EP0520230B1 - Verfahren zum Betrieb eines elektronischen Münzprüfers - Google Patents

Verfahren zum Betrieb eines elektronischen Münzprüfers Download PDF

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Publication number
EP0520230B1
EP0520230B1 EP92109636A EP92109636A EP0520230B1 EP 0520230 B1 EP0520230 B1 EP 0520230B1 EP 92109636 A EP92109636 A EP 92109636A EP 92109636 A EP92109636 A EP 92109636A EP 0520230 B1 EP0520230 B1 EP 0520230B1
Authority
EP
European Patent Office
Prior art keywords
acceptance
acceptance band
coins
band
coin
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
EP92109636A
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German (de)
English (en)
French (fr)
Other versions
EP0520230A1 (de
Inventor
Jochen Best
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
Original Assignee
National Rejectors Inc GmbH
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 National Rejectors Inc GmbH filed Critical National Rejectors Inc GmbH
Publication of EP0520230A1 publication Critical patent/EP0520230A1/de
Application granted granted Critical
Publication of EP0520230B1 publication Critical patent/EP0520230B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a method for operating an electronic coin validator.
  • Electronic coin validators contain at least one test probe, which determines a physical property of the coin to be tested, for example the material. Inductive probes are often used, the damping of which is characteristic of a coin.
  • the analog measurement signal is digitized and compared with a reference signal in order to give a real signal in the case of a real coin and a bad signal in the case of a false or foreign coin.
  • the digital measurement signal is usually processed in a microprocessor, which also controls coin acceptance and sorting.
  • the reference value is stored in the microprocessor's memory.
  • WO-A-9183372 describes a method in which at least two sensors and at least two acceptance bands of different dimensions or positions are provided.
  • a sensor is e.g. the further acceptance band is used and the narrower acceptance band with regard to the other sensor. If this does not form an acceptance criterion, the narrower acceptance band is used for the first sensor and the further acceptance band is used for the second sensor.
  • the genuineness criteria are progressive. In the method described, it is a prerequisite that not only the distribution curve for the real coins is known, but also for counterfeit coins. The aim of the procedure is to accept 100% of all real coins if possible.
  • the reference values can be determined, for example, with the help of test coins or an arbitrary selection of real coins. From DE-OS 31 03 371 has also become known to enter a learning program for the microprocessor, which itself determines the reference values when it is put into operation by inserting real coins. Since the electronic and electrical components of the coin validator can change their properties after a long period of operation and due to environmental influences (drift) and also the real coins change their properties over the years, the reference values have become known from the cited document and from EP 0 155 126 to be modified continuously or from time to time depending on the area in which the measurement signals are determined. The coin validator adapts itself to the changed conditions, so to speak, so that readjustment can be omitted.
  • EP-A-0 480 736 describes a method in which so-called self-tuning is also used.
  • self-tuning is also used.
  • the acceptance band will be shifted until not only real coins but also false coins are accepted.
  • it is therefore measured whether it is close to the acceptance band. If this is the case repeatedly, the acceptance band is shifted or narrowed.
  • the postponement or restriction is lifted as soon as it is certain that no attempt will be made to attempt to shift the acceptance band in self-tuning systems by inserting outside money or falsified products.
  • EP -A- 0 480 736 which belongs to the prior art according to Art. 54 (3) EPC, discloses a method from which the subject matter of claim 1 differs in that a change to the narrow acceptance band takes place when the signal one or more previous coins lies outside the narrow, but within the wide acceptance band.
  • EP-A-0 480 736 on the other hand, a switchover to the narrow acceptance band takes place when the signal of one or more previous coins was in the "near miss" range, the "near miss” range lying outside the wide acceptance band.
  • the statistical distribution of the measurement signals generated by real coins corresponds to the Gaussian curve, ie the maximum of the measurement signals lies in the middle between the limit values, while only a few measurement signals appear near the limit values.
  • Counterfeit or foreign coins are naturally so produced or selected that they come as close as possible to the properties of the real coins to be tested.
  • the statistical distribution of the measurement signals of many such coins also corresponds to a Gaussian bell curve.
  • the invention is therefore based on the object of specifying a method which ensures the highest possible acceptance rate for real coins and the lowest possible acceptance rate for counterfeit coins.
  • the measurement signal is compared with a second acceptance band that is narrower than the first acceptance band.
  • the upper limit or reference value can be selected to be smaller in the second acceptance band.
  • the measurement signal of one or more previous coins lies inside or outside the second acceptance band, in the latter case, however, it lies within the first acceptance band uses the first or the second acceptance band to generate a real or reject signal. If the measurement signal of at least one previous coin lies outside the second acceptance band, the second acceptance band is used for coin testing, specifically when the measurement signal lies within the first acceptance band. However, if the measurement signal of at least one coin lies within the second acceptance band, the first acceptance band is used.
  • the method according to the invention is based on the following considerations. As already mentioned, some of the measurement signals from counterfeit coins fall into the acceptance band for real coins if this is specified so broadly that almost all real coins are accepted. If a measurement signal from the coin validator falls near the limit value, over which the measurement signals of the counterfeit coins overlap the acceptance band, the probability is relatively high that the counterfeit coin is involved. At least the probability is greater than that a real coin has been inserted. In order to ensure a safe elimination of counterfeit money, the coin validator is switched over to the second narrower acceptance band in the method according to the invention. This ensures that the subsequent coin is eliminated if its measurement signal lies outside the second acceptance band. Here it can happen that a real coin is eliminated. However, the probability is relatively low.
  • the method according to the invention cannot necessarily prevent the acceptance of a single counterfeit coin, but by shifting the limit values of the acceptance band, all subsequent counterfeit coins are eliminated. Only when a measurement signal lies within the narrower acceptance band is there a high probability that the next following coins are real coins, so that a switch back to the wider first acceptance band can take place.
  • the acceptance rate for counterfeit coins can be significantly reduced by an appropriate choice of the switching limit between the first and second acceptance band without the acceptance rate for real money being significantly reduced.
  • the switchover limit from the first to the second acceptance band and vice versa can be formed from the reduced reference value of the second acceptance band.
  • a criterion for the switchover it was stated that at least one coin should have a measured value above the critical value so that a switchover to the narrower acceptance band takes place.
  • the processing of the measurement signals according to the invention in the coin validator is expediently carried out in a microprocessor which is programmed in such a way that it forms two measurement channels, the changeover from one to the other measurement channel being carried out by the program of the microprocessor and not requiring special circuit components.
  • Curve E represents the distribution curve for the measurement signals of a real coin. It is, for example, the curve for a 1 DM coin from which a certain physical property is measured with the aid of a test probe, for example the material composition.
  • the test signal's initially analog measurement signal is digitized so that qualitative statements can also be made.
  • most of the measurement signals lie in a middle range between the limit or reference values of curve E, which are marked with Ru or Ro.
  • the position of the lower and upper reference value should be selected so that they coincide with the limit values Ru and Ro.
  • This so-called acceptance band is indicated in FIG. 1 with channel K.
  • the curve F represents the distribution of the measurement signals, which are present during the insertion of 20 sloty coins. 20-sloty coins, the value of which is only a fraction of a 1 DM coin, are often used for fraudulent purposes. As can be seen, curves E and F overlap. The area of overlap is indicated by the dashed line passing through the limit value Ro. All counterfeit coins whose measured value falls within the overlap area will be accepted if the coin validator works with the acceptance band channel K. Quantitatively, for example, 30% counterfeit coins can therefore be accepted with 100% acceptance of the real coins.
  • the overlap area is reduced and the acceptance rate for counterfeit money is significantly lower, e.g. Only 5%.
  • the acceptance rate for real money is also reduced.
  • a query routine is now carried out in the microprocessor, for example for every coin inserted. If the measurement signal of the inserted coin is in the acceptance band channel K ', the acceptance band channel K is switched. If the measurement signal lies outside the acceptance band channel K ', the narrow acceptance band channel K' is switched to.
  • the limit value G for the curves E and F so that - statistically - 10% of all genuine coins are eliminated when the coin validator works with the acceptance band channel K '. At the same time, 5% counterfeit coins are accepted. In the further channel K 100% of all real coins and 30% of all counterfeit coins are accepted.
  • the acceptance rates of the coins are no longer simply comparable to the rates of a fixed setting, but are composed of a fixed component and a dynamic component.
  • the fixed portion is the amount of coins that can be read directly by setting the acceptance band.
  • the dynamic component results from the computational probability with which channel K is activated in relation to channel K '.
  • the electronic coin validator accepts the latter amount regardless of which active channel is switched on. The minimum assumption is therefore 100% x M '(90%). This corresponds to the fixed part of the acceptance rate.
  • the dynamic part results from the following consideration: Whenever a coin is within the acceptance band K ' lies, the coin validator switches to acceptance band K. The probability that this will occur is as great as shown by the distribution curve, namely 90%. That means nine times more likely to get K than K '. The difference MM 'occurs M times.
  • the acceptance rate of real money to counterfeit money is therefore 99% to 6.25%.
  • the real money rate is therefore imperceptibly reduced, while the counterfeit money acceptance rate is significantly reduced.
  • a shift in the limit G of the smaller acceptance band is possible, for example in order to increase or decrease the acceptance rate of the real money.
  • the criteria for switching to the acceptance bands depend on the quality and frequency of the counterfeit money.
  • the general procedure is as follows: n coins smaller than critical value> Switchover to acceptance band channel K n coins larger than critical value> switchover to acceptance band channel K '.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)
EP92109636A 1991-06-26 1992-06-09 Verfahren zum Betrieb eines elektronischen Münzprüfers Expired - Lifetime EP0520230B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4121034 1991-06-26
DE4121034A DE4121034C1 (enrdf_load_stackoverflow) 1991-06-26 1991-06-26

Publications (2)

Publication Number Publication Date
EP0520230A1 EP0520230A1 (de) 1992-12-30
EP0520230B1 true EP0520230B1 (de) 1996-09-18

Family

ID=6434744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92109636A Expired - Lifetime EP0520230B1 (de) 1991-06-26 1992-06-09 Verfahren zum Betrieb eines elektronischen Münzprüfers

Country Status (4)

Country Link
US (1) US5355989A (enrdf_load_stackoverflow)
EP (1) EP0520230B1 (enrdf_load_stackoverflow)
DE (2) DE4121034C1 (enrdf_load_stackoverflow)
ES (1) ES2093141T3 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5624019A (en) * 1991-04-18 1997-04-29 Mars Incorporated Method and apparatus for validating money
US5931277A (en) * 1995-05-09 1999-08-03 Mars, Incorporated Money validation system using acceptance criteria
GB2331828B (en) * 1997-11-28 2001-08-08 Mars Inc Currency validation apparatus and method
GB9903024D0 (en) * 1999-02-10 1999-03-31 Coin Controls Money item acceptor
GB2397158A (en) * 2003-01-08 2004-07-14 Money Controls Ltd Money item acceptor
GB0300633D0 (en) * 2003-01-10 2003-02-12 Money Controls Ltd Money item acceptor with enhanced security
WO2004104945A1 (ja) * 2003-05-22 2004-12-02 Kabushiki Kaisha Nippon Conlux 硬貨メタル処理装置およびその制御方法
JP5341453B2 (ja) * 2008-09-30 2013-11-13 サンデン株式会社 貨幣識別装置
US10896566B2 (en) * 2017-09-04 2021-01-19 Asahi Seiko Co., Ltd. Coin recycle device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991018372A1 (en) * 1990-05-14 1991-11-28 Coin Controls Limited Coin discrimination apparatus

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2023076A1 (de) * 1970-05-12 1971-11-25 Lochstampfer Horst Dipl Ing Muenzmessstelle
EP0043189B1 (en) * 1980-06-20 1986-09-24 Plessey Overseas Limited Method of and apparatus for assessing coins
DE3103371A1 (de) * 1981-01-27 1982-08-05 Günter Wulff-Apparatebau GmbH, 1000 Berlin Verfahren zur festlegung der grenzwerte der gut-/schlecht-kennung von muenzen
GB2118344A (en) * 1982-02-12 1983-10-26 Mars Inc Coin testing apparatus
US4538719A (en) * 1983-07-01 1985-09-03 Hilgraeve, Incorporated Electronic coin acceptor
ZA851248B (en) * 1984-03-01 1985-11-27 Mars Inc Self tuning coin recognition system
US4951799A (en) * 1988-02-10 1990-08-28 Tamura Electric Works, Ltd. Method of correcting coin data and apparatus for inspecting coins
CH676162A5 (enrdf_load_stackoverflow) * 1988-11-07 1990-12-14 Ascom Autelca Ag
US5067604A (en) * 1988-11-14 1991-11-26 Bally Manufacturing Corporation Self teaching coin discriminator
IT1232019B (it) * 1989-02-23 1992-01-23 Urmet Spa Perfezionamento ai selezionatori di monete
US5167313A (en) * 1990-10-10 1992-12-01 Mars Incorporated Method and apparatus for improved coin, bill and other currency acceptance and slug or counterfeit rejection

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991018372A1 (en) * 1990-05-14 1991-11-28 Coin Controls Limited Coin discrimination apparatus

Also Published As

Publication number Publication date
DE59207161D1 (de) 1996-10-24
DE4121034C1 (enrdf_load_stackoverflow) 1992-09-10
ES2093141T3 (es) 1996-12-16
US5355989A (en) 1994-10-18
EP0520230A1 (de) 1992-12-30

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