JPS6334099Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic recording medium that is difficult to falsify or forge.

For magnetic cards, a magnetic recording medium is attached to the card, various information is written on it, and the system is verified and operated by collating the written information. Unauthorized use by forging cards is occurring frequently, and it is hoped that more effective measures will be developed to prevent unauthorized use, especially for magnetic cards used for withdrawing cash at banks and the like. In addition, in the case of magnetic cards such as magnetic commuter passes that do not require verification by inputting a PIN number, the authenticity of the card must be determined solely by verification of the information recorded on the card. There is a need for even more reliable measures to prevent counterfeiting.

In order to meet these expectations and demands, the conventional magnetic layer has a structure that prevents tampering and counterfeiting.Firstly, it has a plurality of tracks with different coercive forces, and secondly, it has multiple magnetic layers, each layer having its own coercive force. A third type is one in which the magnetic layer is single but is formed by dispersing different magnetic powders.

The conventional structure described above is intended to make tampering and counterfeiting difficult by complicating the structure of the magnetic layer and prevent unauthorized use. The act was being done.

Furthermore, in the first conventional method, since a separate dedicated magnetic head is required for each track with a different coercive force, only a single magnetic head was provided for a single track before that. There is an economic disadvantage in that the modification requires a dedicated magnetic head for each track in the terminal, which is accompanied by an economic burden.
In the conventional method, when two magnetic layers are stacked, the spacing loss of the lower layer increases, the magnetic properties deteriorate, and there are technical drawbacks such as making it difficult to read the information recorded on the lower layer. In addition, in the third conventional method, for example, when two types of magnetic powder are used and dispersed, they are not uniformly dispersed at exactly the same ratio, which causes large fluctuations in output. There are technical drawbacks. In this invention, such incomplete falsification and counterfeit prevention effect,
It was devised as an alternative to the conventional structure, which had economical and technical drawbacks, and made it completely impossible to copy, falsify, or forge by magnetic transfer, and it also made it impossible to modify or forge the terminal like the conventional structure. The object of the present invention is to provide a magnetic recording medium that can be used without causing any technical disadvantages to machines.

That is, the present invention relates to a magnetic recording medium in which a plurality of magnetic stripes having different coercive forces are provided in parallel in one track width of a magnetic layer to form a predetermined magnetic layer width. A description will be given according to the illustrated embodiment.

FIG. 1 shows an example when used in a one-track system, in which 1a, 1b, 1c, 1
d and 1e each have a low coercive force magnetic stripe, and 2
a, 2b, 2c, and 2d each indicate a high magnetic force magnetic stripe. That is, in this embodiment, magnetic stripes are alternately formed in a predetermined magnetic layer width (m) using magnetic materials having two types of coercive force. The magnetic stripe is formed by a gravure method, a nozzle method, a silk screen method, or the like.
Note that (t) is the track width, so in this example, the low coercive force magnetic stripes 1b, 1
c, 1d and high coercive force magnetic stripes 2b, 2c are located within the track width (t) and are the objects to be read. In this embodiment, the coercive force is different for each magnetic stripe, but the magnetic stripe may be further divided vertically, and the coercive force may be different for each divided section.

FIG. 2 shows another embodiment of the present invention, which is a two-track system.
In other words, magnetic stripes 1 and 2 with different coercive forces
are provided alternately, but the track width for each magnetic head within the magnetic layer width (m) ( _t1 is dedicated to high coercive force, _t2 is dedicated to low coercive force) The reading is performed within the system.

Each of the embodiments having the above configuration is attached to the surface of the card body 3 as shown in FIG. 3, and is used for a magnetic card or the like.

The information to be recorded is written for each magnetic stripe using a dedicated head that corresponds to the coercive force of the magnetic stripe.In the terminal device, the information pre-written on the high coercive force magnetic stripe is written in the low coercive force magnetic stripe. Rewrite and read data using a dedicated head.

Furthermore, the classification of magnetic stripes can be done by software. In other words, how many centimeters from the tip of the magnetic stripe are considered low coercive force?
The configuration of the magnetic stripe can be arbitrarily set and changed simply by changing the program to make the magnetic stripe a high coercive force magnetic layer. In addition, it is desirable that the difference in coercive force between adjacent magnetic stripes is at least three times greater to avoid mutual influence.As a specific example, a low coercive force stripe is formed by H _c = 650O _e or In the case of 300 O _e , the high coercive force stripe can be set to H _c =3000 O _e or 1000 O _e .

As explained above, the present invention has the primary purpose of preventing unauthorized use of magnetic cards, etc.
The magnetic layer is composed of multiple magnetic stripes with different coercive forces, and by using only one of the magnetic stripes in one track, it is impossible to copy or falsify by magnetic transfer. Coercive force magnetic stripes are not easily affected by external magnetic fields, so they can be converted into semi-permanent information, and can be used, for example, as verification codes or check codes. Tampering or forgery can be easily detected by comparing the information written on the low coercive force stripes. Thirdly, when the magnetic stripe is divided by software, the division can be arbitrarily set simply by changing the program, and the complexity of the division setting makes falsification and forgery virtually impossible. Fourthly, in the present invention, since the magnetic layer is divided into a plurality of parts, any of the magnetic stripes can be used as a magnetic background pattern (or watermark).

Fifth, since two or more types of magnetic stripes are formed in a thin line, it is difficult to counterfeit an equivalent magnetic card, and it is also impossible to tamper with it. falsification in terms of,
It is possible to prevent counterfeiting and prevent fraudulent acts related to magnetic recording media.

In addition, in the case of a terminal device in which this is used, the magnetic recording medium according to the present invention can be adopted without modification such as installing a new dedicated magnetic head, etc.
It has many effects.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a front view showing another embodiment of the present invention, and FIG. 3 is a front view when applied to a magnetic card. 1a, 1b, 1c, 1d, 1e...Low coercive force stripes, 2a, 2b, 2c, 2d...High coercive force stripes.

Claims (1)

[Claims for Utility Model Registration] 1. A magnetic recording medium characterized in that a plurality of parallel magnetic stripes having different coercive forces are provided in one track width of a magnetic layer to form a predetermined magnetic layer width. 2. A magnetic recording medium as set forth in claim 1 of the utility model registration, characterized in that the coercive force of each adjacent magnetic stripe differs by at least three times or more.