JPH10163020A - Manufacture and usage of magnetic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent forging of a magnetic card. SOLUTION: A heat-contracting magnetic layer 13 containing magnetic powder is adhered to a card substrate 12 and is coated with a protective layer 14. Magnetic information is recorded on the magnetic layer 13. When the magnetic card 11 is used up, a part 18 to be heated is heated by a thermal head for contraction and cracks 17 are produced. Since noises are produced, read and rewrite become impossible and forging is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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, a method for manufacturing the same, and a method for using the same.

[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. The magnetic card is used by rewriting predetermined information such as balance on a magnetic recording layer (a magnetic layer of an information recording portion) provided on the magnetic card by a predetermined device each time the magnetic card is used. 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, so if there is a device for recording and reproducing information on a magnetic card, Even when used, the information on the magnetic card can be easily rewritten, thereby facilitating the forgery of the magnetic card, and the forgery of the magnetic card has increased remarkably in recent years.

[0004] Therefore, a technical object of the present invention is to obtain a magnetic card which can prevent forgery of a used magnetic card.

[0005]

According to the present invention, there is provided a magnetic card having a heat-shrinkable layer containing a magnetic powder and a resin on the whole or a part of a card base.

[0006]

According to the present invention, the magnetic layer of the magnetic card, that is, the magnetic recording medium, which stores the magnetic information, is heated by the thermal head when used. The resin portion of the heated heat-shrinkable layer shrinks, and cracks occur in this portion. It can be determined from the crack that it has been used and cannot be reproduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to a magnetic card according to an embodiment of the present invention shown in FIG. 1, a heat-shrinkable layer (magnetic layer 13) containing a magnetic powder 15 and a resin 16 is adhered to a card base 12, and further thereon. After coating the protective layer 14 on the magnetic layer 13
The magnetic information is recorded on the. If the magnetic card has been used,
A portion (heating portion 18) of the magnetic recording information in which the used information is recorded is heated by a thermal head (not shown) each time it is used. By shrinking the resin 16 of the heat-shrinkable layer of the magnetic layer 13 to generate cracks 17, it is determined that reading and re-recording are impossible due to noise, so that a forgery preventing effect is obtained.

In the present invention, the magnetic layer 13 is described by taking as an example a state in which the surface of the heat-shrinkable layer is flat. However, the heat-shrinkable layer may be provided with fine stitch-like slits (not shown). good. As a result, cracks 1 due to contraction of the magnetic layer 13
7 can be generated reliably and uniformly. The same effect can be obtained by forming irregularities on the surface of the heat shrinkable layer of the magnetic layer 13.

[0009]

EXAMPLE A barium ferrite magnetic powder was mixed with a resin in the following ratio and subjected to a crosslinking treatment at 140 ° C. × 10 minutes. Further, a 200% stretching treatment was performed at 130 ° C. to produce a heat-shrinkable layer.

Barium ferrite magnetic powder 40 parts by weight Low-density polyethylene resin 21 parts by weight Vinyl chloride, vinyl acetate copolymer resin 24 parts by weight Dicumyl peroxide 5 parts by weight
The magnetic layer 13 was formed by adhering to a card substrate 12 of ET).

The magnetic card 11 shown in FIG. 1 is used as a voucher such as a ticket, a telephone card, or a prepaid card. The magnetic card 11 is a card base 1 made of polyethylene terephthalate (PET) resin.
The magnetic layer 13 is formed by bonding the above-mentioned heat-shrinkable layer containing magnetic powder on the main surface of No. 2, and a coating layer 14 for protecting the magnetic layer 13 is further formed thereon.

FIG. 2 is a cross-sectional view when the magnetic card 11 of FIG. 1 is heated to cause cracks 17 due to shrinkage of the resin 16 of the magnetic layer 13. Even if an attempt is made to read in this state, since the crack 17 exists in the magnetic layer 13, noise is generated and it is determined that reading is impossible.

Recording was performed on the magnetic layer 13 of the magnetic card 11 thus obtained in the longitudinal direction of the card using a magnetic head (generative magnetic field of about 5 kG) by the FM method. The magnetic information was read using a magnetic card reader / writer, and all the magnetic information could be read.

Next, after a portion of the information recording portion was heated by the thermal head, the recorded information was read using a magnetic card reader / writer, but the heated portion could not be read. However, all magnetic information in the unheated portion could be read.

In this embodiment, a heat-shrinkable layer (magnetic layer 1) is used.
Although the sheet is used in 3), a similar effect can be obtained by a method such as coating the card base 12.

[0016]

As described above, according to the present invention,
It is possible to provide a magnetic recording medium excellent in anti-counterfeiting, a method of manufacturing the same, and a method of preventing counterfeiting of a magnetic card, in which it is difficult to rewrite, such as erasing or overwriting, predetermined recorded information for the purpose of counterfeiting.

[Brief description of the drawings]

FIG. 1 is a sectional view of a magnetic card 11 manufactured in an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a state in which a crack 17 is generated by heating the magnetic card 11 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Magnetic card 12 Card base 13 Magnetic layer 14 Coating layer 15 Magnetic powder 16 Resin 17 Crack 18 Heated part

Claims (3)

[Claims] 1. A magnetic card having a heat-shrinkable layer containing magnetic powder and resin on the entire surface or a part of a card base. 2. A method for manufacturing a magnetic card, comprising bonding a heat shrinkable layer containing a magnetic powder and a resin between a card base and a magnetic layer in an information recording portion. 3. The magnetic card according to claim 1, wherein
Heating the magnetic layer of the information recording portion and shrinking the resin contained in the heat shrinkable layer to form a heated portion having cracks, so that it can be determined that re-recording is impossible. Characteristic usage of magnetic cards.