EP1589493B1 - Procédé pour contrôler des pièces de monnaie - Google Patents

Procédé pour contrôler des pièces de monnaie Download PDF

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Publication number
EP1589493B1
EP1589493B1 EP05006475.7A EP05006475A EP1589493B1 EP 1589493 B1 EP1589493 B1 EP 1589493B1 EP 05006475 A EP05006475 A EP 05006475A EP 1589493 B1 EP1589493 B1 EP 1589493B1
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EP
European Patent Office
Prior art keywords
curve
coin
coins
coil
measurement
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Application number
EP05006475.7A
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German (de)
English (en)
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EP1589493A1 (fr
Inventor
Wilfried Meyer Dipl.-Ing.
Ulrich Cohrs Dipl.-Ing.
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.)
Crane Payment Innovations GmbH
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Crane Payment Innovations GmbH
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Publication of EP1589493A1 publication Critical patent/EP1589493A1/fr
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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
    • 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
    • G07D5/08—Testing the magnetic or electric properties

Definitions

  • the invention relates to a method for testing coins with an inductively operating sensor arrangement according to claim 1.
  • Inductive measuring arrangements for coin validators usually use a transmitting coil and on the opposite side of the coin path a receiver coil. As the coin passes through the magnetic field, the receiving coil is attenuated and it is possible, by measuring e.g. Amplitude, phase, frequency or real or imaginary part of current or voltage of the output signal of the receiving coil to discriminate counterfeit coins. Since the magnetic field must penetrate the entire coin, it is not possible to detect inhomogeneities in the material depth of the coin. For example, for a given coin, the magnetic moment may be determined but not whether the magnetic layer is on the surface or in the middle of the coin. A similar problem arises with plated coins. It can not be determined whether it is homogeneous material or plated coins.
  • the received signal is composed of a multiplicity of individual frequencies. Each switching step corresponds to certain frequency components.
  • the attenuated curve of the output signal of the receiver coil produced by the transmit signal usually has a steep rise and approaches a saturation value (approximately e-function). The higher frequencies are therefore assigned to the steeper part of the flank.
  • a maximum number of disturbing parameters is turned off, which otherwise would have to be met with increased effort.
  • the known method requires only a transmitting and receiving coil and an independently programmable signal generator, which is already part of a microprocessor, which is usually used for electronic coin validator.
  • the periodically repeating section has a microsecond period of time while coin passage is in the millisecond range. During the measurement period, the coin can be considered as standing. If a coin measurement is done inductively only from one side, the amplitude of the frequency-dependent attenuation curves depends on the distance that the coins have from the receiver coil.
  • the invention has for its object to provide a method for testing coins, with a sufficiently high resolution measurement across the thickness of the coin is made possible without that distance variations of the coin adversely affect.
  • the envelopes are not evaluated at the individual switching steps or measuring times; rather, the amplitude value of the output signal of the receiving coil is measured during a predetermined measuring interval when a coin passes through at least three different measuring times.
  • Amplitude here does not necessarily mean the maximum of a periodic attenuation curve, but the quantitative measured value at the respective measurement time.
  • the measurement interval within which at least three amplitude values are measured at different times is extremely short, for example 50 microseconds. In this timeframe, a passing coin can be considered as quasi stationary.
  • a curve or a mathematical function is formed by approximation using a curve fit method for homogeneous material.
  • This can, for. B. be an e-function.
  • This or the e-function is characteristic of the tested coin, ie for their material.
  • a characteristic time constant results for the e-function. This time constant is independent of the distance of the coin to the probe.
  • different curve shapes are obtained, depending on the frequency components used for measuring.
  • the leading times eg T1 ... T3 included Information about the material on the coin surface.
  • the back times eg T6 ... T8 over the coin material from the surface to the depth of the coin.
  • the method according to the invention can thus make a distance-independent measurement of coins. It is therefore particularly suitable for probe arrangements in which transmitting and receiving coil are arranged on one side of the coin path. In an opposite arrangement of the transmitting and receiving coil, the distance of the coin from the coils does not matter.
  • the method according to the invention is not limited thereto, but can also be applied to conventional sensor arrangements.
  • the temporal position of the measuring interval can depend on various criteria. Preferably, it is in the maximum of the amplitude values at which the coins completely in front of the measuring probe is arranged (complete cover).
  • the amplitude values in the individual recurring sections of the received signal increase with increasing attenuation of the field by the coin.
  • the attenuation reaches a maximum with maximum "shading" of the receiver coil. This can be determined relatively easily in terms of measurement technology by determining the amplitude values of at least three measuring times during the coin passage during the recurring sections of the received signal at the predetermined measuring times. If the amplitude values increase continuously, the maximum is still removed. If the amplitude values no longer change, the attenuation of the field is at its maximum.
  • the thickness of the coin is not included in the measurement result. Only when frequencies are chosen in which the magnetic field penetrates a coin, also results in a dependence of the measurement result of the thickness of a coin.
  • the invention provides for the arrangement of the receiver coil on the same side as the transmitter coil, wherein the cross section of the preferably smaller receiver coil is flooded by a homogeneous magnetic field component of the transmitter coil traversed by the coin.
  • receive and transmit coil are arranged on the same side.
  • a relatively good insensitivity to rough running of the coins is achieved in that the receiving coil is flooded substantially by a homogeneous field of the transmitting coil. It is therefore necessary to choose a coil arrangement with which this requirement is met.
  • the magnetic field in the center of the coil emerges or is approximately perpendicular to the core and the magnetic field lines curve only at a relatively great distance from the surface of the core.
  • the measuring plane is located from the coil arrangement. Since both poles of the receiver coil are flooded by the same transmission field, the coupling between transmitting and receiving coil is relatively weak, whereby the influence of the coin is increased to the measurement signal.
  • the output signal of the receiving coil is proportional to the field strength differences between the outer and inner pole of the receiving coil. These differences are in turn proportional to the total field strength and thus obtain the required field information.
  • the case achieved insensitivity to rough running of the coins (distance fluctuations of the coin) corresponds approximately to that of a large probe. With a small diameter of the coil, a high spatial resolution is obtained because of the small diameter of the receiver coil. This can be significantly smaller than that of the coins to be tested. This is important, for example, when testing so-called bi-color coins. With a larger diameter, a diameter check of the coins can be made possible.
  • An inventive arrangement for testing coins provides for the arrangement of a transmitting coil on a ferrite core whose length is greater than the length of the coil.
  • the receiving coil has a smaller diameter and is coaxially arranged on one side of the ferrite core such that it is flooded by a homogeneous field of the transmitting coil.
  • the receiving coil is seated in an end-side annular recess of the core, in particular of the ferrite core.
  • a further receiving coil is arranged on the opposite side of the coin track, which is flooded by the magnetic field of the transmitting coil, which penetrates the coin.
  • the method for testing coins can be carried out, for example, with a coil arrangement in which the transmitting coil and the receiving coil are arranged on a common ferrite core, wherein the receiving coil is penetrated by the homogeneous field of the transmitting coil (single-sided arrangement).
  • the transmitting coil will, as in DE 197 26 449 described, with periodically recurring pulses, for example in rectangular or triangular form, applied.
  • the duration of a pulse is, for example, 50 microseconds and is repeated periodically at equal intervals (milliseconds range).
  • the output signal of the receiving coil is approximately in Fig. 1 shown.
  • the individual times T1 to T8 of the output signal 10 can be assigned to certain frequency spectra.
  • T1 gives a high T8 one with a low frequency.
  • the signal 10 with the steps T1 to T8 represents a measurement interval which is repeated periodically.
  • the measuring interval has, as already mentioned, for example, a length of 50 microseconds.
  • Fig. 3 shows the determined damping curves for the throw-in of the same coin. If only the maxima were taken as a basis, a precise statement from the coin measurement can not be obtained, because a real coin can because of different distance have large differences in the amplitudes of the damping curves.
  • the measured values are interpolated for at least three measuring times for a measuring cycle, and the associated function or curve is determined by a curve fit method.
  • Fig. 4 are at the measuring times T1 to T3 respectively the measured amplitudes for z. B. applied a brass coin.
  • a curve fit m1 results in a curve m1 for a first draft and a curve m2 for the second draft.
  • Such ideal curves are in Fig. 2 applied to six coin materials (see Fig. 2 proper legend). It can be seen that the different curves associated with the individual coin materials are essentially distinguished by different time constants.
  • the curve 1 of Fig. 2 indicates the measuring state in which there is no coin within the magnetic field of the sensor arrangement.
  • FIG. 6 Three examples of the cross section of coins are indicated. Under 1. a plated or galvanized coin is shown, that is provided on both sides with a layer. In the middle example, a homogeneous coin is indicated, the z. B. brass, iron or a Kupfernickellegtechnik. In the lower example, a so-called laminated coin is shown with a nickel core and outer layers of copper / nickel alloy. With the help of the invention such coins are to be discriminated.
  • a ferrite core 10a is shown in section, on the outside of a transmitting coil 12 is applied.
  • the length of the ferrite core 10a is significantly larger than that of the transmitting coil 12, that is, almost four times the coil length.
  • the transmitting coil 12 is spaced from the ends of the ferrite core 10a.
  • a receiving coil 16 is arranged in an annular recess 14 at one end of the ferrite core 10a. It is coaxial with the transmitting coil 12, but has a much smaller inner and outer diameter than the transmitting coil 12.
  • a plane is indicated, in which normally moves a coin in a Münzprüfer along. The annular recess is thus facing the plane 18.
  • the running direction of the coins is approximately in the direction of arrow 20.
  • the magnetic field lines generated by the transmitting coil 12 are shown in dashed lines. In the region of the receiving coil 16, the magnetic field is largely homogeneous. Consequently, the magnetic field flowing through the receiving coil 16 and acting on the coin in the measuring plane 18 is largely homogeneous. A divergence of the Magnetic lines, as indicated at 22, takes place at a greater distance from the coil arrangement.

Claims (4)

  1. Procédé pour contrôler des pièces de monnaie avec un dispositif de capteur inductif qui présente une bobine émettrice et une bobine réceptrice (12, 16) dont le champ est traversé par une pièce de monnaie, avec les étapes suivantes :
    la bobine émettrice (12) est alimentée avec un signal d'émission (10) périodique contenant plusieurs harmoniques, caractérisé en ce que,
    pendant un segment prédéfini (intervalle de mesure) des segments périodiquement récurrents du signal d'émission ou respectivement de réception (10), les amplitudes du signal de réception sont mesurées à au moins trois instants de mesure (T1, T2, T3) prédéfinis différents, les instants de mesure (T1, T2, T3) différents correspondant à différentes fractions de fréquence,
    en ce que, à partir des valeurs d'amplitude, une courbe (m1, m2) ou respectivement une fonction mathématique de la courbe est formée ou respectivement déterminée par un procédé d'ajustement de courbe, et
    en ce que la courbe (m1, m2) ou respectivement la fonction est, concernant au moins une valeur caractéristique, comparée à une courbe de consigne ou respectivement fonction de consigne enregistrée en vue de la production d'un signal d'acceptation ou de restitution pour la pièce de monnaie respectivement contrôlée.
  2. Procédé selon la revendication 1, caractérisé en ce qu'un intervalle de mesure est choisi, dans lequel les valeurs d'amplitude sont maximales.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, pour la mesure de surface ou proche de la surface de pièces de monnaie mesurées à des instants précoces d'un intervalle de mesure et à partir des valeurs d'amplitude, une courbe (m1, m2) ou respectivement une fonction mathématique de la courbe est formée par un procédé d'ajustement de courbe.
  4. Procédé selon la revendication 1 ou 2, caractérisé en ce que, pour la mesure de couches individuelles de pièces de monnaie mesurées à des instants ultérieurs d'un intervalle de mesure et à partir des valeurs d'amplitude, une courbe (m1, m2) ou respectivement une fonction mathématique de la courbe est formée par un procédé d'ajustement de courbe.
EP05006475.7A 2004-04-24 2005-03-24 Procédé pour contrôler des pièces de monnaie Active EP1589493B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004020159 2004-04-24
DE102004020159A DE102004020159A1 (de) 2004-04-24 2004-04-24 Verfahren zum Prüfen von Münzen

Publications (2)

Publication Number Publication Date
EP1589493A1 EP1589493A1 (fr) 2005-10-26
EP1589493B1 true EP1589493B1 (fr) 2017-04-19

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EP05006475.7A Active EP1589493B1 (fr) 2004-04-24 2005-03-24 Procédé pour contrôler des pièces de monnaie

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EP (1) EP1589493B1 (fr)
DE (1) DE102004020159A1 (fr)
ES (1) ES2630180T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007046390B3 (de) * 2007-09-20 2008-11-27 National Rejectors, Inc. Gmbh Verfahren zum Prüfen von Münzen
US8561777B2 (en) * 2007-10-23 2013-10-22 Mei, Inc. Coin sensor
DE202011052023U1 (de) 2011-11-18 2012-01-03 Wincor Nixdorf International Gmbh Vorrichtung zur Handhabung von Münzen
CN104205176B (zh) 2012-03-14 2018-04-17 梅伊有限公司 硬币传感器

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19726449A1 (de) * 1997-06-21 1999-01-07 Nat Rejectors Gmbh Verfahren und Schaltungsanordnung zur Prüfung von Münzen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4441602A (en) * 1981-12-02 1984-04-10 Joseph Ostroski Electronic coin verification mechanism
US5085309A (en) * 1989-06-07 1992-02-04 Adamson Phil A Electronic coin detector
GB2331614A (en) * 1997-11-19 1999-05-26 Tetrel Ltd Inductive coin validation system
DE10140225C2 (de) * 2001-08-16 2003-08-07 Nat Rejectors Gmbh Verfahren und Vorrichtung zur Messung des Durchmessers von Münzen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19726449A1 (de) * 1997-06-21 1999-01-07 Nat Rejectors Gmbh Verfahren und Schaltungsanordnung zur Prüfung von Münzen

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DE102004020159A1 (de) 2005-11-17
ES2630180T3 (es) 2017-08-18
EP1589493A1 (fr) 2005-10-26

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