JP2000048356A - Encoding method for magnetic recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the alteration and the unauthorized use of a magnetic recording medium by performing the encoding of magnetic codes in a state in which a magnetic coating film is not yet dried after applying a magnetic coating material on a substrate and fixing magnetically recorded data while drying the coating film at the instant to make the erasing and the rewriting of the magnetically recorded data impossible. SOLUTION: After a magnetic coating material is applied on a substrate, the encoding of magnetic recording data is performed in a state in which a magnetic coating film is not yet dried and magnetically recorded data are fixed by drying the film at the instant. As a result, the erasing the rewriting of the magnetically recorded data is made impossible. Thus, the altering and the forging of a magnetic prepaid card or the like is made impossible. It may be permitted that the encoding of magnetic recording data is performed as to only fixed items and the magnetic encoding of variable data is performed by performing a normal magnetic orientation processing as to the others.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for encoding magnetic data in a state where a magnetic coating film is not dried after applying a magnetic coating material on a surface of a substrate, and immediately drying the encoded magnetic data to fix the magnetic recording data. The present invention relates to a magnetic recording medium encoding method that makes it impossible to erase and rewrite magnetically recorded data.

[0002]

2. Description of the Related Art In recent years, magnetic prepaid cards are rapidly spreading and the fields of use are expanding. However, the present situation is that troubles caused by forgery or falsification of used cards such as magnetic prepaid cards do not stop. The reason is that in the conventional magnetic recording medium, the magnetic recording data can be easily erased and written, so that the magnetic data in the magnetic layer of the used prepaid card can be erased and rewritten to be used illegally. Was.

[0003] In a conventional magnetic recording medium, a magnetic paint is applied on a base material, a magnetic field is oriented in a constant magnetic field, and the magnetic paint is dried and fixed through a drying furnace. Since the magnetic recording data is encoded using the magnetic recording medium manufactured as described above, the recorded magnetic data can be erased and written. This has the advantage that the magnetic recording method can be used repeatedly, but has the disadvantage that the magnetic recording data can be forged or falsified. The present invention, after applying the magnetic paint on the substrate, to encode the magnetic recording data in a state where the magnetic coating is not dried, immediately dried to fix the magnetic recording data,
Erasing and rewriting of magnetic recording data on the magnetic recording medium according to the present invention becomes impossible, and alteration and unauthorized use of the magnetic payment card becomes impossible.

[0004]

In order to achieve the above-mentioned object, a magnetic recording medium according to the present invention comprises: And drying immediately to fix the magnetic recording data. In some cases, magnetic recording data is encoded only for certain items, and other magnetic field orientation processing is performed to perform variable data magnetic encoding.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION After a magnetic paint is applied on a base material, the magnetic recording data is encoded while the magnetic coating film is in an undried state, and immediately dried to fix the magnetic recording data. Erasing and rewriting of magnetic recording data becomes impossible. This makes falsification and forgery of the magnetic prepaid card impossible.

[0006]

EXAMPLE A magnetic paint of the following composition A was applied on a base of a white polyester film having a thickness of 188 μm, information was encoded at a constant frequency density, and dried, and a magnetic layer having a coating thickness of 7 μm was provided. Was. [Composition A] _r-F e2 _{O 3} powder 100 parts by weight (coercivity 300θ _e, the average particle diameter 0,5Myuemu) Polyester resin 30 parts by weight (manufactured by Toyobo Co., Ltd.: Byron) Isocyanate resin 3 parts (Nippon Polyurethane Coronate L 60 parts by weight of MEK 60 parts by weight of MIBK 60 parts by weight of toluene Next, a coating material of the following composition B was applied thereon and dried to form a protective layer having a coating thickness of 3 μm. [Composition B] 100 parts by weight of polyvinyl chloride resin (Sekisui Chemical: Esrec A) 5 parts by weight of polyethylene wax (Sanyo Chemical: 151P) Isocyanate resin (Nippon Polyurethane: Coronate L) 300 parts by weight of MEK 300 parts by weight of toluene The magnetic recording medium thus obtained had an output waveform as shown in FIG. Next, the pre-encoded magnetic recording medium was erased using a high coercive force compatible type reader / writer having a normal coercive force of 2750θe.
As shown in the figure, the output waveform was obtained and the encoded magnetic data did not suffer any damage. On the other hand, a magnetic paint of composition A was applied and dried as in the prior art, and then a protective layer of composition B was formed thereon. When the magnetic recording data thus formed was encoded on the magnetic recording medium at a constant frequency density and erased using a high coercive force compatible read writer, the magnetic recording data was completely erased.

[0007]

According to the present invention, after applying a magnetic paint on a substrate, encoding of magnetic data is performed in a state where the magnetic coating is not dried,
By immediately drying and fixing the magnetic recording data, erasing and rewriting of the magnetic data on the magnetic recording medium become impossible, and forgery and falsification of the magnetic prepaid card and the like become impossible.

[Brief description of the drawings]

FIG. 1 is an output waveform of magnetic recording data pre-encoded by a method according to the present invention.

FIG. 2 is an output waveform of magnetic recording data after erasing using a high coercive force compatible read writer.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisao Ito 5-20-5 Hanada, Koshigaya-shi, Saitama F-term (reference) 5D031 AA06 BB10 CC20 5D091 AA11 BB06 DD01 GG40 HH01 5D112 AA05 AA28 BB08 CC11 CC18 CC19

Claims (1)

[Claims] Claims: 1. After applying a magnetic paint on a substrate, encode the magnetic data while the magnetic coating is in an undried state;
A method for encoding a magnetic recording medium, comprising drying immediately and fixing magnetic recording data.