JP6814499B1 - Coin identification sensor and coin identification method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coin identification sensor capable of reducing coils and simplifying a circuit configuration while outputting a detection signal capable of identifying bicolor coins. SOLUTION: A penetrating magnetic sensor 3 for detecting a change in magnetic flux due to a material and a diameter dimension on the outer peripheral side of a coin 2 and a first non-penetrating sensor 3 for detecting a change in magnetic flux due to a material on the central side of the coin 2. A first resonance circuit 21 configured by connecting a capacitor C1 to a first coil 7 wound around a type magnetic sensor 4 and a penetrating magnetic sensor 3 and also used as an exciting coil and a detection coil. A second coil 9 wound around the first non-penetrating magnetic sensor 4 and also used as an exciting coil and a detection coil, and a second resonant circuit 22 configured by connecting a capacitor C2 to the second coil 9. , And detects and outputs the amplitude and phase of the vibration decay wave output from the resonance circuits 21 and 22 according to the oscillation induction wave. [Selection diagram] Fig. 4

Description

The present invention relates to a coin identification sensor及beauty coin identifying method used to identify such bicolor coins.

A coin identification sensor that outputs a detection signal capable of identifying bicolor coins having different materials on the central side and the outer peripheral side is known. For example, Patent Document 1 describes a transport passage for transporting coins one by one at intervals, a reflective magnetic sensor arranged facing the coin sliding surface of the transport passage, and a transport passage. The first transmissive sensor arranged so as to sandwich one end of the transport passage, and the other end of the transport passage at a position facing the first transmissive sensor across the transport passage. A mutual guidance type material sensor that detects the material of the coin by a mutual guidance method, and a mutual guidance type material sensor that is composed of a second transmission type sensor, and a resonance method at a position downstream of the transport passage from the mutual guidance type material sensor. The resonance type material thickness sensor that detects the thickness of the coin and the material of the coin are detected by the resonance method separately from the mutual induction type material sensor at the position downstream of the mutual induction type material sensor in the transport passage. A coin identification device including a resonance type material sensor is disclosed.

Japanese Patent No. 5336900

However, in the coin identification device of Patent Document 1, not only the number of coils is large, but also the circuit configuration is complicated, and there is room for improvement in reducing the number of parts and simplifying the structure. For example, the coin identification device of Patent Document 1 includes a mutual induction type sensor that requires an exciting coil and a detection coil (secondary coil), and therefore has a large number of coils. Further, since the coin identification device of Patent Document 1 uses two types of excitation frequencies in order to increase the number of coin identification elements (separation elements), a circuit for synthesizing or separating the two types of excitation frequencies is required. The circuit configuration becomes complicated.

The invention, yet in which the material of the center of the material and the outer side output different bicolor coins can identify the detection signal, the coin identification sensor及beauty simplification reduced and the circuit configuration of the coils can be reduced The purpose is to provide a coin identification method.

The present invention has been created for the purpose of solving these problems in view of the above circumstances, and the invention of claim 1 is a bicolor coin in which the material on the central side and the material on the outer peripheral side are different. A coin identification sensor that outputs an identifiable detection signal.
It is arranged so as to face each other across the coin passage through which the coin passes, and while generating magnetic flux that penetrates the outer peripheral side of the coin in the thickness direction at both ends in the radial direction of the coin, the material and diameter of the outer peripheral side of the coin A penetrating magnetic sensor that detects the resulting change in magnetic flux and a penetrating magnetic sensor are arranged so as to face the center side of the coin passing through the coin passage, and while generating a magnetic flux that does not penetrate the center side of the coin in the thickness direction, the coin The first non-penetrating magnetic sensor that detects the change in magnetic flux due to the material on the center side is arranged so as to face the non-penetrating magnetic sensor across the coin passage, and the center side of the coin is oriented in the thickness direction. A second non-penetrating magnetic sensor that detects a change in magnetic flux due to the material on the center side of the coin while generating a magnetic flux that does not penetrate, and a penetrating magnetic sensor that is wound around the coil and is also used as an exciting coil and a detection coil. A first coil, a first resonance circuit configured by connecting a capacitor to the first coil, and a second coil wound around the non-penetrating magnetic sensor and also used as an exciting coil and a detection coil. A second resonance circuit configured by connecting a capacitor to the second coil, a third coil wound around the second non-penetrating magnetic sensor and also used as an exciting coil and a detection coil, and the third coil. A third resonance circuit configured by connecting a coil to the coil, a first amplitude detecting means for detecting the amplitude of the vibration attenuation wave output from the first resonance circuit according to the oscillation induction wave, and an oscillation induction wave. The first phase detecting means for detecting the phase of the vibration damping wave output from the first resonance circuit, and the second phase detecting means for detecting the amplitude of the vibration damping wave output from the second resonance circuit according to the oscillation induction wave. The amplitude detecting means, the second phase detecting means for detecting the phase of the vibration attenuation wave output from the second resonance circuit according to the oscillation induction wave, and the third resonance circuit output according to the oscillation induction wave. A third amplitude detecting means for detecting the amplitude of the vibration decay wave, a third phase detecting means for detecting the phase of the vibration decay wave output from the third resonance circuit according to the oscillation induction wave, and each time a coin passes. A detection signal that outputs detection signals of the first amplitude detecting means, the first phase detecting means, the second amplitude detecting means, the second phase detecting means, the third amplitude detecting means, and the third phase detecting means. It is provided with an output means .
Further, the invention of claim 2 is the coin identification sensor according to claim 1 , wherein at least one of the core around which the second coil is wound and the core around which the third coil is wound is. The first coil is integrated with the wound core.
Further, the invention of claim 3 comprises an outer peripheral magnetic sensor that detects a change in magnetic flux due to the material on the outer peripheral side of the coin, and a central magnetic sensor that detects a change in magnetic flux due to the material on the central side of the coin. The first coil wound around the outer peripheral magnetic sensor and also used as the exciting coil and the detection coil, the first resonant circuit formed by connecting a capacitor to the first coil, and the central magnetic sensor. A second coil that is wound and is also used as an excitation coil and a detection coil, a second resonance circuit that is configured by connecting a capacitor to the second coil, and an output from the first resonance circuit according to the oscillation induction wave. A first amplitude detecting means for detecting the amplitude of the vibration damping wave to be generated, a first phase detecting means for detecting the phase of the vibration damping wave output from the first resonance circuit according to the oscillation induction wave, and an oscillation induction wave. The second amplitude detecting means for detecting the amplitude of the vibration attenuation wave output from the second resonance circuit according to the above, and the phase of the vibration attenuation wave output from the second resonance circuit according to the oscillation induction wave are detected. A coin identification method for identifying bicolor coins in which the material on the center side and the material on the outer periphery are different from each other based on the detection signal of the coin identification sensor including the second phase detecting means, wherein the first amplitude detecting means is provided. The first ratio value calculation step for calculating the first ratio value, which is the ratio between the detected value of the first phase detecting means and the detected value of the first phase detecting means, the detection value of the second amplitude detecting means, and the second phase detecting means. Whether or not it is a bicolor coin based on the second ratio value calculation step for calculating the second ratio value, which is the ratio to the detected value, and the correlation between the first ratio value and the second ratio value. It comprises a bicolor coin identification step for identifying.

According to the invention of claim 1, the first coil wound around the penetrating magnetic sensor and the second coil wound around the first non-penetrating magnetic sensor are also used as an exciting coil and a detection coil, respectively. Therefore, the number of coils can be reduced. In addition, a capacitor is connected to each coil to form a plurality of resonant circuits, and the amplitude and phase of the vibration decay wave output from each resonant circuit are detected according to the pulse drive of the resonant circuit, so that the circuit configuration is complicated. It is possible to increase the identification element (type of detection signal) of the coin without doing so. Further, it is arranged so as to face the first non-penetrating magnetic sensor across the coin passage, and while generating a magnetic flux that does not penetrate the center side of the coin in the thickness direction, the change in magnetic flux due to the material on the center side of the coin. Since it is equipped with a second non-penetrating magnetic sensor that detects, even in a situation where coins float with respect to the non-penetrating magnetic sensor, it can be used as a detection signal for the first non-penetrating magnetic sensor and the second non-penetrating magnetic sensor. Based on this, the error due to the floating of the coin can be corrected, and the material on the center side of the coin can be accurately identified.
Further, according to the invention of claim 2 , at least one of the core on which the second coil is wound and the core on which the third coil is wound is integrated with the core on which the first coil is wound. Therefore, the parameters related to the penetrating magnetic sensor and the non-penetrating magnetic sensor can be unified as much as possible, and the change in the magnetic characteristics caused by the detected coin can be detected with higher accuracy .
Further, according to the invention of claim 3, the first ratio value which is the ratio of the detection value of the first amplitude detection means and the detection value of the first phase detection means, the detection value of the second amplitude detection means and the second. Since it is identified whether or not it is a bicolor coin based on the correlation with the second ratio value, which is the ratio to the detection value of the phase detection means, various noise factors are eliminated to make the bicolor coin high. It can be identified with precision.

It is a main part perspective view of the coin identification sensor which concerns on embodiment of this invention. It is sectional drawing of the main part of the coin identification sensor which concerns on embodiment of this invention. It is a figure which shows the positional relationship with the coin of the coin identification sensor which concerns on embodiment of this invention. It is a block diagram which shows the circuit structure of the coin identification sensor which concerns on embodiment of this invention. It is a figure which shows the vibration damped wave output by the resonance circuit of the coin identification sensor which concerns on embodiment of this invention, and its amplitude change and phase change. It is a figure which shows the output waveform of the coin identification sensor which concerns on embodiment of this invention. It is a figure which shows the output waveform of the coin identification sensor which concerns on embodiment of this invention, (a) is a figure which shows the output waveform of the 1st phase detection means, (b) shows the output waveform of the 1st amplitude detection means. FIG. 3C is a diagram showing an output waveform of the second phase detecting means, and FIG. 3D is a diagram showing an output waveform of the second amplitude detecting means. It is a figure which shows the coin identification performance by the detection signal of the 1st phase detection means and 1st amplitude detection means of the coin identification sensor which concerns on embodiment of this invention. It is a figure which shows the coin identification performance by the detection signal of the 2nd phase detection means and 2nd amplitude detection means of the coin identification sensor which concerns on embodiment of this invention. It is a flowchart which shows the control procedure of the coin identification sensor which concerns on embodiment of this invention. It is a block diagram which shows the structure of the coin identification apparatus which concerns on embodiment of this invention. It is a main part perspective view which shows the sensor part of the coin identification apparatus which concerns on embodiment of this invention. It is sectional drawing of the main part which shows the sensor part of the coin identification apparatus which concerns on embodiment of this invention, (a) is the sectional view of the main part which shows the flow of the magnetic flux at the time of driving the 1st coil, (b) is the 2nd coil drive. It is sectional drawing of the main part which shows the flow of the magnetic flux at the time. It is a figure which shows the identification performance of the coin identification apparatus which concerns on embodiment of this invention. It is a flowchart which shows the processing step of the coin identification method which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a main part of a coin identification sensor according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part of a coin identification sensor according to an embodiment of the present invention, and FIG. It is a figure which shows the positional relationship with the coin of the coin identification sensor which concerns on embodiment of this invention.

The coin identification sensor 1 according to the embodiment of the present invention outputs a detection signal for identifying the coin 2. The coins 2 to be detected include ordinary coins (for example, 1-yen coins, 5-yen coins, 10-yen coins, 50-yen coins, 100-yen coins, old 500-yen coins, and new 500-yen coins) made of one type of metal. Coins) and bicolor coins with different materials on the center side and the outer circumference side are included. Furthermore, bicolor coins are manufactured by sandwiching a metal plate of a different material with a disk on the center side. Bicolor clad coins (for example, local autonomy 500 yen coins) are included.

To identify the bicolor coin, it is necessary to detect the material on the center side and the material on the outer circumference side of the coin 2 with separate magnetic sensors, and to identify the bicolor clad coin, the center of the coin 2 is used. It is necessary to use a non-penetrating magnetic sensor (reflection magnetic sensor) as a magnetic sensor that detects the material on the side. The non-penetrating magnetic sensor is a magnetic sensor that detects changes in magnetic flux due to the material of the coin while generating magnetic flux that does not penetrate the coin in the thickness direction, and is not affected by the metal plate sandwiched in a sandwich shape. , The material of the metal plate on the surface side can be detected.

As shown in FIGS. 1 to 3, the coin identification sensor 1 of the present embodiment is arranged so as to face each other with the coin passage through which the coin 2 passes, and the coins 2 are arranged at both ends in the radial direction of the coin 2. One of a penetrating magnetic sensor 3 that detects a change in magnetic flux due to the material and diameter of the outer peripheral side of the coin 2 while generating a magnetic flux penetrating the outer peripheral side in the thickness direction, and a coin 2 that passes through the coin passage. A first non-penetrating type that is arranged so as to face the center side of the surface and detects a change in magnetic flux due to the material on the center side of the coin 2 while generating a magnetic flux that does not penetrate the center side of the coin 2 in the thickness direction. The magnetic sensor 4 is arranged so as to face the center side of the other surface of the coin 2 passing through the coin passage, and while generating a magnetic flux that does not penetrate the center side of the coin 2 in the thickness direction, the center side of the coin 2 It includes a second non-penetrating magnetic sensor 5 that detects a change in magnetic flux due to the material.

The penetrating magnetic sensor 3 is a first coil that is wound around a pair of cores 6 and a pair of cores 6 that are arranged so as to face each other across a coin passage and are electrically connected in series. 7 and. When the first coil 7 is excited, as shown in FIG. 2, magnetic fluxes that penetrate the outer peripheral side of the coin 2 in the thickness direction are generated at both ends in the radial direction of the coin 2. According to the detection circuit 20 described later, the first coil 7 can also be used as an exciting coil and a detection coil, and it is possible to detect a change in magnetic flux due to the material and diameter of the outer peripheral side of the coin 2 with a few coils. Become.

The first non-penetrating magnetic sensor 4 has a square-shaped core 8 arranged so as to face the center side of one surface of the coin 2 passing through the coin passage, and a second coil wound around the core 8. 9 and. When the second coil 9 is excited, a magnetic flux that does not penetrate the center side of the coin 2 in the thickness direction is generated. According to the detection circuit 20 described later, the second coil 9 can be used as both the exciting coil and the detection coil, and the change in magnetic flux due to the material on the center side of the coin 2 can be detected by a few coils.

The second non-penetrating magnetic sensor 4 has a square-shaped core 10 arranged so as to face the center side of the other surface of the coin 2 passing through the coin passage, and a third coil wound around the core 10. 11 and. When the third coil 11 is excited, a magnetic flux that does not penetrate the center side of the coin 2 in the thickness direction is generated. According to the detection circuit 20 described later, the third coil 11 can be used as both the exciting coil and the detection coil, and the change in magnetic flux due to the material on the center side of the coin 2 can be detected by a few coils.

FIG. 4 is a block diagram showing a circuit configuration of the coin identification sensor according to the embodiment of the present invention, and FIG. 5 shows a vibration damped wave output by the resonance circuit of the coin identification sensor according to the embodiment of the present invention. , Is a diagram showing the amplitude change and the phase change.

As shown in FIG. 4, the detection circuit 20 of the coin identification sensor is configured by connecting the first resonance circuit 21 configured by connecting the capacitor C1 to the first coil 7 and the capacitor C2 connected to the second coil 9. It is output from the second resonant circuit 22 to be generated, the third resonant circuit 23 configured by connecting the capacitor C3 to the third coil 11, and the first resonant circuit 21 according to the oscillating induced wave (for example, pulse wave). The first amplitude detection unit 31 (first amplitude detecting means) for detecting the amplitude of the vibration damping wave and the first phase for detecting the phase of the vibration damping wave output from the first resonance circuit 21 according to the oscillation induction wave. The detection unit 41 (first phase detection means), the second amplitude detection unit 32 (second amplitude detection means) that detects the amplitude of the vibration decay wave output from the second resonance circuit 22 according to the oscillation induction wave, and From the second phase detection unit 42 (second phase detection means) that detects the phase of the vibration decay wave output from the second resonance circuit 22 according to the oscillation induction wave, and from the third resonance circuit 23 according to the oscillation induction wave. The third amplitude detection unit 33 (third amplitude detecting means) that detects the amplitude of the output vibration attenuation wave, and the third amplitude detection wave that detects the phase of the vibration attenuation wave output from the third resonance circuit 23 according to the oscillation induction wave. Control unit 50 (detection signal output means) that pulse-drives the three-phase detection unit 43 (third phase detection means) and each resonance circuit 21 to 23 and inputs a detection signal from each detection unit 31 to 33 and 41 to 43. And.

As shown in FIG. 5, the vibration damped waves output by the resonance circuits 21 to 23 change in amplitude and phase depending on the presence or absence of the coin 2, the difference in the material, the difference in the diameter dimension, and the like. Therefore, the three resonance circuits 21 The coin identification sensor 1 of the present embodiment constituting the to 23 can output six types of detection signals serving as identification elements. The coin identification sensor 1 of the present embodiment has a second non-penetrating magnetic sensor 1 in order to correct an error due to floating even if the coin 2 floats with respect to the first non-penetrating magnetic sensor 4. Although the sensor 5 is provided, if the coin 2 does not float with respect to the first non-penetrating magnetic sensor 4, the second non-penetrating magnetic sensor 5 is omitted and the coin 2 is identified by four types of detection signals. You may try to do it.

FIG. 6 is a diagram showing an output waveform of the coin identification sensor according to the embodiment of the present invention, and FIG. 7 is a diagram showing an output waveform of the coin identification sensor according to the embodiment of the present invention. ) Is a diagram showing the output waveform of the first phase detecting means, (b) is a diagram showing the output waveform of the first amplitude detecting means, (c) is a diagram showing the output waveform of the second phase detecting means, and (d) is a diagram showing the output waveform of the second phase detecting means. It is a figure which shows the output waveform of the 2nd amplitude detection means, and FIG. 8 shows the coin identification performance by the detection signal of the 1st phase detection means and the 1st amplitude detection means of the coin identification sensor which concerns on embodiment of this invention. FIG. 9 is a diagram showing the coin identification performance by the detection signals of the second phase detecting means and the second amplitude detecting means of the coin identification sensor according to the embodiment of the present invention.

6 and 7 show the front surface of the new 500-yen coin, the back surface of the new 500-yen coin, the front surface of the old 500-yen coin, the back surface of the old 500-yen coin, the front surface of the local autonomy 500-yen coin, and the local autonomy in order from the left side. The first phase detection signal ((a) in FIG. 7), the first amplitude detection signal ((b) in FIG. 7), and the second output from the coin identification sensor 1 when the back surface of a 500-yen coin is passed. The waveforms of the phase detection signal (FIG. 7 (c)) and the second amplitude detection signal (FIG. 7 (d)) are shown. According to these four types of output waveforms, as shown in FIGS. 8 and 9, various coins 2 including ordinary coins, bicolor coins and bicolor clad coins can be accurately identified (separated). It will be possible.

FIG. 10 is a flowchart showing a control procedure of the coin identification sensor according to the embodiment of the present invention.

As shown in FIG. 10, the control unit 50 measures the coils 7, 9 and 11 (phase detection and amplitude detection) after clearing the counter (S1) (S2), and then measures the measured values (N) this time. And the previous measured value (N-1) are compared (S3). When the control unit 50 determines that the current measured value (N) matches the previous measured value (N-1), the counter reaches the upper limit value (for example, 1000) after incrementing the counter (S4). Whether or not it is determined (S5). When the control unit 50 determines that the counter value has reached the upper limit, the control unit 50 stores the measured values (phase detection value and amplitude detection value) of the coils 7, 9 and 11 as reference values (measured values when the coin is not passed). Then (S6), after clearing the counter (S7), the output value is calculated (S8) and the calculated value is output (S9). That is, the reference values of the coils 7, 9 and 11 are updated every time the counter value reaches the upper limit.

On the other hand, when the control unit 50 determines in step S5 that the counter value has not reached the upper limit, the control unit 50 calculates the output value (S8) and outputs the calculated value (S9), and in step S3, this time. If it is determined that the measured value (N) of the above does not match the previous measured value (N-1), after clearing the counter (S7), the output value is calculated (S8) and the calculated value is output (S9). .. In step S8, the control unit 50 sets the measured values (phase detection value and amplitude detection value) of the coils 7, 9 and 11 and the reference values (phase reference value and amplitude reference value) of the coils 7, 9 and 11. After calculating the difference and outputting the calculated value (S9), the process returns to step S2 and a series of processes (S2 to S9) are repeated.

According to the present embodiment configured as described above, the coin identification sensor 1 outputs a detection signal capable of identifying bicolor coins having different materials on the central side and the outer peripheral side, through which the coin 2 passes. It is arranged so as to face each other across the coin passage, and is caused by the material and diameter of the outer peripheral side of the coin 2 while generating magnetic flux that penetrates the outer peripheral side of the coin 2 in the thickness direction at both ends in the radial direction of the coin 2. The penetrating magnetic sensor 3 for detecting the change in the magnetic flux is arranged so as to face the center side of the coin 2 passing through the coin passage, and the coin is generated while generating a magnetic flux that does not penetrate the center side of the coin 2 in the thickness direction. A first non-penetrating magnetic sensor 4 that detects a change in magnetic flux due to the material on the center side of 2, a first coil 7 that is wound around a penetrating magnetic sensor 3 and is also used as an exciting coil and a detection coil. A first resonance circuit 21 configured by connecting a capacitor C1 to a first coil 7, a second coil 9 wound around a first non-penetrating magnetic sensor 4 and also used as an exciting coil and a detection coil, and a second coil. A second resonance circuit 22 configured by connecting the capacitor C2 to the two coils 9 and a first amplitude detection unit 31 that detects the amplitude of the vibration decay wave output from the first resonance circuit 21 according to the oscillation induction wave. The first phase detection unit 41 that detects the phase of the vibration attenuation wave output from the first resonance circuit 21 according to the oscillation induction wave, and the vibration attenuation wave output from the second resonance circuit 22 according to the oscillation induction wave. The second amplitude detection unit 32 that detects the amplitude of the coil, the second phase detection unit 42 that detects the phase of the vibration decay wave output from the second resonance circuit 22 according to the oscillation induction wave, and each time the coin 2 passes. , A control unit 50 that outputs a first amplitude detection signal, a first phase detection signal, a second amplitude detection signal, and a second phase detection signal. Therefore, not only can the number of coils be reduced by combining the coils, but also The identification elements (types of detection signals) of the coin 2 can be increased without complicating the circuit configuration.

Further, the coin identification sensor 1 is arranged so as to face the first non-penetrating magnetic sensor 4 with the coin passage interposed therebetween, and while generating a magnetic flux that does not penetrate the center side of the coin 2 in the thickness direction, the coin 2 has a coin identification sensor 1. A second non-penetrating magnetic sensor 5 that detects a change in magnetic flux due to the material on the center side, and a third coil 11 that is wound around the second non-penetrating magnetic sensor 5 and is also used as an exciting coil and a detecting coil. , A third resonance circuit 23 configured by connecting a capacitor C3 to the third coil 11, and a third amplitude detection unit that detects the amplitude of the vibration attenuation wave output from the third resonance circuit 23 according to the oscillation induction wave. 33 is further provided with a third phase detection unit 43 for detecting the phase of the vibration decay wave output from the third resonance circuit 23 in response to the oscillation induction wave, and the control unit 50 is provided with each passage of the coin 2. Since the first amplitude detection signal, the first phase detection signal, the second amplitude detection signal, the second phase detection signal, the third amplitude detection signal, and the third phase detection signal are output, the first non-penetrating magnetic sensor 4 Even in a situation where the coin 2 is lifted, the error due to the lift of the coin 2 is corrected based on the detection signals of the first non-penetrating magnetic sensor 4 and the second non-penetrating magnetic sensor 5, and the center side of the coin 2 is corrected. The material of the coil can be identified accurately.

Further, since the control unit 50 outputs the difference between the detection signal when the coin is not passed and the detection signal when the coin is passed, it is possible to cancel the environmental error such as temperature drift and improve the identification accuracy of the coin 2. ..

Next, the coin identification device 100 according to the embodiment of the present invention will be described with reference to FIGS. 11 to 15.

As shown in FIG. 11, the coin identification device 100 includes a sensor unit 1B for detecting the magnetic characteristics of coins and an identification unit 101 for identifying bicolor coins based on the detection signal of the sensor unit 1B. .. The sensor unit 1B corresponds to the coin identification sensor 1 described above, and for the common configuration, the description of the coin identification sensor 1 is incorporated by using the same reference numerals as the coin identification sensor 1. Or, the illustration may be omitted.

The sensor unit 1B includes an outer peripheral magnetic sensor 3B that detects a change in magnetic flux due to the material on the outer peripheral side of the coin 2, and a central magnetic sensor 4B that detects a change in magnetic flux due to the material on the central side of the coin 2. The first coil 7B, which is wound around the outer peripheral side magnetic sensor 3B and is also used as the excitation coil and the detection coil, the first resonance circuit 21 configured by connecting the capacitor C1 to the first coil 7B, and the center side. A second coil 9B wound around a magnetic sensor 4 and also used as an exciting coil and a detection coil, a second resonant circuit 22 configured by connecting a capacitor C2 to the second coil 9B, and an oscillation induced wave. The first amplitude detection unit 31 that detects the amplitude of the vibration attenuation wave output from the first resonance circuit 21 and the first that detects the phase of the vibration attenuation wave output from the first resonance circuit 21 according to the oscillation induction wave. The phase detection unit 41, the second amplitude detection unit 32 that detects the amplitude of the vibration attenuation wave output from the second resonance circuit 22 according to the oscillation induction wave, and the output from the second resonance circuit 22 according to the oscillation induction wave. A second phase detection unit 42 for detecting the phase of the vibration damping wave to be generated is provided.

The identification unit 101 has a first ratio, which is a ratio between the detection value of the first amplitude detection unit 31 and the detection value of the first phase detection unit 41, as a functional configuration realized by the cooperation of hardware and software. It is the ratio between the first ratio value calculation means (first ratio value calculation step: step S1 in FIG. 15) for calculating the value, the detection value of the second amplitude detection unit 32, and the detection value of the second phase detection unit 34. Bicolor coins based on the correlation between the second ratio value calculation means (second ratio value calculation step: step S2 in FIG. 15) for calculating the second ratio value and the first ratio value and the second ratio value. A bicolor coin identification means (bicolor coin identification step: step S3 in FIG. 15) for identifying the presence or absence is provided.

According to such a coin identification device 100, the first ratio value, which is the ratio between the detection value of the first amplitude detection unit 31 and the detection value of the first phase detection unit 41, and the detection value of the second amplitude detection unit 32. Since it is identified whether or not it is a bicolor coin based on the correlation between the second ratio value, which is the ratio between the second phase detection unit 42 and the detected value of the second phase detection unit 42, various noise elements are eliminated to buy. Color coins can be identified with high accuracy.

More specifically with reference to FIG. 14, coins formed of a single alloy (for example, 1-yen coin, 5-yen coin, 10-yen coin, 50-yen coin, 100-yen coin, old 500-yen coin, new 500-yen coin) In the case of coins), the first ratio value and the second ratio value show a correlation that approximates a predetermined linear function, and bicolor coins (for example, local autonomy 500 yen) in which the material on the center side and the material on the outer circumference side are different. In the case of coins), the correlation between the first ratio value and the second ratio value deviates from a predetermined linear function. Therefore, if the correlation between the first ratio value and the second ratio value does not approximate a predetermined linear function, it can be determined that the coin is a bicolor coin.
For example, assuming that the first ratio value is x, the second ratio value is y, and the constants are a and b, in the case of a coin formed of a single alloy, it approximates the following linear function.
y = ax + b
Here, assuming that the approximate threshold value for discriminating between the single alloy coin and the bicolor coin is k, it is possible to discriminate the bicolor coin based on whether or not the following equation holds.
| Y-ax-b |> k

Further, as shown in FIGS. 12 and 13, in the sensor unit 1B, the core 8B around which the second coil 9B is wound is integrated with the core 6B around which the first coil 7B is wound. By doing so, the parameters related to the outer peripheral side magnetic sensor 3B and the central side magnetic sensor 4B can be unified as much as possible, and the change in the magnetic characteristics due to the coin 2 to be detected can be detected with higher accuracy. .. In addition, the integration includes not only the case of integrally molding but also the case of integrally joining a plurality of separately formed members and the case of integrally laminating them.

Specifically, the outer peripheral side magnetic sensor 3B includes a pair of cores 61 and 62 facing each other across the coin passage, and one core 61 includes a base portion 61a around which the first coil 7B is wound. A pair of outer peripheral side protruding portions 61b that project from both ends of the base portion 61a toward the coin passage side and are close to the outer peripheral side of the coin 2 are integrally provided. Further, the other core 62 includes a base portion 62a around which the first coil 7B is wound, and a pair of outer peripheral side protruding portions 62b protruding from both ends of the base portion 62a toward the coin passage side and close to the outer peripheral side of the coin 2. A central protruding portion 62c that protrudes from the middle portion of the base portion 62a toward the coin passage side and is close to the central side of the coin 2 is integrally provided, and a second coil 9B is wound around the central protruding portion 62c. ..

As shown in FIG. 13A, when the first coil 7B is excited, a magnetic flux penetrating the outer peripheral side of the coin 2 in the thickness direction is generated between the outer peripheral side protrusions 61b and 62b of the pair of cores 61 and 62. However, it becomes possible to detect a change in magnetic flux due to the material and diameter of the outer peripheral side of the coin 2. Further, as shown in FIG. 13B, when the second coil 9B is excited, the central side of the coin 2 is penetrated in the thickness direction between the central side protruding portion 62c and the outer peripheral side protruding portion 62b of the core 62. A magnetic flux that does not occur is generated, and it becomes possible to detect a change in magnetic flux due to the material on the center side of the coin 2.

1 Coin identification sensor 2 Coin 3 Penetration type magnetic sensor 4 First non-penetration type magnetic sensor 5 Second non-penetration type magnetic sensor 7 First coil 9 Second coil 11 Third coil 20 Detection circuit 21 First resonance circuit 22 First 2 Resonant circuit 23 3rd resonance circuit 31 1st amplitude detection unit 32 2nd amplitude detection unit 33 3rd amplitude detection unit 41 1st phase detection unit 42 2nd phase detection unit 43 3rd phase detection unit 50 Control units C1 to C3 Capacitor 100 Coin identification device 1B Sensor unit 101 Identification unit 7B 1st coil 9B 2nd coil

Claims (3)

A coin identification sensor that outputs a detection signal that can identify bicolor coins whose center side material and outer circumference side material are different.
Arranged so as to face each other across the coin passage through which the coin passes, the material and diameter of the outer peripheral side of the coin are adjusted while generating magnetic flux that penetrates the outer peripheral side of the coin in the thickness direction at both ends in the radial direction of the coin. A penetrating magnetic sensor that detects changes in magnetic flux caused by
The first is arranged so as to face the center side of the coin passing through the coin passage, and while generating a magnetic flux that does not penetrate the center side of the coin in the thickness direction, a change in the magnetic flux due to the material on the center side of the coin is detected . 1 Non-penetrating magnetic sensor and
Arranged so as to face the non-penetrating magnetic sensor across the coin passage, it detects a change in magnetic flux due to the material on the center side of the coin while generating a magnetic flux that does not penetrate the center side of the coin in the thickness direction. The second non-penetrating magnetic sensor
A first coil wound around the penetrating magnetic sensor and also used as an exciting coil and a detection coil.
A first resonant circuit configured by connecting a capacitor to the first coil,
A second coil wound around the non-penetrating magnetic sensor and also used as an exciting coil and a detection coil.
A second resonant circuit configured by connecting a capacitor to the second coil,
A third coil wound around the second non-penetrating magnetic sensor and also used as an exciting coil and a detection coil.
A third resonant circuit configured by connecting a capacitor to the third coil,
A first amplitude detecting means for detecting the amplitude of the vibration damped wave output from the first resonance circuit according to the oscillation induction wave, and
A first phase detecting means for detecting the phase of the vibration damped wave output from the first resonance circuit according to the oscillation induction wave, and
A second amplitude detecting means for detecting the amplitude of the vibration damped wave output from the second resonance circuit according to the oscillation induction wave, and
A second phase detection means for detecting the phase of the vibration damped wave output from the second resonance circuit according to the oscillation induction wave, and
A third amplitude detecting means for detecting the amplitude of the vibration damped wave output from the third resonance circuit according to the oscillation induction wave, and
A third phase detection means for detecting the phase of the vibration damped wave output from the third resonance circuit according to the oscillation induction wave, and
Each time a coin passes, the detection signals of the first amplitude detecting means, the first phase detecting means, the second amplitude detecting means, the second phase detecting means, the third amplitude detecting means, and the third phase detecting means. A sensor for coin identification , which comprises a detection signal output means for outputting . The first aspect of claim 1, wherein at least one of the core around which the second coil is wound and the core around which the third coil is wound is integrated with the core around which the first coil is wound. Coin identification sensor. A magnetic sensor on the outer circumference that detects changes in magnetic flux due to the material on the outer circumference of the coin,
A central magnetic sensor that detects changes in magnetic flux due to the material on the center of the coin,
A first coil wound around the outer peripheral magnetic sensor and also used as an exciting coil and a detection coil.
A first resonant circuit configured by connecting a capacitor to the first coil,
A second coil wound around the central magnetic sensor and also used as an exciting coil and a detection coil.
A second resonant circuit configured by connecting a capacitor to the second coil,
A first amplitude detecting means for detecting the amplitude of the vibration damped wave output from the first resonance circuit according to the oscillation induction wave, and
A first phase detecting means for detecting the phase of the vibration damped wave output from the first resonance circuit according to the oscillation induction wave, and
A second amplitude detecting means for detecting the amplitude of the vibration damped wave output from the second resonance circuit according to the oscillation induction wave, and
Based on the detection signal of the coin identification sensor including the second phase detection means for detecting the phase of the vibration damped wave output from the second resonance circuit according to the oscillation induction wave, the material on the center side and the outer circumference side. It is a coin identification method that identifies bicolor coins made of different materials.
A first ratio value calculation step for calculating a first ratio value, which is a ratio between the detection value of the first amplitude detection means and the detection value of the first phase detection means, and
A second ratio value calculation step for calculating a second ratio value, which is a ratio between the detection value of the second amplitude detection means and the detection value of the second phase detection means, and
A coin identification method comprising a bicolor coin identification step for identifying whether or not a coin is a bicolor coin based on the correlation between the first ratio value and the second ratio value.