JPH0797429B2 - Electronic Sensitivity Automatic Sensitivity Adjustment Device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic money checking machine used in, for example, an automatic vending machine or an automatic ticket vending machine, and more particularly to an apparatus for automatically adjusting a money checking sensitivity.

2. Description of the Related Art Generally, in an electronic money checking machine used for an automatic vending machine or the like, the magnetic permeability of money is used to detect the outer shape, the material, and the like to determine the authenticity of the inserted money. However, since the sensitivity of the currency check is based on new currency, there is a drawback that the true currency recognition rate is lowered with respect to old currency worn out by long-term use. Further, the magnetic permeability of money is slightly different depending on the time when the money was manufactured, and therefore, there is a fear that the true currency recognition rate of the electronic coin-operated machine significantly decreases with the lapse of years of use.

To compensate for this drawback, as described in Japanese Patent Laid-Open No. 59-114695, "Automatic Sensitivity Adjustment Device for Electronic Money Checkers," the Obtain the percentage of the true coins that have a magnetic permeability value, and when that percentage reaches a specific value that is considered to occupy the majority of the total true coins, the constant permeability centered on the relevant permeability. In addition to the range of magnetic permeability that can be recognized as an initial true coin, by determining the range of magnetic permeability that can be newly recognized as a true coin, the difference in magnetic permeability depending on the frequency of use of old money and the manufacturing time of money. There has been proposed a device that detects the error and automatically adjusts the sensitivity of the public inspection.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the device as described above,
When genuine coins with a certain magnetic permeability are biasedly inserted,
There was a risk that the range of magnetic permeability that could be mistakenly recognized as a true coin was determined centering on the magnetic permeability, and that the true coin recognition rate subsequently deteriorated.

The present invention is to solve the above-mentioned problems, and even if a true coin having a specific magnetic permeability is biasedly inserted, it does not accidentally determine a magnetic permeability range that can be recognized as a true coin. The present invention provides an automatic adjustment device for the sensitivity of public inspection.

Means for Solving the Problems In order to solve the above problems, an automatic coin inspection sensitivity adjusting device for an electronic money checking machine according to the present invention includes a magnetic sensor for detecting the magnetic permeability of input coins, and a transparent sensor detected by the magnetic sensor. An A / D converter for converting magnetic susceptibility into a digital signal, and a discrimination means for discriminating whether or not the digital signalized magnetic permeability is within the magnetic permeability range that can be recognized as a true coin by the A / D converter. Further, a counter for counting the total number of true coins of the inserted money, and for each of a plurality of magnetic permeability values within a magnetic permeability range that can be recognized as a true coin, count the number of true coins having the magnetic permeability value. A plurality of counter groups, a divider that divides the count value of the plurality of counter groups by the total number of true coins, and when the total number of true coins reaches a certain value, the standard deviation and the average of the magnetic permeability. The calculator that calculates the value and the one that is closest to the average when the standard deviation reaches a value within a specific range In addition to a magnetic permeability range that can be recognized as an initial true coin, a constant magnetic permeability range centered on magnetic permeability, and a determination means that newly determines the magnetic permeability range that can be recognized as a true coin Is.

Action The present invention, by the above configuration, when the total number of true coins reaches a certain constant value, calculates the standard deviation and the average value of the magnetic permeability,
Only when the standard deviation reaches a value within a specific range, a constant magnetic permeability range centered on the magnetic permeability closest to the average value is added to the magnetic permeability range that can be recognized as an initial true coin, By newly determining the magnetic permeability range that can be recognized as a true coin, even if a true coin having a specific magnetic permeability is biasedly inserted,
The sensitivity of coin inspection is automatically adjusted without deciding the magnetic permeability range that can be mistakenly recognized as true coins, and the recognition rate of old coins is reduced. In addition to increasing the number of sales opportunities in vending machines and the like, it also eliminates the need for readjustment work of the magnetic permeability range that can be recognized as a true coin.

Example Hereinafter, an automatic coin-testing sensitivity adjusting device for an electronic coin-operating machine according to one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an automatic coin-checking sensitivity adjusting device for an electronic coin-operating machine according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a magnetic sensor, which detects the magnetic permeability of input coins and outputs an analog signal output 1a corresponding to the magnetic permeability. An A / D converter 2 converts the analog signal output 1a of the magnetic sensor 1 into a digital signal output 2a and outputs it.
3 is a discrimination means, which is a digital signal output 2 of the A / D converter 2
In response to a, it is determined whether or not it is within the magnetic permeability range that can be recognized as a true coin. If it is within the range that can be recognized as a true coin, the true coin signal 3a and the true coin count pulse 3b are output, and the magnetic permeability value X _m is used as the central value. Further, n (n is an arbitrary integer) magnetic permeability (that is, x ₁ , x ₂ , ..., x _m , ..., x _n-1 , x _n within the magnetic permeability range that can be recognized as a true coin. ) Of which the magnetic permeability value has been determined, and the corresponding true currency count pulse Si for each magnetic permeability value is output. Here Si _{is, s 1, s 2, ......} , s m, ......, shows the any one of the output of s _n-1, s _n.

If it is not within the range that can be recognized as a true coin, the counterfeit money signal 3c
Is output.

A coin storing mechanism 4 receives the true coin signal 3a from the discriminating means 3 and stores the inserted coin. Also, by the true coin signal 3a,
Vending machines perform sales operations, and ticket vending machines perform ticket sales operations. Reference numeral 5 is a money return mechanism, which receives the fake money signal 3c of the discrimination means 3 and returns the input money.

A total true coin number counter 6 receives the true coin count pulse 3b from the discriminating means 3, counts the total true coin number N _s , and outputs the count value. It also outputs a count-up signal 6a when the total number of true coins N _s reaches a certain value. Here, the certain constant value is a sufficiently large value for examining the distribution of magnetic permeability of old money and the distribution of magnetic permeability depending on the manufacturing time.

_{c 1, c 2, ......,} c m, ......, c n-1, c n is the permeability value by the true貨数counter group, permeability values by Ma貨counting pulses of the discriminating means 3
s ₁ , s ₂ , ......, s _m , ......, s _n-1 , s _n , and the corresponding number of true coins N ₁ , N ₂ , ......, N _m , ...... , N _n-1 and N _n are counted and the count value is output.

Reference numeral 7 denotes a divider, which receives the count-up signal 6a from the total true coin number counter 6 and sequentially receives the true coin number counters for each magnetic permeability value.
A calculation is performed by dividing the number of true coins by magnetic permeability value Ni from Ci by the total number of true coins Ns from the total true coin number counter 6, and the division result Qi (= Ni / N
s) is output to the average value calculator 8 and the standard deviation calculator 9.
Here, i represents any one of 1, 2, ..., M, ..., N−1, n. The average value calculator 8 receives the division result Qi from the divider 7, calculates the average value by the following equation (1), and calculates the calculation result by the standard deviation calculator 9 and the determining means 10.
Output to.

The standard deviation calculator 9 is a division result from the divider 7.
Upon receiving Qi and the average value from the average value calculator 8, the standard deviation σ is calculated by the following equation (2), and the calculation result is output to the determining means 10.

The determining means 10 receives the average value from the average value calculator 8 and the standard deviation σ from the standard deviation calculator 9,
Only when the standard deviation σ reaches a value within a specific range, which corresponds to a distribution that is considered to be justified, of the permeability of old money and the permeability that changes depending on the manufacturing time, the permeability closest to the average value is determined. In addition to the magnetic permeability range that can be recognized as an initial true coin, the constant magnetic permeability range around the center is newly determined, and the magnetic permeability range that can be recognized as a true coin is newly determined, and the determination signal 10a is output, and the determination is made. It serves to control the means 3.

The operation of the automatic coin inspection sensitivity adjusting device for the electronic coin-operated commerce configured as described above will be described below with reference to FIGS. 2 and 3.

First, as shown by the solid line A in Fig. 2, the magnetic permeability of new coins produced at a certain point is distributed in the range from x _{1 to} x _n with the magnetic permeability value x _m as the center. Is a normal distribution. Therefore, in the electronic money checking machine shown in the present embodiment, the magnetic permeability range x ₁ to x _n is set as the magnetic permeability range that can be initially coined.

Next, the permeability of old coins that have been worn due to long-term use is
For example, it changes as shown by the one-dot chain line B in FIG. At this time, the distribution width is almost constant.

Further, when the number of years has passed, the same changes due to the difference in manufacturing time.

Therefore, in order to detect the change in the magnetic permeability of old money and the change in the magnetic permeability due to the manufacturing time, this device operates as follows, as shown in FIG.

Here, the total true coin number counter 6 counts and stores the total true coin number Ns of the inserted coins so far, and the magnetic currency value-specific true coin number counter groups c ₁ , c ₂ ,. , c _m , ..., c _n-1 , c _n are the number of true coins N ₁ , N ₂ , ..., N _m , ......, N _n-1 , N _n It is assumed that

When money is thrown into the electronic money checker (step 1), the magnetic sensor 1 outputs an analog signal 1a corresponding to magnetic permeability, and the A / D converter 2 converts it into a digital signal 2a (ste.
p2). If the input coin is a false coin (step 3), the discriminating means 3 outputs a false coin signal 3c, and the coin returning mechanism 5 returns the input coin (step 4).

When the inserted coin is a true coin (step 5), the discriminating means 3 outputs a true coin signal 3a, and the inserted coin is stored by the coin storing mechanism (step 6). And true coin count pulse 3b
Then, the total true coin number counter 6 counts the total true coin number Ns (step 7). Further, if the permeability value of the input money is x _m-1 shown in FIG. 2, for example, a corresponding true-value-specific currency count pulse s _m-1 is issued, and the corresponding true-value-specific true value is calculated. The coin count c _m-1 counts up the true coin count N _m-1 for each magnetic permeability value (step 8).

Next, when the number of true coins Ns reaches a certain value (step
9), the total true coin number counter 6 outputs a count-up signal 6a (step 10). Here, the certain constant value is a sufficiently large value for examining the distribution of magnetic permeability of old money and the distribution of magnetic permeability depending on the manufacturing time. Next, the divider 8 receives the count-up signal 6a and subsequently performs division (step 1
1) Output division result Qi (= Ni / Ns). Then, the average value calculator 8 calculates the average value according to the equation (1) (step 12) and outputs the average value. Then, the standard deviation calculator 9 calculates the standard deviation σ according to the equation (2) (step 13) and outputs the standard deviation σ. Next, the determining means 10 receives the average value and the standard deviation σ, and then the standard deviation σ
, When reaching a value within a certain range, which corresponds to a distribution that is considered to be justified, of the permeability of old money and the permeability that changes depending on the manufacturing time (step 14), the permeability closest to the average value The constant magnetic permeability range is added to the magnetic permeability range that can be recognized as an initial true coin, and a new magnetic permeability range that can be recognized as a true coin is newly determined, and a determination signal 10a is output to determine the discriminating means 3. Control (step15). Then, the determining means 10 outputs a clear signal 10b, and the total true coin number counter 6 and the true coin number counter group by magnetic permeability value c ₁ , c ₂ , ..., _cm ,. all the _n-1, c _n is cleared (step16), total true貨数counter 6 and the magnetic permeability values by Shin貨数counter _{c 1, c 2, ......,} c m, ......, c n-1 , c _n newly starts counting.

According to the automatic coin inspection sensitivity automatic adjustment device of the electronic coin checker shown in the above-mentioned embodiment, the magnetic sensor 1 for detecting the magnetic permeability of the inserted coin.
And an A / D converter 2 for converting the magnetic permeability detected by the magnetic sensor 1 into a digital signal, and a magnetic permeability range in which the digitalized magnetic permeability can be recognized as a true coin by the electric A / D converter 2. And a counter 6 for counting the total number of true coins inserted, and a plurality of magnetic permeability values within a magnetic permeability range that can be recognized as true coins. , A plurality of counter groups c ₁ and c for counting the number of true coins having the magnetic permeability value.
₂ , ..., C _m , ..., C _n-1 , C _n, and the plurality of counter groups c ₁ , c ₂ ,
......, c _m, ......, a divider 7 for dividing the count value of c _n-1, c _n a total true貨数total true貨数is, when reaching a certain value, the magnetic permeability An average value calculator 8 for calculating an average value, a standard deviation calculator 9 for calculating a standard deviation of magnetic permeability, and a magnetic permeability that is closest to the average value when the standard deviation reaches a specific range. In addition to the constant magnetic permeability range that can be recognized as an initial true coin, a determination unit 10 that newly determines the magnetic permeability range that can be recognized as a true coin is provided. , When the total number of true coins reaches a certain value, the standard deviation and average value of magnetic permeability are calculated, and the standard deviation is closest to the average value only when the standard deviation reaches a value within a specific range. A certain magnetic permeability range centered on magnetic permeability is added to the magnetic permeability range that can be recognized as an initial true coin, and a new magnetic permeability range that can be recognized as a true coin can be determined. Even if genuine coins with a certain magnetic permeability are biasedly inserted, the sensitivity of coin inspection is automatically adjusted without deciding the magnetic permeability range that can be mistakenly recognized as true coins, and the true coin recognition of old coins is recognized. It is based on the permeability range that can be recognized as preset true coins and the permeability of coins that have been inserted, while preventing the decline in the rate and the decline in the true coin recognition rate due to the number of years of use of the electronic money checker. The true and false judgments are made together with the magnetic permeability range that can be recognized as true coins, which increases the sales opportunities in vending machines and the like, improves sales efficiency, and the magnetic permeability range that can be recognized as true coins. Since the readjustment work of (1) is unnecessary, the labor and time required for the maintenance of the electronic money checking machine can be significantly reduced.

Further, as described above, a plurality of true coin number counters c ₁ , c ₂ , ..., c _m , ......, c _n-1 ,
c _n is provided and the number of true coins for each magnetic permeability value is divided by the total number of true coins using the divider 7 to calculate the average value and the standard deviation, and the magnetic permeability value for each coin inserted. The configuration is remarkably simpler than the method of storing, and even when this device is configured by using a microcomputer, the memory capacity is saved and the arithmetic processing algorithm is simplified. The calculation speed can be improved by.

Further, by using the equation (3) shown below with the equation (2) of the standard deviation σ assuming that the total number of true coins Ns is sufficiently large, it is possible to further simplify the arithmetic processing algorithm and reduce the operation speed. It can be improved.

Effects of the Invention As described above, the present invention is a magnetic sensor for detecting the magnetic permeability of input coins, an A / D converter for converting the magnetic permeability detected by the magnetic sensor into a digital signal, and the A / D converter.
The converter has a discriminating means for discriminating whether or not the digitalized magnetic permeability is within the magnetic permeability range that can be recognized as a true coin, and further, a counter for counting the total true coins of the inserted coins, , For each of a plurality of magnetic permeability values within a magnetic permeability range that can be recognized as a true coin, a plurality of counter groups that count the number of true coins having the magnetic permeability value, and a total of the count values of the plurality of counter groups. A divider that divides by the number of true coins, an operator that calculates the standard deviation and average value of magnetic permeability when the total number of true coins reaches a certain value, and a standard deviation within a specific range When it reaches, a constant magnetic permeability range centered on the magnetic permeability that is closest to the average value is added to the magnetic permeability range that can be recognized as an initial true coin, and a new magnetic permeability range that can be newly recognized as a true coin. When the total number of true coins reaches a certain value, the standard deviation and average value of the magnetic permeability are calculated. However, a constant magnetic permeability range centered on the magnetic permeability that is closest to the average value only when the standard deviation reaches a value within a specific range is added to the magnetic permeability range that can be recognized as an initial true coin. , By newly determining the magnetic permeability range that can be recognized as a true coin, even if a true coin having a specific magnetic permeability is biasedly inserted, the magnetic permeability range that can be mistakenly recognized as a true coin is determined. In addition, the sensitivity of coin inspection is automatically adjusted to prevent a decrease in the true coin recognition rate for old coins and a decrease in the true coin recognition rate due to the number of years of use of an electronic coin-operated machine, and it can be recognized as a preset true coin. Since the true / false judgment is made by combining the magnetic permeability range and the magnetic permeability range that can be recognized as a true coin based on the magnetic permeability of the inserted coins, the sales opportunity is increased in vending machines, etc., and the sales efficiency is increased. And the readjustment work of the magnetic permeability range that can be recognized as a true coin. In addition to significantly reducing the time and effort required for the maintenance of the electronic money-changing machine, the true coin count for each permeability value is divided by the total true coin count to calculate the average value and standard deviation. As compared with the method of storing the magnetic permeability value for each coin inserted, the configuration is remarkably simplified and the present apparatus can be realized at low cost.

[Brief description of drawings]

FIG. 1 is a block diagram of an automatic money-checking sensitivity adjusting device for an electronic money checking machine showing an embodiment of the present invention, FIG. 2 is a distribution diagram of magnetic permeability of money, and FIG. 3 is an embodiment of the present invention. 6 is a flowchart showing the operation. 1 ... Magnetic sensor, 2 ... A / D converter, 3 ... Discrimination means, 4 ... Currency storage mechanism, 5 ... Currency return mechanism, 6 ...
The total true貨数 _{counter, c 1, c 2, c} m, c n-1, c n ...... permeability values by Shin貨数counter, 7 ...... divider, 8 ...... average value calculator, 9 ......
Standard deviation calculator, 10 ... Determination means.

Claims (1)

[Claims] 1. A magnetic sensor for detecting the magnetic permeability of input coins, an A / D converter for converting the magnetic permeability detected by the magnetic sensor into a digital signal, and a digital signal by the A / D converter. Having a discriminating means for discriminating whether or not the magnetic permeability is within the range of magnetic permeability which can be recognized as a true coin, and further, a counter for counting the total number of true coins of the input money, and a transparent device which can be recognized as a true coin. For each of a plurality of magnetic permeability values in the magnetic susceptibility range, a plurality of counter groups that count the number of true coins having the magnetic permeability value, and a divider that divides the count value of the plurality of counter groups by the total number of true coins And, when the total number of true coins reaches a certain value, a calculator that calculates the standard deviation and average value of the magnetic permeability, and the average value when the standard deviation reaches a value within a specific range. A certain range of magnetic permeability centered on the closest magnetic permeability is added to the range of magnetic permeability that can be recognized as an initial true coin. , The coin detecting sensitivity automatic adjuster electronic test Qian machine having a determining means for determining a permeability range that can be recognized as true coins.