JPH06176237A - Paper sheets identifying device - Google Patents

Abstract

PURPOSE:To improve the accuracy of identification by preventing the influence of detector sensitivity or the like by correcting the output of a specified detecting means to detect the physical pattern of a medium based on the maximum and minimum values and correcting the output of the other detecting means while considering a correcting value ratio. CONSTITUTION:Concerning a first correcting means 8, a maximum value retrieving means 11 retrieves the maximum value of the output from a specified detecting means 101, and a minimum value retrieving means 12 retrieves the minimum value. Then, a first correcting arithmetic means 13 corrects the output of the detecting means 1-1 based on the maximum and minimum values and outputs the result to a second storage means 10. On the other hand, second correcting means 9-1...9-n correct the outputs of detecting means 1-2...1-n excepting for the detecting means 1-1 based on the correcting value ratios stored in correcting value ratio storage means 14-1...14-n and the maximum and minimum values retrieved by the retrieving means 11 and 12 and output the values to the storage means 10. A denomination judging means 5 judges the denomination based on the stored value in the storage means 10 and based on the stored value and the denomination judged result, a truth j judging means 6 judges the authentication of a paper money.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet discriminating apparatus used in an automatic depositing / dispensing machine, an automatic vending machine or the like.

[0002]

2. Description of the Related Art When a customer inserts a bill into an automatic depositing / dispensing machine or an automatic vending machine, a denomination of the bill is determined, and a process for determining the authenticity of the bill is performed.
A bill discriminating device is used as a paper discriminating device for this purpose. This bill validator detects the optical pattern of reflected light, transmitted light, etc. from the pattern or figure of the inserted bill, or the magnetic pattern of the magnetic ink used for printing the bill. This is compared with a reference value set in advance, and the discrimination is performed based on the degree of similarity or in combination with the detection result of the outer dimension of the bill.

For example, an image sensor such as an LED (light emitting diode), a photodiode, a phototransistor, or a CCD is used to detect an optical pattern.
A magnetic head or the like is used to detect a magnetic pattern. Since the sensitivity and the like of these sensors and magnetic heads fluctuate due to environmental changes such as temperature and changes with time, the detection signals are corrected by the temperature compensating means and correcting means.

By the way, the discrimination of the inserted banknotes is carried out in two stages of denomination determination and authenticity determination. First, for the portion of the detected optical or magnetic pattern where the difference due to denomination is large, such as the position of the watermark, by comparing with a preset reference value, the denomination of the inserted bill is determined. I do. Next, all the detected patterns are compared with a reference value set in advance for each denomination, and the authenticity is determined based on the magnitude of the similarity.

FIG. 2 shows a bill discriminating apparatus as a conventional sheet discriminating apparatus. The apparatus shown in the figure comprises a detection means 1, a temperature detection means 2, a temperature compensation means 3, a storage means 4, a denomination determination means 5, and a true / false determination means 6. The detection means 1 detects an optical pattern or a magnetic pattern such as reflected light or transmitted light from a pattern or a figure of a bill as an inserted medium and outputs a detection signal (detection pattern) thereof. Is. The temperature detecting means 2 is means for detecting the temperature in the vicinity of the detecting means 1, and the temperature compensating means 3 uses the output signal (detection signal) of the detecting means 1 as the temperature detection result of the temperature detecting means 2. Based on this, it has a function of temperature compensation.

The storage means 4 is a memory for temporarily storing the detection signal temperature-compensated by the temperature compensation means 3. Then, the denomination determination means 5 outputs from the storage means 4 (a detection signal of an optical or magnetic pattern of a bill).
Based on the above, by comparing a part of the optical or magnetic pattern having a large difference due to denomination such as a watermark position with a preset reference value,
It is a means for determining the denomination of the inserted bill. Also,
The authenticity judging means 6 is a means for judging the authenticity of the inserted bill by comparing all or part of the detection signal with a preset reference value.
The authenticity determination result of the inserted banknote and the denomination determination result of the inserted banknote by the denomination determining unit 5 are output to a higher-level device (not shown).

Next, the operation of the paper sheet discriminating apparatus having the above construction will be described. First, the detection means 1 detects an optical or magnetic pattern of the inserted bill and outputs the detection pattern to the temperature compensation means 3. On the other hand, the temperature detecting means 2 detects the temperature in the vicinity of the detecting means 1 and outputs a temperature detection signal corresponding to the detected temperature to the temperature compensating means 3. The temperature compensating means 3 compensates the detection pattern input from the detecting means 1 according to the temperature detected by the temperature detecting means 2, outputs the temperature-compensated detection pattern to the storing means 4, and stores this. 4 remembers.

Then, the denomination determination means 5 is based on the stored contents (detection pattern) of the storage means 4 and sets a preset reference for a portion of the detection pattern, such as a watermark position, which is largely different depending on the denomination. By comparing the value with the value, the denomination of the inserted bill is determined, and the denomination determination result is output to the host device and the authenticity determination means 6. Also,
The authenticity determination unit 6 compares the reference value of the corresponding denomination with the storage result (detection pattern) of the storage unit 4 based on the denomination determination result from the denomination determination unit 5, and the banknote based on the comparison result. The true / false determination is performed and the true / false determination result is output to the host device.

[0009]

However, in the above-mentioned conventional paper sheet discriminating apparatus, there is no influence on the sensitivity change due to the temperature change such as the light emitting diode, the photodiode, the phototransistor, and the magnetic head constituting the detecting means 1. Although temperature compensation can be performed so as to eliminate it, it is not possible to compensate for changes over time such as deterioration and wear of these detection elements. Therefore, there is a problem that the detection patterns vary greatly, and it is not possible to perform banknote discrimination with high accuracy. The present invention has been made in order to solve the above-mentioned conventional problems, and is less susceptible to environmental changes such as sensitivity and offset of a detection element (photoelectric conversion element or magnetoelectric conversion element) that constitutes detection means and changes over time. An object of the present invention is to provide a paper sheet discriminating apparatus which is inexpensive and has high accuracy.

[0010]

A paper sheet discriminating apparatus of the first invention comprises a plurality of detecting means for detecting physical patterns at a plurality of locations on a medium, and outputs the output from the plurality of detecting means. In the paper sheet discriminating apparatus that performs the correction and discriminates the medium based on the corrected values, one of the plurality of detecting means is a specific detecting means, and the maximum value of the detection output of the specific detecting means. Maximum value search means for detecting
An output of the specific detection means based on the minimum value search means for detecting the minimum value of the detection output of the specific detection means, the maximum value search means and the maximum value and the minimum value detected by the minimum value search means. A correction value ratio that is connected to a first correction calculation unit that corrects a value and a detection unit other than the specific detection unit and stores a ratio of the correction values of the specific detection unit and the other detection unit that are calculated in advance. Based on the storage means, the value of the correction value ratio storage means, the maximum value and the minimum value detected by the maximum value search means and the minimum value search means, output values of the detection means other than the specific detection means. It is characterized by comprising a second correction calculation means for correction, the first correction calculation means, and a discrimination means for discriminating the medium based on the output from the second correction calculation means. .

The paper sheet discriminating apparatus of the second invention comprises a plurality of detecting means for detecting physical patterns at a plurality of locations on the medium, and corrects the outputs from the plurality of detecting means. In the paper sheet discriminating apparatus for discriminating the medium based on the value obtained, one of the plurality of detecting means is a specific detecting means, and a maximum value search for detecting the maximum value of the detection output of the specific detecting means is performed. Means, a first correction calculation means for correcting the output value of the specific detection means based on the maximum value detected by the maximum value search means, and a detection means other than the specific detection means, A correction value ratio storage means for storing the calculated ratio of the correction values of the specific detection means and the other detection means, a value of the correction value ratio storage means, and a maximum value detected by the maximum value search means. Based on the above Second correction calculation means for correcting the output value of the detection means other than the detection means, the first correction calculation means, and a discrimination means for discriminating the medium based on the output from the second correction calculation means. It is characterized by having.

The paper sheet discriminating apparatus of the third invention comprises a plurality of detecting means for detecting physical patterns at a plurality of locations on the medium, and corrects the outputs from the plurality of detecting means. In the paper sheet discriminating apparatus for discriminating the medium based on the value obtained by the above, one of the plurality of detecting means is a specific detecting means, and an integral value calculation for calculating an integral value of the detection output of the specific detecting means Means, and a first correction calculation means for correcting the output value of the specific detection means based on the value of the integrated value calculation means, and the predetermined calculation means connected to detection means other than the specific detection means. The correction value ratio storage means for storing the detection means and the correction value ratio between the detection means, the value of the correction value ratio storage means, and the integrated value output from the integrated value computing means, Of detecting means other than detecting means It is characterized by further comprising: a second correction calculation means for correcting the force value; the first correction calculation means; and a discrimination means for discriminating the medium based on the output from the second correction calculation means. It is a thing.

[0013]

In the first aspect of the invention, the correction of the output of the specific detection means is performed by the first correction means, and the correction of the output of the other detection means is performed by the second correction means. In the first correction means, the maximum value search means searches for the maximum value of the output of the specific detection means, and the minimum value search means searches for the minimum value. And
The first correction calculation means corrects the output of the specific detection means based on the maximum value and the minimum value, and outputs the corrected output to the second storage means. On the other hand, the second correction means outputs the outputs of the detection means other than the specific detection means by the correction value ratios stored in the correction value ratio storage means and the maximum value and minimum value search means by the maximum value search means. Correction is performed based on the minimum value and the value is output to the second storage means. The denomination determining means determines the denomination of the bill based on the value stored in the second storage means, and the authenticity determining means determines the value stored in the second storage means and the denomination by the denomination determining means. The authenticity of the bill is determined based on the seed determination result.

In the second invention, as in the first invention, the output of the specific detecting means is corrected by the first correcting means, and the output of the other detecting means is corrected by the second correcting means. Done in. In the first correction means, the maximum value search means searches for the maximum value of the output of the specific detection means, and the first correction calculation means corrects the output of the specific detection means based on the maximum value. Output to the second storage means. On the other hand, the second correction means corrects the outputs of the detection means other than the specific detection means based on the correction value ratios stored in the correction value ratio storage means and the maximum value by the maximum value search means, The value is output to the second storage means. The denomination determining means determines the denomination of the bill based on the value stored in the second storage means, and the authenticity determining means determines the value stored in the second storage means and the denomination by the denomination determining means. The authenticity of the bill is determined based on the seed determination result.

In the third invention, as in the first and second inventions, the correction of the output of the specific detection means is performed by the first correction means, and the correction of the output of the other detection means is performed by the second correction means. Correction means. In the first correction means, the integrated value calculation means calculates the integrated value of the output of the specific detection means, and the first correction calculation means corrects the output of the specific detection means based on the integrated value. Output to the second storage means. On the other hand, the second correction means corrects the outputs of the detection means other than the specific detection means based on the correction value ratios stored in the correction value ratio storage means and the integrated value by the integrated value calculation means, The value is output to the second storage means. The denomination determining means determines the denomination of the bill based on the value stored in the second storage means, and the authenticity determining means determines the value stored in the second storage means and the denomination by the denomination determining means. The authenticity of the bill is determined based on the seed determination result.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. << First Embodiment >> FIG. 1 is a block diagram showing a first embodiment of the paper sheet discriminating apparatus of the present invention. The same drawing shows a bill validator, and the device in the figure is composed of a plurality of detecting means 1.
(1-1 to 1-n), a plurality of first storage means 7 (7-1
~ 7-n), the first correction means 8, the second correction means 9 (9
-1 to 9-n), a second storage unit 10, a denomination determination unit 5, and a true / false determination unit 6.

The detecting means 1 is means for detecting an optical or magnetic pattern such as reflected light or transmitted light from the pattern or figure of the inserted bill and outputting the detection signal (detection pattern). The detecting means 1 is composed of a photoelectric conversion element such as a light emitting diode, a phototransistor, or a photodiode, or a magnetoelectric conversion element such as a magnetic head. Further, a plurality of detection elements (photoelectric conversion elements or magnetoelectric conversion elements) constituting the detection means 1 are arranged, and each of them is adapted to detect a physical pattern of a bill, and these are detected by the detection means 1-1 to 1-1. Corresponds to 1-n. Further, in the present embodiment, as one of the plurality of detecting means 1, the detecting means 1-1 is a specific detecting means.

The first storage means 7 (7-1 to 7-n) is
The input side is a buffer memory connected to the output side of the detection means 1 (1-1 to 1-n), and the storage means 7 outputs the output signal of the detection means 1 (an optical pattern or magnetic Pattern) is temporarily stored. Further, in this embodiment, the first storage means 7-1 is configured to store the output of the specific detection means 1-1. The input side of the first correction means 8 is the first storage means 7-
The second correction means 9 (9-1 to n) are connected to the output side of the first storage means 7-2 to 7-n. As well as
The correction means is connected to the output sides of the maximum value search means 11 and the minimum value search means 12 described later provided in the first correction means 8. The second storage means 10 is a memory whose input side is connected to the output sides of the first correction means 8 and the second correction means 9, and stores the corrected detection pattern.

Further, the denomination judging means 5 is similar to the conventional one.
A part of the detection pattern (optical or magnetic pattern of banknotes) stored in the second storage means 10 (for example, a part such as a watermark position where there is a large difference between denominations).
Alternatively, the denomination of the inserted bill is determined by comparing all of them with a preset reference value.
Further, the authenticity judging means 6 is a means for judging the authenticity of the inserted bill by comparing all or part of the detection signal with a preset reference value. The authenticity determination result of the inserted banknote and the denomination determination result of the inserted banknote by the denomination determining unit 5 are output to a higher-level device (not shown).

The first correction means 8 comprises a maximum value search means 11, a minimum value search means 12 and a first correction calculation means 13. The first correction means 8 inputs the detection pattern from the first storage means 7-1 and the corrected detection is made from the first correction calculation means 13, the maximum value search means 11 and the minimum value search means 12, respectively. It outputs the pattern, maximum and minimum values. Maximum value search means 1
1 and the minimum value search means 12 are the first storage means 7-1.
The detection pattern is input from and the maximum value and the minimum value are output to the first correction calculation means 13 and the second correction calculation means 15 described later, respectively. First correction calculation means 13
Inputs the detection pattern, the maximum value and the minimum value from the first storage means 7-1, the maximum value search means 11 and the minimum value search means 12, respectively, and outputs the corrected detection pattern to the second storage means 10. It is a thing.

The second correction means 9 is a correction value ratio storage means 1
4 (14-1 to 14-n) and the second correction calculation means 15
(15-1 to 15-n). The second correction means 9 includes a detection pattern, a correction value ratio and a maximum value from the first storage means 7-2 to 7-n, the correction value ratio storage means 14, the maximum value search means 11 and the minimum value search means 12, respectively. The value and the minimum value are input, and the corrected detection pattern is output to the second storage unit 10. Further, the correction value ratio storage means 14
Is a non-volatile storage means for storing the correction value ratio obtained by the adjustment medium before the paper sheet discrimination apparatus according to the present invention is shipped. The determination of the correction value ratio will be described later.

The operation of the paper sheet discriminating apparatus configured as described above will be described. When the arrival of the bill is notified by the output from the bill detecting means (not shown) that detects the arrival of the inserted bill or by the signal from the host device (not shown), the detecting means 1 is activated. enter. Then, the detecting means 1 causes a plurality of photoelectric conversion elements to arrange a pattern of transmitted light or reflected light, which changes depending on the shade and density of the pattern of the banknote, every time the banknote is conveyed for a certain distance.
Alternatively, the detection is performed in synchronization with a timing signal from a timing transmission means (not shown) that outputs a pulse at regular intervals. Alternatively, a plurality of magnetic-electric conversion elements (for example, magnetic heads or the like) are arranged to detect the shade pattern (magnetic pattern) of the magnetic ink of the bill in synchronization with the timing signal. Here, since the transmitted light pattern and the magnetic pattern can be handled in the same manner as the reflected light pattern, the description of the transmitted light pattern and the magnetic pattern will be omitted below.

FIG. 3 shows an example of the reflected light pattern output from each detecting means 1. In FIG. 3, (a) shows the stored contents of the first storage means 7-1 and shows the reflected light pattern p1i. Further, (b) shows the first storage means 7-
The reflected light pattern p2i is shown by the stored contents of 2 to 7-n. The maximum value search means 11 and the minimum value search means 12 of the first correction means 8 search the maximum value p1max and the minimum value p1min of the reflected light pattern p1i stored in the first storage means 7-1, and To the second correction calculation means 13 and the second correction calculation means 15.

The reflected light pattern shown in FIG. 3 is a waveform obtained by sampling and quantizing the reflected light pattern when a bill is scanned in the direction of the arrow in the drawing. Then, the first correction calculation means 13 performs the correction as follows. That is, for the reflected light pattern p1i, the maximum value p1max and the minimum value p1min are used to perform the correction so that the maximum value p1max becomes 1 after correction and the minimum value p1min becomes 0 after correction. . When the corrected reflected light pattern is q1i (i = 1, 2, ..., N), the corrected reflected light pattern q1i is obtained by the following equation (1). q1i = (p1i-p1min) / p1max (i = 1, 2, ..., N) (1) The above equation (1) is theoretically expressed as q1i = (p1i-p1mi
n) / p1max-p1min, but p1min is a very small value, and therefore p1min is ignored for practical purposes and the above equation (1) is used.

In the second correction calculation means 15, the maximum value searching means 11 and the minimum value searching means 21 are respectively the maximum value p1.
When max and the minimum value p1min are output, the correction value ratios r2max and r2min stored in advance in the correction value ratio storage means 14 are read out, and the reflected light patterns p2i stored in the first storage means 7-2 to 7-n. Is corrected as in the following equation (2), and the corrected reflected light pattern q2i is output. q2i = (p2i- (r2min * p1min)) / (r2max * p1max) (2) FIG. 4 shows a result of correcting the detection pattern of FIG. That is, FIG. 4A shows the pattern output from the first correction calculation means 13, and FIG. 4B shows the second correction calculation means 1.
5 is a pattern output from 5.

The correction value ratios r2max and r2min are values stored by the output of the adjusting medium when the paper sheet discriminating apparatus is assembled and shipped, and the specific detecting means 1-1.
And the output of the other detection means 1-2 to 1-n. r2
max is a value obtained by the adjusting medium having a high reflectance and is greatly affected by the sensitivity of the photoelectric conversion element constituting the detecting means 1, and r2min is a value obtained by the adjusting medium having a low reflectance and constitutes the detecting means 1. It is greatly affected by the dark current of the photoelectric conversion element.

Next, such correction value ratios r2max, r2
How to find min is explained concretely. Let w1 be the output of the detection means 1-1 when the adjustment medium having a high reflectance is scanned at the time of shipping, and b1 be the output when the adjustment medium having a low reflectance is scanned, and the detection means 1-2 to 1- When the output of n is w2 and the output when the adjustment medium having a low reflectance is scanned is b2, the correction value ratios r2max and r2min are obtained by the following equations (3) and (4), respectively. r2max = w2 / w1 (3) r2min = b2 / b1 (4) Then, the correction value ratios r2max and r2 thus obtained.
min is stored in each of the correction value ratio storage means 14-1 to 14-n. Therefore, the correction value ratios stored in the correction value ratio storage means 14 are the same as the detection means 1 connected to each other.
The correction value ratios of −2 to 1-n are shown.

The data of the reflected light pattern thus corrected by the first correction calculation means 13 and the second correction calculation means 15 is stored in the second storage means 10.
The reflected light pattern stored in the second storage means 10 is output to the denomination determination means 5 and the authenticity determination means 6, and the denomination determination means 5 firstly detects the position of the watermark in the detected and corrected reflected light pattern. As described above, the denomination of the inserted banknote is determined by comparing with a preset reference value for a portion having a large difference depending on the denomination, and the determination result is output to a host device (not shown) and the authenticity determination means 6. . Further, the authenticity determination means 6 compares all the detected and corrected reflected light patterns with a reference value set in advance for each denomination, and determines the authenticity based on the magnitude of the similarity, and the determination result is not shown. Output to host device. In this way, the paper sheet discriminating apparatus of the present embodiment can discriminate the denomination and the authenticity of the inserted banknote and output it to the upper apparatus.

As described above, in the first embodiment, first, the maximum value and the minimum value of a certain detection pattern are obtained, and then the correction calculation of the other detection pattern is corrected by using a previously stored correction value ratio. Although the operation has been described by the method of performing the calculation, if the dark current of the detecting means for detecting the pattern is not easily affected by the environmental change or the secular change, the maximum value of one detection pattern is first obtained and the other detection patterns are obtained. The same effect can be expected by the method of performing the correction calculation using the correction value ratio stored in advance. This will be described below as a second embodiment.

<< Second Embodiment >> Next, a second embodiment of the present invention will be described. FIG. 5 is a block diagram showing a second embodiment of the paper sheet discriminating apparatus. In the figure, detecting means 1 (1
-1 to 1-n), the first storage means 7 (7-1 to 7-)
n), the second storage means 10, the denomination determination means 5, and the authenticity determination means 6 are the same as those in the first embodiment, and therefore the description thereof is omitted here.

Further, the first correction means 16 is connected to the first storage means 7-1, and the first storage means 7-2 to 7-n.
The second correction means 17-1 to 17-n are connected to the respective. The first correction means 16 is the maximum value search means 1
1 and the first correction calculation means 18. The maximum value search means 11 has the same function as the maximum value search means 11 of the first embodiment, and searches the maximum value from the reflected light pattern stored in the first storage means 7-1. Is.
The first correction calculation means 18 performs correction calculation of the reflected light pattern stored in the first storage means 7-1 based on the maximum value retrieved by the maximum value retrieval means 11.

The second correction means 17 includes the correction value ratio storage means 19 (19-1 to 19-n) and the second correction calculation means 2
0 (20-1 to 20-n). The correction value ratio storage means 19 includes a specific detection means 1-1 and other detection means 1-2.
The second correction calculation means 20 is a non-volatile memory that stores the ratio of the output to 1-n, based on the value of the correction value ratio storage means 19 and the output of the maximum value search means 11, respectively.
The correction calculation of the reflected light pattern stored in the first storage means 7-2 to 7-n is performed. The correction value ratio stored in the correction value ratio storage means 19 will be described later.

Next, the operation of the paper sheet discriminating apparatus having the above construction will be described. First, the detection means 1-1 to 1-n detect the reflected light patterns of the banknotes and store them in the first storage means 7-1 to 7-n, respectively, as in the first embodiment. Is.

FIG. 6 shows an example of the reflected light pattern output from each detecting means 1. In FIG. 6, (a) shows the stored contents of the first storage means 7-1 and shows the reflected light pattern p3i. Further, (b) shows the first storage means 7-
The reflected light pattern p4i is shown by the stored contents of 2 to 7-n. The maximum value search means 11 of the first correction means 16 and the reflected light pattern p3i stored in the first storage means 7-1.
The maximum value p1max of is calculated and output to the first correction calculation means 18 and the second correction calculation means 20.

The reflected light pattern shown in FIG. 6 is a waveform in which the reflected light pattern when a bill is scanned in the direction of the arrow is sampled and quantized at fixed time intervals. And
The first correction calculation means 18 performs the correction as follows. That is, for the reflected light pattern p3i, calculation is performed so that the maximum value p1max becomes 1 after correction, and the correction is performed. When the corrected reflected light pattern is q3i (i = 1, 2, ..., N), the corrected reflected light pattern q3i is obtained by the following equation (5). q3i = p3i / p3max (i = 1, 2, ..., N) (5)

When the maximum value retrieving means 11 outputs the maximum value p1max, the second correction calculating means 20 reads the correction value ratio r4 previously stored in the correction value ratio storing means 19, and the first storing means 7- The reflected light patterns p4i stored in 2 to 7-n are corrected according to the following equation (6), and the corrected reflected light patterns q4i are output. q4i = p4i / (r4 × p3max) (6) FIG. 7 shows a result of correcting the detection pattern of FIG. That is, FIG. 7A shows the pattern output from the first correction calculation means 18, and FIG. 7B shows the second correction calculation means 2.
It is a pattern output from 0.

The correction value ratio r4 is a value stored by the output of the adjustment medium when the paper sheet discriminating apparatus is assembled and shipped. That is, r4 is a value obtained by the adjusting medium having a high reflectance, and is greatly influenced by the sensitivity of the photoelectric conversion element forming the detecting means 1. In order to obtain such a correction value ratio r4, first, the output of the detection means 1-1 when the adjustment medium having a high reflectance is scanned at the time of shipping is set to w3,
Assuming that the outputs of the detecting means 1-2 to 1-n are w4, the correction value ratio r4 is obtained by the following equation (7). r4 = w4 / w3 (7) Then, the correction value ratios r4 thus obtained are stored in the correction value ratio storage means 19-1 to 19-n, respectively. Therefore, the correction value ratios stored in the respective correction value ratio storage means 19 indicate the correction value ratios for the connected detection means 1-2 to 1-n.

As described above, the data of the reflected light pattern corrected by the first correction calculation means 18 and the second correction calculation means 20 is stored in the second storage means 10.
The reflected light pattern stored in the second storage unit 10 is output to the denomination determination unit 5 and the true / false determination unit 6 to perform the denomination determination and the true / false determination. Since it is similar to the example, the description here is omitted.

In the above first and second embodiments, in order to correct the change in the sensitivity of the detecting means, focusing on the maximum value of the detection pattern, first, the maximum value (or the maximum value of one detection pattern) is detected. (Minimum value) is calculated, and then the correction calculation of other detection patterns is performed using the correction value ratio stored in advance, but it is also possible to correct the change in sensitivity by focusing on the entire detection pattern. The third embodiment will be described below.

<< Third Embodiment >> In the third embodiment, first, an integral value of one detection pattern is obtained, and then a correction value ratio in which correction calculation of another detection pattern is stored in advance is used. It is something to do. FIG. 8 is a block diagram showing a third embodiment of the paper sheet discriminating apparatus according to the present invention. In the figure, detection means 1 (1-1 to 1-n) and first storage means 7
(7-1 to 7-n), the second storage means 10, the denomination determination means 5, and the authenticity determination means 6 are the same as those in the first and second embodiments, and therefore the description thereof is omitted here. To do.

The first correction means 21 is connected to the first storage means 7-1, and the first storage means 7-2 to 7-n.
The second correction means 22-1 to 22-n are connected to each of them. The first correction means 21 is the integral value calculation means 2
3 and the first correction calculation means 24. The integral value computing means 23 inputs the detection pattern from the first storage means 7-1 and outputs the integral value to the first correction computing means 24 and the second correction computing means 26. The first correction calculation means 24 performs correction calculation of the reflected light pattern stored in the first storage means 7-1 based on the integrated value calculated by the integrated value calculation means 23.

The second correction means 22 includes the correction value ratio storage means 25 (25-1 to 25-n) and the second correction calculation means 2
6 (26-1 to 26-n). The correction value ratio storage means 25 includes a specific detection means 1-1 and other detection means 1-2.
Is a non-volatile memory that stores the ratio of the outputs of 1 to n, and the second correction calculation means 26 is based on the value of the correction value ratio storage means 25 and the output of the integral value calculation means 23, respectively.
The correction calculation of the reflected light pattern stored in the first storage means 7-2 to 7-n is performed. The correction value ratio stored in the correction value ratio storage means 25 will be described later.

Next, the operation of the paper sheet discriminating apparatus having the above construction will be described. First, the reflected light patterns of the bills are detected by the detection means 1-1 to 1-n and stored in the first storage means 7-1 to 7-n, respectively. Similar to the example.

FIG. 9 shows an example of the reflected light pattern output from each detecting means 1. In FIG. 9, (a) shows the stored contents of the first storage means 7-1 and shows the reflected light pattern p5i. Further, (b) shows the first storage means 7-
The reflected light pattern p6i is shown by the stored contents of 2 to 7-n. The reflected light pattern shown in FIG. 9 is a waveform obtained by sampling and quantizing the reflected light pattern when a bill is scanned in the direction of the arrow in the figure. The first correction calculation means 24 performs the correction as follows. That is, the reflected light pattern p5i is corrected by performing an operation so that the integrated value p5int becomes 1 after correction. When the corrected reflected light pattern is q5i (i = 1, 2, ..., N), the corrected reflected light pattern q5i is obtained by the following equation (8). q5i = p5i / p5int / n (i = 1, 2, ..., N) (8)

The second correction calculation means 26 reads the output of the integrated value p5int from the integration value calculation means 23 and the correction value ratio r6 stored in advance in the correction value ratio storage means 25,
The reflected light pattern p6i stored in the first storage means 7-2 to 7-n is corrected as in the following equation (9), and the corrected reflected light pattern q6i is output. q6i = p6i / (r6 × p5int / n) (9) FIG. 10 shows the result of correcting the detection pattern of FIG. That is, FIG. 10A shows a pattern output from the first correction calculation means 24, and FIG. 10B shows a pattern output from the second correction calculation means 26.

The correction value ratio r6 is a value stored by the output of the adjustment medium when the paper sheet discrimination apparatus is assembled and shipped. That is, r6 is a value obtained by the adjusting medium having a high reflectance, and is greatly influenced by the sensitivity of the photoelectric conversion element forming the detecting means 1. In order to obtain such a correction value ratio r6, first, the output of the detection means 1-1 when the adjustment medium having a high reflectance is scanned at the time of shipping is set to w5,
Assuming that the outputs of the detecting means 1-2 to 1-n are w6, the correction value ratio r6 is obtained by the following equation (10). r6 = w6 / w5 / n (10) Then, the correction value ratios r46 thus obtained are stored in the correction value ratio storage means 25-1 to 25-n, respectively. Therefore, the correction value ratios stored in the respective correction value ratio storage means 25 indicate the correction value ratios for the connected detection means 1-2 to 1-n.

In this way, the data of the reflected light pattern corrected by the first correction calculation means 24 and the second correction calculation means 26 is stored in the second storage means 10.
The reflected light pattern stored in the second storage means 10 is output to the denomination determination means 5 and the true / false determination means 6 to perform the denomination determination and the true / false determination. Since the second embodiment is similar to the second embodiment, the description thereof is omitted here.

In the third embodiment, the value integrated over a certain detection pattern is used as a reference.
Sample timing i = in the reflected light pattern p5i
The same effect can be obtained by a method in which a value obtained by integrating a part of a certain detection pattern is used as a reference, such as an integrated value of a pattern in the range of 10 to 20.

Further, in each of the above-described embodiments, it is clear that the constituent elements of the respective parts are constituted by the logic circuit, but it is also clear that they can be constituted by the combination of the program by the microcomputer and the logic circuit.
Further, in each of the above-described embodiments, the bill discriminating device in which the medium is a bill has been described, but the present invention is not limited to this, and is applicable to a paper sheet discriminating device for discriminating paper sheets other than bills.

[0050]

As described above, according to the paper sheet discriminating apparatus of the first invention, the maximum value and the minimum value of the output of the specific detecting means for detecting the physical pattern of the medium are obtained. And correct the output value of the specific detection means based on these maximum and minimum values, and for the outputs of the other detection means, the correction value ratio calculated in advance and the specific detection means. Since the correction calculation is performed based on the maximum value and the minimum value of the output of the, it is less susceptible to environmental changes such as sensitivity and offset of the detection element that configures the detection means and aging, and for example, denomination discrimination of banknotes The true and false discrimination can be performed with high accuracy.

Further, according to the paper sheet discriminating apparatus of the second invention, the maximum value of the output of the specific detecting means for detecting the physical pattern of the medium is searched, and based on this maximum value. The output value of the specific detection means is corrected, and the output of the other detection means is corrected based on the correction value ratio calculated in advance and the maximum value of the output of the specific detection means. Therefore, in addition to the effect of the first invention, when the dark current of the detection means is less susceptible to environmental changes, aging changes, etc., the configuration of the device can be simplified and cost can be reduced. it can.

Further, according to the paper sheet discriminating apparatus of the third invention, the integrated value of the output of the specific detecting means for detecting the physical pattern of the medium is calculated, and based on this integrated value. The output value of the specific detection means is corrected, and the output of the other detection means is corrected based on the correction value ratio calculated in advance and the integrated value of the output of the specific detection means. Therefore, in addition to the effect of the first invention, even if a value greater than or equal to the original maximum value is output due to a temporary abnormality of the detection element of the specific detection means, the influence of this maximum value is small. Further, it is possible to perform discrimination with higher accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of a paper sheet discriminating apparatus of the present invention.

FIG. 2 is a block diagram of a conventional paper sheet discrimination apparatus.

FIG. 3 is an explanatory diagram of a detection pattern before correction by the detection unit in the first embodiment of the paper sheet discrimination apparatus of the present invention.

FIG. 4 is an explanatory diagram of a detection pattern after correction by the detection means in the first embodiment of the paper sheet discrimination apparatus of the present invention.

FIG. 5 is a block diagram of a second embodiment of the paper sheet discriminating apparatus of the present invention.

FIG. 6 is an explanatory diagram of a detection pattern before correction by the detection means in the second embodiment of the paper sheet discrimination apparatus of the present invention.

FIG. 7 is an explanatory diagram of a detection pattern after correction by the detection means in the second embodiment of the paper sheet discrimination apparatus of the present invention.

FIG. 8 is a block diagram of a third embodiment of the paper sheet discriminating apparatus of the present invention.

FIG. 9 is an explanatory diagram of a detection pattern before correction by the detection unit in the third embodiment of the paper sheet discrimination apparatus of the present invention.

FIG. 10 is an explanatory diagram of a detection pattern after correction by the detection unit in the third embodiment of the paper sheet discrimination apparatus of the present invention.

[Explanation of symbols]

1-1 to 1-n detection means 5 denomination determination means 6 true / false determination means 8, 16, 21 first correction means 9-1 to 9-n, 17-1 to 17-n, 22-1 to 22
-N second correction means 11 maximum value search means 12 minimum value search means 13, 18, 24 first correction calculation means 14-1 to 14-n, 19-1 to 19-n, 25-1 to
25-n, correction value ratio storage means 15-1 to 15-n, 20-1 to 20-n, 26-1 to
26-n, second correction calculation means

Claims (3)

[Claims] 1. A plurality of detection means for detecting physical patterns at a plurality of locations on a medium are provided, and the outputs from the plurality of detection means are respectively corrected, and the medium is discriminated based on the corrected values. In the paper sheet discriminating apparatus for performing, one of the plurality of detecting means is a specific detecting means, a maximum value searching means for detecting a maximum value of the detection output of the specific detecting means, and detection of the specific detecting means. A minimum value search means for detecting the minimum value of the output, based on the maximum value and the minimum value detected by the maximum value search means and the minimum value search means, a first value for correcting the output value of the specific detection means Correction value calculation means, correction value ratio storage means connected to detection means other than the specific detection means, and storing a ratio of correction values calculated in advance between the specific detection means and other detection means, and the correction value Ratio storage means And a second correction calculation means for correcting the output value of the detection means other than the specific detection means, based on the maximum value and the minimum value detected by the maximum value search means and the minimum value search means, A paper sheet discriminating apparatus comprising: the first correction arithmetic means and a discrimination means for discriminating a medium based on an output from the second correction arithmetic means. 2. A plurality of detection means for detecting physical patterns at a plurality of locations on the medium are provided, and the outputs from the plurality of detection means are respectively corrected, and the medium is discriminated based on the corrected values. In the paper sheet discriminating apparatus for performing, one of the plurality of detecting means is a specific detecting means, a maximum value searching means for detecting a maximum value of the detection output of the specific detecting means, and the maximum value searching means detects the maximum value. A first correction calculation means for correcting the output value of the specific detection means based on the determined maximum value, and the specific detection means which is connected in advance to the detection means other than the specific detection means and which is calculated in advance Correction value ratio storage means for storing the ratio of the correction values of the detection means, the value of the correction value ratio storage means, and the maximum value detected by the maximum value search means, detection other than the specific detection means. means It is characterized by comprising a second correction calculation means for correcting the output value, the first correction calculation means, and a discrimination means for discriminating the medium based on the output from the second correction calculation means. Paper sheet discrimination device. 3. A plurality of detecting means for detecting physical patterns at a plurality of locations on the medium are provided, and outputs from the plurality of detecting means are respectively corrected, and the medium is discriminated based on the values after the correction. In the paper sheet discriminating apparatus for performing, one of the plurality of detecting means is a specific detecting means, an integral value calculating means for calculating an integral value of a detection output of the specific detecting means, and a value of the integral value calculating means. Based on the above, a first correction calculation means for correcting the output value of the specific detection means, and a correction of the specific detection means connected in advance to the detection means other than the specific detection means and the detection means A correction value ratio storage means for storing a ratio of values, a value of the correction value ratio storage means, and an output value of a detection means other than the specific detection means based on an integrated value output from the integrated value calculation means. Second correction to correct And calculation means, the first correction arithmetic means, the second correction based on the output from the operation means performs the discrimination of the medium discrimination means and the sheet discriminating apparatus characterized by comprising a.