EP1067485B1 - Procede et appareil pour la validation et la caracterisation des pieces de monnaie - Google Patents

Procede et appareil pour la validation et la caracterisation des pieces de monnaie Download PDF

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Publication number
EP1067485B1
EP1067485B1 EP99961074A EP99961074A EP1067485B1 EP 1067485 B1 EP1067485 B1 EP 1067485B1 EP 99961074 A EP99961074 A EP 99961074A EP 99961074 A EP99961074 A EP 99961074A EP 1067485 B1 EP1067485 B1 EP 1067485B1
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EP
European Patent Office
Prior art keywords
coin
edge
light
sensor
rolling track
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99961074A
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German (de)
English (en)
Spanish (es)
Other versions
EP1067485A1 (fr
Inventor
Eugenio Guelbenzu Michelena
Jose Tornos Gimeno
Manuel Quintanilla Monton
Jesus Atencia Carrizo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Azkoyen Medios de Pago SA
Original Assignee
Azkoyen Medios de Pago SA
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Publication date
Application filed by Azkoyen Medios de Pago SA filed Critical Azkoyen Medios de Pago SA
Publication of EP1067485A1 publication Critical patent/EP1067485A1/fr
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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
    • G07D5/10—Testing the rim, e.g. the milling of the rim

Definitions

  • the present invention relates to a method for validation and characterisation of coins by examining the relief on the coin edge.
  • the invention also includes the apparatus used to carry out the validation and characterisation.
  • the method and apparatus of the invention obtain an electrical signal which is characteristic of the existence or absence of relief and also of the type of relief present in the coin edge, where by relief is meant both recesses and embossing present in the edge, in whichever configuration they are present, such as ribs, grooves, etc.
  • Document WO 91/06072 discloses a apparatus which analyses the knurling of coin edges by illuminating an arc of the coin. The reflected light is focused on a sensor by a lens. On the detector is placed a grid-like mask with an image engraved similar to that of the valid coin. If the periodicity of the mask and the coin knurling coincide a modulated signal is produced which is used to recognise the coin.
  • This procedure has the disadvantage that the analysis of the coin takes place in a small spatial area which matches the circular sector of the coin edge when it is placed opposite the optical axis of the lens. Additionally, only part of the image obtained is properly focused, since the focal plane will only lie on a relatively small area of the coin edge because of its curvature.
  • a further inconvenient of the apparatus described is that it is only valid for detecting a knurl which matches that of the mask employed.
  • Document DE 3711941 (Standard Elektrik Lorenz) describes a apparatus for lateral verification of coins where the coin is illuminated from the bottom, from near the rolling track. Before reaching the coin the beam of light is focused, so that it is incident on a small area of the coin edge. The receptor is placed embedded in the bottom of the rolling track so that it receives the light reflected from the edge of the coin when it is near said sensor.
  • This system as the previous one, has the disadvantage that the coin can only be analysed over a small area of its path because of the location and geometry used for the emitter and receiver set. Additionally, the emitted beam can only be focused on a small range of distances.
  • Belgian Patent BE 861396 employs an optical procedure for discriminating coins having different edges. It can differentiate grooved coins from flat or polygonal coins.
  • the apparatus relies on illuminating the coin edge with a photodiode and detecting the level of light reflected by the coin. For a flat coin the reflected light is different than for that obtained from a grooved coin. It is also different if the coin is polygonal, in which case more than one light impulse is produced.
  • the device and procedure described does not allow a detailed analysis of the coin edge, since it can only measure the total amount of light reflected by a coin, so that coins with different grooves may produce similar reflection levels, or two different results may be obtained for identical coins in a different state of conservation (different shine).
  • the object of the present invention is a method and an apparatus which allow to obtain information on the edge of the coin which is independent of the shine or conservation state.
  • the invention provides a signal characteristic of the relief (hereunder grooves) of the coin edge, so that for example, the number of grooves of the coin in a certain segment can be found, the spacing between grooves, the type of grooves (continuous or staggered) or if the coin is smooth.
  • size characteristics of the grooves may be obtained, such as the size of the grooves, separation between grooves and uniformity of the groves.
  • the invention refers to a method and apparatus for coin validation and characterisation according to claims 1 and 6, respectively
  • the light emitter which illuminates the coin edge and the receiver for the light reflected by said edge are arranged with respect to each other so that the receiver receives only the diffuse reflection caused by the grooves of the edge surface, but not the specular reflection caused by the smooth area of the edge which lack relief.
  • relief is meant both recesses and embossing of the edge, and in general any geometrical alteration of its surface.
  • the width of the illuminating beam must be equal to or smaller than the size of the grooves.
  • the light arriving from the emitter is preferably passed through a silt, producing a rectangular beam which reaches the coin edge along a band parallel to the edge of the coin which encompasses the entire extension of said edge and has a width equal to or smaller than the thickness of the groves or geometrical alterations of said coin edges.
  • the light beam In order to prolong the measurement for a distance sufficient to examine a significant area of the coin periphery, the light beam must maintain its properties constant along its entire path, so that a collimated beam should be used.
  • the beam which illuminates the edge of the coins should be substantially parallel to the rolling plane of the coin, or form a small angle with it and is incident on the edge of the coins at a certain height above the rolling track, higher than the radius of said coins.
  • the apparatus for performing the procedure of the invention comprises a collimated light emitter which generates a light beam parallel or at a small angle to the rolling track of the coin; a wall or screen which is placed between the light emitter and the coin and is provided with a slit which allows a rectangular beam to pass which illuminates the entire width of the coin edge; and a sensor receiver of reflected light placed so that it can only receive diffuse light reflected from the coin edge and not light reflected specularly by said edge. This property allows the sensor receiver to be placed near the emitter.
  • Figure 1 shows a coin (1) rolling along a rolling track (2).
  • the edge of the coin is illuminated by an emitter (3), preferably consisting of a laser diode, which emits a light (4) which passes through a slit (5) producing a beam (6) of rectangular outline which will incide on the edge of coin (1).
  • an emitter (3) preferably consisting of a laser diode, which emits a light (4) which passes through a slit (5) producing a beam (6) of rectangular outline which will incide on the edge of coin (1).
  • Figure 3 shows in greater detail slit (5) through which passes light (4) produced by emitter (3), obtaining a rectangular shaped beam (6) which, as seen in figure 4 , incides on the edge of the coin along a band parallel to the first axis of said coin, with the length of this band preferably greater than the thickness of the edge of coin (1) and its width equal to or smaller than the width of the geometrical alterations or grooves (8) of the edge of coin (1) which are to be measured.
  • FIG. 1 The basic installation shown in figure 1 is completed with a receiver (9) for light (10) reflected by the edge of coin (1).
  • the method of the invention tries to avoid light reflected specularly by the edge of coin (1) from reaching receiver (1), which consists of a suitable receiver.
  • the edge of coin (1) is illuminated at an angle substantially parallel to the rolling track (2) of coin (1), so that beam (6) incides on said edge above the centre of the coin.
  • detector (9) will only receive diffuse reflection (11)produced by the striations or geometrical alterations of the coin edge, while specular reflection (12) due to the smooth areas of the coin edge, does not reach detector (9).
  • receiver (9) When illuminating beam (6) is strictly parallel to the rolling ramp (2), receiver (9) will provide a signal with an amplitude growing as coin (1) nears the receiver (inverse square law).
  • Emitter (3) shall be a semiconductor laser, visible or infrared, with a collimated light output.
  • these type of devices provide an elliptical section beam, which is not a problem for this application since a rectangular beam is desired. In any case, this is achieved, as described above, by interposing between emitter (3) and coin (1) a slit (5) of dimensions suitable to form the desired beam (6), as already described, with the longer side coinciding with the major axis of the beam's elliptical section.
  • the slit (5) may be placed near emitter (3), thus allowing a compact and small assembly.
  • the optimal dimensions for slit (5) are set for its length by the maximum thickness of the coin to be measured, which may be estimated at around 3 mm.
  • the height of slit (5) this is set on one hand by the fineness of detail required or by the smallest grooves which need to be identified, and on the other hand by the diffraction effect which appears when the slit is excessively thin. It has been found that a slit height between 0.2 and 0.4 mm may be suitable for most commonly used coins with tolerable diffraction from red to near infrared bands.
  • receiver (9) is mounted so that it does not sense light (12) specularly reflected by the coin, but so that it does receive diffuse light (11) reflected by the relief of said coin.
  • Figures 5 to 8 show the signals provided by receiver (9) for different types of relief on a con edge. When the coin has no relief the detector will provide a virtually null signal.
  • Figure 5 shows the signal obtained when inserting a coin with a 'Spanish flower' type edge, which consists of curved notches separated by a distance several times greater than the size of said notch. As seen, impulses separated by signal-free intervals appear, which correspond to the incisions and to the smooth areas of the coin edge respectively.
  • Figure 6 corresponds to the signal obtained by a sample coin similar to the future 1 Euro coin, which shows a fine striation interrupted by smooth areas.
  • impulses are seen clearly which correspond to the striations of the coin edge, but the separation between impulses and their duration is clearly smaller as the grooves are much thinner.
  • Figure 7 shows a coin with a uniform striation, which shows impulses with duration and separation between them substantially constant. However, a 'compression' of the signal is appreciable from left to right, which is due to the acceleration of the coin as it rolls on an inclined plane, as shown in figure 1 .
  • figure 8 shows the signal which appears for a coin which in addition to a uniform striation presents uniformly distributed figures.
  • impulses representative of the striation also appear, but with their amplitude modulated by the signal produced by said motifs.
  • impulses in a certain spatial or time interval can be counted, duration of the impulses and their separation may be measured, or the amplitude and frequency of these impulses may be measured.
  • the device disclosed can be completed with known systems for measuring the coin diameter, such as that described in Patent ES 557 523 in the name of the present applicants, consisting of optical sensors (13) which in addition to its size (chord intercepted by the optical sensors) can provide the average speed of the entering and exiting coin sides and its acceleration.
  • optical sensors (13) which in addition to its size (chord intercepted by the optical sensors) can provide the average speed of the entering and exiting coin sides and its acceleration.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)

Abstract

Le procédé selon l'invention consiste à éclairer partiellement la tranche de la pièce de monnaie (1) à l'aide d'un faisceau lumineux collimaté (6) de section rectangulaire. Ce faisceau atteint la tranche de la pièce en formant une frange parallèle à l'axe de ladite pièce, et dont la largeur est inférieure ou égale à l'épaisseur des altérations devant être détectées. Un capteur (9) est prévu pour détecter la lumière reflétée de telle sorte qu'il ne capte que la lumière diffusée (11) émise par le relief ou les altérations de la surface de la tranche de la pièce, mais ne capte pas la réflexion spéculaire (12) générée par les zones lisses de cette tranche.

Claims (10)

  1. Procédé pour la validation et la caractérisation des pièces de monnaie comprenant l'éclairage partiel du bord de la pièce de monnaie (1) au cours de son roulement sur une piste de roulement et l'analyse de la lumière réfléchie par ledit bord au moyen d'un capteur (9), caractérisé en ce que le bord de la pièce de monnaie est éclairé par un faisceau de lumière collimatée (6) qui est parallèle ou incliné légèrement vers le bas par rapport à la piste de roulement, le faisceau de lumière possédant une section transversale rectangulaire qui s'étend, où le faisceau de lumière atteint le bord de la pièce de monnaie, le long d'une bande parallèle à l'axe de la pièce de monnaie, et une largeur égale ou inférieure à la largeur du relief ou des modifications de surface (8) du bord de la pièce de monnaie qui doi(ven)t être détecté(es) ; et en ce que le capteur (9) responsable de l'analyse de la lumière réfléchie (10) est placé à côté du dispositif luminescent (3) de sorte que ledit capteur (9) reçoive seulement des réflexions diffuses (11) entraînées par le relief ou les modifications de surface du bord de la pièce de monnaie, mais non par une réflexion spéculaire (12) entraînée par les zones lisses dudit bord, dépourvues de tout relief ou de toute modification.
  2. Procédé selon la revendication 1, caractérisé en ce que ledit faisceau de lumière parallèle ou incliné légèrement vers le bas par rapport à la piste de roulement (2) de la pièce de monnaie est incident sur le bord de la pièce de monnaie sur d'au moins une partie de la piste de roulement à une hauteur, par rapport à la piste de roulement, supérieure au rayon de ladite pièce de monnaie.
  3. Procédé selon une quelconque revendication précédente, caractérisé en ce que le capteur de lumière (9) est placé à côté du dispositif luminescent (3).
  4. Procédé selon une quelconque revendication précédente, caractérisé en ce que le bord de la pièce de monnaie est éclairé par un faisceau qui recouvre la largeur entière du bord de ladite pièce de monnaie.
  5. Procédé selon une quelconque revendication précédente, caractérisé en ce que de la lumière (4) provenant du dispositif luminescent (3) est obligée de passer à travers une fente (5) qui produit le faisceau de lumière (6) avec une section transversale rectangulaire qui s'étend, où le faisceau de lumière atteint le bord de la pièce de monnaie, le long d'une bande parallèle à l'axe de la pièce de monnaie.
  6. Appareil pour la validation et la caractérisation des pièces de monnaie comprenant une piste de roulement (2), caractérisé en ce qu'il comprend un dispositif luminescent (3) émetteur de lumière collimatée, qui produit un faisceau (4) de lumière parallèle ou incliné légèrement vers le bas par rapport à la piste de roulement de la pièce de monnaie (1) ; une paroi ou un écran interposé entre le dispositif luminescent (3) et la pièce de monnaie (1) qui est pourvu d'une fente (5), qui permet à un faisceau de section transversale rectangulaire (6) de passer, la fente possédant une longueur d'approximativement 3 mm et une hauteur de 0,2 à 0,4 mm qui illumine le bord de la pièce de monnaie ; et un capteur de lumière réfléchie (9), qui est placé à côté du dispositif luminescent (3) de sorte qu'il reçoive seulement la lumière diffuse (12) réfléchie par le bord de la pièce de monnaie et non la lumière réfléchie de façon spéculaire (12) à partir dudit bord de ladite pièce de monnaie.
  7. Appareil selon la revendication 6, caractérisé en ce que le dispositif luminescent (3) est un laser à semi-conducteur.
  8. Appareil selon une quelconque des revendications 6 à 7, caractérisé en ce que la fente susmentionnée possède une hauteur égale ou inférieure à la taille du détail le plus petit ou de la modification géométrique la plus petite (8) qui doit être reconnu(e) dans le bord de la pièce de monnaie, et une longueur de préférence égale ou supérieure à l'épaisseur dudit bord.
  9. Appareil selon une quelconque des revendications 6 à 8, caractérisé en ce que le capteur (9) est une photodiode ou un phototransistor.
  10. Appareil selon une quelconque des revendications 6 à 9, caractérisé en ce que le capteur (9) est dans une position de réflexion arrière.
EP99961074A 1999-01-25 1999-12-28 Procede et appareil pour la validation et la caracterisation des pieces de monnaie Expired - Lifetime EP1067485B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ES009900141A ES2152175B1 (es) 1999-01-25 1999-01-25 Metodo y aparato para la validacion y caracterizacion de monedas.
ES9900141 1999-01-25
PCT/ES1999/000400 WO2000043961A1 (fr) 1999-01-25 1999-12-28 Procede et appareil pour la validation et la caracterisation des pieces de monnaie

Publications (2)

Publication Number Publication Date
EP1067485A1 EP1067485A1 (fr) 2001-01-10
EP1067485B1 true EP1067485B1 (fr) 2010-05-05

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EP99961074A Expired - Lifetime EP1067485B1 (fr) 1999-01-25 1999-12-28 Procede et appareil pour la validation et la caracterisation des pieces de monnaie

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EP (1) EP1067485B1 (fr)
AR (1) AR022184A1 (fr)
AU (1) AU1781300A (fr)
DE (1) DE69942337D1 (fr)
ES (2) ES2152175B1 (fr)
PE (1) PE20001262A1 (fr)
WO (1) WO2000043961A1 (fr)
ZA (1) ZA200000152B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI453699B (zh) * 2011-03-30 2014-09-21 Laurel Prec Machines Co Ltd 成像單元及硬幣識別裝置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2346612B1 (es) 2008-03-10 2011-08-04 Azkoyen Medios De Pago, S.A. Sistema y metodo de seleccion de monedas.
US8023121B2 (en) 2008-04-18 2011-09-20 Coinsecure, Inc. Method for optically collecting numismatic data and associated algorithms for unique identification of coins
EP2281279B1 (fr) * 2008-04-18 2015-11-04 Coinsecure, Inc. Appareil pour produire des signatures optiques à partir de la frappe de la monnaie
CN113053019B (zh) * 2021-03-08 2022-11-01 中钞长城金融设备控股有限公司 一种硬币边部质量检测方法及系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1582847A (en) * 1976-12-02 1981-01-14 Mars Inc Coin testing device
GB2071381B (en) * 1980-03-04 1984-01-18 Mars Inc Coin testing device
DE3711941A1 (de) * 1987-04-09 1988-10-20 Standard Elektrik Lorenz Ag Optoelektronischer muenzpruefer
GB2212313B (en) * 1987-11-13 1991-10-30 Coin & Micro Systems Limited Article identification
JPH0344770U (fr) * 1989-09-08 1991-04-25
NO168615C (no) * 1989-10-17 1992-03-11 Datalab Oy Fremgangsmaate og anordning for gjenkjenning av en mynt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI453699B (zh) * 2011-03-30 2014-09-21 Laurel Prec Machines Co Ltd 成像單元及硬幣識別裝置

Also Published As

Publication number Publication date
WO2000043961A1 (fr) 2000-07-27
ES2152175A1 (es) 2001-01-16
ZA200000152B (en) 2000-09-27
EP1067485A1 (fr) 2001-01-10
AU1781300A (en) 2000-08-07
DE69942337D1 (de) 2010-06-17
PE20001262A1 (es) 2000-12-11
ES2345966T3 (es) 2010-10-06
AR022184A1 (es) 2002-09-04
ES2152175B1 (es) 2001-07-01

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