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WO2008010434A1 - Dispositif d'identification de pièces de monnaie - Google Patents

Dispositif d'identification de pièces de monnaie Download PDF

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Publication number
WO2008010434A1
WO2008010434A1 PCT/JP2007/063708 JP2007063708W WO2008010434A1 WO 2008010434 A1 WO2008010434 A1 WO 2008010434A1 JP 2007063708 W JP2007063708 W JP 2007063708W WO 2008010434 A1 WO2008010434 A1 WO 2008010434A1
Authority
WO
WIPO (PCT)
Prior art keywords
coin
switching
circuit
unit
sensor
Prior art date
Application number
PCT/JP2007/063708
Other languages
English (en)
Japanese (ja)
Inventor
Satoshi Miyauchi
Takehiko Nara
Tooru Ueki
Kouji Ikeda
Original Assignee
Panasonic Corporation
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
Priority claimed from JP2007108898A external-priority patent/JP5130773B2/ja
Application filed by Panasonic Corporation filed Critical Panasonic Corporation
Priority to CN2007800267824A priority Critical patent/CN101490724B/zh
Priority to US12/303,325 priority patent/US20090242354A1/en
Publication of WO2008010434A1 publication Critical patent/WO2008010434A1/fr

Links

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 present invention relates to a coin identifying device mounted on a vending machine or the like.
  • FIG. 21 is a front perspective view showing a schematic configuration of a conventional coin identifying device.
  • This coin discriminating device includes a casing 1, an insertion slot 3, a passage 4, three sensors 5, 6, 7, a gate 8, a return passage 9, a sorting passage 10, an identification portion 11, And a storage cylinder 12.
  • a slot 3 for receiving the coin 2 is provided above the casing 1, and the passage 4 is connected to the slot 3 and is inclined downward.
  • the sensors 5, 6 and 7 are provided on the side wall surface of the passage 4.
  • Gate 8 is provided at the end of passage 4.
  • the return passage 9 is connected to one side of the gate 8, and the distribution passage 10 is connected to the other side of the gate 8.
  • the storage cylinder 12 stores the coins 2 distributed by the distribution passage 10.
  • the identification unit 11 is provided with the outputs of sensors 5, 6, and 7.
  • the dedicated sensors 5, 6, and 7 are independently mounted to obtain the unevenness, material, and thickness characteristics of the coin 2.
  • Sensors 5, 6, and 7 are installed sequentially from the upstream side of passage 4, and two of these cannot be installed at the same location. Therefore, the unevenness, material and thickness of the coin 2 are detected independently without being associated with each other at different locations. Therefore, the same part of coin 2 It is difficult to detect the relationship between unevenness, material, and thickness at the position, and there is a limit to the precise identification of coins 2.
  • Patent Document 1 JP-A-2006-59139
  • the present invention is a coin discriminating apparatus that can also detect the mutual relationship between two features in the same part of a coin.
  • the coin identification device of the present invention includes a detection unit, a first switching unit, a storage unit, and a control unit.
  • the detection unit includes a first sensor including a pair of coils and an oscillation circuit, and is supplied with a voltage from a power supply and outputs a detection signal that changes as a coin passes between the coils.
  • the first switching unit switches the magnetic connection of the coil between the in-phase connection and the reverse-phase connection multiple times while the coin passes between the coils.
  • the control unit determines the authenticity and type of the coin by comparing the detection signal from the detection unit with the reference signal stored in the storage unit. In this way, since the first switching unit switches the magnetic connection of the coil between the in-phase connection and the reverse-phase connection a plurality of times while the coin passes between the coils, the correlation between the features of the same part of the coin can be established. Can be detected.
  • FIG. 1 is a front perspective view showing a schematic configuration of a coin identifying device according to Embodiment 1 of the present invention.
  • FIG. 2 is a block diagram for simplifying and explaining the configuration of the coin identifying device according to the first to fourth embodiments of the present invention.
  • FIG. 3 is a cross-sectional view showing a first state of the first sensor constituting the coin identifying device shown in FIG.
  • FIG. 4 is a sectional view showing a second state of the first sensor shown in FIG.
  • FIG. 5 is a circuit diagram showing a connection configuration between the first switching unit and the first sensor shown in FIG. 2.
  • FIG. 6 is a circuit diagram showing the connection configuration of the third switching unit, the first sensor, and the capacitor group shown in FIG.
  • FIG. 7 is an output waveform diagram output from the first and second sensors of the coin discriminating apparatus shown in FIG.
  • FIG. 8 is an enlarged view of each waveform shown in FIG. 7 and shows the output signal waveform of each part. It is.
  • FIG. 9 is a block diagram of the coin identifying device according to the first exemplary embodiment of the present invention.
  • FIG. 10 is a circuit diagram of the tuning circuit and the detection circuit in FIG. 9 and the vicinity thereof.
  • FIG. 11 is a circuit diagram of an electronic switch which is a switching unit in FIG.
  • FIG. 12 is a tuning characteristic diagram according to the difference in coin material.
  • FIG. 13 is a tuning characteristic diagram according to the difference in coin thickness.
  • FIG. 14 is a cross-sectional view of a coin to be identified in the second embodiment of the present invention.
  • FIG. 15 is a characteristic diagram showing a change in the output voltage of the tuning circuit with respect to the depth from the upper surface of the coin shown in FIG.
  • FIG. 16 is a circuit diagram showing a part of the tuning circuit of the coin discriminating apparatus according to Embodiment 3 of the present invention.
  • FIG. 17 is a block diagram of a coin identifying device according to Embodiment 4 of the present invention.
  • FIG. 18 is a circuit diagram of the oscillation unit in FIG.
  • FIG. 19 is a diagram showing output waveforms output from the first and second sensors of the coin discriminating apparatus shown in FIG. 17 and output signal waveforms of each part.
  • FIG. 20 is a circuit diagram showing an example of a buffer circuit applied to the first and fourth embodiments.
  • FIG. 21 is a front perspective view showing a schematic configuration of a conventional coin identifying device.
  • FIG. 1 is a front perspective view showing a schematic configuration of a coin identifying device 21 according to Embodiment 1 of the present invention.
  • the coin identification device 21 includes a housing 22, an insertion slot 23, a passage 24, a first sensor 25 (hereinafter referred to as sensor 25), a second sensor 26 (hereinafter referred to as sensor 26), a gate 27, and a return.
  • P passage 28, distribution passage 29, and storage cylinder 30 are provided.
  • An insertion port 23 for receiving the coin 20 is provided above the housing 22, and is connected to the passage 24 via a snubber 24A.
  • the passage 24 is provided downwardly with an inclination of about 10 ° to 12 °.
  • the sensors 25 and 26 are mounted on the side wall surface of the passage 24 in this order.
  • the diameter of the sensor 25 is 8.3 mm, and the diameter of the sensor 26 is 12.5 mm.
  • the 25 and 26 are mounted such that the distance from the bottom surface to the center of the passage 24 is 13.25 mm, for example. Further, the centers of the sensors 25 and 26 are, for example, 25.Omm apart.
  • the gate 27 is provided at the end of the passage 24, and distributes the coins 20 by authenticity.
  • the return passage 28 through which the false coins are introduced is connected to one side of the gate 27, and the sorting passage 29 through which the true coins are introduced is connected to the other side of the gate 27.
  • the storage cylinder 30 is connected to the distribution passage 29 and stores the coins 20 distributed by the distribution passage 29 in denominations.
  • FIGS. Figure 2 3 is a block diagram for simplifying and explaining the configuration of the coin identifying device 21.
  • FIG. 3 and 4 are sectional views of the sensors 25 and 26.
  • FIG. 3 and 4 are sectional views of the sensors 25 and 26.
  • the coin discriminating device 21 includes, as an electric circuit, sensors 25 and 26, an oscillation circuit 90, a first capacitor group 731 and 732, a first switching rod, a second switching rod, 3 A switching unit, a shaping unit 94, a control unit 95, and a storage unit 49 are provided.
  • the sensor 25 and the capacitor group 731, the sensor 26 and the capacitor group 732, and the oscillation circuit 90 constitute a detection unit 96.
  • the control unit 95 is connected to a storage unit 49 in which reference signals are stored in advance. The control unit 95 determines the authenticity and type of the coin 20 by comparing the detection signal input through the shaping unit 94 and the reference signal stored in the storage unit 49.
  • the sensors 25 and 26 will be described with reference to FIGS. 3 and 4.
  • the sensor 25 is configured by winding coils 42A and 42B with force S on ferrite cores 41A and 41B mounted on both side walls of the passage 24, respectively.
  • the sensor 26 is configured by winding coils 44A and 44B around ferrite cores 43A and 43B mounted to face both side walls of the passage 24, respectively.
  • the sensors 25 and 26 since the sensors 25 and 26 have basically the same configuration, the sensor 25 will be described as a representative.
  • FIG. 3 shows the magnetic field lines 50A when the coil 42A and the coil 42B are connected in series and in phase.
  • the magnetic field lines 50A are output in a direction penetrating the coin 20 in the passage 24, and mainly detect the characteristics of the material of the coin 20 efficiently.
  • FIG. 4 shows the state of the magnetic lines of force 50B when the coil 42A and the coil 42B are connected in series and reverse phase.
  • the magnetic field lines 50B are output in a direction limited by the coins 20 in the passage 24, and mainly detect the unevenness and thickness characteristics of the coins 20 efficiently.
  • the detection unit 96 having the sensor 25 including the pair of coils 42A and 42B and the oscillation circuit 90 generates a detection signal that changes as the coin 20 passes between the coils 42A and 42B. Output.
  • the principle of acquiring different information of the coin 20 by switching the magnetic connection between the coil 42A and the coil 42B to the series in-phase connection and the series anti-phase connection in this way will be described later.
  • the force connecting the coil 42A and the coil 42B in series is not limited to the series connection.
  • Parallel connection that is, parallel in-phase connection and parallel anti-phase connection may be switched.
  • changes are large and minute changes can be detected.
  • stable output can be detected by parallel connection.
  • the sensor 26 has the same configuration as the sensor 25, and the diameter of the sensor 26 is larger than the diameter of the sensor 25. Therefore, by switching between the in-phase connection and the reverse-phase connection, the sensor 25 can detect the material information and unevenness information of the coin 20, and the sensor 26 can detect the material information and thickness information.
  • FIG. 5 is a circuit diagram showing a connection configuration between the sensor 25 including the coils 42A and 42B, the switching units 71A and 71B constituting the first switching unit 91, and the switching unit 71J.
  • the switching unit 71A is short-circuited and the switching unit 71J is connected to the lower side of the figure, the coils 42A and 42B are connected in series and in phase.
  • the switching unit 71B is short-circuited and the switching unit 71J is connected to the upper side of the figure, the coils 42A and 42B are connected in series in reverse phase.
  • the first switching unit 91 switches the magnetic connection of the coils 42A and 42B between the series in-phase connection and the series anti-phase connection. Similarly, the first switching unit 91 switches the connection of the coils 44A and 44B in the sensor 26 to a series in-phase connection and a series anti-phase connection, respectively.
  • FIG. 6 shows a connection configuration of the sensor 25 including the coils 42A and 42B, the switching units 71E and 71F configuring the third switching unit 93, and the capacitors 73A and 73B included in the capacitor group 731.
  • the third switching unit 93 switches the capacitors 73A and 73B connected to the sensor 25.
  • the capacitors 73 A and 73 B have different electrostatic capacities, and are included in the capacitor group 731. Since the capacitors 73A and 73B are provided independently as described above, the frequency adjustment of the series in-phase connection and the series anti-phase connection can be easily performed.
  • the capacitor group 732 includes two capacitors independently, and the third switching unit 93 includes capacitors 44A and 44B force S of the sensor 26 according to the series in-phase connection and the series anti-phase connection. Select and switch to adjust the frequency.
  • the detection unit 96 includes a plurality of capacitors 73A and 73B having different capacitances, and the third switching unit 93 switches the capacitors 73A and 73B connected to the sensor 25 or the sensor 26.
  • Capacitor group 731 732 may be connected in series and / or in parallel using a plurality of capacitors having the same capacitance, in addition to the capacitors having different capacitances. That is, the configuration of the capacitor groups 731 and 732 is not limited as long as the third switching unit 93 switches the capacitance connected to the sensors 25 and 26 to a value suitable for in-phase connection and reverse-phase connection.
  • the third switching unit 93 performs frequency adjustment by selecting and switching a capacitor depending on whether the coils 44A and 44B of the sensor 26 are connected in series in-phase or in series.
  • the frequency may be changed by selecting and switching the capacitor without changing the connection of the coils 44A and 44B of the sensor 26. That is, the frequency adjustment by the third switching unit 93 is not limited to the operation at the same time when the first switching unit 91 switches the in-phase connection and the reverse-phase connection of the coils 44A and 44B. Even by changing the frequency, the force S can be used to detect different coin characteristics.
  • the second switching unit 92 plays a role of switching the detection signal output from the detection unit 96 including the sensors 25 and 26 and sending it to the control unit 95 via the shaping unit 94.
  • FIG. 7 shows an envelope waveform obtained by detecting the outputs of the sensors 25 and 26 when the coin 20 passes between the coils 42A and 42B and the coils 44A and 44B, and smoothing the outputs.
  • the output waveform 52 is obtained when the coils 42A and 42B of the sensor 25 are connected in series and in phase
  • the output waveform 53 is obtained when the coils 42A and 42B are connected in series and out of phase.
  • the output waveform 54 is obtained when the coils 44A and 44B of the sensor 26 are connected in series and in phase
  • the output waveform 55 is obtained when the coils 44A and 44B are connected in series anti-phase.
  • the first switching unit 91 switches the connection of the coils 42A and 42B to the series in-phase connection and the series anti-phase connection.
  • the third switching unit 93 selects and switches the force for connecting the capacitor 73A to the sensor 25 and the force for connecting the capacitor 73B. Therefore, for example, at time 56A, the series in-phase connection waveform level 52A indicating the characteristics of the material of the coin 20 and the series anti-phase connection waveform level 53A indicating the unevenness of the coin 20 are detected almost simultaneously with the force S. Monkey.
  • the sensor 25 having a diameter of 8.3 mm and the sensor 26 having a diameter of 12.5 mm are separated by 25. Omm. Are arranged. Therefore, when a coin 20 having a diameter of 14.60 mm or more flows between the sensors 25 and 26, the coin 20 is detected by both the sensors 25 and 26. Therefore, the sensor 25 can detect the series in-phase connection waveform level 52A and the series anti-phase connection waveform level 53A, and the sensor 26 can detect the series in-phase connection waveform level 54A and the series anti-phase connection waveform level 55A almost simultaneously. .
  • the control unit 95 performs switching operations in the first switching unit 91, the second switching unit 92, and the third switching unit 93.
  • a microcomputer that performs dedicated switching control may be prepared, and the first switching unit 91, the second switching unit 92, and the third switching unit 93 may be switched at a predetermined timing.
  • the first switching unit 91 switches the coils 44A and 44B to the series in-phase connection and the series anti-phase connection. Therefore, the sensor 26 can detect the series in-phase connection waveform level 54A indicating the characteristics of the material of the coin 20 at the time 56A and the series anti-phase connection waveform level 55A indicating the characteristics of the thickness of the coin 20 almost simultaneously.
  • the material and the unevenness information are detected at the same location of the coin 20 by the waveform levels 52A and 53A of the sensor 25.
  • the material and thickness information are detected at the same location of the coin 20 by the waveform levels 54A and 55A of the sensor 26.
  • mutual information between the sensor 25 and the sensor 26 can be detected. Therefore, the coin 20 can be identified more precisely.
  • FIG. Fig. 8 shows an enlarged view of each waveform shown in Fig. 7.
  • the full span on the horizontal axis represents lmsec time.
  • the first switching unit 91 divides this lmsec into four time zones 6;!-64 each of 250 sec.
  • the second switching unit 92 switches the output from the sensors 25 and 26 to the shaping unit 94 in conjunction with the first switching unit 91.
  • the control unit 95 sequentially captures the outputs of the sensors 25 and 26 via the shaping unit 94.
  • the coils 42A and 42B of the sensor 25 are connected in series and in phase, and the characteristics of the material of the coin 20 are mainly detected.
  • the coils 42A and 42B of the sensor 25 are connected in series in reverse phase, and the unevenness of the coin 20 is mainly detected.
  • the coils 44A and 44B of the sensor 26 are connected in series and in phase, and the characteristics of the material of the coin 20 are mainly detected.
  • the coils 44A and 44B of force S of the sensor 26 are connected in series in reverse phase, and the thickness of the coin 20 is mainly detected.
  • the control unit 95 can receive two pieces of information per sensor at the same place of the coin 20 by the action of the first switching unit 91. As a result, even if the number of sensors is reduced, the necessary number of types of information can be acquired, the identity of the information acquisition positions is increased, and the identification accuracy is improved. As described above, when four types of information are acquired during lmsec, the speed at which the coin 20 passes through the passage 24 is about 0.2 m / sec, so the position of the coin 20 from which the information is acquired is 0.2 mm. Within the range. Also, since the shaping unit 94 can be shared by providing the second switching unit 92, the circuit configuration can be simplified and the cost can be reduced.
  • FIG. 9 is a specific block diagram of the coin identification device 21.
  • FIG. 10 is a circuit diagram of the tuning circuit 40 and the detection circuit 45 in FIG. 9 and the vicinity thereof.
  • a crystal resonator 35 oscillates at, for example, 8 MHz, and is connected to an oscillator 37 in the microcomputer 36.
  • a clock signal is output from the oscillator 37, and this clock signal is connected to the frequency divider 38 and the switching control unit 39. That is, the crystal unit 35, the oscillator 37, and the frequency divider 38 constitute the oscillation circuit 90 in FIG.
  • the oscillation circuit 90 is a separately-excited oscillation circuit that separately oscillates a tuning circuit 40 described later at a predetermined frequency regardless of the inductance values of the sensors 25 and 26.
  • the output of the frequency divider 38 is connected to a tuning circuit 40 including the sensors 25 and 26.
  • the coinlets 42A, 42B, 44A, and 44B are connected to capacitors 73A to 73D to form a tuning circuit 40. That is, the tuning circuit 40 and the switching control unit 39 constitute the detection unit 96, the first switching unit 91, and the second switching unit 92 in FIG.
  • the connection in the tuning circuit 40 is electronically switched by the output of the switching control unit 39. Further, the frequency division ratio of the frequency divider 38 is switched based on the output of the switching control unit 39.
  • the output of the tuning circuit 40 is input to the detection circuit 45.
  • the detection circuit 45 includes a detection circuit, a peak hold circuit, and a reset circuit that resets the peak hold circuit. Yes.
  • the reset circuit in the detection circuit 45 is reset by the output of the switching control unit 39.
  • the output of the detection circuit 45 is connected to an identification circuit 47 through an analog / digital converter (A / D converter) 46.
  • a / D converter analog / digital converter
  • the peak hold circuit and reset circuit of the detection circuit 45, and the A / D converter 46 shape the detection signal from the tuning circuit 40 and output an envelope waveform to the discrimination circuit 47. These constitute the shaping unit 94 in FIG.
  • the output of the identification circuit 47 is connected to the output terminal 48. From the output terminal 48, data indicating the authenticity and denomination of the inserted coin 20 is output. That is, the identification circuit 47 and the switching control unit 39 constitute the control unit 95 in FIG.
  • the offset switching circuit 69 connected between the frequency divider 38 and the tuning circuit 40 will be described later.
  • the frequency division ratio of the frequency divider 38 is switched by the switching control unit 39.
  • the frequency divider 38 outputs signals 61A to 64A having different frequencies.
  • the frequency divider 38 switches the frequency division ratio so as to output a signal 61A having a frequency of 100 kHz to the coils 42A and 42B during the time zone 61, for example.
  • the frequency divider 38 switches the frequency division ratio during the time zone 62 and outputs, for example, a signal 62A having a frequency of 120 kHz to the coils 42A and 42B.
  • the frequency division ratio is switched, for example, a signal 63A with a frequency of 170 kHz is output to the coils 44A and 44B, and a signal 64 with a frequency 2151 Output to.
  • tuning circuit 40 Upon receiving signals 61A-64A, tuning circuit 40 receives signals in time zone 6;! -64, respectively.
  • 61B to 64B are output. As shown in the figure, it takes about 100 seconds until the operation of the tuning circuit 40 becomes stable and its output becomes substantially constant.
  • the switching control unit 39 outputs reset signals 61C to 64C of 50 sec at the end of each time zone 6;! To 64, respectively. Based on these reset signals, the peak hold circuit in the detection circuit 45 is reset.
  • the detection circuit 45 detects the signals 61B to 64B output from the tuning circuit 40, peaks them, and outputs the signals 61D to 64D. Since the detection circuit 45 has a reset circuit, it is reset by using the reset signals 61C to 64C at the end of each time zone 6;! To 64 so as not to be affected by the previous time.
  • a / D converter 46 signals 61D to 64 D is converted into a digital quantity and supplied to the identification circuit 47.
  • the time for the coin 20 to pass the sensors 25 and 26 is about 100 msec. Therefore, for each coin 20, the sensors 25 and 26 sequentially extract features at different points of 100 points each.
  • switching between the in-phase connection and the reverse-phase connection and switching of the sensors 25 and 26 are switched by the switching control unit 39, and 400 feature data are acquired in 100 msec. That is, the switching control unit 39 performs 400 switching (100 points X 2 X 2)!
  • the identification circuit 47 can identify the coin 20 even if the timing to reach the position of the sensors 25 and 26 after the coin 20 is inserted is not measured. Feature data required for That is, the switching control unit 39 and the identification circuit 47 do not have to be linked.
  • the unevenness and material of the coin 20 are detected by the sensor 25, and the thickness and material of the coin 20 are detected by the sensor 26, so that the coin 20 is accurately identified.
  • the unevenness or thickness of the coin 20 and the material can be identified by switching the sensor between in-phase connection and reverse-phase connection. The following describes the number of switching required when using one sensor!
  • the switching by the switching control unit 39 is slow, precise features of the coin 20 cannot be detected. For at least one sensor, it is necessary to acquire the characteristics of coins 20 at different points of 5 points or more. Furthermore, when switching between in-phase connection and reverse-phase connection is considered, it is necessary to switch 10 times or more within the transit time of the coin 20. In addition, the faster the switching by the switching control unit 39, the more accurate detection information can be acquired. However, making it faster than necessary increases the burden on the microcomputer 36. From the above, the switching by the switching control unit 39 is preferably 10 to 1000 times for one sensor.
  • a tuning circuit 40 is connected between the collector of the transistor 66 and the power source 70.
  • the input terminal 65 is connected to the output of the frequency divider 38 and is connected to the base of the transistor 66 through the resistor 67A.
  • a resistor 67B is connected between the base of the transistor 66 and the ground, and an offset switching circuit 69 is connected to the emitter of the transistor 66.
  • the output of the tuning circuit 40 is input to the detection circuit 45 via the terminal 72.
  • the tuning circuit 40 will be described.
  • One terminal of each of the switching units 71A to 71D is connected to the power source 70.
  • the other terminal of the switching unit 71A is connected to one terminal of the switching unit 71E, one selection terminal of the switching unit 71J, and the other terminal of the coil 42A.
  • the common terminal of the switching unit 71J is connected to the other terminal of the coil 42B, and one terminal of the coil 42B is connected to the terminal 72 connected to the collector of the transistor 66.
  • the other terminal of the switching unit 71E is connected to the terminal 72 via the capacitor 73A.
  • the other terminal of the switching unit 71B is connected to one terminal of the coil 42A, the other selection terminal of the switching unit 71J, and one terminal of the switching unit 71F.
  • the other terminal of the switching unit 71F is connected to the terminal 72 via the capacitor 73B.
  • the other terminal of the switching unit 71C is connected to one terminal of the switching unit 71G, one selection terminal of the switching unit 71K, and the other terminal of the coil 44A.
  • the common terminal of the switching unit 71K is connected to the other terminal of the coil 44B, and one terminal of the coil 44B is connected to the terminal 72.
  • the other terminal of the switching unit 71G is connected to the terminal 72 via the capacitor 73C.
  • the other terminal of switching unit 71D is connected to one terminal of coil 44A, the other selection terminal of switching unit 71K, and one terminal of switching unit 71H.
  • the other terminal of the switching unit 71H is connected to the terminal 72 via the capacitor 73D.
  • switching units 71A to 71D switching units 71E to 71H, and a switching unit
  • 71J and 71K are sequentially switched by the switching control unit 39 in time zone 6;!-64 shown in FIG. That is, in time zone 61, switching unit 71A and switching unit 71E are short-circuited, and switching unit 71J is switched to the other selection terminal side.
  • the coil 42A and the coil 42B are connected in series and in phase.
  • a capacitor 73A is connected in parallel with the series connection body of the coil 42A and the coil 42B.
  • switching unit 71B and switching unit 71F are short-circuited, and switching unit 71J is switched to one selection terminal side.
  • the coil 42A and the coil 42B are connected in series in reverse phase.
  • Capacitor 73B is connected in parallel with the series connection of coil 42A and coil 42B.
  • switching unit 71C and switching unit 71G are short-circuited, and switching unit 71K is switched to the other selection terminal side.
  • the coil 44A and the coil 44B are connected in series and in phase.
  • a capacitor 73C is connected in parallel with the series connection body of the coil 44A and the coil 44B.
  • switching unit 71D and switching unit 71H are short-circuited, and switching unit 71K is switched to one selection terminal side.
  • the coil 44A and the coil 44B are connected in series in reverse phase.
  • a capacitor 73D is connected in parallel with the series connection body of the coil 44A and the coil 44B.
  • the switching units 71A, 71B, 71J constitute a first switching unit 91 for the sensor 25 in FIG.
  • the switching units 71C, 71D and 71K constitute a first switching unit 91 for the sensor 26 in FIG.
  • the switching units 71E and 71F constitute a third switching unit 93 for the sensor 25, and the switching units 71G and 71H constitute a third switching unit 93 for the sensor 26.
  • the switching control unit 39 switches the sensor 25 and the sensor 26 with respect to the detection circuit 45 during 1 msec. That is, the switching units 71A, 71B, 71C, 71D constitute the second switching unit 92 in FIG.
  • each of the switching units 71A to 71D is directly connected to the power source 70. That is, the first switching unit 91 has a set of switching units 71A and 71B and a switching unit 71J for the sensor 25, and the set of switching units 71A and 71B is connected between the sensor 25 and the power source 70. Yes. As a result, the first switching unit 91 can perform switching without adversely affecting the tuning circuit 40 in terms of high frequency.
  • the second switching unit 92 is provided between the power source 70 and the sensors 25 and 26. As a result, the second switching unit 92 can also perform switching without adversely affecting the tuning circuit 40 in terms of high frequency.
  • the connection between the power source 70 and the coils 42A and 44A is switched by the switching units 71A to 71D provided outside the parallel circuit composed of the coil and the capacitor.
  • the A set of switching units 71E and 71F and a switching unit 71J are provided in a parallel circuit of the coils 42A and 42B and one of the capacitors 73A and 73B.
  • a set of switching units 71G and 71H and a switching unit 71K are provided in a parallel circuit of the coils 44A and 44B and any of the capacitors 73C and 73D.
  • switching including the capacitors 73A to 73D can be performed, and it is possible to realize the functions of the first switching unit 91 and the second switching unit 92.
  • the capacitors 73A to 73D forming the tuning circuit 40 are independently provided, the frequency adjustment of the series in-phase connection and the series anti-phase connection can be easily performed.
  • the output of the tuning circuit 40 is output to the terminal 72 and input to the detection circuit 45.
  • the output of the detection circuit 45 is output from the terminal 80 to the A / D converter 46.
  • the detection circuit 45 includes a peak hold circuit 74, a reset circuit 75, an input terminal 76, and a gain switching circuit 77.
  • the peak hold circuit 74 is connected to the terminal 72 and includes a known detection circuit.
  • Reset circuit 75 resets peak hold circuit 74.
  • a reset signal is input to the input terminal 76 from the switching control unit 39 to the reset circuit 75.
  • the gain switching circuit 77 is provided between the output terminal of the peak Honored circuit 74 and the terminal 80.
  • the gain switching circuit 77 includes resistors 78A to 78D connected in series between the input and output of the operational amplifier 77A, and switching units 79A to 79D connected in parallel to the resistors 78A to 78D, respectively. Yes.
  • the switching units 79A to 79D are switched by the switching control unit 39 in correspondence with time zones 6;! To 64 shown in FIG.
  • the gain switching circuit 77 maximizes the gain change width at each output of the sensors 25 and 26 by switching the switching units 79A to 79D between ON and OFF. This increases the signal-to-noise ratio of the signals 61D to 64D and improves the measurement accuracy.
  • gain switching circuit 77 shown in FIG. 10 includes resistors 78A to 78D connected in series and switching units 79A to 79D connected in parallel to resistors 78A to 78D, respectively.
  • the gain switching circuit 77 may be configured by connecting the resistors 78A to 78D in parallel and connecting the switching units 79A to 79D in series to the resistors 78A to 78D.
  • the offset switching circuit 69 includes resistors 67C, 67D, 67E, 67F, and 67G and switching devices 68A to 68D.
  • Resistors 67C, 67D, 67E, 67F, and 67G are connected in series between the emitter of transistor 66 and ground.
  • Switching sections 68A to 68D are connected to both ends of resistors 67D to 67G, respectively.
  • the switching units 68A to 68D are switched by the switching control unit 39 in time zones 61 to 64 in FIG. 8, respectively, and an offset voltage predetermined for each switching is applied to the output voltage of the detection circuit 45. . That is, the offset switching circuit 69 controls the offset voltage to increase the output voltage change width of the detection circuit 45 by switching the switching units 68A to 68D. This increases the signal-to-noise ratio of signals 61D to 64D and improves measurement accuracy.
  • resistors 67D to 67G are connected in series, and the resistors 67D to 67G and switching units 68A to 68D are connected in parallel.
  • the resistors 67D to 67G may be connected in parallel, and the switching units 68A to 68D may be connected in series with the resistors 67D to 67G.
  • the offset voltage may be switched by inserting a plurality of Zener diodes having different Zener voltages in parallel to the input of the peak hold circuit 74 and switching these Zener diodes with an electronic switch.
  • FIG. 11 is a circuit diagram showing one of the switching units 71A to 71K used in the present embodiment.
  • the switching units 71E to 71K used in the tuning circuit 40 it is preferable to use an electronic switch of a type using a field effect transistor (FET). That is, it is preferable that the first switching unit 91 and the second switching unit 92 are configured by FETs that are a plurality of switching elements. This is to improve the isolation of the tuning circuit 40 when switching the frequency.
  • FET field effect transistor
  • This configuration can also be used for the switching units 68A to 68D and the switching units 79A to 79D.
  • a signal controlled by the switching control unit 39 is input to the input terminal 81.
  • a resistor 83A is connected between the input terminal 81 and the base of the transistor 82.
  • a resistor 83B is connected between the base of the transistor 82 and the ground.
  • the emitter of the transistor 82 is directly connected to the ground, and the collector is connected to, for example, a 24 V power supply 84 via a resistor 83C.
  • the collector of the transistor 82 is connected to the gate of the N-channel FET 85A via the resistor 83D.
  • the collector of the transistor 82 is also connected to the gate of the N-channel FET 85B through a resistor 83E.
  • the drain of FET85A is connected to one terminal 86A, and the source of FET85A is connected to the source of FET85B.
  • the drain of FET85B is connected to the other terminal 86B!
  • the two FETs 85A and 85B are connected in series. Therefore, the isolation between the terminals 86A and 86B is improved and the high frequency performance is improved. Also, since the switching parts 71E to 71K are composed of FET85A and 85B, the on-resistance can be made extremely small.
  • the switching units 71J and 71K in the tuning circuit 40 may use two electronic switches shown in FIG.
  • FIG. 12 shows the output characteristics of the tuning circuit 40 when the coils 44A and 44B are connected in series in phase, and coins 20 of the same thickness and different materials are inserted, and shows the change of the output voltage with respect to the frequency.
  • a characteristic curve 103 is output when no metal is present in the vicinity of the coils 44A and 44B. Its center frequency is about 150kHz. In addition, the characteristic curves 104 to 107 are output when there is a load in the presence of metal near the coils 44A and 44B. Its center frequency is about 170 kHz.
  • the characteristic curve 104 is when copper is used as the load metal constituting the coin 20, and the characteristic curve 105 is when brass is used as the load metal.
  • the characteristic curve 106 is the case where white copper is used as the load metal, and the characteristic curve 107 is the case where nickel is used as the load metal. In this way, the characteristic curve shows a characteristic level depending on the type of metal as the load.
  • the material of the inserted coin 20 can be detected using this level of characteristics.
  • the center frequency of the tuning circuit 40 is increased by about 20 kHz when there is a load compared to when there is no load. Therefore, if the output frequency output from the frequency divider 38 is set 20 kHz higher than the center frequency at no load, the material of the coin 20 can be detected with high sensitivity.
  • this set frequency is set slightly higher than the peak frequency under load, the stability will be good. That is, the oscillation frequency of the oscillation circuit 90 when the coils 44A and 44B are connected in phase is separated from the tuning frequency before the coin 20 passes between the coils 44A and 44B by a predetermined frequency (for example, 20 kHz). It is preferable to set.
  • the peak frequency at no load is detected by the switching control unit 39 (control unit 95) measuring the output of the A / D converter 46 while changing the frequency according to the frequency division ratio of the frequency divider 38. ing.
  • the detected value is stored in the storage unit 49 in the microcomputer 36.
  • the frequency divider 38 switches the frequency division ratio so as to obtain the frequency stored in the storage unit 49 and corrects the oscillation frequency. In this way, since the change over time and the change in temperature are corrected, the coin 20 can be accurately identified even if the environment changes.
  • the output frequency of the oscillator 37 can be optimized by detecting the peak frequency at no load for each product during production and storing it in the storage unit 49 of each product. For this reason, it is possible to achieve high, high, and discriminating performance that are not affected by variations among products.
  • the switching control unit 39 (control unit 95) is a force S that detects the peak frequency when the coin 20 is not inserted even after shipment, and this measurement range is centered on the peak frequency stored for each product during production. Can be limited to a relatively narrow range (a range narrower than that during production). As a result, the peak frequency detection time can be shortened.
  • FIG. 13 shows an output characteristic of the tuning circuit 40 when the coils 44A and 44B are connected in series in reverse phase and coins 20 having the same quality and different thicknesses are inserted.
  • the characteristic curve 113 is output at no load when no metal is present in the vicinity of the coils 44A and 44B.
  • the characteristic curves 114 to 120 are output when there is a load in which a metal exists in the vicinity of the coils 44A and 44B. In either case, the center frequency is about 215 kHz.
  • the characteristic curve 114 with load causes a loss due to an eddy current of about 0.8 V compared to the characteristic curve 113 with no load. As a result, the voltage level has dropped.
  • the magnitude of the loss varies depending on the thickness of the metal. That is, when the thickness is gradually increased from the characteristic curve 114 of a thin metal, Sex curve 115 ⁇ ; Therefore, the thickness of the inserted coin 20 can be detected using this level of feature. For this reason, it is preferable that the oscillation frequency when the coils 44A and 44B are connected in reverse phase is set to substantially the same frequency as the tuning frequency before the coin 20 passes between the coils 44A and 44B.
  • this frequency is set to an optimum frequency for each product.
  • the same principle applies to the force sensor 25 described for the sensor 26.
  • the magnetic field lines 50B in FIG. 4 do not spread toward the surface of the coin 20. Therefore, when the coils 42A and 42B are connected in reverse phase, information reflecting irregularities of a relatively small area on the surface of the coin 20 can be acquired.
  • the output of the oscillator 37 is supplied to the tuning circuit 40 via the frequency divider 38, and the oscillator 37 is provided independently of the tuning circuit 40. Therefore, even if the impedance of the coils 42A, 42B, 44A, 44B changes due to the influence of the coin 20 or the environment such as the ambient temperature, it does not affect the oscillation frequency of the oscillator 37. can do.
  • the principle of identifying the material of a coin 20 composed of a single material has been described.
  • the principle of identifying the material of the coin 20A composed of two or more kinds of metal clad materials and the corresponding configuration will be described.
  • FIG. 14 is a cross-sectional view of the coin 20A configured as described above.
  • the surface material 131 is white copper
  • the center material 132 is copper. That is, the coin 20A is, for example, 10, 25, 50 cents in the United States.
  • the output characteristics of the tuning circuit 40 vary depending on the coin material.
  • Figure 13 shows the difference in output characteristics when the same material is used and the coin thickness is different.
  • the output voltage is also different when the force S and the coin material are different. Using this difference in output voltage, it is possible to distinguish the surface material 131 and the central material 132 from each other.
  • FIG. 15 is a characteristic diagram showing a change in output voltage of the tuning circuit 40 with respect to the depth from the upper surface of the coin 20A shown in FIG.
  • a characteristic curve 133 shows a case where a signal having an oscillation frequency higher than that of the characteristic curve 134 is input to the tuning circuit 40. At this time, coils 44A and 44B are out of phase. It is connected.
  • the penetration depth varies depending on the frequency. That is, at high frequencies, the magnetic field does not penetrate deeply due to the skin effect, and the influence of the surface material 131 is large. At low frequencies, the magnetic field penetrates deeply, and the surface material 131 and the central material 132 affect the output voltage level. Therefore, the coin 20A can also be identified by the difference in power level between the surface material 131 and the central material 132.
  • FIG. 16 is a circuit diagram showing a part of the tuning circuit in the present embodiment.
  • the sensors 25 and 26 and the capacitors 73A to 73D are connected in parallel.
  • sensors 25 and 26 and capacitors 156 and 158 are connected in series to form a tuning circuit. That is, unlike the first embodiment in that a series tuning circuit is used, the circuit 151 and a circuit having the same configuration as the circuit 151 are connected in parallel and used instead of the tuning circuit 40 in FIG. That is, the circuit 151 shows only the part including the sensor 25.
  • the circuit 151 is inserted between the collector of the transistor 66 and the terminal 72 of the detection circuit 45 in FIG. In this case, since it is a series tuning circuit, the coupling capacitor 72 A connected to the terminal 72 of the detection circuit 45 can be omitted.
  • One terminal 152 of the circuit 151 is connected to one terminal of the coil 42A, and the other terminal of the coil 42A is connected to the switching unit 15 Connected to 4A common terminal.
  • One selection terminal of the switching unit 154A is connected to one terminal of the coil 42B, and the other terminal of the coil 42B is connected to one selection terminal of the switching unit 154B via the capacitor 156.
  • the common terminal of the switching unit 154B is connected to the other terminal 157 of the circuit 151.
  • the other selection terminal of the switching unit 154A is connected to the other terminal of the coil 42B, and one terminal of the coil 42B is connected to the other selection terminal of the switching unit 154B via the capacitor 158. .
  • Switching units 154A and 154B are configured in the same manner as switching units 71J and 71K in the first embodiment. Capacitors 156 and 158 forming the circuit 151 are provided independently. Therefore, the frequency adjustment of the series in-phase connection and the series anti-phase connection can be easily performed.
  • the operation of the circuit 151 configured as described above will be described.
  • the switching units 154A and 154B are switched in the direction indicated by the solid line by the output of the switching control unit 39 in FIG. Then, the coils 42A and 42B are connected in series and in phase, and the capacitor 156 is connected in series to this series connection body. Since the coils 42A and 42B are connected in series and in phase, the material of the coin 20 can be detected efficiently.
  • the Q value that is a value representing the degree of resonance sharpness of the resonance circuit is high.
  • the Q value in a series tuning circuit is expressed by the reciprocal of the product of R, ⁇ and C, where R is the internal resistance included in the tuning circuit, C is the capacitance of the capacitor, and ⁇ is the angular frequency.
  • the first switching unit 91 and the third switching unit 93 in FIG. 2 can be configured only by the switching units 154A and 154B.
  • FIG. 17 is a block diagram centering on the electric circuit of the coin discriminating apparatus 201 in the fourth embodiment.
  • FIG. 18 is a circuit diagram of the oscillation unit 204 in FIG.
  • the basic configuration is real
  • the force S is the same as that in FIG. 2 in the first embodiment, and the configuration of the oscillation circuit 90 is different in the present embodiment. That is, in the first embodiment, the output of the oscillator 37 that oscillates at a fixed frequency is supplied to the tuning circuit 40 via the frequency divider 38.
  • a self-excited oscillation circuit including a tuning circuit 202 having a variable tuning frequency is used.
  • the switching control unit 205 is replaced with the switching control unit 39, the tuning circuit 40, the crystal oscillator 35, the oscillator 37, and the frequency divider 38.
  • An oscillation unit 204 is provided.
  • the switching control unit 205 corresponds to the switching control unit 39, switches the connection in the oscillation unit 204, and switches the gain of the detection circuit 45.
  • the output of the oscillation unit 204 is connected to the detection circuit 45.
  • the switching control unit 205, the A / D converter 46, and the identification circuit 47 are composed of a microcomputer 206, and data indicating the authenticity and denomination of the inserted coin 20 is output from the output terminal 48. That is, in this configuration, the oscillation unit 204 constitutes the detection unit 96 in FIG.
  • the oscillating unit 204 includes a tuning circuit 202 and an amplifying unit 203 for oscillation.
  • the tuning circuit 202 is formed of sensors 25 and 26 and capacitors 221A, 221B and 222A to 222D connected in parallel to the sensors 25 and 26. That is, the oscillation unit 204 self-oscillates. Details of the oscillator 204 will be described later.
  • the switching control unit 205 divides lmsec into four time zones 231, 232, 233, and 234 at equal intervals.
  • Switching control unit 205 Time zone 23; By repeating a series of times from! To 234, the detection circuit 45 successively takes in the outputs of the sensors 25 and 26 sequentially.
  • the coils 42A and 42B of the sensor 25 are connected in series and in phase, and the characteristics of the material of the coin 20 are mainly detected. Further, in the time zone 232, the coils 42A and 42B of the sensor 25 are connected in series in reverse phase, and the unevenness of the coin 20 is mainly detected.
  • the coils 44A and 44B of the sensor 26 are connected in series and in phase, and the characteristics of the material of the coin 20 are mainly detected.
  • the coils 44A and 44B of the sensor 26 are connected in series in reverse phase, and the thickness of the coin 20 is mainly detected.
  • the switching control unit 205 sets the reset signal 23 for 50 seconds at the end of each time zone 23;! Outputs 1A to 234A.
  • a reset circuit 216 is provided in the amplification unit 203.
  • a peak hold circuit 74 is provided in the detection circuit 45. The switching control unit 205 resets the reset circuit 216 and the peak hold circuit 74 by the reset signals 231A to 234A.
  • the oscillator 204 outputs signals 231B to 234B in each time zone 23;! It takes about 100 seconds for the output of the oscillation unit 204 to stabilize and to become substantially constant.
  • the oscillating unit 204 uses the reset circuit 216 to reset at the end of each time zone 23 ;! to 234, and does not affect the subsequent time.
  • the time until the output of the oscillation unit 204 is stabilized can be shortened by using the stabilization unit.
  • the in-phase connection and reverse-phase connection of the sensors 25 and 26 can be switched more frequently, and the identity of the measurement position can be further improved. I'll do it.
  • FIG. 20 is a circuit diagram showing an example of a buffer circuit.
  • the output terminal 215 is connected to the positive input terminal of the op amp 241 via the capacitor 243 and the resistor 242.
  • the negative input terminal of the operational amplifier 241 is connected to the output side of the operational amplifier 241.
  • Such a voltage follower 244 can be used as a buffer circuit.
  • Such a buffer circuit may be used in the first embodiment. That is, a voltage follower 244 may be inserted between the connection terminal 72 and the detection circuit 45.
  • the offset switching circuit 69 in FIG. 10 can be used.
  • the switching control unit 205 controls the offset switching circuit 69 to control the offset voltage for the first 50 sec of each 250 sec switching interval, thereby speeding up the rise of oscillation.
  • the stabilization unit can be realized by controlling the switching units 68A to 68D of the offset switching circuit 69 by the switching control unit 205. Such control may be used in the first embodiment. That is, the switching control unit 39 may control the switching units 68A to 68D as described above.
  • the detection circuit 45 outputs the signal 231B output from the oscillation unit 204 in each time zone 23;! ⁇ 234B is detected, peak-holded, and signals 231C to 234C are output. Since the operation after the detection circuit 45 is the same as that of the first embodiment, the detailed description is omitted.
  • the oscillation unit 204 includes a tuning circuit 202 and an amplification unit 203 connected to the tuning circuit 202 in a positive feedback connection.
  • the input terminal 210 of the amplifying unit 203 is connected to the negative input terminal 211A of the comparator 211.
  • a resistor 212A is connected between the negative input terminal 211A and the positive input terminal 211B.
  • Resistors 212B and 212C are connected in series between the power supply 70 and the ground.
  • the connection point is connected to the positive input terminal 211B, and applies a reference voltage to the positive input terminal 211B of the comparator 211.
  • a capacitor 213 is connected between the positive input terminal 211B and the ground.
  • a feedback resistor is connected between the output terminal 211C and the negative input terminal 211A of the comparator 211.
  • a resistor 212D is connected, and a pull-up resistor 212E is connected between the output terminal 211C and the power supply 70.
  • a resistor 212F is connected between the output terminal 211C of the comparator 211 and the base of the NPN transistor 214.
  • a resistor 212J is connected between the base of the transistor 214 and the ground.
  • a resistor 212G and a resistor 212H are connected in series between the emitter of the transistor 214 and the ground.
  • the resistor 212G is used for offset voltage adjustment, and an appropriate offset voltage is set by the resistor 212G.
  • the offset switching circuit 69 described in Embodiment 1 may be used.
  • the collector of the transistor 214 is connected to the terminal 72 and also connected to the output terminal 215 of the oscillation unit 204.
  • a reset circuit 216 is connected to a connection point between the base of the transistor 214 and the resistor 212F.
  • a resistor 216C is connected between the input terminal 216A and the base of the NPN transistor 216B, and a resistor 216D is connected between the base of the transistor 216B and the ground.
  • the emitter of the transistor 216B is connected to the ground, and the collector is connected to the connection point between the base of the transistor 214 and the resistor 212F.
  • the input terminal 216A of the reset circuit 216 is connected to the switching control unit 205, and the reset circuit 216 is a reset signal. It is reset at the input timing of 231A to 234A. Therefore, the output of the oscillator 204 stops at this timing.
  • the tuning circuit 202 is connected between the terminal 72 and the input terminal 210 and determines the oscillation frequency of the oscillation unit 204.
  • the tuning circuit 202 is substantially the same circuit as the tuning circuit 40 described in the first embodiment, and the difference will be mainly described.
  • the capacitors 221A and 221B are connected in series between the power source 70 and the terminal 72.
  • a connection point between the capacitor 221A and the capacitor 221B is connected to the input terminal 210 of the amplifying unit 203.
  • the tuning circuit 202 is connected between the input of the comparator 211 constituting the amplification unit 203 and the collector (output) of the transistor 214, so that the oscillation unit 204 self-oscillates.
  • a capacitor 222A is connected between the other terminal of switching unit 71E and terminal 72.
  • a capacitor 222B is connected between the other terminal of the switching unit 71F and the terminal 72, and a capacitor 222C is connected between the other terminal of the switching unit 71G and the terminal 72.
  • a capacitor 222D is connected between the other terminal of the switching unit 71H and the terminal 72! /.
  • Capacitors 222A to 222D correspond to capacitors 73A to 73D in the first embodiment, respectively.
  • a series body of capacitors 221A and 221B is connected in parallel between the power supply 70 and the terminal 72.
  • the values of capacitors 222A to 222D are smaller than the values of capacitors 73A to 73D in the first embodiment. Therefore, the tuning frequency is substantially the same as the tuning circuit 40 in the first embodiment.
  • switching of the switching units 71A to 71K is switched by the switching control unit 205.
  • This switching timing is the same as the switching timing of the switching control unit 39 described in the first embodiment.
  • the switching control unit 205 that switches the signal output from the oscillating unit 204 a plurality of times within the time when the coin 20 passes the sensors 25 and 26 is provided. Since the switching control unit 205 switches the signal output from the oscillation unit 204 at a high speed while the coin 20 passes the sensors 25 and 26, a plurality of features in the same part of the coin 20 are mutually switched. Can detect the relationship. Therefore, the identification circuit 47 can perform accurate identification of the coin 20 including the feature of the correlation in the same part.
  • the switching control unit 205 is used to switch the sensors 25 and 26 between in-phase connection for detecting the material of the coin 20 and reverse-phase connection for detecting the material thickness of the coin 20,
  • the 201 can be downsized and the price can be reduced.
  • the frequency divider 38 and the like are not necessary, and the configuration can be configured with fewer parts compared to the first embodiment. .
  • the configuration can be configured with fewer parts compared to the first embodiment. .
  • by always oscillating at the tuning frequency a stable tuning state can be maintained and accurate identification is possible.
  • the same configuration as that of the third switching unit 93 shown in FIG. 6 is applied to one or more of the capacitors 71E to 71H, 221A, and 221B, and the capacitors 71E to 71E 7 It may be switched to a capacitor having a different capacitance from 1H, 221A, and 221B.
  • the oscillation frequency of the oscillation unit 204 changes, and the same effect as in the second embodiment can be obtained.
  • the configuration for identifying the material of the coin 20A made of a plurality of metals by changing the oscillation frequency in this way is applied to a coin identification device that does not switch the magnetic connection of the sensor 25 and the sensor 26. Moyo! /
  • the waveform of the envelope is formed by the shaping unit 94 (detection circuit 45), but the present invention is not limited to this.
  • the coin 20 can be identified by detecting the output voltage immediately before resetting the detection circuit 45 or the peak value of the output voltage at the measurement interval.
  • the coin discriminating device according to the present invention is useful as a coin discriminating device mounted on a vending machine or the like because it can detect and accurately discriminate the mutual relationship between the material and thickness of coins at almost the same position. .

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

Abstract

L'invention concerne un dispositif d'identification de pièces de monnaie, comportant une partie de détection, une première partie de commutation, une partie de mémorisation, et une partie de commande. La partie de détection comprend un premier capteur incorporant une paire de bobines et un circuit oscillant, est alimentée par une source de courant électrique et émet un signal de détection qui varie lorsqu'une pièce de monnaie passe entre les bobines. La première partie de commutation commute de façon répétée le couplage magnétique des bobines entre un couplage en phase et un couplage en inversion de phase lorsque la pièce de monnaie passe entre celles-ci. La partie de commande détermine l'authenticité de la pièce de monnaie en comparant le signal de détection issu de la partie de détection à un signal de référence mémorisé dans la partie de mémorisation.
PCT/JP2007/063708 2006-07-18 2007-07-10 Dispositif d'identification de pièces de monnaie WO2008010434A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2007800267824A CN101490724B (zh) 2006-07-18 2007-07-10 硬币识别装置
US12/303,325 US20090242354A1 (en) 2006-07-18 2007-07-10 Coin discriminating device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006-195252 2006-07-18
JP2006195252 2006-07-18
JP2007-108898 2007-04-18
JP2007108898A JP5130773B2 (ja) 2006-07-18 2007-04-18 硬貨識別装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3196845A4 (fr) * 2014-09-16 2018-05-16 Nippon Conlux Co., Ltd. Dispositif de traitement de pièces de monnaie

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04323580A (ja) * 1991-04-23 1992-11-12 Matsushita Electric Works Ltd 電池容量表示装置
JPH0696324A (ja) * 1992-09-11 1994-04-08 Fuji Electric Co Ltd 硬貨選別装置
JP2002184470A (ja) * 2000-12-11 2002-06-28 Fuji Electric Co Ltd 充放電電流測定装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04323580A (ja) * 1991-04-23 1992-11-12 Matsushita Electric Works Ltd 電池容量表示装置
JPH0696324A (ja) * 1992-09-11 1994-04-08 Fuji Electric Co Ltd 硬貨選別装置
JP2002184470A (ja) * 2000-12-11 2002-06-28 Fuji Electric Co Ltd 充放電電流測定装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3196845A4 (fr) * 2014-09-16 2018-05-16 Nippon Conlux Co., Ltd. Dispositif de traitement de pièces de monnaie

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