JPH04162191A - Automatic adjustment device for identification sensitivity for paper money identifier - Google Patents

Abstract

PURPOSE:To prevent the deterioration of a real paper money recognition rate by dividing the number of real paper moneys by the total number of new paper moneys for respective transmissivities, newly setting the transmissivity concerned as a center and deciding a transmissivity range where the paper moneys are recognized to be real when a divided value reaches a specified value in the identification of the real paper moneys by means of the transmission factor of light. CONSTITUTION:A discrimination means 3 receives a transmissivity digital signal 2a for the inputted paper money and discriminates whether it is within the transmissivity range where the real paper moneys can be recognized as real or not. When they are recognized to be real, a real paper money signal 3a, a real paper money count pulse 3b and a real paper money count pulse by individual transmissivity rate S are outputted. A total paper money number counter 6 outputs a signal 6a when the total number of the real paper moneys reaches a prescribed number. A control means 8 receives the signal 6a and outputs a division instruction signal 8a to a divider 7. The divider 7 receives the signal 8a and divides respective count values C by the total number of the real paper moneys. When a divided result reaches the specified value, the transmissivity value as against the divided result is set to be the center and the transmissivity range of the recognition of the real paper money is decided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a banknote recognition machine used in, for example, a vending machine or a money changer, and particularly to an automatic recognition sensitivity adjustment device thereof.

BACKGROUND OF THE INVENTION Generally, in a banknote validating machine, the dimensions of the banknote to be identified,
The authenticity of the inserted banknotes is determined by detecting the thickness and density of printing ink. As an example,
As described in Japanese Patent No. 716, a method is disclosed in which the density of printing ink is detected by an optical sensor, compared with a reference value, and authenticity is determined based on whether the density is within an allowable error range.

Problems to be Solved by the Invention However, the density of printing ink differs slightly depending on when the banknote was manufactured, and changes quickly with use. Yes, there are differences.

Therefore, in conventional banknote validating machines, the rate of genuine banknote recognition decreases significantly over the years of use.

In addition, there were some machines that made it possible to adjust the transmittance range that could be recognized as a genuine note, that is, the recognition sensitivity, and readjust the transmittance range once every few years, but by this time, banknote validators were already widely distributed in the market. Therefore, readjustment work was very time-consuming and labor-intensive.

The present invention solves the above-mentioned problems. By automatically adjusting the recognition sensitivity of a banknote validating machine, the present invention prevents a decline in the genuine note recognition rate due to the number of years of use of each type of banknote, and also An object of the present invention is to provide an automatic recognition sensitivity adjustment device for a banknote validator that eliminates the need for readjustment of the rate range.

Means for Solving the Problems In order to solve the above problems, an automatic recognition sensitivity adjustment device for a banknote validating machine according to the present invention includes an optical sensor that detects the light transmittance of the printed part of the input banknote, and a An A/D converter that converts the detected transmittance into a digital signal, and whether the transmittance converted into a digital signal by the A/D converter is within a transmittance range that can be recognized as a genuine note. a counter for counting the total number of genuine notes in the inserted banknotes, and a counter for counting the total number of genuine notes having the permeability value for each of the plurality of permeability values within the permeability range that can be recognized as genuine notes. A plurality of counter groups for counting, a divider for dividing the counted value of the plurality of counter groups by the total number of genuine notes, and when the divided value by the rrrJ divider reaches a specific value, The present invention is equipped with a control means for determining a transmittance range that can be recognized as a genuine note, centering on the transmittance.

Effects The present invention has the above-described configuration, and a counter that counts the number of genuine bills having the transmittance for each of a plurality of transmittance values within the light transmittance range that can be recognized as genuine bills among the inserted banknotes. Then, calculate the ratio of the number of genuine notes with individual transmittance values to the total number of genuine notes in the input banknotes, and consider that this ratio accounts for the majority of the total number of genuine notes. By determining the transmittance range that can be recognized as a genuine note using the transmittance as a new center when the transmittance reaches a specific value, it is possible to detect differences in the shading of printing ink on banknotes depending on the time of manufacture. , which automatically adjusts the identification sensitivity.

EXAMPLE Hereinafter, an automatic recognition sensitivity adjustment device for a banknote validator according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an automatic recognition sensitivity adjustment device for a banknote validator according to an embodiment of the present invention.

In the figure, reference numeral 1 is an optical sensor that detects the light transmittance of the printed part of the inserted banknote through a light emitting part and a light receiving part (not shown in the figure), and sends an analog signal corresponding to the transmittance. Output 1
Give out a. 2 is an A/D converter which converts the analog signal output 1a of the optical sensor 1 into a digital signal output 2a and outputs the digital signal output 2a. Reference numeral 3 denotes a determining means which receives the digital signal output 2a of the A/D converter 2 and determines whether or not the transmittance is within a transmittance range that can be recognized as a genuine note. If the value is within the range that can be recognized as a genuine note, the genuine note signal 3a and the genuine note count pulse 3b are output, and the transmittance value xm is the central value, and the transmittance value is within the range that can be recognized as a genuine note. 2α+1 piece (
α is any integer) transmittance value (i.e. X.-months,...
..., "m-2+x knee,".

"m,"m+1 r"m+2,...l
"m-44)", which transmittance value it has is determined, and the corresponding genuine bill count parnu (Si) by transmittance value is output. Here, Si is 5rQ-ke,
......S! In-2゜Sm-1”m+ Sm+
1 + Sm+2 and """""m+d.

In addition, if the note is not within the range that can be recognized as a genuine note, the counterfeit note signal 3
Output C. Reference numeral 4 denotes a banknote storage mechanism which receives the genuine banknote signal 3a from the discriminating means 3 and stores the inserted banknotes. In addition, the genuine bill signal 3a is used to perform sales operations in automatic vending machines, exchange operations in currency exchange machines, and the like. 5 is a banknote return mechanism,
Upon receiving the counterfeit bill signal 3C from the discriminating means 3, the inserted bill is returned.

Reference numeral 6 denotes a total number of genuine bills counter, which receives the genuine bill count parnu 3b of the discriminating means 3, counts the total number of genuine bills Ng, and outputs the counted value. It also outputs a count-up signal 6.

Cm-, -...-, Cm-2, C-=, Cm, C-,
.

Cm+21..., Cm+ is a group of counters for the number of genuine notes by transmittance value, and genuine bill count pulses S by transmittance value of the discriminating means 3...+8m-2,... ...
TSm-1゜m-α 夛Snl Sm+1+ Sm+2+...' sm
+, and the number of genuine notes N for each corresponding transmittance value. -7,...

N N NN ......, N
TX1+Yu count m-2-m-1+ me m
Perform +2+ and output the counted value.

7 is a divider which receives a division command signal 8a from the control means 8 and sequentially converts the number Ni of genuine bills by transmittance value from the genuine bill counter Ci by transmittance value to the total genuine bill counter 6. Calculation is performed by dividing by the total number of genuine notes Ng from , and the division result Qi (=Ni /N
s) to the control means 8.

Here, i is m-d, ・-=-, m-2, m 71 ,
m.

m+1. m+2. ...Indicates any value of 1m+α. The control means 8 receives the count amplifier signal 6 when the total number of genuine notes counter counts up, outputs a division command signal 8a to the divider 7, and outputs the division result Qi from the divider 7. 9, and when Qi reaches a specific value, outputs a control signal 8b so that the transmittance value xi having the division result Qi is the center of the transmittance range that can be recognized as a genuine note; It functions to control the determining means 3.

Next, the operation of the automatic recognition sensitivity adjustment device for the banknote validating machine constructed as described above will be explained with reference to FIGS. 2 and 3.

First, the light transmittance of the printing part of banknotes circulating in the market at a certain point in time is as shown in A in Figure 2, with the transmittance value "m" as the center, and the light transmittance from "m-d" to "me". As the years pass, the transmittance of banknotes circulating in the market changes as shown in B in Figure 2 due to differences in the time of manufacture, but the distribution width remains almost constant.

Therefore, in order to detect this difference due to manufacturing time, the present device operates as follows, as shown in FIG. 3.

Here, the total number of genuine banknotes counter 6 counts and stores the total number of genuine banknotes Ng of the banknotes input so far, and the group of genuine banknotes counters C, . . . ..., Cn-2゜CCC
C・・・・・・,C is thisrn-11me m+1 1 m+2+
Number of genuine notes by transmittance value Nm-e until med,
......, NXn-2゜m-19m+ m+1
+ m+2+・””', count 'm+2 N
NN N It is assumed that it is remembered.

When a banknote is inserted into the banknote validator (stopl), the optical sensor 1 outputs an analog signal 1a corresponding to the transmittance, and the A/D converter 2 converts it into a digital signal 2& (stop2). If the inserted bill is a counterfeit bill, please press (stop)
3) A counterfeit bill signal 3C is emitted from the discriminating means 3, and the inserted bill is returned by the bill return mechanism 6 (stop 4).
).

If the inserted bill is a genuine bill (step 5), a genuine bill signal 3a is output from the discrimination means 3, and the inserted bill is stored by the bill storage mechanism 4 (gtep 6). Also, if the transmittance value of the inserted banknote is xa, the corresponding genuine bill count pulse Sa by transmittance value is set to zero, and the corresponding genuine bill count counter Ca by transmittance value is set to true by transmittance value. Count the number of tickets Na (gtep8).

Next, when the total number of genuine notes Na reaches a certain value (st
op9), the total number of genuine notes counter 6 outputs a count-up signal 6a (top10), in response to which the control means 8 outputs a division command signal 8a; performs division sequentially (IItepll),
The division result Q i (=N t /N s ) is output to the control means 8. Then, the control means 8 compares the division result Qi with a specific value that is considered to account for the majority of the total number of genuine bills (stopl2).

Here, this specific value is, for example, 99/100.

At this time, if 0a (=Na/Ns) is less than 99/100, the control means 8 does nothing (stopl3).

On the other hand, if Qa reaches 99/100 or more (stop1
4) A control signal 8b is output to the discriminating means 3 so that the transmittance xa is the center of the transmittance range that can be recognized as a genuine note. After that, the determining means 3 determines the transmittance value xa
is the center of the transmittance range that can be recognized as a genuine note, from Ia-7! 6-7 is newly operated as a transmittance range that can be recognized as a genuine note (+step 15). Then, the control means 8 outputs a clear signal 8C, and the total number of genuine bills counter 6 and the number of genuine bills counted by transmittance value group Cm-, . . . , C
Knee 2゜Cm-1・Cm"m+1.Cm+2"...",
Clear all m+a of C (gtep16).

Further, the number of genuine bills counter 6 does not output the count amplifier signal 6a unless the total number of genuine bills Ng exceeds a certain value (for example, 100), and therefore the control means 8 does not perform a control operation.

This is to prevent incorrect judgment from being made based on the ratio of the number of genuine bills classified by transmittance value to the total number of genuine bills when the number of genuine bills inserted is small.

Further, when the total number of genuine notes Ns overflows, the total number of genuine notes counter 6 receives an overflow signal b, and the group of genuine notes number counters by transmittance value C! In-7゜・・・・・・、
Cfn+2. C, n+1. Cm, Cm+1. Cfn+2
．． .......

Clear all Cm+7.

This is to prevent errors due to counter overflow.

According to the automatic recognition sensitivity adjustment device for a banknote validating machine shown in the embodiment, the optical sensor 1 detects the light transmittance of the printing part of the inserted banknote. and an A/D converter 2 that converts the transmittance detected by the optical sensor 1 into a digital signal;
The D converter 2 converts the digitalized transmittance into a digital signal, and for each transmittance value within a transmittance range that can be recognized as a genuine note, the number of genuine notes having the transmittance value is counted. Counter group Cm-d” “”” l cm-11m' m+
11 """"m+"C and the plurality of counter groups Cm-(t'......, C
m-1゜Cm "m+ 11..., a divider 7 that divides the counted value of Cm+a by the total number of genuine notes, and when the division value by the divider reaches a specific value, the corresponding and control means 8 for determining a transmittance range that can be recognized as a genuine note, with the transmittance as the center.
The ratio of the number of genuine notes with individual transparency values to the total number of genuine notes in the input banknotes is calculated, and the ratio reaches a certain value that is considered to account for the majority of the total number of genuine notes. By determining the transmittance range that can be recognized as a genuine note using the transmittance as a new center, the system detects differences in the shading of printing ink on banknotes depending on the manufacturing date, and automatically adjusts the identification sensitivity. By doing this, it is possible to prevent the deterioration of the genuine note recognition rate due to the number of years of use of the bill validator, and also to eliminate the need to readjust the transmittance range that can be recognized as a genuine note, thereby reducing the effort required for maintenance of the bill validator. This significantly reduces the time required.

Effects of the Invention As described above, the present invention includes an optical sensor that detects the light transmittance of the printed part of the inserted banknote, and an A/D conversion that converts the transmittance detected by the optical sensor into a digital signal. a determination means for determining whether or not the transmittance of the digital signal obtained by the A/D converter is within a transmittance range that can be recognized as a genuine note; a counter for counting the number of genuine bills, a plurality of counter groups for counting the number of genuine bills having a transmittance value for each of a plurality of transmittance values within a transmittance range that can be recognized as genuine bills, and the plurality of counters. A divider that divides the count value of the instrument group by the total number of genuine notes, and when the divided value by the divider reaches a specific value, the relevant transmittance is newly set as the center and the note is recognized as genuine. 9, the ratio of the number of genuine bills having individual transmittance values to the total number of genuine bills in the input banknotes is determined, and the ratio is determined as the total number of genuine bills. When a specific value that is considered to account for the majority of the number of banknotes is reached, the transmittance range that can be recognized as a genuine note is determined based on the new transmittance. By detecting differences in the density of printing ink depending on the time of manufacture and automatically adjusting the recognition sensitivity, it is possible to prevent a decline in the recognition rate of genuine bills due to the age of the bill validator, and to increase the transmittance that allows recognition of genuine bills. Since there is no need to readjust the range, the effort and time required for maintenance of banknote validators can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an automatic recognition sensitivity adjustment device for a banknote validating machine according to the present invention, FIG. 2 is a distribution diagram of light transmittance of printing ink for banknotes, and FIG. 3 is a flowchart showing the operation of the embodiment. DESCRIPTION OF SYMBOLS 1... Optical sensor ~, 2... A/D converter, 3... Discrimination means, 4... Bill storage mechanism, 5... ...Banknote return mechanism, 6...Total genuine banknote counter, Cm-(t + Cm-2'Cm-1
"m" m+1 "m+21 cm+a'...
. . . Genuine bill number counter group by transmittance value, 7 . . . Divider, 8 . . . Control means. Name of agent Patent attorney Akira Kokaji et al. 2 Reflections Figure 1 Figure 2 Figure χ~ (< Iyn−2χ−χ−2χ−・〆 j!t□
. 1M -T X m t 7 chest 3 mouths

Claims (1)

[Claims] An optical sensor detects the light transmittance of the printing part of the inserted banknote, an A/D converter converts the transmittance detected by the optical sensor into a digital signal, and the A/D converter converts the transmitted banknote into a digital signal. A determining means for determining whether the transmittance is within a transmittance range that can be recognized as a genuine note, a counter that counts the total number of genuine bills of the inserted banknote, and a transmittance that is within a transmittance range that can be recognized as a genuine note. a plurality of counter groups that count the number of genuine notes having the transmittance value for each of the plurality of transmittance values; a divider that divides the counted value of the plurality of counter groups by the total number of genuine notes; Automatic identification sensitivity adjustment of a banknote validating machine having a control means for determining a new transmittance range that can be recognized as a genuine note, centering on the transmittance when the division value by a divider reaches a specific value Device.