JP4071803B2 - Magnetic patterned magnetic plate - Google Patents

Description

  The present invention relates to a magnetic plate attached to a data record carrier for the purpose of security of a prepaid card or the like.

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. 6-286368 “Recording 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.
JP-A-6-286368

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) Irradiate a magnetic body with a laser to lose or change the magnetic characteristics of the unnecessary portion of the magnetic body.
2) An unnecessary portion of the magnetic material is removed by etching using photolithography / printing or the like.
However, these conventional methods have a drawback that it takes a long time for patterning or high cost.

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.

  An object of the present invention is to provide a magnetically patterned magnetic plate that eliminates the drawbacks of the prior art and can be implemented at low cost and with fewer steps.

In order to achieve this object, one form of a magnetically patterned magnetic plate according to the present invention is a flat portion which is a flat surface region and a non-planar surface region having unevenness on one surface. A non-magnetic material substrate having a roughened portion, and a magnetic film made of an amorphous ferromagnet deposited on the one surface, and the magnetic film is magnetic in the flat portion which is the flat surface region. The BH hysteresis magnetic characteristic peculiar to the amorphous ferromagnet of the film is maintained, and the maximum magnetic flux density of the BH hysteresis magnetic characteristic peculiar to the amorphous ferromagnet is reduced and maintained in the roughened portion which is the non-flat surface region. The magnetic force is increased, or the maximum magnetic flux density is decreased and the coercive force is lost.
In another embodiment of the magnetically patterned magnetic plate according to the present invention, a nonmagnetic material substrate having a flat portion which is a flat surface region on one surface, and at least a part of the one surface, A roughened portion having irregularities formed by the roughened ink, and a magnetic film made of an amorphous ferromagnetic material deposited on the one surface, the magnetic film being a flat surface region which is the flat surface region. The magnetic film retains the BH hysteresis magnetic characteristic unique to the amorphous ferromagnet, and reduces the maximum magnetic flux density of the BH hysteresis magnetic characteristic peculiar to the amorphous ferromagnet in the roughened portion which is the non-flat surface region. The coercive force is increased, or the maximum magnetic flux density is decreased and the coercive force is lost.

  According to the present invention, magnetic patterning is possible at a low cost in a short time, and a magnetic material plate that is easily magnetically patterned is provided, and the safety assurance function and tampering prevention of the target product can be achieved by embedding or joining the target product. There is an advantage that the function can be improved.

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, omits complicated processes such as etching, and prints or patterns a part of the surface (negative pattern part) other than the desired pattern by roughening the surface by physical or chemical methods. A magnetic film is to be formed on a magnetic 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.

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 roughening ink 3 is scattered (dispersed) three-dimensionally, which is the reason why it does not exhibit magnetic properties that should be inherent. On the other hand, since the magnetic film 2 formed on the substrate 1 is formed on the surface of the flat portion, the original BH hysteresis magnetic characteristic as shown in FIG. 5A or FIG. Show.
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. As a result, the magnetic film 2 directly formed on the surface of the substrate 1 exhibits the original BH hysteresis magnetic characteristics, but is formed on the uneven pattern (that is, the roughened portion) with the roughened ink 3. The formed magnetic film 2 does not exhibit the original BH hysteresis magnetic characteristics. Therefore, by using such a negative pattern, it is possible to create the magnetic plate 5 having the function of preventing falsification.

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. This is the reason why the magnetic film 2 on the roughened roughened rough portion is scattered (dispersed) three-dimensionally, which does not show the BH hysteresis magnetic characteristics that should be inherent. On the other hand, since the magnetic film 2 formed on the flat part that has not been treated is formed on a flat surface, it exhibits the original BH hysteresis 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.

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 FIG.
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. .

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.

  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 safety assurance function and tamper-proof function can be improved

1 is a schematic cross-sectional view showing an embodiment of the present invention. It is a flowchart which shows the manufacturing process of the Example of FIG. It is a section schematic diagram showing other examples of the present invention. It is a flowchart which shows the manufacturing process of the Example of FIG. It is a hysteresis characteristic figure of the magnetic body board by this invention. It is a hysteresis characteristic figure of the magnetic body board by this invention. It is a top view which shows the specific example of the record carrier formed using the magnetic body board by this invention. It is sectional drawing for demonstrating the conventional patterning. It is a flowchart which shows the process for performing the patterning of 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)

A non-magnetic material substrate having a flat portion which is a flat surface region and a roughened portion which is a non-flat surface region having unevenness on one surface;
A magnetic film made of an amorphous ferromagnet deposited on the one surface;
The magnetic film retains the BH hysteresis magnetic characteristics unique to the amorphous ferromagnet of the magnetic film in the flat portion which is the flat surface region, and the amorphous ferromagnet in the roughened portion which is the non-flat surface region. Configured to decrease the maximum magnetic flux density and increase the coercivity of the intrinsic BH hysteresis magnetic characteristic, or to decrease the maximum magnetic flux density and lose the coercivity,
A magnetically patterned magnetic plate characterized by the following.   A non-magnetic material substrate having a flat portion which is a flat surface region on one surface;
  A roughened portion having irregularities formed by a roughened ink on at least a part of the one surface;
  A magnetic film made of an amorphous ferromagnet deposited on the one surface;
  The magnetic film retains the BH hysteresis magnetic characteristic unique to the amorphous ferromagnet of the magnetic film in the flat portion which is the flat surface region, and the amorphous ferromagnet in the roughened portion which is the non-flat surface region. Configured to decrease the maximum magnetic flux density and increase the coercivity of the intrinsic BH hysteresis magnetic characteristic, or to decrease the maximum magnetic flux density and lose the coercivity,
  A magnetically patterned magnetic plate characterized by the following.

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