JP2706715C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shopping card, a savings card, a commuter pass, a train ticket, a coupon, a pre-paid card, a cash card, a credit card, an identification card, and a consultation ticket. The present invention relates to a magnetic recording medium used for a magnetic card, a magnetic sheet, a magnetic roll paper, and the like, and a method for manufacturing the same. 2. Description of the Related Art Recently, magnetic recording media such as magnetic recording cards or magnetic roll paper have been increasingly used in various fields. The basic structure is such that a layer of a magnetic material is provided on a substrate made of a non-magnetic material, and this is magnetized. Such magnetic recording media need to prevent unauthorized use due to duplication or falsification of magnetic information, and therefore various measures for preventing unauthorized use have been taken. Typical measures for preventing unauthorized use are roughly classified into a method for making recording and reproduction of magnetic recording information difficult, and a method for providing the magnetic recording medium itself with true / false judgment information. The former is a method of concealing recorded magnetic information and making it difficult to falsify or duplicate magnetic information by making it difficult to write and read information, and the latter is to determine whether a magnetic card is genuine. This is a method of preventing forgery and falsification by putting the identification information of the card in the card itself. [0003] In more detail, the former known measure for preventing unauthorized use by making recording and reproduction of magnetic recording information difficult is to use a magnetic recording layer. There are some layers that hide legitimate information and make it impossible to read, or superimpose dummy information to make it difficult to analyze legitimate information.However, legitimate information and dummy information are recorded on the same track. Then, at the time of reading, since the dummy information is superimposed on the regular information,
Regular information cannot be read by a normal method. However, it has drawbacks such as the complexity of the recording / reading device, and once the details of the method of reading regular information are known, anyone familiar with magnetic recording should read and analyze the information. Therefore, there is a problem that a large amount of magnetic recording media can be copied. On the other hand, in the latter magnetic card itself, which is provided with authenticity determination information, for example, a magnetic recording medium is provided with a barcode that can be read magnetically, and the authenticity of the information is determined based on the barcode information. Since the medium itself has information to determine whether the magnetic recording medium is genuine, it is difficult to duplicate the medium in large quantities and use it improperly. Can not deal with. [0004] The magnetic recording medium according to the present invention is provided with the latter function of preventing unauthorized use. However, unlike conventional magnetic recording media, different fingerprint information is used for each medium. Since the layer is provided, unauthorized use is impossible, and at the same time, a layer formed for providing a function for preventing a fraud can also be used as a print recording layer. The outline of the present invention is as follows. The magnetic recording medium according to the present invention comprises a magnetic recording layer made of a magnetic material having a coercive force of 200 to 5000 Oe on a base made of a non-magnetic material,
With the magnetic flux reversal interface formed in the layer, from evaporation, sputtering, plating
A magnetic thin film layer having a coercive force of 1000 Oe or less formed by at least one selected method is sequentially laminated, and the magnetic thin film layer has a pattern-like shape which is thicker than other portions which cannot be added or erased later. a magnetic recording medium fixed information that has been formed. That, when the invention of claim 1 for producing a magnetic recording medium, after forming the magnetic recording layer of the magnetic coating material on a substrate made of a nonmagnetic material consisting of 200 Oe to 5000 Oe in coercive force by coating and drying, the magnetic flux with magnetic recording to form the inverted interface unit, after accordingly, vapor deposition magnetic recording layer, a sputtering method, by forming a magnetic thin film layer by both one way less selected from plating, later
The fixed information in the form of a pattern that is thicker than other parts that cannot be added or erased
A method for manufacturing a magnetic recording medium , comprising forming a thin film layer . The magnetic recording medium printed on the magnetic thin film layer of the magnetic recording medium by a discharge breakdown method.
Can be used. [0006] The method of manufacturing a magnetic recording medium according to claim 1, first a magnetic recording layer formed on the nonmagnetic performs magnetic recording, followed by forming a magnetic thin film layer formed thereon. The magnetic metal, magnetic alloy or magnetic compound forming the magnetic thin film layer is provided at the magnetic flux reversal interface of the magnetic recording layer,
It deposits thicker than other parts and forms a pattern. This pattern portion has the same function as a magnetic barcode made of a magnetic metal, a magnetic alloy or a magnetic compound, and can be magnetically detected by a magnetic head or the like. That is, this pattern becomes fixed information that cannot be added or deleted later, and can be used as unauthorized use prevention information of the medium. In the present invention, the content of the fixed information formed on the non-magnetic thin film is determined by the magnetic recording information performed on the magnetic recording layer. That is, by controlling the magnetic recording information, it becomes possible to add different fixed information to the magnetic recording medium as a final product, for example, for each magnetic card. Conventionally, such fixed information has been formed by a printing method, so that only the same information or limited types of information can be given to individual magnetic recording media. On the other hand, according to the method of the present invention, the recording density of fixed information can be dramatically increased, and more complicated information can be added. It is preferable that the magnetic information formed in a pattern is difficult to be visually confirmed due to its use as unauthorized use prevention information. In the method of the present invention, it is possible to obtain a sufficient magnetic output even if the fixed information formed in a pattern is extremely thin, and the physical protrusion (thickness) of the pattern portion may be small. It is difficult to visually confirm and concealment is easy. Further, in the method of the present invention, since the layer is formed on the magnetic recording layer or the magnetic thin film layer, and is extremely thin, it has almost no adverse effect on normal magnetic recording performed on portions other than the fixed information section. There is a feature that there is no. In addition to the function of having the fixed information for preventing forgery formed, the magnetic thin film layer also has the function of a print recording layer by a discharge printing method, so that the magnetic thin film layer has a function such as a balance display. It is possible to perform print recording that requires visual observation. Hereinafter, the present invention will be described with reference to the drawings. FIG. 1A is a plan view of a magnetic recording medium (card) obtained by the present invention, and has a magnetic track T. FIG. FIG. 1B is a cross-sectional view taken along the line XX 'of the track T. A magnetic recording layer 2 made of a magnetic material having a coercive force of 200 to 5000 Oe and an adhesion auxiliary layer 3 are formed on a substrate 1 made of a nonmagnetic layer. , 1000 Oe or less, and a protective layer 5 provided as needed. A portion T in FIG. 1A is a track of magnetic recording performed on the magnetic recording layer. P
Corresponds to the magnetic flux reversal interface of the magnetic recording performed on the magnetic recording layer, and the magnetic thin film layer formed on the magnetic recording layer is thickly deposited on this portion to form fixed information in a pattern. The protective layer 5 may be further printed with graphic characters and the like and a protective film. Next, the materials constituting the magnetic recording medium obtained by the present invention will be described. First, as a substrate made of a nonmagnetic material, a polyester film having a thickness of 150 μm to 1 mm,
Sheet-shaped non-magnetic materials such as ceramics such as vinyl chloride film, synthetic paper, wood pulp paper, laminated paper, metal sheets, and glass can be used. The magnetic material used for the magnetic recording layer laminated adjacent to the base is not particularly limited, or generally a ferromagnetic material having a coercive force of 200 to 5000 Oe, for example, γ-iron oxide, cobalt-doped γ -Fine powders such as iron oxide, chromium oxide, barium ferrite and strontium ferrite are applied. These magnetic materials are used as binders for vinyl chloride / vinyl acetate copolymers, vinyl chloride / vinyl acetate / vinyl alcohol copolymers, polyurethane resins, polyester resins, epoxy resins, polyisocyanate resins, etc. A magnetic recording layer can be formed by dispersing together with the coating liquid or ink to form a coating liquid or ink and applying or printing the coating liquid or ink on a substrate.
At this time, the magnetic recording layer 2 may be subjected to a magnetic field orientation treatment before the magnetic paint or ink is dried. The magnetic thin film layer 4 is provided for forming fixed information and performing a function of preventing forgery, and performing a function of a print recording layer by a discharge printing method. The material for forming the magnetic thin film layer is required to have a coercive force of 1000 Oe or less. For example, magnetic metals such as Ni, Co, and Fe, sendust alloys that are Fe-Al-Si alloys, and Fe-Al alloys Alloy, Fe-Si alloy, Fe-Ni permalloy, Ni-Fe
Alloys such as -Mo supermalloy, amorphous metals of transition metals and transition metals-metalloids, magnetic metal compounds such as gamma iron oxide and barium ferrite, and soft magnetic ferrites such as Zn ferrite and Mn-Zn ferrite are applied to the present invention. You. These materials are used to form a magnetic thin film layer using a vapor deposition method, a sputtering method or a plating method. When the coercive force is 1000 Oe or more, it is difficult to concentrate the material constituting the magnetic thin film layer on the magnetic flux reversal interface of the magnetic recording performed on the magnetic recording layer, and it is difficult to form fixed information. . The magnetic recording medium obtained by the present invention preferably has an adhesion auxiliary layer 3 provided between the magnetic recording layer 2 and the magnetic thin film layer 4. The adhesion auxiliary layer 3 is provided between the magnetic recording layer and the magnetic thin film layer to improve the adhesive strength between the two, and also functions to promote the destruction of the magnetic thin film layer 4 during discharge recording and to improve print recording characteristics. have. Examples of the material include acrylic resins such as polystyrene and polymethyl methacrylate (PMMA), cellulose resins such as cellulose acetate propionate (CAP), vinyl chloride-vinyl acetate copolymer resins, polyester resins, epoxy resins, and urethane resins. And the like. Further, in order to control the thermoplasticity of the thermoplastic resin, additives such as a plasticizer, a wax, and an inorganic pigment may be added to the adhesion auxiliary layer. When the magnetic thin film layer is not used as the discharge print recording layer, a thermosetting resin, for example, a polyester resin, a polyisocyanate-based curing agent, and a two-liquid mixed type resin may be used for the adhesion auxiliary layer. Further, a photocurable resin or an electron beam curable resin made of an acrylic oligomer can be used. When the adhesion between the magnetic recording layer and the magnetic thin film layer is sufficient, it is not necessary to provide an adhesion auxiliary layer. Further, as the protective layer 5 provided as needed, a resin such as a cellulose-based, polyester-based, urethane-based, epoxy-based, or acrylic-based resin can be used. These resins may be used alone or as a mixture of two or more, or may be used in combination with a curing agent such as an isonate-based curing agent. Further, an ultraviolet curable resin or an electron beam curable resin made of an acrylic, polyester, epoxy, phosphazene or the like resin may be used. Waxes, inorganic pigments, or silicon-based or fluorine-based compounds may be added to these resin systems alone or in combination to enhance discharge recording characteristics. The manufacturing method of the present invention will be described in further detail. For example, as shown in FIG. 2, the base 1 made of a non-magnetic material is sent out from a sending-out reel 11 and guided to a coating device 12 for coating a magnetic recording layer paint. Apply. The substrate 1 applied by the coating head 13 is wound on a take-up reel 18 via a magnetic field orientation device 15, a drying part 16, and a roll 17 via a roll 14. The roll wound up is a raw material coated with only the magnetic recording layer. Next, an adhesion auxiliary layer is applied to the surface of the magnetic recording layer. The application method is the same as that for the magnetic recording layer described above. At this time, a recording magnetic head is mounted at the position 19 of the coating apparatus, and magnetic recording is performed on the magnetic recording layer. Recording may be performed in the same manner as recording on a magnetic recording medium using a normal magnetic recording device. When the adhesion between the magnetic recording layer and the magnetic thin film layer is sufficient, it is not necessary to provide an adhesion auxiliary layer. In this case, magnetic recording may be performed using a magnetic recording device as shown in FIG. In any case, the situation of the magnetic recording will be described with reference to FIGS.
That is, the magnetic material 22 having the magnetic recording layer 2 is sent out from the magnetic material roll 23, and the magnetic head 2 composed of electromagnets connected to a plurality of drive circuits (not shown).
The magnetic information which is magnetized by 1 and becomes a source of the forgery prevention fixed information is recorded. Reference numeral 25 denotes a magnetic recording track, and the magnetic source 22 is wound around a magnetic-recorded source roll 24. The same reference numerals in each drawing indicate the same parts. In the magnetic recording track 25, a magnetic flux reversal interface 31 is formed in the magnetic recording section 26 as shown in the sectional view 5. Subsequently, a magnetic thin film layer is formed on the magnetic recording layer on which the magnetic recording has been performed, with or without an adhesion auxiliary layer. The magnetic thin film layer is formed by a method such as an evaporation method, a sputtering method, and a plating method. Then, the material constituting the magnetic thin film layer is deposited thickly on the magnetic flux reversal interface 31 as shown in FIG. 6, and the fixed information pattern 32 is formed. [0015] In the above method, the magnetic substance to be blended in the magnetic recording layer is from 200 Oersted to 200 Oersted.
Since the coercive force is almost the same as that of a normal 5000 Oersted magnetic recording medium, magnetic recording can be easily performed with a magnetic recording head after the formation of the magnetic recording layer. In this case, if the magnetic material is less than 250 Oersted, there is a problem that the magnetic material is erased by an external magnetic field for magnetic recording. On the other hand, if the magnetic material is larger than 5000 Oersted, magnetic recording of a magnetic head currently in practical use becomes impossible. When forming the magnetic thin film layer 4, first, magnetic recording is performed on the magnetic recording layer formed first. Recording may be performed at a predetermined recording density using a recording magnetic head as in the case of ordinary magnetic recording. As an example, magnetic recording is performed as follows. Using a digital FM recording method, a pulse current capable of sufficiently saturation recording on a magnetic recording layer is applied to a recording magnetic head. As the recording information, it is sufficient to record information desired to be stored in each recording medium (for example, one magnetic card) as a final product. That is, different recording mediums, such as different numbers or random fingerprint information, may be recorded, or unified information such as recognition information for each manufacturing lot and a manufacturer code. These may be combined. As described above, the magnetic thin film layer 4 is formed by using a sputtering method, a vapor deposition method, or a plating method. The material constituting the magnetic thin film layer is concentrated on the magnetic recording pattern previously applied to the magnetic recording layer and concentrated on the strong magnetic field at the interface of the magnetic field reversal part, and a pattern corresponding to the magnetic recording pattern is formed on the magnetic thin film layer Is fixed. The pattern formed on the magnetic thin film layer is magnetically readable even after erasing the magnetic recording information provided on the magnetic recording layer. For example, if reading is performed with a magnetic head while applying a DC bias magnetic field, an output corresponding to the pattern can be obtained.
If the coercive force of the magnetic thin film layer is 20 Oe or less, even after reading the fixed information with a magnetic head while applying a bias magnetic field, the pattern portion is not magnetized, and observation with a magnetic viewer or the like is performed. Since it is not possible to confirm the existence of the pattern, it is more preferable to use for preventing unauthorized use. The fixed information in a pattern formed on the magnetic thin film layer is formed corresponding to the magnetically recorded information on the magnetic recording layer. Therefore, when changing the fixed information, it is sufficient to change the magnetic recording information performed on the magnetic recording layer in the manufacturing process, and the change can be easily made. When fixed information such as a magnetic barcode is formed using a printing method or the like, a new plate must be created each time the fixed information is changed, but this method is not necessary in this method. Hereinafter, the present invention will be described in detail with reference to examples. In addition, the number of parts represented by the material composition is all parts by weight. After the mixture prepared with the following composition was dispersed in a ball mill for 8 hours, 5 parts of a polyisocyanate curing agent was added, and the mixture was further dispersed for 1 hour to obtain a coating material for a magnetic recording layer. The coating material was applied to one surface of a base made of a white polyester film having a thickness of 188 μm using a reverse roll coater so that the coating thickness after drying was 12 μm to form a magnetic recording layer. At this time, the magnetic recording layer was subjected to a magnetic field alignment treatment using a magnetic field alignment apparatus before drying. Barium ferrite (coercive force 2750 Oersted, specific surface area 7 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 The magnetic recording layer thus obtained was subjected to magnetic recording using a magnetic head. A magnetic head having a head gap of 50 μm was used, and recording was performed with a recording current capable of sufficiently recording a magnetic recording layer. The recording method used was the FM method, and the recording density was 250 bpi. Then, a coating for an adhesion auxiliary layer prepared with the following composition was applied to the surface of the magnetic recording layer by a reverse roll coater so that the coating thickness after drying was 2 μm. Aqueous polyolefin resin 100 parts Fine powder silica 5 parts Trimethylolpropane / tri-β-aridinylpropionate 1 part Isopropyl alcohol 15 parts Water 25 parts Subsequently, Ni is vapor-deposited on the surface of the adhesion auxiliary layer by a vacuum vapor deposition method. A magnetic thin film layer was formed. The film thickness was adjusted to be 600 ° as measured by a quartz oscillator. Further, a coating material for a protective layer prepared with the following composition was applied on the obtained magnetic thin film layer with a reverse roll coater to obtain a target material for a magnetic recording medium. Aqueous polyolefin resin 5 parts Fine powder silica 1 part Isopropyl alcohol 3 parts Water 20 parts The pattern to be fixed information is to form a metal thin film layer (in this case, a metal deposition layer) after performing magnetic recording on the magnetic recording layer Then, the material (in this case, Ni) constituting the metal thin film layer is formed by being concentrated on the magnetic flux reversal interface of magnetic recording. A JIS size magnetic card was punched out of the magnetic recording medium raw material thus obtained, and the following evaluation was performed. That is, DC demagnetization was performed on the portion of the magnetic thin film layer where the fixed information was formed, under the condition that the magnetic recording performed on the magnetic recording layer could be sufficiently erased. Thereafter, the fixed information was read out using a reproducing magnetic head while applying a bias magnetic field of 500 Gauss. As a result, the information corresponding to the fixed information pattern could be read. This information was not erased even after DC demagnetization was performed, and was fixed to the magnetic thin film layer as information independent of the magnetic recording layer. This information can be used as ID information of the magnetic card to prevent unauthorized use. Also, when a magnetic recording / reproducing apparatus for a card having a coercive force up to 3000 Oersted repeatedly performed normal magnetic recording, reproduction and erasing on a portion of the card where fixed information was not formed, no problem was found. Could be used. Further, when a character pattern such as a number and a kanji is printed on a portion of the card where fixed information is not formed by using a discharge recording device, it can be printed and recorded in the same manner as a normal discharge recording card. did it. As described above, in the method for manufacturing a magnetic recording medium according to the present invention, the fixed information for preventing unauthorized use that can be detected magnetically and that corresponds to the information recorded on the magnetic recording layer is a magnetic thin film. Formed in layers. Further, the unauthorized use information can be ID information (fingerprint information) that differs depending on each magnetic recording medium product. Further , according to the method of manufacturing a magnetic recording medium of the present invention, there is an unprecedented operational effect that it is possible to print and record by a discharge recording method on the magnetic thin film layer on which the fixed information is formed. Further, the method of manufacturing a magnetic recording medium of the present invention is an application of the method used in the conventional method of manufacturing a magnetic recording medium and the magnetic recording itself, and does not require a special device. There is an operational effect that a possible magnetic recording medium can be easily manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a plan view of a magnetic recording medium obtained by the present invention, and FIG. 1B is a magnetic recording medium obtained by magnetizing the magnetic recording medium taken along the line XX ′ in FIG. FIG. 2 is a process diagram of a stage of providing a magnetic recording layer. FIG. 3 is a schematic diagram of a magnetic recording device. FIG. 4 is a plan view showing a state of magnetic recording. FIG. FIG. 6 is a diagram showing a state in which fixed information is formed with a magnetic thin film layer. Explanation of reference numeral T track P magnetic flux reversal interface 1 base made of nonmagnetic material 2 magnetic recording layer 3 adhesion auxiliary layer 4 magnetic thin film layer 5 protection Layer 11 Send-out reel 12 Paint coating device 13 Coating head 14 Roll 15 Magnetic orientation device 16 Drying part 17 Roll 18 Take-up reel 21 Magnetic head 22 Magnetic fabric 23 Magnetic fabric roll 24 Magnetically recorded magnetic thick roll 25 Magnetic Recording tiger 26 Magnetic recording unit 31 Flux reversal interface 32 Fixed information pattern

Claims (1)

After forming the magnetic recording layer by the Patent Claims 1. A magnetic coating composition consisting of 200 Oe to 5000 Oe on a substrate made of a nonmagnetic material coercivity coating and drying, magnetic
Magnetic recording is performed to form a bundle reversal interface, and thereafter, a magnetic thin film layer is formed on the magnetic recording layer by at least one method selected from a vapor deposition method, a sputtering method, and a plating method. Thicker than other parts that cannot be added or erased
A method for manufacturing a magnetic recording medium, comprising forming fixed information in a pattern on the magnetic thin film layer.