JPS63276688A - Banknote distinguisher - 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 (Industrial Application Field) The present invention relates to a banknote validating device in a banknote handling device such as a banknote exchange machine or an automatic deposit machine.

(Prior Art) Currency exchange machines, automatic deposit machines, and the like used in banks and the like use built-in bill validators to determine whether or not bills inserted by a customer are genuine bills. In order to improve operability for customers, multiple denominations (e.g. 3 denominations of 10,000, 5,000, and 1,000 coins) can be inserted into the device regardless of the direction in which they are inserted (front, back, left or right), and in large quantities ( For example 10
(approximately 0 sheets) and high speed determination is required. The banknote identification device detects the light and dark patterns of reflected light and transmitted light, the pattern of magnetic ink, etc. on the banknote, compares the detected pattern with a preset standard pattern, and depending on the degree of similarity,
It is determined whether the banknote is a genuine banknote (authenticity determination).

However, since the detection patterns generally differ depending on the direction even for the same denomination, it is necessary to select a standard pattern according to the direction of the denomination of the banknote to be determined and compare it with the detection pattern. Therefore, before determining whether the banknote is a genuine banknote, it is necessary to determine and specify the denomination direction of the banknote. For example, in a device that distinguishes three denominations: 10,000, 5,000, and 1,000 kansen, each denomination has a total of 4 directions: front, back, left, and right.
The bill must be specified in one of the two denomination directions, and if an error occurs in this judgment result, the bill will be judged as false and rejected even though it is a genuine bill. , this determination can be said to be extremely important.

Conventionally, a banknote discrimination device that detects the physical quantity of a banknote to determine its denomination and orientation detects the external dimensions of the banknote, the light and dark patterns of reflected light and transmitted light, the pattern of magnetic ink, etc. and a standard pattern set in advance for all denomination directions, and the denomination direction is determined based on the degree of similarity, or the detected pattern is divided into multiple regions at regular intervals, and the divided regions are used. There are methods in which the direction of the denomination is determined based on the results of the comparison, and there are methods in which the direction of the denomination is determined by performing arithmetic processing on each divided block.

(Problems to be Solved by the Invention) However, the above conventional technology has the following drawbacks.

First, with the method of determining denominations based on external dimensions, there are many cases where banknotes circulated in cars are misjudged because they are shrunk, partially folded, or missing.As a countermeasure, it is necessary to improve the accuracy of dimension detection as much as possible. Due to the necessity, the outer shape detection sensor is also required to have a high degree of precision, making it expensive, and it also has the disadvantage that it cannot be applied to banknotes with no difference in outer dimensions.

Next, in the method of comparing the detection pattern with the standard pattern, standard patterns in all denomination directions (for example, 10,000, 5,000, 1,000 banknotes as in the above example) are used to compare the detected pattern with the standard pattern. If we identify the front, back, left and right sides of each of the three denominations, we get 12
Since the results cannot be obtained unless compared with the standard), it takes a long processing time and cannot be used in equipment that requires high-speed processing, and high-performance hardware is required to shorten the time. It had the disadvantage of being expensive.

Furthermore, in the method of discriminating the denomination direction by dividing the detection pattern at regular intervals, when designing the discrimination logic, it is difficult to distinguish between banknotes whose overall designs are similar. In many cases, the difference between the two is not always clear, and there is a problem that there is a high risk of misjudgment due to dirt, shrinkage, etc. of the banknote.

The present invention has been made in view of the problems of the prior art described above, and has a high degree of tolerance even if the banknote is soiled, shrunk, partially bent, missing, etc., and can be done in a short time and at low cost. It is an object of the present invention to provide a bill validating device that can discriminate the denomination direction.

(Means for Solving the Problems) In order to solve the problems of the prior art, the banknote validating device of the present invention includes a detection means for detecting the physical quantity of a banknote, and a series of signals obtained by the detection means. The apparatus is provided with a region setting means for performing extraction and setting a plurality of detection signal regions, and a discriminating means for determining the denomination direction of the banknote based on the detection signal in the region set by the region setting means.

(Function) In the present invention, the detection means detects physical quantities such as the brightness of the reflected light of the banknote, the brightness and darkness of the transmitted light of the banknote, and the magnetic ink pattern of the banknote. The region setting means sets a plurality of detection signal regions from the series of detection signals obtained by the detection means so that features in the direction of the denomination can be reliably detected. The discriminating means discriminates the denomination direction of the banknote according to the detection signal for each area set as described above, so even if the banknote is dirty, shrunk, partially bent, missing, etc. Discrimination can be made in a short time without being influenced by this.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a functional block diagram showing the configuration of the bill validating device of this embodiment, and FIG. 2 is a diagram showing the arrangement of sensors in the bill validating device.

First, referring to FIG. 2, the sensor arrangement will be described. On the conveyance path 2■, there is a banknote detector 23 that detects the arrival of banknotes 22 transported by a transport means (not shown), and a banknote detector 23 that detects the brightness of the reflected light of the banknotes 22. A detector 24 is provided.

The bill detector 23 includes a light source 2 that irradiates light onto the conveyance path 21.
5 (e.g. LED) and the light from the light source 25 to the transport path 21.
It consists of a light-receiving sensor 26 (for example, a photodiode) that detects the light by sandwiching it therebetween. The detector 24 includes a light source 27 (for example, an LED) that irradiates light onto the conveyance path 21, and a light source 27 that emits light onto the conveyance path 21.
The light source 27 and the light receiving sensor 28 are arranged at a predetermined interval from each other at a predetermined interval.
Versus side by side.

Next, the apparatus configuration of this embodiment will be described with reference to FIG. In FIG. 1, the same elements as in FIG. 2 are given the same reference numerals. The output terminal of the detector 24 is connected to the input terminal of the amplifier circuit 1, and the detector 24 detects the brightness and darkness of the reflected light of the banknote 22, and outputs an electric signal corresponding to the detected result. The output terminal of the amplifier circuit 1 is connected to the input terminal of the multiplexer 2, and the amplifier circuit 1 amplifies the output signal of the detector 24 and outputs the amplified signal.

On the other hand, the output terminal of the banknote detector 23 is connected to the input terminal of the timing signal generation circuit 10, and the banknote detection signal t
Outputs 1. The multiplexer control signal (t2) output terminal of the timing signal generation circuit 10 is connected to the control signal input terminal of the multiplexer 2, and the sampling clock signal (t3) output terminal is connected to the sampling clock input terminal of the A/D conversion circuit 3, which will be described later. and the write address signal (al) output terminal and the memory write control signal (t4
) output terminals are respectively connected to a write address signal input terminal and a write control signal input terminal of a memory circuit 4, which will be described later, and a banknote passing signal (t5) output terminal is connected to a banknote passing signal input terminal of a discriminating unit control circuit 11, which will be described later. It is connected. The output terminal of the multiplexer 2 is connected to the analog signal input terminal of the A/D conversion circuit 3, and the human input signals Sl, S2 . S3. One signal is selected from S4 and output. The data output terminal of the A/D conversion circuit 3 is
It is connected to the data input terminal of the memory circuit 4, and in synchronization with the sampling clock signal t3 from the timing signal generation circuit 10, converts the analog input signal into a digital signal and outputs it.

On the other hand, a read address signal a2 output terminal and a memory read control signal t6 output terminal of the discriminator control circuit 11 are connected to a read address signal input terminal and a read control signal input terminal of a memory circuit 4, which will be described later, respectively. The control signal (t7) output terminal is connected to the control signal input terminal of the integrating circuit 5, which will be described later, and the slice level storage circuit control signal (t8) output terminal is connected to the slice level storage circuit 7, which will be described later.
is connected to the control signal input terminal of the counting circuit control signal (t
9) The output terminal is connected to a control signal input terminal of a counting circuit 9 described later, and the discrimination circuit control signal (too) output terminal is connected to a control signal input terminal of a discrimination circuit 6 described later.

A data (S5) output terminal of the memory circuit 4 is connected to a data input terminal of an integrating circuit 5, which will be described later, and a data input terminal of a comparator 8, which will be described later. Data S5 to be stored in the circuit is output based on t6. An output terminal of the integrating circuit 5 is connected to an integral value input terminal of a discriminating circuit 6, which will be described later, and outputs an integral value I based on a control signal t7.

On the other hand, the output terminal of the slice level storage circuit 7 is connected to the slice level input terminal of a comparator 8, which will be described later.
Based on the control signal t8, a slice level S6 is output. The output terminal of the comparator 8 is connected to a counting input terminal of a counting circuit 9 to be described later, and the data S5 and the slice level S
The comparison result S7 of 6 is output. The output terminal of the counting circuit 9 is connected to a count value input terminal of a discrimination circuit 6, which will be described later, and outputs a count value S8 based on the control signal t9. An output terminal of the discrimination circuit 6 is connected to a discrimination result input terminal of a higher-level circuit (not shown), and outputs a discrimination result based on the integral value I, the count value S8, and the control signal tlo.

Next, the operation of the apparatus of this embodiment will be explained.

This embodiment is an example in which a total of 12 denomination directions, 4 directions (front, back, left and right), are discriminated for each of the three denominations of 10,000, 5,000, and 1,000 denominations. has different characteristics in terms of brightness and darkness of this reflected light. Now, among these denomination directions, the banknote conveying means (
(not shown) to the apparatus of this embodiment,
This is detected by the banknote detector 23, and the banknote detector 23
outputs a banknote detection signal t1. After being detected by the banknote detector 23, the reflected light from the upper surface of the banknote 22 is detected by the detector 24. 4 detected by the 4 detectors 24
The four signals Sl, S2, 53.54 are each amplified by four amplifier circuits 1 and output. As the banknotes 22 are transported, they are scanned in the transport direction.

A series of detection signals S obtained by the passage of banknotes 22.

An example of this is shown in FIG. 3(a). As described above, this series of detection signals Sl is converted from an analog signal to a digital signal by the A/D conversion circuit 3 based on the sampling clock signal t3 as shown in FIG. 3(b), and a series of converted sampling data S5 becomes as shown in FIG. 3(C).

On the other hand, the timing generation circuit 10 generates a banknote passing signal t5, a multiplexer control signal t2 synchronized with the conveying speed of the banknote 22, a sampling clock signal t3, a write address signal a, and a memory write signal t1 manually by the banknote detection signal tl. A signal t4 is output. These signals are as shown in FIG. 4, and when the banknote detection signal t1 changes from "0" to "1", the multiplexer 2 selects the detection signal S1 according to the multiplexer control signal t2, and the A/D conversion circuit selects the detection signal S1. Output to 3. The A/D conversion circuit 3 digitally converts this signal S1 using the sampling clock signal t3.

The digitally converted data is sent to the address of the memory circuit 4 by the write address signal a1 and the memory write signal t4.
Similarly, the detection signals S2, S3.
S4 is also A/D converted and stored at addresses "1" and "3" of the memory circuit 4, respectively. Thereafter, the banknote 22 passes in the same way, and the banknote detection signal t1 changes from "1" to "0".
Continue sequential sampling and memorization until Banknote 1
Memory circuit 4 after sampling and storage for one sheet are completed
The stored contents are as shown in FIG. 5, and the relationship between the contents of the memory circuit 4 and the sample positions of the banknotes 22 is as shown in FIG.

When the banknote 22 passes and the sampling and storage are completed,
A banknote passing signal t5 is outputted as shown in FIG. 4, and in response to this, the discriminator control circuit 11 starts operating. For example, as shown in FIG. 6, the discrimination unit control circuit 11 divides the detection signals S, T2 to S, and T6 stored in the memory circuit 4 into areas Bl, S, so that the characteristics of a certain denomination direction can be reliably detected.
, T5~S, T-, area B2, 52T4~S2T,
, 2 in area B3. S2T, 13 to 52Tn to area B4
゜S3T, 4-53Tn-, area B5, 54Ts
~S4T, . . . 5 is set in advance as region B6 at an arbitrary position and arbitrary length on the sensor scanning track. The address of the memory circuit 4 is designated by the read address signal a2 for each set area, and the sampled storage contents are outputted to the data output terminal of the memory circuit 4 by the memory read signal t6.

The control signal t7 consists of a clear signal t7-1 indicating the start of addition in a certain area, and a sampling data valid signal t7-2 indicating that the sampling data S5 of the certain area read by the memory circuit 4 is valid. The integrator circuit 5 sets the integral value I to zero by the clear signal t7-1,
Sequentially adding the sampling data S5 of the certain area read out by the memory circuit 4 according to the sampling data valid signal t7-2,
Calculate the integral value I. Based on the control signal t8, the slice level storage circuit 7 outputs to the output terminal a slice level S6 that is set in advance for each area so that features for each denomination direction can be easily extracted. The comparator 8 outputs the sampling data S5 and the slice level S as shown in FIG. 3(C).
6 and outputs the comparison result S7 to the counting circuit 9. The counting circuit 9 receives the counting result S8 by the control signal t9.
is set to zero, the comparison result S7 of the comparator 8 is counted, and the counting result S8 is output to the discrimination circuit 6. The discrimination circuit 6 uses the integral value I and the counting result S8 as a control signal tlo.
Read by. If these signals are made into a time chart, it will be as shown in FIG.

The read integral value I and the counting result S8 are each compared with the reference value of the corresponding region among the reference values for each region determined in advance. FIG. 8 shows the direction of each denomination determined based on the reference value for each area. For example, if the integral value I in the B1 area is smaller than the standard value, 10,000 A, 10,000 B, 5,000 B, 5,000 C
It is determined that either The letters after banknotes indicate the four directions: front, back, left, and right. In this manner, the integral value I and the counting result S8 are obtained for each region of B, to B6, and the integral value I and the counting result S8 are compared with the standard value for each region, and the logic of this comparison result is calculated. The denomination direction of the banknote can be determined by the product.

In this embodiment, six regions are extracted from the signals detected by the four detectors 24 on one side of the banknote 22, and the above-mentioned integral calculation and comparison are performed for each region, and based on the results, the direction of the denomination is determined. For example, if we want to perform discrimination in 12 denomination directions (front, back, left, and right) for each of the three denominations of 10,000, 5,000, and 1,000 denominations, a minimum of four areas are required. However, if it is necessary to improve the margin against erroneous discrimination, it is possible to freely increase the number of regions that are effective for discrimination. Further, in this embodiment, discrimination is performed based on the brightness and darkness of reflected light, but the present invention is not limited to this, and discrimination is performed based on various physical quantities such as the brightness and darkness of transmitted light and the pattern of magnetic ink. You can do it as you like. Moreover, the integrating circuit 5 of this embodiment,
It goes without saying that the discrimination circuit 6, comparator 8, counting circuit 9, and discrimination section control circuit 11 are not limited to a hardware configuration, but can also be realized by a microcomputer program or the like.

(Effects of the Invention) As explained above, according to the banknote validating device of the present invention,
Multiple detection signal areas are set from a series of detection signals of physical quantities of banknotes, and the direction of the denomination is determined based on the detection signals for each area.
With a higher degree of margin against misclassification due to defects, etc.
The denomination direction can be determined in a short time. Furthermore, because there is greater freedom in selecting data for building the discrimination logic for denomination direction without changing the method, it is possible to easily accommodate the addition of new banknotes to be discriminated. You can expect it.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a bill validating device according to an embodiment of the present invention, FIG. 2 is a diagram showing the arrangement of sensors in the device shown in FIG. 1, and FIG. 3 shows a detection signal S3, a sampling clock signal t1, A diagram showing an example of sampling data S5,
Figure 4 is a time chart of the output of the timing signal generation circuit, Figure 5 is a diagram showing the contents of the memory circuit, Figure 6 is a diagram showing the relationship between the sample position of the banknote and the contents of the memory circuit, and Figure 7 is a diagram showing the contents of the memory circuit. FIG. 8 is a time chart of signals related to the denomination direction determination, and is an explanatory diagram of the denomination direction determination. 1...Amplification circuit 2-axis/multiplexer 3-
A/D conversion circuit 4...Memory circuit 5...Integrator circuit 6-axis/discrimination circuit 7...Slice level storage circuit 8...Comparator 9...Counting circuit 10...
- Timing signal generation circuit 11...Discrimination section control circuit 23...Banknote detector 24
...Detector 7/ T2Tn Book 4 Figure "Swift 70, 77 signal M (b) ■1 51) a, S5-1911X6, 1℃ stone old death,
3 V4

Claims (7)

[Claims] (1) a detection means for detecting a physical quantity of a banknote; an area setting means for extracting from a series of signals obtained by the detection means and setting a plurality of detection signal areas; 1. A bill validating device comprising: a determining means for determining the denomination direction of a bill based on a detection signal. (2) The discrimination means includes a calculation unit that performs calculations on the detection signal for each area set by the area setting unit, and a determination unit that determines the denomination direction of the banknote based on the calculation result of the calculation unit. A bill validating device according to claim 1, characterized in that: (3) The bill validating device according to claim 2, wherein the calculation section is an integrating means that integrates the detection signal. (4) The bill validating device according to claim 1, wherein the physical quantity is an amount of reflected light from a bill. (5) The bill validating device according to claim 1, wherein the physical quantity is the amount of light transmitted through the bill. (6) The bill validating device according to claim 1, wherein the physical quantity is a magnetic quantity of a bill. (7) The calculation means is a comparison and counting means that compares the detection signal for each region set by the region setting means with a reference signal preset for each region, and counts the comparison result. A bill validating device according to claim 2, characterized in that: