JP2567787B2 - Method of manufacturing magnetic recording medium - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manufacturing method in which judgment information that cannot be added or erased later on a magnetic recording medium is inserted at the time of applying a magnetic paint, and particularly has high productivity and is excellent in forgery prevention. And a method for manufacturing a magnetic recording medium.

[0002]

2. Description of the Related Art Magnetic recording media having a magnetic recording layer formed on a non-magnetic substrate are widely used as prepaid cards, boarding tickets, coupon tickets, identification cards, cash cards, credit cards, point cards and the like. In recent years, how to prevent unauthorized use such as forgery and alteration in these magnetic recording media has become a big problem. Therefore, various countermeasures against illegal use are used. Among them, the simplest one is a method by software for encrypting magnetic recording information, but the effect of preventing illegal use is not so high. Therefore, a method has been proposed in which the magnetic card itself has a function of preventing unauthorized use, which has a higher effect of preventing unauthorized use. These are roughly classified into two types. That is, the first method is a method of hiding the recorded magnetic information to make it unreadable, thereby making it difficult to falsify or copy the magnetic information, and the second method is to judge whether or not the magnetic card is a legitimate one. This is a method of preventing forgery by putting identification information for doing so in the card itself. For example, a known method for preventing unauthorized use of the first method is to make the magnetic recording section multi-layered so that the legitimate information is shielded so that it cannot be read, or dummy information is superposed on the legitimate information. There are some things that make the analysis of. In addition, as a measure for preventing unauthorized use of the second method, there is one provided with an optical bar code or a magnetic bar code.

However, each of these methods has drawbacks and is not yet sufficient. That is, the method for preventing unauthorized use of the first method has drawbacks such as a complicated manufacturing process and a complicated recording and reading apparatus. Also, once the details of the concealment method are known, it is possible to read out and analyze the information if it is familiar to the magnetic recording, and thus the duplication becomes possible. A card provided with the illegal use prevention measure of the second method cannot be actually used even if the magnetic information can be forged unless it is a legitimate card having correct judgment information. However, since the judgment information pattern can contain only one kind or a limited kind, there are many cards that contain the same kind of judgment information and a large number of cards can be rewritten by rewriting the information on those regular cards. It becomes possible to forge.
Further, this method has a drawback that the manufacturing process becomes complicated and the determination information reading device becomes complicated.

[0004]

SUMMARY OF THE INVENTION The present invention is a method for manufacturing a magnetic recording medium having an illegal use preventing function according to the second method, and it is almost impossible to illegally use the method overcoming the drawbacks of the conventional methods. A method of manufacturing a magnetic recording medium is provided.

[0005]

The present invention relates to a manufacturing method for inexpensively providing a magnetic recording medium which is extremely difficult to be illegally used. The present invention is to form a magnetic layer by coating a magnetic coating on a substrate made of a non-magnetic material, and before the magnetic layer is dried,
By heating from the anti-coated surface of the substrate, the magnetic layer is partially dried to form a non-oriented portion, then most of the magnetic layer is oriented in a predetermined direction by the magnetic field orientation magnet, and then the coated surface is dried. And a magnetic recording medium manufacturing method.

[0006] Examples of the heating means constituting the non-oriented portion include a metallic heat roll and a hot plate. A convex portion is formed on the surface of the heat roll in a pattern of bar codes, characters, figures, etc., and the heat roll or heat plate is pressed against the anti-coated surface to partially dry and form a non-oriented portion. can do. In addition, a heater is incorporated in the hot roll so that it can be heated to a constant temperature.

The present invention will be described in detail below with reference to the drawings. FIG.
FIG. 3 is an explanatory diagram of an example of a method for manufacturing the magnetic recording medium of the present invention. A sheet-shaped substrate S-1 made of a non-magnetic material is sent out from a sending roll 11, guided to a magnetic paint coating device 12 having a coating head 13, and coated to form a magnetic layer. A coated body S in which a magnetic coating is coated on the substrate S-1
-2 is wound around a winding reel 18 through a roll 14, a magnetic field orientation device 15, a drying part 16, and a roll 17.
In this case, before being oriented by the magnetic field orientation device 15, heating is performed in a pattern from the anti-coated surface with a heat roll 19 heated to 120 ° C. to dry a specific portion of the coated body S-2 into a bar code, After that, the coated surface is magnetically oriented by the magnetic field orientation device 15, passed through the drying part 16 and the roll 17, and wound on the winding reel 18 to obtain a magnetic recording medium. FIG. 2 shows an example of the heat roll of the heat roll 19 shown in FIG. The pattern convex portion 4 is provided on the surface of the thermo roll 19. Next, the material of the magnetic recording medium provided by the manufacturing method of the present invention will be described. First, as the substrate made of a non-magnetic material, a polyester film having a thickness of 150 μm to 1 mm,
Sheet-shaped non-magnetic materials such as vinyl chloride film, synthetic paper, wood pulp paper, and laminated paper can be applied. As the magnetic material used for the magnetic layer, γ-iron oxide, cobalt-doped γ
-Iron oxide, chromium oxide, barium ferrite, strontium ferrite, etc. are applied, and these magnetic materials are used as vinyl chloride / vinyl acetate copolymer, vinyl chloride / vinyl acetate / vinyl alcohol copolymer, polyurethane resin, polyester resin, epoxy. The magnetic layer can be formed by applying a coating material in which a binder such as a resin and an additive such as a pigment are dispersed on a substrate.

If necessary, the following coating layer may be provided on the magnetic layer. That is, (a) a colored layer containing an aluminum powder for hiding the coloring of the magnetic layer, a white pigment, etc., (b) a discharge recording comprising a leuco dye type thermal recording layer, a metal vapor deposition layer of tin, aluminum or the like. It is possible to form one or a plurality of layers of the print recording layer (1) and the protective layer (c) made of a thermosetting resin, a thermoplastic resin, or an ultraviolet curable resin in sequence. In addition, it is also possible to stack printing layers such as characters and figures and color printing layers. FIG. 3 is a front view showing an example of the magnetic recording medium obtained by the present invention. A magnetic layer is provided on a substrate 1 made of a non-magnetic material, most of which has a magnetic field orientation 2 in the longitudinal direction of the card, and a bar code pattern-shaped non-oriented portion 3 is provided at a predetermined position on the heat roll. The pattern convex portion 4 of FIG. FIG. 4 is a front view showing another example of the magnetic recording medium obtained by the present invention, in which a magnetic layer is provided on a substrate 1 made of a non-magnetic material, and the magnetic layer is formed at 45 ° or 135 ° with respect to the longitudinal direction of the card. The magnetic field orientation is 2 and
Further, a bar code pattern-shaped non-oriented portion 3 is provided at a predetermined position by a pattern convex portion 4 of the heat roll. The magnetic recording medium obtained by the method of the present invention has the structure as described above, and when magnetic recording is performed in the orientation direction, the reproduction output is, for example, a normal output in the oriented portion. However, a lower output is obtained in the partially provided non-oriented portion. That is, the presence or absence and the width of the non-oriented portion can be detected by this output difference, and if this is used as the forgery prevention information, it can be an extremely effective forgery prevention means. Further, magnetic bar codes and the like cannot give different information to each card, but the present invention can give different information to each card.

[0009]

EXAMPLES The present invention will be described in detail below with reference to examples. still,
All compounding parts are parts by weight. Example 1 A coating material for the magnetic layer was prepared with the following composition.・ Barium ferrite BaO ・ 6 Fe ₂ O ₃ (coercive force 2750 Oersted, specific surface area 8 m ² / g) 100 parts ・ Carbon black 3 parts ・ Lecithin 1 part ・ Vinyl chloride / vinyl acetate / vinyl alcohol copolymer 20 parts ・ Polyurethane Resin 20 parts-Toluene 60 parts-Methyl ethyl ketone 60 parts-Methyl isobutyl ketone 60 parts After dispersing the above mixture in a ball mill for 8 hours, 5 parts of polyisocyanate resin was added and further dispersed for 1 hour to obtain a magnetic coating for a magnetic layer. It was Using this magnetic paint,
It was applied by the method shown in. FIG. 5 shows the heat roller 1 in FIG.
9 is a plan view of the vicinity of the magnetic field orientation device 15. In the present embodiment, the magnetic field orientation device 2 uses a magnetic field orientation device of 5 KOe such that the magnetic field orientation 2 is 0 °, that is, the angle α = 0 °. I was there. It should be noted that the heating was performed by applying a heat roll heated to 120 ° C. having convex portions formed in a bar code pattern to the anti-coated surface,
The non-oriented portion 3 was formed, and after the magnetic field orientation, the coated surface was dried. From the magnetic recording medium thus obtained, a JIS size magnetic card is punched out so that a non-oriented portion is inserted, and a 210
When all-F (hexadecimal) FM recording was performed by FCI and reading was performed, an output pattern as shown in FIG. 6 was obtained. Output a of non-oriented part is about 40% of output b of oriented part
It became low. The card could be identified sufficiently stably by detecting the number of low output parts and the position from the card edge.

Example 2 The same composition material for magnetic coating material as in Example 1 was dispersed in a ball mill for 8 hours, and then 5 parts of polyisocyanate resin was added,
The dispersion was further performed for 1 hour to obtain a magnetic coating material for the magnetic layer. This coating material was applied by the method shown in FIG. FIG. 7 is a plan view of the vicinity of the heat roll 19 and the magnetic field orientation device 15 in FIG. 1. In this embodiment, the magnetic field orientation 2 is 45 ° with respect to the application direction of the application body, that is, the angle α = 45 °. A magnetic field orientation device of 5 KOe was used. In addition, heating was performed by applying a heat roll heated to 120 ° C. having convex portions formed in a bar code pattern to the non-coated surface to form the non-oriented portion 3, and after the magnetic field orientation, the coated surface was dried. From the magnetic recording medium obtained in this manner, the JIS should be set so that the non-oriented portion may enter.
Use a magnetic reader / writer for the card to punch out a magnetic card of a size, and use a magnetic head tilted in the direction of orientation, that is, 45 °, with an F of 210 FCI (hexadecimal).
When M recording was performed and reading was performed, an output pattern as shown in FIG. 8 was obtained. The output c of the non-oriented portion was about 20% lower than the output d of the oriented portion. The card could be identified sufficiently stably by detecting the number of low output parts and the position from the card edge.

[0011]

As described above, the magnetic card obtained by the manufacturing method of the present invention is provided with the magnetic field oriented portion and the non-oriented portion obtained by heating and drying from the anti-coated surface before the magnetic field orientation. The identification information can be easily obtained by detecting the output difference of that portion, and the manufacturing method is extremely simple, but has a special effect that it is difficult to counterfeit. When the magnetic recording medium obtained by the manufacturing method of the present invention is formed into a card, different forgery prevention data can be put in each card, and therefore forgery is extremely difficult. This data cannot be added or deleted later.

[Brief description of drawings]

FIG. 1 is a schematic view showing a method for manufacturing a magnetic recording medium of the present invention.

FIG. 2 is a view showing a heat roll used in the present invention.

FIG. 3 is a diagram showing an example of a magnetic recording medium in which the main orientation direction of the magnetic material is 0 °.

FIG. 4 is a diagram showing an example of a magnetic recording medium in which the main orientation direction of the magnetic material is 45 °.

FIG. 5 is a view showing a state in which a magnetic material is magnetically oriented at 0 ° with respect to a traveling direction of a raw material.

6 is a state waveform diagram in which an output when magnetic recording is performed on a track including a non-oriented portion of the magnetic recording medium obtained by the manufacturing method of FIG. 5 and the recording is read is displayed on a synchroscope.

FIG. 7 is a diagram showing a state in which a magnetic material is magnetically oriented at 45 ° with respect to a traveling direction of a material.

FIG. 8 is a state waveform diagram in which the output when the magnetic recording is performed on the track including the non-oriented portion of the magnetic recording medium obtained by the manufacturing method of FIG. 7 and the recording is read out is displayed on the synchroscope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base | substrate consisting of a non-magnetic substance 2 Magnetic field orientation 3 Non-orientation part 4 Pattern convex part S-1 Substrate S-2 Coating body 11 Sending roll 12 Coating device 13 Coating head 14 Roll 15 Magnetic field aligning device 16 Drying part 17 Roll 18 Take-up reel 19 Heat roll

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Claims (1)

(57) [Claims] 1. A magnetic coating is applied on a substrate made of a non-magnetic material to form a magnetic layer, and the magnetic layer is partially heated by heating from the anti-coated surface of the substrate before the magnetic layer is dried. A method for producing a magnetic recording medium, which comprises drying to form a non-oriented portion, followed by orienting most of the magnetic layer in a predetermined direction by a magnetic field orientation magnet, and then drying the coated surface.