JPH0899493A - Magnetic information recording medium - Google Patents

Abstract

PURPOSE: To provide a magnetic information recording medium capable of being manufactured at low costs, having good workability, a random property and security, and also capable of reading by the use of relatively simple device with high reading accuracy. CONSTITUTION: The base material 2 made up of paper has a filler layer 3 and a magnetic data nart 4 representing the analog magnetic inherent information of a magnetic information recording medium in use of magnetic ink containing magnetic particles and non-magnetic particles having an average particle diameter larger than that of magnetic particles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for preventing counterfeiting, falsification, and alteration of paper information recording media such as tickets, commuter tickets, admission tickets, and various securities, and more specifically, security for these paper information recording media. Regarding the provision of magnetic data. )

[0002]

2. Description of the Related Art In recent years, a paper information recording medium has been widely used as an information recording medium, and generally includes a ticket, a commuter ticket, a voting ticket, a gift certificate, a security, and the like. Each of these has an information recording section including a magnetic recording layer and an optically readable recording layer, and various information is recorded according to the application. For example, the display information / ID information of the information recording medium, the information of the holder of the information recording medium, or the information on money. In particular, those used for the above purposes are supplied at low cost, and it is required that the determination as to whether the information recording medium is legitimate can be made reliably at low cost.

Generally, since the means for confirming the authenticity of an information recording medium can easily read and write the information recorded on the information recording medium, the contents of the recorded information are illegally artificial. May change to Therefore, as a countermeasure against fraud in these information recording media, in magnetic recording, it is possible to prevent the use of commonly available reader / writers by using high coercive force magnetic recording or magnetic shield that enables reading and writing with a special magnetic head. In addition, by implementing holograms (holograms having information such as patterns or barcodes) and using special inks such as infrared absorption or infrared reflection and fluorescent color development, a means to optically identify the genuine product is implemented. It has been. However, the effect of these conventional security measures is weak at present. In particular, when the security information for determining authenticity is used for all information recording media that are issued in one way, there is a risk that the security information may be decrypted or imitated, and there is a high possibility of forgery, falsification, and alteration. . Therefore, there is a demand for a means for reliably preventing a fraudulent act of deciphering the information recorded on the information recording medium and re-entering the information on the forged or legitimate information recording medium.

As a means for preventing fraudulent acts such as forgery, alteration and falsification of such an information recording medium, and illegal use thereof, for example, stainless steel is disclosed in a check document disclosed in Japanese Patent Publication No. 63-501250. There is a technique in which fibers are randomly distributed and checked by microwaves. In this method, microwaves are incident on fine stainless fibers randomly distributed in a document, and a digital mark whose response microwave flux is determined by a certain rule is recorded on the document. When judging the authenticity of a document, a microwave is incident on the document, and the digital mark determined according to the response microwave flux is compared and collated with the above-mentioned digital mark. To judge.

However, in the above technique, the processing technique for dispersing the conductive metal fiber in the information recording medium is difficult, so that the cost is high. Further, the microwave of the gigahertz band used for reading this information recording medium is difficult to control and has a large reading error. Specifically, microwaves are transmitted or reflected in a random pattern of stainless fibers to obtain data unique to the pattern, and this data is approximated to a correlation coefficient to determine identity. In this case, it is extremely difficult to set the correlation coefficient in order to enable highly accurate judgment, and it is not practical. Further, there is a drawback that the microwave reading device itself becomes large and complicated.

On the other hand, there is an idea to make a random pattern of a magnetic material to realize the same thing as the microwave. There are the following three typical methods for producing this magnetic random pattern. First of all
There is a method of using magnetic metal fibers for dispersion. FIG. 8 is a schematic view showing a cross section of an example of the information recording medium according to this method. For example, as shown in FIG. 9, magnetic metal fibers 43 are provided dispersedly on a base material 42. As a second method, there is a method of filling a polymer material with a magnetic material instead of the magnetic metal fiber in the first method and dispersing the polymer material as a polymer magnetic fiber. As a third method, a pattern made of irregular magnetic ink is printed, transferred, printed (ink jet,
There is a method of providing it by a method such as electrostatic printing. FIG. 9 is a schematic view showing a cross section of an example of the information recording medium according to this method. For example, as shown in FIG. 9, in the information recording medium according to this method, a pattern 44 made of magnetic ink is printed on the base material 42.

[0007]

However, each of the methods has the following problems. In the case of the first method, in addition to the high cost of the magnetic metal fiber, there is also a problem in workability. When cutting the metal fiber, the teeth of the cutter are damaged, and when processed into a medium, burrs and Mustache may occur. In the case of the second method, it is possible to handle only large lots from the production of polymer magnetic fibers to dispersion, and the small lots are not suitable for high cost as in the first method. In the case of the third method, the cost is relatively low, but the magnetic pattern rises, and the pattern may be easily discriminated from the outside. In addition, since it is an artificial magnetic pattern, it is highly possible that the same pattern will be formed, and there is a surface lacking randomness.

Therefore, the present invention has been made in view of the above circumstances, can be produced at low cost, has good processability, randomness of a pattern serving as unique information, and has good security against forgery / alteration / alteration, Moreover, it is an object of the present invention to provide a magnetic information recording medium which can be read by a relatively simple device and has high reading accuracy.

[0009]

A magnetic information recording medium according to a first aspect of the present invention is provided with a sealing layer, magnetic particles and magnetic particles thereof on at least one surface of a substrate made of paper. It is characterized in that a magnetic data section representing magnetic unique information formed by non-magnetic particles having a large average particle size is sequentially provided.

In a magnetic information recording medium according to a second aspect of the present invention, a sealing layer, magnetic particles and an average particle size larger than the magnetic particles are provided on at least one surface of a paper base material made of paper. A magnetic data section representing magnetic unique information formed by the non-magnetic particles having the magnetic data section sequentially provided, and at least a part of the outermost layer of the base material is provided with digital information representing the magnetic unique information information. .

Further, according to the second aspect of the present invention, it is possible to provide a magnetic recording portion on at least a part of the outermost layer of the substrate and to record digital information representing magnetic unique information on the magnetic recording portion. .

[0012]

The magnetic data portion of the magnetic information recording medium according to the present invention can be formed using, for example, a magnetic ink containing magnetic particles, non-magnetic particles having an average particle size larger than the magnetic particles, and a binder. . Magnetic particles having a small particle size can be dispersed relatively uniformly in the magnetic ink. On the other hand, non-magnetic particles having a large particle size are non-uniformly dispersed in the magnetic ink. Here, the non-magnetic particles having a large particle size are
Non-magnetic particles alone and aggregates thereof are meant. Due to the influence of non-magnetic particles dispersed non-uniformly, magnetic unevenness occurs in the layer obtained by applying the magnetic ink. This unevenness becomes the analog magnetic unique information of the magnetic information recording medium of the present invention.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of a magnetic information recording medium of the present invention,
2, 3, and 4 are cross-sectional views of magnetic information recording media of other embodiments, and FIG. 5 is an example in which the digital information recording portion of the magnetic information recording medium of the present invention is tampered with and a magnetic information recording medium. 7 is a diagram showing an example of a dead copy of the digital information recording unit of FIG. 7 onto another magnetic information recording medium, and FIG. 6 is a diagram showing a state when it is determined to be true in the authenticity determination according to the present invention, and FIG. FIG. 6 is a diagram showing a state when it is determined to be true in the authenticity determination according to the present invention.

The magnetic information recording medium 1 of the present invention shown in FIG. 1 comprises a base material 2 on which a sealing layer 3 and a magnetic data section 4 representing magnetic unique information are formed, and the outermost surface of the base material 2 is formed. A digital information recording unit 6 for recording magnetic unique information information as digital information and a pattern printing layer 7 are provided.

As another embodiment, the magnetic information recording medium 11 shown in FIG. 2 has a base layer 2 on which a sealing layer 3 and a magnetic data section 4 representing magnetic unique information are formed, and the magnetic data section 4 is concealed. The concealing layer 5 is provided. On the magnetic information recording medium 11, a digital information recording section 6 for recording as digital information indicating magnetic unique information information and a pattern printing layer 7
Are formed.

The digital information recording section 6 and the pattern printing layer 7 can be provided not only on the same surface side of the magnetic information recording media 1 and 11, but also on different surfaces or on both surfaces. Further, the digital information recording section 6 may be any recording means capable of recording digital information and capable of being mechanically read. For example, from an optical bar code, a magnetic recording layer, a magnetic bar code, an IC memory or the like. It may be appropriately selected.

As still another embodiment, the magnetic information recording medium 21 shown in FIG. 3 comprises a base material 2 and a sealing layer 3 and a magnetic data section 4 representing magnetic unique information. Is a magnetic recording layer capable of magnetically recording digital information indicating magnetic unique information.

A magnetic information recording medium 31 shown in FIG. 4 has a base layer 2, a sealing layer 3, and a magnetic data section 4 representing magnetic unique information.
And a digital information recording section 6 (magnetic recording layer) for recording digital information indicating magnetic unique information is formed on the magnetic data section 4. In addition, the same numbers are used for the portions having the same configuration in the drawings of the above-described embodiments.

Next, each structure will be described. The base material 2 is a commonly used material such as high-quality paper, coated paper, synthetic paper, etc., and is particularly used as ticket base paper, ticket paper,
Paper card paper or the like can be used, and it can be appropriately selected from the above materials in consideration of the physical properties required for the application, such as strength, rigidity, hiding power, and light opacity.

The sealing layer 3 is provided to prevent ink or paint from seeping into the paper base material when the magnetic data layer 4 is formed, and is made of, for example, acrylic resin, urethane resin or polyester resin. , An organic polymer resin such as an epoxy resin or a vinyl chloride vinyl acetate copolymer resin, or an inorganic material such as silicon oxide, aluminum oxide, metallic aluminum or tin. Further, the filling layer 3 also has an effect of improving the adhesiveness between the magnetic data layer 4 and the substrate 2.

The concealment layer 5 is provided to conceal the magnetic data portion 4 as necessary, and improves the reading accuracy of the optical bar code provided on the upper surface of the concealment layer 5, or is a magnetic data layer in terms of design. 4 is for making it invisible, for example, a coating liquid in which a non-magnetic metal thin film, a non-magnetic metal powder is dispersed in a synthetic resin or a coating liquid in which a non-magnetic hiding pigment is dispersed in a synthetic resin or the like. Can be used. Although not shown, a protective layer for protecting the magnetic information recording medium from scratches and dust may be provided on the outermost layer of the magnetic information recording medium, if necessary, within a range that does not affect reading / writing of information and the like.

The magnetic data section 4 comprises at least magnetic particles (not shown) and non-magnetic particles (not shown) having an average particle size larger than the magnetic particles. For example, as magnetic ink, acrylic, polyester, nitrocellulose, It is formed in a state where it is arbitrarily dispersed in a binder such as a polymer resin such as vinyl chloride vinyl acetate. That is, the magnetic particles having a small particle size are relatively uniformly dispersed in the magnetic ink, whereas the non-magnetic particles having a large particle size are non-uniformly dispersed in the magnetic ink, so that the non-uniformly dispersed non-magnetic particles are dispersed. Due to the influence of the magnetic particles, magnetic unevenness occurs in the layer coated with the magnetic ink. This unevenness becomes the analog magnetic unique information of the magnetic information recording medium of the present invention. The large non-magnetic particles mean non-magnetic particles alone and aggregates thereof.

The magnetic data portion 4 having the analog magnetic unique information can be easily and randomly created by ordinary full surface coating or solid printing without intentionally creating a magnetic pattern as in the printing method. .

The magnetic unevenness in the magnetic information recording medium of the present invention is preferably about 10 to 50 μm. Since the resolution of a magnetic sensor for reading such analog magnetic unique information is generally about 20 μm or more, if the magnetic unevenness is more preferably 20 μm or more, it is read as magnetic unique information (security magnetic data). Is easy.

In order to produce such magnetic unevenness of 20 μm or more, it is preferable that the magnetic particles used have an average particle size of 10 μm or less and the non-magnetic particles have a particle size of 2 μm or more. . If the magnetic particles exceed 10 μm,
Uniform dispersion tends to be difficult, and non-magnetic particles are 2μ
If it is less than m, it tends to be difficult to form magnetic unevenness of 20 μm or more. More preferably, the magnetic particles have an average particle diameter of 0.5 to 10 μm, and the non-magnetic particles have an average particle diameter of 2 to 40 μm. The average particle size of magnetic particles is
If the particle size is less than 0.5 μm, the particles tend to agglomerate and are difficult to disperse uniformly, the suitability for printing coating is poor, and the physical properties of the magnetic coating film tend to be poor.
If it exceeds μm, it tends to be protrusions when formed into a coating film, and there is a tendency that the substrate suitability as a medium such as laminating property, running property, and slip property is deteriorated.

Further, the non-magnetic particles have a ratio of 1 to the magnetic particles.
It is preferably 0 μm or more. If it is 10 μm or more, there is an advantage that it is easy to create magnetic unevenness that can be read by a sensor. However, if it is less than 10 μm, the uniformity of magnetic particles tends to be poor, and magnetic unevenness tends to be difficult to form.

When a scale-like material is used as the non-magnetic material, it can be sufficiently used even if the average particle diameter is 40 μm or more, but its thickness should not exceed the thickness of the coating layer. Is preferred.

The shape of the nonmagnetic powder may be scale-like (flake-like), needle-like, spherical, amorphous, or boat-like, and the shape is not particularly limited. In particular, a scale-shaped material having a small thickness and a large shape can be preferably used because it is convenient because the thickness of the magnetic data portion can be reduced.

As a method for non-uniformly dispersing the non-magnetic material, non-magnetic powder having a large particle size distribution is used (for example, in the range of 0.5 to 10 μm), and the average particle diameter is 10 μ.
In the case of a non-magnetic powder having a particle size distribution of m or less and a small particle size distribution, the dispersion is intentionally softened without dispersing the primary particles to leave an aggregate of 10 μm or more, and a large non-magnetic particle of 10 μm or more is used. Etc. are possible.

The magnetic material is γ-ferrite, magnetite, Mn ferrite, Mn-Zn ferrite, C
o Various iron oxides such as deposited γ-ferrite, crystalline single metals such as Ni and Fe, crystalline alloys such as permalloy (Ni—Fe alloy), and amorphous alloys such as FeNiB and FeCoB may be used. The material of the non-magnetic material is SiO ₂ ,
Oxides such as Al ₂ O ₃ and metal salts such as magnesium silicate,
Various particles such as metal soaps such as zinc stearate and magnesium stearate, organic substances such as carbon, graphite and polymer particles, and non-magnetic flake-shaped metal particles can be used in the present invention.

The coercive force of magnetic materials is generally soft (60 Oe or less) and semi-hard (60 to 200 Oe).
e) and hard materials (200 Oe or more), any magnetic material having a coercive force can be used in the present invention.

In particular, the magnetic particles are hard to see through the magnetic pattern if the coercive force is 60 Oe or less. In addition, since there is no need for magnetization, there is an advantage that recognition is possible with a low bias magnetic field.

On the other hand, when the magnetic particles have a coercive force exceeding 60 Oe, the magnetic data section 6 using the magnetic particles can further record digital magnetic information.
Therefore, the magnetic data section 6 using the magnetic particles having a coercive force of more than 60 Oe can be used as a magnetic data section and a digital information data section which can also record digital information representing magnetic unique information. There is an advantage.

Further, when two or more kinds of magnetic powders having different coercive forces are mixed, a special material system is formed, and reading / writing can be performed under different bias magnetic fields, and the amount of information can be increased, thereby greatly improving security. There is an advantage that you can.

The filling amount of the non-magnetic material may be arbitrary and may be high filling or low filling as long as the magnetic material is not uneven.
However, it is not preferable to uniformly disperse the non-magnetic material of very fine particles with high filling, because it is difficult to make unevenness of the non-magnetic material.

As described above, the magnetic data portion 4 is once processed into another functional medium such as a transfer foil or a seal and then transferred to the base material, or is directly coated or printed on the base material using the magnetic ink. Any of the above methods may be used, and it is possible to provide the one which is relatively inexpensive and has excellent workability, in which it is difficult to easily recognize magnetic unevenness, and which has extremely excellent randomness.

As a method of reading the magnetic data section 4,
Known magnetic sensor (magnetic head, magnetoresistive sensor)
In the case of a hard material (coercive force of 200 Oe or more), the unevenness of the residual magnetization of the magnetic material is read after magnetizing once, or an external bias magnetic field is applied if it is a semi-hard material (coercive force of 60 to 200 Oe) or less. However, by reading the unevenness of the magnetic flux, it is possible to obtain information peculiar to the medium. The analog information peculiar to the medium thus obtained is converted into digital information by AD conversion, and the digital information recording unit 6 [magnetic recording (magnetic recording unit 8 in the figure), magnetic bar code, optical bar code, OC
R, MICR, IC memory, optical memory, etc. (not shown)
When the magnetic information recording medium is used, both are read and authenticity is determined by a correlation coefficient or the like.

The above-mentioned magnetic information recording medium has the following structure on the substrate 2.
It has a structure in which a digital information recording section 6 for recording digital information indicating magnetic unique information and a magnetic data section 4 are formed. The magnetic data section 4 has unique magnetic information due to non-uniform magnetic material distribution as information that cannot be visually identified. The output waveform of the magnetic data unit 4 is read by a magnetic sensor such as a magnetic head, the unique magnetic information is recognized, AD conversion is performed, and digital information is recorded in the digital information recording unit 6. Although the magnetic stripe is used here, other digital recording such as barcode, OCR, MICR, digital information recording by IC memory or optical memory can be used.

At the time of transaction, the output waveform of the magnetic data section 4 having a non-uniform magnetic material distribution is read, and compared with the encoded information recorded digitally in the digital information recording section 6 to verify and verify the trueness of the magnetic information recording medium. Make a false decision. For example, FIG. 6 shows an example in which the magnetic information recording medium of FIG. 1 has been tampered with. When the digital information recording unit 6 (magnetic stripe) in (a) is tampered with, the tampered information in the digital information recording unit 6'and the information in the magnetic data unit 4 are not collated and the transaction is stopped. (B) When the information in the digital information recording unit 6 is dead copied to another magnetic information recording medium, the dead copied digital information recording unit 6 ″
Information is not collated with the unique information corresponding to the magnetic data portion 4'of another magnetic information recording medium, and the transaction is stopped.

As described above, in the authenticity determining method of the present invention, since the magnetic information recording medium used has the security magnetic data peculiar to the medium which is hard to be copied, it is hard to be tampered with and the data on the magnetic stripe and the visible Even if the optical bar code, or the data in the OCR, MICR, IC memory or optical memory is falsified, if it is collated with the magnetic unique information existing on the base material of the magnetic information recording medium, it becomes an untrue magnetic information recording medium. It's easy to find out.

Further specific examples of the present invention will be described below. <Embodiment 1> FIG. 1 is a sectional view of a magnetic information recording medium according to a first embodiment of the present invention. Magnetic information recording medium 1
Is a coated paper (157 g / m ² ) having a size of 5.4 × 8.6 cm and a thickness of about 0.25 mm, which is used as the base material 2. On one surface of the coated paper, a sealing layer 3 having the following composition is applied in an amount of 2 g. / M
^The magnetic data part 4 is formed by a gravure coater so as to be ² and is formed by magnetic particles composed of the following composition and non-magnetic particles having an average particle size larger than the magnetic particles. It was formed by a gravure coater so as to be / m ² . The other base material 2
Visual information such as display information of the digital information recording unit 6 and the magnetic information recording medium 1 in which the magnetic unique information represented by the magnetic data unit is recorded as digital information on the surface, holder information, or information about money, or a pattern / design. Etc. as the pattern printing layer 7
It can be printed and formed on the substrate 2. In this embodiment, the digital information recording portion 6 is formed as an optical barcode by a transfer ribbon made of a visible or invisible recording material,
The pattern print layer 7 was formed by gravure printing which is a known method.

○ Sealing layer composition Curable polyester resin (Chemit 598) 10 parts Isocyanate 2 parts ○ Magnetic data part composition Magnetic particles: Mn-Zn ferrite 8 parts (Amorphous shape, average particle size 1.5 μm, coercive force) 30 Oe) Non-magnetic particles: Acrylic beads 1 part (flat shape, particle size distribution 10 to 50 μm) Binder: Vinyl acetate / urethane system 2 parts

<Embodiment 2> FIG. 2 is a sectional view of a magnetic information recording medium 11 according to a second embodiment of the present invention. The magnetic information recording medium 1 has a size of 5.2 × 9.2 cm and a thickness of about 0.
A 25 mm coated paper (157 g / m ² ) was used as the substrate 2, and a sealing layer 3 having the following composition was formed on one surface of the substrate 2 by a gravure coater so that the coating amount was 2 g / m ^2. 3, a magnetic data part 4 representing magnetic unique information formed by magnetic particles composed of the following composition and non-magnetic particles having an average particle size larger than that of the magnetic particles is applied to the gravure coater so that the coating amount is 35 g / m ^2. And a concealing layer 5 having the following composition was formed on the magnetic data portion 4 by a gravure coater. Further, on the concealing layer 5, a digital information recording portion 6 in which magnetic unique information represented by a magnetic data portion is recorded as digital information is formed as an optical barcode by a transfer ribbon (HD ribbon) made of a visible or invisible recording material. Further, on the other surface of the base material 2, visual information such as display information, holder information, or information about money, patterns, designs, etc. were formed as a pattern printing layer 7 by screen printing which is a known method.

○ Sealing layer composition Curable polyester resin (Chemit 598) 10 parts Isocyanate 2 parts ○ Magnetic data part composition Magnetic particles: Ni particles 10 parts (scaly shape, thickness 1 μm, average particle size 5 μm, coercive force 50 Oe ) Non-magnetic particles: Magnesium silicate 1 part (scaly, thickness 1 μm, particle size distribution 1 to 20 μm) Binder: vinyl acetate / urethane type 2 parts ○ Concealment layer composition vinyl chloride / vinyl acetate 5 parts titanium oxide 5 parts

<Embodiment 3> FIG. 3 is a sectional view of a magnetic information recording medium 21 according to a third embodiment of the present invention. The magnetic information recording medium 1 has a dimension of 5.7 × 8.6 cm and a thickness of about 0.
A 25 mm coated paper (157 g / m ² ) was used as the substrate 2, and a sealing layer 3 having the following composition was formed on one surface of the substrate 2 by a gravure coater so that the coating amount was 3 g / m ² and the sealing layer was formed. 3, a magnetic data part 4 representing magnetic unique information formed by magnetic particles composed of the following composition and non-magnetic particles having an average particle size larger than that of the magnetic particles is applied to the gravure coater so that the coating amount is 30 g / m ^2. Formed by. In particular, the magnetic data portion 4 made of this composition can be used as a magnetic recording layer which also serves as the digital information recording portion 6 which records the magnetic characteristic information represented by the magnetic data portion 4 as digital information. Further, on the other surface of the base material 2, visual information such as display information, holder information, or information about money, patterns and designs were formed as a pattern printing layer 7 by gravure printing which is a known method.

○ Sealing layer composition Curable vinyl chloride-vinyl acetate copolymer resin 10 parts Isocyanate 3 parts ○ Magnetic data part composition Magnetic particles: Co-γ-iron oxide 10 parts (Needle-shaped long axis 1 μm Coercive force 650 Oe ) Nonmagnetic particles: Al 1 part (scaly, thickness 1 μm, particle size distribution 1 to 20 μm) Binder: vinyl acetate / urethane 2 parts

<Embodiment 4> FIG. 4 is a sectional view of a magnetic information recording medium 11 according to a fourth embodiment of the present invention. The magnetic information recording medium 1 has a size of 5.4 × 8.6 cm and a thickness of about 0.
A 25 mm coated paper (157 g / m ² ) was used as the substrate 2, and a sealing layer 3 having the following composition was formed on one surface of the substrate 2 by a gravure coater so that the coating amount was 3 g / m ² and the sealing layer was formed. 3, magnetic data part 4 representing magnetic unique information formed by magnetic particles composed of the following composition and non-magnetic particles having an average particle size larger than the magnetic particles is gravure printed so that the coating amount is 30 g / m ^2. Formed by
A magnetic recording layer having a composition of 40 g / m ² was applied as the digital information recording section 6 on the magnetic data section 4 for recording the magnetic characteristic information represented by the magnetic data section 4 having the following composition as digital information.
Was formed by a gravure coater. Further, on the other surface of the base material 2, display information is provided as a pattern printing layer 7,
Visible information such as holder information or money information, patterns, designs, etc. are formed by gravure printing, which is a known method.

○ Sealing layer composition Curable vinyl chloride-vinyl acetate copolymer resin 10 parts Isocyanate 3 parts ○ Magnetic data part composition Magnetic particles: magnetite 10 parts (Amorphous mean particle size 0.5 μm, coercive force 50 Oe) Non Magnetic particles: Mica 1 part (scaly, thickness 0.5 μm, average particle size 30 μm) Binder: Vinyl acetate / urethane 2 parts

Regarding the above-mentioned first to fourth embodiments, the analog information of the magnetic data part, which is the security data peculiar to each medium, is converted into digital information by AD conversion and recorded in the digital data recording part, and thereafter, the reproduced security data is similarly reproduced. The result was compared with the security data of the digital data recording section, and good results were obtained in all cases.

<Example 5> Using the magnetic information recording medium according to the present invention, authenticity determination was performed. An example of the authenticity determination is shown in FIGS. 6 and 7. FIG. 6 is a diagram showing a state when it is determined to be true, and FIG. 7 is a diagram showing a state when it is determined to be false.

In this authenticity judging method, as shown in FIGS. 6 and 7, first, the read waveform at the time of registration and the read waveform at the time of transaction (analog information) are respectively converted into 8-byte digital data by normal A / D conversion. To process. Then, the correlation of the obtained digital information is compared and calculated. If the numerical value of the correlation coefficient is high as shown in FIG. 6, it is determined to be genuine, and if the numerical value of the correlation coefficient is low as shown in FIG. 7, it is determined to be false.

[0052]

Industrial Applicability The magnetic information recording medium of the present invention differs from the conventional method of dispersing long magnetic fibers or printing a pattern by intentionally providing minute magnetic unevenness as follows. Be advantageous

First of all, it is possible to cope with small-scale production, which is advantageous in terms of cost. Secondly, since the pattern is formed by unevenness of the non-magnetic material (= unevenness of magnetism), it is difficult to detect magnetic random data and security is high. Thirdly, the randomness is high as compared with the method of printing a magnetic pattern. Fourthly, compared to the conventional method of dispersing magnetic fibers, since magnetic ink is basically used, there are many binder components,
Processing such as cutting and punching is easy. Fifth, it can be read by a relatively simple device and its reading accuracy is high.

As described above, the magnetic information recording medium of the present invention can easily provide the ID data by the magnetic material peculiar to the medium, and the advantages described above can be obtained.

Further, it can be manufactured at low cost and has high security as a paper information recording medium used for tickets, commuter tickets, entrance tickets, various securities and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of a magnetic information recording medium of the present invention.

FIG. 2 is a sectional view of a magnetic information recording medium of another embodiment.

FIG. 3 is a sectional view of a magnetic information recording medium of another example.

FIG. 4 is a sectional view of a magnetic information recording medium of another example.

5A and 5B are diagrams illustrating an example in which the magnetic recording unit of the magnetic information recording medium in FIG. 1 is tampered with and an example in which the magnetic recording unit in the magnetic information recording medium in FIG. 1 is dead copied to another base material.

FIG. 6 is a diagram showing a state in the case of being determined to be true in the authenticity determination according to the present invention.

FIG. 7 is a diagram showing a state in the case of being determined to be true in the authenticity determination according to the present invention.

FIG. 8 is a schematic diagram showing a cross section of an example of a conventional information recording medium.

FIG. 9 is a schematic diagram showing a cross section of an example of a conventional information recording medium.

[Explanation of Codes] 1, 11, 21, 31 Magnetic Information Recording Medium 2, 42 Base Material 3 Sealing Layer 4 Magnetic Data Part 5 Concealing Layer 6 Digital Information Recording Part 7 Picture Print Layer 43 Magnetic Metal Fiber 44 Made of Magnetic Ink pattern

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mie Arai 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (8)

[Claims] 1. A magnetic field representing magnetic unique information formed on at least one surface of a substrate made of paper by a filling layer, magnetic particles and non-magnetic particles having an average particle size larger than the magnetic particles. A magnetic information recording medium characterized in that a data section is sequentially provided. 2. A magnetic material which represents magnetic unique information formed on at least one surface of a substrate made of paper by a sealing layer, magnetic particles and non-magnetic particles having an average particle size larger than the magnetic particles. A magnetic information recording medium, wherein data portions are sequentially provided, and digital information representing the magnetic unique information information is added to at least a part of the outermost layer of the base material. 3. The magnetic recording unit is provided on at least a part of the outermost layer of the base, and the digital information representing the magnetic unique information is recorded in the magnetic recording unit. Magnetic recording medium. 4. The magnetic particles have an average particle diameter of 10 μm or less, and the non-magnetic particles have a particle diameter of 2 μm or more.
A magnetic information recording medium according to the item. 5. The magnetic information recording medium according to claim 1, wherein the magnetic particles have a coercive force of 60 Oe or less. 6. The magnetic information recording according to claim 1, wherein a magnetic recording layer made of a magnetic material having a coercive force of 200 Oe or more is provided on the magnetic data portion. Medium. 7. The magnetic information recording medium according to claim 1, wherein a concealing layer is provided on the magnetic data section. 8. The magnetic information recording medium according to claim 3, wherein the magnetic recording layer also serves as a magnetic data section.