die Blattgutachse A2 bzw. A'2 einen Achsenwinkel α bilden. Es gilt: 0 < α < 180°. Der Achsenwinkel α wird somit durch die Lage des Detektors 40 und des Blattguts 10 zueinander bestimmt. In der Detektorachse A1 wird ein erster Reflektor 51 vorgesehen, der mit der Detektorachse einen Reflektorwinkel β bildet, wobei gilt: 0 < β < 90° - α/2. Hierdurch wird erreicht, dass der optische Weg L die Blattgutachse A2 in einem Punkt X schneidet. Prinzipiell kann der erste Reflektorwinkel β in dem angegebenen Bereich frei gewählt werden.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 α. The following applies: 0 <α <180 °. The axis angle α 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 β with the detector axis, where: 0 <β <90 ° - α / 2. It is hereby achieved that the optical path L intersects the sheet material axis A 2 at a point X. In principle, the first reflector angle β can be freely selected in the range specified.

Weiterhin wird im Schnittpunkt X ein zweiter Reflektor 52 vorgesehen, der mit der Blattgutachse A2 einen zweiten Reflektorwinkel γ bildet, der sich aus dem Achsenwinkel α und dem ersten Reflektorwinkel β ergibt. Es gilt: γ= 90° - α/2 -β. Aus dieser Anordnung ergibt sich, dass die Reflektoren 51 und 52 einen Winkel δ bilden mit δ = 90° + α/2.Furthermore, a second reflector 52 is provided at the intersection X, which forms a second reflector angle γ with the sheet material axis A 2 , which results from the axis angle α and the first reflector angle β. The following applies: γ = 90 ° - α / 2 -β. It follows from this arrangement that the reflectors 51 and 52 form an angle δ with δ = 90 ° + α / 2.

Zur Verschiebung des Schnittpunkts der optischen Achse A2 mit dem Blattgut 10 in Richtung D' in den Schnittpunkt des Blattguts 10 mit der Blattgutachse A'2 werden die Reflektoren 51 und 52 in eine Richtung D senkrecht zur Winkelhalbierenden des Achsenwinkels α parallel verschoben. Es gilt: D' = 2 * D * cos (α/2). Auch bei dieser Anordnung der Reflektoren 51 und 52 bleibt die Länge des optischen Weges erhalten. Es gilt: L"11 + L"12 + L"13 = L"21 + L"22 + L"23.To shift the intersection of the optical axis A 2 with the sheet material 10 in the direction D 'into the intersection of the sheet material 10 with the sheet material axis A' 2 , the reflectors 51 and 52 are moved in a direction D perpendicular to the bisector of the axis angle α parallel. The following applies: D '= 2 * D * cos (α / 2). With this arrangement of the reflectors 51 and 52, the length of the optical path is retained. The following applies: L " 11 + L" 12 + L " 13 = L" 21 + L " 22 + L" 23 .

Ein Vorteil der zweiten Ausführungsform der Erfindung liegt darin, dass eine Verschiebung des zu delektierenden Bereichs B quasi mit jeder beliebigen relativen Anordnung zwischen Blattgut 10 und Detektor 40 realisiert werden kann. Um eine möglichst kompakte Anordnung zu erhalten, können optional zusätzlich weitere ortsfeste Reflektoren im optischen Weg L angeordnet werden. Auch diese zusätzlichen ortsfesten Reflektoren werden so angeordnet, dass der optische Weg in den durch die Verstelleinrichtung einstellbaren Positionen der Reflektionseinrichtung 50 erhalten bleibt.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. In order to obtain the most compact possible arrangement, optionally 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.

Claims (6)

  1. An apparatus for optical detection of sheet material such as bank notes having
    a detection device (40, 41) for detecting the light of an area (B) of the sheet material (10) incident from the direction of an optical detector axis (A1 ) and emitted by the sheet material (10) in the direction of an optical sheet material axis (A2 , A'2 ),
    an illumination device (30, 31) for illuminating at least the area (B) of the sheet material (10),
    characterized in that
    a reflection device (50) with reflectors (51, 52) is provided for deflecting the light emitted by the area (B) of the sheet material (10) in the direction of the sheet material axis in the direction of the detector axis,
    an adjusting device is provided for changing the position of at least two reflectors (51, 52) for fixing the position of the area (B) on the sheet material (10) relative to the detection device (40, 41), the position of the at least two reflectors (51, 52) remaining unchanged relative to each other, and
    the reflectors (51, 52) are disposed so that the length (L) of the optical path of the emitted light from the sheet material (10) to the detector device (40, 41) is independent of the position of the area (B) on the sheet material.
  2. The apparatus of claim 1, characterized in that
    the detector axis (A1 ) and the sheet material axis (A2 , A'2 ) are disposed parallel,
    a first reflector (51) forms a first reflector angle (β) with the detector axis (A1 ), and
    a second reflector (52) forms with the sheet material axis (A2 , A'2 ) a second reflector angle (γ) of 90° minus the first reflector angle (β).
  3. The apparatus of claim 2, characterized in that the adjusting device shifts at least the first and second reflectors (51, 52) parallel in a direction (D) perpendicular to the detector axis (A1 ) or to the sheet material axis (A2 , A'2 ).
  4. The apparatus of claim 1, characterized in that
    the detector axis (A1 ) and the sheet material axis (A2 , A'2 ) form an axis angle (α),
    a first reflector (51) forms a first reflector angle (β) with the detector axis (A1 ), and
    a second reflector (52) forms a second reflector angle (γ) with the sheet material axis (A2 , A'2 ), the second reflector angle (γ) resulting as 90° minus half the axis angle (α) minus the first reflector angle (β).
  5. The apparatus of claim 4, characterized in that the adjusting device shifts at least the first and second reflectors (51, 52) parallel in a direction (D) perpendicular to the median line of the axis angle (α).
  6. The apparatus of any of claims 1 to 5, characterized in that the reflection device (50) has at least one stationary reflector.
EP98916949A 1997-03-14 1998-03-13 Device for optically detecting sheet material Expired - Lifetime EP0920680B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19710621A DE19710621A1 (en) 1997-03-14 1997-03-14 Device for the optical detection of sheet material
DE19710621 1997-03-14
PCT/EP1998/001484 WO1998041955A1 (en) 1997-03-14 1998-03-13 Device for optically detecting sheet material

Publications (2)

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

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Application Number Title Priority Date Filing Date
EP98916949A Expired - Lifetime EP0920680B1 (en) 1997-03-14 1998-03-13 Device for optically detecting sheet material

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19848858B4 (en) * 1998-10-23 2004-08-05 Bundesdruckerei Gmbh Electroluminescent semiconductor solid element in a device as a test device for luminescent security features and method for its use
DE102004035494A1 (en) * 2004-07-22 2006-02-09 Giesecke & Devrient Gmbh Device and method for checking value documents
JP2007193387A (en) * 2006-01-17 2007-08-02 Dainippon Printing Co Ltd Security information medium reader
DE102011106523A1 (en) * 2011-07-04 2013-01-10 Giesecke & Devrient Gmbh Test apparatus and method for calibrating a tester

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2648180C2 (en) * 1976-02-18 1978-09-07 Hoechst Ag, 6000 Frankfurt Device for checking the authenticity of an identity carrier
CH661603A5 (en) * 1985-01-11 1987-07-31 Sodeco Compteurs De Geneve Apparatus for authenticating and identifying valuable documents, especially bank notes
DE4438746C2 (en) * 1993-10-30 1999-03-25 Ricoh Kk Method for identifying a special document and image generation device for carrying out this method
AT402861B (en) * 1994-03-28 1997-09-25 Oesterr Forsch Seibersdorf METHOD AND ARRANGEMENT FOR DETECTING OR FOR CONTROLLING AREA STRUCTURES OR THE SURFACE TEXTURE
JP3209877B2 (en) * 1995-03-31 2001-09-17 アルプス電気株式会社 Optical reader
DE19517194A1 (en) 1995-05-11 1996-11-14 Giesecke & Devrient Gmbh Device and method for checking sheet material, e.g. Banknotes or securities

Also Published As

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

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