JPH09245214A - Coin discrimination device having temperature compensation function for coin processing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the exclusion capability to the forged coins and also to improve the reliability of the device with correction of the temperature by exciting a magnetic sensor with an exciting signal produced by synthesizing frequency of low and high levels and combining a plurality of types of basic feature value that are extracted from the output of the secondary coils. SOLUTION: The coins are sent from a coin processing machine along the path surface 11 of a magnetic sensor 10, and an exciting signal produced by synthesizing the low and high frequency signals is outputted to the primary coils 42, 21 and 31 of the sensor 10 respectively from an excitation means. Under such conditions, the detection signals of the secondary coils 43, 23 and 33 undergo the arithmetic processing and are outputted as digital signals DL1, DH1, DL2 and DH2. At the same time, the temperature of a reference frame table is corrected, based on the temperature that is measured while the sensor 10 is excited. Then the basic feature value is calculated, based on the detection signals DL1 to DH2 which are obtained by the carriage of coins. Furthermore, the combination feature value is calculated from the basic feature value. Then the combination feature value is compared with a selected reference frame according to the detected temperature stored previously. Thus the genuineness and denominations of coins are decided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for a coin processing machine such as a coin sorting machine, a coin depositing machine, and a coin packaging machine, and can reliably identify the coin denomination and authenticity of a coin without being affected by temperature. To a highly reliable coin discriminating device with a temperature correction function.

[0002]

2. Description of the Related Art There are various types of coin processing machines such as a coin sorting machine, a coin depositing machine, and a coin packing machine. For example, a coin of mixed denominations is put on a horizontal rotary table to centrifugal force. To send out coins, and move the coins on the passage by forcible transfer means such as a belt, and a magnetic sensor (material sensor)
Identify the authenticity of coins and the denomination.

For example, Japanese Examined Patent Publication No. 50792/1993 discloses a material sensor used for a coin sorter or a coin depositing machine having a forced transfer means to identify the coin denomination and authenticity. That is, as shown in FIG. 18, the material sensor 100 is entirely molded by resin or the like and integrated,
Central part 101 and upper central part 102 for passing coins
And are open. A secondary coil 105 and a primary coil 104 for excitation are wound around a bottom primary core 103, and a secondary core 1 separated left and right at a center 102 is provided at an upper part.
06 and 107 are provided, and these secondary cores 10 are provided.
Secondary coils 108 and 109 are provided at 6 and 107, respectively.
Is wound.

Further, Japanese Utility Model Publication No. 4-35976 is suitable for a coin classifier, a coin depositing machine, etc., which can be immediately applied to coins of each country only by changing software, so that the denomination and authenticity of coins can be surely identified. A material sensor having the above structure is shown. That is, by applying two kinds of excitation signals (high frequency and low frequency) to one material sensor, 2
An example is disclosed in which two signals are separated to identify coins. Further, since the sensitivity of the material sensor changes depending on the temperature, there is a method described in Japanese Patent Publication No. 4-6998 which copes with this.

[0005]

However, the sensor of the coin processing machine disclosed in Japanese Patent Publication No. 5-50792 does not have much information obtained from the sensor, and similar coins, that is, counterfeit coins and foreign coins similar to true coins. There is a problem that the exclusion ability is low. Further, the sensor of Japanese Utility Model Publication No. 4-35976 has a problem that the size becomes large in order to stably obtain the information on the diameter, and further there is a problem that the ability to remove foreign coins similar to the 500-yen coin is low. .

Further, with the increase in the number of overseas travelers in recent years, the number of people who misuse foreign coins in Japan is increasing, and reliable detection of such foreign coins is required for the coin processing machine. In the apparatus of Japanese Patent Publication No. 4-6998, the temperature is corrected, but the temperature cannot be detected until the flow of coins is interrupted, and it is impossible to constantly monitor the temperature.

The present invention has been made under the circumstances as described above, and an object of the present invention is to provide a coin discriminating apparatus with a temperature correcting function in a coin processing machine which has an improved ability to detect similar coins and is capable of constant temperature detection. To provide.

[0008]

SUMMARY OF THE INVENTION The present invention provides a coin discriminating apparatus with a temperature correction function in a coin processor for conveying coins along a passage surface by a conveyor belt and detecting denomination and authenticity of the conveyed coins by a sensor. The above object of the present invention relates to a rectangular parallelepiped-shaped first primary core provided on one side of the passage surface and a rectangular parallelepiped-shaped second primary core provided on one side of the passage surface. A core, a cylindrical third primary core provided on one side of the passage surface between the first primary core and the second primary core, and provided on the other side of the passage surface A rectangular parallelepiped-shaped first secondary core and a rectangular parallelepiped-shaped second secondary core provided on the other side of the passage surface, and a magnetic sensor;
Excitation means for applying an excitation signal that combines a high frequency and a low frequency to each primary coil of the secondary core; from the excitation signals applied to each primary coil of the first to third primary cores by the excitation means Temperature detecting means for detecting a temperature by separating low frequency components and detecting a voltage of all or any one of the primary coils of the first to third primary cores; and the first and second The output of each secondary coil of the secondary core and the output of the secondary coil wound around the third primary core are taken in to separate each output into high-frequency and low-frequency components, which are used as basic feature quantities. Along with this, a feature amount calculating means for calculating a combined feature amount from the basic feature amount; and the basic feature amount and the combined feature amount calculated by the feature amount calculating means or a preset reference frame of a true coin. Either one of Is achieved by providing; authenticity compared to other after correction based on the detected temperature, and discriminating means for discriminating the denomination.

Further, it is possible to achieve more effectively by calculating the combined feature amount by multiplying and / or dividing the basic feature amount. Further, as the combination feature amount, proximity in the vicinity of edge / (conductivity ² × thickness ² × diameter ² × average proximity), (proximity in the vicinity of edge × diameter ² )
/ Average proximity, minimum in-plane proximity / Edge proximity,
Diameter ² / (average proximity x edge proximity), diameter ²
It can be achieved more effectively by calculating at least one of / average proximity, conductivity x thickness.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a coin to be conveyed is identified by using an integrally molded magnetic sensor 10 as shown in FIGS. That is, the magnetic sensor 10 has a U-shape, the bottom of the space in the center forms a passage surface 11 for coins, and the outer surface is provided with a shield plate 12 for blocking external magnetic layers. There is. The magnetic sensor 10 is provided with transmission detection type rectangular parallelepiped side sensors 20 and 30 on both sides of the passage surface 11, and a proximity detection type (hereinafter referred to as a reflection detection type) below the passage surface 11. A cylindrical center sensor 40 is provided. The side sensors 20 and 30 are symmetrical, and the side sensor 20 has a primary coil 21 wound around it.
The secondary side core 22 and the secondary coil 23 are wound around 2
The side sensor 30 comprises a primary side core 32 wound with a primary coil 31 and a secondary side core 34 wound with a secondary coil 33. In addition, the center sensor 40 is a cylindrical pot core 4
1 and has a primary coil 42 on the outer peripheral surface of the pot core 41.
Is wound, and the secondary coil 43 is wound and embedded in the inner peripheral surface.

FIG. 3 shows primary coils 21, 31, 42 and 2
It shows the connection relationship of the next coils 23, 33, 43, and
The secondary coils 21 and 31 are connected in series, and are connected to the excitation means 50 together with the primary coil 42 connected in parallel. Further, a limiting resistor LR (about 150Ω) is connected in series to the exciting means 50 and the primary coils 21, 31, 42.
The output of the primary coil, that is, the voltage drop component output SG4 due to the parallel resistance (about 1.5Ω) of the primary coils 21 and 31 and the primary coil 42 is connected to the amplifier 80. or,
The secondary coil 43 is connected to the amplifier 60 and is connected to the secondary coil 2
3 and 33 are respectively connected to a summing amplifier 70 so that the respective detection signals are added and amplified.

FIG. 4 shows an exciting means 50 of the magnetic sensor 10 and an output signal processing circuit.
The next coils 42, 21 and 31 are excited by the excitation signal EXS from the excitation means 50. Excitation means 5
0 is a low-frequency oscillator 51 that oscillates and outputs a low-frequency signal (4 KHz in this example) LS, and a high-frequency signal (250 in this example).
KHz) HS for oscillating and outputting, an amplifier 53 for synthesizing (superimposing) and amplifying the low frequency signal LS and the high frequency signal HS, and a signal synthesized and amplified by the amplifier 53 for the primary coil 42 of the magnetic sensor 10. , 21 and 31 are applied to the drive circuit 54 as an excitation signal EXS.

The detection signal SG1 of the secondary coil 43 of the center sensor 40 of the magnetic sensor 10 is amplified by the amplifier 60, input to the low pass filter (LPF) 61 and the high pass filter (HPF) 65, and output SL of the LPF 61.
Reference numeral 1 is a full-wave rectification circuit 62, an LPF 63, and an A / D converter 64 that becomes a digital signal (reflection 4 KHz) DL1,
The output SH1 of the HPF 65 is the full-wave rectification circuit 66, the LPF 6
A digital signal (reflection 25
0 KHz) DH1. Further, the detection signals SG2 and SG3 of the respective secondary coils 23 and 33 of the side sensors 20 and 30 of the magnetic sensor 10 are added (superposed) and amplified by the addition amplifier 70, and the amplified output signal SG4 thereof is L.
The output SL2 of the LPF 71, which is input to the PF 71 and the HPF 75, becomes a digital signal (transmission 4 KHz) DL2 by the A / D converter 74 via the full-wave rectification circuit 72 and the LPF 73, and the output SH2 of the HPF 75 is the full-wave rectification circuit 76, LP.
The digital signal (transmission 250 KHz) DH2 is output from the A / D converter 78 through F77. The output SG4 of the primary coil of the magnetic sensor 10 is converted into a digital signal TM by an A / D converter 84 via an LPF 81, a full wave rectifying circuit 82 and an LPF 83 via an amplifier 80. In addition, SG2, SG3
In this example, they are added and amplified, but they may be processed independently.

The digital signal D obtained as described above
L1, DH1, DL2, and DH2 are input to a feature amount calculation means such as a microcomputer to calculate a plurality of basic feature amounts, and a combined feature amount for determination is calculated from the basic feature amounts, and further, the basic feature amounts. The amount and the combination feature amount are input to the discriminating means and compared with a preset reference frame of the true coin to discriminate the authenticity or denomination of the coin. Further, the digital signal TM is inputted to the temperature detecting means to measure the environmental temperature of the coin processing machine, and selects a reference frame tabulated according to the measured environmental temperature.

An example of the operation of the above configuration will be described. FIG. 5 shows a basic operation example of the present invention.
First, the temperature of the reference frame table is corrected in accordance with the measured temperature (step S10), and thereafter, the detection signals DL1, DH1, and DL1 from the magnetic sensor 10 obtained as the coin is transported
A basic feature amount is calculated based on DL2 and DH2 (step S20), and a combined feature amount is further calculated from the basic feature amount (step S21). Then, the operation of determining the authenticity of the coin and the denomination by comparing with the reference frame which is stored in advance and selected according to the detected temperature (step S22) is continued until the coin is exhausted (step S23). It should be noted that the temperature correction is continuously performed before the processing is started or during the coin flowing operation. Although the details of each operation will be described later, the operation of the magnetic sensor 10 used in the present invention will be described first.

The coins of the coin processing machine are designed to be conveyed along the passage surface 11 of the magnetic sensor 10, and the primary coil 42, 21, 31 of the magnetic sensor 10 has an exciting means 50.
The excitation signal EXS is applied from. Excitation means 50
Is a low frequency signal LS as shown in FIG.
The high frequency signal HS as shown in FIG. 6B is combined and amplified by the amplifier 53, and then the drive circuit 54 outputs the excitation signal EXS as shown in FIG. 6C. In the state where the primary coils 42, 21, 31 of the magnetic sensor 10 are excited by the excitation signal EXS, the coin is the passage surface 1
1 is conveyed by a belt or the like, but the detection signals SG2 and SG3 of the secondary coils 23 and 33 are input to the addition amplifier 70 and added, and an amplified output signal SG5 as shown in FIG. 6D is obtained. SG5 is LPF71 and is shown in FIG.
As shown in (E), only the low frequency component SL2 is obtained, and this low frequency component is output as the digital signal DL2 through the full-wave rectifier circuit 72, the LPF 73, and the A / D converter 74. Further, the signal SG5 is input to the HPF 75, and the high frequency component SH2 is separated as shown in (A1) or (B1) of FIG. 7, and the high frequency component SH2 is the full wave rectification circuit 76 and is shown in (A2) or (B2) of FIG. 7), the full-wave rectified waveform SH21 is further input to the LPF 77, and the full-wave rectified waveform SH21 is input to the LPF 77.
A low frequency component SH22 such as 3) or (B3) is obtained, and this low frequency component SH22 is output as a digital signal DH2 by the A / D converter 78. In addition, in FIG.
1) to (A3) show the case without coin, and (B
1) to (B3) show the case with coins.

On the other hand, the detection signal SG1 of the secondary coil 43 of the magnetic sensor 10 is input to the amplifier 60 and amplified, and is processed in substantially the same manner as described above in the subsequent stage, but reflection 250 KHz.
The digital signal DH1 of indicates a signal indicating the presence or absence of a coin hole. Digital signals DL1 and DL of various coins
2, DH1 and DH2 will be described later.

As described above, the magnetic sensor 10 is driven by the drive circuit 54.
The temperature correction (step S10) is first performed in the state of being excited by the excitation signal EXS from (4), and details thereof are as shown in FIG. That is, first, the output SG of the primary coil
4 is an amplifier 80, an LPF 81, a full-wave rectification circuit 82, an LP
Digital signal TM with A / D converter 84 via F83
Then, the temperature is detected by inputting the digitel signal TM to the temperature detecting means (step S11), and the environmental temperature is recognized (step S12). Note that the impedance of the primary coils 21, 31, 42 at 4 KHz is approximately equal to the DC resistance component of the copper of the coils and changes linearly with temperature, so the temperature can be recognized. Next, the reference frame for determining the basic feature amount and the combined feature amount of each coin at the ambient temperature is selected from the preset temperature correction table (step S13), and the identification process is performed based on the selected reference frame. Implement (step S14).
Although the temperature is detected here during standby, it is possible to detect the temperature and select the reference frame even while the coin is being conveyed (during counting). The temperature correction table is provided, for example, in the range of 0 ° C to 50 ° C at every 5 ° C.

The reference frame is preset for each denomination coin according to various temperatures, and the reference frame of the corresponding temperature is selected and set according to the detection of the environmental temperature.
For temperature compensation, the resistivity of the copper used in the coil is a function of temperature, so it is measured to recognize the temperature. That is, as shown in FIG. 9, the volume resistivity of copper changes almost linearly with temperature, and when the value at 20 ° C. is used as a reference, it shows a change of 0.4% / ° C. The temperature can be recognized from the measured resistance value of. Further, FIG. 10 shows the relationship between the temperature detection according to the present invention and the actual temperature, and it can be seen that the temperature detection according to the present invention enables correction. A temperature correction table is created based on this relationship.

When the temperature correction as described above (step S10) is completed, the characteristic amount calculating means calculates the basic characteristic amount (step S20). The basic feature amount is based on the output attenuation amount from the standby output by excitation of two frequencies for two types of cores, transmission and reflection, except for reflection 250 KHz (digital signal DH1). The basic feature amount is a value (attenuation rate) obtained by dividing by the output and multiplying by a constant. In addition, reflection 250KH for obtaining local proximity information
With z (DH1), the basic feature is a value obtained by dividing the minimum attenuation value at the edge and the minimum attenuation value on the coin surface where there is little output variation due to the presence or absence of patterns (front and back) by the standby output and multiplying by a constant. The amount is.

FIG. 11 shows a 1-yen coin (the same figure (A)), a 5-yen coin (the same figure (B)), a 10-yen coin (the same figure (C)), 50
Yen coin (Figure (D)), 100 yen coin (Figure (E)),
Magnetic sensor 10 for a 500-yen coin ((F) in the figure)
The waveform examples of the outputs DL1, DH1, DL2, DH2 are shown for the coin transport speed of about 1800 mm / sec. From FIG. 11, it can be seen that a signal indicating a coin hole appears in the reflected digital signal DH1 of 250 KHz. FIG. 12 shows the relationship between the standby output, the minimum and maximum values of the attenuation amount, and the edge attenuation amount in the calculation of the basic feature amount. FIG. 12 shows an example of a 50-yen coin,
The same figure (A) has shown the output waveform example of signal DH1 of reflection 250 KHz, and the same figure (B) has shown the output waveform example of signals DL1, DL2, and DH2 other than reflection 250 KHz. In addition, Fig. 13 shows the "engraved" edge part of a coin with the same material and the same size as a 500 yen coin and a 500 yen coin.
There is a true coin (FIG. (A) in the figure) with and a counterfeit coin (B in the figure) without “engraving” in the edge portion. The greater the attenuation, the shallower the edge is carved. That is, the edge output indicates the proximity in the vicinity of the edge, and the unengraved counterfeit coin has a large proximity to the magnetic sensor 10 in the vicinity of the coin edge, and thus the output attenuation in the edge increases.
Further, the proximity of the edge is less affected by the presence or absence of the pattern as compared with the central part of the coin, so that the output attenuation of the normal coin is stable. That is, the waveform at the bottom of the signal differs depending on the pattern on the surface of the coin, but the edge portion is not affected by the difference in the pattern and remains at a stable fixed position.

On the other hand, FIG. 14 shows a state in which the presence or absence of a hole in a coin is detected. FIG. 14A shows an output waveform example of a 100-yen coin without a hole, and FIG. The example of an output waveform of a 50-yen coin is shown. That is, when the output attenuation ratio is calculated by dividing the minimum attenuation value of the output waveform by the output attenuation of the edge part, the output attenuation ratio is large when there is no hole, and the output attenuation ratio becomes smaller when the coin has a hole. The presence or absence of a hole can be detected by.

The feature amount calculating means performs the calculation shown in Table 1 below for each value obtained as described above.

[0024]

[Table 1] That is, for the digital signal DL2, the maximum attenuation amount /
The standby output = B is obtained, and the maximum attenuation amount / standby output = C is similarly obtained for the digital signal DH2. Here, the main information of the basic feature amount B is conductivity × thickness × diameter, and the larger each value is, the larger the main information amount of the basic feature amount C is the diameter of the coin, and the larger the diameter is, the larger the value is. . The maximum attenuation value / standby output = D is obtained for the digital signal DL1, and the main information of the basic feature value D is conductivity × thickness × average proximity, and the larger the conductivity and the thickness, On average, they get larger as they get closer. Further, for the edge of the digital signal DH1, the edge attenuation amount / standby output = A is obtained, and for the minimum value of the digital signal DH1, the attenuation minimum value / standby output = MIN is obtained. Here, the basic feature amount A increases as the edge height decreases. The edge proximity is shown, and the basic feature amount MIN shows the minimum in-plane proximity that increases as the degree of the concave portion in the surface increases.

Basic feature amount A obtained as described above
The following combination feature amounts E to J are calculated for D to MIN (step S21). That is, the combination feature amount E
= A / BCD, F = ABC / D, G = MIN / A, H =
BC / AD, I = BC / D, J = B / C are obtained. still,
Although not expressed by the above formula, the combination feature amounts E to J
Uses a value obtained by multiplying the calculation result of each basic feature amount by a constant. Here, the combination feature amount E indicates the proximity in the vicinity of edge / (conductivity ² × thickness ² × diameter ² × average proximity), and the proximity is average on the basis of the conductivity, the thickness, and the size of the diameter. However, the lower the edge height, the larger it becomes. The combined feature amount F indicates (proximity to edge vicinity × diameter ² ) / average proximity value, and becomes larger as the edge height and the diameter are larger, although they are closer to each other on average. The combined feature amount G indicates the minimum in-plane proximity / proximity to the edge vicinity, and becomes larger as the degree of the concave portion in the surface becomes smaller even if the edge height is low, and becomes smaller if the coin has a hole. Further, the combined feature amount H indicates a diameter ² / (average proximity degree × edge proximity proximity degree), and the larger the diameter is, the closer it is,
The combined feature amount I indicates a diameter ² / average degree of proximity, and the larger the diameter is, the larger the diameter is, although the average distance is close.
The combined feature amount J indicates conductivity × thickness, and increases as the conductivity and thickness increase.

The discriminating means discriminates the authenticity or denomination of coins by comparing with the preset reference frame of the true coins at the preset temperature by using the combination feature amounts E to J calculated as described above. Yes (step S22). That is, when all of the calculated combination feature amounts are all within the reference frame of any denomination of each denomination coin set in advance, it is determined to be that denomination. If even one combined feature amount is outside the reference frame, or if one coin corresponds to a plurality of denominations in the determination result, it is rejected.

In the above description, the basic feature quantities A to D and MIN.
5 and the combination feature amount is 6 types E to J,
These characteristic amounts may be variously calculated according to the coins and denominations of each country. Further, although 4 KHz is used as the low frequency and 250 KHz is used as the high frequency, these frequencies can be appropriately changed.

[0028]

[Example] FIG. 15 shows how to identify a Thai 1 Baht coin with similar characteristics to Japanese 500 yen coins.
The figure (A) shows that the basic feature amount B of the 1 baht coin is within the standard frame of the 500 yen coin, and the diagram (B) shows the basic feature amount D of the 1 baht coin is the 500 yen coin. (C) shows that the basic feature amount C of the 1 baht coin is in the reference frame of the 500-yen coin. Therefore, in the determination based on the basic characteristic amounts B to D, the 1 baht coin is misidentified as a 500-yen coin. However, in the present invention, the basic feature quantities BD
The combination feature amount I = (BC / D) is used, and the combination feature amount I of 1 baht coin is shown in FIG.
As shown in (D), it is outside the reference frame for 500-yen coins, so it is not erroneously identified.

FIG. 16 shows how to identify a Korean 500 Won coin, which has characteristics similar to those of a Japanese 500 Yen coin. In FIG. 16A, the basic feature amount B of a 500 Won coin is 5
It shows that it is within the standard frame of 00 yen coins,
In the same figure (B), the basic feature amount C of 500 Won coin is 500.
It indicates that the coin is within the standard frame. Therefore, in the determination of the basic feature amounts B and C, the 500 Won coin is erroneously identified as a 500 yen coin. However, in the present invention, the combined feature quantity J that is a combination of the basic feature quantities B and C is used.
(= B / C) is used, and the combination feature amount J of the 500 Won coin is outside the reference frame of the 500-yen coin as shown in FIG.

In the embodiment described above, the amplifier 6
Although 0, 70, and 80 have been described as an example in which they are provided in the processing circuit of the detection signal of the magnetic sensor 10, FIG.
As shown in FIG. 7, the amplifiers 60, 70, 80 may be incorporated in the sensor 10 as a preamplifier 90. Note that FIG.
1 is a modified example of the magnetic sensor 10 shown in FIG. 1, showing a magnetic sensor 10 including a preamplifier 90 and side sensors 20 and 30 formed in a shape that is easily mounted on a belt transport mechanism. There is. Further, in the above-described embodiment, each basic feature amount does not necessarily have to be standardized by dividing the output attenuation by the standby output, and the attenuation amount itself may be used. The limiting resistor connected to the magnetic sensor 10 is not always necessary if the exciting means is a constant current source. Although the reference frame table is changed, the output value may be changed and corrected corresponding to the detected temperature and compared with one reference frame. Further, although the voltage drop across the combined resistance of the primary coils 21, 31, 42 is used, the present invention is not limited to this, and the voltage drop of any one of the primary coils may be used.

[0031]

According to the present invention, the reflection-type and transmission-type magnetic sensors are excited by an excitation signal obtained by combining high frequency and low frequency,
Since a plurality of types of basic feature quantities are extracted from the output signal of each secondary coil and the basic feature quantities are combined with each other to calculate the combination feature quantity for determination, these basic feature quantities and combination feature quantities are calculated. Depending on the quantity, the ability to eliminate similar coins can be increased. Further, since temperature correction can be performed at all times, more reliable identification is possible. It is possible to extract a plurality of basic feature quantities from one magnetic sensor and combine these basic feature quantities to arbitrarily increase the combination feature quantity for judgment. Even if a new similar coin is discovered, the calculation method By devising, it is possible to eliminate new similar coins.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective structural view showing an example of a magnetic sensor used in the present invention.

FIG. 2 is a sectional structural view of a magnetic sensor used in the present invention.

FIG. 3 is a wiring diagram of a magnetic sensor used in the drawing of the present invention.

FIG. 4 is a block diagram showing an example of an exciting unit of a magnetic sensor and a processing circuit of a detection signal of the magnetic sensor.

FIG. 5 is a flowchart showing an example of basic operation of the present invention.

FIG. 6 is a waveform chart of each part showing an operation example of signal processing of the present invention.

FIG. 7 is a waveform chart of each part showing an operation example of signal processing of the present invention.

FIG. 8 is a flowchart showing an example of temperature correction operation according to the present invention.

FIG. 9 is a diagram showing the relationship between the volume resistivity of copper and temperature.

FIG. 10 is a diagram showing a relationship between temperature detection and an actual temperature according to the present invention.

FIG. 11 is a diagram showing an output waveform of a magnetic sensor for each coin.

FIG. 12 is a diagram illustrating calculation of a basic feature amount.

FIG. 13 is a diagram showing how to detect the presence or absence of carved edges.

FIG. 14 is a diagram illustrating the operation of detecting the presence / absence of a hole in a coin.

FIG. 15 is a diagram showing an example of identifying a Thai 1 baht coin.

FIG. 16 is a diagram showing an example of identifying a Korean 500 Won coin.

17 is a partial cross-sectional perspective structural view showing a modified example of the magnetic sensor of FIG.

FIG. 18 is a diagram showing a structural example of a conventional material sensor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 magnetic sensor 11 passage surface 20,30 side sensor 40 center sensor 50 excitation means 54 drive circuit 60,70 amplifier 61,63,67,71,73,77,81,83
Low-pass filter (LPF) 65,75 High-pass filter (HPF) 90 Preamplifier

Claims (2)

[Claims] 1. A coin discriminating device in a coin processing machine, wherein a coin is conveyed along a passage surface by a conveying belt, and a denomination and authenticity of the conveyed coin are detected by a sensor, which is provided on one side of the passage surface. A rectangular parallelepiped-shaped first primary core and a rectangular parallelepiped-shaped second core provided on one side of the passage surface.
Primary core, a cylindrical third primary core provided on one side of the passage surface between the first primary core and the second primary core, and the other of the passage surfaces. A first rectangular parallelepiped-shaped secondary core and a rectangular parallelepiped-shaped second secondary core provided on the other side of the passage surface, and a magnetic sensor; Excitation means for applying an excitation signal obtained by combining a high frequency and a low frequency to each of the primary coils of the primary core of No. 3, and the first to the third by the excitation means.
Of the first to third primary cores by separating low frequency components from the excitation signal applied to the primary coils of the primary cores.
Temperature detecting means for detecting the temperature by detecting the voltage of all or any of the secondary coils; the output of each secondary coil of the first and second secondary cores, and the third primary core A characteristic amount calculating means for taking in the output of the wound secondary coil, separating each output into a high frequency component and a low frequency component as a basic characteristic amount, and calculating a combined characteristic amount from the basic characteristic amount; Either one of the basic feature quantity calculated by the feature quantity calculation means and the combination feature quantity or a preset reference frame of the true coin is corrected based on the temperature detected by the temperature detection means, and then the other. A coin discriminating apparatus with a temperature correcting function in a coin processing machine, comprising: a discriminating unit for discriminating between authenticity and denomination by comparing; 2. The combination feature amount includes proximity proximity to edge / (conductivity ² × thickness ² × diameter ² × average proximity), (proximity to edge proximity × diameter ² ) / average proximity,
Minimum in-plane proximity / proximity to edge, diameter ² / (average proximity × proximity to edge), diameter ² / average proximity,
2. At least one of conductivity × thickness is included.
A coin discriminating device with a temperature correction function in the coin processor.