JP2000163584A - Device for identifying paper sheets - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable identifying with high precision in spite of the occurrence of a cutting deviation or a transportation slip in paper sheets by permitting feature data extracted from respective sensor outputs to be the ones at a same place in the case of executing identification by means of the plural sensor outputs. SOLUTION: A position with the largest or smallest output waveform is made to be a feature position at every section from one kind of output waveform of the sensor, which is obtained at every section in accordance with the transportation quantity of the paper sheets (S4), another kind of output of the sensor at the feature position is obtained as feature data (S5) and the paper sheets are identified by using the feature data. Thus, the two kinds of sensor detection outputs become detection values at the same feature position the, influence of the position deviation or the transportation slip of the paper sheets is eliminated.

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 for discriminating the type of paper sheets to be conveyed and the quality of the conveyed sheets.

[0002]

2. Description of the Related Art FIG. 6 shows an example of such a conventional paper sheet identification apparatus. The transport means 1 is a sheet 7 to be identified.
The conveyance amount detection means 2 detects the conveyance amount of the conveyance means 1, and the waveform acquisition means 3 reflects the reflected light or transmitted light from the paper sheet 7 according to the conveyance amount detected by the conveyance amount detection means 2. Is obtained as a waveform.
The section setting means 4 sets a plurality of sections in the waveform acquired by the waveform acquiring means 3, and the identification means 5 extracts characteristic data in each section and performs identification based on the characteristic data.

FIG. 7 shows a processing flow in such a conventional apparatus. In the conventional apparatus, in order to correctly extract the characteristic data even when the sheet 7 is cut off or the conveyance slip occurs, in step 5 (hereinafter, referred to as S5) in FIG.
In each section set by the section setting means 4, a method of extracting at least one piece of data of a section maximum value, a section minimum value, and a section average value as feature data has been used. Japanese Patent Laying-Open No. 6-84043 discloses an example of such a conventional apparatus.

FIG. 3 shows an example of a paper sheet 7. FIG. 3 (a)
(A) is a part of the paper sheet 7, the ink having the transmittance-wavelength characteristic shown in the upper part of FIG. Inks having the transmittance-wavelength characteristics shown in the lower part of FIG. 3 (b) are printed. Here, the part B refers to the entire rectangle defined by B1 and B2, and is B2-B from the side of B0-B1.
The transmittance shown in the lower part of FIG.
Ink having wavelength characteristics is printed with gradation in a rough → dense relationship.

[0005]

When the paper sheet 7 shown in FIG. 3 is to be identified by the conventional apparatus shown in FIG. 6, for example, the sensor 6 "'is a transmission type sensor having a wavelength λ1. If there is, the sensor output with respect to the transport amount is as shown in FIG.
The waveform shown in the upper part of FIG. The lower part of FIG. 8A shows the printing status of the paper sheet 7. However, in this example, for example, as shown in FIG. 8B, even when there is no gradation printing on the paper sheet 7, the sensor output has the same waveform, and the discrimination ability is low.

On the other hand, in order to improve the identification accuracy, it is conceivable to obtain a plurality of outputs from one sensor or a plurality of sensors. For example, as shown in FIG.
And a transmission sensor 6 ′ having a wavelength of λ2. In this case, FIG.
The waveform of the sensor output corresponding to the carry amount as shown in FIG. In the conventional processing flow shown in FIG.
In the second section, the section minimum value is extracted as the feature data from the waveform of the sensor 6, and the section maximum value or the minimum value is extracted as the feature data from the waveform of the sensor 6 '. Therefore, the output at the position where the carry amount is α is obtained from the sensor 6 as the characteristic data, and the output at the position of α ′ or α ″ is obtained as the characteristic data from the sensor 6 ′. And the sensor 6 "obtains characteristic data from different places. Therefore, it has not been possible to cope with a case where identification is to be performed using information on a specific place of a paper sheet. That is, if there is a misalignment or a conveyance slip of the paper sheet, correct identification cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. In a case where identification is to be performed using a plurality of sensor outputs, feature data extracted from each sensor output is stored in the same location. It is an object of the present invention to provide a paper sheet identification device capable of performing highly accurate identification even if a cutting error or a conveyance slip of the paper sheet occurs by making the sensor output of the paper sheet.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a sheet identification apparatus for identifying a sheet by detecting transmitted light or reflected light from the sheet. At least one sensor for obtaining two or more types of outputs, a conveying unit for conveying the paper sheet, a conveying amount detecting unit for detecting a conveying amount of the conveying unit, and an output of each of the sensors. Waveform acquisition means for acquiring a waveform for each predetermined section according to the transport amount, and a characteristic position for obtaining, as a characteristic position, a position at which one type of output predetermined for each section is maximum or minimum in the section The apparatus includes a determining unit and an identifying unit that acquires at least one type of output at the characteristic position as characteristic data and identifies a sheet using the characteristic data. In this configuration,
Based on one type of output waveform of the sensor acquired for each section corresponding to the transport amount of the sheet, a position that is the maximum or minimum in each section is defined as a characteristic position, and at least one type of output of the sensor at this characteristic position is characterized. The data is acquired as data, and the paper sheet is identified using the characteristic data. As a result, the two types of sensor detection outputs become the detection values at the same characteristic position, so that the sheet is not affected by the positional deviation of the sheet or the slip of the conveyance, and the sheet can be accurately identified.

Further, the identification means may identify a paper sheet using feature data obtained from the plurality of sections. As a result, paper sheets can be identified with higher accuracy. Further, the characteristic position determining means uses two or more types of outputs instead of one type of output predetermined for each section, and determines a position where a calculation result based on those outputs is maximum or minimum in the section. The characteristic position may be obtained, and the identification unit may acquire at least one type of output at the characteristic position which is predetermined as characteristic data. As a result, the characteristic position can be obtained more accurately. Further, the calculation may be for obtaining a sum or a difference of two or more types of outputs.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a configuration of a paper sheet identification apparatus according to an embodiment of the present invention. The paper sheet identification device includes a conveyance unit 1 for conveying the paper sheet 7, a conveyance amount detection unit 2 for detecting a conveyance amount of the paper sheet 7, and a light beam projected on the paper sheet 7 and reflected light thereof. And the waveform acquisition for acquiring output waveforms of the sensors 6 and 6 ′ for each predetermined section corresponding to the transport amount by the transport amount detecting means 2. It comprises a means 3, a section setting means 4 for setting a predetermined section, and an identification means 5 for identifying a sheet from the output of each of the sensors 6, 6 '. Then, the identification means 5 determines, as a characteristic position, a position where one type of output of the sensors 6 and 6 ′ predetermined for each section is maximum or minimum in the section (characteristic position determining means). At least one type of output at the characteristic position is obtained as characteristic data, and the characteristic data is used to identify a paper sheet.

FIG. 2 shows a processing flow of the paper sheet identification apparatus having the above-described configuration. The section setting means 4 stores the number N of sections in advance.
And section setting information, and the initial value 1 of the number n of processed sections
(Step 1; described as S1; hereinafter the same). The paper sheet 7 is transported by the transport unit 1, and the sensors 6, 6 ′ according to the transport amount detected by the transport amount detection unit 2
Is acquired by the waveform acquisition means 3 as a waveform (S
2). If n> N is not satisfied (NO in S3), the sensor 6,
The characteristic position of the section is determined based on the output of 6 ′, and characteristic data is acquired based on the output at this characteristic position (S4 to S6). Further, n = n + 1 (S6), and S3
When n> N (YES in S3), a paper sheet identification process is executed based on the characteristic data (S7).

The acquisition of characteristic data is performed as follows. Now, it is assumed that the n (<N) th section is being processed. As the n-th section, a part of (a) of the paper sheet 7 shown in FIG. 3A is set and processed as shown in FIG.
First, the position of the transport amount α at which the output of the sensor 6 becomes the minimum value is determined as the characteristic position (S4). Next, in the outputs of the sensors 6 and 6 ′, the output at the conveyance position α is acquired as feature data (S5). Then, the process proceeds to the next section (S6).

FIG. 5 shows the configuration of a paper sheet identification apparatus according to another embodiment of the present invention. The sensor 6 ″ is a sensor that can obtain two types of outputs from one sensor, and, for example, independently obtains S-polarized light and P-polarized light. This sensor output is provided to the waveform obtaining means 3. The configuration is the same as that of the first embodiment.

The present invention is not limited to the configuration of the above embodiment, and various modifications are possible. For example, the identification means 5
Sheets may be identified using feature data obtained from a plurality of sections. As a result, paper sheets can be identified with higher accuracy. In addition, the above-described feature position determination is performed by:
Instead of one type of sensor output predetermined for each section, two or more types of sensor outputs are used, and a position at which a calculation result based on those outputs is maximum or minimum in the section is determined as a characteristic position. At least one type of sensor output predetermined at the position may be obtained as feature data. As a result, the characteristic position can be obtained more accurately, and the paper sheets can be identified with high accuracy. In addition, the above calculation may be performed to obtain the sum or difference of two or more types of outputs.

[0015]

As described above, according to the paper sheet identification apparatus according to the present invention, the position where one type of output of the sensor predetermined for each section is maximum or minimum in the section is defined as the characteristic position. , And at least one type of output at the characteristic position is obtained as characteristic data, and sheets are identified based on the characteristic data. Therefore, even when identification is to be performed using a plurality of sensor outputs, each sensor output is determined. Is output from the sensor at the same location, and it is possible to perform highly accurate identification even if a cutting error or a conveyance slip occurs in a sheet. Further, by identifying the paper sheet using the characteristic data obtained from the plurality of sections, more accurate identification becomes possible. Further, the position where the operation result of two or more types of outputs predetermined for each section is the maximum or the minimum in the section is determined as the characteristic position, and the paper sheet is identified using the characteristic data at this characteristic position. By doing
When trying to identify by multiple sensor outputs,
More appropriate and highly accurate identification becomes possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a paper sheet identification device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing flow of the paper sheet identification apparatus.

FIG. 3A is a diagram illustrating an example of a paper sheet identified by the paper sheet identification device, and FIG. 3B is a view illustrating a portion A of the ink A printed on the paper sheet of FIG. It is a transmittance-wavelength characteristic diagram.

FIG. 4 is a diagram illustrating two types of sensor outputs with respect to a transport amount of a paper sheet and a section of the paper sheet.

FIG. 5 is a configuration diagram of a paper sheet identification device according to another embodiment of the present invention.

FIG. 6 is a configuration diagram illustrating an example of a conventional paper sheet identification device.

FIG. 7 is a flowchart of a process in a conventional device.

FIG. 8 is a diagram illustrating a sensor output with respect to a transport amount of a sheet and a section of the sheet in the conventional apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyance means 2 Conveyance amount detection means 3 Waveform acquisition means 4 Section setting means 5 Identification means (also a feature position determination means) 6, 6 'sensor 7 Paper sheets

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Naruto Yasuda, Inventor: No. 10, Hanazono Todocho, Ukyo-ku, Kyoto-shi, Kyoto O Inside the Murron Co., Ltd. F-term in Muron Co., Ltd. (reference) 3E041 AA10 BA11 BB02 BB03 CA01 DA01 5B047 AA04 AB02 BA01 BB01 BC01 5B057 AA11 BA02 BA12 CA08 CA11 CC02 DA07 DA08 DA12 DB01 DB09 DC22 DC36

Claims (4)

[Claims] 1. A sheet identification apparatus for identifying a sheet by detecting transmitted light or reflected light from the sheet, comprising: at least one sensor for obtaining two or more types of outputs as information of the sheet. Conveying means for conveying the paper sheet; conveying amount detecting means for detecting the conveying amount of the conveying means; and a waveform for acquiring a waveform for each predetermined section corresponding to the conveying amount from each output of the sensor. Acquisition means; Feature position determination means for obtaining, as a feature position, a position at which one type of output predetermined for each section is maximum or minimum in the section; and At least one type of output at the feature position. A paper sheet identification apparatus, comprising: identification means for acquiring data as data and identifying the paper sheet using the characteristic data. 2. The paper sheet identification apparatus according to claim 1, wherein the identification means identifies the paper sheet using characteristic data obtained from the plurality of sections. 3. The feature position determining means uses two or more types of outputs instead of one type of output predetermined for each section, and calculates a calculation result based on those outputs as a maximum or a minimum in the section. 3. The paper sheet according to claim 1, wherein the position is determined as a characteristic position, and the identification unit acquires at least one type of predetermined output at the characteristic position as characteristic data. 4. Identification device. 4. The paper sheet identification device according to claim 3, wherein the calculation obtains a sum or a difference of two or more types of outputs.