EP0537431B1 - Dispositif pour la reconnaissance optique de documents - Google Patents

Dispositif pour la reconnaissance optique de documents Download PDF

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Publication number
EP0537431B1
EP0537431B1 EP92113171A EP92113171A EP0537431B1 EP 0537431 B1 EP0537431 B1 EP 0537431B1 EP 92113171 A EP92113171 A EP 92113171A EP 92113171 A EP92113171 A EP 92113171A EP 0537431 B1 EP0537431 B1 EP 0537431B1
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EP
European Patent Office
Prior art keywords
light
light sources
document
illumination
plane
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
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EP92113171A
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German (de)
English (en)
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EP0537431A1 (fr
Inventor
Ivo De Man
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Mars Inc
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Mars Inc
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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
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties
    • 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
    • G07D7/20—Testing patterns thereon

Definitions

  • the invention relates to a device for optical recognition of documents of the type mentioned in the preamble of claim 1.
  • Such devices for optically recognizing documents are used, for example, in banknote acceptors for optically recognizing banknotes.
  • a device for optically recognizing documents is known from US Pat. No. 4,319,137, which recognizes a printed sheet on the basis of printed features.
  • An elongated source of white light illuminates a narrow strip that extends across the sheet.
  • the light scattered from the sheet in the strip or shining through the sheet there is captured simultaneously by means of three photosensors arranged in a row.
  • Each photosensor only registers light from a narrow spectral range, e.g. B. in the color red, green or blue.
  • the photosensors transmit three electrical signals corresponding to the three colors to an evaluation device.
  • DE-PS 37 05 870 describes a device which can be used as a read head and which enables line-by-line scanning of a sheet.
  • the device has a row of photodiodes, to each of which a pair of light-emitting diodes inclined relative to one another is assigned. Each pair of LEDs illuminates the sheet in an area immediately in front of the associated photodiode.
  • a collimator is arranged in front of each photodiode and blocks all light that does not come from the area of the sheet immediately in front of the photodiode.
  • the reading head produces a monochrome, rasterized image of a print pattern on the sheet.
  • EP-A 338 123 it is known from EP-A 338 123 to form the read head from a group of interchangeable modules arranged in parallel, which form the linear arrangement of photodiodes and Have light sources and optically scan the sheet in strips. Each module works in the light of a predetermined color and produces the signals for a rasterized monochrome image of the print pattern on the sheet.
  • a device for scanning a sheet with a single photosensor is known from CH-PS 573 634, wherein a small circular area on the sheet is successively illuminated with individual light sources of different spectral color arranged at an angle to the sheet plane.
  • the only photosensor receives light in the respective spectral range, which is scattered into the photosensor perpendicular to the sheet plane. Moving the sheet after each cycle enables a narrow strip to be scanned on the sheet.
  • the light sources and the photosensors are arranged in relation to the sheet plane in such a way that no light directly reflected on the sheet surface reaches the photosensors.
  • the invention has for its object to provide an inexpensive device for optically recognizing documents, which enables reliable detection of colored features on the sheet surface of the document.
  • 1 means a sheet-like document with a one-color or multi-color printed identifying pattern, as it is e.g. B. of banknotes is known.
  • a means of transport 2 transports the document 1 flat in a transport plane 3 through a device for recognizing documents 1. Outside the transport plane 3 are photosensitive elements, e.g. B. photosensors 4, arranged, the optical axes of which are perpendicular to the transport plane 3 and define a single sensor plane 5 transverse to a transport direction 6 of the document 1.
  • the photosensors 4 form at least one equidistant row with one another in the sensor plane 5, the distance between the row of the photosensors 4 and the transport plane 3 being predetermined.
  • the photosensors 4 are set up to convert light 7 from a wide spectral range into electrical sensor signals S.
  • the spectral range includes, for example, wavelengths from 0.4 microns to 10 microns, as z. B. is the case with semiconductor photoelectric elements made of silicon.
  • the light 7 can e.g. B. be scattered on document 1.
  • the photosensors 4 have an acceptance angle ⁇ , measured perpendicular to the sensor plane 5, for the incident light 7 and thereby, measured in the transport direction 6, determine the width of an area 8 on the document 1 which essentially overlaps as a narrow strip transversely to the transport direction 6 the width of the document 1 extends. Since the transport means 2 transports the document 1 in the transport direction 6, the area 8 migrates over the entire document 1.
  • the area 8 is formed by at least one, but preferably two symmetrically arranged, light sources Luminous lines 9, 10 illuminated.
  • the optical axes of the light sources in a light line 9 or 10 determine a light level 11 or 12.
  • the light levels 11, 12 intersect at an angle ⁇ in the common intersection line between the transport level 3 and the sensor level 5, which is the bisecting plane between the two light levels 11 and 12 shares the angle ⁇ .
  • the light sources are arranged equidistantly in both luminous lines 9 and 10. Both light lines 9, 10 are at the same distance from the transport plane 3 in the light plane 11, 12 and are symmetrical to the sensor plane 5.
  • the light sources of the two luminous lines 9, 10 together illuminate at least area 8.
  • the mean angle of incidence of a radiation from the light sources illuminating document 1 is ⁇ / 2 and is dimensioned such that, despite the surface structure of document 1, no direct reflections get into photosensors 4 and on the other hand the sensitivity of the device to small variations in the distance of the documents 1 from the transport plane 3 is imperceptible. This is advantageous for reading crumpled documents 1.
  • a control unit 13 is connected to the light sources of the light levels 11, 12 by means of feed lines 14.
  • One signal line 15 each connects the photo sensors 4 and the feed device 13.
  • a control line 16 establishes a connection between the feed device 13 and a drive 17 of the transport means 2.
  • a signal output of the control device 13 is connected to a data line 18 with a data input of an evaluation unit 19.
  • the control device 13 is set up to feed the light sources in the luminous lines 11 and 12 and to amplify and digitize the sensor signals S.
  • the control device 13 preferably enables the light sources to be switched on and off briefly by means of a built-in clock generator 20, the light sources, for example individually or in a cycle Z of work steps t predetermined by the clock generator 20 in groups, illuminate one after the other for a predetermined cycle time t and illuminate document 1 in area 8.
  • the cycle Z repeats itself, the transport means 2, for example, moving the document 1 by the width of the area 8 in the first step t1.
  • the control device 13 has an input with an amplifier 13 ′ for each signal line 15, the gain factor of which can be set with an external signal, and is set up for digitizing the amplified, analog electrical sensor signals S.
  • the sensor signals S proportional to the light intensity of the light received by the photosensors 4 reach the input of the connected amplifier 13 'via each of the signal lines 15.
  • the control unit 13 amplifies and digitizes the sensor signals S arriving at each work step t and passes them in digitized form as a group of numbers via the data line 18 to the evaluation unit 19.
  • the amplifiers 13 'can be Unit 19 receive setting variables generated, which serve as external signals for adjusting the gain factors.
  • the clock 20 controls the drive 17 of the transport means 2, for example in a first step t1 of the cycle Z the document 1 is moved in the transport direction 6 so that the photosensors 4 can scan a new area 8.
  • the evaluation unit 19 receives a predetermined number of groups of numbers characterizing the area 8. As soon as the document 1 has been scanned in the predetermined areas 8, the evaluation unit 19 can compare these groups of numbers with predetermined sample number groups, which are stored in the evaluation unit 19, and can decide whether to accept or return the document 1.
  • Optical means 21 can advantageously be arranged in the beam path in front of the photosensors 4 so that the light 7 scattered on the document 1 is largely independent of the optical properties collect the photosensors 4 and feed them.
  • the optical means 21 are preferably inexpensive aspherical plastic lenses or a diffractive optically effective, holographic optical element which can be embossed in plastic.
  • polyesters, polycarbonates, etc. are suitable as plastics.
  • Additional light sources advantageously increase the discriminatory power of the device for optically recognizing documents 1, since not only the scattered light 7 serves as the only distinguishing feature, but also the transparency of the document 1 and / or the fluorescence of the dyes present on the document 1.
  • a further row of lights 22 can be arranged on the side of the document 1 facing away from the photosensors 4 in the sensor plane 5, the optical axes of the light sources of the row of lights 22 being aligned in the sensor plane 5 such that the area 8 on the side facing away from the photosensors 4 of document 1 is illuminated.
  • the light sources of the row of lights 22 are connected to the control device 13 via supply lines 23.
  • the clock generator 20 controls the switching on and off of the light sources of the light row 22 in additional work steps t.
  • the light 7 which shines through the document 1 is collected by the optical means 21 and fed to the photosensors 4.
  • a source of ultraviolet light a UV source 24, which extends over the entire width of the document 1, can be arranged parallel to the region 8 on the side of the document 1 which faces the photosensors 4. Of course, this UV source 24 must not hinder reception of the light 7 in the photosensor 4.
  • the UV source 24 is supplied with a line from the control unit 13, which is not shown here, and is switched on and off in an additional work step t of the clock generator 20 during a predetermined cycle time.
  • Further optical means can concentrate the light emitted by the light sources on the region 8 as beam optics 21 ', 21 ", 21"'.
  • a plate 25, 25 ' forms the transport plane 3 (FIG. 1) and is part of a transport channel delimited by channel walls 26, in which the flatly spread document 1 is aligned parallel to the one channel wall 26 and can be displaced in the transport direction 6 .
  • the transport means 2 moves the document 1 through the sensor plane 5 under the row of photosensors 4, 4 '.
  • the two luminous lines 9 and 10 for illuminating the area 8 are arranged symmetrically to the sensor level 5. In the drawing, the light sources of the luminous lines 9, 10 are shown as dots.
  • the light lines 9, 10 and the light row 22 (FIG. 1) can extend over the entire width of the transport channel.
  • the optical axes of two adjacent light sources are the same light line 9 or 10 or Luminous row 22 are each spaced apart by a source spacing A or A ', the light sources of the one luminous line 9 preferably being displaced transversely to the transport direction 6 in order to improve uniform illumination.
  • the light sources are divided into color groups, which differ in the spectrum of the emitted radiation.
  • the radiation from the light sources of a color group encompasses a narrow, coherent spectral range.
  • light-emitting diodes 27, 28 are used as light sources, which are supplied with short-term current pulses which are substantially above an approved permanent limit current, since in this operating mode the light yield of the light-emitting diodes 27, 28 is correspondingly increased and the radiation nevertheless has a narrow spectral range .
  • a variety of color groups are available on the LEDs 27, 28 on the market.
  • the photosensors 4, 4 ' are also positioned equidistantly in their row, a sensor distance B being maintained between the optical axes of two adjacent photosensors 4, 4', but which is a multiple of the source distance A or A '.
  • An acceptance angle ⁇ of the photosensors 4, 4 ′ measured in the sensor plane 5 can be many times larger than the acceptance angle ⁇ .
  • the properties of the optical means 21 (FIG. 1) also determine the acceptance angle ⁇ .
  • the neighboring photosensors 4, 4 'receive light 7 from overlapping sections 29 of the area 8. The same point in the area 8 thus simultaneously sends light 7 into a plurality of photosensors 4, 4', the scattering power of this point, the scattering angle, the distance from the Photosensor 4 or 4 ', etc. are different for each photosensor 4 or 4' and are weighted differently by the device in the photosensors 4, 4 '.
  • the extent to which the cutouts 29 overlap is determined by the acceptance angle ⁇ .
  • This device has the advantage that already in the photosensors 4, 4 'an analog signal processing which is dependent on the predetermined acceptance angles ⁇ and ⁇ , on the distances A and B, on the distribution of the light sources and on the color groups used takes place before the conversion into the electrical sensor signals S and their forwarding via the signal lines 15 to the control unit 13.
  • the acceptance angle ⁇ not only reduces the number of photosensors 4, 4 ′ necessary for recognizing document 1, but also the evaluation time required for recognizing document 1.
  • the mechanical requirements for a precise lateral alignment of the document 1 in the transport channel are lower without sacrificing the security of recognizing the documents 1.
  • the transmission properties of the document 1 can advantageously be influenced by a further series of photosensitive elements, e.g. B. photodetectors 30 are detected, which are arranged on the side of the document 1 facing away from the luminous lines 9, 10 in the sensor plane 5.
  • the row of photodetectors 30 in sensor plane 5 forms an image of the row of photosensors 4, 4 ′ that is mirrored at transport plane 3.
  • a window 31 Arranged in the plate 25, 25 ', at least in the region of the sensor plane 5, is a window 31 which is installed transversely across the width of the transport channel and is transparent to the radiation and which has the width of the region 8 in the transport direction 6.
  • the window 31 consists of a transparent material and is embedded flush in the plate 25, 25 'in order to avoid the accumulation of fibers and the like in the window 31.
  • the optical means 21, which bring about predetermined acceptance angles ⁇ ′, ⁇ ′ of the photodetectors 30, are preferably arranged between the window 31 and the photodetectors 30.
  • the window 31 and the optical Means 21 in front of the photodetectors 30 can be combined as a unit.
  • the signal lines 15 ' connect each photodetector 30 to the control device 13.
  • the electrical sensor signals S of the photodetectors 30 are processed in the control device 13 like those of the photosensors 4, 4' and supplement the group of numbers characterizing the area 8.
  • the row of photosensitive elements 4, 4 ', 30 is preferably shorter than the luminous lines 9, 10 and the luminous row 22, for example on both sides by half a sensor distance B. In the transport channel there is sufficient illumination of the area 8 even for the widest document 1 and the two outermost photosensitive elements 4, 4 ', 30 collect relevant data relating to document 1.
  • the plate 25, 25 ' has two diffusing elements 32 which are covered with a diffuse white scattering medium (e.g. titanium dioxide) and which surround the window 31 in the transport channel.
  • the two scattering elements 32 scatter the light from the luminous lines 11, 12 diffusely into the photosensors 4, 4 '.
  • the measured values obtained from the scattering elements 32 enable the sensitivity of the device, which is changed as a result of aging effects or temperature fluctuations, to be compensated.
  • an entire cycle Z of the clock generator 20 (FIG. 1) is run through and the sensor signals S received from the two scattering elements 32 are stored in the evaluation unit 19 (FIG. 1) as standard number groups, which, for. B. serve as parameters for the gain of each amplifier 13 '( Figure 1) in the control unit 13.
  • the light sources illuminate not only the area 8 but also part of the plate 25, 25 'or the two scattering elements 32. Since when scanning document 1 the number groups with the corresponding standard number groups in of the If the evaluation unit 19 is compared, the area-related proportions of the two illuminated scattering elements 32 and of the area 8 illuminated on the document 1 can be determined.
  • the scattering medium can be arranged on the window 31 as a scattering element 32.
  • the infrared light of the row of lights 22 reaches the photosensors 4, 4 'when measuring the document 1 in transmission through the diffuse scattering medium.
  • a predetermined number of radiation sources 33 are arranged in the light row 22 between the photodetectors 30, the optical axes of which lie in the sensor plane 5 and the area 8 on the side of the document 1 facing away from the light levels 11, 12 illuminate with vertically incident radiation 34 when the radiation sources 33 are fed by the control device 13 via the supply lines 23.
  • the light 7 shining through the document 1 serves as a measure of the transparency of the document 1, is received by the photosensors 4, 4 'and converted into the sensor signals S.
  • the radiation sources 33 of the row of lights 22 installed between two adjacent photodetectors 30 can e.g. B. belong to the same color group, the radiation sources 33 advantageously generating infrared light, the radiation 34 of which is particularly suitable for measuring the transparency.
  • FIG. 3 shows the light line 9 with the light-emitting diodes 27 arranged at the source spacing A.
  • the light-emitting diodes 27 are hatched differently in the drawing according to their emission spectrum. If, for example, the light-emitting diodes 27 belong to the three color groups green, red, yellow, a green, a red and a yellow light-emitting diode 27 follow one another in a first period P1 of the light sources.
  • the subsequent periods P in turn each include a green, one red and one yellow LED 27.
  • the light emitting diodes 27, 28 (FIG. 2) of the same color group in the two light rows 9, 10 (FIG. 2) are simultaneously supplied with energy during a working step t of the clock generator 20 (FIG. 1), so that the area 8 (FIG. 2) is illuminated uniformly in the predetermined color.
  • FIG. 4 shows the light line 9 as an example, the light-emitting diodes 27 of which belong to the color groups infrared, red, yellow or green.
  • the arrangement of the light-emitting diodes 27 of the different color groups in the light line 9 is selected such that the light-weaker light-emitting diodes 27 marked with oblique hatching in the drawing occur correspondingly more frequently in the light line 9 in order to illuminate the area 8 with the same intensity by each color group ensure.
  • the green light-emitting diodes 27 are less bright than yellow, red or infrared with the same power consumption.
  • the green light-emitting diodes 27 with the oblique hatching are arranged between two different light-emitting diodes 27 from the three other color groups.
  • the first period P1 of the light emitting diodes 27 comprises z. B. the colors infrared-green-yellow-green-red-green, which are followed by the next similar periods P.
  • the periods P of the light lines 9, 10 or light line 22 can be out of phase with one another.
  • the beam optics 21 ′ are advantageously arranged between the light-emitting diodes 27 and the plate 25, which causes a uniform distribution of the light intensity in the area 8 (FIG. 1) of the document 1, although the light is generated with many almost point-shaped light sources of the same color group.
  • the optically diffractive element is preferably used as beam optics 21 ', since its optical properties, which are dependent on the wavelength of the light beams 35, can be optimally adapted to the spatial distribution of the light-emitting diodes 27 of the different color groups.
  • FIG. 5 shows in connection with FIG. 1 a temporal course of the supply voltage U 0 on the control line 16, the supply voltages U 1 to U 3 on the supply lines 14 or supply lines 23 and the sensor signal S on one of the signal lines 15, 15 ' ( Figure 2).
  • the drive 17 for shifting the document 1 is switched on, in the following three working steps t of the cycle Z the supply voltages U 1 to U 3 are emitted to the light sources of the three color groups in a staggered manner in time.
  • the next cycle Z then follows.
  • the sensor signal S follows the intensity of the light 7, the relative height H of the sensor signal S being dependent on the local reflectivity or transmission of the document 1 in the light of the respective color group.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Image Input (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Character Input (AREA)

Claims (10)

  1. Dispositif pour la reconnaissance optique de documents (1), comprenant au moins une rangée d'éléments photoélectriques (4 ; 4' ; 30), disposés régulièrement sur toute la largeur du document (1) et qui reçoivent la lumière dans une direction définie par un plan de capteurs (5) perpendiculaire à une surface de transport (3) du document (1) , lesquels sont destinés à recevoir la lumière (7) modifiée par le document (1), et comprenant au moins un plan d'émission de lumière (11 ; 12), incliné par rapport au plan des capteurs (5) et à la surface de transport (3), lequel est destiné à illuminer une zone (8) du document (1) définie par le plan des capteurs (5), le plan d'émission de lumière (11 ; 12) contenant des sources lumineuses (27 ; 28), disposées dans une ligne de lumière (9 ; 10), et comprenant des organes (13, 13', 20 ; 19) destinés à commander les sources lumineuses (24 ; 27 ; 28 ; 33) et à traiter les signaux émis par les capteurs, caractérisé en ce que des sources lumineuses (27 ; 28), contiguës les unes aux autres dans chaque ligne de lumière (9 ; 10), sont situées les unes par rapport aux autres à une distance (A) inférieure à la distance (B) entre les éléments photoélectriques (4 ; 4' ; 30), contigus les uns aux autres, en ce que les sources lumineuses (24 ; 27 ; 28 ; 33) sont conçues pour produire de la lumière à partir d'un domaine spectral étroit, les sources lumineuses avec le même domaine spectral appartenant à l'un des différents groupes de couleurs, et en ce que les éléments photoélectriques (4 ; 4' ; 30) forment un premier angle d'acceptance (α), perpendiculairement au seul plan de capteurs (5), et un deuxième angle d'acceptance (β) dans le plan des capteurs (5), le premier angle d'acceptance (α) définissant la largeur de la zone (8) et le deuxième angle d'acceptance (β) déterminant un recouvrement des sections (29) de la zone (8).
  2. Dispositif selon la revendication 1, caractérisé en ce que les capteurs photoélectriques (4 ; 4') sont disposés dans le plan des capteurs (5), au-dessus de la zone illuminée (8) et sur le côté du document (1) face aux plans d'émission de lumière (11 ; 12).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que des détecteurs photoélectriques (30) sont disposés dans le plan des capteurs (5), sur le côté du document (1) opposé aux plans d'émission de lumière (11 ; 12).
  4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que des sources de rayonnement (33), constituant d'autres sources lumineuses, sont disposées dans le plan des capteurs (5) sur le côté du document (1) opposé aux plans d'émission de lumière (11 ; 12) et en ce que le document (1) peut être illuminé des deux côtés dans la zone (8).
  5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'appareil de commande (13) est équipé pour connecter et déconnecter par cycles les sources lumineuses (24 ; 27 ; 28 ; 33) et pour recevoir de manière synchrone les signaux émis par les capteurs à cet effet, un seul groupe de couleurs des sources lumineuses (24 ; 27 ; 28 ; 33) étant toujours connecté au même moment, de telle sorte que la zone (8) peut être balayée successivement par la lumière provenant de plusieurs domaines spectraux au cours de plusieurs étapes de travail (t) d'un synchroniseur (20), monté dans l'appareil de commande (13).
  6. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les lignes de lumière (9 ; 10) contiennent les sources lumineuses d'au moins trois groupes de couleurs, en ce que l'appareil de commande (13) est équipé pour connecter et déconnecter par cycles toutes les sources lumineuses (24 ; 27 ; 28 ; 33) d'un groupe de couleurs et pour recevoir de manière synchrone les signaux provenant des éléments photoélectriques (4 ; 4' ; 30) et émis par les capteurs à cet effet, et en ce que les sources lumineuses des groupes de couleurs sont disposées en alternance périodique dans les lignes de lumière (9 ; 10).
  7. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les lignes de lumière (9 ; 10) contiennent les sources lumineuses d'au moins trois groupes de couleurs, en ce que l'appareil de commande (13) est équipé pour connecter et déconnecter par cycles toutes les sources lumineuses (24 ; 27 ; 28 ; 33) d'un groupe de couleurs et pour recevoir de manière synchrone les signaux provenant des éléments photoélectriques (4 ; 4' ; 30) et émis par les capteurs à cet effet, en ce que, pour illuminer régulièrement la zone (8), le nombre de sources lumineuses de chaque groupe de couleurs dépend de l'intensité lumineuse produite par ces sources lumineuses et en ce que les sources lumineuses des groupes de couleurs sont disposées périodiquement dans les lignes de lumière (9 ; 10).
  8. Dispositif selon l'une quelconque des revendications 5 à 7, caractérisé en ce qu'au moins une source de lumière ultraviolette (24), constituant la source lumineuse destinée à illuminer la zone (8) avec la lumière ultraviolette, est disposée entre le document (1) et les éléments photoélectriques (4 ; 4' ; 30) à l'extérieur du plan des capteurs (5), parallèlement au plan de transport (3).
  9. Dispositif selon la revendication 1, caractérisé en ce que des organes optiques (21) sont disposés devant les éléments photoélectriques (4 ; 4' ; 30) pour former les angles d'acceptance (α ; β).
  10. Dispositif selon la revendication 1, caractérisé en ce qu'une optique de Newton (21' ; 21" ; 21'") est disposée devant les sources lumineuses (24 ; 27 ; 28 ; 33) pour mieux illuminer la zone la zone (8).
EP92113171A 1991-10-14 1992-08-03 Dispositif pour la reconnaissance optique de documents Expired - Lifetime EP0537431B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH300591 1991-10-14
CH3005/91 1991-10-14

Publications (2)

Publication Number Publication Date
EP0537431A1 EP0537431A1 (fr) 1993-04-21
EP0537431B1 true EP0537431B1 (fr) 1997-05-28

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EP92113171A Expired - Lifetime EP0537431B1 (fr) 1991-10-14 1992-08-03 Dispositif pour la reconnaissance optique de documents

Country Status (8)

Country Link
US (2) US5304813A (fr)
EP (1) EP0537431B1 (fr)
JP (1) JP3152372B2 (fr)
DE (1) DE59208542D1 (fr)
ES (1) ES2103330T3 (fr)
FI (1) FI924620A (fr)
HK (1) HK1007019A1 (fr)
NO (1) NO923966L (fr)

Cited By (1)

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EP1587030A1 (fr) * 2003-01-23 2005-10-19 Aruze Corp. Capteur d'identification

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US5498879A (en) 1996-03-12
NO923966L (no) 1993-04-15
US5304813A (en) 1994-04-19
ES2103330T3 (es) 1997-09-16
HK1007019A1 (en) 1999-03-26
NO923966D0 (no) 1992-10-13
JPH05282432A (ja) 1993-10-29
DE59208542D1 (de) 1997-07-03
FI924620A0 (fi) 1992-10-13
JP3152372B2 (ja) 2001-04-03
FI924620A (fi) 1993-04-15
EP0537431A1 (fr) 1993-04-21

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