EP1589493A1 - Verfahren und Vorrichtung zum Prüfen von Münzen - Google Patents
Verfahren und Vorrichtung zum Prüfen von Münzen Download PDFInfo
- Publication number
- EP1589493A1 EP1589493A1 EP05006475A EP05006475A EP1589493A1 EP 1589493 A1 EP1589493 A1 EP 1589493A1 EP 05006475 A EP05006475 A EP 05006475A EP 05006475 A EP05006475 A EP 05006475A EP 1589493 A1 EP1589493 A1 EP 1589493A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coin
- curve
- coil
- receiving coil
- coins
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010200 validation analysis Methods 0.000 title 1
- 238000005259 measurement Methods 0.000 claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 230000001939 inductive effect Effects 0.000 claims abstract description 6
- 230000000737 periodic effect Effects 0.000 claims abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 11
- 238000007620 mathematical function Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims description 2
- 238000003360 curve fit method Methods 0.000 claims 1
- 238000004441 surface measurement Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 238000013016 damping Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012067 mathematical method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000000306 recurrent effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
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
- G07D5/08—Testing the magnetic or electric properties
Definitions
- the invention relates to a method for testing coins with a inductively operating sensor arrangement according to claim 1.
- Inductive measuring arrangements for coin validators usually use one Transmitter coil and on the opposite side of the coin track a receiver coil. As the coin passes through the magnetic field, it becomes the receiving coil attenuates, and it is possible by measuring e.g. Amplitude, phase, frequency or real or imaginary part of current or voltage of the output signal the receiving coil to discriminate counterfeit coins. Because the magnetic field is the Whole coin must penetrate, it is not possible inhomogeneities in the Determine material depth of the coin. For example, for a given Coin the magnetic moment are determined, but not whether the magnetic layer located on the surface or in the middle in the coin. One the same problem arises with plated coins. It can not be determined whether they are homogenous material or plated coins.
- the received signal settles a variety of individual frequencies together. Correspond to each switching step certain frequency components.
- the muted signal generated by the transmit signal Curve of the output signal of the receiving coil usually has a steep Rise to and approach a saturation value (approximate e-function). The higher frequencies are therefore attributable to the steeper part of the flank. In which known methods, a maximum number of disturbing parameters is switched off, otherwise would have to be met with increased effort.
- the known method requires only one transmit and receive coil and one independently programmable Signal generator, which is part of a microprocessor anyway, commonly used for electronic coin validators.
- the periodic recurring section has a microsecond period, while the coin passage is in the millisecond range. During the measurement period the coin can be considered as standing. If a coin measurement occurs Inductive way only from one side, depends on the amplitude of the - frequency-dependent - Cushioning curves from the distance that the coins from the receiving coil to have.
- the invention is based on the object, a method for checking coins indicate, with the sufficiently high resolution, a measurement across the thickness allows the coin away, without that distance fluctuations of the Coin adversely affect.
- the method according to the invention is based on a measuring technique, as described in DE 197 26 449 C2.
- the envelopes to the individual switching steps or measurement times evaluated but rather during a predetermined measurement interval during the passage of a coin at at least three different measuring times in each case the amplitude value of the output signal of the receiver coil is measured.
- Amplitude here does not necessarily mean the maximum of a periodic damping curve, but the quantitative measured value at each measurement time.
- the Measuring interval, within the at least three amplitude values to different Time points is extremely short, for example, 50 microseconds. In this timeframe, a passing coin can be considered quasi stationary to be viewed as.
- Material a curve or a mathematical function formed by approximation.
- This can, for. B. be an e-function.
- This or the e-function is characteristic for the tested coin, i. for their material.
- Homogeneous material results e.g. a characteristic time constant for the e-function. This time constant is regardless of the distance of the coin to the probe. Obtained with layer material depending on the frequency components used for measuring different waveforms.
- the back times e.g. T6 ... T8 over the coin material from the surface to the bottom of the coin.
- the quality of a Kurvenfit's depends on the Number of measuring points used.
- the curve (s) or function (s) resulting from the measurements of a Measuring interval is obtained with a predetermined setpoint curve or Target function compared. Is it true in one or more parameters with the Target curve or setpoint function match, an acceptance signal can be generated. With this method, it is therefore possible, not just a reliable one Discriminate against counterfeit coins, but also the coin material to identify. It is understood that for each type of coin one or more desired curves or functions is / are stored.
- the method according to the invention can thus be a distance independent Measuring coins. It is therefore especially for probe arrangements suitable, in which transmitting and receiving coil on one side of the Münzlaufbahn are arranged. In an opposite arrangement of Transmitter and receiver coil plays the distance of the coin from the coils none Role.
- 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 grow in the individual recurring Sections of the received signal with increasing attenuation of the field through the coin.
- the attenuation reaches a maximum at maximum "Shading" of the receiver coil. This can be relatively easy by measurement Detect by during the coin run during the recurring Sections of the received signal at the predetermined measurement times the amplitude values be determined by at least three measurement times. Climb the Amplitude values continuously, the maximum is still removed. Change the Amplitude values no longer, is the attenuation of the field in the maximum.
- the thickness of the coin is not in the measurement result one. Only when frequencies are chosen where the magnetic field is a Coin penetrates, there is also a dependence of the measurement result of the Thickness of a coin.
- the invention sees the arrangement of the receiver coil on the same side as the transmitting coil, wherein the cross section of the preferably smaller receiving coil from a homogeneous magnetic field portion of the coin traversed by the coin Flood coil is flooded.
- the method according to the invention therefore Receiving and transmitting coil arranged on the same side.
- a relatively good one Insensitivity to rough running of the coins is achieved in that the Reception coil substantially flooded by a homogeneous field of the transmitting coil becomes. It is therefore necessary to choose a coil arrangement with which this requirement is fulfilled.
- the magnetic field occurs in the coil center approximately perpendicular to the core off or on and the magnetic field lines curve only at a relatively large 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 relatively weak, whereby the influence of the coin on the Measuring signal is increased.
- the output signal of the receiver coil is proportional to the field strength differences between the outer and inner pole of the receiver coil. These differences are in turn proportional to the total field strength and obtained thus the required field information.
- the case achieved insensitivity against uneven running of the coins (distance fluctuations of the coin) corresponds such as a large probe.
- the diameter of the coil is small, a obtained high spatial resolution because of the small diameter of the receiving coil. This can be significantly smaller than that of the coins to be tested. This e.g. important in the examination so-called bicolor coins. With a larger diameter can be also allow a diameter check of the coins.
- An arrangement according to the invention for testing coins sees the arrangement a transmitting coil on a ferrite core whose length is greater than the length of the Kitchen sink.
- the receiver coil has a smaller diameter and is at one Side of the ferrite core arranged coaxially so that they are of a homogeneous field the transmission coil is flooded.
- the receiver coil sits in one end-side annular recess of the core, in particular of the ferrite core.
- a further receiving coil on the arranged opposite side of the coin track, which from the magnetic field the transmitting coil, which penetrates the coin, is flooded.
- the method of testing coins may be e.g. with a coil arrangement be carried out at the transmitting coil and receiving coil on a common Ferrite core are arranged, wherein the receiving coil of the homogeneous Field of the transmitting coil is penetrated (one-sided arrangement).
- the transmitting coil is, as described in DE 197 26 449, with periodic recurrent pulses, e.g. in rectangular or triangular form, applied.
- the Duration of a pulse is e.g. 50 microseconds and is at equal intervals (Millisecond range) is repeated periodically.
- the output signal of Reception coil is shown approximately in Fig. 1.
- the individual times T1 to T8 of the output signal 10 can be determined Frequency spectra are assigned.
- T1 gives a high T8 harmonic one with low frequency.
- the signal 10 with steps T1 to T8 is set Measuring interval, which is repeated periodically.
- the measuring interval has, as already mentioned, for example, a length of 50 microseconds.
- Fig. 3 shows the determined attenuation curves for the Einwerfe same Coin. If only the maxima were taken as a basis, a precise statement can be made The coin measurement can not be won, because a real coin can because of different distance large differences in the amplitudes of the damping curves exhibit.
- the measured values are added for one measuring cycle interpolated at least three measuring times and by a Kurvenfitmaschine the corresponding function or curve determined.
- Fig. 4 are at the measuring times T1 to T3 respectively the measured amplitudes for z. B. a brass coin applied. It results from a Kurvenfitmaschine one Curve ml for a first draft and a curve m2 for the second draft. After a normalization of the curve or function obtained in this way they are compared to the ideal curve that is determined and stored beforehand. Such ideal curves are plotted in FIG. 2 for six coin materials (see FIG to Fig. 2 associated legend).
- the curve 1 of Fig. 2 indicates the state of measurement, in which no coin within the magnetic field of the sensor array is located.
- FIG. 6 three examples of the cross section of coins are indicated. Under 1. a plated or galvanized coin is shown, i. H. on both sides with one Layer is provided. In the middle example, a homogeneous coin is indicated, the z. B. brass, iron or a Kupfernickellegtechnik. In the example below is a so-called layer coin represented with a nickel core and outer Layers of copper / nickel alloy. With the help of the invention such Coins are discriminated against.
- 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 the transmitting coil 12, d. H. is nearly 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 lower interior and Outer diameter than the transmitting coil 12.
- With 18 a plane is indicated, in which normally moves a coin along in a coin validator. The ring recess is thus at level 18.
- the 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. Thus, the receiving coil 16 is flooding and the coin in the measurement plane 18 acting magnetic field largely homogeneous. A divergence of the Magnetic lines, as indicated at 22, takes place at a greater distance from the coil arrangement instead of.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Coins (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
- Fig. 1
- zeigt ein Diagramm eines Meßsignals, das von einem Rechtecksignal erzeugt wird.
- Fig. 2
- zeigt ein Amplitudendiagramm für verschiedene Münzmaterialien über der Zeit während eines Meßintervalls.
- Fig. 3
- zeigt in einem Diagramm unterschiedliche Dämpfungskurven der gleichen Münze bei zwei Einwürfen.
- Fig. 4
- zeigt ein Diagramm der resultierenden nach Normierung identischen Kurven für die Amplituden während eines Meßintervalls.
- Fig. 5
- zeigt eine schematisch dargestellte Spulenanordnung nach der Erfindung.
- Fig. 6
- zeigt Beispiele von Querschnitten von zu prüfenden Münzmaterialien.
Claims (10)
- Verfahren zum Prüfen von Münzen mit einer induktiven Sensoranordnung, die eine Sende- und eine Empfangsspule aufweist, deren Feld von einer Münze durchquert wird, mit den folgenden Schritten:die Sendespule wird mit einem Harmonische enthaltenden periodischen Sendesignal gespeistwährend eines vorgegebenen Abschnitts (Meßintervalls) der periodisch wiederkehrenden Abschnitte des Sende- bzw. Empfangssignals werden an mindestens drei unterschiedlichen, vorgegebenen Meßzeitpunkten (T1, T2, T3) die Amplituden des Empfangssignals gemessenaus den Amplitudenwerten wird durch ein Kurvenfitverfahren eine Kurve bzw. eine mathematische Funktion der Kurve gebildet bzw. ermitteltdie Kurve bzw. die Funktion wird im Hinblick auf mindestens einen charakteristischen Wert mit einer gespeicherten Sollkurve bzw. Sollfunktion verglichen zwecks Erzeugung eines Annahme- oder Rückgabesignals für die jeweils geprüfte Münze.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß ein Meßintervall gewählt wird, in dem die Amplitudenwerte maximal sind.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zur oberflächen- oder oberflächennahen Messung von Münzen zu frühen Zeitpunkten eines Meßintervalls gemessen und aus den Amplitudenwerten durch Kurvenfitverfahren eine Kurve bzw. eine mathematische Funktion der Kurve bildet wird.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zur Messung von einzelnen Schichten der Münzen zu späteren Zeitpunkten eines Meßintervalls gemessen und aus den Amplitudenwerten durch ein Kurvenfitverfahren eine Kurve bzw. eine mathematische Funktion der Kurve gebildet wird.
- Vorrichtung zum Prüfen von Münzen mit einer induktiven Sensoranordnung zur Durchfiihrung des Verfahrens nach den Ansprüchen 1 bis 4, die eine Sende- und eine Empfangsspule aufweist, deren Feld von einer Münze durchquert wird, bei der die Sendespule von einem Sendesignal gespeist wird und ein Ausgangssignal der Empfangsspule in eine Auswertevorrichtung gegeben wird, welche das Ausgangssignal auswertet, zur Erzeugung eines Annahme- oder Rückgabesignals, dadurch gekennzeichnet, daß Sende- und Empfangsspule (12, 16) auf einem Ferritkern (10a) auf einer Seite der Münzlaufbahn (18) angeordnet sind und der Durchmesser der Sendespule (12) so groß ist, daß ihr Feld in der Mitte einen homogenen Verlauf zeigt und die Empfangsspule (16) im homogenen Feldbereich der Sendespule (12) angeordnet ist.
- Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Empfangsspule (16) in einer koaxialen Ringausnehmung (14) des Ferritkerns (10a) angeordnet ist.
- Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Ringausnehmung (14) in der der Münzlaufbahn (18) zugekehrten Stirnseite des Ferritkerns (10a) geformt ist.
- Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die Empfangsspule (16) versenkt in der Ringausnehmung (14) angeordnet ist.
- Vorrichtung nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß eine weitere Empfangsspule auf der gegenüberliegenden Seite der Münzlaufbahn (18) angeordnet ist, welche von dem Magnetfeld der Sendespule (12) durchflutet ist, das die Münze durchdringt.
- Vorrichtung nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, daß der Durchmesser der Empfangsspule (16) deutlich kleiner ist als der Durchmesser der zu messenden Münzen.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004020159A DE102004020159A1 (de) | 2004-04-24 | 2004-04-24 | Verfahren zum Prüfen von Münzen |
DE102004020159 | 2004-04-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1589493A1 true EP1589493A1 (de) | 2005-10-26 |
EP1589493B1 EP1589493B1 (de) | 2017-04-19 |
Family
ID=34934486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05006475.7A Active EP1589493B1 (de) | 2004-04-24 | 2005-03-24 | Verfahren zum Prüfen von Münzen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1589493B1 (de) |
DE (1) | DE102004020159A1 (de) |
ES (1) | ES2630180T3 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2203902A2 (de) * | 2007-10-23 | 2010-07-07 | MEI, Inc. | Münzdetektor |
DE202011052023U1 (de) | 2011-11-18 | 2012-01-03 | Wincor Nixdorf International Gmbh | Vorrichtung zur Handhabung von Münzen |
US8622190B2 (en) | 2012-03-14 | 2014-01-07 | Mei, Inc. | Coin sensor |
Families Citing this family (1)
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 |
Citations (3)
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 |
EP0918306A2 (de) * | 1997-11-19 | 1999-05-26 | Tetrel Limited | Induktives Münzprüfungssystem und damit versehener Münzfernsprecher |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19726449C2 (de) * | 1997-06-21 | 1999-04-15 | Nat Rejectors Gmbh | Verfahren und Schaltungsanordnung zur Prüfung von Münzen |
DE10140225C2 (de) * | 2001-08-16 | 2003-08-07 | Nat Rejectors Gmbh | Verfahren und Vorrichtung zur Messung des Durchmessers von Münzen |
-
2004
- 2004-04-24 DE DE102004020159A patent/DE102004020159A1/de not_active Withdrawn
-
2005
- 2005-03-24 EP EP05006475.7A patent/EP1589493B1/de active Active
- 2005-03-24 ES ES05006475.7T patent/ES2630180T3/es active Active
Patent Citations (3)
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 |
EP0918306A2 (de) * | 1997-11-19 | 1999-05-26 | Tetrel Limited | Induktives Münzprüfungssystem und damit versehener Münzfernsprecher |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2203902A2 (de) * | 2007-10-23 | 2010-07-07 | MEI, Inc. | Münzdetektor |
EP2203902A4 (de) * | 2007-10-23 | 2011-12-14 | Mei Inc | Münzdetektor |
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 |
US8622190B2 (en) | 2012-03-14 | 2014-01-07 | Mei, Inc. | Coin sensor |
Also Published As
Publication number | Publication date |
---|---|
ES2630180T3 (es) | 2017-08-18 |
EP1589493B1 (de) | 2017-04-19 |
DE102004020159A1 (de) | 2005-11-17 |
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