JP3256580B2 - Magnetic recording medium and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic recording medium and a method of manufacturing the same, and more particularly, to a magnetic recording medium having a permanent magnetic pattern formed thereon and a method of manufacturing the same.

[0002]

2. Description of the Related Art In a magnetic recording medium such as a magnetic card,
There is known a magnetic card or the like in which a permanent magnetic pattern is formed for identification. Conventionally, as a method of forming such a permanent magnetic recording pattern, a method of forming a magnetic pattern by printing such as a MICR character or a magnetic bar code, an opening of a punched hole in a magnetic layer, a laser of a magnetic layer, a needle, etc. There has been a method of forming a magnetic pattern by destruction by a magnetic field.

[0003]

However, in the case of the former method, it is necessary to form a nonmagnetic dummy pattern in order to prevent the pattern from being visually identified, and this dummy pattern is formed of the same ink as the magnetic pattern. If not, there is a problem that the magnetic pattern can be easily determined.

[0004] In the latter case, there is a problem that the magnetic pattern can be easily identified because the pattern is formed by destruction of the magnetic layer.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic recording medium which solves the above-mentioned problems of the conventional magnetic pattern and makes it more difficult to visually distinguish it from a dummy pattern, and a method of manufacturing the same. .

[0006]

According to the present invention, a magnetic recording medium comprises a base material, a magnetic layer formed on the base material and magnetically oriented in a certain direction, and a magnetic layer formed on the magnetic layer by melting the magnetic layer. The magnetic layer has a magnetic orientation that is disturbed in a portion in contact with the print pattern and is magnetically oriented in a certain direction except for a portion in contact with the print pattern.

Further, according to the present invention, a method for manufacturing a magnetic recording medium having a permanent magnetic pattern formed thereon comprises applying a magnetic coating material containing magnetic powder to a base material, magnetically orienting the magnetic coating material in a predetermined direction, and then drying. Forming a magnetic layer by forming a predetermined print pattern with an ink containing a solvent that can dissolve the magnetic layer on the magnetic layer but cannot be dissolved after the magnetic layer is cured, and dissolve the magnetic layer corresponding to the print pattern. And a step of hardening the magnetic layer.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a magnetic recording medium according to the present invention.

One embodiment of the magnetic recording medium according to the present invention is shown in FIG. As shown in the drawing, the magnetic recording medium has a magnetic layer 14 formed on a base material 12 and a printed pattern 16 formed on the magnetic layer 14. The magnetic layer 14 is magnetically oriented in a certain direction except for the portion in contact with the print pattern 16, in this embodiment, in the longitudinal direction of the base material 12.
The portion of the magnetic layer 14 in contact with the print pattern 16 is dissolved by the solvent contained in the ink of the print pattern 16,
The direction of magnetization is random, and is not magnetically oriented in a certain direction.

On the magnetic layer 14, a dummy pattern 1 is formed.
8 are formed. The dummy pattern 18 is formed by the same ink as the print pattern 16 after the magnetic layer 14 is cured after the magnetic layer 14 is melted by the print pattern 16. On the printed pattern 16 and the dummy pattern 18, a concealing layer 20 and a protective layer 22 are laminated.

As described above, in the magnetic recording medium, the permanent magnetic pattern is formed on the magnetic layer 14 corresponding to the print pattern 16.

Next, a method for manufacturing such a magnetic recording medium will be described.

First, as shown in FIG. 2A, a magnetic layer 14 is formed by applying a magnetic paint containing a magnetic powder and a binder on a base material 12 such as a PET film. As shown, magnetic orientation is performed in a fixed direction A. As the magnetic paint, a two-pack type with a hardener added is usually used. When cured, the magnetic layer has solvent resistance that does not dissolve in the ink containing a high-boiling solvent described below.

Next, as shown in FIG. 2B, a desired pattern is printed using, for example, a silk screen type nonmagnetic ink containing a high boiling point solvent to form a print pattern 16. When the print pattern 16 is formed, the magnetic layer 14 is not yet cured. Printing pattern 1
After the printing of No. 6, as shown in FIG. 2C, the hatched portion of the magnetic layer 14 in contact with the printing pattern 16 is dissolved by the solvent contained in the ink of the printing pattern 16, and the orientation of the magnetic powder is disturbed. By drying this, the print pattern 16 is fixed.

Thereafter, the magnetic layer 14 is hardened by aging sufficiently. After curing, the magnetic layer 14 'is no longer dissolved by the solvent of the ink, so the dummy pattern 18 is printed using the same or another ink as shown in FIG. Depending on the printing of the dummy pattern 18, the magnetic layer 1
4 'does not dissolve.

Further, a magnetic recording medium is manufactured by providing a concealing layer 20 and a protective layer 22 as necessary.

According to such a magnetic recording medium, the portion of the magnetic layer 14 which is dissolved by the ink of the print pattern 16 is disturbed in orientation, and the other portions are magnetically oriented in a certain direction. Since these orientation patterns are not changed by subsequent printing or the like, they can be used as permanent magnetic patterns. When the magnetic recording medium as shown in FIG. 3 is magnetized by a predetermined magnetic field (rightward magnetization is plus), as shown in FIG. Is reduced. Therefore, a magnetic pattern can be identified by detecting the degree of such magnetization using magnetic detection means.

According to the magnetic recording medium manufactured by the above method, the print pattern 16 corresponding to the magnetic pattern
Since the dummy pattern 18 and the dummy pattern 18 are formed of the same ink, it is difficult to visually distinguish the magnetic pattern and the dummy pattern, and illegal use can be effectively prevented.

In the above embodiment, the orientation of the magnetic layer 14 is parallel to the surface of the substrate 12, but may be perpendicular to the surface of the substrate 12. Further, as the ink forming the print pattern 16, a magnetic ink having a coercive force different from that of the magnetic layer 14 may be used. Alternatively, instead of ink, a solvent capable of dissolving the uncured magnetic layer may be applied according to the magnetic pattern to be formed, and dried. If a magnetic pattern is formed using a solvent in this way, it becomes more difficult to visually identify the magnetic pattern as compared with the printed pattern.

Further, when the printing pattern 16 is formed using a magnetic ink having a coercive force different from that of the magnetic layer 14,
Complex magnetic data can be given by the pattern.

The case where the method of manufacturing a magnetic recording medium according to the present invention is applied to the manufacture of a magnetic card will be described in detail with reference to a more specific example.

First, as the substrate 12, for example, a thickness 188
μm white PET film, E-22 manufactured by Toray Industries, Inc.
E-24 or the like is prepared. As the substrate 12, a material used as a substrate in a normal card, for example, high-quality paper, plastic such as hard polyvinyl chloride, polyester, or the like can be used.

Next, a magnetic layer 14 is formed by coating a magnetic paint. For example, a magnetic ink having the following composition can be used. Magnetic powder manufactured by Toda Kogyo Co., Ltd. MC-127 100 parts Dispersant Toho Chemicals brand name Phosphanol RE-960 3 parts Binder Union Car Band VAGH 12.5 parts Nippon Polyurethane N-2304 35.7 parts (NV 35% MEK solution) Antistatic agent Product name VULCAN XC72 3 parts Solvent Cyclohexanone 67 parts Toluene 33 parts Methyl ethyl ketone 10 parts

The above composition is made into an ink beforehand, and the following curing agent is added immediately before coating. Curing agent N-3041, 8 parts, made by Nippon Polyurethanes (NV50%)

In this embodiment, the coating method is a reverse roll method, but other coating methods such as a gravure method and a wire bar method can be used.

At the time of coating, the magnetic field is oriented in the film flow direction. In this embodiment, a horizontal magnetic field of 3000 Oe by a permanent magnet is used as the orientation magnetic field.
The orientation may be any direction such as a vertical direction and an oblique direction, but is preferably a horizontal direction (longitudinal direction of the card) or a vertical direction.

The coating was performed at a speed of 20 m / min. After the coating, the coating was dried at 100 ° C. for 2 minutes. The resulting coating film had a dry film thickness of 12 μm and a residual magnetic flux of 1.6 Mx /
cm, the squareness ratio was 0.89, and the coercive force was 2750 Oersteds.

After coating, the sheet is cut within one day without aging. This length is arbitrary. In this case, the coating film has not yet been sufficiently cured, and has poor heat resistance and solvent resistance. When the sheet is cut, as shown in FIG. 2A, a magnetic pole is generated in a cross section in the longitudinal direction of the sheet. In the case of the figure, the N pole is generated at the right end and the S pole is generated at the left end. However, depending on the direction of the aligning magnetic field, it may be generated in the opposite direction.

Next, as shown in FIG. 2B, the magnetic layer 1 was formed using a silk screen printing ink containing a high boiling point solvent.
Before the pattern 4 is cured, the pattern is printed and the printed pattern 1 is printed.
6 is formed. As the silk screen printing ink, those having the following compositions can be used. Pigment Red handle (red) 64 parts Thickener Bentonite 8 parts Dispersant Toho Kagaku brand name Phosphanol RE-960 3 parts Binder Union Carbide brand name VAGH 25 parts Solvent Solvesso # 100 22 parts Cyclohexanone 22 parts Butyl cellosolve 11 Department

The ink having the above composition was applied to a screen mesh (Tetron # 305) by using a screen mesh (tetron # 305) with a thickness of 1 mm and a length of 4 m.
A printing pattern 16 composed of a bar having a thickness of 5 μm and a thickness of m is printed.

Thereafter, after drying at room temperature for 5 minutes, drying is performed in an oven at 60 ° C. for 10 minutes.

When the printing pattern 16 is formed with the above-described silk screen printing ink, the portion of the magnetic layer 1 corresponding to the printing pattern 16 (the portion in contact with the printing pattern 16) is formed.
No. 4 is dissolved by the solvent in the printing ink. Therefore, as shown in FIG. 6, the orientation of the magnetic powder in this portion is disturbed, and the direction of magnetization is random. In the portion not corresponding to the print pattern 16, the direction of magnetization is aligned in the longitudinal direction. Such a difference in the direction of magnetization is detected by the detecting means as a difference in the saturation magnetization value, as shown in FIG. 4 described above, so that the magnetic pattern can be identified.

Thereafter, the magnetic layer 14 is cured by aging. Aging is performed at 60 ° C. for 100 hours or more. As a result, the oriented part and the disordered part are hardened and fixed, respectively. After curing, in the case of the silk screen printing ink, the magnetic layer 1 is dried at room temperature.
4 'is not dissolved.

Further, a dummy pattern 18 is printed at a position different from the print pattern 16 already formed by the silk screen printing ink. At this time, the magnetic layer 14 'under the newly printed dummy pattern 18 is not dissolved by the solvent contained in the dummy pattern 18, so that the magnetic orientation of this portion is not disturbed.

Thereafter, printing is performed with silver ink to form a concealing layer 20 for concealing the surfaces of the magnetic layer 14 ′, the print pattern 16 and the dummy pattern 18. The silver ink having the following composition can be used. Aluminum powder Asahi Kasei Aluminum powder paste MR-9000 100 parts Binder Union Carbide VAGH 120 parts Thickener Bentonite 10 parts Thinner MIBK 41 parts Cyclohexanone 41 parts Xylene 41 parts

Printing with silver ink is performed using Tetron #
This is performed by solid printing by silk screen printing using 305. Then, it is dried at 70 ° C. for 10 minutes. Thereby, the concealing layer 20 having a thickness of 2 μm is formed.

Further, a protective layer 22 is formed on the concealing layer 20. The material of the protective layer 22 is a material conventionally used as a protective layer in this type of magnetic recording medium, such as a cellulose resin, a urethane resin, a polyester resin, a vinyl resin, an epoxy resin, an acrylic resin, and the like. Can be used. To these resins, phthalic acid esters, fatty acid esters, orthophosphoric acid esters and the like can be added as plasticizers, and oleyl amide, stearyl amide, silicone, wax, etc. can be added as a material that imparts lubricity. Can be. In addition, an ultraviolet curable resin or an electron beam curable resin can also be used, and acrylic resin, epoxy resin, polyester resin, or the like can be used as the ultraviolet curable resin.

When the protective layer 22 is formed by printing, a commonly used ink is used as the ink, for example, UV offset ink, T & K
The TOKA UV peel wet OP varnish UP-2 is printed by solid printing to form a protective layer 22 having a thickness of 1 to 2 μm.

Note that, if necessary, before printing the protective layer 22, a notice or the like may be printed with black ink. Alternatively, color printing may be performed on the lower surface of the base material 12 in FIG. For such printing, UV offset printing is usually used.

Thereafter, the card is punched out by a punching machine into a predetermined size of the card, for example, a size specified in JISX-6311 to obtain a magnetic card.

The magnetic card manufactured in this manner is
When read by the magnetic head 30 as shown in FIG. 7, a detection voltage e as shown in FIG. 7 is obtained. That is, when the card is transported in the longitudinal direction and the magnetic head 30 is arranged at the position of the magnetic track 24 shown in FIG. 5, a detection voltage e is obtained. As can be seen from FIG. 5, the portion other than the print pattern 16 is DC-magnetized, and the portion corresponding to the print pattern 16 is not magnetized.
Output pulses as shown in FIG. Since the dummy pattern 18 has nothing to do with the magnetization of the magnetic track, no output pulse is obtained at both ends of the dummy pattern 18.

As described above, since a magnetic output is obtained corresponding to the print pattern 16, a permanent magnetic pattern can be detected. The output pulse is easier to detect if the azimuth of the magnetic head and the inclination of the edge of the print pattern 16 are made to match.

In such a magnetic card, digital data can be formed by changing the positions and widths of the print pattern 16 and the dummy pattern 18 in various ways, and this digital data can be used as security data for the card. The portion without a pattern is used for normal magnetic recording.

In each of the above embodiments, the concealing layer 20 and the protective layer 22 are provided. However, these layers may be omitted. Further, other layers may be provided as necessary.

[0045]

According to the present invention, a permanent magnetic pattern can be easily formed. Further, since the identification of the magnetic pattern can be made difficult by forming the dummy pattern with the same ink as the print pattern corresponding to the magnetic pattern, unauthorized use can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a magnetic recording medium according to the present invention.

FIG. 2 is a sectional view showing a manufacturing process of the magnetic recording medium according to the present invention.

FIG. 3 is a cross-sectional view illustrating a process of manufacturing a magnetic recording medium according to the present invention.

FIG. 4 is a diagram showing an example of a magnetization characteristic of a magnetic recording medium according to the present invention.

FIG. 5 is a diagram showing an embodiment in which the magnetic recording medium according to the present invention is applied to a magnetic card.

FIG. 6 is a diagram showing a state of magnetic orientation in a process of manufacturing a magnetic recording medium according to the present invention.

FIG. 7 is a diagram showing an example of output characteristics of a magnetic recording medium according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Base material 14 Magnetic layer 16 Print pattern 18 Dummy pattern 20 Concealment layer 22 Protective layer 24 Magnetic track 26 Barcode pattern 30 Magnetic head

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-262698 (JP, A) JP-A-4-201599 (JP, A) JP-A-5-89453 (JP, A) 143868 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B42D 5/00-15/10 G06K 19/06 G06K 19/10 G11B 5/80

Claims (6)

(57) [Claims] 1. A base material, a magnetic layer formed on the base material and magnetically oriented in a certain direction, and a print pattern formed on the magnetic layer with an ink capable of dissolving the magnetic layer. A magnetic recording medium, wherein the magnetic layer has a magnetic orientation in a part in contact with the print pattern, the magnetic orientation being disturbed, and a magnetic orientation in the fixed direction except for a part in contact with the print pattern. . 2. The magnetic recording medium according to claim 1, further comprising: a dummy pattern formed on the magnetic layer using the same ink as the print pattern after the magnetic layer is cured. A magnetic recording medium, comprising: a portion of the magnetic layer in contact with the dummy pattern being magnetically oriented in the fixed direction. 3. The magnetic recording medium according to claim 2, further comprising: a concealing layer provided on the print pattern and the dummy pattern; and a protective layer provided on the concealing layer. A magnetic recording medium comprising: 4. A method for producing a magnetic recording medium having a permanent magnetic pattern formed thereon, comprising: applying a magnetic paint containing magnetic powder to a base material; Forming a magnetic layer, and forming a predetermined print pattern on the magnetic layer with an ink containing a solvent capable of dissolving the magnetic layer and insoluble after curing of the magnetic layer, and corresponding to the print pattern. A method for manufacturing a magnetic recording medium, comprising: dissolving a magnetic layer to randomize magnetic orientation; and curing the magnetic layer. 5. The method according to claim 4, further comprising: forming a dummy pattern with the ink on the magnetic layer after the magnetic layer is cured, the method corresponding to the dummy pattern. The method of manufacturing a magnetic recording medium, wherein the magnetic orientation of the magnetic layer is in the fixed direction. 6. The method according to claim 5, further comprising: forming a concealment layer on the print pattern and the dummy pattern; and forming a protective layer on the concealment layer. A method for manufacturing a magnetic recording medium, comprising: