JPH0523280U - Paper sheet identification device - Google Patents

Abstract

(57) [Summary] [Purpose] To properly adjust the accuracy of true / false judgment for each section of the paper sheet. [Structure] A plurality of sets of reference pattern data, each set of reference data set in advance corresponding to a plurality of sections of a sheet, are stored for the same type of sheet, and one set of the reference pattern data is stored. select. The selected reference pattern data and the feature detection data of the sheet to be inspected are compared for each section to determine the suitability. Since the reference pattern has the reference data set appropriately for each section, appropriate determination accuracy adjustment can be performed for each section according to the selected reference pattern.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper sheet discriminating apparatus for discriminating the authenticity of paper sheets such as banknotes, cash vouchers, gift cards, securities, etc., and particularly, to enable precision switching of a reference pattern for authenticity determination. Regarding what you did.

[0002]

[Prior Art]

 In the paper sheet identification device, when a paper sheet is inserted, automatic insertion / conveyance of the inserted paper sheet is started, and the paper sheet output from the paper sheet characteristic detection sensor is in the process of the conveyance. And the predetermined authenticity determination reference data are compared. In order to inspect the characteristics of paper sheets in a wide range, the paper sheet is divided into a plurality of sections, and a judgment reference pattern composed of reference data for authenticity judgment corresponding to each section is used. Then, the detection data of each section and the reference data are compared with each other, and it is checked whether or not the judgment criteria are satisfied. Based on this, the authenticity of the inserted paper sheet is judged. In this case, the accuracy of authenticity determination depends on how the reference data is taken. However, in the conventional sheet identification device, only one reference pattern data is prepared, and it is possible to freely switch the reference pattern data for adjusting the judgment accuracy. It wasn't. For example, in Japanese Unexamined Patent Publication No. 60-61883, the maximum value of the detection data is set to the maximum value of the reference data in order to prevent the determination accuracy from being lowered due to the level of the detection data fluctuating due to the degree of soiling of the sheet and the degree of fatigue. It is shown that the correction rate is determined so as to match the maximum value, and the value of the detection data of each section is corrected according to the correction rate. In this case, the reference data is fixed, and the determination accuracy is adjusted by correcting the value of the detection data according to the degree of contamination.

[0003]

[Problems to be solved by the device]

 A situation in which the adjustment of the judgment accuracy is required is considered to be the secular change in the sensitivity of the paper sheet feature detection sensor. In other words, due to fluctuations in the sensor sensitivity, a situation may occur in which a genuine note is erroneously determined as a counterfeit note, or conversely, a counterfeit note is mistakenly accepted as a genuine note. In addition, adjustment of the determination conditions may be required depending on the usage conditions of the paper sheet identification device. For example, if the paper sheet identification device is used in a place where a false note is likely to be used, it is preferable to adjust the accuracy so that the determination condition is set relatively severely. In any case, such as when the sensor sensitivity fluctuates or when it is necessary to adjust the judgment accuracy according to the usage conditions, it is not appropriate to adjust the accuracy at a uniform rate for all sections of the paper sheet. Instead, it is desirable to be able to make appropriate precision adjustments for each section. The present invention has been made in view of the above points, and an object of the present invention is to provide a paper sheet identification apparatus capable of performing appropriate determination accuracy adjustment.

[0004]

[Means for Solving the Problems]

 A paper sheet identification device according to the present invention detects a feature of the paper sheet in response to insertion of the paper sheet, and a detection unit that outputs detection data corresponding to a plurality of sections of the paper sheet. The storage means storing a plurality of sets of reference pattern data, each set of reference data set in advance corresponding to the plurality of sections, for the same type of sheet, and a set of reference patterns from the storage means. A selection means for selecting data, and a judgment means for judging suitability by comparing the reference pattern data selected by the selection means and the detection data obtained by the detection means for each section. Is.

[0005]

[Action]

 A plurality of sets of reference pattern data for the same type of paper are stored in the storage means, and one set of the reference pattern data is selected by the selection means and used as a judgment reference. One set of reference pattern data consists of one set of reference data set in advance corresponding to multiple sections, and the value of the reference data for each section is arbitrarily set for each pattern. Is. Therefore, selecting the desired reference pattern data does not mean uniform determination accuracy adjustment for each section, but appropriate accuracy adjustment is made independently for each section according to the selected pattern. I mean that.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In FIG. 1, the optical characteristics of the inserted paper sheets are read by a photo sensor 1 which is one of the characteristic detection sensors. The read characteristic is sent to the amplifier circuit 2 as a detection data signal, amplified, and then input to the central processing unit (CPU) 5. The magnetic head 3 is also one of the characteristic detection sensors, detects the magnetic characteristics of the inserted sheet, and the detection data signal is input to the CPU 5 via the amplifier circuit 4. A program ROM 6 and data and a working RAM 7 are provided in relation to the CPU 5, and the processing for determining the authenticity of the inserted sheet based on the output of each of the above characteristic detection sensors and the authenticity determination result are performed. Various processes such as fetching of genuine paper sheets inserted based on the above and returning of counterfeit papers are executed according to the software program.

The reference data memory 8 stores a plurality of sets of reference pattern data including a set of reference data set in advance corresponding to a plurality of sections of a paper sheet for the same type of paper sheet. Such plural sets of reference pattern data may be stored respectively for plural kinds of paper sheets. The reference pattern selection switch 9 is a switch for selecting one set of reference pattern data from the reference data memory 8. A set of reference pattern data selected by operating the switch 9 is read from the reference data memory 8 and taken into the judgment reference data memory in the RAM 7. In the process of determining the authenticity of the inserted sheet, the set of standard pattern data stored in the determination reference data memory in the RAM 7 is compared with the detection data. The selection switch 9 is, of course, provided inside the identification device so that the administrator can operate it.

Next, an example of processing executed by the CPU 5 will be described with reference to the flowchart in FIG. First, a predetermined initial process is performed. Next, one set of reference pattern data selected by the reference pattern selection switch 9 is read out from the reference data memory 8 and taken into the judgment reference data memory in the RAM 7 (step 10). Next, it is checked whether a paper sheet has been inserted (step 11). If NO, it is checked with the selection switch 9 whether the reference pattern selection operation has been performed (step 12). If this is also NO, the process returns to step 11. In the standby state, the routine of NO in step 11 and NO in step 12 is repeated.

When the reference pattern selection switch 9 is operated by the administrator, YES is determined in step 12 and the process proceeds to step 13 where the stacker (a stacking unit for collecting the received paper sheets) is the identification device. Check if it was set to. In the next step 14, it is checked whether the power switch has been reset. If the stacker is set or the power switch is reset, go to step 10. As a result, one set of reference pattern data selected by operating the reference pattern selection switch 9 is read from the reference data memory 8 and is stored in the judgment reference data memory in the RAM 7.

When the paper sheet is inserted into the identification apparatus, YES is determined in step 11, and the process goes to step 15 to perform the authenticity determination process. Here, the detection data given based on the outputs of the photo sensors 1 and the magnetic head 3 are compared with the reference pattern data stored in the determination reference data memory in the RAM 7 to make a true / false determination. U As is well known, the characteristic detection data of the inserted sheet (for example, the detection data of the magnetic head) is divided into a plurality of (36 as an example) determination sections, and the characteristic detection data for each section is obtained. One set of reference pattern data also has the same judgment reference data for each section, and the detection data and the judgment reference data are compared for each section. Then, if the detection data satisfies the reference data condition in all the sections, the inserted paper sheet is determined to be a genuine note. If the number of sections in which the detection data satisfies the reference data condition is a predetermined number or more, the inserted paper sheet may be determined to be a genuine note. When it is determined that the inserted paper sheet is a genuine note, the paper sheet is taken in and accumulated in the stacker. On the other hand, when the inserted paper sheet is determined to be a fake bill, the paper sheet is returned.

FIG. 3 shows an example of reference pattern data. In this example, two sets of reference pattern data are shown, and one set of reference patterns consists of an upper limit pattern and a lower limit pattern. The curve shown by the thick solid line is the reference pattern 1, and the curve shown by the thin solid line is the reference pattern 2. The shape of the curve is different between the reference pattern 1 and the reference pattern 2, and the range between the upper limit and the lower limit is also different. In the figure, an example of a curve of detection data is shown by a dotted line. In the case of this example, if the reference pattern 1 is selected, the detection data is within the upper and lower limit range of the reference pattern 1 in all sections, and it is definitely determined as a genuine note. On the other hand, if the reference pattern 2 is selected, the detection data exceeds the upper limit of the reference pattern 2 in a certain section range, and if the number of sections that does not satisfy the reference condition is larger than a predetermined number, it is determined as a counterfeit note. ..

In the example of FIG. 3, the reference pattern 2 is a stricter criterion than the reference pattern 1. So, for example, when the standard pattern 1 was selected and operated at the beginning, but when it was found that the use of counterfeit bills was high, the standard pattern 2 was switched to, and the strict judgment criterion condition was changed to use the counterfeit bills. There may be a way to use such that it can be strongly excluded. The reference patterns 1 and 2 have different pattern shapes. This is because there are some areas where it is easy to determine the authenticity and some areas where it is not, depending on the section of the paper sheet, and it means that the determination accuracy can be adjusted appropriately according to the section (section). For example, in the part (section) where the authenticity judgment is relatively easy, there is not so much difference in any pattern, but in the part (section) where the true / false judgment is to be performed strictly, it is relatively different for each pattern. Each pattern can be set appropriately. By making it possible to select and use different reference patterns in this way, the judgment accuracy can be adjusted according to the interval so that the specific part (interval) can be judged strictly or vice versa. Can be easily switched by switching the reference pattern.

In the above embodiment, one set of reference pattern data selected by operating the selection switch 9 is loaded into the determination reference data memory in the RAM 7 on condition that the stacker is set or the power switch is reset. There is. As a result, the reference pattern data is not switched simply by operating the selection switch 9, but the reference pattern data is switched when the administrator sets the stacker or resets the power supply. Certainly as it will be done. However, the present invention is not limited to this, and one set of reference pattern data selected according to the operation of the reference pattern selection switch 9 may be immediately taken into the judgment reference data memory in the RAM 7. In the above-described embodiment, various processes are performed by software, but it goes without saying that they can also be realized by hardware logic.

[0014]

[Effect of the device]

 As described above, according to the present invention, a plurality of sets of judgment reference patterns are prepared for the same type of paper sheets, and these are selected and used for judgment. It has an excellent effect that appropriate determination accuracy adjustment can be performed according to the above.

[Brief description of drawings]

FIG. 1 is a block diagram showing a hardware configuration of an embodiment of a paper sheet identification apparatus according to the present invention.

FIG. 2 is a flowchart showing an example of a processing procedure in the embodiment.

FIG. 3 is a diagram illustrating two different determination reference patterns.

[Explanation of symbols]

 1 ... Photo sensor for feature detection 3 ... Magnetic head for feature detection 2, 4 ... Amplification circuit 5 ... Central processing unit (CPU) 6 ... Program ROM 7 ... Data and working RAM 8 ... Reference data memory 9 ... Reference pattern selection switch

Claims (4)

[Scope of utility model registration request] 1. A detection unit that detects a characteristic of the paper sheet in response to insertion of the paper sheet and outputs detection data corresponding to a plurality of sections of the paper sheet, and Storage means for storing a plurality of sets of reference pattern data corresponding to a set of preset reference data corresponding to the same type of sheet; and selection means for selecting one set of reference pattern data from the storage means. A paper sheet discriminating apparatus comprising: a reference pattern data selected by the selection means and the detection data obtained by the detection means for each section, and a determination means for determining suitability. 2. The selecting means includes means for selecting a desired set, and means for reading out the selected set of reference pattern data from the storage means and loading it in a determination reference data memory. 1. The paper sheet identification device according to 1. 3. The paper sheet identification apparatus according to claim 2, wherein the determination reference data memory is loaded at the time of power reset. 4. The paper sheet identifying apparatus according to claim 2, wherein the determination reference data memory is loaded when the paper sheet stacking unit is set.