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WO1997031340A1 - Agencement de detection de reflection optique pour dispositifs d'analyse - Google Patents

Agencement de detection de reflection optique pour dispositifs d'analyse Download PDF

Info

Publication number
WO1997031340A1
WO1997031340A1 PCT/CA1997/000104 CA9700104W WO9731340A1 WO 1997031340 A1 WO1997031340 A1 WO 1997031340A1 CA 9700104 W CA9700104 W CA 9700104W WO 9731340 A1 WO9731340 A1 WO 9731340A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiation
substrate
arrangement
photo sensor
optical
Prior art date
Application number
PCT/CA1997/000104
Other languages
English (en)
Inventor
Vitold A. Khvostov
Original Assignee
Cashcode Company Inc.
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 Cashcode Company Inc. filed Critical Cashcode Company Inc.
Priority to AU15872/97A priority Critical patent/AU1587297A/en
Publication of WO1997031340A1 publication Critical patent/WO1997031340A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10554—Moving beam scanning
    • G06K7/10564—Light sources
    • G06K7/10574—Multiple sources
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10554—Moving beam scanning
    • G06K7/10564—Light sources
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10712—Fixed beam scanning
    • G06K7/10762—Relative movement

Definitions

  • TITLE OPTICAL REFLECTION SENSING ARRANGEMENT FOR SCANNING EVICES
  • the present invention relates to optical scanning arrangements and in particular relates to optical scanning arrangements where a substrate is scanned by two different radiation sources.
  • a host of optical scanning arrangements are known where light from an LED or other source is directed to a bank note or other substrate which reflects the light and the reflected light is measured by a sensor.
  • the sensor produces electrical pulses according to the reflected light.
  • surfaces are scanned to determine whether the particular surface is authentic.
  • the substrate is scanned by two different light sources at different wavelengths and various tests can be carried out comparing the signal due to a predetermined relationship of the reflecting characteristics of the substrate to the two different types of radiation.
  • One of the problems with sensing arrangements of this type is fluctuations in the intensity level of the reflected radiation due to changing positions of the substrate relative to the emitter and sensor.
  • the substrate such as a bank note, debit card or other substrate
  • This guideway has tolerances, and thus, the separation between the substrate and the sensing arrangement can vary.
  • there can be changes in the angle of the substrate within the guideway which can also affect the intensity level of the reflected radiation from the substrate.
  • Problems of this type are compounded by sensing arrangements which use two different wavelengths of radiation, as changes in position do not always cause a similar change in each of the two systems even where the systems share the same photo sensor.
  • An arrangement for scanning a substrate as it is moved through a scanning region comprises a light emitter which emits radiation, an optical lens which processes the emitted radiation to form a distributed band of radiation having a similar direction and intensity within the distributed band, a guideway for receiving a substrate to be scanned, the guideway being orientated relative to the distributed band of radiation to move the substrate through the band of radiation illuminating a strip of the substrate to the radiation, the radiation striking the substrate at a generally acute angle and causing the substrate to reflect the radiation according to the characteristics of the substrate with the reflected radiation being sensed by a photo sensor.
  • the photo sensor is generally isolated from directly receiving radiation from the light emitter and only receives radiation from a portion of the illuminated strip.
  • the location of the portion of the illuminated strip changes as changes in the separation distance of the substrate and the sensor occur due to tolerances of the guideway while the radiating areas of the portion remains generally constant.
  • changes in the separation, distance or the angle of the substrate within the guideway itself does not appreciably affect the amount of sensed radiation, as the radiation has been processed to form a distributed band of generally constant distribution and intensity and only using a portion of this distributed band for receipt by the photo sensor.
  • Changes in position change the position of the portion of the radiation which is used, however, the net effect remains much more consistent.
  • a second optical lens which focuses the distributed band of radiation prior to striking the substrate to effectively narrow the width of the distributed band.
  • the photo sensor has an associated optical focusing arrangement located to focus reflected radiation from the portion of the distributed band onto the photo sensor.
  • the second optical lens and the associated optical focusing arrangement of the photo sensor are integral.
  • An arrangement for scanning a substrate as it is moved through a scanning region includes an optical arrangement comprising a first light emitter which emits radiation at a first wavelength, a second light emitter which emits radiation at a second wavelength, an optical lens for each emitter which processes the emitted radiation to form a common distributed band of radiation where the radiation from each emitter has a similar direction and intensity within the distributed band and the intensity within the distributed band for the respective wavelengths are generally known and related in a fixed manner.
  • a guideway receives a substrate to be scanned and allows movement of the substrate through the guideway.
  • the guideway is orientated relative to the distributed band to move the substrate through the distributed band exposing a strip of the substrate to radiation from each emitter which impinges on the substrate at an acute angle and causes the substrate to reflect according to the characteristics of the substrate, which reflected radiation is sensed by a photo sensor.
  • the radiation sensor is generally isolated from directly receiving radiation from the light emitters and only receives radiation from a portion of the distributed strip.
  • the location of the portion of the narrow strip changes as changes in the separation distance of the substrate and the sensor occur due to tolerances of the guideway, while the radiating area of the portion remains generally constant. With this arrangement, the distributed radiation minimizes the anticipated changes of the position of the substrate within the guideway. Increased accuracy is obtained as there are less fluctuations in the measured intensity and changes occur generally equally to both systems.
  • Figure 1 is a partial side view showing the optical sensing arrangement and the substrate to be scanned
  • Figure 2 is a view of Figure 1 taken along line A-A;
  • Figure 3 is a top view taken along line B-B of Figure 2;
  • Figure 4 is a view of the arrangement showing the field of view of the sensor
  • Figure 5 shows the side view of Figure 4.
  • Figure 6 illustrates the processing of the radiation from an LED to produce the desired radiation field on the substrate
  • Figure 7 is a side view of the processing arrangement
  • Figure 8 is an enlarged view of the angled rear surface of the optical lens arrangement having a series of angled surfaces.
  • the optical reflection sensing arrangement 20 scans a substrate, generally shown as 1, as it passes through the guideway 22.
  • the direction of travel of the substrate is indicated as 24. With this movement, a narrow band of the substrate is exposed behind the thick cylindrical lens shown as 2.
  • the optical reflection sensing arrangement 20 includes a first LED 4 which emits radiation of a first wavelength and a second LED, generally shown as 6, which emits radiation of a different wavelength. These LED's are aligned across the direction of t el 24 and a photo sensor 5 is located between the LED's. Blinds 7 are provided either side of the photo sensor such that direct radiation from either of the LED's cannot impinge upon the photo sensor 5. Emitted light radiation from each LED is generally spherical, however, a complex optical lens 3 is provided in front of the LED's and processes the radiation in a particular manner.
  • Figure 6 clearly shows how the emitted radiation, generally shown as 26, strikes the series of angled surfaces, generally shown as 14, and cause deflection of the emitted radiation producing the distributed radiation field, generally shown as 28.
  • This radiation field has radiation of a similar angle and has distributed the radiation in a particular manner to provide more even intensity distribution along the exposed portion of the substrate, generally indicated as 30.
  • a second lens this being the thick cylindrical lens 2 receives this radiation and as shown as Figure 7, again focuses the band of radiation into an area of reduced width. This is generally shown at position 32 in Figure 7.
  • the radiation emitted by the LED 4 is similarly treated, however, it is angled in the opposite direction, and thus, exposes a similar area 30 on the substrate.
  • the radiation from each of the LED's has been distributed in a particular manner and has been focused to expose a band on the substrate to the radiation.
  • the intensity of the radiation over the distributed area 30 is similar.
  • the complex optical lens 3 includes a center section, generally shown as 36, which receives the radiation reflected from the substrate. It receives radiation from the substrate of the wavelength of the radiation from the LED 4 as well as of the wavelength of the radiation from the LED 6.
  • the reflected radiation is generally shown in Figures 4 and 5 where the reflected radiation, indicated as 42, is focused by lens 2 and is focused a second time by the optical component 37 provided in front of the photo sensor 5. This tends to concentrate the reflected radiation on the photo sensor and generally regroups the distributed radiation.
  • the position of the substrate 1 within the guideway 22 is subject to tolerance variations and this would normally lead to substantial changes in the intensity of the sensed radiation.
  • the photo sensor 5 only views a limited portion of the band on the substrate and changes in position of the substrate merely alter the part of the band from reflected radiation is received by photo sensor 5. Changes in position affect both systems in a similar manner.
  • the photo sensor is not as subject to wide variations in the intensity due to changes in the separation distance due to the distribution of the radiation on the substrate and the fact that the LED's produce overlapping bands of distributed radiation, and thus, changes in position are not as critical.
  • the optical reflection sensing arrangement has two identical illuminating system and one photo sensor. These identical illuminating systems and the photo sensor share certain optical elements. With this arrangement, identical fields of vision in both spectral bands is possible and improved independence of the signal from the distance between the substrate and the sensor is achieved.
  • the lighting distribution from each LED provides a particular form of distributed radiation and the distribution of the lighting from each of the LED's is similar. In this way, consistency between the effects of the radiation of each LED is possible and greatly improved with respect to prior art structures.
  • the solution presented in the present case is a combination of using a field of vision of the photo sensor which is relatively low while illuminating areas which are relatively large to provide sufficient uniform field of vision lighting from each LED.
  • the limited field of vision of the photo sensor is the result of focusing of the photosensitive area of the photo sensor on the bank note surface in the meridian perpendicular to the alignment line of the optical devices.
  • the original divergence angle of the field of vision is limited in the other meridian via opaque blinds 7.
  • the focusing is achieved with two cylindrical surfaces, these being the upper part of the lens 2 and the center of the lower surface of the complex optical lens 3.
  • Some narrowing of the field of vision in the plane of the bank note caused by blind 7 can be made for by the cylindrical form of the optical part 3 facing the photo sensor surface.
  • This cylindrical form can either be concave or convex, depending upon whether the use of the usage of the blinds result in smaller or larger lengths of field of vision as compared with the target value.
  • the whole field of vision of the photo sensor is evenly illuminated, and thus, the sensor range of sensing equals the field of vision.
  • the field of vision is somewhat widened in one meridian because of the defocusing and alternately shrinks or expands in the other meridian because of the divergence of the border beams of the field of vision.
  • the photo sensor field of vision is evenly illuminated, as it is basically scanning a smaller area and any changes in position still result in the same area being scanned and this area having the same even illumination.
  • the degree of illumination tends to increase with a bank note coming closer and decreases when the bank note moves away as a result of the divergence of the light beam in one of the meridians.
  • the focusing of the beam in the other meridian is performed in a manner to make the beam shrink when the bank note moves away.
  • the illuminant in this meridian is focused, not on the bank note surface, but on the surface located much further from the sensor.
  • the particular location of the focusing surface is brought into conformity with the divergence to maintain the illumination in the working area more or less stable.
  • Different LED's may require different optical strengths of the total cylindrical optics. This value varies with the variation of curvature of the lower farthest cylindrical surface of part 3 , as shown in Figure 3, where the lower surface of this part is shown.
  • This principle of focusing simultaneously creates a relatively larger area of illumination, which is desired to keep the field of vision of the photo sensor evenly illuminated.
  • the upper furthest surface of part 3 is a raster performing a number of functions at a time, these including deflecting the beams emitted by the LED in the direction of the illuminated area on the bank note, and correcting the energy distribution across the bank note surface in the meridian.
  • the surface is provided with a number of teeth 14. Their working surfaces and set angles are selected depending on the nature of the original beams of the different LED's and the target characteristics of the system as a whole, such as dimensions, field of vision, etc.
  • the cylindrical lens 2 has an upper surface which focuses the light fluxes from the LED's and focuses the reflected light from the substrate.
  • the lower flat surface is to plug a hole in the bank note guide. The usage of separate parts for focusing and plugging could lead to a dramatic increase in the light diffusion in the sensor.
  • the complex optical lens 3 has six independent surface areas. These surface areas include the two tooth- profiled sections which turn the light fluxes around and place them along the illuminated part of the bank note surface, a left lower area and a right lower area which are cylindrical in shape, but can be of other shapes to ensure the correct positioning of the focusing plane of the illuminant of the LED's, and an upper central area which is cylindrical in shape with its axis perpendicular to the line along which all the optical devices are arranged. This upper central area can also be flat. This surface largely determines the length of the field of vision of the photo sensor. The lower central area is cylindrical in shape with its axis parallel to the line along which the optical devices are arranged. This surface ensures the right location of the focusing plane of the photosensitive area of the sensor.
  • the present optical reflection sensing arrangement reduces variations in intensity and variations in position of the substrate being scanned associated with other scanning arrangements.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'analyseur optique utilise un système optique à un composé pour traiter un rayonnement réfléchi de manière à réduire les variations provoquées par la position changeante d'un substrat analysé dans une voie de guidage. Deux sources de rayonnement sont orientées à des angles similaires par rapport à la surface à passer au crible et le rayonnement est réparti sur une surface plus grande. Les changements de position du substrat dans la voie de guidage changent la surface effective réfléchissant le rayonnement détecté par le détecteur, mais la taille de la surface réfléchissante ne change pas sensiblement. Tout changement affecte les deux systèmes de rayonnement de manière similaire.
PCT/CA1997/000104 1996-02-20 1997-02-14 Agencement de detection de reflection optique pour dispositifs d'analyse WO1997031340A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15872/97A AU1587297A (en) 1996-02-20 1997-02-14 Optical reflection sensing arrangement for scanning devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,169,865 1996-02-20
CA002169865A CA2169865C (fr) 1996-02-20 1996-02-20 Detecteur de rayons lumineux reflechis pour dispositifs de balayage

Publications (1)

Publication Number Publication Date
WO1997031340A1 true WO1997031340A1 (fr) 1997-08-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1997/000104 WO1997031340A1 (fr) 1996-02-20 1997-02-14 Agencement de detection de reflection optique pour dispositifs d'analyse

Country Status (3)

Country Link
AU (1) AU1587297A (fr)
CA (1) CA2169865C (fr)
WO (1) WO1997031340A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257389B1 (en) * 1998-02-05 2001-07-10 Ascom Autelca Ag Device for examining securities
WO2002075672A1 (fr) * 2001-03-19 2002-09-26 De La Rue International Limited Ensemble pour détecter des feuilles et procédé associé
WO2004027719A1 (fr) * 2002-09-17 2004-04-01 O.R.M.A.G. S.P.A. Systeme d'inspection pour supports de securite
WO2004107278A1 (fr) * 2003-05-30 2004-12-09 Astrosys International Ltd Identification et validation de billets
US7075663B2 (en) 1998-10-30 2006-07-11 Datalogic, S.P.A. Optical device and a method for aiming and visually indicating a reading area
WO2011072864A1 (fr) * 2009-12-18 2011-06-23 Giesecke & Devrient Gmbh Détecteur pour vérifier des documents de valeur
WO2011072862A1 (fr) * 2009-12-18 2011-06-23 Giesecke & Devrient Gmbh Capteur pour vérifier des documents de valeur
CN113728245A (zh) * 2019-02-04 2021-11-30 光子控制器有限公司 薄型光学传感器

Citations (7)

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Publication number Priority date Publication date Assignee Title
GB1470737A (en) * 1974-07-04 1977-04-21 Landis & Gyr Ag Value token testing apparatus
JPS5999237A (ja) * 1982-11-29 1984-06-07 Kita Denshi:Kk 印刷面監視センサ−
GB2225659A (en) * 1988-11-18 1990-06-06 West Electric Co Optical bar-code reader
WO1991011778A1 (fr) * 1990-02-05 1991-08-08 Cummins-Allison Corp. Methode et appareil permettant d'identifier et de compter des billets dans diverses monnaies
EP0537513A1 (fr) * 1991-10-15 1993-04-21 URMET S.p.A. Costruzioni Elettro-Telefoniche Appareil de validation de billets de banque
US5304813A (en) * 1991-10-14 1994-04-19 Landis & Gyr Betriebs Ag Apparatus for the optical recognition of documents
EP0660277A2 (fr) * 1993-12-27 1995-06-28 Azkoyen Industrial, S.A. Méthode et dispositif pour la caractérisation et la différenciation de billets de banque et documents légaux

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1470737A (en) * 1974-07-04 1977-04-21 Landis & Gyr Ag Value token testing apparatus
JPS5999237A (ja) * 1982-11-29 1984-06-07 Kita Denshi:Kk 印刷面監視センサ−
GB2225659A (en) * 1988-11-18 1990-06-06 West Electric Co Optical bar-code reader
WO1991011778A1 (fr) * 1990-02-05 1991-08-08 Cummins-Allison Corp. Methode et appareil permettant d'identifier et de compter des billets dans diverses monnaies
US5304813A (en) * 1991-10-14 1994-04-19 Landis & Gyr Betriebs Ag Apparatus for the optical recognition of documents
EP0537513A1 (fr) * 1991-10-15 1993-04-21 URMET S.p.A. Costruzioni Elettro-Telefoniche Appareil de validation de billets de banque
EP0660277A2 (fr) * 1993-12-27 1995-06-28 Azkoyen Industrial, S.A. Méthode et dispositif pour la caractérisation et la différenciation de billets de banque et documents légaux

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257389B1 (en) * 1998-02-05 2001-07-10 Ascom Autelca Ag Device for examining securities
US7075663B2 (en) 1998-10-30 2006-07-11 Datalogic, S.P.A. Optical device and a method for aiming and visually indicating a reading area
WO2002075672A1 (fr) * 2001-03-19 2002-09-26 De La Rue International Limited Ensemble pour détecter des feuilles et procédé associé
EP1248224A3 (fr) * 2001-03-19 2003-07-09 De La Rue International Limited Dispositif et méthode pour détecter des feuilles
US7423738B2 (en) 2002-09-17 2008-09-09 Officina Riparazioni Macchine Grafiche-O.R.M.A.G.-S.P.A. Inspecting system for security documents
WO2004027719A1 (fr) * 2002-09-17 2004-04-01 O.R.M.A.G. S.P.A. Systeme d'inspection pour supports de securite
WO2004107278A1 (fr) * 2003-05-30 2004-12-09 Astrosys International Ltd Identification et validation de billets
WO2011072864A1 (fr) * 2009-12-18 2011-06-23 Giesecke & Devrient Gmbh Détecteur pour vérifier des documents de valeur
WO2011072862A1 (fr) * 2009-12-18 2011-06-23 Giesecke & Devrient Gmbh Capteur pour vérifier des documents de valeur
US20120247917A1 (en) * 2009-12-18 2012-10-04 Jorg Frankenberger Sensor for checking value documents
JP2013514566A (ja) * 2009-12-18 2013-04-25 ギーゼッケ ウント デフリエント ゲーエムベーハー 有価証券類を検査するためのセンサ
US8662278B2 (en) 2009-12-18 2014-03-04 Giesecke & Devrient Gmbh Sensor for checking value documents
US8749768B2 (en) 2009-12-18 2014-06-10 Giesecke & Devrient Gmbh Sensor for checking value documents
KR101841301B1 (ko) * 2009-12-18 2018-03-22 기제케＋데브리엔트 커런시 테크놀로지 게엠베하 가치 문서의 체크를 위한 센서
CN113728245A (zh) * 2019-02-04 2021-11-30 光子控制器有限公司 薄型光学传感器

Also Published As

Publication number Publication date
AU1587297A (en) 1997-09-10
CA2169865A1 (fr) 1997-08-21
CA2169865C (fr) 2007-07-03

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