JPS5860390A - Selection of coin - 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 detects the characteristics of a coin by capturing inductance and loss resistance caused by eddy current loss within the coin caused by placing the coin in an alternating magnetic field by frequency, phase change, and induced voltage change. A magnetic type coin testing method that detects the characteristics of a coin, or a capacitance type that detects the characteristics of a coin by capturing changes in capacitance caused by changes in dielectric constant or dimensions of a conductor caused by placing a coin between two electrodes. Measure the coin using the coin testing method,
The present invention relates to a coin sorting device that determines the suitability and denomination of coins.

A conventional coin sorting device has two coin testers, one for testing and one for reference, and a real coin is placed in advance for the reference, and when the number of coins to be tested has passed, the measurement results of both are compared. Many methods have been used to determine the suitability of this coin, or to use a variable resistor or variable capacitor as the reference condition to make the electrical conditions the same as the reference coin. Recently, however, semiconductor memories using semiconductor integrated circuits have been used as a substitute for these standard coins or corresponding adjustment parts, which can store information such as acceptance range information, tolerance range, and other measurement conditions for genuine coins. There is a method of comparing the coin inspection information and the above-mentioned reference value information to determine the authenticity of the inserted coin.

However, if the standard value information is used to distinguish between coins with significantly different information, it is possible to expand the acceptance tolerance range and there is no practical problem, but depending on the type of coin, the coin inspection information may be extremely similar. In addition, in the case where sophisticated counterfeit coins are inserted, the acceptance range must be as narrow as possible without significantly reducing the acceptance rate of genuine coins in order to distinguish them from other genuine coins or counterfeit coins. . In this case, not only the frequency of the alternating magnetic field, the voltage, the temperature, and the influence of external changes in various electrical elements in the measurement circuit, but also the inspection information from the coin inspection machine due to the stable transfer of coins are always kept under stable conditions. You see, the detour circuits, elements, and mechanisms were devised, making it expensive.

From this point of view, the present invention is capable of making an accurate judgment by following the variation even if there is a variation between the measurement conditions of the coin inspection device and the setting conditions when setting the reference value information, and furthermore, it is possible to make an appropriate judgment by following the change. The present invention provides a coin sorting device that can accurately judge the inspection information of a plurality of coins.

Hereinafter, one embodiment will be described in detail with reference to the drawings.

Figure 4 shows a schematic diagram of the coin sorting device (1). Coins inserted from the upper part of the coin sorting device (2) have an angular inclination of 100, which constitutes one side of the coin passageway e. Board A (2) on the other side and board B (2) on the other side on the rail located below.
9), the coin rolls through the coin passage αe, and passes through each part of the material sensor (4), plate thickness sensor (5), and diameter sensor (6) that are arranged in sequence, and the information of these multiple inspection devices is read in advance. If each item matches the predetermined reference value information, the control circuit (not shown) determines it as genuine currency, and the coin is sent to the acceptance gate (7).
) is configured to be sucked in and introduced into the specie passage (8).

Figure 2 shows the most effective plate thickness sensor (5) of the present invention.
FIG. The board thickness sensor is connected to the board (3) and board (9).
) A pot-shaped core A1 made of ferrite material is embedded in each wall of the core A1, and a coil I is wound inside the core A1.
It is composed of a core α and a coil 0 wound inside the core α, and its passage dimension A is set to have a slight margin for the maximum thickness of the coin used. In this configuration, the thickness of the inserted coin a is measured by the thickness TO of the recessed part in the approximate center of the coin, and this dimension is determined by the dimension B from the sensor on the board (9) side and the board. By measuring the dimension C from (3), the thickness T of the central part of the coin can be indirectly detected.

FIG. 3 shows the connection method of each coil a'aSa shown in FIG. 2 and its circuit configuration. In this circuit, only the board thickness inspection circuit is shown for the sake of explanation, and other inspection circuits are omitted. The coil (13) and the coil aυ are connected in series with opposite phases so as to mutually cancel out the generated magnetic fields so that the mutual inductance becomes negative, and enter the oscillation circuit a. In the series anti-phase connection, when the passage dimension A changes, for example when it becomes wider, the total inductance of the coil α3 and the coil aυ increases and the oscillation frequency decreases to compensate for the decrease due to the increase in the passage size. It is something that works.

The oscillator 11r (11 is configured to oscillate at an oscillation frequency determined by the built-in capacitor and coil (13) and the inductance obtained by the coil 0υ, and further shapes the oscillation waveform from a sine wave to a logic circuit level. The output of the 0 oscillation circuit α9, which has a built-in circuit, is input to the judgment calculation circuit 12B, which performs calculation and error correction calculation to be described later, and uses the information after the correction as information in the reference value information storage device. If the information is within the information range, it is output as a genuine coin output (2), and the genuine coin output is a signal indicating whether the coin belongs to one of a plurality of coins or a counterfeit coin as a result of the plate thickness sensor (5). It will be used as a signal.

As can be understood from such a configuration, in this embodiment, the oscillation frequency when there is no coin in one part of the sensor and the change in the oscillation frequency when a coin passes through the sensor part are detected, and the change in the oscillation frequency is detected to determine whether the coin is a genuine coin or a counterfeit coin. This is to determine the type of. Figure 4 is the third
This is intended to further clarify the reason why the present invention is necessary in a coin inspection method using oscillation frequency changes as shown in the figure.

The horizontal axis T represents the thickness of the central part of various inserted coins or equivalent counterfeit coins, etc., and the vertical axis represents the oscillation frequency, which is the peak of the oscillation circuit (2) in Figure 3. is the oscillation frequency when no coin is inserted, and is the standby frequency.

As described above, this standby frequency is determined by the coil-to-coil airflow αυ and the characteristics of the capacitor and oscillator inside the oscillation circuit member. T, L on the line, f,,
f is the standby frequency, f is the oscillation frequency when information is installed in the aforementioned reference value information storage device in a factory, etc., and f, , f, are all caused by external factors such as bot core α1 or It shows the state in which the standby oscillation frequency changes due to changes in the magnetic permeability of the ferrite etc. of a2, changes in the capacitance of the capacitor inside the oscillation circuit, changes in the passage dimension AQ4) due to temperature, etc. The relationship between f, , f, , f, is f, )'f in frequency. 〉fl, and f8c shows an increase in frequency f1 indicates a decrease in frequency. In this example, explanation 1 Akira! For ease of calculation, we set (f, -f,) = (f, -f,). Under these conditions, if the coin thickness T is varied, the change in the oscillation frequency will be as shown in the graph. For example, if a coin with a thickness of 2.0 - is inserted, the standby frequency will change according to each standby frequency. If is fo, then fo-1゜+f
For l, fr %-* -ft for 4T! ,. and the difference between each of them (ft'rt, *) - (taTt,
. ) becomes larger than (fa Tt-0) (flTt, @).

It can also be seen that the respective differences are larger than the respective differences in standby frequencies, that is, (f,)-(f,) and (f.)-(f,). Also, the same difference when inserting l and Qs crane coins also shows the same tendency (
c'rt,. ) - (f, %, .) T101 under the same conditions
The difference in oscillation frequency between the two parts is small. The reason for this is that the change in the standby oscillation frequency when a coin is inserted is a geometric change.
This shows that the thicker coin is closer to the sensor on the substrate (9) side, so the change in the coin M0 becomes larger, and the inductance change tends to increase exponentially.

For this reason, as previously proposed, there is a method for correcting parallel movement in which the fluctuation of the oscillation frequency during standby is adjusted from the oscillation frequency when coins are inserted, and a method for correcting the parallel movement is adjusted by the fluctuation of the oscillation frequency during standby. The method of correcting by multiplying by a correction coefficient is incomplete, and it is extremely difficult to set a narrow allowable error range in order to accept only genuine coins with high accuracy as described above.

In view of this point, the present invention has been designed to handle almost all of the values obtained from the input coins (for example, L Tt, *) in addition to the standby frequency during production at the factory and the standby frequency during use. Correction is performed entirely by calculation.

Fig. 5 shows its configuration. In order to detect the standby frequency (f, or f. or f,) of the sensor (5), the signal of the material - sensor < 4) is detected by the coin insertion detection circuit (5). When the input is detected, the signal is sent to the standby frequency acquisition circuit of the sensor (5), and the current value of the sensor (5) is temporarily stored. This value is calculated by calculating the deviation between the value in the standby frequency storage section (c) at the time of device production with reference value information set and the standby frequency fluctuation calculation circuit (5), and the value is sent to the correction circuit (to). It will be done. Next, the inserted coin reaches the plate thickness sensor (5), and when the peak value of the coin information is detected by the peak value detection circuit (a), the information is also transferred to the correction circuit (a).
sent to ). As already mentioned, the correction circuit (to) is a correction coefficient for the fluctuation of the standby value and one percentage due to the change in the peak value, and β is the correction coefficient for the unconstrained portion due to the difference in the thickness of the coin, etc. , the value of β depends on the sensitivity of the sensor, the size of the passage size,
This is a constant determined by the difference in thickness of multiple coins. The value calculated by the correction circuit (7) in this way is the reference value 0. Acceptable range information storage section (31) inside the information device (a)
It is compared with the value of and output as a specie or denomination output in (c).

The present invention, which has been described in detail above, stores in the memory, in addition to storing reference information, standby information when storing the reference information and coefficients for its correction. Correcting calculations based on two points due to differences in information 1 This method is related to a coin sorting device that determines the suitability of a coin by comparing it with standard information (with a wide acceptance range). It is possible to perform accurate judgment operations.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the coin sorting device, Fig. 2 is a sectional view of the plate thickness sensor, Fig. 3 is the control circuit, Fig. 4 is the plate thickness characteristics for coins, and FA5 is the control according to the present invention. Shows the circuit. (5)--Plate thickness sensor, coil, wire...
...Peak value detection circuit, (to)...Correction circuit. System 1 diagram Tin 2 yen book 5 items

Claims (1)

[Claims] 1. In a device that determines the authenticity of an inserted coin based on signal changes, the standby value of the sensor signal during production is used as the second signal, and the peak value at the time of coin insertion during use is used as the third signal. A coin sorting method characterized in that the coin is used as a signal, and the coin is calculated based on the first, second, and third signals when accepting the coin, and the authenticity is determined by determining whether it is within a predetermined acceptance setting range.