JP3040111U - Magnetic recording media - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent forgery or falsification of a card by preventing data from being rewritten or erased. A high coercive force magnetic layer (2), a low coercive force magnetic layer (3) on which data that cannot be rewritten and erased is recorded, is formed on an upper surface of a base material (1).
A magnetic recording medium in which a concealing layer 4 is sequentially laminated, and the data is obtained by recording information on the high coercive force magnetic layer 2 after coating and drying with a magnetic head to magnetize the low coercive force magnetic layer 3 during coating. Magnetic recording medium.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a magnetic recording medium provided with a forgery / alteration prevention measure.

[0002]

[Prior art]

 Countermeasures against forgery / alteration in magnetic recording media such as pachinko cards and telephone cards, for example, two types of magnetic layers, high and low, are provided on the card substrate, and dummy data is recorded on the low coercive force magnetic layer to ensure high protection. Technology that protects the true data in the magnetic layer, or technology that hides the magnetic data by using a soft magnetic material, and technology that provides a special pattern on the magnetic layer and reads the data to confirm the authenticity. Etc.

[0003]

[Problems to be solved by the device]

 However, since the magnetic recording medium is capable of rewriting magnetic data due to its nature, data visualized by a special method may be easily duplicated. Further, the technique of providing a special pattern has a drawback that it causes an increase in the manufacturing cost of the medium and the cost of system design, and also has the disadvantage that the special pattern itself cannot be arbitrarily applied to all the mediums.

In other words, a magnetic recording medium having a value similar to that of a cash voucher requires measures to ensure its safety, and at the same time, it is desired that the cost be low. However, in order to meet this requirement, the conventional There was a problem that technology was not enough.

The present invention has been made in view of the above-mentioned prior art, in which data cannot be rewritten or erased, authenticity can be easily and surely identified, and a magnetic field does not lead to cost increase. The purpose is to provide a recording medium.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a magnetic recording medium in which a high-coercive-force magnetic layer, a low-coercive-force magnetic layer in which data that cannot be rewritten and erased is recorded, and a concealment layer are sequentially laminated on the upper surface of a card substrate. The purpose of the present invention is to obtain the above-mentioned arbitrary data that cannot be rewritten and erased by recording information on the high coercive force magnetic layer after coating and drying with a magnetic head to magnetize the low coercive force magnetic layer during coating.

[0007]

[Embodiment of the invention]

 In the present invention, magnetic data that cannot be rewritten and erased is added to each medium in advance.When a medium is used, the process of erasing the magnetic data on the track of the non-rewritable magnetic data with a magnetic head is performed and the data is illegally copied. It is possible to refuse the acceptance of the card.

Further, it is possible to destroy a part of the rewritable and non-erasable data according to the frequency of use, and to make a true / false decision by correlating with the magnetic recording medium, and to make a system for each medium recorded as unique information. With the above management, it is possible to reliably reject multiple uses.

[0009]

【Example】

 As shown in FIG. 1, a high coercive force magnetic layer 2 (unit: 2750 Oersted) made of barium ferrite powder and a binder (polyester resin, curing agent) is applied to a base material 1 made of PET and having a thickness of 188 μ, and dried. To form the first layer. Then, on the magnetic surface, a magnetic head is used to record arbitrary data at a predetermined position, that is, a bit pattern with an appropriate recording current.

After that, a low coercive force magnetic layer 3 (about 300 Oersted) composed of γ-iron oxide powder and a binder is applied and dried on the upper surface of the high-force magnetic layer 2 of the first layer to form the second layer. Form. Then, the data recorded in the first high-magnetic-force magnetic layer 2 is magnetically transferred to the second low-coercive-magnetic layer 3 and is fixed after drying to become unrewritable data. Further, printing is performed on the upper surface of the low coercive force magnetic layer 3 to form the concealing layer 4 as the third layer, and then the die is punched at a predetermined position to obtain a magnetic card.

Whether or not the data recorded in the low coercive force magnetic layer 3 was unchanged was confirmed by the following simple procedure. First, the base material 1 coated with the high coercive force magnetic layer 2 is die-cut into a card size. After that, data is recorded (see FIG. 2) and reproduced (see FIG. 3) by a dynamometer.

The low coercive force magnetic layer 3 is applied to the card after reproduction and dried. At that time, the data recorded in the high coercive force magnetic layer 2 is transferred and fixed to the low coercive force magnetic layer 3. Then, the data fixed to the low coercive force magnetic layer 3 is reproduced (see FIG. 4). A magnet with a strong coercive force is brought close to the sticking data and an attempt is made to erase the data, and then the same data is reproduced again (see Fig. 5). Comparing the data of FIGS. 2 to 5 measured by the above procedure, the result shows the same waveform. That is, an experimental result was obtained in which the data recorded in FIG. 2 was always reproduced as unerasable invariant data.

Therefore, when using the magnetic card manufactured by the above means, first, the authenticity is determined by the presence / absence of unrewritable data (whether the data can be erased) and the correlation between the data destruction status and the magnetic information. It can be carried out. If data is given to the medium and managed on a system (for example, a number from 1 to 100 is assigned), it can be said that used items can be rejected and counterfeiting / alteration becomes impossible.

[0014]

[Effect of the invention]

 According to the present invention, the authenticity of the medium can be easily and surely provided by applying the data that cannot be rewritten and erased, and it exerts a remarkable effect in preventing the forgery and alteration. The above-mentioned non-rewritable data is the data recorded on the high coercive force magnetic layer and fixed on the low coercive force magnetic layer.In manufacturing, the magnetic head recording unit was installed in the existing equipment for magnetic coating. However, there is a real benefit that can be provided online without cost increase.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of the present invention.

FIG. 2 is a waveform diagram of data recorded on a high coercivity magnetic layer.

FIG. 3 is a waveform diagram obtained by reproducing the data of FIG. 2;

FIG. 4 is a reproduction state waveform diagram of data fixed to a low coercive force magnetic layer.

FIG. 5 is a waveform diagram in which the data of FIG. 4 is reproduced after the data is once erased.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 High coercivity magnetic layer 3 Low coercivity magnetic layer 4 Concealment layer

Claims (1)

[Utility model registration claims] 1. A magnetic recording medium in which a high coercive force magnetic layer, a low coercive force magnetic layer recording non-rewritable data, and a concealment layer are sequentially laminated on the upper surface of a base material, and the rewritable and non-erasable optional magnetic recording medium. The data of 1. is obtained by recording information on a high coercive force magnetic layer after coating and drying with a magnetic head so that the low coercive force magnetic layer is magnetized at the time of coating.