JP4629456B2 - Paper sheet discrimination device - Google Patents

Description

  The present invention relates to a paper sheet discriminating apparatus, and more particularly to a banknote discriminating apparatus that magnetically detects the authenticity of a paper sheet printed using magnetic ink such as a banknote.

  A banknote handling apparatus such as an automatic teller machine (ATM) used in a financial institution is provided with a discrimination function for determining the authenticity of a banknote. In order to determine the authenticity of a banknote, the banknote pattern is usually detected by detecting the pattern of the banknote using a magnetic sensor or an optical sensor, and comparing the detected pattern with a reference pattern. Yes.

  For example, Japanese Patent Application Laid-Open No. 2000-105847 (Patent Document 1) discloses a method of detecting a magnetic ink printed on a print medium using a magnetic sensor. A magnetic ink sensing magnetic sensor that can be detected is disclosed.

  Japanese Patent Laid-Open No. 2000-48237 (Patent Document 2) discloses a feature that can reduce the cost and the determination processing time by making it possible to detect a feature amount at a point according to the specification while easily adapting to the specification change. For shortening, a paper sheet discriminating apparatus is disclosed in which the sensor 2 includes a plurality of feature amount detection heads 11 for detecting feature amount information, and the feature amount detection heads 11 are detachably attached to a plurality of head mounting holes. Has been.

JP 2000-105847 A JP 2000-48237 A

  By the way, in order to prevent counterfeiting of banknotes, there are cases where the characteristics of magnetic ink used for printing banknotes are slightly similar, or various types of magnetic inks are used. In such a case, it is difficult to accurately and precisely detect the characteristics of the magnetic material used for printing the banknote with a single magnetic sensor.

  An object of the present invention is to determine authenticity of paper sheets having complicated magnetic characteristics. In particular, it is an object of the present invention to provide a true / false discrimination device that uses a plurality of magnetic sensors to detect different magnetic characteristics of a magnetic material printed on a paper sheet.

The paper sheet discriminating apparatus according to the present invention has a first sensor that detects the magnetic permeability of the magnetic material contained in the paper sheet, and a second sensor that detects the residual magnetization of the magnetic material contained in the paper sheet. And a paper sheet discriminating apparatus that uses the signals detected by the first sensor and the second sensor for discriminating paper sheets.
The paper sheet discriminating apparatus preferably includes a storage unit that preliminarily stores information relating to the residual magnetization of the magnetic material used in the paper sheet and determination information relating to the magnetic permeability used in the paper sheet, and the first or second. And a processing unit that collates the information of the signal detected by the sensor and the determination information stored in the storage unit, and determines the sheet according to the collation result in the processing unit.
In one example, the denomination and authenticity of the banknote are determined by collation in the processing unit.
In a preferred example, the first sensor is a line-type magnetic sensor that covers the entire conveyed paper sheet, and the second sensor is arranged to obtain a detection signal partially from the conveyed paper sheet. .
In one example, a transport roller for transporting the paper sheet is disposed in a direction perpendicular to the paper sheet transport direction and next to the second sensor.
In one example, at least one of the first or second sensors is an array of magnetic sensors having a dead zone.
In one example, the first sensor includes an exciting unit that excites a magnetic body included in the paper sheet.

  In the present invention, a plurality of storage units for sorting and storing the paper sheets processed by the processing unit, and switching for switching the transport path to transport the paper sheets to one of the plurality of storage units according to the processing result of the processing unit. For example, it is understood as a paper sheet handling apparatus such as an ATM using a paper sheet discriminating apparatus having a mechanism.

  According to the present invention, a plurality of types of magnetic characteristics printed on a paper sheet can be detected by a plurality of magnetic sensors, thereby improving the authenticity determination capability of the paper sheet.

Embodiments of the present invention will be described below with reference to the drawings.
Generally, the magnetic flux (magnetization) in the absence of an external magnetic field (Hex) is called residual magnetization (Br), and the ratio (B1 / Hex) of the external magnetic field Hex to the magnetic flux (B1) in the presence of Hex is transparent. This is called magnetic susceptibility. In order to give an external magnetic field to a bill, the magnet is excited with a magnet, and the residual magnetization Br and the magnetic permeability are detected with a magnetic sensor, so that the type of the magnetic material is distinguished.

  In this embodiment, as a plurality of magnetic sensors having different magnetic detection characteristics, a residual magnetization detection sensor and a permeability detection sensor are used, and information on magnetic characteristics can be obtained simply by transporting a banknote to the banknote discrimination device once. It is something to get. The banknote judgment ability is improved by completing the banknote transport once.

FIG. 1 is a configuration diagram of a bill discriminating apparatus in one embodiment.
A plurality of sets of rollers 12 and 13 are arranged in the conveyance path 10 for conveying the banknote 1. The roller 13 is a banknote transport roller, and magnetic sensors 15 and 16 for detecting magnetic properties printed on the banknote 1 are arranged at positions opposite to the roller 12. Here, the magnetic sensor 15 is a sensor for detecting magnetic permeability, and the magnetic sensor 16 is a sensor for detecting residual magnetism. The magnetic sensor 15 has a built-in magnet 151 for exciting the magnetic body 106 in the banknote 1 and detects a magnetic characteristic different from that of the magnetic sensor 16. The magnetic body 106 is used for a security thread.

  As the material of the rollers 12 and 13, for example, an elastic material such as rubber or sponge is used, and the roller 12 presses the banknote 1 in close contact with or close to the magnetic sensors 15 and 16. Of course, the gap between the banknote 1 and the roller 12 is not in close contact, and a gap that allows the banknote 1 to pass through may be secured.

  When the banknote 1 and the magnetic sensor 16 are brought into close contact with each other, the distance between the two is kept constant, and fluctuations in sensor output due to variations in the passing position of the banknote 1 can be suppressed. On the other hand, when a gap is formed between the roller 12 and the magnetic sensor 16, the collision between the banknote 1 and the magnetic sensor 16 is alleviated, and the sensor noise due to mechanical shock is alleviated.

  In this embodiment, the magnet 151 is used. However, the present invention is not limited to this, and an exciting coil may be used as another means for exciting the magnetic body 106. When a magnet is used, the structure is simple and a magnetic sensor can be constructed at low cost. On the other hand, when an exciting coil is used, the intensity of the exciting magnetic field can be controlled, and an exciting magnetic field suitable for detecting banknotes to be handled can be set.

Detection signals obtained by the magnetic sensors 15 and 16 are amplified by the amplification circuits 171 and 172, respectively, and sent to the control device 18. The control device 18 is actually a printed wiring board for control that constitutes a banknote discrimination device.
The control device 18 includes a multiplexer 181, an AD converter 182, a storage unit 183, and a processing unit 184. The multiplexer 181 selects either the amplifier circuit 171 or 172 based on the switching signal from the processing unit 184. The AD converter 182 converts the received analog state detection signal into a digital signal. The storage unit 183 is a semiconductor memory such as a flash memory or a storage device such as a hard disk, and stores therein determination information as reference information used for determining the authenticity of banknotes. The stored determination information includes permeability determination information 1831 and residual magnetization determination information 1832 (see FIG. 2). Needless to say, the determination information is prepared in the storage unit 183 for each denomination of banknotes.
The processing unit 184 includes a processor, compares the magnetic information of the magnetic sensor 15 or 16 sent from the AD converter 182 with the determination information 1831 or 1832 stored in the storage unit 183, and as a result of the comparison, the determination result 19 is output. The determination result 19 includes information on the denomination of the banknote and authentic information.

FIG. 2 shows a functional block diagram of the bill discriminating apparatus shown in FIG.
The processing unit 184 compares the magnetic information obtained from the magnetic sensor 15 with the magnetic permeability determination information 1831 stored in the storage unit 183, and executes a program execution process 1841 for determining the characteristics of the magnetic permeability of the bill, and the magnetic A program execution process 1842 for comparing the magnetic information obtained from the sensor 16 with the residual magnetism determination information 1832 to determine the characteristics of the residual magnetization, and the results of these two types of execution processes 1841 and 1842 are received. A program execution process 1849 for determining the denomination and authenticity is performed.
Each program for performing the above-described execution process is stored in the storage unit 183 or another storage unit, and is loaded into the processing unit 184 and executed when the program is executed.

FIG. 3 is a plan view showing an arrangement relationship of magnetic sensors in the bill discriminating apparatus.
Each of the magnetic sensors 15 and 16 is a line-type detector, and is arranged in a direction perpendicular to the conveyance direction A of the banknote 1. The length of the magnetic sensor 15 for permeability detection is larger than the length L of the banknote, and magnetic information from the entire banknote 1 can be collected.
On the other hand, the magnetic sensor 16 for detecting residual magnetization is shorter than the length of the bill and covers the magnetic detection range S. This is because the magnetic sensor 16 is arranged for the purpose of detecting the magnetic body 106 and only needs to cover a predetermined range S where the magnetic body 106 of the banknote is likely to exist.

  The arrangement of the magnetic sensor shown in FIG. 3 does not represent FIG. 1 simply as a plan view. In the example of FIG. 3, consideration is given to the improvement of the mounting efficiency of the roller in the bill discriminating apparatus and the possibility of mounting other components. That is, in the example of FIG. 1, the magnetic sensor 16 and the opposing roller 12 are disposed between the transport rollers 13 in the transport path 10. In addition, a plurality of optical sensors are required. However, in order to arrange the magnetic sensor and the optical sensor in a limited place between the transport rollers 13, it is necessary to secure a mounting space for these sensors, but it is very difficult in practice.

Therefore, in the example of FIG. 3, the transport roller 13 ′ is disposed on the extension of the magnetic sensor 16. Referring to FIG. 1, the magnetic sensor 16 and the counter roller 12 are arranged inside the right transport roller 13 (in the direction perpendicular to the paper surface of FIG. 1 and the back side of the transport roller 13). Thus, since the magnetic sensor 16 and the opposing roller 12 can be deleted from FIG. 1 and the place becomes an empty space, other parts such as an optical sensor for discriminating bills can be mounted there.
In the example of FIG. 3, the pair of transport rollers 13 ′ and the opposing roller 12 are disposed on the back side of the banknote 1 and cannot be seen. In addition, the optical sensor is not directly related to the purpose of this embodiment, and the illustration thereof is omitted.

Next, the reason and principle of detecting the magnetic permeability and residual magnetization by the magnetic sensors 15 and 16 will be described with reference to FIGS.
FIG. 4 is an example of a BH hysteresis curve of a magnetic material. The horizontal axis in FIG. 4 indicates the strength of the magnetic field applied to the magnetic material from the outside, and the vertical axis indicates the magnetic flux density of the magnetic material. The magnetic flux density when the external magnetic field Hex is not applied is defined as Br. Further, the magnetic flux density when the external magnetic field Hex is applied is assumed to be B1.

The hysteresis curve has a different shape depending on the material and composition of the magnetic material, such as the magnetic material shown in FIG. 5 and the magnetic material shown in FIG. As a method for discriminating between the magnetic bodies of FIG. 5 and FIG.
Br in FIG. 5 <Br in FIG.
When the same Hex is applied, B1 in FIG. 5> B1 in FIG.
B1-Br in FIG. 5> B1-Br in FIG.
There is. If the configuration is such that a plurality of Hexes can be set, a plurality of points B1 can be obtained, and more detailed characteristics of the hysteresis curve can be obtained.

In this embodiment, in order to make the above determination, two types of magnetic sensors are used, the magnetic sensor 16 detects Br and the magnetic sensor 15 detects B1.
Waveforms of detection signals from the magnetic sensor of the banknote 1 printed by the magnetic body 106 are shown in FIGS. The horizontal axis of (a) to (d) indicates the printing position of the magnetic material, and the vertical axis indicates the output voltage of the magnetic sensor.
(A) is the value of B1 which detected with the magnetic sensor 16 the banknote which printed the magnetic body shown in FIG. (B) is a value of Br obtained by detecting the banknote printed with the magnetic material shown in FIG. (C) is the value of B1 which detected the banknote which printed the magnetic body shown in FIG. (D) is a value of Br obtained by detecting the banknote printed with the magnetic material shown in FIG.

  From the detection results of the magnetic sensors 15 and 16, it is determined that (a) and (c) are printed with a magnetic material so as to have similar waveforms. However, since the value of (b) is large because the value of Br in FIG. 5 is small, and the value of (d) is large because the value of Br is large in FIG. 6, the magnetic material used for the printing of banknotes may be different. There is.

  If the bill discriminating apparatus is equipped with only the magnetic sensor 16 for reading Br, it is difficult to clearly determine the material of the magnetic material because the waveforms of (a) and (c) are similar. However, if the detection signal of the magnetic sensor 15 is used, the magnetic bodies of FIGS. 5 and 6 can be distinguished from the difference between (b) and (d).

  When the printing density of the magnetic material is adjusted so that (b) and (d) have similar waveforms, the waveforms of (a) and (c) are different and the magnetic materials of FIGS. 5 and 6 are distinguished. it can.

Next, from another point of view, a method for discriminating between magnetic materials based on detection signals from the magnetic sensors 15 and 16 will be described with reference to FIG.
FIG. 11 shows the relationship between the detection output signal of the bill magnetic sensor and the determination pattern. The banknotes 1 on which the portions S4, S5, and S6 are printed with the magnetic ink containing the magnetic body 106 having the magnetic characteristics shown in FIGS. 4, 5, and 6 are used as the magnetic sensor 15 (for B1 detection) and the magnetic sensor. 16 (for Br detection). The detection signals of the magnetic sensors 15 and 16 have waveforms as shown in (a-1) and (b-1).

  With respect to the detection pattern, B1 has substantially the same height in FIGS. 4, 5, and 6 as shown in (b-1), so that the output waveform of the magnetic sensor 15 is almost the same height and all “1”. It becomes a pattern. On the other hand, as shown in (b-2), Br has different sizes in FIGS. 4, 5, and 6, and thus the magnitude of the output waveform of the magnetic sensor 16 is different. That is, in FIG. 4, almost half of B1 has a pattern of “0”, in FIG. 5, most of the pattern has “0”, and in FIG. 6, the output is almost the same as B1. Therefore, the pattern is a pattern including a portion that becomes “0.5” and a portion that becomes “0” as shown in (b-2).

Therefore, by comparing the detection patterns of the magnetic sensor 15 and the magnetic sensor 16, it can be determined which of the magnetic inks in FIGS. 4, 5, and 6 is used. Therefore, for example, the following four criteria can be set to discriminate the magnetic ink of the banknote.
(1) When the pattern of detection output of the magnetic sensor 15 is “0”, there is no magnetic ink.
(2) When the pattern of the detection output of the magnetic sensor 15 is “1” and the pattern of the magnetic sensor 16 and the magnetic sensor 15 is “0”, the magnetic ink of FIG. 5 is included.
(3) When the pattern of the detection output of the magnetic sensor 15 is “1” and the pattern of the magnetic sensor 16 and the magnetic sensor 15 is “0.5”, the magnetic ink of FIG. 4 is included.
(4) When the pattern of the detection output of the magnetic sensor 15 is “1” and the pattern of the magnetic sensor 16 and the magnetic sensor 15 is “1”, the magnetic ink of FIG. 6 is included.

  Therefore, for example, it is assumed that the magnetic ink 106 used in the 10,000 yen bill has the magnetic characteristics shown in FIG. Since the magnetic permeability and remanent magnetization patterns at specific locations on the 10,000 yen bill are known in advance, for example, the pattern according to (4) above is stored in advance in the storage unit 183 as the known pattern. Then, the processing unit 184 compares the detection pattern of the magnetic sensors 15 and 16 obtained from the 10,000-yen bill actually targeted for discrimination with the pattern stored in the storage unit 183 in advance, so that the magnetic ink It can be determined whether or not.

  Thus, in the banknote discriminating apparatus of the present embodiment, the magnetic sensor 15 or 16 detects the magnetic permeability and residual magnetization of the banknote, so that either the printing density of the magnetic body of the banknote or the material of the magnetic body can be used. If it does not match the normal banknote, it is judged as a fake ticket. In order to be judged as a genuine note, it is necessary that both the printing density of the magnetic material and the material of the magnetic material are normal. For this reason, the authenticity determination capability of a banknote can be improved further and forgery of a banknote becomes more difficult.

Next, an example of a banknote handling apparatus to which the banknote discriminating apparatus is applied will be described with reference to FIG. Although FIG. 8 schematically shows, this banknote handling apparatus may be, for example, ATM or a single banknote discrimination apparatus.
The banknote discriminating apparatus 100 as shown in FIG. 1 is connected to a transport path switching mechanism 82 via a transport path 81. The switching mechanism 82 switches and controls the transport paths 811, 812, and 813 according to the determination result 19 from the bill discriminating apparatus 100. Thereby, the banknote 1 is guided and stored in any of the storage boxes 86, 87 and 88. The determination result 84 is sent to the display unit 85 and displayed. The display unit 85 is, for example, an ATM operation screen. In the case of a single device, the display unit 85 is a display that displays a discrimination result.

  As an example of banknote 1 switching control according to the banknote determination result 19, for example, a banknote determined to be normal is stored in the storage 86, and the storage 87 is determined to be abnormal by both the magnetic sensors 15 and 16. The stored banknotes are stored, and the storage 88 is controlled so as to store banknotes determined to be normal by one of the magnetic sensor 16 and the magnetic sensor 15 and determined to be abnormal by the other sensor.

  By controlling the switching in this way, banknotes determined to be normal are stored in the storage 86, and banknotes that are not handled, that is, banknotes that are clearly determined to be abnormal, are stored in the storage 87. In 88, it can classify | categorize according to the determination result of a banknote so that a banknote suspected of forgery may be accommodated. In the case of ATM, it may be controlled to omit storing in the storage 87 and to return the banknote clearly determined to be abnormal to the deposit port.

  In practice, the banknote is often discriminated by using not only a magnetic sensor but also a detection signal from an optical sensor to determine the denomination and authenticity of the banknote. However, even in that case, as described above, it is understood that the banknotes can be classified by using the determination result based on the magnetic characteristics detected by a plurality of types of magnetic sensors as one factor.

Next, another actual example will be described with reference to FIGS. 9 and 10.
FIG. 9 shows how securities are detected by the magnetic sensor, and FIG. 10 shows detection output signals of the magnetic sensor.
The figure shows a securities 900 as an example of a paper sheet. This has a part (code part) 901 where the magnetic material is printed as discrete codes and a part (pattern part) 902 where it is printed as a continuous pattern. The securities 900 are conveyed in the direction of the arrow X, and the magnetic characteristics are detected by the magnetic sensors 95 and 96.

  The code part 901 is mainly used to determine the type of securities, and information on securities is included in the arrangement of codes, and information is not included in the shading of printing. The pattern portion 902 is a pattern, pattern, or the like printed by a magnetic material, and information is included in the density of printing. The encoding unit 901 can also be used for security thread detection.

  The magnetic sensor 95 is a sensor for reading the sign portion 901 and has a wide detection area so as to detect the sign portion 901 without fail. The magnetic sensor 96 is a sensor for reading the pattern portion 902, and, for example, a plurality of small magnetic heads are arranged so as to output in detail the shade of printing of the pattern portion 902. That is, the magnetic sensor 96 has a dead zone.

  When the securities 900 are scanned by the magnetic sensor 95, an output signal as shown in FIG. 10A is obtained, and when scanned by the magnetic sensor 96, an output signal as shown in FIG. 10B is obtained. Here, the horizontal axis of FIGS. 10A and 10B indicates the scanning direction, and the vertical axis indicates the sensor output voltage.

  As shown in FIG. 10A, the magnetic sensor 95 can detect the unevenness of the output of the sign portion 901, but the unevenness of the output of the pattern portion 902 is small. This is because the detection area of the magnetic sensor 95 is wide and the fine shading of the pattern portion 902 is averaged. On the other hand, as shown in (b), since the magnetic sensor 96 is spaced apart, when the securities 900 are conveyed obliquely with respect to the direction X, a part of the output signal of the encoding unit 901 is missing. End up.

  As described above, when both the magnetic sensor 95 that covers the entire securities 900 without gaps and does not overlook the sign portion 901 and the sensor 205 that outputs detailed pattern shading, both the sign portion and the pattern portion are detailed. Can be read.

  In this embodiment, for example, the magnetic sensor 16 for detecting residual magnetism shown in FIG. 1 can be used as the magnetic sensor 95, and the magnetic sensor 15 for detecting magnetic permeability can be used as the magnetic sensor 96. Conversely, the magnetic sensors 15 and 16 of FIG. 1 may be used as the magnetic sensors 95 and 96. Which one is to be applied may be determined based on the position of the sign portion or pattern portion of the magnetic material of the paper sheet to be detected and the matching arrangement.

As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, A various deformation | transformation can be implemented within the range of the meaning.
For example, FIG. 1 and FIG. 3 have been described on the assumption that the banknote is transported in the width direction. However, in an apparatus for transporting banknotes in the length direction, the arrangement relationship of rollers and the like in the transport system is mainly changed. The basic purpose of this embodiment is to use a detection signal from a kind of magnetic sensor.

  Further, when there is a margin in the mounting of the conveyance path of the bill discriminating apparatus, the arrangement of the relationship between the magnetic sensor 16 and the conveyance roller 13 'as shown in FIG. 3 is applied to the arrangement of the magnetic sensor 16 shown in FIG. May be. In other words, the mounting of the transport roller 13 ′ shown in FIG. Thus, by arrange | positioning conveyance roller 13 ', conveyance of a banknote is stabilized and jamming of a banknote can be reduced further.

  Further, the object to which this determination method is applied is not limited to the banknotes and securities of the above-described embodiments, but can be widely applied to the detection of the magnetic properties of paper sheets including a magnetic material.

The figure which shows the structure of the banknote discrimination | determination apparatus by one Example. The functional block diagram of the banknote discrimination | determination apparatus in one Example. The top view which shows the arrangement | positioning relationship between the magnetic sensor and the conveyance roller in the banknote discrimination device by one Example. The figure which shows an example of the BH hysteresis curve of a magnetic body. The figure which shows an example of the BH hysteresis curve of a magnetic body. The figure which shows an example of the BH hysteresis curve of a magnetic body. The figure which shows the detection output signal by the magnetic sensor of a banknote. The figure which shows the example of the banknote handling apparatus to which a banknote discrimination device is applied. The figure which shows the relationship of the detection of securities by a magnetic sensor. The figure which shows the output signal which detected securities by the magnetic sensor. The figure which shows the relationship between the detection output signal of a magnetic sensor of a banknote, and a determination pattern.

Explanation of symbols

1: bill, 10: transport path, 12: counter roller, 13: transport roller,
15, 16: Magnetic sensor, 106: Magnetic body, 18: Control device 100: Bill discriminating device, 81: Transport path, 82: Transport path switching mechanism 85: Display unit, 86 to 88: Storage,
900: Securities, 901: Sign part, 902: Pattern part

Claims (6)

Covers the entire paper to be conveyed, positioned so as to obtain a first line type magnetic sensor for detecting the magnetic permeability of the magnetic material contained in the paper, partially detection signal from the paper leaves to be conveyed A second line type magnetic sensor for detecting the remanent magnetization of the magnetic substance contained in the paper sheet, and a direction perpendicular to the transport direction of the paper sheet, beside the second line type magnetic sensor. A paper roller for transporting the paper sheet, and the signal detected by the first line type magnetic sensor and the second line type magnetic sensor is used for discrimination of the paper sheet. Classification device. Detected by the first or second line-type magnetic sensor, which stores in advance information related to the remanent magnetization of the magnetic material used in the paper sheet, and determination information related to the magnetic permeability used in the paper sheet. A processing unit that collates signal information with the determination information stored in the storage unit, and determines the sheet according to a result of the collation in the processing unit. 1 paper sheet discrimination device. 3. The paper sheet discriminating apparatus according to claim 2, wherein the denomination and authenticity of the bill are determined by collation in the processing unit. 4. The paper sheet discriminating apparatus according to claim 1, wherein at least one of the first or second line type magnetic sensor is an array of magnetic sensors having a dead zone. 5. The paper sheet discriminating apparatus according to claim 1, wherein the first line type magnetic sensor has an exciting unit that excites a magnetic material contained in the paper sheet. A plurality of storage units for sorting and storing the paper sheets processed by the processing unit, and switching a transport path to transport the paper sheets to one of the plurality of storage units according to the processing result of the processing unit 6. The paper sheet discriminating apparatus according to claim 1, further comprising a switching mechanism.

Images