JPH0654522B2 - Method of judging authenticity of magnetic recording medium and magnetic recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Object of the invention [Industrial field of application] The present invention relates to a method for determining authenticity of a magnetic recording medium and a magnetic recording medium used therefor, particularly a magnetic card, a magnetic sheet, a magnetic conductor, Alternatively, the present invention relates to a magnetic recording medium authenticity determination method for providing a magnetic commuter pass or the like with an unauthorized use prevention function and a forgery / tampering prevention function, and a magnetic recording medium used therefor.

For magnetic recording cards, magnetic materials such as ferromagnetic metal oxides are mixed and dispersed with a binder or solvent, coated on a card substrate, etc., and dried to form a magnetic recording medium. The magnetic head of the information writing device magnetizes the magnetic recording medium to write information, and the magnetic head of the information reading device detects the residual magnetism of the magnetic recording medium to read the information. It is configured.

When such a magnetic recording medium is used as a savings passbook or a commuter pass, it is necessary to have a function of preventing unauthorized use or falsification.

[Prior Art] As a method of preventing this unauthorized use and forgery / alteration, conventionally, there is a method of putting a magnetic watermark in a magnetic recording medium.
This is a method in which the orientation direction of the easy axis of magnetization of the acicular magnetic powder is repeatedly changed with respect to the longitudinal direction (recording direction) of the surface of a magnetic recording medium such as a magnetic stripe to add an invisible magnetic pattern.

[Problems to be Solved by the Invention] However, although this magnetic pattern is not visible, it is a magnetic tape viewer.
According to et al., It is possible to magnetically detect and reproduce in a visible state, and since such a magnetic pattern can be magnetically transferred, compared with a normal recording system,
Although it is difficult to forge and falsify, it is not impossible to forge and falsify such magnetic patterns, and it is not always sufficient as a function for preventing unauthorized use and forgery and falsification. In addition, the terminals required here are complicated and difficult to maintain.

The present invention has been made in view of the above circumstances, magnetic tape viewer or the like in the magnetic recording medium with a genuine / counterfeit identification code is not visually observed for authenticity determination data, Further, the identification code for authenticity determination is not magnetically transferred, and the authenticity of the magnetic recording medium is easily and surely prevented. Therefore, the forgery / alteration of the magnetic medium can be easily and surely prevented. A magnetic recording medium authenticity determination method, and having such a function,
Moreover, it is an object of the present invention to provide a magnetic recording medium that is easy to manufacture and highly versatile.

(B) Configuration of the Invention [Means for Solving the Problem] To this end, the authenticity determination method for a magnetic recording medium according to the present invention provides an authenticity determination method for a data track on which data is magnetically recorded and a magnetic recording medium. Authenticity determination of a magnetic recording medium having a track for determining authenticity of a magnetic recording medium having a region where it is difficult or impossible to perform magnetic recording and reproduction in which a low coercive force magnetic material is formed in a predetermined shape or pattern that can be used as determination data. In the method, magnetic recording is performed on the magnetic recording medium authenticity determination track, and then the magnetic recording is performed based on data such as presence / absence of reproduction output on the magnetic recording medium authenticity determination track, interval, time, or number of the areas. It is characterized in that the authenticity of the medium is determined, and then the magnetic recording on the magnetic recording medium authenticity determination track is magnetically erased. Further, the magnetic recording medium of the present invention is a magnetic recording medium having a magnetic recording data track and a magnetic recording medium authenticity determination track, wherein the magnetic recording medium authenticity determination track is part of the authenticity of the magnetic recording medium. It is characterized by having a region in which it is difficult or impossible to carry out magnetic recording and reproduction formed of a low coercive force magnetic material in a predetermined shape or pattern that can be used as judgment data.

Hereinafter, details of the present invention will be described with reference to the drawings illustrating an embodiment.

In FIG. 1, reference numeral 1 denotes a magnetic recording medium, and the magnetic recording medium 1 is formed by applying a magnetic material such as a ferromagnetic metal oxide on the entire surface of a card substrate or the like by printing or the like.

The magnetic recording medium 1 is provided with one or a plurality of data tracks 2, and the data tracks 2 are areas in which personal information of the holder, information of the card issuer, and the like are recorded.
The structure of the magnetic recording medium described above is conventionally known.

Now, the identification code 3 for authenticity identification is provided in the area of the magnetic recording medium 1 other than the area of the data track 2. Identification code 3
Is formed with a predetermined shape or pattern that can be data for judging authenticity or selecting a type, as if it were a bar code. Is arranged on the track (judgment track 4) which passes through the judgment magnetic head when judging. The identification code 3 and the judgment track 4 are prepared in two rows in the embodiment shown in FIG. 1, but the number of rows may be one or three or more.

Of particular note, this identification code 3 makes magnetic recording and reproduction difficult or impossible. As a technique for making the identification code 3 incapable of writing and reproducing magnetic recording, the identification code 3 is formed on the magnetic recording medium 1 by printing using an ink containing a low coercive force magnetic material (high magnetic permeability magnetic material). Therefore, the magnetic recording medium 1 is covered with the low coercive force magnetic material only in the portion of the identification code 3, and the magnetic recording function of the low coercive force magnetic material makes it difficult to magnetically record and reproduce the magnetic recording medium 1 only in that portion. Alternatively, the non-magnetic layer may be formed on the magnetic recording medium 1 by the same means to make the magnetic recording and reproduction difficult or impossible. Moreover, the punched holes are formed in the magnetic recording medium 1.
Alternatively, a method of making magnetic recording and reproduction impossible may be used instead. As the low coercive force magnetic material that can be used here, a soft magnetic material such as soft ferrite or soft metal such as Ni—Zn or Mn—Zn magnetite having a coercive force of 150 Oe or less can be used. The thickness of the identification code 3 in that case is a thickness capable of exerting a magnetic shield effect, and is 6 μ, which is determined by the density of the low coercive force magnetic material, the coercive force, the write magnetic field strength, or the reproducing magnetic field strength. From the viewpoint of making it invisible from the outside, the thinner it is, the more preferable. A hiding layer made of white ink or the like is provided on the magnetic recording medium 1 and the identification code 3 to hide the identification code 3.

Next, a method for determining the authenticity of a magnetic recording medium using the magnetic recording medium having the above configuration will be described.

First, when issuing a magnetic card, etc., as shown in FIG.
Data 5 is recorded only on the data track 2.

Next, when using a magnetic card or the like, when a magnetic card or the like is inserted into the terminal at this time, the data 5 is reproduced and rewritten, and at the same time, it is particularly important that the recording head uses the judgment data. Data 6 for judgment on track 4
Is written, and immediately thereafter, the judgment data is reproduced by the reproducing head, the judgment data is read, and if necessary, the judgment head erases the judgment data immediately thereafter. It A reproduction output is obtained from the judgment data track 4 by the reproduction by the reproduction head, but the judgment data is neither written nor reproduced in the identification code 3 due to the magnetic shield effect or the like, so that a re-output is obtained from this portion. Absent. The authenticity of the magnetic recording medium can be determined as well as the type of the card based on the time, interval, number, etc. of the reproduction output of the determination data track 4. Finally, when the magnetic card etc. is taken out from the terminal, if the data 6 of the judgment data track 4 is already erased by the erasing head, the magnetic tape viewer also makes a judgment as in the case of issuing a magnetic card etc. This is effective because the data in (1) will not be visible. In this case, it is desirable that the width of the erasing head at the time of erasing is wider than the width of the identification code 3, and if the striped erasing pattern 7 after erasing is conspicuous, the judgment data is once issued at the time of ticketing. Truck 4
Erase the top so that it is not possible to distinguish before and after using the terminal. Furthermore, as shown in FIG. 3, if the erase pattern 7 is formed in advance in addition to the position of the determination data track 4 by erasing, it becomes difficult to determine the position of the determination data track 4. it can. If the erasing magnetic field is an AC magnetic field, it is possible to make the discrimination of the erasing pattern more difficult.

(C) Effect of the Invention In the authenticity determination method for a magnetic recording medium and the magnetic recording medium having the above-described configuration, particularly when the data for determination is erased, when the magnetic card or the like is in the user's hand. ,
The data for authenticity determination has been erased, and the data for authenticity determination cannot be visually checked even by a magnetic tape viewer. Also, since the identification code is not magnetized,
It is not possible to magnetically transfer, and eventually only the data 5 on the data track 2 can be magnetically transferred.
It is difficult to forge a magnetic recording medium by only transferring the data 5. Further, it is extremely difficult to falsify the identification code even when the data for judgment is not erased. Further, the identification code for authenticity determination can be formed by printing or the like, and the manufacture of a magnetic card or the like is extremely easy. Moreover, the identification code can be hidden by printing or the like so as to be invisible, like the magnetic recording medium. Furthermore, since the identification code can be arbitrarily created, it is highly versatile as a magnetic recording medium. Thus, according to the present invention, the authenticity determination method is easy and reliable, and the forgery and authenticity determination method of the magnetic recording medium capable of reliably preventing falsification, and having such a function,
It is possible to obtain a magnetic recording medium that is easy to manufacture and highly versatile.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing the state of the magnetic recording medium at the time of issuance, FIG. 2 is an explanatory plan view showing the state of the magnetic recording medium inside the terminal, and FIG. 3 is a magnetic diagram when taken out from the terminal. It is a plane explanatory view showing a state of a recording medium. 1 ... Magnetic recording medium, 2 ... Data track 3 ... Identification code, 4 ... Judgment data track 5 ... Data, 6 ... Judgment data, 7 ... Erase pattern

Claims (2)

[Claims] 1. A magnetic recording and reproduction in which a low coercive force magnetic body is formed with a predetermined shape or pattern that can be data for authenticity determination of a data track for magnetically recording data and a magnetic recording medium are difficult or impossible. In a method for judging authenticity of a magnetic recording medium having a track for judging authenticity of a magnetic recording medium having an area, magnetic recording is performed on the track for judging authenticity of the magnetic recording medium, and then in the track for judging genuineness of the magnetic recording medium. It is characterized in that the authenticity of the magnetic recording medium is determined based on data such as the presence / absence of reproduction output, interval, time, or the number of areas, and then magnetically erases the magnetic recording of the magnetic recording medium authenticity determination track. Method for determining authenticity of magnetic recording medium 2. A magnetic recording medium having a magnetic recording data track and a magnetic recording medium authenticity determination track, wherein the magnetic recording medium authenticity determination track can partially serve as authenticity determination data of the magnetic recording medium. A magnetic recording medium having a predetermined shape or pattern formed of a low coercive force magnetic material and having a region in which magnetic recording and reproduction are difficult or impossible.