JPH1064051A - Magnetic plate with magnetic patterning and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a magnetic film having a magnetic pattern produced in a small number of processes at a low cost by patterning in such a manner that the intrinsic magnetic characteristics of the magnetic film are maintained in a flat surface area while the characteristics are not maintained in a nonflat surface area. SOLUTION: A roughening ink 3 is applied and dried to print a rough negative pattern on the area except for a desired pattern on a base body 1. Then a magnetic film (amorphous) 2 is formed by sputtering. vapor deposition, etc. The magnetic film 2 directly formed on the surface of the base body 1 shows intrinsic magnetic characteristics, but the magnetic film 2 formed on the rough negative pattern (namely the roughened area) produced by the roughening ink 3 does not have the intrinsic magnetic characteristics, thereby, producing a magnetic plate 5 having a function to prevent alteration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic film attached to a data recording carrier for security of a prepaid card and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Prepaid cards which are most frequently used in Japan as recording media cards include telephone cards issued by NTT (Nippon Telegraph and Telephone Corporation) and pachinko gaming cards issued by the Japan Leisure Card System. is there. These cards are easily altered or tampered with,
Currently it is a major social problem. As a countermeasure against alteration and falsification of these cards, the applicant of the present invention has proposed a Japanese Patent Application No. 5-09846 (Japanese Unexamined Patent Application Publication No. 6-286368, entitled "Record carrier card and its authenticity judging device". The record carrier card has a first recording area for recording information to be managed, an amorphous ferromagnetic layer disposed at a position different from the first recording area, and a required number of punch holes. And a second recording area provided in anticipation of the above. In addition, the second recording area has a configuration in which security is recorded. In contrast, a method of magnetically reading out the presence or absence of a punched hole in the second recording area and comparing the management information recorded in the first recording area to determine whether or not tampering has been performed. I am taking.

[0003]

According to the invention of the prior application, as a method for preventing malicious tampering, utilizing a composition which is not usually available, a magnetic characteristic peculiar to the material, and a second recording method of the card There has been proposed a method of using a security code written in advance so that the area cannot be rewritten. To write this security code, it is necessary to form a magnetic pattern that can be read magnetically. As a method of forming the magnetic pattern, generally, a magnetic material is irradiated with a laser so that the magnetic material disappears or the magnetic characteristics are changed. The magnetic material is removed by etching using photolithography and printing. However, these conventional methods have a drawback that a long time is required for patterning or the cost is increased.

That is, FIG. 8 is an example in which a magnetic pattern is formed using conventional etching, and is a schematic diagram in which the magnetic pattern is enlarged. Here, 1 is a substrate, 2 is a magnetic film, 4
Is a protective layer. According to this conventional example, a magnetic pattern must be formed with or without the magnetic material 2, and many steps must be taken to remove the unnecessary portion of the magnetic material. FIG. 9 is a flowchart of the main steps of this conventional example. However, A is an etching method using photolithography,
B is an etching method using printing. According to the conventional example, a very long step of 5 to 6 steps is required for patterning. First, in method A, f31
In a step, a magnetic film 2 is formed on the entire surface of the base material 1. Then f
In step 32, a photoresist having a predetermined positive pattern is applied on the magnetic film 2. In step f33, exposure is performed to cure a positive pattern resist. In step f34, development is performed to remove the negative pattern resist. In step f35, etching is performed, and then in step f36, the resist is stripped to form a final magnetic pattern of the magnetic film 2. As described above, the method A requires a total of six steps, and the working efficiency is extremely poor. In the method B, f41
In the process, first, a magnetic film 2 is formed on the entire surface of the base material 1. Next, in a step f42, a resist ink is printed in a predetermined pattern on the magnetic film 2 to form a positive pattern. f
Drying is performed in the step 43, etching is performed in the step f44, and then the resist is stripped in the step f45 to form a final magnetic film pattern. As described above, the B method also requires a total of 5 steps, and has a problem of extremely poor workability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic patterned magnetic film which can eliminate the drawbacks of the prior art, is inexpensive and can be performed in a small number of steps, and a method for manufacturing the same.

[0006]

In order to achieve the above object, a magnetic patterned magnetic plate according to the present invention has a flat surface area and a non-flat surface area having irregularities on one surface. A non-magnetic material substrate, and a magnetic film adhered to the one surface, the magnetic film retains the original magnetic characteristics of the magnetic film in the flat surface region, and is formed in the non-flat surface region. It is configured such that patterning that does not retain the original magnetic characteristics is formed. One method of manufacturing a magnetic-patterned magnetic plate according to the present invention is to print a negative pattern with an ink whose surface is roughened in a part of the flat surface of the non-magnetic material substrate. A magnetic film is formed on the surface of the non-magnetic material plate on which the negative pattern is printed, and the magnetic properties inherent to the magnetic material are retained on the flat surface, and the unevenness of the non-magnetic material On the negative pattern of the body ink, the magnetic characteristics are lost or changed. Further, in another method for manufacturing a magnetic patterned magnetic plate according to the present invention, unevenness is formed physically or chemically in a partial area of a flat surface on a nonmagnetic material substrate, and the unevenness is formed. A magnetic film is formed on the surface of the non-magnetic material plate so that the magnetic properties inherent to the magnetic material are maintained on the flat surface, and the magnetic properties are lost or changed on the uneven area. It has a configuration characterized by being carried out.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The magnetic substance used in the present invention is basically a thin film formed by vapor phase growth such as vapor deposition or sputtering. Therefore, when detecting the magnetic properties of the thin film, a substrate on which the thin film is formed is used. Unless the surface roughness (Ra) of the magnetic material is not more than about several μm, the magnetic characteristics inherent to the magnetic material do not appear. For example, as a base material, the surface roughness is 0.01-0.
A flat surface area of about 1 μm or less (hereinafter referred to as a flat portion)
And the like. At this time, when a magnetic material is formed on a non-flat region (hereinafter referred to as a roughened portion) on the substrate such as a porous substrate having a surface roughness of several μm or more,
The magnetic properties of the deposited magnetic material do not appear, and the magnetic detection signal is weakened or disappears. The present invention takes advantage of this phenomenon, eliminates complicated steps such as etching, and prints or partially roughens a region (negative pattern portion) other than a desired pattern by a physical or chemical method. A magnetic film is to be formed on a substrate made of a magnetic material. Examples of the physical or chemical method include various methods such as providing unevenness in a negative pattern portion by pressing, and roughening the surface by a chemical that roughens the surface by laser processing. For example, when patterning a prepaid card, the patterning can be performed directly on the card. Alternatively, the film can be formed on a thin base material different from the card and patterned (called a magnetic thread). It is also possible to paste. According to the present invention, patterning can be performed in only one step such as printing or pressing,
For example, steps such as resist application, exposure, cleaning, etching, and peeling in photolithography can be omitted. Further, a time-consuming step such as laser processing can be eliminated, and a magnetic pattern can be formed at low cost.

[0008]

Example 1 In Example 1, a roughened ink was applied on a substrate, and a roughened portion having irregularities was provided to form a nonmagnetic material substrate, and a magnetic pattern was formed on the nonmagnetic material substrate. This is an example of the magnetic plate 5. FIG. 1 is a schematic view of a magnetic plate 5 in which the magnetic pattern is enlarged. 1 is a substrate, 5μ
A non-magnetic material having a flat surface such as a PET (polyethylene terephthalate) film having a thickness of m to 500 μm is used. 2 is a magnetic film. When the magnetic film 2 is made amorphous, a typical composition is cobalt Co-zirconium Zr or iron Fe-silicon Si. Methods for forming the magnetic film 2 include sputtering, vapor deposition, plating, and the like, and the thickness thereof can be 0.01 to 1.0 μm. The magnetic film 2 exists on both the substrate 1 and the roughened ink 3. The magnetic film 2 on the roughened ink 3 is three-dimensionally scattered (dispersed), which is the reason why the magnetic film 2 does not show the magnetic properties that should be originally possessed. 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. 5A or FIG. 6A. Reference numeral 3 denotes a roughened ink for forming a roughened portion, in which particles of submicron to several tens of μm such as non-magnetic metal, magnetic powder, carbon, ceramic, and resin are bound with a binder (resin or the like). 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 to protect the magnetic material or make the magnetic material invisible to improve security. Further, when the reading is performed by the reading head, the distance between the head and the magnetic body is kept constant. In the present invention, the protective layer may or may not be provided. FIG. 2 is a flowchart of main steps according to the first embodiment. 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 a 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. As a result, the magnetic film 2 directly formed on the surface of the base material 1 shows the original magnetic characteristics, but is formed on the negative pattern (ie, the roughened portion) having the unevenness by the roughening ink 3. No. 2 does not show the original magnetic properties. Therefore, by using such a negative pattern, the magnetic plate 5 having a tamper-proof function can be produced.

[0009]

Embodiment 2 In Embodiment 2, a nonmagnetic material substrate provided with a roughened portion having irregularities by roughening the surface of the substrate 1 itself by pressing, and a magnetic pattern is formed on the nonmagnetic material substrate according to the present invention. This is an example of the magnetic plate 5. FIG. 3 is a schematic view of the magnetic plate 5 in which the magnetic pattern is enlarged. Reference numeral 1 denotes a substrate made of a nonmagnetic material such as a PET (polyethylene terephthalate) film having a thickness of 5 μm to 500 μm.
2 is a magnetic film. The magnetic film 2 exists both on a roughened region (roughened portion) on a part of the surface of the substrate 1 and on a flat region (flat portion) on which no processing is performed. ing. The magnetic film 2 on the roughened portion having the roughened unevenness is three-dimensionally scattered (dispersed), which is the reason that the magnetic film 2 does not have the magnetic property which should be originally possessed. On the other hand, the magnetic film 2 formed on the flat portion on which no processing is performed exhibits the original magnetic characteristics because it is formed on the flat surface. Reference numeral 4 denotes a protective layer which is used to protect the magnetic material or make it invisible so as to improve security. Further, when the reading is performed by the reading head, the distance between the head and the magnetic body is kept constant. In the present invention, the protective layer may or may not be provided. FIG. 4 is a flowchart of main steps according to the second embodiment. First,
In the first step f11, the negative pattern area of the base material 1 is roughened by providing irregularities using a press, and then the second step f1 is performed.
In 2, a magnetic film (amorphous) 2 is formed by sputtering, vapor deposition, or the like. According to the second embodiment, patterning can be performed in a very short process of two steps. As a result, the magnetic plate 5 having the tamper-proof function can be manufactured as in the first embodiment.

In the above embodiment, the principle of the magnetic characteristic discrimination is based on, for example, the BH characteristic of a ferromagnetic material [Japanese Patent Application No. 7-018343 filed by the applicant of the present invention, entitled "Safety Protection Paper". And its authenticity determination device ”). In the amorphous ferromagnetic thin film, as shown in FIG.
Thus, a square BH hysteresis characteristic, which is an original magnetic characteristic having a small coercive force Hc, is obtained. In the roughened portion, the non-angular shape in which the maximum magnetic flux density Bm decreases and the coercive force Hc increases as shown in FIG. Type hysteresis characteristics are obtained. FIG. 6 shows a case of a magnetic layer having a large film thickness and a large coercive force Hc,
(A) is the original magnetic characteristic obtained in the flat part, and (b) is the magnetic characteristic obtained in the roughened part, and the hysteresis characteristic has almost disappeared. As is apparent from such a characteristic example, according to the present invention, there is a distinct change in magnetic characteristics between the flat portion and the roughened portion, and the two regions can be distinguished from each other by using these differences. .

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. , 12 is a security code, and 13 is a punched 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 the present invention 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. Since the substrate 1 of the magnetic plate 5 is a non-magnetic 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, the embedding process is not required, and an inexpensive record carrier can be realized. In addition, in order to perform patterning unique to the present invention in the part of the security code 12,
It has a high tamper-prevention function, and can exhibit special effects such as an improvement in the safety assurance function of a product such as a magnetic carrier card formed using the magnetic plate 5 according to the present invention.

[0012]

As described above, according to the present invention, magnetic patterning can be performed inexpensively and in a short time, and a magnetically patterned magnetic plate can be easily provided for embedding or coupling into a target product. Therefore, there is an advantage that the safety assurance function of the target product 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 a manufacturing process 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 a manufacturing process of the embodiment of FIG. 3;

FIG. 5 is a hysteresis characteristic diagram of the magnetic plate according to the present invention.

FIG. 6 is a hysteresis characteristic diagram of the 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.

FIG. 9 is a flowchart showing steps for executing the patterning of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Magnetic film 3 Roughened ink 4 Protective film 5 Magnetic plate 11 Magnetic card body 12 Security code 13 Punch hole

Claims (3)

[Claims] A non-magnetic material substrate having a flat surface area on one surface and a non-flat surface area having irregularities; and a magnetic film adhered to the one surface, wherein the magnetic film is A magnetic pattern, wherein the flat surface region retains the original magnetic characteristics of the magnetic film, and the non-flat surface region forms patterning that does not retain the original magnetic characteristics. Reinforced magnetic plate. 2. A non-magnetic material printed with a negative pattern by printing a negative pattern with an ink whose surface is roughened in a part of a flat surface of the non-magnetic material substrate. A magnetic film is formed on the surface of the plate, and the magnetic properties inherent to the magnetic material are retained on the flat surface, and the magnetic properties are lost on the negative pattern of the nonmagnetic ink having irregularities or A method for producing a magnetic-patterned magnetic plate characterized by being changed. 3. An unevenness is formed physically or chemically on a part of a flat surface on a nonmagnetic material substrate, and a magnetic film is formed on the surface of the nonmagnetic material plate on which the unevenness is formed. Wherein the magnetic properties of the magnetic body are retained on the flat surface, and the magnetic properties are lost or changed on the uneven area. Plate manufacturing method.