JP2021168033A - Paper sheet identification apparatus, paper sheet processing apparatus and paper sheet identification method - Google Patents

Abstract

To provide a paper sheet identification apparatus, a paper sheet processing apparatus and a paper sheet identification method capable of detecting anisotropic media provided on paper sheets.SOLUTION: A paper sheet identification apparatus identifies a paper sheet comprising a security element including a magnetic body, and comprises: a magnetic field application part which applies a first magnetic field perpendicular to a surface of a paper sheet and a second magnetic field parallel therewith; a magnetic detection part which detects first magnetic characteristic of a magnetic body of the paper sheet applied with the first magnetic field and a second magnetic characteristics of the magnetic body of the paper sheet applied with the second magnetic field; and a control part which performs identification processing on the paper sheet based upon the first magnetic characteristics and second magnetic characteristics detected by the magnetic detection part.SELECTED DRAWING: Figure 4

Description

The present invention relates to a paper leaf identification device, a paper leaf processing device, and a paper leaf identification method.

Conventionally, various security features may be added to prevent counterfeiting of paper sheets. For example, banknotes in many countries are provided with a security thread as a security element. The security thread is generally a thin strip made of metal or resin, and is provided by being attached to or squeezed into a base material. Some security threads are called magnetic threads, and magnetic information is added to the threads of the magnetic threads.

For example, Patent Document 1 discloses a method of magnetizing a magnetic pattern by generating a magnetic field parallel to the surface of a magnetic head.

Further, in Patent Document 2, a magnetic field perpendicular to the transport direction of paper sheets and parallel to the transport surface of paper sheets causes the magnetic field strength to decrease as the transport direction progresses and reach zero, and then the magnetic field becomes zero. A magnetic material detection device for generating a magnetic field in which the direction is reversed and the magnetic field strength increases again is disclosed.

Patent No. 6209674 Patent No. 59455627

However, in recent years, an anisotropic medium having a fixed magnetizing direction, that is, strongly magnetizing (magnetizing) only in a specific direction, and an anisotropic medium having an undetermined magnetizing direction, that is, magnetizing (magnetizing) in all directions. The isotropic medium may be mixed and used in the length direction of the magnetic thread. As described above, the anisotropic medium has a feature that it must be magnetized with respect to the surface of the paper sheet in a predetermined direction which is the magnetizing direction of the anisotropic medium. Therefore, when the magnetic thread includes an anisotropic medium that magnetizes in a direction perpendicular to the surface of the paper leaf, the magnetizing direction of the magnetic field application unit mounted on the paper leaf identification device is the surface of the paper leaf. If it is parallel to the above, there is a problem that the magnetic output of the magnetic detection unit mounted on the paper leaf identification device is not stable.

Further, Patent Documents 1 and 2 both disclose a technique of magnetizing in a direction parallel to the surface of the paper leaves, and as described above, the magnetization direction of the anisotropic medium is the paper leaves. When the direction is perpendicular to the plane of, it is difficult to stably detect the anisotropic medium.

The present invention has been made in view of the above situation, and provides a paper leaf identification device, a paper leaf processing device, and a paper leaf identification method capable of detecting an anisotropic medium provided on paper sheets. The purpose is to do that.

In order to solve the above-mentioned problems and achieve the object, the present invention is a paper leaf identification device for identifying paper leaves having a security element containing a magnetic substance, and is perpendicular to the surface of the paper leaves. A magnetic field application unit that applies a first magnetic field and a parallel second magnetic field, the first magnetic properties of the magnetic material of the paper leaf to which the first magnetic field is applied, and the paper to which the second magnetic field is applied. The magnetic detection unit that detects the second magnetic property of the magnetic material of the leaf, and the paper leaf identification process based on the first magnetic property and the second magnetic property detected by the magnetic detection unit. It is characterized by including a control unit for performing the operation.

Further, the present invention is characterized in that, in the above invention, the magnetic field application unit includes a first magnet to which the first magnetic field is applied and a second magnet to which the second magnetic field is applied.

Further, the present invention is characterized in that, in the above invention, the magnetic detection unit includes a first magnetic sensor that detects the first magnetic characteristic and a second magnetic sensor that detects the second magnetic characteristic. ..

Further, the present invention is characterized in that, in the above invention, the control unit performs authenticity determination processing of the paper sheets based on the first magnetic characteristic and the second magnetic characteristic.

Further, in the present invention, when the output waveform of the magnetic detection unit is different between the time of detection of the first magnetic characteristic and the time of detection of the second magnetic characteristic, the control unit has the same magnetism. When it is determined that the body is an anisotropic medium and the output waveform of the magnetic detection unit is similar between the time of detecting the first magnetic characteristic and the time of detecting the second magnetic characteristic, the magnetic material is equal. It is characterized in that it is determined to be an anisotropic medium.

Further, the present invention is characterized in that, in the above invention, the control unit performs a denomination determination process for the paper sheets based on the first magnetic property and the second magnetic property.

Further, the present invention is characterized in that, in the above invention, the security element is a magnetic thread.

Further, the present invention is a paper leaf processing device, wherein the paper leaf processing device includes the paper leaf identification device.

Further, the present invention is a method for identifying paper sheets having a security element containing a magnetic substance, the step of applying a first magnetic field perpendicular to the surface of the paper leaves, and the first step. A step of detecting the first magnetic property of the magnetic material of the paper leaf to which one magnetic field is applied, a step of applying a second magnetic field parallel to the surface of the paper leaf, and a step of applying the second magnetic field. A step of detecting the second magnetic property of the magnetic material of the paper leaf, and an identification process of the paper leaf based on the first magnetic property and the second magnetic property detected by the magnetic detection unit. It is characterized by having a step of performing the above.

According to the paper leaf identification device, the paper leaf processing device, and the paper leaf identification method of the present invention, it is possible to detect the anisotropic medium provided on the paper leaves.

It is a schematic diagram for demonstrating an anisotropic medium and an isotropic medium. (A) is a perspective view showing the appearance of the banknote processing apparatus according to the first embodiment, and (b) is a cross-sectional view showing the internal structure of the banknote processing apparatus according to the first embodiment. It is a schematic diagram explaining the structure of the banknote acceptor according to Embodiment 1, (a) is a sectional view, and (b) is a plan view. It is sectional drawing which explains the structure of the magnetic line sensor which concerns on Embodiment 1. FIG. It is a plane schematic diagram explaining the structure of the magnetic line sensor which concerns on Embodiment 1. FIG. It is a block diagram explaining the structure of the banknote identification device which concerns on Embodiment 1. FIG. It is a schematic diagram which shows an example of the output waveform of the magnetic detection part (the 1st magnetic sensor and the 2nd magnetic sensor) which concerns on Embodiment 1. It is a flowchart which shows an example of the procedure of the process performed by the banknote acceptor according to Embodiment 1. It is sectional drawing which explains the structure of an example of the magnetic line sensor which concerns on a deformed form. It is sectional drawing which explains the structure of another example of the magnetic line sensor which concerns on a deformed form.

Hereinafter, preferred embodiments of the paper leaf identification device, the paper leaf processing device, and the paper leaf identification method according to the present invention will be described with reference to the drawings. As the paper leaves to be the subject of the present invention, various paper leaves such as banknotes, checks, gift certificates, bills, forms, securities, card-like media, etc. can be applied. The present invention will be described by exemplifying the apparatus and method described above. The following description is an example of a paper leaf identification device, a paper leaf processing device, and a paper leaf identification method.

<Outline of this embodiment>
First, the outline of the banknote identification method in the first embodiment will be described. The present embodiment provides a method of detecting an anisotropic medium and an isotropic medium from a banknote provided with a magnetic thread as a security element containing a magnetic material, and identifying the banknote based on the detection result. The target security element (magnetic thread) may include an anisotropic medium and an isotropic medium as a magnetic material, may include only an anisotropic medium, or may include only an isotropic medium. Although it may be a magnetic material, it is preferable that the magnetic material contains an anisotropic medium and an isotropic medium, and that the magnetic material contains only an anisotropic medium, and in particular, the magnetic material includes an anisotropic medium and an isotropic medium. Those containing a sex medium are preferable.

First, an anisotropic medium and an isotropic medium will be described. The anisotropic medium is a magnetic material (for example, an anisotropic magnet) having a characteristic of being strongly magnetized (magnetized) only in a specific direction, and the direction is called an easy magnetization direction. On the other hand, an isotropic medium is a magnetic material having the characteristic of being magnetized in all directions. Both the anisotropic medium and the isotropic medium contained in the magnetic thread of the banknote generally have a high coercive force.

More specifically, as shown in FIG. 1, both the anisotropic medium and the isotropic medium are aggregates of a large number of particles, and each particle has an easy axis of magnetization in the same direction (the crystal is magnetized). It is composed of innumerable atomic magnets with easy directions and black arrows in the figure). In the anisotropic medium, the easy-to-magnetize axes of the particles are aligned in one direction, and this direction is the magnetizing direction (easy magnetization direction). On the other hand, in an isotropic medium, the easy axes of magnetization of each particle are different from each other, so that the particles are magnetized in all directions.

Then, in the anisotropic medium contained in the magnetic thread of the banknote, the direction in which the magnetization is easily magnetized is usually in a direction perpendicular to or horizontal to the surface of the banknote. Therefore, in the present embodiment, a first magnetic field perpendicular to the surface of the bill (hereinafter referred to as a vertical magnetic field) and a second magnetic field parallel to the surface of the bill (hereinafter referred to as a horizontal magnetic field) are referred to as a bill. Apply to. As a result, the anisotropic medium contained in the magnetic thread can be magnetized by a vertical magnetic field or a horizontal magnetic field, and the anisotropic medium can be stably detected by the magnetic sensor. On the other hand, since the isotropic medium contained in the magnetic thread can be magnetized by either a vertical magnetic field or a horizontal magnetic field, this can also be stably detected by the magnetic sensor.

Hereinafter, among the anisotropic media contained in the magnetic thread of the bill, the anisotropic media in which the easy magnetization direction is oriented in the direction perpendicular to and parallel to the surface of the bill are referred to as a vertically anisotropic medium and a horizontally different medium, respectively. Also called an anisotropic medium.

<Structure of banknote processing device>
Next, the configuration of the banknote processing apparatus according to the present embodiment will be described with reference to FIG. The banknote processing device 200 according to the present embodiment has, for example, the configurations shown in FIGS. 1 (a) and 1 (b). The banknote processing device 200 shown in FIGS. 1A and 1B has a hopper 210 capable of placing a plurality of banknotes, a payout unit 211 for feeding out the banknotes placed on the hopper 210 one by one, and a payout unit 211. A transport path 212 for transporting banknotes delivered from the banknotes, a banknote identification device 100 for performing banknote identification processing, a collection unit 213 for accumulating normal banknotes identified by the banknote identification device 100, and an abnormality that does not satisfy a predetermined condition. A reject unit 214 for accumulating various banknotes, a display unit 215 for displaying information input to the banknote processing device 200, a processing result, etc., and a transport unit for transporting bills one by one along a transport path 212 ( (Not shown) and. The transport unit includes a plurality of transport means such as rollers and a drive device such as a motor that drives the transport means. The banknote processing device 200 further includes a transmission type or reflection type optical sensor at each position indicated by a triangular mark in the drawing in order to detect the state of transporting banknotes in the device. From the detection results of these optical sensors, the shape and skew state of the bill may be estimated. By using the banknote identification device 100 built into such a banknote processing device 200, a plurality of banknotes placed on the hopper 210 can be continuously processed into a fake ticket, a loss ticket, or an uncertain authenticity ticket. The determined banknotes can be returned to the reject unit 214 and sorted.

<Structure of banknote identification device>
Next, the configuration of the bill identification device 100 will be described with reference to FIG. As shown in FIGS. 3A and 3B, the bill identification device 100 according to the present embodiment has an upper unit and a lower unit sandwiching a transport path 212 for transporting bills BN in the bill processing device 200. It is composed of and. FIG. 3B corresponds to a plan view of the upper unit of the bill identification device 100 as viewed from below. The bill identification device 100 detects the bill BN sequentially transported to the bill identification device 100 along the transport path 212 of the bill BN, and determines the timing of starting the detection of the bill BN in the bill identification device 100. An image of a bill BN that is composed of a photo sensor 11 that generates a detection signal, an image sensor in which imaging elements such as CCD and CMOS are arranged in a line, and an imaging optical system such as a light source and a lens, and is conveyed along a transport path 212. Thickness detection that detects the thickness of the bill BN by detecting the amount of displacement of the optical line sensor (close contact image sensor) 20 that detects the data and the roller that faces each other across the transport path 212 when passing the bill BN. A configuration in which a sensor 30, a magnetic line sensor 40 for detecting magnetic information and a magnetic pattern contained in a bill BN carried on a transport path 212, and a photo sensor 12 for detecting the passage of a bill BN are arranged side by side. Has. The optical line sensor 20, the thickness detection sensor 30, and the magnetic line sensor 40 are sufficiently long with respect to the width of the transport path 212 and can detect the entire surface of the banknote BN. Further, the bill identification device 100 is provided with a transport mechanism 13 so that the bill BN can move in the transport path 212. The transport mechanism 13 is not particularly limited, and for example, a mechanism in which a roller, a belt, or the like is driven by a drive device such as a motor is used. Further, below the magnetic line sensor 40, a hair roller 14 provided with a hair-like material on the outer peripheral surface is arranged so that the bill BN can be brought into close contact with the magnetic detection surface of the magnetic line sensor 40. ..

The bill identification device 100 uses the data (information) acquired by these sensors to perform the bill BN identification process. The content of the identification process is not particularly limited. For example, in the case of a banknote, identification of the denomination, determination of authenticity or correctness of the banknote, acquisition of external shape information and passing position information of the banknote, numbers and characters printed on the banknote. Various functions such as reading symbols such as, etc. can be mentioned.

The bill BN is provided with a magnetic thread MT as a security element containing a magnetic material. The magnetic thread MT is a thin strip made of metal or resin to which magnetic information is given, and is provided by being attached to or squeezed into the base material of a banknote BN. The magnetic thread MT is provided, for example, from one end to the other end of the bill BN in the lateral direction.

<Structure of magnetic line sensor>
Next, the configuration of the magnetic line sensor 40 will be described with reference to FIG. Note that FIG. 4 shows the magnetic line sensor 40 shown in FIG. 3A turned upside down. As shown in FIG. 4, the magnetic line sensor 40 includes a magnetic field application unit 41 including a first magnet 41a and a second magnet 41b, and a magnetic detection unit including a plurality of first magnetic sensors 42a and a plurality of second magnetic sensors 42b. It has 42 and. The first magnet 41a, the first magnetic sensor 42a, the second magnet 41b, and the second magnetic sensor 42b are arranged in the vicinity of the transport path 212, and are arranged in this order in the transport direction of the bill BN transported through the transport path 212. ing.

The first magnet 41a and the second magnet 41b are arranged so as to extend in the main scanning direction (direction orthogonal to the transport direction of the bill BN), and are shown in FIG. 4 around the magnets 41a and 41b. Such a loop-shaped magnetic flux is formed, and particularly in the vicinity of the transport surface 216, a magnetic field perpendicular to the transport surface 216 is formed by the first magnet 41a, and parallel to the transport surface 216 by the second magnet 41b. Magnetic field is formed. Therefore, the first magnet 41a and the second magnet 41b apply a vertical magnetic field and a horizontal magnetic field to the banknote BN transported through the transport path 212, respectively. The banknote BN that has passed through the vertical magnetic field is magnetized in the direction perpendicular to the surface of the banknote BN, and the banknote BN that has passed through the horizontal magnetic field is magnetized in the direction parallel to the surface of the banknote BN. That is, the vertically anisotropic medium is magnetized by the vertical magnetic field generated by the first magnet 41a, but is not magnetized by the horizontal magnetic field generated by the second magnet 41b. The horizontally anisotropic medium is not magnetized by the vertical magnetic field generated by the first magnet 41a, but is magnetized by the horizontal magnetic field generated by the second magnet 41b. The isotropic medium is magnetized by either a vertical magnetic field generated by the first magnet 41a or a horizontal magnetic field generated by the second magnet 41b.

The north and south poles of the first magnet 41a are arranged side by side in the direction orthogonal to the carrying surface 216 on which the bill BN is carried, and the north and south poles of the second magnet 41b are the carrying directions of the bill BN. They are arranged side by side in the direction parallel to.

The first magnet 41a and the second magnet 41b are permanent magnets or electromagnets, and generate a DC magnetic field. One of the first magnet 41a and the second magnet 41b may be a permanent magnet and the other may be an electromagnet.

The first magnetic sensor 42a is arranged at a constant pitch in the main scanning direction, and the second magnetic sensor 42b is located at the same position as the first magnetic sensor 42a in the main scanning direction and by the same number as the first magnetic sensor 42a. Have been placed. That is, the second magnetic sensor 42b is arranged at the same pitch as the first magnetic sensor 42a in the main scanning direction. Further, each of the magnetic sensors 42a and 42b outputs a detection signal independently of each other. As a result, the magnetic line sensor 40 can divide the bill BN into regions corresponding to the respective magnetic sensors 42a and 42b, and measure the magnetic characteristics of the bill BN in each region.

Hereinafter, the pair of the first magnetic sensor 42a and the second magnetic sensor 42b existing at the same position in the main scanning direction are treated as magnetic sensors of the same channel.

Of the plurality of first magnetic sensors 42a, the first magnetic sensor 42a through which the magnetic thread MT passes in the vicinity has the first magnetic characteristics of the magnetic material of the magnetic thread MT of the bill BN to which a vertical magnetic field is applied by the first magnet 41a. Is detected. Here, when the magnetic thread MT contains a vertically anisotropic medium, the vertically anisotropic medium is magnetized by the first magnet 41a, so that the first magnetic sensor 42a through which the magnetic thread MT passes in the vicinity is The magnetic characteristics of the vertically anisotropic medium can be stably detected as the first magnetic characteristics. On the other hand, when the magnetic thread MT contains a horizontally anisotropic medium, the horizontally anisotropic medium is not magnetized by the first magnet 41a, so that the first magnetic sensor 42a through which the magnetic thread MT passes in the vicinity is horizontally different. The magnetic properties of the anisotropic medium cannot be detected stably.

Of the plurality of second magnetic sensors 42b, the second magnetic sensor 42b through which the magnetic thread MT passes in the vicinity (usually, the second magnetic sensor 42b on the same channel as the first magnetic sensor 42a that has detected the first magnetic characteristic) is , The second magnetic property of the magnetic material of the magnetic thread MT of the bill BN to which the horizontal magnetic field is applied by the second magnet 41b is detected. Here, when the magnetic thread MT contains a horizontally anisotropic medium, the horizontally anisotropic medium is magnetized by the second magnet 41b, so that the second magnetic sensor 42b through which the magnetic thread MT passes in the vicinity is The magnetic characteristics of the horizontally anisotropic medium can be stably detected. On the other hand, when the magnetic thread MT contains a vertically anisotropic medium, the vertically anisotropic medium is not magnetized by the second magnet 41b, so that the second magnetic sensor 42b through which the magnetic thread MT passes in the vicinity is vertically different. The magnetic properties of the anisotropic medium cannot be detected stably.

As described above, in the present embodiment, regardless of whether the anisotropic medium of the magnetic thread MT is the vertically anisotropic medium or the horizontally anisotropic medium, at least one first magnetic sensor 42a and at least one Stable detection can be performed by either one of the second magnetic sensor 42b.

When the magnetic thread MT includes an isotropic medium, the isotropic medium is magnetized by both a vertical magnetic field and a horizontal magnetic field, so that at least one first magnetic sensor 42a and at least one first magnetic sensor 42a are used. 2 Stable detection can be performed by any of the magnetic sensor 42b.

That is, the output waveforms (output signals) of the first magnetic sensor 42a and the second magnetic sensor 42b (usually the first magnetic sensor 42a and the second magnetic sensor 42b of the same channel) through which the magnetic thread MT passes in the vicinity are magnetic. When the thread MT contains a vertically anisotropic medium or a horizontally anisotropic medium, the shapes are different from each other, but when the magnetic thread MT contains an isotropic medium, the shapes are similar to each other. Therefore, in the present embodiment, the anisotropic medium and the isotropic medium can be detected separately. Therefore, for the bill BN having a security element including an anisotropic medium and an isotropic medium, the first magnetic characteristic and the second magnetic characteristic are based on the detection results of the first magnetic sensor 42a and the second magnetic sensor 42b. Based on this, the authenticity can be determined accurately.

The magnetic sensors 42a and 42b may or may not have a sensing axis. The sensing axis may be set so as to radiate from the magnetic sensors 42a and 42b in a plane parallel to the transport direction of the bill BN and perpendicular to the transport surface 216 of the bill BN, or transport the bill BN. It may be set in a direction perpendicular to the surface 216.

Each magnetic sensor 42a, 42b includes one or more magnetic detection elements (not shown). As the magnetic detection element, an element (differential magnetic detection element) that outputs a change in the magnetic flux density of the magnetic material of the magnetic thread MT to be detected as a signal is preferably used. Specific examples thereof include a magnetoresistive element (MR element), a fluxgate (FG element), and a magnetic impedance (MI element). The type of magnetoresistive element (MR element) may be an anisotropic magnetoresistive element (AMR element), a giant magnetoresistive element (GMR element), a tunnel magnetoresistive element (TMR element), or the like. Further, the magnetic detection element may output the strength (absolute value) of the magnetic flux density of the object to be detected, and for example, a Hall element or the like may be used.

For example, each of the magnetic sensors 42a and 42b has two AMR elements arranged in a direction parallel to the transport direction of the bill BN, a wiring pattern connected to the two AMR elements, and a plurality of externals connected to the wiring pattern. It includes a connection terminal and a circuit board in which the connection terminal is connected to each external connection terminal.

<Functional block of banknote acceptors>
Next, the functional block of the bill identification device 100 will be described with reference to FIG. As shown in FIG. 4, the bill identification device 100 further includes a control unit (calculation processing unit) 50 that controls each component of the bill identification device 100, and a storage unit 60. Each sensor, storage unit 60, and the like are connected to the control unit 50.

The storage unit 60 is composed of a storage device such as a volatile or non-volatile memory, and stores various programs and various data for controlling the bill identification device 100. Further, the storage unit 60 stores a template as reference information used for the identification process for each of the various identification processes.

The control unit 50 is composed of, for example, a software program for realizing various processes, a CPU for executing the software program, various hardware controlled by the CPU, and the like. Software programs and data necessary for the operation of the control unit 50 are stored in the storage unit 60.

In the present embodiment, the control unit 50 is based on the first magnetic characteristic and the second magnetic characteristic detected by the magnetic detection unit 42, that is, the first magnetic characteristic and the second magnetic sensor detected by the first magnetic sensor 42a. The identification process of the bill BN is performed based on the second magnetic characteristic detected by 42b. Hereinafter, the banknote BN identification process by the control unit 50 will be further described.

The control unit 50 compares the feature pattern of the image of the banknote BN collected by the optical line sensor 20 with the template for determining the denomination, which is the feature pattern for each denomination of the banknote BN, and compares the denomination of the banknote BN. To judge.

The control unit 50 may determine the denomination of the bill BN based on the first magnetic characteristic and the second magnetic characteristic. This is because the magnetic information contained in the magnetic thread MT of the bill BN usually includes a denomination code which is a code indicating the denomination of the bill. More specifically, the magnetic thread MT of the banknote BN usually comprises alternating high and high coercive forces in which the magnetic material is present and non-magnetic parts in which the magnetic material is absent, depending on the arrangement and length of each of these parts. Represents a seed code. In the present embodiment, even if at least one high-high magnetic force-holding portion is an anisotropic medium, the high-high-holding voltage is maintained by either at least one first magnetic sensor 42a and at least one second magnetic sensor 42b. The magnetic force portion can be detected. That is, even if the magnetic thread MT contains an anisotropic medium, its denomination code can be read.

When determining the denomination of the bill BN based on the first magnetic characteristic and the second magnetic characteristic, the control unit 50 determines the result of the denomination determination based on the image of the bill BN, and the first magnetic characteristic and the second magnetism. The final denomination of the banknote BN is determined by comprehensively determining the result of the denomination determination based on the characteristics.

Further, the control unit 50 determines the transport state including the direction, front and back, position, and skew size of the banknote BN based on the image of the banknote BN.

Further, the control unit 50 identifies the region where the magnetic thread MT exists based on the denomination determination result of the bill BN and the transport state. For example, information indicating the presence / absence and position of the magnetic thread MT is included in the template for each denomination, and the magnetic thread MT is based on the information corresponding to the specified denomination and the transport state of the bill BN. Identify the area in which it exists.

Further, the control unit 50 has the first magnetic sensor 42a and the first magnetic sensor 42a through which the magnetic thread MT passes in the vicinity from the plurality of first magnetic sensors 42a and the plurality of second magnetic sensors 42b based on the area of the specified magnetic thread MT. The second magnetic sensor 42b is specified.

Further, the control unit 50 determines the authenticity of the banknote BN by using the data collected by each sensor. Specifically, the control unit 50 performs a plurality of types of authenticity determination processing on the banknote BN, determines that the banknote is a genuine ticket when all the determination results are true, and falsely determines one of the determination results. Sometimes it is determined that the bill is a counterfeit ticket.

Preferably, the control unit 50 has the first magnetic characteristic detected by the first magnetic sensor 42a through which the magnetic thread MT passes in the vicinity and the second magnetic sensor 42b among the plurality of first magnetic sensors 42a. , The second magnetic characteristic detected by the second magnetic sensor 42b (usually, the second magnetic sensor 42b of the same channel as the first magnetic sensor 42a that detected the first magnetic characteristic) through which the magnetic thread MT passes in the vicinity. Based on this, the authenticity determination processing of the bill BN is performed. Thereby, the authenticity determination of the banknote BN including the security element including the anisotropic medium can be accurately determined based on the presence or absence of the security element.

More preferably, in the control unit 50, when the output waveform of the magnetic detection unit 42 is different between the time of detecting the first magnetic characteristic and the time of detecting the second magnetic characteristic, the magnetic material of the bill BN is anisotropic. If it is determined that the material is a medium and the output waveform of the magnetic detection unit 42 is similar between the time when the first magnetic characteristic is detected and the time when the second magnetic characteristic is detected, the magnetic material of the bill BN is an isotropic medium. Judge that there is. As a result, the anisotropic medium and the isotropic medium can be detected separately, so that the authenticity of the banknote BN including the security element including the anisotropic medium and the isotropic medium can be determined with high accuracy.

More specifically, the control unit 50 uses the output waveform at the time of detecting the first magnetic characteristic of the first magnetic sensor 42a through which the magnetic thread MT passes in the vicinity, and the second magnetic sensor 42b (in which the magnetic thread MT passes in the vicinity). Normally, it is compared with the output waveform of the first magnetic sensor 42a that detected the first magnetic characteristic and the second magnetic sensor 42b) of the same channel, and if they are different, the magnetic material of the magnetic thread MT is an anisotropic medium. If both are similar, it is determined that the magnetic material of the bill BN is an isotropic medium.

When the two output waveforms are different, specifically, when the directions of the peaks existing at the corresponding positions between the two output waveforms are different from each other, one of the two output waveforms is located at the corresponding position. There is a case where a peak exists only in the waveform of. On the other hand, as a case where the two output waveforms are similar, a case where peaks having the same direction exist at corresponding positions between the two output waveforms can be specifically mentioned.

Here, an example of the output waveform of the magnetic detection unit 42 when the first magnetic sensor 42a and the second magnetic sensor 42b include a differential magnetic detection element will be described with reference to FIG. 7. Here, as shown in FIG. 7, the magnetic thread MT of the bill BN alternately includes a high high magnetic force coercive part HC in which a magnetic material exists and a non-magnetic part NM in which a magnetic material does not exist, and the high high magnetic force coercive part HC. As a result, it is assumed that a high high coercive force portion VA including a vertically anisotropic medium, a high high coercive force portion HA including a horizontally anisotropic medium, and a high high coercive force portion IM including an isotropic medium are provided. In this case, in the output waveform of the first magnetic sensor 42a that detects the first magnetic characteristic of the magnetic material of the magnetic thread MT magnetized by the vertical magnetic field, the high high coercive force portion VA and IM peak corresponding to the edge portion. However, the peak does not appear corresponding to the edge portion of the high high coercive force portion HA, and when the high high coercive force portion HA is detected, the output value remains low or is around 0. On the other hand, in the output waveform of the second magnetic sensor 42b that detects the second magnetic characteristic of the magnetic material of the magnetic thread MT magnetized by the horizontal magnetic field, the high coercive force portion HA and IM correspond to the edge portion. Although a peak appears, the peak does not appear corresponding to the edge portion of the high high coercive force portion VA, and when the high high coercive force portion VA is detected, the output value remains low or is around 0. Therefore, by comparing the output waveforms of the first magnetic sensor 42a and the second magnetic sensor 42b with each other, not only the presence or absence of the high high coercive force portion HC but also the high high coercive force portion HC is a vertically anisotropic medium and horizontally anisotropic. It is also possible to determine whether it contains a sex medium or an isotropic medium.

Further, in the magnetic thread MT, the arrangement of the high high magnetic force portion HC and the non-magnetic portion NM, the lengths L1, L2, L3 ... Of each high high magnetic force portion HC, and the length l1 of each non-magnetic portion NM, The denomination code of the bill BN is represented by l2, l3, .... That is, for each denomination of the banknote BN, the arrangement of the high high magnetic force portion HC and the non-magnetic portion NM, the lengths of the high high magnetic force portions HC L1, L2, L3 ..., And the length of each non-magnetic portion NM. L1, l2, l3 ... Are set.

<Procedure for banknote identification>
Next, the procedure of the processing performed by the bill identification device 100 will be described with reference to FIG.

As shown in FIG. 8, first, the magnetic field application unit 41 (first magnet 41a) applies a vertical magnetic field to the surface of the bill (step S11).

Next, the magnetic detection unit 42 (first magnetic sensor 42a) detects the first magnetic characteristic of the magnetic material of the banknote to which the vertical magnetic field is applied in step S11 (step S12).

Next, the magnetic field application unit 41 (second magnet 41b) applies a horizontal magnetic field to the surface of the bill (step S13).

Next, the magnetic detection unit 42 (second magnetic sensor 42b) detects the second magnetic characteristic of the magnetic material of the banknote to which the horizontal magnetic field is applied in step S13 (step S14).

Steps S11 and S12 and steps S13 and S14 may be in order of each other. That is, steps S13, S14, S11, and S12 may be executed in this order.

Next, the control unit 50 determines the denomination and the transport state of the banknote BN based on the image of the banknote BN (and the first magnetic characteristic and the second magnetic characteristic) (step S15).

Next, the control unit 50 identifies the region where the magnetic thread MT exists based on the determination result in step S15 (step S16).

Then, the control unit 50 determines the authenticity of the banknote BN based on the first magnetic characteristic and the second magnetic characteristic detected by the magnetic detection unit 42 (step S17). More specifically, the authenticity of the bill BN is based on the first magnetic characteristic and the second magnetic characteristic detected by the first magnetic sensor 42a and the second magnetic sensor 42b corresponding to the region of the magnetic thread MT specified in step S15. To judge.

As described above, in the above embodiment, a vertical magnetic field and a horizontal magnetic field are applied to the bill, and the first magnetic property of the magnetic material of the bill to which the vertical magnetic field is applied and the magnetism of the bill to which the horizontal magnetic field is applied. An anisotropic medium can be detected by detecting the second magnetic characteristic of the body and performing the identification processing of the bill based on the detected first magnetic characteristic and the second magnetic characteristic.

In the above embodiment, the case where the magnetic field application unit 41 includes the first magnet 41a and the second magnet 41b and the magnetic detection unit 42 includes the first magnetic sensor 42a and the second magnetic sensor 42b has been described. The configuration of the unit 41 and the magnetic detection unit 42 is not particularly limited.

For example, as shown in FIG. 9, the magnetic field application unit 41 includes one magnet 41c, the first magnetic sensor 42a and the second magnetic sensor 42b are arranged on both sides of the magnet 41c, and the second magnetic sensor 42b, the magnet 41c and The first magnetic sensor 42a may be arranged in this order in the transport direction of the bill BN transported along the transport path 212. The magnet 41c is arranged so as to extend in the main scanning direction. A loop-shaped magnetic flux as shown in FIG. 9 is formed around the magnet 41c. In particular, in the vicinity of the transport surface 216, a magnetic field perpendicular to the transport surface 216 is formed above the magnet 41c, and the magnet 41c is formed. A magnetic field parallel to the transport surface 216 and a magnetic field perpendicular to the transport surface 216 are formed on both sides of the above. Therefore, the magnet 41c applies a horizontal magnetic field to the bill BN conveyed in the transport path 212 before passing through the second magnetic sensor 42b, passes through the second magnetic sensor 42b, and passes through the second magnetic sensor 42b to pass through the first magnetic sensor 42a. A vertical magnetic field is applied before passing through. Therefore, the second magnetic sensor 42b can detect the second magnetic characteristic of the magnetic material of the bill BN that has passed through the horizontal magnetic field and is magnetized in the direction parallel to the surface of the bill BN, and the first magnetic sensor 42a , It is possible to detect the first magnetic property of the magnetic material of the bill BN that has passed through the vertical magnetic field and is magnetized in the direction perpendicular to the surface of the bill BN.

Further, for example, as shown in FIG. 10, the magnetic detection unit 42 includes one magnetic sensor 42c, the first magnet 41a and the second magnet 41b are arranged on both sides of the magnetic sensor 42c, and the bill BN is located in the vicinity thereof. It may be transported so as to reciprocate. As a result, on the outbound route, a vertical magnetic field is applied to the bill BN carried on the transport path 212 by the first magnet 41a, and the magnetic material of the bill BN magnetized in the direction perpendicular to the surface of the bill BN. It is possible to detect the first magnetic characteristic of the above by the magnetic sensor 42c. Further, on the return route, a horizontal magnetic field is applied to the bill BN carried on the transport path 212 by the second magnet 41b, and the magnetic material of the bill BN magnetized in the direction parallel to the surface of the bill BN. The second magnetic characteristic can be detected by the magnetic sensor 42c.

Further, in the above embodiment, the case where the magnetic sensor according to the present invention constitutes the magnetic line sensor 40 that acquires the magnetic data (magnetic characteristics) of the bill BN in the entire width direction of the transport path 212 has been described. The magnetic sensor according to the present invention may be a point sensor that acquires magnetic data (magnetic characteristics) of a bill at one point in the width direction of the transport path 212.

Further, in the above embodiment, the magnetic thread MT is isotropic to the high high coercive force portion VA including the vertically anisotropic medium and the high high coercive force portion HA including the horizontally anisotropic medium as the high high coercive force portion HC. Although the case of providing the high high coercive force part IM including the medium has been described, the magnetic thread MT has only the high high coercive force part VA, only the high high coercive force part HA, and only the high high coercive force part IM as the high high coercive force part HC. It may include only the high and high coercive force parts VA and HA, only the high and high coercive force parts VA and IM, or only the high and high coercive force parts HA and IM. Among them, it is preferable that the magnetic thread MT includes at least one of the high high coercive force portion VA and HA as the high high coercive force portion HC, and the case where the high high coercive force portion VA or HA includes the high high coercive force portion IM. be.

Further, in the above embodiment, the case where the security element containing the magnetic material is the magnetic thread MT has been described, but the security element containing the magnetic material may be, for example, magnetic ink or a hologram.

Further, in the above embodiment, the case where the bill BN is transported in the transport path 212 in the bill processing device 200 in the lateral direction has been described, but the bill BN has a transport path in the bill processing device according to the present invention. It may be transported in the longitudinal direction.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the above embodiments. Further, the configurations of the respective embodiments may be appropriately combined or modified as long as they do not deviate from the gist of the present invention.

As described above, the present invention is a technique useful for detecting an anisotropic medium provided on paper sheets.

11, 12: Photosensor 13: Conveying mechanism 14: Hair roller 20: Optical line sensor 30: Thickness detection sensor 40: Magnetic line sensor 41: Magnetic field application unit 41a: First magnet 41b: Second magnet 41c: Magnet 42: Magnetic Detection unit 42a: First magnetic sensor 42b: Second magnetic sensor 42c: Magnetic sensor 50: Control unit 60: Storage unit 100: Bill identification device (paper leaf identification device)
200: Banknote processing device (paper leaf processing device)
210: Hopper 211: Feeding part 212: Transport path 213: Accumulation part 214: Reject part 215: Display part 215: Transport surface BN: Bill MT: Magnetic thread HC: High high magnetic force part NM: Non-magnetic part VA: Vertical anisotropic High high coercive force part including sex medium HA: High high coercive force part including horizontally anisotropic medium IM: High high coercive force part including isotropic medium

Claims (9)

A paper leaf identification device that identifies paper leaves having a security element containing a magnetic material.
A magnetic field application part that applies a first magnetic field perpendicular to the surface of paper sheets and a second magnetic field parallel to the surface of paper sheets.
A magnetic detection unit that detects the first magnetic property of the magnetic material of the paper leaf to which the first magnetic field is applied and the second magnetic property of the magnetic material of the paper leaf to which the second magnetic field is applied. When,
A paper leaf identification device comprising: a control unit that performs a paper leaf identification process based on the first magnetic characteristic and the second magnetic characteristic detected by the magnetic detection unit. The paper leaf identification device according to claim 1, wherein the magnetic field application unit includes a first magnet to which the first magnetic field is applied and a second magnet to which the second magnetic field is applied. The paper sheet according to claim 1 or 2, wherein the magnetic detection unit includes a first magnetic sensor that detects the first magnetic characteristic and a second magnetic sensor that detects the second magnetic characteristic. Identification device. The paper leaf identification according to any one of claims 1 to 3, wherein the control unit performs authenticity determination processing of the paper leaves based on the first magnetic characteristic and the second magnetic characteristic. Device. When the output waveform of the magnetic detection unit differs between the detection of the first magnetic characteristic and the detection of the second magnetic characteristic, the control unit determines that the magnetic material is an anisotropic medium. Then, when the output waveform of the magnetic detection unit is similar between the time of detecting the first magnetic characteristic and the time of detecting the second magnetic characteristic, it is determined that the magnetic material is an isotropic medium. The paper leaf identification device according to claim 4, which is characterized. The paper leaf identification according to any one of claims 1 to 5, wherein the control unit performs a denomination determination process for the paper leaves based on the first magnetic characteristic and the second magnetic characteristic. Device. The paper leaf identification device according to any one of claims 1 to 6, wherein the security element is a magnetic thread. A paper leaf processing device comprising the paper leaf species identification device according to any one of claims 1 to 7. It is a paper leaf identification method for identifying paper leaves having a security element including a magnetic substance.
The step of applying a first magnetic field perpendicular to the surface of the paper sheet,
A step of detecting the first magnetic property of the magnetic material of the paper sheet to which the first magnetic field is applied, and
A step of applying a second magnetic field parallel to the surface of the paper sheets,
A step of detecting the second magnetic property of the magnetic material of the paper sheet to which the second magnetic field is applied, and a step of detecting the second magnetic property.
A method for identifying paper leaves, which comprises a step of identifying the paper leaves based on the first magnetic characteristic and the second magnetic characteristic detected by the magnetic detection unit.

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