JPH10149912A - Magnetic card, and its forgery prevention method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic card difficult of forgery and its forgery prevention method. SOLUTION: A first magnetic layer 13 lies discontinuously in an optional form to one part within the main face of a card substrate 1 or the whole face, and an organic high polymer layer 14 is made around and above the first magnetic layer 13, and a magnetic layer 15 is made on the organic high polymer layer 14, and magnetic information is stored on the second magnetic layer 15. Moreover, a card reader is set so that the head of itself may read in only the signal from the second magnetic layer 15 where magnetic information is stored. When using a card, the first magnetic layer 13 and the second magnetic layer 15 are pressed, according to the used amount of the money, and these two magnetic layer are brought close to each other. When the two magnetic layer are brought close to each other, the relative distance between the first magnetic layer 13 close to a card substrate 12 and the head of the card reader becomes short, and the magnetization of the first magnetic layer 13 is outputted to the head. As a result, the output signal intensity becomes discontinues unlike before use, whereby it is detected that this has been used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording medium, a method for manufacturing the same, and a magnetic information recording system, and more particularly to a magnetic card excellent in prevention of forgery, which makes it difficult to rewrite predetermined information recorded thereon, and a forgery thereof. It concerns prevention methods.

[0002]

2. Description of the Related Art A magnetic card of this type is used as a ticket, a telephone card, a prepaid card, or other cash voucher. Each time a magnetic card is used, it is used by rewriting predetermined information such as a balance on a magnetic recording layer provided on the magnetic card in a predetermined device. In order to prevent forgery, these magnetic cards are provided with a protective layer on the magnetic recording layer or a multilayered magnetic recording layer.

[0003]

However, with the spread of the magnetic card, the technology of reproducing and recording the information on the magnetic card has been developed, and the information recorded on the magnetic card can be easily read and further written. It has become possible.
Specifically, every time a magnetic recording card is used, all information including new information is rewritten so that it is overwritten on old information. Information can be rewritten in
Forgery of cards has become easier, and in recent years, forgery of magnetic cards has increased remarkably.

It is an object of the present invention to provide a magnetic card which cannot easily rewrite information and is difficult to forge, and a method for preventing the forgery.

[0005]

According to the present invention, a card base having a main surface, a first magnetic layer discontinuously formed in an arbitrary shape on the main surface, and the first magnetic layer And a second magnetic layer formed on the organic polymer layer formed above and around the organic polymer layer.

[0006]

According to the present invention, the magnetization of the magnetic layer storing the magnetic information of the magnetic card is changed after the use of the magnetic card. That is, when using the magnetic card of the present invention,
The first magnetic layer and the second magnetic layer are pressure-bonded in accordance with the usage amount, and the two magnetic layers are brought close to each other. When these two magnetic layers are brought close to each other, the relative distance between the first magnetic layer close to the card base and the head of the card reader becomes shorter, and the magnetization of the first magnetic layer is also output to the head. When the signal strength becomes discontinuous unlike before the use, it is detected that the signal has already been used. Therefore, even if the used magnetic card is overwritten and forged / recorded, it is detected that the used magnetic card has been used because the output signal strength is discontinuous, so that forgery is impossible.

When the magnetic card of the present invention is pressure-bonded, it is desirable that the organic polymer is easily rolled by heating so that the resin of the card base and the resin of the binder of the magnetic layer are not softened.

The organic polymer used in the present invention is preferably one that is easily rolled, has a relatively low molecular weight, a short side chain, and a structure close to a straight chain. As a specific example,
Examples include polyethylene, paraffin wax, and polyurethane.

A protective layer (including a soft magnetic layer) may be formed on the second magnetic layer, if necessary, similarly to the conventional magnetic card.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic card 11 shown in FIG. 1 is used as a ticket, a telephone card, or a cash voucher such as a prepaid card. The magnetic card 11 has a base 12 made of polyethylene terephthalate (PET) resin.
A first magnetic layer 13 is formed on the main surface of the first magnetic layer, and an organic polymer layer 14 is further formed around and on the first magnetic layer 13.
5. A protective layer 16 is formed as required.

Referring to FIG. 2, a magnetic recording system according to an embodiment of the present invention will be described. On the second magnetic layer 15,
Information recording area groups 17 are provided at predetermined intervals on the card substrate along the vicinity of the long side in the longitudinal direction. The information recording area group 17 records information that must be rewritten at the time of use, such as the amount of money used. The position where the information recording area group 17 is formed corresponds to the position of the first magnetic layer 13.

After the use of the magnetic card of the present invention of FIGS. 1 and 2, it changes as shown in FIG. Magnetic card 1 of FIG.
1 indicates that the organic polymer layer 14 is rolled in accordance with the usage amount, the first magnetic layer 13 and the second magnetic layer 15 are pressed, and the position of the information recording area group 17 shown in FIG. Are in close proximity.

[0013]

Next, a magnetic card according to an embodiment of the present invention will be specifically described.

A barium ferrite magnetic powder was mixed with a resin and a solvent at the following ratios to prepare a magnetic paint.

Barium ferrite magnetic powder 40 parts by weight Acrylic resin 17 parts by weight Vinyl chloride / vinyl acetate copolymer resin 28 parts by weight Toluene 100 parts by weight The obtained magnetic paint is treated with polyethylene terephthalate (P)
On the substrate of ET), coating was performed so as to have a size of 1 × 1 mm in 200 places and a coating thickness of 10 μm, and dried to form a first magnetic layer 13 on the substrate.

Next, a solution prepared by dissolving 20 parts by weight of polyethylene having an average molecular weight of 8000 in 100 parts by weight of toluene as a solvent is applied around and on the formed magnetic layer 13.
Coating was performed so as to have a thickness of 0 μm, and drying was performed to form an organic polymer layer 14.

The magnetic coating material was applied on the formed organic polymer layer 14 so as to have a coating thickness of 10 μm, and was dried. As a result, a second magnetic layer 15 was formed.

The magnetic layer 15 of the magnetic card thus obtained is applied to the magnetic layer 15 using a magnetic head (generated magnetic field of about 5 kG).
Recording was performed in the longitudinal direction of the card by the FM method. In addition,
At this time, the distance of the magnetic head was adjusted so that recording was not performed on the magnetic layer 13. When the recorded information was read using a magnetic card reader / writer, all the magnetic information could be read.

Next, a part of the information recording area group 17 is
It was pressed by a roll while being heated to ℃, and the portion was magnetized using the above magnetic card reader / writer. When the information recorded on the magnetic card was read, the information recording area group 17 that was pressed was able to recognize that the magnetization of the magnetic layer 13 was read by the head signal and the signal intensity changed, and that the information was used. Was.

Next, the same information as before use was written into the compressed information recording area group 17 to read the recorded information, but the signal intensity was changed due to the magnetization of the magnetic layer 13.
It can be recognized that it has been used.

In this embodiment, the same magnetic powder is used for the first magnetic layer 13 and the second magnetic layer 15, but if necessary, magnetic powders having different magnetic properties can be used.
Obviously, a similar effect can be obtained.

[0022]

As described above, according to the magnetic card of the present invention, it is difficult to rewrite predetermined information recorded on the magnetic card for the purpose of forgery. Prevention methods can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a magnetic card according to an embodiment of the present invention, taken along a line II in FIG. 2;

FIG. 2 is a plan view of the magnetic card manufactured in FIG. 1 as viewed from the magnetic layer side.

FIG. 3 is a cross-sectional view showing a state where the magnetic card of FIG. 1 is crimped after use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Magnetic card 12 Card base 13 1st magnetic layer 14 Organic polymer layer 15 2nd magnetic layer 16 Protective layer 17 Information recording area group

Claims (2)

[Claims] 1. A card base having a main surface, a first magnetic layer discontinuously formed in an arbitrary shape on the main surface, and an organic high layer formed around and above the first magnetic layer. A molecular layer,
And a second magnetic layer formed on the organic polymer layer. 2. The method according to claim 1, further comprising the step of pressing the first magnetic layer and the second magnetic layer and bringing the two magnetic layers close to each other when using the magnetic card according to claim 1. To prevent forgery of magnetic cards.