JP4071305B2 - Method for producing magnetically patterned magnetic plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a magnetic plate attached to a data record carrier for the purpose of security of a prepaid card or the like.
[0002]
[Prior art]
The prepaid cards that are currently most frequently used in Japan as recording media cards include a telephone card issued by NTT (Nippon Telegraph and Telephone Corporation) and a pachinko game card issued by the Japanese leisure card system.
These cards are easily altered and tampered with and are now a major social problem. Japanese Patent Application No. 5-094846 (Japanese Patent Laid-Open No. Hei 6-286368 “Recording carrier card and its authenticity determination device” ) has been proposed by the applicant of the present application as a countermeasure against tampering and falsification of these cards.
In this invention, the record carrier card has a first recording area for recording management object information, an amorphous ferromagnetic layer disposed at a position different from the first recording area, and a necessary number of punch holes. And a second recording area that is provided with a plan to open a gap. The second recording area has a configuration in which a security code is recorded.
For cards having these configurations, the presence or absence of punch holes punched in the second recording area is magnetically read out and compared with the management information recorded in the first recording area. The method of judging the presence or absence is taken.
[0003]
[Problems to be solved by the invention]
According to the invention of the prior application, as a method of preventing malicious tampering, the composition that cannot be normally obtained and the magnetic characteristics peculiar to the material are used, and the second recording area of the card is written in advance so that it cannot be rewritten. A method of using a security code is presented.
In order to write this security code, it is necessary to form a magnetic pattern that can be read magnetically. As a method of forming this magnetic pattern, in general,
(1) a laser is irradiated to the magnetic or abolish the magnetic properties of the magnetic material of the unnecessary part or alter its magnetic properties.
(2) Unnecessary portions of the magnetic material are removed by etching using photolithography / printing.
However, these conventional methods have a drawback that it takes a long time for patterning or high cost.
[0004]
That is, FIG. 8 is an example of forming a magnetic pattern using conventional etching, and is an enlarged schematic diagram of the magnetic pattern. Here, 1 is a base material, 2 is a magnetic film, and 4 is a protective layer. According to this conventional example, it is necessary to take many steps to form a magnetic pattern with or without the magnetic body 2 and to remove unnecessary portions of the magnetic body.
The flowchart of the main steps of this conventional example is as shown in FIG. However, A is an etching method using photolithography, and B is an etching method using printing.
According to the conventional example, a very long process of 5 to 6 processes is required for patterning.
First, in the method A, the magnetic film 2 is formed on the entire surface of the substrate 1 in the step f31. Next, a predetermined positive pattern photoresist is applied on the magnetic film 2 in step f32. In step f33, exposure is performed to cure the positive pattern resist. In step f34, development is performed to remove the negative pattern resist. Etching is performed in the step f35, and then the resist is peeled off in the step f36 to form a final magnetic pattern by the magnetic film 2. Thus, the method A requires a total of 6 steps, and the work efficiency is extremely poor.
In the method B, the magnetic film 2 is first formed on the entire surface of the substrate 1 in the step f41. Next, in step f42, a resist ink is printed on the magnetic film 2 in a predetermined pattern to form a positive pattern. Drying is performed in step f43, etching is performed in step f44, and then the resist is peeled off in step f45 to form a final magnetic film pattern.
As described above, the method B also requires a total of 5 steps and has a problem that workability is extremely poor.
[0005]
An object of the present invention is to provide a method of manufacturing a magnetically patterned magnetic plate that eliminates the disadvantages of the prior art and can be implemented at low cost and with fewer steps.
[0006]
[Means for Solving the Problems]
In order to achieve this object, one method of manufacturing a magnetically patterned magnetic plate according to the present invention uses an ink whose surface is roughened in a partial region of a flat surface of a nonmagnetic material substrate. A negative pattern is printed to provide irregularities, and a magnetic film made of an amorphous ferromagnetic material is formed in a thickness range of 0.01 to 0.1 μm on the surface of the nonmagnetic material plate on which the negative pattern is printed. The BH hysteresis magnetic characteristic specific to the amorphous ferromagnet of the magnetic film is maintained on the flat surface region, and the B- characteristic peculiar to the amorphous ferromagnet on the negative pattern of the uneven magnetic non-magnetic ink. The maximum magnetic flux density of the H hysteresis magnetic characteristic is decreased to increase the coercive force, or the maximum magnetic flux density is decreased and the coercive force is lost.
In another method of manufacturing a magnetically patterned magnetic plate according to the present invention, unevenness is physically or chemically provided in a partial region of a flat surface on a nonmagnetic material substrate, and the unevenness is formed. Further, a magnetic film made of an amorphous ferromagnetic material is formed on the surface of the nonmagnetic material plate in a thickness range of 0.01 to 0.1 μm , and the amorphous ferromagnetic material of the magnetic film is formed on the flat surface region. The inherent BH hysteresis magnetic characteristic is maintained, and the maximum magnetic flux density of the BH hysteresis magnetic characteristic is decreased and the coercive force is increased on the uneven surface region, or the maximum magnetic flux density is decreased and maintained. The structure is characterized in that the magnetic force is lost.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Since the magnetic substance used in the present invention is basically a thin film formed by vapor deposition such as vapor deposition or sputtering, the surface roughness (Ra) of the substrate on which the thin film is formed when detecting the magnetic properties of the thin film. Unless it is about several μm or less, the magnetic properties inherent to the magnetic material do not appear. For example, a PET film having a flat surface region (hereinafter referred to as a flat portion) having a surface roughness of about 0.01 to 0.1 μm or less is used as the substrate.
At this time, when a magnetic material is formed on a non-flat region (hereinafter referred to as a roughened portion) on a porous substrate having a surface roughness of several μm or more, the original nature of the formed magnetic material The BH hysteresis magnetic characteristics of the magnetic field do not appear, and the magnetic detection signal becomes weak or disappears.
The present invention utilizes this phenomenon, eliminates complicated steps such as etching, and patterned by roughening the portion of the surface in a desired region other than the pattern printed (negative pattern portion) or physical or chemical means A magnetic film is to be formed on a nonmagnetic material substrate.
Examples of the physical or chemical method include various methods such as providing irregularities in the negative pattern portion with a press, and roughening with a chemical that roughens the surface with laser processing.
For example, when patterning a prepaid card, the patterning can be directly applied to the card, or after being formed on a thin base material different from the card and patterned (called a magnetic thread), this is applied to the card. It is also possible to paste.
According to the present invention, patterning can be performed by only one process such as printing or pressing, and for example, processes such as resist coating, exposure, cleaning, etching, and peeling in photolithography can be omitted. Further, a time-consuming process such as laser processing can be eliminated, and a magnetic pattern can be formed at low cost.
[0008]
[Example 1]
Example 1 is an example of a magnetic plate 5 according to the present invention in which roughening ink is applied on a base material to provide a roughened portion having irregularities to form a nonmagnetic material substrate, and a magnetic pattern is formed on the nonmagnetic material substrate. It is an example. FIG. 1 shows a schematic diagram of a magnetic plate 5 with an enlarged magnetic pattern. Reference numeral 1 denotes a substrate, and a non-magnetic material having a flat surface such as a PET (polyethylene terephthalate) film having a thickness of 5 μm to 500 μm is used. Reference numeral 2 denotes a magnetic film. When the magnetic film 2 is made amorphous, cobalt Co-zirconium Zr system or iron Fe-silicon Si system is a typical composition. The magnetic film 2 can be formed by sputtering, vapor deposition, plating, etc., and its thickness can be 0.01 to 1.0 μm. The magnetic film 2 exists on both the base material 1 and the roughened ink 3. The magnetic film 2 on the roughened ink 3 is scattered (dispersed) three-dimensionally. As described above, the surface roughness of the roughened ink portion 3 (roughened portion) is several μm or more. cobalt - zirconium or iron - when silicon-based thickness of the magnetic film 2 made of amorphous ferromagnetic material is within the range of 0.01 to 0.1 m, it is not such exhibit magnetic properties should have originally (See FIG. 5 (b) or FIG. 6 (b)). On the other hand, since the magnetic film 2 formed on the base material 1 is formed on the surface of the flat portion, it exhibits the original magnetic characteristics as shown in FIG. 5 (a) or FIG. 6 (a). 3 is a roughening ink for forming a roughened portion, which is formed by binding particles of submicron to several tens of μm such as nonmagnetic metal, magnetic powder, carbon, ceramic, and resin with a binder (resin). is there. In the present invention, the surface roughness of this layer is sufficiently larger than the thickness of the magnetic film 2. Reference numeral 4 denotes a protective film, which is used for protecting the magnetic material or making it invisible and improving security. Further, when reading with the reading head, it works to keep the distance between the head and the magnetic body constant. However, in the present invention, this protective layer may or may not be provided. The flowchart of the main steps according to the first embodiment is as shown in FIG. First, in the first step f1, an uneven negative pattern is printed using the roughened ink 3 in a region other than the desired pattern, and in the second step f2, it is dried. Next, in the third step f3, a magnetic film (amorphous) 2 is formed by sputtering, vapor deposition, or the like. According to the first embodiment, patterning can be performed in a very short process of three steps. Thereby, the magnetic film 2 directly formed on the surface of the base material 1 exhibits the original magnetic characteristics, but the magnetic film formed on the uneven pattern (that is, the roughened portion) with the roughened ink 3. 2 does not show the original magnetic properties. Therefore, by using such a negative pattern, it is possible to create the magnetic plate 5 having the function of preventing falsification.
[0009]
[Example 2]
Example 2 is a nonmagnetic material substrate provided with a roughened portion having irregularities by roughening the surface of the base material 1 with a press, and a magnetic plate 5 according to the present invention in which a magnetic pattern is formed on the nonmagnetic material substrate. It is an example. FIG. 3 shows a schematic diagram of the magnetic plate 5 in which the magnetic pattern is enlarged. Reference numeral 1 denotes a base material, and a nonmagnetic material such as a PET (polyethylene terephthalate) film having a thickness of 5 μm to 500 μm is used. Reference numeral 2 denotes a magnetic film. The magnetic film 2 exists on both a roughened uneven surface area (roughened part) on the surface of the substrate 1 and a flat area (flat part) where nothing is treated. ing. The magnetic film 2 on the roughened roughened portion that is roughened will be three-dimensionally scattered (dispersed), and as described above, the surface roughness of the roughened portion is several μm or more, cobalt - zirconium or iron - when silicon-based thickness of the magnetic film 2 made of amorphous ferromagnetic material is within the range of 0.01 to 0.1 m, has such it shows the magnetic properties should have originally ( FIG. 5B or FIG. 6B). On the other hand, since the magnetic film 2 formed on the flat part which has not been processed is formed on a flat surface, it exhibits the original magnetic characteristics. 4 is a protective layer used to protect the magnetic material or to make it invisible and to improve security. Further, when reading with the reading head, it works to keep the distance between the head and the magnetic body constant. However, in the present invention, this protective layer may or may not be provided. The flowchart of the main processes by Example 2 is as FIG. First, in the first step f11, the negative pattern region of the substrate 1 is roughened by providing unevenness using a press, and then in the second step f12, the magnetic film (amorphous) 2 is formed by sputtering, vapor deposition or the like. . According to Example 2, patterning can be performed in a very short process of two steps. Thereby, the magnetic body plate 5 which has a tampering prevention function similarly to Example 1 can be produced.
[0010]
In the above embodiment, the principle of magnetic characteristic discrimination is, for example, utilizing the BH characteristic of a ferromagnetic material [Japanese Patent Application No. 7-018343 “Safety Protective Paper and its Truth” In the case of a thin film of amorphous ferromagnetic material, a square BH hysteresis characteristic, which is the original magnetic characteristic with a small coercive force Hc as shown in FIG. In the roughened portion, the non-square hysteresis characteristic in which the maximum magnetic flux density Bm is decreased and the coercive force Hc is increased as shown in (b).
FIG. 6 shows the case of a magnetic layer having a large coercive force Hc with a thick film thickness. (A) shows the original magnetic characteristics obtained at the flat part, and (b) shows the magnetic characteristics obtained at the roughened part. There is almost no hysteresis characteristic. As is clear from these characteristic examples, according to the present invention, there is a clear change in magnetic characteristics between the flat portion and the roughened portion, and these regions can be distinguished from each other using these differences. .
[0011]
FIG. 7 shows a specific example of a record carrier called a magnetic card made by using the magnetic plate 5 according to the present invention, wherein 11 is a magnetic card body usually made of a resin material, and 5 is a magnetic card according to the present invention. A body plate, 12 is a security code, and 13 is a punch hole. This example shows a case where the magnetic plate 5 is coupled to the magnetic card main body 11. The appearance is the same as that of a conventional general magnetic card, but it can be applied to a target product only by increasing the number of steps for embedding the magnetic plate 5 according to the present invention. In addition, since the base material 1 of the magnetic body plate 5 is a nonmagnetic material, it can also be used as the magnetic card body 11. In this case, since the magnetic card body 11 itself corresponds to the base material 1, an embedding process is not required, and an inexpensive record carrier can be realized. Further, the security code 12 has a high anti-tampering function for patterning peculiar to the present invention, so that the safety of products such as a magnetic carrier card formed by using the magnetic plate 5 according to the present invention. Special effects such as improvement of the guarantee function can be exhibited.
[0012]
【The invention's effect】
As described above, according to the present invention, magnetic patterning can be performed at low cost in a short time, and a magnetic plate that is easily magnetically patterned is provided and embedded in the target product or bonded to the target product. There is an advantage that the safety guarantee function and the falsification prevention function can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing an embodiment of the present invention.
FIG. 2 is a flowchart showing manufacturing steps of the embodiment of FIG.
FIG. 3 is a schematic sectional view showing another embodiment of the present invention.
FIG. 4 is a flowchart showing manufacturing steps of the embodiment of FIG. 3;
FIG. 5 is a hysteresis characteristic diagram of a magnetic plate according to the present invention.
FIG. 6 is a hysteresis characteristic diagram of a magnetic plate according to the present invention.
FIG. 7 is a plan view showing a specific example of a record carrier formed using a magnetic plate according to the present invention.
FIG. 8 is a cross-sectional view for explaining conventional patterning.
9 is a flowchart showing a process for executing the patterning of FIG. 8. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base material 2 Magnetic film 3 Roughening ink 4 Protective film 5 Magnetic board 11 Magnetic card body 12 Security code 13 Punch hole

Claims (2)

On the surface of the nonmagnetic material plate on which the negative pattern is printed by printing a negative pattern with an ink that roughens the surface on a part of the flat surface of the nonmagnetic material substrate. A magnetic film made of an amorphous ferromagnet is formed in a thickness range of 0.01 to 0.1 μm, and the BH hysteresis magnetic characteristic unique to the amorphous ferromagnet of the magnetic film is maintained on the flat surface region. On the negative pattern of the non-magnetic ink with unevenness, the maximum magnetic flux density of the BH hysteresis magnetic characteristic unique to the amorphous ferromagnetic material is decreased to increase the coercive force, or the maximum magnetic flux density is decreased. A method for producing a magnetically patterned magnetic plate, wherein the coercive force is lost. An unevenness is physically or chemically provided on a part of a flat surface on a nonmagnetic material substrate, and a magnetic film made of an amorphous ferromagnetic material is thickened on the surface of the nonmagnetic material plate on which the unevenness is formed. In the range of 0.01 to 0.1 μm, the BH hysteresis magnetic characteristic unique to the amorphous ferromagnet of the magnetic film is maintained on the flat surface region, and on the uneven surface region. Magnetic patterning is characterized in that the maximum magnetic flux density of the BH hysteresis magnetic characteristic inherent in the amorphous ferromagnet is decreased and the coercive force is increased, or the maximum magnetic flux density is decreased and the coercive force is lost. A method for producing a magnetic plate.

Images