JPS6063691A - Coin discriminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coin discriminating device, and more particularly to a coin discriminating device for discriminating commonly used coins or medals used in gaming machines using medals based on their materials. It is.

Conventionally, there have been two types of coin discrimination devices: an outer shape discrimination method that discriminates based on the outer shape, and a material discrimination method that discriminates the coin based on the material of the coin itself.

The column type discrimination method is the diameter, thickness, and weight of the coin.

The presence or absence of a central hole, as well as the presence or absence of peripheral serrations, etc., were mechanically measured to determine authenticity. However, when trying to distinguish coins by their external shape, counterfeit coins that have the same shape as commonly used coins are judged as genuine coins, and genuine coins that are worn out, for example, are judged as genuine coins. , or deformed genuine coins, etc., have the disadvantage of being judged as counterfeit coins. Furthermore, the performance of identifying dust or dirt on coins deteriorates, and genuine coins may also be judged as counterfeit coins.

In addition, as a material sorting method, coins that have been roughly sorted by appearance are generally placed in the transfer path of the coin, and authenticity is judged by the magnetism of the coin, or the above-mentioned magnet is used to A direct current magnetic field is formed, and due to the correlation effect of the eddy current magnetic field due to the coin rolling in the direct current magnetic field,
It was used to determine the authenticity of coins. However, although this sorting method using the eddy current magnetic field generated by coins rolling in a strong DC magnetic field is effective against counterfeit coins, which have a material that is significantly different from genuine coins, There was a drawback that counterfeit coins that were not different from each other were recognized as genuine coins.

In view of these points, a method for electronically sorting coins has been developed in recent years, but in general, as described above, after mechanical shape sorting is carried out in advance, a method is used instead of the direct current magnetic field mentioned above to measure the material quality. This method used a high-frequency magnetic field.

In the conventional sorting method as described above, the main focus is on shape sorting, so after years of use of the sorter, the shape measuring part may become deformed or worn out, and even dust or dirt attached to the coins may appear. Due to such adhesion, etc., the sorting accuracy was significantly reduced. Furthermore, although counterfeit coins that have the same shape as genuine coins will pass through, genuine coins whose shape has changed due to wear or deformation will be identified as counterfeit coins, which is the nature of the sorting machine. It was something that could thwart even the intended purpose.

Therefore, the present invention has been made in view of the drawbacks of the conventional coin discriminating device described above, and its purpose is to simply sort out the material of the coins without adding external sorting. To provide a coin discriminating device that can correctly determine whether a deformed or worn coin or a coin with dust or the like is attached by determining whether the coin is genuine or false.

i11 In order to achieve the above-mentioned object, the present invention includes a reference part to which the reference part is fixed and a passage part through which coins to be discriminated pass, and each of the reference part and the passage part is connected to an excitation coil and the excitation coil. a detection filter that generates an induced voltage, and an induced voltage at the reference detection filter,
A voltage comparison circuit with the induced voltage in the passage detection coil is provided,
The device is characterized in that it is formed so as to determine whether the coin is genuine or false based on the comparison result.

The present invention will be described below with reference to illustrated embodiments.

The present invention includes a passage section 20 provided in the transfer path 11 onto which the coin d' inserted into the input hole 10 falls, and a reference section 30 provided separately from this passage section 20-.

The passage part 20 is provided in the transfer path 11, and specifically has a passage hole 21 formed inside thereof that is larger than the coin in order to allow the coin C to pass therethrough, and a passage detection coil is installed on the outer periphery of this passage hole 21. 22, and further this passage detection coil 22
It is formed by wrapping a passing excitation filter 23 around its outer periphery.

This passing excitation coil 23 causes an induced current to be generated in the passing detection coil 22 by being energized.

On the other hand, the reference part 30 is formed in the same shape as the passage part 20 described above, and has a reference part 31 made of the same material as the coin C inserted through the insertion hole 10 fixed therein. Furthermore, a reference detection coil 32 is wound around the outside of this reference part 31.
Furthermore, a reference excitation coil 33 is wound around the outside of this reference detection coil 32.Therefore, in this reference part 30,
When the reference excitation coil 33 is energized, an induced current of a constant voltage flows through the reference detection coil 32 with the reference part 31 sandwiched therebetween.

In addition, the transfer path 11 includes: - At the lower part of the passage section 20, - A genuine currency passage 12 facing directly below, and a counterfeit passage 1 facing laterally.
3, and a plate 15 is provided in the genuine coin passage 12 portion of this bifurcated part, which can freely protrude into the passage by means of a fill 14. Therefore, in the passing part 20 The coin C determined to be a genuine coin is determined to be a counterfeit coin, although the plate 15 retreats from above the genuine coin passage 12 and is guided to the genuine coin passage 12 directly below by the operation of the coil 14. The coins C are distributed to the board 15 and then guided to the counterfeit coin passage 13.

Next, the operation of the coin discrimination device according to the present invention will be explained with reference to the block diagram shown in FIG.

First, the oscillation section 40 oscillates a high frequency of about 10 to 200 KHz, and after this high frequency is amplified by the power amplification section 41,
The pass excitation coil 23 and the reference excitation filter 33 are excited to meet the same conditions. Then, the excitation of the pass excitation coil 23 causes an induced current to flow in the pass detection coil 22, and at the same time, the excitation of the reference excitation coil 33 causes an induced current to flow in the reference detection coil 32. An induced current will also flow.

Both such detection coils 22 and 32 are connected to the voltage comparator circuit 4.
2, the voltage of the induced current flowing in each can be compared.
It is formed. This voltage comparison circuit 42 includes a reference section 31
The voltage induced in the reference detection coil 32 at the fixed reference portion 30 and the voltage of the induced current flowing in the passage detection coil 22 when the coin C passes are formed to have opposite phases. However, at this time, each other's induced voltage may be affected by temperature, humidity, material, etc.
Since there may be differences due to manufacturing etc., these are formed so as to be adjustable so that they are in opposite phases to each other. Specifically, the reference detection coil 32 and the passing excitation coil 22 are connected by a variable resistor 43, and both detection coils 32
．． Since there may be a case where there is a phase difference in the voltage generated by the voltage generator 22 and the phase cannot be completely reversed, a capacitor 44 and a variable resistor 45 for phase adjustment are also provided. Therefore, the coin C made of the same material as the reference part 31 is in the passage part 2.
0, the passing excitation coil 23 and reference excitation coil 33 are excited in advance with an accurate sine wave, and the voltage comparator circuit 42 is adjusted by adjusting the variable resistor 43 and the variable resistor 45 for phase adjustment described above. The signal voltage at can be made almost zero.

In this way, the signal voltage from the voltage comparison circuit 42 is rectified via the signal amplification section 46 and the rectification section 47. However, when a hard 7″C made of the same material as the reference portion 31 passes through the passage portion 20, the signal voltage becomes zero, so no rectified voltage is generated.

The rectifying section 47 is then connected to a Schmitt circuit 48. This Schmitt circuit 48 is formed as a circuit that operates when no rectified voltage is generated, that is, when there is no input. Therefore, conversely, the passage section 20
When the coin C has not passed, the passage detection coil 2
Since the induced voltages between 2 and the reference detection coil 32 are different,
The voltage corresponding to the difference is inputted to the signal amplification unit 46 via the voltage comparison circuit 42, and a rectified voltage is generated there, and the Schmitt circuit 48 is turned off and waits.□ Next, this Schmitt circuit 48 is a pulse generator 49.
The distribution is configured to operate the coil 14 via the DC amplification section 50 .

That is, when a genuine coin is inserted, the Schmitt circuit 48 is activated, and the pulse generated by this is DC amplified, and the distributed portion operates the coil 14. The blocked state is released and the inserted coin C falls into the genuine coin passage 12. Conversely, when a counterfeit coin is inserted, a rectified voltage is generated by the lightning 1 voltage comparison circuit 42. And Schmitt circuit 48
is turned off, so the coil 14 does not operate during the distribution,
The inserted counterfeit coins will be guided to the counterfeit coin passage 13 by the plate 15.In addition, in the above explanation, the material of the inserted coin C is different from that of the standard part 31. In this case, the induced voltages from the currency detection filter 22 and the reference detection coil 32 are different.
Even if the coin C is the same as the coin C in terms of material and has a significantly different shape, the rain detection coil 22.
Because the induced voltages of the coins are different, the coins may be determined to be counterfeit coins.

Furthermore, the dimensions of the passage hole 21 in the passage section 20 are as follows:
The cross-sectional area affects the filling rate of the winding, but in order to increase the accuracy of determining whether the coin C is genuine or false, it is desirable to improve this filling rate as much as possible0. Also, the oscillation frequency for excitation is - It is necessary to change depending on the type of sorted coin C. In other words, it is desirable to lower the frequency for materials with high magnetic permeability.

In addition, in the above explanation, since the reference part 30 and the passage part 20 were explained as one, for example, for the normal coin C, only 100 yen coins, or 10 yen coins are used. In this example, coins can be sorted, but by providing a plurality of reference parts 30 and passage parts 20, it is also possible to distinguish between a plurality of types of coins.

As explained above, the present invention does not perform any sorting of the external appearance of the coins, and only determines authenticity by selecting the material, so even if the coins are deformed or worn, they can be recognized as genuine coins. , there is no influence on the discrimination performance due to dust or dirt attached to the coins, and it not only has long-term stability, but also allows the authenticity or falsity of the inserted coin to be determined the moment it passes through the passage section. , which has significantly improved the original performance of the coin recognition machine, such as rich interlocking properties.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram, FIG. 2 is a sectional view of the passage section, FIG. 3 is a front view of the passage section, and FIG. 4 is for explaining the operation. Figure 5 is to show the difference between when genuine coins are inserted and when counterfeit coins are inserted.If genuine coins are inserted in the upper row,
The bottom row shows the case where fake coins are inserted, A is the signal amplification waveform,
The opening shows the commutation waveform, )\ shows the output from the Schmidt circuit, and the pulse from the /gus generation circuit.OC...Coin 10...Input port

Claims (1)

[Scope of Claims] 1. A reference part having a fixed reference part and a passing part through which coins to be discriminated pass are provided, and each of the reference part and the passing part is connected to an excitation coil, and the excitation coil generates an induced voltage. A detection coil is formed, and a voltage comparison circuit is provided for the induced voltage in the reference detection coil and the induced voltage in the passing detection coil, and the authenticity of the coin is determined based on the comparison result. Coin discrimination device with 2 voltage comparison circuit, induced voltage in the reference detection coil and
The coin discriminating device according to claim 1, wherein the induced voltage in the passage detection coil when a coin passes is formed to have an opposite phase. 3 The voltage comparator circuit is adjustable so that the induced voltage in the rain detection coil is in opposite phase.