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EP0209842A2 - Dispositif muni d'un capteur pour l'identification de pièces de monnaie - Google Patents

Dispositif muni d'un capteur pour l'identification de pièces de monnaie Download PDF

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Publication number
EP0209842A2
EP0209842A2 EP86109729A EP86109729A EP0209842A2 EP 0209842 A2 EP0209842 A2 EP 0209842A2 EP 86109729 A EP86109729 A EP 86109729A EP 86109729 A EP86109729 A EP 86109729A EP 0209842 A2 EP0209842 A2 EP 0209842A2
Authority
EP
European Patent Office
Prior art keywords
coin
sensor
coins
sensors
piezoelectric
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.)
Withdrawn
Application number
EP86109729A
Other languages
German (de)
English (en)
Other versions
EP0209842A3 (fr
Inventor
Andras Gati
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0209842A2 publication Critical patent/EP0209842A2/fr
Publication of EP0209842A3 publication Critical patent/EP0209842A3/fr
Withdrawn legal-status Critical Current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
    • G07D5/005—Testing the surface pattern, e.g. relief
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S310/00—Electrical generator or motor structure
    • Y10S310/80—Piezoelectric polymers, e.g. PVDF
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S73/00—Measuring and testing
    • Y10S73/04—Piezoelectric

Definitions

  • the invention relates to a device with a sensor for recognizing coins, in particular for separating approved and non-approved coins or for determining the coin value.
  • the testing of coins is e.g. in vending and service machines necessary to recognize the coin value, since the countervalue should only be provided for prescribed coins.
  • the known methods for recognizing coins analyze in particular the criteria weight, diameter, thickness and the electromagnetic properties of the coin alloy.
  • To determine the weight of coins it is known to use sensors in the form of foils made of polymeric material with piezoelectric properties (cf. GR Crane in IEEE Transactions on Sonics and Ultrasonics, Vol. SU-25, NO.6, November 1978).
  • sensors in the form of foils made of polymeric material with piezoelectric properties (cf. GR Crane in IEEE Transactions on Sonics and Ultrasonics, Vol. SU-25, NO.6, November 1978).
  • GR Crane in IEEE Transactions on Sonics and Ultrasonics, Vol. SU-25, NO.6, November 1978.
  • the object of the invention is to provide a device of the type mentioned at the outset which, with a much simpler structure than before, ensures a reliable differentiation between approved and non-approved coins and the determination of the coin value.
  • the senor is made of a polymeric, elastic material with piezoelectric properties, such as Polyvinylidene fluoride (PVDF), existing transducer, against the sensory surface of which the coins can be pressed with an embossed surface, the imprint pattern of the coinage in the sensory surface being convertible into a signal characterizing the coin by the piezoelectric effect.
  • PVDF Polyvinylidene fluoride
  • the minting of a coin is the actual criterion for authenticity and its value.
  • the similarities between different types of coins are extraordinarily low. Imitation of the embossing also causes a lot of effort, which significantly reduces the incentive to counterfeit.
  • the invention offers the advantage that a simple sensor is sufficient to determine the striking differences in the embossments.
  • FIG. 1A and B show the basic structure of a device according to the invention in plan view and in section.
  • the essential part is a sensor 19, which consists of a polymeric, elastic material 20, the piezoelectric intrinsic owns.
  • An example of such a material 20 is polyvinylidene fluoride, abbreviated PVDF. If a mechanical force acts on this material, an electrical voltage arises at the interfaces, which can be tapped with electrically conductive layers 21 and fed as a measurement signal via electrical conductors 16 to evaluation electronics 22. For shielding, the sensor is surrounded by a non-conductive insulation 18.
  • the one embossing side 16 of a coin 17 is pressed against the sensory surface 23 of the sensor 19.
  • the high points of the three-dimensional surface structure created during coinage come into contact with the sensory surface earlier than the low points and also penetrate deeper with a correspondingly large force on the coin. Due to the piezoelectric effect, the impression sensor created in this way is converted into a measurement signal, the high points of the embossing generating a stronger and / or longer current pulse than the low points.
  • the current pulse is assessed in the evaluation electronics according to the criteria strength and / or time course.
  • the same coins are similar, while different coin types and values differ.
  • FIG. 2 shows the sensor 19 in a stationary bearing 24.
  • the coin 17 is guided with an embossing side 16 onto the sensory surface 23 and is generated by its own weight and / or by an additional specific force exerted on the coin by a pressure stamp 25 is the characteristic impression pattern.
  • the senor 19 is arranged on the side of a pressure stamp 26 facing the coin.
  • FIG. 4 shows how two sensors 19 can simultaneously take 16 impression patterns from both embossing sides. Two measurement signals are generated which, in their combination, greatly reduce the likelihood of similarities to different coin types and values.
  • FIG. 5 shows two sensors 19 which have the shape of a lateral surface of a straight cylinder, since they are arranged on cylindrical, rotatable holders 27. Other rounded, rollable shapes are also possible for the sensors.
  • the coinage 16 to be checked is unrolled on the sensor surfaces 23 in such a way that a line pattern is produced line by line as the holder rotates continuously.
  • FIG. 6 shows two sensors which, like their holders 28, have the shape of segments of cylindrical outer surfaces.
  • the embossing sides 16 are also rolled off tangentially.
  • the holders 28 are returned to the starting position by springs 29.
  • the limited, back and forth rotary movement offers the advantage of an uninterrupted line connection to the sensors.
  • the sensory surface of the sensor can be divided into individual sensory areas 30 in accordance with a grid. Shown is a top view of the sensory surface with the sensory areas 30 delimited by a suitable insulation 31.
  • the correspondingly generated, rasterized impression pattern can also be analyzed by means of geometric assignment in addition to the above-mentioned evaluation criteria with systems of pattern recognition.
  • the weight of the coin can be determined in addition to the embossing.
  • the Coin only loaded by its own weight on the sensory surface.
  • the strength of the resulting current pulse can be analyzed in the evaluation electronics as a measure of the coin weight.
  • the distance traveled by the sensor or sensors or the pressure stamp from the initial position to the pressed test position can be used as a measure of the thickness of the coin.
  • the setting of the test parameters can be selected so that either with constant pressure, with constant depth of penetration of the sensor material into the coinage and finally with constant feed and penetration speed until the pressed end position is reached.
  • a material inspection can be carried out using the PVDF film by pulling the coins against the piezoelectric sensor by means of a magnet with a certain magnetic force.
  • the electrical signal generated results from the combination of the magnetic properties and the coinage.
  • versions according to FIGS. 5 and 6 with rotating sensors are preferred. It is possible to mount at least one of the sensors or a pressure roller provided in its place so that the center distance between the two rotating parts is variable. If, in the starting position, the gap between the two sensors or between a sensor and a pressure roller is chosen to be at most as large as the minimum thickness of a coin to be tested, and when inserting a coin into the gap, the axes of rotation of the two rotating parts can be moved apart against a restoring force according to the actual thickness of the coin, the amount of axial displacement can be evaluated as a criterion for the thickness of the coin.
  • the supplementary test with the narrow pair of sensors additionally produces characteristic edge peaks and a large number of intermediate peaks when the coin runs up and down. Since the signal peak in particular is much larger than the intermediate peaks when the coin comes up, it may be advisable to switch to a larger signal gain immediately after the first edge peak.
  • the coin diameter and the size of the coin can be determined from the distance between the edge peaks, so that no further measurement processes are required.
  • two rotating sensors according to FIG. 5 or 6 can be used, the overall width of which is greater than the maximum coin diameter, but the outer surface of which is broken down into a large number of narrow, essentially cylindrical outer surfaces.
  • a characteristic signal curve can then be obtained from each of these narrow sensor areas in accordance with the area of the coin over which they roll, that is to say a large number of geometrically assignable information items that can be analyzed with electronic systems of pattern recognition with a single test procedure.
  • the sensitivity of the sensors can be influenced by the hardness or compliance of their sensory surfaces. For this, it is sufficient to select the non-conductive insulation 18 according to FIG. 1B according to a suitable thickness and material elasticity. A thicker insulation 18 of the sensory surface of a fixed or rotating sensor has an effect naturally, when testing small surface areas of the coins, they look stronger than when performing an integral test, where the ratio of the raised and depressed areas of the embossed image is determined for the entire coin. Other parameters of the signal resolution and sensitivity are the radius of the sensor, the thickness of the sensor material and the flexibility of the base and the support.
  • the invention also offers a very simple possibility of excluding recognition errors in the case of more or less heavily worn coins. Since the embossments wear on both sides essentially to the same extent, the ratio of the raised areas or the recessed areas on both sides does not change, or changes only very slightly. One can thus determine the quotients of the integral signals or the signals of certain surface areas on both sides in the evaluation electronics and thus obtain a characteristic of a certain coin type that remains the same even with increasing wear.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
EP86109729A 1985-07-24 1986-07-16 Dispositif muni d'un capteur pour l'identification de pièces de monnaie Withdrawn EP0209842A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3526378 1985-07-24
DE19853526378 DE3526378A1 (de) 1985-07-24 1985-07-24 Vorrichtung mit einem sensor zur erkennung von muenzen

Publications (2)

Publication Number Publication Date
EP0209842A2 true EP0209842A2 (fr) 1987-01-28
EP0209842A3 EP0209842A3 (fr) 1988-04-06

Family

ID=6276560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109729A Withdrawn EP0209842A3 (fr) 1985-07-24 1986-07-16 Dispositif muni d'un capteur pour l'identification de pièces de monnaie

Country Status (4)

Country Link
US (1) US4726458A (fr)
EP (1) EP0209842A3 (fr)
JP (1) JPS6258101A (fr)
DE (1) DE3526378A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0432996A1 (fr) * 1989-12-14 1991-06-19 Maygay Machines Limited Dispositif pour la vérification de la délivrance de pièces de monnaie
WO2015031922A1 (fr) 2013-09-09 2015-03-12 Economa Engineering Gmbh Procédé de contrôle de la surface d'objets et pièce de monnaie munie d'une caractéristique d'authenticité
EP3699875A1 (fr) * 2019-02-22 2020-08-26 Crane Payment Innovations GmbH Procédé et dispositf de vérification d'une pièce de monnaie

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5220614A (en) * 1991-02-22 1993-06-15 Professional Coin Grading Service, Inc. Automated coin grading system
DE19922489A1 (de) 1999-05-15 2000-11-23 Nat Rejectors Gmbh Verfahren zur Erkennung der räumlichen Konfiguration von Münzen
US6907977B1 (en) * 2000-01-28 2005-06-21 Cashcode Company Inc. Capacitance sensor for coin evaluation
DE10045052A1 (de) 2000-09-12 2002-03-28 Nat Rejectors Gmbh Verfahren zur Erkennung von Münzen in einem Münzautomaten
CA2415301A1 (fr) * 2002-12-30 2004-06-30 Reza H. Shah Dispositif manuel d'alimentation pour appareil electronique portatif

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH470038A (de) * 1966-08-05 1969-03-15 Siemens Ag Anordnung zur Münzprüfung aufgrund der Prägebilder
CH479128A (de) * 1968-06-07 1969-09-30 Sodeco Compteurs De Geneve Münzprüfvorrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1236870A (en) * 1916-06-09 1917-08-14 Edward F Henson Coin-selector.
BE794880A (fr) * 1972-02-03 1973-05-29 Seeburg Corp Dispositif generateur d'impulsions de credit pour appareils de vente automatiques
US4485321A (en) * 1982-01-29 1984-11-27 The United States Of America As Represented By The Secretary Of The Navy Broad bandwidth composite transducers
US4577510A (en) * 1984-09-06 1986-03-25 The United States Of America As Represented By The Secretary Of The Air Force Dynamic polymer pressure transducer with temperature compensation
GB2168185B (en) * 1984-12-05 1987-09-23 Mars Inc Checking coins

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH470038A (de) * 1966-08-05 1969-03-15 Siemens Ag Anordnung zur Münzprüfung aufgrund der Prägebilder
CH479128A (de) * 1968-06-07 1969-09-30 Sodeco Compteurs De Geneve Münzprüfvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON SONICS AND ULTRASONICS, Band SU-25, Nr. 6, November 1978, IEEE; G.R. CRANE: "Poly(vinylidene) fluoride used for piezoelectric coin sensors" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0432996A1 (fr) * 1989-12-14 1991-06-19 Maygay Machines Limited Dispositif pour la vérification de la délivrance de pièces de monnaie
WO2015031922A1 (fr) 2013-09-09 2015-03-12 Economa Engineering Gmbh Procédé de contrôle de la surface d'objets et pièce de monnaie munie d'une caractéristique d'authenticité
EP3699875A1 (fr) * 2019-02-22 2020-08-26 Crane Payment Innovations GmbH Procédé et dispositf de vérification d'une pièce de monnaie

Also Published As

Publication number Publication date
DE3526378A1 (de) 1987-02-05
EP0209842A3 (fr) 1988-04-06
JPS6258101A (ja) 1987-03-13
US4726458A (en) 1988-02-23

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