JPS59168589A - 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 for discriminating the type and authenticity of coins.

In recent years, various coin discrimination devices that use electromagnetic induction to discriminate the type and authenticity of coins have been developed and used. However, conventional devices of this type are limited to ■ Each type of coin (
The difference between the detection signals corresponding to each of these coins is small, so it is difficult to distinguish between them. ■It is necessary to provide a discriminating section for each coin to be discriminated, which makes the device complicated and expensive. In the case where the discrimination coils are arranged on both sides of the coin, it is troublesome to adjust the gap between the coils, and coins tend to jam.

This invention was designed to eliminate the above-mentioned drawbacks.
Its purpose is to make it easy to distinguish between authenticity and falsehood, and to
It is an object of the present invention to provide a coin discriminating device which has a simple structure even when coins are jammed.

An embodiment of the present invention will be described below with reference to rotation. FIG. 1 is a block diagram showing the configuration of a coin discriminating device according to the present invention. ).Material detection circuit A (here, 1 is an oscillator that supplies a constant frequency output. 2 is a bridge circuit for detection with a loss value: −, a coil with equal inductance fm) It consists of coils I, L, L2 and loss comparison coils L3 and L4 with equal inductance, and is connected to the input terminal PI from the excavator 1.

Give this input to P21. 3 is a differential amplifier which is connected to the output terminal P3.3 of the bridge circuit 2. It receives input from P4 and amplifies the potential difference of the input signal. Here, the specific structure of the coils L3 and L4 will be explained based on FIGS. 2 and 3. First, the coil L3 is wound around the center leg of the E-shaped iron core 5 as shown in FIG. This aluminum plate 7 was selected as the one with the closest amount of loss to the coil in comparison with the 10 yen coin, which has the highest conductivity. As shown in the figure, it is attached to the E-shaped iron core 8, and the coin guide path 9 (
The coin to be detected 10 passing along this direction is configured to face the magnetic wall surface of the iron core 8 .

However, care must be taken to ensure that the coils L1 to L4 do not have a magnetic influence on each other.In the zero-order outer diameter detection circuit B, 11 is an oscillator. Reference numeral 12 denotes a sensor coil group, which is composed of sensor coils 12a, 12b, and 12c.The sensor coil 12a is connected to the output terminal of the oscillation 511, and the sensor coils 12b' and 12C are connected in the same direction from a common terminal (ground side terminal). The voltage applied to the sensor coil 12a induces a voltage in the sensor coils 12b and 12c based on the electromagnetic induction effect. 13 is a differential amplifier, and a voltage is applied to the input side of the sensor coil 12a. The anti-ground t(l output terminals of the sensor coils 12b and 12C are redirected. Here, the specific configuration of the sensor coil group 12 is shown in FIGS. 4 and 5. FIG. 4 is a front view. Figures 5 and 5 show cross-sectional views, and in each figure,
A holder 15 fixes two cores 16 and 17, and usually also fixes a frame 18 surrounding the outer periphery including the cores 16 and 17. Sensor coils 12c, 12b, and 12a constituting the sensor coil group 12 are installed around the cores 16 and 17 and the frame body 18, respectively.
,ru.

In addition to this, the distance d between the outermost ends of both cores 16 and 17 is set to be t smaller than the smallest diameter of the coins to be discriminated. FIG. 6 shows how the sensor coil #12 shown in FIGS. 4 and 5 is attached to the coin guide path 9 to be determined, and the guide supporting the coin to be determined 10 in the inner path 9 of the coin guide The surface 9a is arranged at a position extending from the lowest part of the core 16 located in the lower part of the ship.

Note that the above-mentioned coil L4 and the sensor coil group 1
2 are arranged in the order of L4 and 12 in the coin guide path 9, therefore, the coin to be discriminated first passes through the coil L4 and then passes through the sensor coil group 12.

Further, the coil L4 and the sensor coil group 12 are arranged so that magnetic induction does not occur with respect to each other.

Next, the output signals 81yS2 of the differential amplifiers 3.13 of the detection circuits A and B are respectively supplied to the input terminals of the multiplexer 20. The multiplexer 20 is the discrimination/control circuit 2
When the "1" signal is supplied from 6, the output signal 81 of the differential amplifier 3 is supplied to the rectifier/smoothing circuit 21.
“When the signal is supplied, the output signal of the differential amplifier 13 is 8.
is supplied to the rectification/smoothing circuit 21. Rectification/smoothing circuit 21
is supplied via the multiplexer 20, rectifies and smoothes the signal S, or S2, and outputs it as the signal S3 to the comparator 2.
2 input terminal A. The ROM (IJ-only memory) 23 is a memory in which a large number of reference values for coin discrimination are stored in advance, and each reference value is an address signal supplied from the discrimination circuit 26. 1. Read based on AD. It is converted into an analog signal by a D/A (digital/analog) converter 24 and supplied to input terminal B of the comparator 22. The comparator 22 compares the 1 signal supplied to its input terminal A with the 1 signal supplied to its input terminal B. If A≧Bo), it outputs a ``1'' signal, and if A<B, it outputs a ``1'' signal. outputs a '0'' signal to the discrimination/control circuit 26, respectively. The discrimination/control circuit 26 controls the multiplexer 205 and discriminates the authenticity and type (in the case of genuine coins) of the coin based on the output of the comparator 22.
If the coin is a genuine coin, a signal indicating the type of coin is output, and if the coin is a fake coin, a signal indicating the coin (it number) is output.The details will be described later.

Next, the above? iV) Operation of this device (The trick will be explained. First, the operation of the material detection circuit A will be explained.

It is assumed that the multiplexer 20 is supplied with the "1# signal" from the discrimination/control circuit 26.

First, when the inserted coin 10 has not reached the coil L4, the voltage across the coil L3 becomes low level due to the eddy current flowing through the aluminum plate 7, while the voltage across the coil L4 is low. Since it is not in front of coil L4, the level is high, and as a result, the rectifier/smoothing circuit 2
1 output signal S3 has the maximum level. Next (ko, coin 1
0 is coil L4.If you get close, the same coin 10i is coil L.
An eddy current of 4+ begins to flow, and the voltage across the coil L4 gradually decreases, so that the signal S
The level of , gradually [falls]. Then, when the center of the coin 10 is delayed (just before the coil L4) (see Figure 3),
The level of the signal S becomes the minimum, and thereafter, as the coin 10 passes, the level of the signal S increases again.

Here, the minimum level of the signal S3 differs depending on the material of the coin 10, and therefore, it is possible to determine the type and authenticity of the coin 10 based on the minimum level of the signal S3.

Next, the operation of the outer diameter detection circuit B will be explained. It is assumed that the multiplexer wO'' is supplied to the multiplexer 20 from the discrimination/control circuit 26. First, the coin 10 has not reached the sensor coil p12i (here, the sensor coil 12b, 12c becomes the same, so the output signal S of the differential amplifier 13 and the rectification/
Both output signals S3 of the smoothing circuit 21 become O. Next, when the coin 10 approaches the sensor coil group 12i, the coin 10
) Based on the sensor coils 12b and 12c (eddy currents flow), where the distance d between the cores 16 and 17 (Fig. 5)
is smaller than the diameter of the smallest coin (50 yen coin),
In addition, the coin guide surface 9a (fi4 (Figure 9) is I of the core 16
Regardless of the size of the coin, the eddy current caused by the sensor coil 17 is stronger than the eddy current caused by the sensor coil 16. Therefore, both ends of the sensor coil 17 - The voltage becomes smaller than the voltage across the sensor coil 16, and as a result, the level of the output signal S2 of the differential amplifier 13 increases, and the level of No. 100 S increases.

The center of the coin 10 is the sensor coil 12b.

The level of the signal S reaches its maximum when it faces the line connecting the center of the coin 12C, and after that, the level of the signal S3 decreases again as the coin 10 passes, and when the coin 10 passes completely, the signal S3 reaches its maximum level.
level becomes O. Here, signal S.

The maximum value of the level of is different depending on the outer diameter of the coin (therefore, based on the maximum value of the level of signal S3, the coin 10
It is possible to determine the type and authenticity of

Next, reference values stored in the ROM 23 will be explained. Now, for example, a standard 10 yen coin.

R1 is the minimum level of the signal 83 when a 500 yen coin, a 100 yen coin, and a 50 yen coin each pass in front of the coil L4.
, 几3. 3. Assuming that "a'(几、く几、〈R、<R、), As shown in FIG.
Setting r4m 0 Similarly, the standard 50 yen, 100 yen,
The maximum level of the signal 83 when a 10 yen coin and a 500 yen coin each pass in front of the sensor coil group 12 is T, ・Tt ・
If T3 and T4 (TI<T, <T3<T, ), then the upper and lower levels of level T, ~T4 (each upper limit value job"")
``' I4b and lower limit values tl+ to t4. are set. These upper limit values and lower limit values are each stored in advance in the ROM 23 as reference values (digital data).

Next, the operation of the entire apparatus shown in FIG. 1 will be explained.

First, when the coin 10 is inserted, the discrimination/control circuit 26 outputs a "1" signal to the multiplexer 20, and also outputs a "1" signal to the multiplexer 20.
M, 23 outputs address No. 16 AD specifying level t4b' (FIG. 7). As a result, No. 11 S is supplied to the rectifying/smoothing circuit 21. Further, digital data corresponding to level r4b is read from the ROM 23.
1, D/ is converted into an analog signal by the converter 24 and supplied to the input terminal B of the comparator 22. Here, before the coin 10 reaches the coil L4, as described above, the signal S3 is at the maximum level, so the comparator 22 outputs the "1# signal. Then, the coin 1
0 approaches the coil L4, the level of the signal S3 gradually decreases, as shown by the curve f in FIG.

Then, when the level of the signal S8 becomes equal to or lower than levels r and b, the output of the comparator 22 becomes a '0' signal.The discrimination/control circuit 26 detects this '0' signal and sends an address signal specifying the level r411. The number of people is output to 几0M23.This address signal AD causes the level r4 to be output from R, OM23.
The digital data corresponding to f''1.
From f, the output of the comparator 22 changes again by #1'' times 9.Next, when the level of the signal S3 further decreases and becomes below the level r'4□, the output of the comparator 22 is ``0''
It becomes a signal. This °0'' signal is detected by the discrimination/control circuit 26 (nl), and from this f'7.1, the level rsb f is supplied to the ROM 23, and the address data AD specifying f is supplied nl.
5. From then on, the above operation is repeated. After the discrimination/control circuit 26 outputs address data A, D, and H specifying the level 'taf, for example, it outputs r, r, and b alternately, and r! , and r7b (after detecting that the signal S3 has been present for a certain period of time or more, it detects that it has become higher than r2b, and furthermore (this signal S3 has finally become higher than, for example, r, b). From this ζ, it is detected that the minimum level of the signal S is between levels r, and r,b, and based on this detection result, it is determined that the coin 1o is a 500 yen coin.Similarly. For example, if the minimum level of the signal S is between levels r3m, r,), the coin 10 is determined to be a 100 yen coin, and the level r
ib and r2. If there is one between L, it is determined that it is a fake (change of money).

Next, when the coin 10 completely passes through the coil L4, the discrimination/control circuit 26 outputs a 0 signal to the multiplexer 2o, and also outputs a level signal to the ROM 23.

It outputs an address signal AD specifying tl. This,
As a result, the signal S is supplied to the rectifying/smoothing circuit 21, and the level t1. is supplied to ratio M022. here,
Before the coin 10 reaches the sensor coil group 12, the signal S,
is 0, so the comparator 22 outputs the wOr signal. Next, when the coin 10 approaches the sensor coil group 12, the level of the signal S3 gradually increases, and the level of the signal S3 increases to the level t1. When it becomes larger, the output of the comparator 22 becomes a "1" signal. Discrimination/control circuit 2
6 detects this "1" signal and outputs address data AD specifying the level ttb to the ROM 23. Thereafter, the maximum level of the signal S is determined n7 in the same way as in the case described above, and the type and authenticity of the coin 10 are determined based on this determination result. The discrimination/control circuit 26 receives the output signal 8. of the material detection circuit. Discrimination result based on and output signal of outer diameter detection circuit B8. [Based on this, about three judgments are made in total to determine the type and authenticity of the coin 10, and a signal corresponding to the judgment result is output.

In the above-mentioned embodiment, the bridge circuit 2 is made up of four coils L1 to L4 (thus, <t>), but two resistors having the same resistance value may be used instead of the coils L1 and L2. In addition, sensor coils 12b, 12C7, i
As explained above, the arrangement of the cores 16 and 17 to be attached to each Z is such that the maximum distance d between the cores 16 and 17 is smaller than the minimum diameter of the coin to be discriminated, and a hard guide is placed on the extension line of the lowest part of the core 16. It can be said that the best condition is to rub the surface 9a so that the surface 9a is evenly rubbed. Even if the distance of the core from the outer periphery of the coin to be discriminated is always constant, and the distance of the other core from the outer periphery of the coin to be discriminated is different (if it is arranged in a substantially non-perpendicular direction from the coin guide surface 9a). Even a slight displacement can be put to practical use with almost no effect on diameter discrimination.

As stated above, this invention uses a bridge circuit and a differential amplifier (thereby to create a detection signal for coin discrimination), so each coin's seed egg (corresponding to It is possible to increase the level difference of the detection No. 18, so coin discrimination can be performed easily (and accurately).In addition, a conductive metal plate (for example, an aluminum plate) can be used to place the coin to be discriminated. Since I selected a material that approximates the one with the largest eddy current loss among them, I calculated the median value of each eddy current loss of the 62 types of coins to be determined to be the one to which the eddy current loss of the above conductive metal plate probably belongs. There is no ., and coin discrimination can be performed without error.Furthermore, there is no need to provide a discrimination plane wave every ↑11pi of the coin to be discriminated, so the device can be made simple and inexpensive. Since the coin to be discriminated has a coil on only one side of the coin, it is possible to pass the coin to be discriminated through the coil (inside the coil) as in the past,
This arrangement eliminates the need for 51J work such as adjusting the gap and prevents coin jams.Furthermore, a material detection means and an outer diameter detection means are respectively provided. Since coin discrimination is performed based on the output of the coin, it is more accurate than the conventional coin discrimination based on the material or the outer diameter. There are several possible benefits to be gained.

[Brief explanation of the drawing]

FIG. 41 is a block diagram showing the configuration of an embodiment of the present invention;
882 and 3 are views showing the configuration of coils L3 and L4 in the same embodiment, respectively, and FIGS. 4 and 5 are a front view and side view showing the structure of the sensor coil group 12 in the same embodiment, respectively. A sectional view, FIG. 6 is a sectional view showing the relationship between the sensor coil/#12 and the coin guide path 9, and FIG. 7 is a diagram for explaining the coin discrimination method. 1... Oscillator, 2...Bridge circuit, 3.
... Differential amplifier, L1 to L4 ... Coil, 7...
・・Aluminum plate, 10 ・・Coin to be determined, 11−・・・・
Hatateyi, 12b. 12c...Sensor coil, 13...E> f
, b amplifier, 20... multiplexer, 21 ・
... Rectifier/smoothing circuit, 22... Comparator, 26...
・Discrimination/reduction circuit, A...Goods detection circuit, B...
Outer diameter detection circuit. Applicant Shinko Steel Co., Ltd.

Claims (1)

[Claims] (a) Two resistors or two coils having the same resistance or inductance are connected to one of the two input terminals, and the same inductance for detecting eddy current loss is connected to the other. A bridge circuit is purchased by connecting two coils having the same structure, and an oscillator is connected to the input side of the bridge circuit. The output side of is connected to the input end of the differential amplifier, and one side of the vortex current detection coil is opposed to the coin to be discriminated.
On the other hand (of the coins to be discriminated, this one most closely approximates the coin of Uzu's Flowing Loss Dog). At the discrimination position, two coils that give a vortex flow to the coin to be discriminated are set such that the shortest distance from the position of the coin to be discriminated facing the center of each coil to the outer circumference of the coin to be discriminated is Regardless of the diameter of the coin (f), the other coil is arranged so that it changes according to the diameter (f) of the coin to be discriminated, each coil is excited by a common oscillator, and the differential voltage of each coil is detected by a differential amplifier ( (C) selection means for selecting and outputting one of the outputs of the differential amplifiers of the material detection means and the outer diameter detection means; (d) ) a rectifying and smoothing means for rectifying and smoothing the output of the selecting means; and (e) a determining means for determining the type and authenticity of the coin based on the output level of the rectifying and smoothing means. Device.