KR20000076308A - Method and apparatus for discriminating true/false of coin - Google Patents

Abstract

Method and apparatus for discriminating the true eye of a coin by the difference of irregularities of coin surface. An excitation coil is arranged in the vicinity of a passage wall on one side of the coin passage so that two magnetic poles of the coin passage and the excitation coil inclined at a predetermined angle are directed toward the coin passage. Two receiving coils having substantially the same characteristics are arranged in the vicinity of the same passage wall by electronic coupling with the excitation coil. The excitation coil is excited at a predetermined frequency, and the reception coil detects the influence of the semi-magnetic field caused by the eddy current generated on the surface of the coin. The degree of the diamagnetic field is different depending on the unevenness of the surface of the coin, and the coin can be identified by the difference of the unevenness. The configuration is simple and inexpensive. Coins that are almost identical in material, appearance, and thickness can be identified by the difference in their surface shape.

Description

METHOD AND APPARATUS FOR DISCRIMINATING TRUE / FALSE OF COIN}

Recently, the coin identification device is an electronic mainstream using an induction coil. This type of coin discriminating device generally uses falling of the coin by its own weight, and a passage for guiding the coin introduced from the coin inlet is provided. Several sets of induction coils are arranged in this passage, and each of the sets of induction coils is provided with an electromagnetic field excited by different frequencies.

The coin test detects the coin's seriousness by detecting the amount of electrical change (frequency change, voltage change, phase change) obtained by the interaction between the field and the coin when the coin passes through the field.

In the coin inspection apparatus of the prior art, since the characteristics of the coin are often shown with respect to the frequency dependent parameter, the material, outer diameter, thickness, etc. of the coin can be obtained by using several frequencies as disclosed in US Patent No. 3,870,137. It has been used as a technique for inspecting.

In recent years, due to borderless payment, coins of other countries can be easily brought in, and the cases in which these coins are used for fraudulent acts by people who mistakenly or cheat are increasing. Among the coins of each country, materials, outer diameters, thicknesses, and the like are approximated. For example, 5 cents (CENT) in the US and 5 centesi (CENTESIMOS) in the Panama are one example. These coins have almost the same design, irregularities, and materials, outer diameters, and thicknesses. In the configuration of the induction coil as in the prior art, a minute change cannot be detected only by using a plurality of frequencies in the uneven shape of the surface of the coin, and as a result, the coin as described above cannot be discriminated.

In addition, Japan's 500 yen cure and Korea's 500 won cure are almost the same in material and outer diameter, and the thickness of the 500 yen cure is slightly thicker. Therefore, when processing this 500-won hardening and using it as a 500-yen hardening, in the method of checking coin eye stability according to the thickness, appearance, and material of a conventional coin, this processed 500-won hardening and 500 yen hardening are distinguished. It was difficult.

Moreover, in the prior art, an optical method such as image processing has been attempted as a means for discriminating such coins. However, there is a problem that the optical device is attached to dust or the like to damage the authenticity of the coin, and the device is not only large but also complicated, resulting in a high price.

The present invention relates to a method and apparatus for determining the true eye (whether genuine or fake) by identifying coins, and more particularly, to a method and apparatus for determining the true eye of a coin used in a vending machine, a game machine, or the like. will be.

Fig. 1A is a front view showing the structure of a detection coil for detecting the uneven shape of the coin surface in the first embodiment of the present invention, Fig. 1B is a sectional view thereof;

2 is a block diagram showing a circuit configuration in the embodiment of the present invention;

3 is a concrete diagram of a circuit in the same embodiment;

4 is a front view showing an apparatus for inspecting the true eye of a coin in one embodiment of the present invention;

FIG. 5A is a front view illustrating the configuration of the coil in detail in the embodiment of the present invention, FIG. 5B is a sectional view thereof;

6 is a characteristic diagram showing the characteristics of the representative coin in the embodiment of the present invention;

7 is a contrast diagram showing the specifications of the representative coin in the embodiment of the present invention;

8 is a flowchart of the operation in the embodiment of the present invention;

Fig. 9A is a front view showing the structure of the detection coil for detecting the unevenness in the second embodiment of the present invention, Fig. 9B is a sectional view thereof;

Fig. 10A is a front view showing the structure of the detection coil for detecting the unevenness in the third embodiment of the present invention, Fig. 10B is a sectional view thereof;

Fig. 11A is a front view showing the structure of the detection coil for detecting the unevenness in the fourth embodiment of the present invention, and Fig. 11B is a sectional view thereof;

Fig. 12 is an explanatory diagram showing an example in which a portion of the coin passage wall in which the receiving coils are disposed in each embodiment of the present invention is made of a material having high permeability.

Disclosure of the Invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for discriminating coins' true eyesight that can accurately identify coins.

The method of discriminating the true eye of a coin according to the present invention is a step of arranging an electronic coil and a receiving coil to be coupled to each other in the vicinity of a coin passage, and the effect of a diamagnetic field caused by the eddy current generated on the surface of the coin when the coin passes through the electromagnetic field. The excitation coil is excited at the frequency detected by the receiving coil to generate an electromagnetic field, and the coin is detected according to the electromotive force signal detected by the receiving coil and the step of detecting the electromagnetic field affected by the semi-magnetic field as the electromotive signal by the receiving coil. A step of identifying is provided.

Since the coin surface passing through the coin passage and the receiving coil may be closer to each other, the coin passage is formed so that the coin is inclined (hardness) on one side of the coin passage in which the excitation coil and the receiving coil are arranged. Also, depending on the material, penetration of the electromagnetic field into the coin varies with the excitation frequency. For this reason, there is an excitation frequency in which the difference in irregularities on the coin surface appears well as the difference in the signal from the receiving coil, depending on the material of the coin to be detected and identified. Therefore, the frequency of exciting the excitation coil is selected and set according to the material of the coin to be identified.

Specifically, a female coil disposed near one side of the coin passage so that the stimulus is directed to the coin passage inclined at a predetermined angle, and two receiving coils having substantially the same characteristics disposed near the coin passage so as to be electronically coupled to the female coil, An excitation means for exciting the excitation coil at a predetermined frequency to generate an electromagnetic field, a bridge circuit means including a receiving coil, a differential amplification means connected to the bridge circuit means, a detection means connected to the differential amplification means, a detection means connected to the detection means, and The trueness of the coin by means of identification means which compares the signal obtained when the coin passes with the characteristic of a predetermined coin type stored in advance and determines the coin as authentic when the signal is within a predetermined allowable range for the characteristic. Run the determination.

Best Mode for Carrying Out the Invention

An embodiment of the present invention will be described with reference to FIGS. 1A, 1B and 2.

As shown in Figs. 1A and 1B, the detector for identifying the coin 3 is composed of one excitation coil 1 and two receiving coils 2a and 2b. It is arrange | positioned so that it may contact the side passage wall 7a. The coin passage 6 is inclined at a predetermined angle to guide and drop the coin 3, and is composed of a coin rail 4 arranged at the bottom and a pair of passage walls 7a and 7b. The passage walls 7a and 7b are arranged inclined with respect to the vertical direction so that the coin 3 inclines and falls to the side of the passage wall 7a as shown in FIG. 1B. Moreover, it is set as the structure which inclines in the inclination direction of passage walls 7a and 7b so that the coin 3 which also passes the surface of the coin rail 4 which mounts and guides a coin may incline to the passage wall 7a side. .

Each of the two receiving coils 2a and 2b is composed of a drum-shaped core 43 and a coil 44 wound around the core 43 as shown in Fig. 5B. As shown in Fig. 1A, the receiving coils 2a and 2b are above the coin rails 4, and a line 5a connecting the centers of the coils 2a and 2b is connected to the coin rails 4, respectively. It is arrange | positioned at predetermined intervals so that it may become substantially parallel.

The excitation coil 1 is composed of a U-shaped core 40 made of a magnetic material and a coil 41 wound around the core 40 as shown in FIG. 5A. As shown in FIG. 1A, the excitation coil 1 has a center C3 of the core 40 above the receiving coils 2a and 2b, and a center C1 of the receiving coil 2a and a center C2 of the receiving coil 2b. The line 5b connecting the center of the quantum pole surface 40a is on the line 5c passing through the middle point M of the line segments C1 and C2 perpendicular to the line 5a connecting the It is arrange | positioned so that it may become substantially parallel. Moreover, as shown in FIG. 1B, the magnetic pole surface 40a of the core 40 is arrange | positioned so that it may become parallel to the surface of the coin 3 which passes. In addition, (42) in FIG. 5A and (45) in FIG. 5B represent a lead line.

The excitation coil 1 and the reception coils 2a and 2b arranged as described above are electronically coupled by an electromagnetic field generated by the excitation of the excitation coil 1.

In Fig. 2, the oscillation circuit 11 outputs a square wave signal of a predetermined frequency generated by, for example, an MPU (microprocessor unit) or the like as an output terminal. The output of the oscillation circuit 11 is connected to the excitation drive circuit 12, and the output of the excitation drive circuit 12 is connected to the excitation coil 1 to excite and drive the excitation coil 1. As a result, the excitation coil 1 generates an electromagnetic field around the excitation coil 1 in accordance with the output signal of the excitation drive circuit 12.

On the other hand, the two receiving coils 2a and 2b generate an electromotive force according to the strength of the electromagnetic field generated by the excitation coil 1. As described above, the excitation coil 1, the receiving coils 2a, and 2b are preferably arranged so as to approach the surface of the coin 3 and inspected.

When the coin 3 acts in the electromagnetic field, an eddy current is generated near the surface of the coin 3 excited by the excitation coil 1, and the eddy current is remarkable in the vicinity of the outer circumference of the coin due to the skin effect as the operating frequency increases. Generate a diamagnetic field. The semi-magnetic current generated near the surface of the coin outer circumference due to the above phenomenon interacts with the receiving coils 2a and 2b with a slight change in the shape of the coin surface. Receiving coils 2a and 2b generate an electromotive force according to the change of the diamagnetic field current caused by (induced) a change in the shape characteristic of the coin 3. Hereinafter, the signal generated by this electromotive force is called a "detection signal."

In addition, since the magnetic poles of the excitation coil 1 are arranged near the receiving coils 2a and 2b, the change in the anti-magnetic current caused by the electromagnetic field generated by the magnetic poles acting on the coin 3 in the vicinity is very near. Can be captured.

The semi-magnetic current due to the skin effect is remarkable in the vicinity of the coin outer periphery, but when the unevenness of the coin surface is remarkable, the change is not particularly limited to the vicinity of the coin outer periphery. The detection signals of the reception coils 2a and 2b generate an AC voltage signal corresponding to the detection signal by the bridge circuit 13 configured to include the reception coils 2a and 2b, and the differential amplifier 14 Is output. The differential amplifier 14 amplifies the AC voltage signal generated by the bridge circuit 13 and outputs it to the detection circuit 15. The detection circuit 15 inputs an AC voltage signal amplified by the differential amplifier 14 and outputs a DC voltage signal corresponding to the detection signal to the determination circuit 16. The discrimination circuit 16 inputs a DC voltage signal into the AD converter 17 inside thereof, converts it into a digital signal of a corresponding voltage, and outputs it to the signal inspection circuit 18 included inside the discrimination circuit 16. . The signal inspection circuit 18 checks whether the coin 3 has a predetermined characteristic and outputs the inspection result to the output terminal 19. The output of the signal inspection circuit 18 is used to drive a distribution solenoid or a coin counter (not shown) which will be described later.

3 is a detailed view illustrating the block circuit of FIG. 2 in detail. 4 is a front view showing a coin inspection device using a detection coil for detecting the unevenness. FIG. 5A is a front view illustrating the configuration of the coil in detail, and FIG. 5B is a sectional view thereof.

Referring to Fig. 3 to Fig. 2, the circuit configuration will be described in detail. The oscillation circuit 11 is configured using a dispensing means or the like connected by distributing an internal reference clock using the MPU 20. do. The excitation coil 1 is configured so that resonance occurs near the set predetermined frequency output from the oscillation circuit 11 so as to be connected in parallel with the capacitor C1 to form an LC parallel resonance circuit.

The excitation drive circuit 12 is constituted by a transistor TR1 and resistors R3 and R4 connected for switching operation, and a resistor R5, a capacitor C4, and a resistor R6 for turning the square wave output from the oscillation circuit 11 into a waveform approximating a triangular wave. It consists of a drive circuit which consists of a transistor TR2 and the resistor R7 connected to the exciting coil 1 which forms an integral circuit and an LC parallel resonant circuit.

The bridge circuit 13 is composed of a capacitor C2 connected in parallel with the receiving coil 2a, a capacitor C3 connected in parallel with the receiving coil 2b, and resistors R1 and R2.

The differential amplifier 14 is connected to the output of the bridge circuit 13 by AC coupling capacitors C5 and C6, the operational amplifier A1, the operational amplifier connected to determine the gain of the operational amplifier R8, R10 and R9, R11 It consists of.

The detection circuit 15 is constituted by a rectifying circuit (double voltage rectifying circuit) of diodes D1 and D2 connected to the coupling capacitor C7 connected to the output of the differential amplifier 14 and an integrating circuit by resistors R12 and capacitor C8. It is.

The AD converter 17 and the signal inspection circuit 18 of the discrimination circuit 16 are configured using the MPU 20 (microprocessor unit).

The oscillation circuit 11 outputs a square wave signal of a predetermined frequency, the frequency of which penetrates the coin surface of the coin to the center of the coin to detect the difference in the irregularities of the coin 3 with sensitivity. The frequency which does not penetrate and shows the influence of the diamagnetic field by eddy current remarkably is preferable. This frequency varies depending on the material of the coin to be discriminated, and when the above-mentioned 5 cents of US and 5 centimess of Panama are identified, these hardened materials are copper, and if the coin is copper, the female coil. The excitation frequency of (1) is preferably 70 K (Hz) to 90 K (Hz), and in the experiment according to the present invention described later, the frequency was set to 90 K (Hz).

The frequency of excitation of the excitation coil 1 is determined by the material of the target coin, and is detected by the receiving coils 2a and 2b by sequentially changing the excitation frequency for the coin of the same appearance and changing only the thickness. Measure the voltage and calculate the frequency with large change of detection voltage according to the change of coin thickness.

For example, in the case of cupronickel, it has been found by experiment that the excitation frequency of 70 K (Hz) to 90 K (Hz) changes the detection voltage the most with the change of thickness. At frequencies higher or lower than 70 K (Hz) to 90 K (Hz), as the distance from this frequency band increases, the change in detection voltage with respect to the change in the thickness of the coin gradually decreases, and the difference in thickness, that is, the unevenness of the coin surface In order to identify coins by the difference, the excitation frequency of the above-mentioned 70K (Hz)-90K (Hz) is suitable for a cupronickel coin.

For example, when the material of the target coin is brass, the excitation frequency of about 7K (Hz) to 10K (Hz) has a large change in the output voltage due to the change in the thickness of the coin. Therefore, in order to identify coins formed of brass in the form of irregularities on the surface, it is possible to identify coins efficiently by using an excitation frequency of 7 K (Hz) to 10 K (Hz).

The excitation drive circuit 12 inputs a square wave signal output from the oscillation circuit 11, converts the square wave into a waveform approximating to a triangular wave by integrating the square wave by an integration circuit composed of a resistor R5, a capacitor C4, and a resistor R6. The excitation coil 1 is driven by the triangle wave signal. The LC resonant circuit composed of the excitation coil 1 and the capacitor C1 resonates at the frequency and both ends of the excitation coil 1 are driven in a sinusoidal waveform as a result.

The bridge circuit 13 having the above-described configuration constitutes an AC bridge circuit, in which the impedance formed by the capacitor C2 connected in parallel with the receiving coil 2a is connected by the capacitor C3 connected in parallel with the receiving coil 2b. If the impedance to be formed is Z2, the resistance of the resistor R1 is Z3 and the impedance of the resistor R2 is Z4, then the AC bridge will be in equilibrium.

Z1, Z4 = Z2, Z3

Becomes

Here, as shown in Fig. 3, the output of the bridge circuit 13 is a signal that appears between the connection points of the reception coils 2a and 2b and the connection points of the connection points of the resistors R1 and R2. If the voltage at both ends of 2a) is V1 and the current flowing through the impedance Z1 is i1, and the voltage at both ends of the receiving coil 2b is V2 and the current flowing at the impedance Z2 is i2, the voltage Vdef of the signal appearing between the connection points is It is as follows (provided that impedance Z3 of resistor R1 and impedance Z4 of resistor R2 are the same).

V1 = Z1, i1

V2 = Z2, i2

Vdef = V1-V2

Vdef = Z1, i1-Z2, i2

In this embodiment, the resonant frequency of the LC resonant circuit by the receiving coil 2a and the capacitor C2 and the resonant frequency of the LC resonant circuit by the receiving coil 2b and the capacitor C3 are different from the oscillation frequency output by the oscillating circuit 11. Since the impedances Z1 and Z2 are approximately the same, the voltage of the signal appearing between the connection points becomes a voltage signal caused by the difference between the currents i1 and i2.

The differential amplifier 14 receives a signal of an AC voltage from the bridge circuit 13, amplifies it into a desired AC voltage signal, and outputs it to the detection circuit 15.

The detection circuit 15 inputs an AC voltage signal output from the differential amplifier 14, performs detection rectification by the diode D1, and outputs the bridge circuit 13 by an integrating circuit composed of a resistor R12 and a capacitor C8. Convert to a DC voltage signal corresponding to.

The AD converter 17 is realized by using, for example, an AD converter of a sequential comparison conversion type having 8 bits of resolution built in the MPU 20. The AD converter 17 inputs an analog DC voltage signal output from the detection circuit 15, performs sampling at predetermined intervals, converts it into a digital signal corresponding to the output of the bridge circuit 13, and converts the digital signal sequence. Output to the signal inspection circuit 18.

The signal inspection circuit 18 inputs the digital signal string on the amplitude axis output from the AD converter 17, temporarily stores this in a memory such as RAM, and retains it. Obtains a statistical value of the data type for each coin type stored and held in the above), and checks whether the statistical value has a predetermined characteristic compared with a predetermined value stored and held in the memory 21 in advance. The test result is output to the output terminal 19.

As a specific method of calculating the statistical value, the following equation for calculating the correlation coefficient can be used.

In Equation 1, N is the sampling number, variable Xi is a sampling value, the value of the digital signal string obtained by measuring the detected coin, and variable Yi is a statistical value obtained by pre-sampling and measuring the coin type that can be stored using the apparatus of the present invention. Value. In addition, Xa and Ya are each average value.

In consideration of the processing speed of the MPU, the sampling value Yi for each acceptable coin type in the variation cross product of the molecules in Equation 1, the deviation value Yi-Ya of its average value Ya, and the sampling value Yi of the denominator of Equation 1 and its By calculating the square root of the square (square) sum of the deviation of the average value Ya in advance and storing the value in the memory 21, the post-processing speed can be made very high.

Here, since the absolute value of the correlation coefficient r obtained by Equation 1 is in the range of 0≤ | r | ≤1 as is well known, the detected coin is compared by comparing this correlation coefficient r with a predetermined value stored in advance. It is possible to check whether or not the device has a predetermined feature, and when the coefficient r is close to " 1 ", the detected coin can determine that the coin according to the coin type that can be stored is genuine. However, as a result of the inspection, when the coefficient is near zero, it can be determined that the coin is fake. Therefore, a value close to 1 of 1 or less is set in accordance with the target coin to be determined to determine the predetermined value for authenticity discrimination, and when a correlation coefficient r larger than the set value is obtained, the coin is purified. do.

Here, the characteristic of the representative coin measured by the apparatus of this invention is demonstrated using FIG. 6 and FIG. 6 is a diagram illustrating the characteristics of a representative coin. 7 is a contrast diagram showing the specifications of representative coins. In FIG. 7, the US 5 cents of the representative coin and the 5 centimeters of the Panamanian state are coins with approximate material (copper), diameter, and thickness. At first glance, the only difference between the two coins is the design of the coin surface.

Fig. 6 is a characteristic diagram showing the results of measuring the coin by exciting the excitation coil 1 with an excitation frequency of 90 K (Hz) using the apparatus according to the present invention. In Fig. 6, (50) (indicated by a bold line) represents the US 5 cents, and (51) represents the 5 centimeters of Panama. In FIG. 6, the difference in the properties of both coins can be seen in the state appearing at the first peak and the last peak. It is considered that the eddy current generated on the coin surface generates a semi-magnetic field characterized by irregularities in the shape of the coin surface, whereby a slight difference in electromotive force generated in each of the two receiving coils is detected. In the prior art, such a difference could not be detected.

Next, the operation | movement of the apparatus 30 which examines the true eye of a coin is demonstrated in detail using FIG. 4 and FIG.

In FIG. 4, the device 30 for inspecting the true eye of the coin drops the coin 3 introduced from the coin inlet 31 to the coin rail 4 provided below the coin inlet 31 by natural falling. The coin 3 dropped to the coin rail 4 falls while rotating in a direction away from the coin inlet 31 via the coin passage 6 (FIG. 1B). The coin 3 moves the outer diameter detecting coil 32, the material detecting coil 33, the female coil 1 of the uneven shaped detecting coil and the receiving coils 2a and 2b while moving in the coin passage 6. To pass. The device 30 checks the true eye of the coin 3 while the coin 3 passes through each of the detection coils. As a result of the test, when it is determined that the coin 3 is true, the distribution solenoid 35 is driven in accordance with the signal output to the output terminal 19 to operate the gate 34, and the coin 3 is not shown in the purification passage. To guide. However, when it is determined that the coin 3 is counterfeit as a result of the inspection, the coin 3 is guided to an unshown discharging passage without operating the gate 34 and discharged from the unshown outlet.

Assuming that the coin 3 is purifying here, the coin 3 guided to the purifying passage continues to fall freely and falls to the coin rail 36 after some time. The coin 3 dropped to the coin rail 36 is distributed for each coin type by a known distributing means (not shown) and discharged from the corresponding discharge ports A, B, C, and D provided for each coin type.

In the above, the inspection means of the outer diameter detecting coil 32 and the material detecting coil 33 can use a known technique.

Here, using the flowchart of FIG. 8, the operation | movement of the apparatus 30 which examines the true eye of a coin by the detection coil which detects an uneven | corrugated shape is explained in full detail. In FIG. 8, when the power is turned on, the apparatus executes initial settings such as input / output in the MPU 20 at step 100. After executing step 100, in the judgment processing of step 101, a process of determining whether or not a coin has been put into the apparatus using the signal of the detection coil is executed. If it is determined in the judgment processing of step 101 that a coin has been put, the program proceeds to the AD conversion processing of step 102. However, if it is determined in the judgment processing at step 101 that no coins have been put in, the waiting process is looped by waiting for the arrival of coins.

If it is determined in the judgment processing of step 101 that a coin has been put, the process proceeds to the AD conversion processing of step 102. The AD conversion process of step 102 is an output signal of the detection circuit 15 which is a signal from the receiving coils 2a and 2b of the detection coil which receives the signal and detects the unevenness when the coin arrives in the detection coil. Start sampling. The sampling result is temporarily stored and held in a memory such as RAM in the MPU 20, and the process proceeds to the calculation processing of step 103.

The arithmetic processing of step 103 is a process of obtaining a correlation coefficient r using the above formula 1 from the values of the digital signal strings temporarily stored and held in the memory and the statistical values of receivable coins stored in the memory 21 in advance. Execution proceeds to the authenticity determination of step 105.

The authenticity judgment of step 105 compares the correlation coefficient obtained by the arithmetic processing of step 103 with a predetermined value of the storeable coins stored in advance, and determines that the detected coin is genuine when the correlation coefficient r> predetermined value. The process proceeds to the purification process of step 106. However, when it is determined that the correlation coefficient r <predetermined value, the detected coin is judged to be a fake, and the counterprocess of step 104 is executed to return to the waiting loop.

In this case, it is assumed that the detected coin is determined to be genuine in the authenticity determination process of step 105, and the purification process of step 106 is executed. The purge process of step 106 returns to the standby loop by executing a process of outputting a purge signal, a coin type signal, and the like according to the determination result.

9A and 9B show the configuration of a detector for detecting the unevenness of the second embodiment of the present invention. The difference from the above-described first embodiment is that the line 5b connecting the center of the magnetic pole surface 40a of the longitudinal end of the chamfered core 40 of the excitation coil 1 is the receiving coils 2a and ( 2b) is orthogonal to the line 5a connecting the center, and the line 5b receives the excitation coil 1 and the receiver so as to pass through the midpoint M of the center C1 of the receiving coil 2a and the center C2 of the receiving coil 2b. Only the coils 2a and 2b are disposed. Since the operation and effect are the same as in the first embodiment, the description thereof is omitted.

10A and 10B are diagrams showing the configuration of a detector for detecting the unevenness of the third embodiment of the present invention. The difference from the first embodiment described above is that the line 5a connecting the centers of the receiving coils 2a and 2b is perpendicular to the coin rail 4 on which the coin 3 falls. It only differs in that it shifts and passes through the center position of the target coin 3. In the case of the third embodiment, since the receiving coils 2a and 2b are arranged at the center of the target coin 3, the detection value is different depending on the difference in the shape of the unevenness at the center of the coin 3, It is suitable for authenticity of coin with or without hole in the center.

11A and 11B are diagrams showing the configuration of a detector for detecting the unevenness of the fourth embodiment of the present invention. The difference from the first embodiment described above is that the line 5a connecting the centers of the receiving coils 2a and 2b by rotating the arrangement of the receiving coils 90 degrees and the center of the magnetic pole face of the core of the excitation coil 1 is different. Perpendicular to the line 5b for connecting the cross section at the center of the excitation coil 1. In this fourth embodiment, since the receiving coils 2a and 2b are arranged at positions corresponding to the centers of the target coins, the authenticity of the coin with the uneven or unchanged coin in the center of the coin is true. The fourth embodiment is suitable.

As described above, the arrangement positions of the receiving coils 2a and 2b (the arrangement positions of the excitation coils corresponding to the arrangement positions of the receiving coils) depend on the difference in the shape of the unevenness on the surface of the target coin to determine the authenticity (center part If there is a difference in the shape of the irregularities with or without the hole, there is a difference in the shape of the irregularities in the periphery of the coin.

In addition, the present invention forms an electromagnetic field by exciting the excitation coil 1 at a frequency where the electromagnetic field only penetrates the surface of the coin and does not penetrate to the center of the coin, thereby measuring the influence of the semi-magnetic field due to the eddy current generated near the coin surface. , The side facing the coin of the receiving coils 2a and 2b is preferably closer to the coin surface.

Thus, as shown in Fig. 12, the positions at which the receiving coils 2a and 2b of the passage wall 7a are arranged, that is, the line 5a connecting the centers of the receiving coils 2a and 2b in Fig. 1a. The receiving coils 2a and 2b are made substantially close to the coin surface by forming the positions where the receiving coils 2a and 2b are disposed along with the material of the high permeability material 200. It may be made to form a state made.

Incidentally, in each of the embodiments described above, the description has been made of the U-shaped excitation coil 1, but one of a different shape may be used as long as it does not deviate from the gist of the present invention.

According to the present invention, it is possible to provide a small and high-performance coin inspection device at a low cost with respect to coins (used for general use).

Claims (32)

As a method of determining the true eyeiness by identifying coins, (a) arranging the excitation coil and the receiving coil electronically coupled to each other in the vicinity of the coin passage; (b) The effect of the semi-magnetic field due to the eddy current generated on the surface of the coin as the coin passes through the electromagnetic field excites the excitation coil at a frequency detected by the receiving coil to generate an electromagnetic field, and the half-coil Detecting an electromagnetic field affected by the magnetic field as an electromotive force signal; and (c) identifying the true eye of a coin having a step of identifying the coin according to the electromotive force signal detected by the receiving coil. The method of claim 1, The step (b) is to determine the true eye of the coin comprising the step of setting according to the material of the coin to identify the frequency. The method of claim 1, The step (c) includes the step of sampling the electromotive force signal detected by the receiving coil at predetermined cycles and performing statistical processing according to the sampling value to detect the characteristic of the coin. . The method of claim 3, The statistical process is Calculating a correlation coefficient with a coin as a reference; And identifying coins according to the magnitude of the correlation coefficient. As a method of determining the true eyeiness by identifying coins, (a) arranging near one side of the coin passage such that the magnetic pole is directed to the coin passage which inclines the excitation coil at a predetermined angle; (b) disposing two receiving coils having substantially the same characteristics near said one side of said coin passage so as to be electronically coupled with said excitation coil; (c) exciting the coil at a predetermined frequency to generate an electromagnetic field; (d) A method of determining the true eye of a coin having a step of identifying the coin in accordance with a signal detected by the two receiving coils when the coin passes through the electromagnetic field. The method of claim 5, The step (a) comprises the step of arranging the excitation coil so that the line connecting the center of the magnetic pole at a predetermined interval with the receiving coil is substantially parallel to the extending direction of the coin passage, The step (b) is a step of arranging the two receiving coils so that the line connecting the center of the two receiving coils and the upper side of the coin rail disposed in the coin passage is substantially parallel to the extending direction of the coin passage. How to determine the authenticity of the coin containing. The method of claim 5, The step (a) includes the step of arranging the excitation coil so that the line connecting the center of the magnetic pole at a predetermined interval with the receiving coil is substantially perpendicular to the extending direction of the coin passage, The step (b) is a step of arranging the two receiving coils so that the line connecting the center of the two receiving coils and the upper side of the coin rail disposed in the coin passage is substantially parallel to the extending direction of the coin passage. How to determine the authenticity of the coin containing. The method of claim 5, The step (a) comprises the step of arranging the excitation coil so that the line connecting the center of the magnetic pole at a predetermined interval with the receiving coil is substantially parallel to the extending direction of the coin passage, The step (b) is a step of arranging the two receiving coils so that the line connecting the center of the two coils and the upper side of the coin rail disposed in the coin passage is substantially perpendicular to the extending direction of the coin passage. How to determine the authenticity of the coin containing. The method of claim 5, And the coin passage is formed such that a coin passing through the coin passage is inclined toward one side of the coin passage in which the excitation coil and the receiving coil are disposed. The method of claim 5, The step (d) compares a signal detected by the two receiving coils with a predetermined coin type characteristic stored in advance, and indicates that the coin is genuine when the signal is within a predetermined allowable range for the characteristic. A method of determining the true eye of a coin comprising the step of determining. The method of claim 5, Step (d) is Bridge circuit means including the receiving coil; Differential amplification means connected to said bridge circuit means; Detection means connected to said differential amplifier means; A discrimination means of discriminating the true eye of a coin identifying a coin using the discrimination circuit means connected to the said detecting means. The method of claim 5, And said two receiving coils determine the true eye of a coin differentially connected to said differential amplifying means. The method of claim 5, The excitation coil is U-shaped magnetic material having the magnetic pole on the same surface and a method for determining the true eye of the coin having a coil wound around the magnetic material. The method of claim 5, And said step (c) comprises the step of setting according to the material of the coin to identify said frequency. The method of claim 5, The step (d) includes the step of sampling the electromotive force signal detected by the receiving coil at predetermined intervals, and performing statistical processing according to the sampling value to detect the characteristic of the coin. Way. The method of claim 15, The statistical processing includes determining a correlation coefficient with a coin as a reference, and identifying the coin's true eye according to the magnitude of the correlation coefficient. As a device for determining the true eye by identifying the coin, An excitation coil and a reception coil arranged to be electronically coupled to each other near a coin passage; Exciting means for generating an electromagnetic field by exciting the excitation coil at a frequency at which the influence of the semi-magnetic field caused by the eddy current generated on the surface of the coin when the coin passes the electromagnetic field is detected by the receiving coil; And an electromagnetic field affected by the semi-magnetic field is detected by the receiving coil as an electromotive force signal, and has identification means for identifying the coin according to the electromotive force signal detected by the receiving coil. The method of claim 17, The frequency is the device for determining the true eye of the coin is set according to the material of the coin to be identified. The method of claim 17, And said identification means samples the electromotive force signal detected by said receiving coil at predetermined intervals, and performs statistical processing in accordance with said sampling value to determine the true eye of a coin. The method of claim 19, And the statistical processing is performed to obtain a correlation coefficient with a coin as a reference and to determine the true eye of a coin performed by identifying the coin according to the magnitude of the correlation coefficient. As a device for determining the true eye by identifying the coin, A woman coil disposed near one side of the coin passage so that the stimulus is directed to the coin passage inclined at a predetermined angle; Two receiving coils having substantially the same characteristics disposed near the one side of the coin passage so as to be electronically coupled to the excitation coil; Excitation means for exciting the excitation coil at a predetermined frequency to generate an electromagnetic field; An apparatus for discriminating the true eye of a coin having identification means for identifying the coin in accordance with the signals detected by the two receiving coils when the coin passes through the electromagnetic field. The method of claim 21, The excitation coil is arranged such that a line connecting the center of the magnetic pole at predetermined intervals with the receiving coil is substantially parallel to the extending direction of the coin passage. The two receiving coils are located above the coin rails arranged in the coin passage, and the cores of the coin arranged so that the line connecting the centers of the two receiving coils are substantially parallel to the extending direction of the coin passage. Device. The method of claim 21, The excitation coil is arranged such that a line connecting the center of the magnetic pole at predetermined intervals with the receiving coil is substantially perpendicular to the extending direction of the coin passage. The two receiving coils are located above the coin rails disposed in the coin passage, and the cores of the coin arranged so that the line connecting the centers of the two receiving coils are substantially parallel to the extending direction of the coin passage. Device. The method of claim 21, The excitation coil is arranged such that a line connecting the center of the magnetic pole at predetermined intervals with the receiving coil is substantially parallel to the extending direction of the coin passage. The two receiving coils are located above the coin rails disposed in the coin passage, and the cores of the coin arranged so that the line connecting the centers of the two receiving coils are substantially perpendicular to the extending direction of the coin passage. Device. The method of claim 21, The coin passage is a device for discriminating the true eye of the coin is formed so that the coin passing through the coin passage is inclined to one side of the coin passage in which the excitation coil and the receiving coil is disposed. The method of claim 21, The identification means compares a signal detected by the two receiving coils with a predetermined coin type characteristic stored in advance, and determines that the coin is genuine when the signal is within a predetermined allowable range for the characteristic. A device for determining coin's seriousness. The method of claim 21, The identification means Bridge circuit means including the receiving coil; Differential amplification means connected to said bridge circuit means; Detection means connected to said differential amplifier means; An apparatus for discriminating the true eye of a coin having discrimination circuit means connected to said detecting means. The method of claim 21, And the two receiving coils determine the true eye of a coin differentially connected to the differential amplifying means. The method of claim 21, The excitation coil is a device for determining the true eye of the coin having a U-shaped magnetic material having the magnetic pole on the same surface and a coil wound around the magnetic material. The method of claim 21, The frequency is the device for determining the true eye of the coin is set according to the material of the coin to be identified. The method of claim 21, And said identification means samples the electromotive force signal detected by said receiving coil at predetermined intervals, and performs statistical processing in accordance with said sampling value to determine the true eye of a coin. The method of claim 31, wherein And the statistical processing determines a correlation coefficient with a coin as a reference and discriminates the true eye of a coin performed by identifying the coin according to the magnitude of the correlation coefficient.