JP2003109064A - Medium with resonator mixed, device for detecting medium characteristic and device for discriminating truth or falsehood of medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medium which has high security and also is mixed with inexpensive resonator by mixing a non-magnetic resonator and a magnetic resonator with base material, such as paper or the like, e.g. paper money, securities, etc., and a card or the like, such as a credit card and a cash card. SOLUTION: Non-magnetic resonators 2 and a magnetic resonator 3 are mixed in the base material of a medium 1 in a fixed ratio. A medium truth/ falseness discriminating device 10 for discriminating the truth/falseness of the medium 1 detects an electromagnetic property and a magnetic property in a conveying direction of the medium 1 and discriminates whether or not to be a real medium on the basis of a relation between the properties. The cost of the medium 1 is reduced without lowering the security by mixing the non- magnetic resonators 2 and the magnetic resonator 3 with the base material in this way.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium containing a resonator and a medium containing the resonator, which is applied to papers such as banknotes and securities, cards such as credit cards and cash cards. The present invention relates to a medium characteristic detecting device for detecting the characteristic of 1. and a true / false determining device for determining the authenticity of a medium in which the resonator is mixed.

[0002]

2. Description of the Related Art Conventionally, various types of media such as papers such as banknotes and securities, cards such as credit cards and cash cards, etc. have been forged and illegally used.
Hereinafter, the forged medium is referred to as a forged medium.

The act of counterfeiting a medium can be suppressed by making it difficult to forge the medium and making it easy to discriminate whether the medium is a counterfeit medium (medium authenticity discrimination). Therefore, it has been proposed to mix a resonator such as a conductive fiber into a medium substrate (paper or resin such as PET).

As is known, a resonator has a property of electrically resonating when irradiated with an electromagnetic wave of a specific frequency and re-radiating the electromagnetic wave of the resonant frequency. The authenticity of the medium can be determined by irradiating the medium with the electromagnetic wave having the specific frequency and detecting the reflected wave from the medium. Specifically, if there is a reflected wave from the medium, it is determined as a true medium,
If there is no reflected wave, it is determined that the medium is a counterfeit medium.

However, there is a problem that the medium can be counterfeited relatively easily and the security is low only by causing the medium to resonate when it is irradiated with an electromagnetic wave of a specific frequency.

The resonance frequency of the resonator depends on its length.

In order to solve the above problems and improve security, it has been proposed that a medium (base material) be mixed with a plurality of resonators having different lengths so that the medium has an inherent frequency characteristic. The frequency characteristic referred to here is the relationship between the frequency of the electromagnetic wave with which the medium is irradiated and the magnitude of the reflected wave at that time. In this method, the frequency characteristic of each medium is registered in the center or the like when the medium is issued. In the authenticity determination, the frequency characteristic measured from the medium is compared with the frequency characteristic of the medium registered in the center or the like. If they match, it is determined to be a true medium, and if they do not match, it is a counterfeit medium. Determine that there is.

As described above, by giving each medium a unique frequency characteristic, it becomes difficult to forge the medium and the security can be improved.

It should be noted that the above frequency characteristics are not measured in the center,
A method of registering on an IC chip or a magnetic stripe provided on a medium has also been proposed.

Further, the frequency characteristic of the medium is measured by changing the frequency of the electromagnetic wave while irradiating the medium with the electromagnetic wave and detecting the reflected wave from the medium to determine the authenticity of the medium. The device has already been proposed.

[0011]

However, in this method, since the frequency characteristic must be registered for each medium to be issued when the medium is issued, there is a problem that it takes time to issue the medium and the cost of the medium increases. It was

An object of the present invention is to provide a medium having a high security and an inexpensive resonator mixed therein by purchasing a nonmagnetic resonator and a magnetic resonator as a base material. .

Another object of the present invention is to provide a medium characteristic measuring device for measuring the electromagnetic characteristic and magnetic characteristic of a medium containing the above-mentioned resonator and detecting the relationship between the measured electromagnetic characteristic and magnetic characteristic. .

Furthermore, the present invention measures the electromagnetic characteristics and magnetic characteristics of a medium containing the above-mentioned resonator, and determines the authenticity of the medium based on the relationship between the measured electromagnetic characteristics and magnetic characteristics. The purpose is to provide.

[0015]

A medium containing a resonator according to the present invention has the following constitution in order to solve the above-mentioned problems.

(1) A magnetic resonator and a non-magnetic resonator are mixed in the base material.

In the above structure, the medium has both electromagnetic wave characteristics and magnetic characteristics. The electromagnetic wave characteristic referred to here is a change in a reflected wave obtained from the medium when the medium is irradiated with an electromagnetic wave having a specific frequency. The magnetic property is a change in the magnetic field generated at a position close to the medium.

When the authenticity of a medium is determined, the characteristic peculiar to the medium is not used but the relation between the electromagnetic characteristic and the magnetic characteristic common to each medium is used. There is no need to register the characteristics, the labor required for issuing the medium can be reduced, and the cost can be reduced.

Further, since the content of the relationship between the electromagnetic wave characteristics and the magnetic characteristics used when discriminating the authenticity of the medium is not disclosed, it is practically impossible for anyone who does not know the relationship to forge the medium. And the security is high.

Further, if fibrous magnetic stainless steel or fibrous nickel is used as the resonator of the magnetic material, rust is less likely to occur and quality deterioration can be suppressed.

Similarly, if any of fibrous non-magnetic stainless steel, fibrous copper, or fibrous aluminum is used as the resonator of the non-magnetic material, rust is less likely to occur and quality deterioration can be suppressed.

(2) The magnetic resonator and the non-magnetic resonator have a predetermined length. In the above configuration, since the lengths of the magnetic resonator and the nonmagnetic resonator are constant, each resonator resonates when irradiated with an electromagnetic wave of a specific frequency.

When the permittivity of the substrate is ε, the length l of the resonator that resonates when irradiated with an electromagnetic wave of wavelength λ0 in vacuum
Is l = λ0 / (2 × √ε). Therefore, by determining the length l of the resonator based on the dielectric constant ε of the base material, it is possible to resonate when an electromagnetic wave of a specific frequency is irradiated.

Further, the medium characteristic detecting device of the present invention has the following constitution in order to detect the relationship between the electromagnetic wave characteristic and the magnetic characteristic of the medium in which the resonator is mixed.

(1) An electromagnetic wave detecting means for irradiating an electromagnetic wave to a medium conveyed in a predetermined direction and detecting a reflected wave at that time, and a change in a generated magnetic field arranged in a position close to the medium. Magnetic field detecting means for detecting the electromagnetic wave characteristics of the medium in the carrying direction obtained from the reflected wave detected by the electromagnetic wave detecting means and the carrying direction of the medium obtained from the change in the magnetic field detected by the magnetic field detecting means. Relationship detecting means for detecting a relationship with the magnetic characteristic.

In the above structure, the electromagnetic wave characteristic in the transport direction of the medium is detected by the electromagnetic wave detecting means, and
The magnetic characteristic in the transport direction of the medium is detected by the magnetic field detecting means.

From the electromagnetic wave characteristics of the medium carrying direction obtained by the electromagnetic wave detecting means, the positions where the nonmagnetic resonator and the magnetic resonator mixed in the base material of the medium exist can be detected. From the magnetic characteristics in the transport direction of the medium obtained by the magnetic field detecting means, the position where the magnetic material resonator mixed in the base material of the medium exists can be detected.

The relationship detecting means detects the relationship between the positions where the nonmagnetic resonator and the magnetic resonator are present.

Further, the authenticity discriminating apparatus of the present invention is provided with the following constitution in order to discriminate the authenticity (whether or not the medium is forged) of the medium in which the resonator is mixed.

(1) An electromagnetic wave detecting means for irradiating an electromagnetic wave on a medium conveyed in a predetermined direction and detecting a reflected wave at that time, and a change in a generated magnetic field arranged in a position close to the medium. Magnetic field detecting means for detecting the electromagnetic wave characteristics of the medium in the carrying direction obtained from the reflected wave detected by the electromagnetic wave detecting means and the carrying direction of the medium obtained from the change in the magnetic field detected by the magnetic field detecting means. An authenticity determining unit that determines the authenticity of the medium based on the relationship with the magnetic characteristics.

In the above structure, the authenticity of the medium is discriminated based on the relationship between the electromagnetic wave characteristic in the transport direction of the medium and the magnetic characteristic.

(2) The magnetic field detecting means is a differential type magnetic head.

In the above configuration, S in detecting a change in magnetic field is detected.
The / N ratio is improved.

(3) The radio wave detecting means is a Doppler module.

In the above structure, the electromagnetic wave detecting means is used in a speedometer or the like, and is composed of a Doppler module which is widely used.

(4) The authenticity determining means is operable to detect the abrupt change in the reflected wave by the electromagnetic wave detecting means more than the abrupt change in the magnetic field by the magnetic field detecting means. The medium is determined to be a true medium.

In this structure, a medium in which a nonmagnetic resonator and a magnetic resonator are mixed is determined to be a true medium.

(5) The authenticity determining means detects the abrupt change of the reflected wave by the radio wave detecting means at the position in the transport direction of the medium where the change of the magnetic field is detected by the magnetic field detecting means. , Determine that the medium is a true medium.

In the above-mentioned structure, it is determined that the magnetic medium is a true medium if it has a length that resonates when an electromagnetic wave of a specific frequency is irradiated.

(6) The authenticity determining means is preset with a ratio of the number of times the electromagnetic wave detecting means detects a sudden change in the reflected wave and the number of times the magnetic field detecting means detects a change in the magnetic field. If it is a ratio, it is means for discriminating the medium as a true medium.

In the above structure, a medium in which a non-magnetic resonator and a magnetic resonator are mixed at a preset ratio is determined to be a true medium.

(7) An AC signal of 10 kHz or more and 50 kHz or less is supplied as a bias signal for generating a magnetic field to the magnetic field detecting means.

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.

FIG. 1 is a diagram showing a medium which is an embodiment of the present invention. The medium 1 is, for example, papers such as banknotes and securities, cards such as credit cards and cash cards. The base material of the medium 1 is mixed with the nonmagnetic resonator 2 and the magnetic resonator 3 in a preset ratio. The resonators 2 and 3 are fibrous. All the resonators 2 and 3 mixed in the base material 2 have the same length l. The length l of these resonators 2 and 3 is the dielectric constant ε of the base material of the medium 1.
It is decided based on.

The length 1 of the resonators 2 and 3 will be described below.

As is well known, the resonators 2 and 3 have the property of re-emitting the electromagnetic waves of the resonator and the resonance frequency when the electromagnetic waves of the specific frequency are irradiated. The resonators 2 and 3 are
When the length is l, when an electromagnetic wave of l = λ / 2 is irradiated, it resonates and re-emits the electromagnetic wave of the resonance frequency.

Now, consider a case where the resonators 2 and 3 are resonated when an electromagnetic wave having a wavelength of λ0 in a vacuum is irradiated. The propagation velocity of a radio wave is the same as the speed of light c in a vacuum, but when the dielectric constant of the surrounding environment is ε (ε> 1), it becomes c / (√ε). Therefore, when the dielectric constant of the surrounding environment is ε, the wavelength λ is λ = λ0 / (√
ε). Therefore, the resonators 2, 3 have a length l
By setting l = λ0 / (2 × (√ε)), it is possible to re-emit an electromagnetic wave having a resonance frequency by causing resonance when an electromagnetic wave having a frequency having a wavelength of λ0 in the vacuum is irradiated. .

Thus, the length l of the resonators 2 and 3 is determined based on the dielectric constant ε of the base material of the medium 1.

The frequency f of the electromagnetic wave resonating with the resonators 2 and 3 is f = c / λ0. Also, paper or PET
The dielectric constant ε of the base material such as (polyethylene terephthalate) is about 2.

The base material of the medium 1 is a raw material (for example, if the base material is paper-like material, a viscous raw material obtained by dissolving pulp,
If the base material is a resin such as plastic, a viscous raw material in which a resin such as PET (polyethylene terephthalate) is melted), the resonator 2 of the specific magnetic material and the resonator 3 of the magnetic material are set in advance. Mixed in the ratio
This raw material is molded after being sufficiently stirred.
For this reason, the resonators 2 and 3 are present inside the molded base material 2 and may not be visible. Further, in each of the formed base materials, the nonmagnetic resonator 2 and the magnetic resonator 3 are present in the ratio of being added to the raw material. The medium 1 is obtained by printing the base material.

As described above, the medium 1 of this embodiment has the non-magnetic resonator 2 and the magnetic resonator 3 mixed in the base material, and the non-magnetic resonator 2 and the magnetic material 3 are mixed. It has both electromagnetic wave characteristics due to the resonator 3 and magnetic characteristics due to the resonator 3 of a magnetic body.

The electromagnetic wave characteristics are changes in reflected waves from the medium 1 when the medium 1 is irradiated with electromagnetic waves of a specific frequency, and the magnetic characteristics are changes in magnetic field generated at a position close to the medium 1. The electromagnetic wave characteristic and the magnetic characteristic are measured while the medium 1 is conveyed in a predetermined direction as described later.

The electromagnetic wave characteristics and the magnetic characteristics have the following relationships (1) to (3). The total number of positions where the reflected wave change appears in the electromagnetic wave characteristics is larger than the total number of positions where the magnetic field change appears in the magnetic property. At the position where the magnetic field changes in the magnetic characteristics, the reflected wave changes in the electromagnetic wave characteristics. The predetermined ratio is the ratio of the total number of positions where the reflected wave change appears in the electromagnetic wave characteristics to the total number of positions where the magnetic field change appears in the magnetic property.

It can be judged that the medium 1 satisfying all of the above relationships (1) is not a forged medium but a true medium, and the medium 1 for which any of the above relationships (1) is not satisfied is a forged medium. The reason for this will be described later.

Since the above relationships (1) to (3) are not disclosed, it is practically impossible to forge a medium that satisfies the above relationships (1) to (3). Therefore, in order to ensure security, it is not necessary to register the electromagnetic wave characteristics for each medium at the time of issuance as in the conventional case, so that the cost of issuing the medium 1 can be sufficiently suppressed.

Further, as the non-magnetic resonator 2, fibrous non-magnetic stainless steel, fibrous copper or fibrous aluminum, which is relatively inexpensive and resistant to rust, is used. Similarly, if fibrous magnetic stainless steel or fibrous nickel, which is relatively inexpensive and resistant to rust, is used, the cost of issuing the medium 1 can be further suppressed, and the time variation of the electromagnetic wave characteristics and the magnetic characteristics can be suppressed. .

Next, a medium authenticity discriminating apparatus according to an embodiment of the present invention will be described. The medium characteristic detecting device of the present invention is applied to the medium authenticity discriminating device of this embodiment. The medium authenticity discriminating apparatus of this embodiment is the medium 1 described above.
Is a device for measuring the electromagnetic wave characteristic and the magnetic characteristic and discriminating whether the medium 1 is a true medium or a counterfeit medium from the measurement result.

FIG. 2 is a block diagram showing the functional arrangement of the medium authenticity discriminating apparatus according to the embodiment of the present invention. The medium authenticity discriminating apparatus 10 of this embodiment irradiates the medium 1 conveyed by the medium conveying unit 16 in a predetermined direction with an electromagnetic wave of a specific frequency, and detects the reflected wave from the medium 1. And a magnetic field detection unit 12 arranged at a position close to the medium 12 being conveyed, for generating a magnetic field and detecting a change in the magnetic field, a detection result in the electromagnetic wave detection unit 11, a detection result in the magnetic field detection unit 12, And a relation detecting unit 13 that detects a relation between the electromagnetic characteristic and the magnetic characteristic in the conveying direction of the medium 1 from the conveying position of the medium 1 by the medium conveying unit 16, and the electromagnetic characteristic detected by the relation detecting unit 13. A genuine / counterfeit discriminating unit 14 for discriminating whether the medium 1 is a true medium or a counterfeit medium from the relationship of magnetic characteristics, and a discriminant result for outputting a discriminant result in the true / false discriminating unit 14. And a output unit 15,.

The medium characteristic detecting device according to the present invention comprises an electromagnetic wave detecting section 11, a magnetic field detecting section 12, and a relationship detecting section 13.

A specific configuration of the medium authenticity discriminating apparatus 10 according to the embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the medium authenticity discriminating apparatus according to the embodiment of the present invention. Reference numeral 21 is a CPU that controls the operation of the main body, and 22 is a memory 22 that stores data generated during operation, an operation program of the CPU 21, and the like. The memory 22 includes a known EEPROM or R
A storage element such as AM is provided.

Reference numeral 23 is a radio wave generator for generating an electromagnetic wave of a specific frequency. The electromagnetic wave generated by the radio wave generator 23 is sent to the antenna 25 by the circulator 24. Further, the circulator 24 sends the electromagnetic wave received by the antenna 25 to the radio wave detector 26. Radio wave generator 23
Is equipped with a transmission element such as a Gunn diode. The radio wave generator 23 generates an electromagnetic wave having a frequency at which the resonators 2 and 3 mixed in the base material of the medium 1 resonate and re-emit the electromagnetic wave having the resonance frequency. The radio wave detector 26 includes a receiving element such as a Schottky barrier diode. The electromagnetic wave generator 23, the circulator 24, the antenna 25, and the electromagnetic wave detector 26 constitute the electromagnetic wave detector 11.

The radio wave generator 23 generates an electromagnetic wave having a frequency at which the nonmagnetic resonator 2 and the magnetic resonator 3 in which the base material of the medium 1 is mixed resonate.

27 is a differential type magnetic head shown in FIG. Reference numeral 28 is a high frequency generator that generates a high frequency signal of 10 kHz or more and 50 kHz or less. Reference numeral 29 is a magnetic detector that extracts a change in the magnetic field from a change in the high frequency voltage detected by the magnetic head 27. The high frequency signal generated by the high frequency generator 28 is passed through the primary coil of the magnetic head 27 as a bias signal. The magnetic head 27 generates a magnetic field by the flow of the bias signal and detects a change in the magnetic field as a change in high frequency voltage.
This differential type magnetic head 27 has a frequency of 10 kHz or more, 50
An alternating current of kHz or less is applied to the primary coil as a bias signal. Since the secondary coils are differentially connected so that no output is produced in a steady state, the S / N ratio in the detection result is good.
The secondary coil is connected to the magnetic detector 29. The magnetic head 27, the high frequency generator 28, and the magnetic detector 29 constitute the magnetic field detector 12.

Reference numeral 30 is an A for converting the analog output of the radio wave detector 26 and the magnetic detector 29 into digital data.
/ D converter. Reference numeral 31 is a transport controller that controls the operation of the transport device that transports the medium 1. Transport control unit 31
Controls the transport speed of the medium 1 in the transport path. C
The PU 21 instructs the transport control unit 31 on the transport speed of the medium 1 and the like.

The above-mentioned relation detecting section 13 includes the A / D converter 3
0, CPU 21, and memory 22.
Further, the CPU 21 and the memory 22 constitute the above-mentioned authenticity determination unit 14.

Reference numeral 32 denotes a discrimination result output device for outputting the discrimination result of the medium 1 in the CPU 21. The discrimination result output device 32 constitutes the discrimination result output unit 15.

Further, the antenna 25 and the magnetic head 27 are arranged side by side in the carrying direction of the medium 1 in the carrying device. Furthermore, the magnetic head 27 is used to convey the medium 1 being conveyed.
It is located in the vicinity of.

The medium authenticity discriminating apparatus 1 of this embodiment will be described below.
The operation of 0 will be described.

The medium 1 for which the authenticity is determined is conveyed by the conveying device in the conveying direction shown in FIG. 3 at a predetermined conveying speed. The medium 1 is conveyed in the right direction shown in FIG. FIG. 5 is a flowchart showing the operation of the medium authenticity discriminating apparatus.

The medium authenticity discriminating apparatus 10 has an electromagnetic wave characteristic in the conveying direction regarding the medium 1 conveyed by the conveying apparatus.
And magnetic properties are detected (s1, s2).

The detection of the electromagnetic wave characteristic related to s1 is performed by the electromagnetic wave generator 23, the circulator 24, the antenna 25, and the electromagnetic wave detector 26 which constitute the electromagnetic wave detecting section 11. The radio wave generator 23 generates an electromagnetic wave having a frequency at which the nonmagnetic resonator 2 and the magnetic resonator 3 mixed in the base material of the medium 1 resonate and re-emit an electromagnetic wave having a resonance frequency. The electromagnetic wave generated by the radio wave generator 23 is sent to the antenna 25 by the circulator 24, and the antenna 25
The medium 1 being conveyed from is irradiated. Since the medium 1 is transported by the transport device, the electromagnetic wave irradiation position changes in the transport direction of the medium 1.

Here, if the medium 1 is a true medium, when the electromagnetic waves emitted from the antenna 25 are applied to any of the resonators 2 and 3 mixed in the base material of the medium 1, the resonator is 2 and 3 resonate and re-radiate the electromagnetic wave of the resonance frequency.
The electromagnetic waves re-emitted from the resonators 2 and 3 are received by the antenna 25 as reflected waves from the medium 1, and the circulator 2
4 to the radio wave detector 26. Radio wave detector 2
Reference numeral 6 extracts and outputs a signal of the resonance frequency of the resonators 2 and 3.

FIG. 6A shows the output signal of the radio wave detector 26. In this figure, the horizontal axis is the position in the transport direction of the medium 1, and the vertical axis is the magnitude of the reflected wave detected. Position where the non-magnetic resonator 2 exists (A, C shown in FIG. 6)
2) and the position where the magnetic resonator 3 is present (FIG. 6).
When the electromagnetic wave emitted from the antenna 25 is applied to point B), the resonators 2 and 3 to which the electromagnetic wave is applied resonate and re-emit the electromagnetic wave having the resonance frequency, so that a peak appears in this output signal. . Therefore, it can be determined that either the nonmagnetic resonator 2 or the magnetic resonator 3 is present at the position where the peak appears in the output signal of the radio wave detector 26.

The medium authenticity discriminating apparatus 10 stores in the memory 22 the digital data obtained by A / D converting the output from the radio wave detector 26 by the A / D converter 30 as electromagnetic wave characteristics in the transport direction of the medium 1.

The magnetic characteristic according to s2 is detected by the magnetic head 27, the high frequency generator 28, and the magnetic detector 29.
Done by. The magnetic head 27 is a differential type magnetic head shown in FIG. 4, and is arranged at a position close to the medium 1 being conveyed. A high frequency signal of 10 kHz or more and 50 kHz or less is supplied as a bias signal to the primary coil of the magnetic head 27 by the high frequency generator 28. Two
The secondary coils are differentially connected, and the output thereof is connected to the magnetic detector 29. The magnetic field generated by the magnetic head 27 changes as the magnetic material passes. Magnetic head 2
7 detects and outputs this change in the magnetic field.

Here, the medium 1 has the nonmagnetic resonator 2 and the magnetic resonator 3 mixed in the base material as described above. When the magnetic field generated by the magnetic head 27 passes through the magnetic resonator 3, the magnetic field changes. The magnetic head 27 detects and outputs this change in the magnetic field as a change in the high frequency voltage. The magnetic detector 29 extracts and outputs a magnetic field change signal from the output of the magnetic head 27.

A magnetic field change signal output from the magnetic detector 29 is shown in FIG. In this figure, the horizontal axis is shown in FIG.
As in (A), it is the position in the transport direction of the medium 1, and the vertical axis is the magnitude of the detected magnetic field. At the position where the magnetic resonator 3 exists (point B in FIG. 6), the magnetic field is changed by the magnetic resonator 3 and a peak appears in this output signal.

The medium authenticity discriminating apparatus 10 stores in the memory 22 the digital data obtained by A / D converting the output from the magnetic detector 29 by the A / D converter 30 as magnetic characteristics in the transport direction of the medium 1.

The medium authenticity discriminating apparatus 10 detects the position in the transport direction of the medium 1 where the nonmagnetic resonator 2 and the magnetic resonator 3 exist from the electromagnetic wave characteristics stored in the memory 22 (s3). ). Further, the medium authenticity discriminating apparatus 10 detects the position in the transport direction of the medium 1 where the magnetic resonator 3 is present from the magnetic characteristics stored in the memory 22 (s4).

Next, the medium authenticity discriminating apparatus 10 uses the memory 2
It is determined whether or not the above relationships (1) to (3) are established between the electromagnetic wave characteristics stored in 2 and the magnetic characteristics.

At s5, it is determined whether the total number of positions where the reflected wave change appears in the electromagnetic wave characteristics is larger than the total number of positions where the magnetic field change appears in the magnetic property.
As described above, the medium 1 is mixed with the nonmagnetic resonator 2 and the magnetic resonator 3. The position where the change (peak) of the reflected wave appears in the electromagnetic wave characteristics is a resonator 2 of a non-magnetic material having a predetermined length l (a length l resonating with an electromagnetic wave of a frequency generated by the radio wave generator 23) or This is the position in the transport direction of the medium 1 in which the magnetic resonator 3 is present. On the other hand, the position where the change (peak) of the magnetic field appears in the magnetic characteristics is the position in the transport direction of the medium 1 in which the magnetic resonator 3 is present.

That is, at s5, it is judged whether or not the medium is a mixture of the nonmagnetic resonator 2 and the magnetic resonator 3.

Since the medium 1 is mixed with the nonmagnetic resonator 2 and the magnetic resonator 3 having the predetermined length l as described above, the above relationship is established if the medium is a true medium.

Therefore, at s5, the non-magnetic resonator 2 is used.
A medium in which is not mixed in the substrate, a medium in which the magnetic resonator 3 is not mixed in the substrate, or the like is detected as a counterfeit medium.

At s5, it is determined that the medium is a counterfeit medium even when there is no position where a peak appears in either the electromagnetic characteristic or the magnetic characteristic.

Further, at s6, it is judged whether or not the position in the carrying direction where the change (peak) of the magnetic field appears in the magnetic characteristic is the position where the change of reflected wave appears in the electromagnetic characteristic. The position where the change in the electromagnetic wave characteristic appears is the position in the transport direction of the medium 1 in which the magnetic resonator 3 is present, and this position is also the position where the peak appears in the electromagnetic wave characteristic. Here, when no peak appears in the electromagnetic wave characteristic, the magnetic resonator 3 existing at this position has a length that does not resonate when an electromagnetic wave having a frequency generated by the radio wave generator 23 is irradiated. Therefore, this medium 1 is determined to be a counterfeit medium.

Further, in s7, it is determined whether or not the ratio of the total number of positions where the reflected wave change appears in the electromagnetic wave characteristic and the total number of positions where the magnetic field change appears in the magnetic characteristic is a predetermined ratio. As described above, since the nonmagnetic resonator 2 and the magnetic resonator 3 are mixed in the base material of the medium 1 at a preset ratio, the reflected wave of the electromagnetic wave characteristics The ratio of the total number of positions where the change appears and the total number of positions where the magnetic field changes in the magnetic characteristics is constant. For example, if the ratio of the nonmagnetic resonator 2 and the magnetic resonator 3 mixed in the base material is 2 to 1, the total number of positions where the reflected wave change appears in the electromagnetic wave characteristics. The ratio (predetermined ratio) to the total number of positions where the magnetic field changes in the magnetic characteristics is 3: 1. Therefore, a medium in which the ratio of the total number of positions where the reflected wave change appears in the electromagnetic characteristics and the total number of positions where the magnetic field change appears in the magnetic characteristics is not a predetermined ratio is a counterfeit medium.

In s5, s6, and s7, since the authenticity is determined based on the common characteristics of each medium 1, each medium 1 has its own characteristic registered at the time of issuance as in the conventional case. There is no need. Therefore, the labor required for issuing the medium 1 can be reduced, and the cost of the medium 1 can be reduced.

The medium authenticity discriminating apparatus 10 has the above s5.
If all of the above conditions 1 to 4 are satisfied in s7, it is determined that the medium is a true medium (s8). On the contrary, if any of the above conditions (1) to (4) is not satisfied, it is determined that the medium is a counterfeit medium (s9). The medium discrimination device 10 outputs the discrimination result at the discrimination result output device 32 (s10), and ends this processing. The discrimination result output device 32 is the medium 1 for discriminating the authenticity.
It may be configured to display whether or not the counterfeit medium is a counterfeit medium, or may be configured to give a voice warning when it is determined that the counterfeit medium is a counterfeit medium.

As described above, the medium authenticity discriminating apparatus 10 of this embodiment properly determines the authenticity of the medium 1 in which the nonmagnetic resonator 2 and the magnetic resonator 3 are mixed in the base material. Can be determined.

In the above embodiment, the electromagnetic wave detector 1 is also provided.
1 is a radio wave generator 23, a circulator 24, an antenna 2
5 and the radio wave detector 26, this configuration may be replaced with a well-known Doppler module that mainly has a transmitter element such as a Gunn diode and a receiver element such as a Schottky barrier diode and mainly uses the speedometer. This Doppler module is in widespread use. As a result, the labor required for assembling the apparatus body is reduced, and the cost of the medium authenticity determination apparatus 10 is reduced.

[0092]

As described above, according to the present invention, since the nonmagnetic resonator and the magnetic resonator are mixed, the cost of the medium can be reduced without lowering the security.

The medium characteristic detecting device of the present invention can detect the relationship between the electromagnetic wave characteristic and the magnetic characteristic of the medium.

Further, according to the medium authenticity discriminating apparatus of the present invention, it is possible to properly discriminate the authenticity of the medium.

[Brief description of drawings]

FIG. 1 is a diagram showing a medium according to an embodiment of the present invention.

FIG. 2 is a diagram showing a functional configuration of the authenticity determination device according to the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a true / false determination device according to an embodiment of the present invention.

FIG. 4 is a diagram showing a differential type magnetic head.

FIG. 5 is a flowchart showing an operation of the authenticity determining device according to the embodiment of the present invention.

FIG. 6 is a diagram showing electromagnetic wave characteristics and magnetic characteristics of the medium according to the embodiment of the present invention.

[Explanation of symbols]

1-medium 2-Nonmagnetic resonator 3-Magnetic resonator 10-Medium authenticity discrimination device 11-Electromagnetic wave detector 12-Magnetic field detector 13-Media characteristic detection unit 14-Authenticity discrimination unit 15-Discrimination result output section 16-Media transport section 21-CPU 22-memory 23-Radio wave generator 24-circulator 25-antenna 26-Radio wave detector 27-magnetic head 28-high frequency generator 29-Magnetic detector 30-A / D converter 31-Transport controller 32-Discrimination result output device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kosaku Nagashima             23-23 Honmachi, Itabashi-ku, Tokyo Lintec Co., Ltd.             Inside the company (72) Inventor Yuichi Iwakata             23-23 Honmachi, Itabashi-ku, Tokyo Lintec Co., Ltd.             Inside the company F term (reference) 2C005 HA02 HB09 HB10 JB23                 3E041 AA03 BA07 BB07 BC06 CA06                       EA02                 5B035 AA15 BA03 BB02 BB09 BC00                       CA01

Claims (14)

[Claims] 1. A medium in which a resonator made of a magnetic material and a resonator made of a non-magnetic material are mixed in a substrate. 2. The medium containing the resonator according to claim 1, wherein the resonator of the magnetic material is fibrous magnetic stainless steel or fibrous nickel. 3. The medium containing the resonator according to claim 1, wherein the non-magnetic resonator is any one of fibrous non-magnetic stainless steel, fibrous copper, and fibrous aluminum. 4. The medium containing the resonator according to claim 1, wherein the magnetic resonator and the non-magnetic resonator have predetermined lengths. 5. The medium containing a resonator according to claim 4, wherein the predetermined length is a length determined based on a dielectric constant of the base material. 6. An electromagnetic wave detecting means for irradiating a medium conveyed in a predetermined direction with an electromagnetic wave and detecting a reflected wave at that time, and a magnetic field which is arranged in a position close to the medium and changes a generated magnetic field. Magnetic field detecting means for detecting, electromagnetic wave characteristics in the carrying direction of the medium obtained from the reflected wave detected by the electromagnetic wave detecting means, and magnetism in the carrying direction of the medium obtained from changes in the magnetic field detected by the magnetic field detecting means. A medium characteristic detecting device comprising: a relation detecting means for detecting a relation with a characteristic. 7. The base material of the medium comprises a magnetic resonator,
7. The medium characteristic detecting device according to claim 6, wherein a nonmagnetic resonator is mixed. 8. An electromagnetic wave detecting means for irradiating a medium conveyed in a predetermined direction with an electromagnetic wave and detecting a reflected wave at that time, and a magnetic field which is disposed in a position close to the medium and which changes a generated magnetic field. Magnetic field detecting means for detecting, electromagnetic wave characteristics in the carrying direction of the medium obtained from the reflected wave detected by the electromagnetic wave detecting means, and magnetism in the carrying direction of the medium obtained from changes in the magnetic field detected by the magnetic field detecting means. An authenticity discriminating apparatus comprising: an authenticity discriminating unit which discriminates the authenticity of the medium based on the relationship with the characteristics. 9. The authenticity determining device according to claim 8, wherein the magnetic field detecting means is a differential type magnetic head. 10. The authenticity discrimination device according to claim 8, wherein the radio wave detection means is a Doppler module. 11. The authenticity determining means sets the medium as a true medium when the number of times the change in the reflected wave is detected by the electromagnetic wave detecting means is larger than the number of times the change in the magnetic field is detected by the magnetic field detecting means. Claims 8 to 10 that determine that there is
The authenticity determination device according to any one of 1. 12. The authenticity determining means, when the change in the reflected wave is detected by the radio wave detecting means at the position in the transport direction of the medium where the change in the magnetic field is detected by the magnetic field detecting means, the medium is detected. The authenticity determining device according to any one of claims 8 to 11, which determines that the medium is a true medium. 13. The authenticity determination means may set a ratio of the number of times the reflected wave change is detected by the electromagnetic wave detection means and the number of times the magnetic field change is detected by the magnetic field detection means to a preset ratio. For example, the authenticity determining device according to any one of claims 8 to 12, which is a means for determining that the medium is a true medium. 14. The authenticity determining device according to claim 8, wherein an AC signal of 10 kHz or more and 50 kHz or less is supplied as a bias signal for generating a magnetic field to the magnetic field detecting means.